WO2018047512A1 - Information processing device, control method therefor, and computer program - Google Patents

Information processing device, control method therefor, and computer program Download PDF

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Publication number
WO2018047512A1
WO2018047512A1 PCT/JP2017/027452 JP2017027452W WO2018047512A1 WO 2018047512 A1 WO2018047512 A1 WO 2018047512A1 JP 2017027452 W JP2017027452 W JP 2017027452W WO 2018047512 A1 WO2018047512 A1 WO 2018047512A1
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WO
WIPO (PCT)
Prior art keywords
push
transmission
instruction
push transmission
segment
Prior art date
Application number
PCT/JP2017/027452
Other languages
French (fr)
Japanese (ja)
Inventor
誠実 鈴木
智哉 酒井
Original Assignee
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017063750A external-priority patent/JP2018045674A/en
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Priority to CN201780055212.1A priority Critical patent/CN109690507A/en
Publication of WO2018047512A1 publication Critical patent/WO2018047512A1/en
Priority to US16/292,117 priority patent/US20190199814A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/239—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests

Definitions

  • the present invention relates to an information processing apparatus, a control method thereof, and a computer program, and more particularly, to a content push technique.
  • a distribution system for distributing content in a streaming format composed of audio data, video data, and the like to users in real time has been provided.
  • the user can enjoy desired content such as live video in real time via his / her terminal device.
  • DASH Dynamic Adaptive Streaming over HTTP.
  • video data is divided into small time unit segments, and a URL (Uniform Resource Locator) for acquiring the segments is described in a file called a playlist.
  • the receiving apparatus first acquires this playlist, and acquires desired video data using information described in the playlist.
  • URLs for a plurality of versions of video data segments in the playlist the receiving apparatus can acquire an optimal version of the video data segments according to its own processing capability and communication environment.
  • These streaming systems have a function of PUSH (push) transmission of a data segment from a transmission device. Since the PUSH transmission can transmit a corresponding response prior to the reception of the request even if there is no request from the receiving apparatus, it is possible to reduce the video reproduction delay.
  • PUSH push
  • Patent Document 1 describes a configuration in which media is switched at high speed by distributing media by PUSH transmission in response to a request for switching media in media distribution using MPEG-DASH.
  • a server device has the following configuration. That is, Receiving means for receiving, from the client device, a push transmission instruction regarding the media segment into which the content data is divided; A transmission unit that push-transmits a media segment corresponding to the push transmission instruction received by the reception unit to the client device; Among the media segments according to the push transmission instruction received by the receiving means, the push cancel instruction including identification information used for the server device to identify a media segment whose push transmission by the transmitting means is canceled Control means for canceling push transmission by the transmission means of the media segment specified based on the identification information when received from the client device.
  • FIG. 1 is a system configuration diagram of a communication system.
  • FIG. 2 is a block diagram illustrating a functional configuration example of the transmission apparatus.
  • FIG. 3 is a block diagram illustrating a functional configuration example of the receiving apparatus.
  • FIG. 4 is a block diagram illustrating a hardware configuration example of the transmission apparatus.
  • FIG. 5 is a block diagram illustrating a hardware configuration example of the receiving apparatus.
  • FIG. 6 is a flowchart showing an operation procedure of the transmission apparatus.
  • FIG. 7 is a flowchart showing an operation procedure of the receiving apparatus.
  • FIG. 8A is a diagram illustrating an example of a cancellation method.
  • FIG. 8B is a diagram illustrating an example of a cancellation method.
  • FIG. 9A is a diagram illustrating an example of a cancellation method.
  • FIG. 9A is a diagram illustrating an example of a cancellation method.
  • FIG. 9B is a diagram illustrating an example of a cancellation method.
  • FIG. 10A is a diagram illustrating an example of a cancellation method.
  • FIG. 10B is a diagram illustrating an example of a cancellation method.
  • FIG. 11A is a diagram illustrating an example of a cancellation method.
  • FIG. 11B is a diagram illustrating an example of a cancellation method.
  • FIG. 11C is a diagram illustrating an example of a cancellation method.
  • FIG. 12A is a diagram illustrating an example of a cancellation method.
  • FIG. 12B is a diagram illustrating an example of a cancellation method.
  • FIG. 12C is a diagram illustrating an example of a cancellation method.
  • FIG. 13A is a diagram illustrating an example of a cancellation method.
  • FIG. 13A is a diagram illustrating an example of a cancellation method.
  • FIG. 13B is a diagram illustrating an example of a cancellation method.
  • FIG. 13C is a diagram illustrating an example of a cancellation method.
  • FIG. 14A is a diagram illustrating an example of a cancellation method.
  • FIG. 14B is a diagram illustrating an example of a cancellation method.
  • FIG. 15A is a diagram illustrating an example of a cancellation method.
  • FIG. 15B is a diagram illustrating an example of a cancellation method.
  • FIG. 15C is a diagram illustrating an example of a cancellation method.
  • FIG. 16 is a diagram illustrating an example of a cancellation method.
  • FIG. 17A is a diagram illustrating an example of a cancellation method.
  • FIG. 17B is a diagram illustrating an example of a cancellation method.
  • FIG. 1 is a diagram showing an overall configuration of a communication system according to an embodiment of the present invention.
  • the transmission apparatus 101 according to the present embodiment is connected to the reception apparatus 102 via the network 103.
  • a plurality of transmission apparatuses 101 and reception apparatuses 102 may exist.
  • the transmission device 101 is, for example, a server device, and the reception device 102 is, for example, a client device.
  • the transmission apparatus 101 has a content transmission function for pushing content data divided into segments to the reception apparatus 102.
  • the segment includes an initial segment (initialization segment) describing parameters used for content reproduction and a media segment describing content data.
  • the transmission apparatus 101 may further have a function of receiving input from the user.
  • Specific examples of the transmission device 101 include information processing devices such as a camera device, a video camera device, a smart phone device, a PC (personal computer) device, and a mobile phone. It is not limited to.
  • the receiving device 102 has a content reproduction / display function and a communication function, and receives a segment of content data push-transmitted from the transmitting device 101.
  • the receiving device 102 may further have a function of receiving input from the user.
  • Specific examples of the receiving device 102 include information processing devices such as a smart phone device, a PC device, a television, and a mobile phone, but are not limited thereto as long as they satisfy the above-described functional configuration.
  • the network 103 is a wired LAN (Local Area Network) or a wireless LAN (Wireless LAN) as a network in the present embodiment.
  • a wired LAN or a wireless LAN is used as the network 103.
  • the present invention is not limited to this, and a WAN (Wide Area Network), a PAN (Personal Area Network), or the like may be used.
  • the network 103 may be one that passes through a public communication network such as the Internet.
  • FIG. 2 is a block diagram illustrating a functional configuration example of the transmission apparatus according to the present embodiment.
  • the transmission apparatus 101 according to the present embodiment includes an imaging unit 201, an encoding unit 202, a segment generation unit 203, a playlist generation unit 204, a segment determination unit 205, an instruction management unit 206, and a communication unit 207.
  • the image capturing unit 201 captures a subject to acquire video data.
  • the encoding unit 202 encodes video data captured by the imaging unit 201.
  • the imaging unit 201 and the encoding unit 202 may be provided outside the transmission apparatus 101, and the encoded video data may be provided to the transmission apparatus 101.
  • the video data is not only a moving image but also data including sound.
  • the content to be transmitted / received is not only such video data but also an image including a still image, text data, or an image including a program code executed in the receiving device 102 such as Javascript (registered trademark). Good.
  • the segment generation unit 203 generates a segment, which is a transmission unit of video data, from the video data encoded by the encoding unit 202.
  • a segment is a unit of video data obtained by dividing video data spatially or temporally.
  • ISOBMFF Basic Media File Format
  • the playlist generation unit 204 generates a playlist that describes a URL that allows access to the segment created by the segment generation unit 203.
  • MPD Media Presentation Description
  • MPEG-DASH Media Presentation Description
  • the present invention is not limited to this, and it may have a function equivalent to this, such as a description method of a playlist in Http Livestreaming.
  • the communication unit 207 transmits the generated playlist and segment to the receiving apparatus 102 via the network 103 in response to a request from the receiving apparatus 102.
  • An instruction management unit (PUSH transmission instruction management unit) 206 holds the PUSH transmission instruction received by the communication unit 207 from the receiving apparatus 102 and transmits the content of the PUSH (push) transmission instruction to the segment determination unit 205.
  • a segment determination unit (transmission segment determination unit) 205 determines a segment to be transmitted when the communication unit 207 receives a segment acquisition request. Further, the segment determination unit 205 determines a segment to perform PUSH transmission based on the content of the PUSH transmission instruction received from the instruction management unit 206.
  • FIG. 3 is a block diagram illustrating a functional configuration of the receiving apparatus according to the present embodiment.
  • the receiving apparatus 102 according to the present embodiment includes a display unit 301, a decoding unit 302, a playlist analysis unit 303, a buffer 304, a user interface unit 305, an instruction management unit 306, a segment determination unit 307, and a communication unit 308.
  • the communication unit 308 receives a segment and a playlist from the transmission apparatus 101 via the network 103, passes the segment to the buffer 304, and passes the playlist to the playlist analysis unit 303.
  • the buffer 304 accumulates the segments passed from the communication unit 308 and temporarily holds them.
  • the decoding unit 302 decodes the video data based on the segments accumulated in the buffer 304.
  • the display unit 301 displays a playback image of video data received from the transmission device 101 via the network 103 and decoded by the decoding unit 302, or outputs audio. Note that the display unit 301 may be external to the receiving device 102 and receive and display video data from the receiving device 102.
  • the playlist analysis unit 303 analyzes the playlist passed from the communication unit 308.
  • the user interface unit 305 inputs an instruction from the user by displaying a screen for the user to operate on the display 508. For example, a list of videos that can be acquired based on a playlist received from the transmission apparatus 101 is displayed, and a selection from the user is accepted, or an instruction to pause or cancel playback is accepted.
  • the segment determination unit (acquisition segment determination unit) 307 determines a segment to be acquired based on the analysis result from the playlist analysis unit 303 based on the input from the user interface unit 305.
  • the present invention is not limited to this, and other methods such as segment determination according to the status of the network 103 may be used.
  • the instruction management unit (PUSH transmission instruction management unit) 306 transmits a PUSH transmission instruction via the communication unit 308 based on the analysis result from the playlist analysis unit 303, and manages the transmitted PUSH transmission instruction.
  • the instruction management unit 306 may transmit the PUSH transmission instruction without referring to the analysis result of the playlist analysis unit 303, or may transmit the PUSH transmission instruction before acquiring the playlist.
  • the instruction management unit 306 transmits a PUSH transmission instruction based on an input from the user interface unit 305.
  • the instruction management unit 306 is not limited to this, and other methods such as performing according to the state of the network 103 may be used.
  • FIG. 4 is a block diagram illustrating a hardware configuration of the transmission apparatus 101 according to the present embodiment.
  • a central processing unit (hereinafter referred to as a CPU) 401 is a device that controls the entire device and calculates and processes data.
  • the CPU 401 loads and executes a computer program stored in a ROM 402 described later on a RAM 403 described later.
  • the CPU 401 controls the entire apparatus based on a computer program, thereby realizing an encoding unit 202, a segment generation unit 203, a playlist generation unit 204, a segment determination unit 205, and an instruction management unit 206.
  • ROM 402 is a read-only memory, and is a storage device for reading information once written. In the present embodiment, the ROM 402 stores a computer program for each functional unit shown in FIG.
  • a RAM 403 is a writable memory and is a storage device for temporarily writing and reading data. The RAM 403 stores temporary values for each program.
  • the internal memory 404 and the external memory 405 are external storage devices that store application contents.
  • the built-in memory 404 is a built-in storage device such as an SSD (solid state drive) or a hard disk.
  • the external memory 405 is a removable memory device such as a flash memory represented by a USB memory, an SD memory, or the like. 2 may be stored not in the ROM 402 but in the RAM 403, the built-in memory 404, or the external memory 405.
  • the input device 406 is a device for inputting an instruction from the user.
  • the input device 406 may include a power button, a volume button, a home button, and the like implemented by mechanical button switches, or may be implemented by a touch panel, a keyboard, a pointing device, or the like.
  • a plurality of input devices 406 can be mounted on the transmission device 101.
  • the network I / F 407 is a device for transmitting and receiving data via the network 103.
  • the network I / F 407 implements the communication unit 207.
  • the power source 408 is a device that supplies / charges power to the transmission device 101, and includes a battery and a charging device.
  • the power source 408 may be realized by an AC adapter.
  • the camera 409 is a device that captures content for transmission, and realizes the imaging unit 201.
  • FIG. 5 is a block diagram illustrating a hardware configuration of the receiving apparatus 102 according to the present embodiment.
  • a central processing unit (hereinafter referred to as a CPU) 501 is a device that controls the entire apparatus to calculate and process data.
  • the CPU 501 develops and executes a computer program stored in a ROM 502 described later on a RAM 503 described later.
  • the CPU 501 controls the entire apparatus based on a computer program, thereby realizing a decryption unit 302, a playlist analysis unit 303, an instruction management unit 306, and a segment determination unit 307.
  • ROM 502 is a read-only memory, and is a storage device for reading information once written. In the present embodiment, the ROM 502 stores a computer program for each functional unit shown in FIG.
  • a RAM 503 is a writable memory and is a storage device for temporarily writing and reading data. The RAM 503 stores temporary values for each program.
  • the internal memory 504 and the external memory 506 are external storage devices that store application contents. These devices implement a buffer 304. Note that the buffer 304 may be realized by the RAM 503. Specific examples of the internal memory 504 and the external memory 506 are the same as the internal memory 404 and the external memory 405 of the transmission apparatus 101 described with reference to FIG.
  • the input device 505 is a device for inputting an instruction from the user.
  • the input device 505 may be a power button, a volume button, a home button, or the like mounted by a mechanical button switch, or may be mounted by a touch panel, a keyboard, a pointing device, or the like.
  • a plurality of input devices 505 can be mounted on the receiving device 102.
  • the input device 505 implements a user interface unit 305.
  • the speaker 507 and the display 508 are devices that reproduce the content received from the transmission device 101, and realize the display unit 301. That is, the speaker 507 outputs audio data included in the received content as audio.
  • the display 508 displays moving image data included in the received content as an image.
  • a network I / F 509 is a device for transmitting and receiving data via a network.
  • a network I / F 509 is a device that implements the communication unit 308.
  • the power source 510 is a device that supplies / charges power to the receiving device 102 and includes a battery and a charging device.
  • the power source 510 may be realized by an AC adapter.
  • FIG. 6 is a flowchart showing a procedure of processing performed by the transmission apparatus 101 according to the present embodiment from when a PUSH transmission instruction is received until PUSH transmission is canceled. Each step in FIG. 6 is executed by the CPU 401 controlling the transmission apparatus 101 based on the computer program.
  • the communication unit 207 receives a PUSH transmission instruction from the receiving device 102.
  • one PUSH transmission instruction may be received, or a plurality of PUSH transmission instructions may be received simultaneously.
  • the instruction management unit 206 allocates an identifier for distinguishing each received PUSH transmission instruction.
  • This identifier may be a number or a character string, or may be in the form of a URL (Uniform Resource Locator).
  • a value representing the type of segment data such as video or audio may be used as an identifier.
  • the instruction management unit 206 may skip S602 and use the identifier allocated by the receiving apparatus 102 as it is. Further, when the segment data type is used as an identifier, S602 may be skipped because there is no need to newly allocate an identifier. Also, S602 may be skipped when the PUSH transmission instruction is distinguished by other than the identifier.
  • the PUSH transmission instruction may be distinguished by the time when the reception apparatus 102 transmits the PUSH transmission instruction, or the time when the transmission apparatus 101 transmits a response to the PUSH transmission instruction in S603 described later.
  • the receiving apparatus 102 may distinguish the acquired resources together with the PUSH transmission instruction. For example, in HTTP / 2, a resource is a segment name obtained when a PUSH transmission instruction is issued. Moreover, you may implement by the method which can distinguish and manage a PUSH transmission instruction
  • the communication unit 207 transmits a response to the PUSH transmission instruction.
  • the response is transmitted including the identifier.
  • the communication unit 207 transmits a response including a value necessary to distinguish the PUSH transmission instruction.
  • the playlist generating unit 204 may notify the receiving apparatus 102 by describing each value in the MPD.
  • the instruction management unit 206 holds the received PUSH transmission instruction.
  • the PUSH transmission instruction and the identifier are associated and held.
  • S604 may be skipped if the data type is known from the segment name.
  • the PUSH transmission instruction is held in association with a value for distinguishing the PUSH transmission instruction.
  • the segment determination unit 205 determines a segment to be PUSH transmitted based on the content of the received PUSH transmission instruction, and notifies the instruction management unit 206 of the determined segment list. Thereafter, the communication unit 207 performs PUSH transmission of the target segment. In the case of live distribution, PUSH transmission is performed from the PUSH target segment that has been generated. Note that S603, S604, and S605 may be performed in an order different from the flowchart.
  • the communication unit 207 receives a PUSH transmission cancel instruction from the receiving device 102.
  • the PUSH transmission cancel instruction received here may be directed to one PUSH transmission instruction, or may be directed to a plurality of PUSH transmission instructions.
  • the PUSH transmission cancel instruction may be a content instructing cancellation of all segments scheduled to be pushed by the PUSH transmission instruction, or may be content instructing cancellation of only a part of the segments to be pushed by the PUSH transmission instruction. .
  • the processes from S607 to S610 are performed in order for each segment to be canceled among the segments to be PUSH transmitted based on the PUSH transmission instruction. Cancellation candidates will be described later in the description of S607. Further, when there are a plurality of PUSH transmission instructions for PUSH cancellation, the processing from S607 to S611 is performed for each PUSH transmission instruction. For example, PUSH transmission instruction A and B are subject to PUSH transmission cancellation instructions, and there are two cancellation candidate segments for PUSH transmission instruction A and three cancellation candidate segments for B. In this case, first, the process from S607 to S611 is executed for A which is one of the target PUSH transmission instructions.
  • S607 to S610 for the number of cancel candidate segments, which are twice, are performed in order.
  • S607 to S611 are executed for the PUSH transmission instruction B that is another cancellation target.
  • S607 to S610 for three times that are the number of cancel candidate segments are sequentially performed. The processing for each segment from S607 to S610 may be performed in parallel for each PUSH transmission instruction to be canceled.
  • the instruction management unit 206 identifies one segment that is a cancel candidate from among the PUSH transmission instructions targeted by the PUSH transmission cancellation instruction, from among the segments to be pushed by one PUSH transmission instruction. For example, it is assumed that PUSH transmission is to be performed for segment1, segment2, and segment3 according to a certain PUSH transmission instruction. Assume that the PUSH transmission cancel instruction asks to cancel all segments. In this case, the cancellation candidate segments are all three segments, segment1, segment2, and segment3, and in step S607, the instruction management unit 206 selects one of them (for example, segment1). On the other hand, when the PUSH transmission cancellation instruction is only the last segment, the cancellation candidate segment is only segment3, and segment3 is inevitably selected.
  • PUSH transmission cancellation targets are segment1 to segment3, segment1 has been transmitted, and segment2 has been cancelled, only segment3 is a candidate for PUSH transmission cancellation.
  • the instruction management unit 206 confirms that the cancel candidate segment specified in S607 is not a PUSH transmission target according to another PUSH transmission instruction.
  • segment1, segment2, and segment3 are to be PUSH-transmitted according to a certain PUSH transmission instruction (hereinafter referred to as “instruction 1”).
  • instruction 1 it is assumed that one of the cancel candidate segments according to the PUSH transmission cancel instruction is segment3.
  • instruction 2 it is assumed that the PUSH transmission scheduled segments based on another PUSH transmission instruction (hereinafter referred to as “instruction 2”) are segment3 and segment4.
  • segment 3 since segment 3 is scheduled to be PUSH transmitted according to instruction 2, the PUSH transmission of segment 3 must not be canceled in the process of instruction 1. If no other PUSH transmission instruction is instructed from the receiving apparatus 102 other than the PUSH transmission instruction to be canceled, S608 may be skipped and the process may proceed to S609.
  • step S609 the instruction management unit 206 instructs the segment determination unit 205 to cancel the PUSH transmission of the cancel candidate segment.
  • the segment determination unit 205 cancels the PUSH transmission of the cancel candidate segment.
  • S610 it is determined whether or not the processing from S608 to S609 has been performed for all cancel candidate segments for one PUSH transmission instruction to be processed. If it is determined that the processing from S608 to S609 has been performed for all cancel candidate segments (YES in S610), the process proceeds to S611. If it is determined in S610 that the processing from S608 to S609 has not been performed for all the cancellation candidate segments (NO in S610), the process proceeds to S607 and the above-described cancellation is performed for the cancellation candidate segment that has not been processed. Process.
  • S607 to S610 The processing from S607 to S610 is performed for each cancel candidate segment among the segments to be PUSH transmitted by one PUSH transmission instruction. Note that in S607, all cancel candidate segments of all PUSH transmission instructions may be specified first, and then S608 to S610 may be performed for each specified cancel candidate segment.
  • S611 it is determined whether or not the processing from S607 to S610 has been performed for all PUSH transmission instructions instructing cancellation of PUSH transmission. If it is determined that the cancellation processing from S607 to S610 has been performed for all PUSH transmission instructions that are to be canceled (YES in S611), the processing proceeds to S612. If it is determined that the cancellation process from S607 to S610 has not been performed for all the PUSH transmission instructions (NO in S611), the process proceeds to S607 and the above-described cancellation process is performed for an unprocessed PUSH transmission instruction.
  • the cancellation method from S607 to S611 is not limited to the method described in this description. For example, regardless of whether a segment is a PUSH transmission target from another PUSH transmission instruction, when a certain PUSH transmission instruction is canceled, another method such as canceling the PUSH transmission of that segment is used. It may be used.
  • the communication unit 207 transmits a response to the PUSH transmission cancel instruction to the receiving apparatus 102.
  • FIG. 7 is a flowchart showing a procedure of processing performed by the receiving apparatus 102 according to the present embodiment until transmission of a PUSH transmission instruction and subsequent cancellation of PUSH transmission. Each step in FIG. 7 is executed by the CPU 501 controlling the receiving apparatus 102 based on the computer program.
  • the instruction management unit 306 allocates an identifier for distinguishing each PUSH transmission instruction to be transmitted.
  • This identifier may be a number, a character string, or the like, or may be in the form of a URL.
  • a value representing the type of segment data such as video or audio may be used as an identifier.
  • S701 may be skipped if the data type is known from the segment name.
  • This identifier can also be allocated by the transmission apparatus 101, and in this case, S701 may be skipped. Further, S701 may be skipped when the PUSH transmission instruction is distinguished by other than the identifier.
  • step S ⁇ b> 702 the communication unit 308 transmits a PUSH transmission instruction to the transmission apparatus 101.
  • One PUSH transmission instruction may be transmitted here, or a plurality of PUSH transmission instructions may be transmitted simultaneously.
  • the identifier is waved in S701, the identifier is included in each PUSH transmission instruction and transmitted.
  • the communication unit 308 receives a response from the transmission apparatus 101 to the PUSH transmission instruction. This response is transmitted from the transmission apparatus 101 in step S603 of FIG.
  • step S704 the instruction management unit 306 holds the PUSH transmission instruction response received from the transmission apparatus 101.
  • step S ⁇ b> 705 the communication unit 308 receives a segment transmitted by PUSH from the transmission apparatus 101.
  • the received segment is stored in the buffer 304, decoded by the decoding unit 302, and displayed / output by the display unit 301.
  • the communication unit 308 transmits a PUSH transmission cancel instruction. This step may be executed before receiving the PUSH transmission segment in S705.
  • the PUSH transmission cancel instruction to be transmitted may be one PUSH transmission instruction or a plurality of PUSH transmission instructions.
  • the PUSH transmission cancel instruction may be a content instructing cancellation of all the segments scheduled to be pushed by the PUSH transmission instruction. Or the content which instruct
  • the transmission trigger of the PUSH transmission cancel instruction in S706 may be an instruction by the user, a state change of a band of a communication path connecting the transmission apparatus 101 and the reception apparatus 102, or the transmission apparatus 101 and / or the reception apparatus. A change in the state of 102 may be used.
  • the PUSH transmission cancel instruction may be included in a header of a message from a web browser executed in the receiving apparatus 102, or may be included in a message from an application different from the web browser. .
  • the PUSH transmission cancel instruction transmitted by the communication unit 308 includes designation of the PUSH transmission instruction. As described in the description of S602, this designation may be realized using an identifier assigned to the PUSH transmission instruction, or may be realized using time information.
  • the time information may be the time at which the receiving apparatus 102 transmits the PUSH transmission instruction, the time at which the transmitting apparatus 101 transmits a response to the PUSH transmission instruction, or information about other times may be used. .
  • the above specification is realized based on information for identifying the type of data (video data, audio data, or other data) to be push-transmitted by the PUSH transmission instruction. May be.
  • a PUSH transmission cancellation instruction that specifies a media segment to be subjected to push transmission may be transmitted by the communication unit 308.
  • a URL may be used for specifying a PUSH transmission instruction and a media segment.
  • the communication unit 308 identifies identification information (for example, an identifier of a PUSH transmission instruction, time information, a data type, or a PUSH transmission for specifying a media segment for which push transmission should be canceled).
  • An instruction or a URL for designating a media segment is included in the PUSH transmission cancel instruction and transmitted.
  • the communication unit 308 receives a response to the PUSH transmission cancel instruction. This response is transmitted from the transmission apparatus 101 in step S612 of FIG.
  • the transmission apparatus 101 when the transmission apparatus 101 receives a push transmission instruction for instructing push transmission of at least one segment from the reception apparatus 102, the transmission apparatus 101 is controlled to push each segment to the reception apparatus 102 accordingly. To do.
  • the transmitting apparatus 101 receives a cancel instruction including the designation of the push transmission instruction for canceling the push transmission of the segment from the receiving apparatus 102, the transmitting apparatus 101 stops the push transmission of the untransmitted segment based on the designated push transmission instruction. To do.
  • the push transmission can be canceled with the minimum number of transactions regardless of the communication protocol used such as HTTP / 2 or WebSocket. Is possible.
  • the designation of the push transmission instruction is performed by, for example, combining the identifier of the push transmission instruction or the content of the push transmission instruction with the resource requested by the receiving apparatus 102 or the time related to transmission / reception of the push transmission instruction. It can be carried out. Further, the transmission apparatus 101 stops the push transmission of all or a part of the untransmitted segments according to the content of the received cancellation instruction, so that the reception apparatus 102 cancels the transmission of the desired segment later. can do.
  • the transmission apparatus 101 when the transmission apparatus 101 receives a plurality of push transmission instructions and pushes a segment and receives a cancel instruction for a certain push transmission instruction, in S608, the transmission apparatus 101 transmits another push transmission instruction.
  • the transmission apparatus 101 transmits another push transmission instruction.
  • FIGS. 8A and 8B are schematic diagrams illustrating examples of requests and response messages exchanged between the transmission apparatus 101 and the reception apparatus 102.
  • FIG. data transmitted from the receiving apparatus 102 to the transmitting apparatus 101 is referred to as a request, and data transmitted from the transmitting apparatus 101 to the receiving apparatus 102 is referred to as a response.
  • the messages are exchanged in order from the upper message in FIG. 8A to the lower message, and then the lower message is exchanged from the upper message in FIG. 8B.
  • FIGS. 9A to 17B have the same configuration.
  • the identifier is assigned by the transmission apparatus 101, and step S701 is skipped.
  • the communication unit 308 of the reception apparatus 102 transmits a request 801 including the PUSH transmission instruction 802 in the accept-push-policy header to the transmission apparatus 101.
  • the request 801 has a content for requesting a segment called segmentA1.
  • the request 801 further instructs the PUSH transmission instruction 802 to PUSH transmit the next five segments segmentA2 to segmentA6 continuous from the segmentA1 in terms of playback time.
  • the number “5” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / tmp / segmentA1”.
  • the communication unit 207 of the transmission apparatus 101 receives a request 801 including a PUSH transmission instruction 802.
  • the instruction management unit 206 of the transmission device 101 allocates an identifier 805 of “/ example / tmp / push1” to the received PUSH transmission instruction 802.
  • the identifier adopts the URL format.
  • step S ⁇ b> 603 the communication unit 207 of the transmission apparatus 101 transmits, to the reception apparatus 102, a response 803 including a PUSH transmission instruction response 804 having the same content as the PUSH transmission instruction 802 in the push-policy header as a response to the PUSH transmission instruction 802. .
  • the push-policy header of the response 803 includes an identifier 805 in association with the PUSH transmission instruction response 804.
  • a prefix “push-URL” in front of the identifier 805
  • the transmitting apparatus 101 may describe the identifier 805 in the MPD and notify the receiving apparatus 102.
  • the transmission apparatus 101 transmits PUSH_PROMISE 806 and 807 for reserving which stream to transmit for segment A2 and segment A3 scheduled for PUSH transmission in HTTP / 2.
  • the receiving apparatus 102 receives this.
  • PUSH_PROMISE 806 and 807 may be exchanged before the response 803. It is assumed that PUSH_PROMISE corresponding to the segment (segment A4, segment A5, segment A6) after segment A3 is not transmitted.
  • PUSH_PROMISE when the generation of the corresponding segment is not completed, or when the upper limit number that can be reserved for transmission has been reached at the same time, PUSH_PROMISE is not transmitted. Besides this case, PUSH_PROMISE may not be transmitted.
  • the instruction management unit 206 of the transmission apparatus 101 holds the received PUSH transmission instruction 802 and the identifier 805 in association with each other.
  • the communication unit 308 of the reception apparatus 102 receives the response 804 including the PUSH transmission instruction 802 response 804 and the segment A1 binary data.
  • the instruction management unit 306 of the reception apparatus 102 holds the PUSH transmission instruction 802 accepted by the transmission apparatus 101 in association with the identifier 805.
  • the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 808 to the reception apparatus 102 as the PUSH transmission of the segment A2.
  • the numerical values at the end of the segment names are continuous, it is assumed that they are continuous in terms of playback time. For example, segment A2 and segment A3 have a continuous playback time, and the video at the end of segment A2 is continuous with the video at the beginning of segment A3.
  • the communication unit 308 of the receiving apparatus 102 receives the response 808 including the binary data of segmentA2.
  • the communication unit 308 of the reception apparatus 102 transmits the request 809 including the PUSH transmission cancel instruction 810 in the accept-push-policy header.
  • the PUSH transmission cancel instruction 810 has a content for canceling all segments scheduled to be PUSH transmitted by the PUSH transmission instruction 802.
  • the identifier 805 may be included in the accept-push-policy header together with the prefix “push-URL”. This prefix is not limited to “push-URL”.
  • the communication unit 207 of the transmission apparatus 101 receives the request 809 including the PUSH transmission cancel instruction 810.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A ⁇ b> 3 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 to be canceled determined from the identifier 805.
  • the PUSH transmission of segment A2 to segment A6 is requested by the PUSH transmission instruction 802.
  • segment A3 having the smallest serial number among untransmitted segments is identified as a cancel candidate.
  • the instruction management unit 206 of the transmission device 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3.
  • transmission reservation by PUSH_PROMISE 807 since transmission reservation by PUSH_PROMISE 807 has already been completed, transmission of RST_STREAM 813 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • S610 it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 according to the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A ⁇ b> 4 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 to be canceled determined from the identifier 805.
  • the instruction management unit 206 of the transmission device 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A4, and the segment determination unit 205 cancels the PUSH transmission of the segment A4.
  • the segment determination unit 205 cancels the PUSH transmission of the segment A4.
  • S610 it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 according to the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A5 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 that is the cancellation target determined from the identifier 805.
  • step S609 the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A5, and the segment determination unit 205 cancels the PUSH transmission of the segment A5.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A5, and the segment determination unit 205 cancels the PUSH transmission of the segment A5.
  • a specific canceling process only the process of stopping the PUSH transmission is performed inside the transmitting apparatus 101. Since the segment A5 is not reserved for transmission, only the stop process inside the transmission apparatus 101 is required.
  • S610 it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 by the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A6 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 that is the cancellation target determined from the identifier 805.
  • step S609 the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A6, and the segment determination unit 205 cancels the PUSH transmission of the segment A6.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A6, and the segment determination unit 205 cancels the PUSH transmission of the segment A6.
  • the process of stopping the PUSH transmission is performed inside the transmitting apparatus 101. Since the transmission reservation of segment A6 is not performed, only the stop process inside the transmission apparatus 101 is sufficient.
  • S610 it is determined that cancellation is possible for all cancel candidate segments in the PUSH transmission instruction 802 by the PUSH transmission cancellation instruction 810 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 811 including a response 812 to the PUSH transmission cancel instruction 810 in the push-policy header to the reception apparatus 102.
  • This response has the same content as the PUSH transmission cancel instruction 810.
  • the communication unit 308 of the receiving apparatus 102 receives the response 811 including the PUSH transmission cancel instruction response 812.
  • the transmitting apparatus 101 has already transmitted PUSH_PROMISE 807 to the receiving apparatus 102 for the canceled segment A3.
  • the transmitting apparatus 101 transmits RST_STREAM 813 to cancel this, and the receiving apparatus 102 receives it.
  • This RST_STREAM 813 may be transmitted by the receiving apparatus 102 before S706 or after S707.
  • HTTP2 in order to cancel a part of a plurality of push-policies or a part of a plurality of PUSH-scheduled segments based on the push-policy, it is necessary to cancel all the PUSHs once and then make necessary settings again. There is.
  • the stream ID is notified by PUSH_PROMISE for each PUSH target segment, and PUSH of an arbitrary segment can be canceled by specifying it.
  • PUSH_PROMISE is transmitted with a delay or when the segment name to be canceled by the client is unknown, it is necessary to exchange a plurality of commands, which may cause a delay due to an increase in transactions.
  • the transmission apparatus 101 notifies the reception apparatus 102 of the identifier 805 in the URL format of the PUSH transmission instruction, so that the reception apparatus 102 specifies the cancellation target by the identifier 805 and cancels the cancellation. Can be directed. Therefore, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
  • 901 to 902 are the same as 801 to 802. Also, the processing of S601 in FIG. 6 and S701 to S702 in FIG. 7 is the same as that described with reference to FIGS.
  • step S ⁇ b> 602 the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 905 “push1” to the PUSH transmission instruction 902 received from the reception apparatus 102.
  • 9A and 9B show an example in which a character string format is adopted as an identifier.
  • step S ⁇ b> 603 the communication unit 207 of the transmission apparatus 101 transmits, as a response to the push transmission instruction 902, a response 903 including a push transmission policy response 904 having the same content as the push transmission instruction 902 to the reception apparatus 102. .
  • the response 903 also includes the binary data of segmentA1.
  • the push-policy header of the response 903 includes an identifier 905 in association with the PUSH transmission instruction response 804. Note that a prefix “push-ID” is inserted before the identifier 905 so that the identifier 905 can be identified from where in the push-policy header. This prefix is not limited to “push-ID”. Instead of transmitting the identifier 905 together with the PUSH transmission instruction response 904, when receiving an MPD acquisition request from the receiving apparatus 102, the transmitting apparatus 101 may describe the identifier 905 in the MPD and notify the receiving apparatus 102.
  • 906 to 908 are the same as 806 to 808.
  • the processing in S604 to S605 in FIG. 6 and the processing in S703 to S705 in FIG. 7 is the same as the PUSH transmission processing described with reference to FIGS.
  • the communication unit 308 of the reception apparatus 102 transmits a request 909 including the PUSH transmission cancel instruction 911 in the accept-push-policy header to the transmission apparatus 101.
  • the PUSH transmission cancel instruction 911 is a content for canceling all the segments scheduled to be PUSH transmitted by the PUSH transmission instruction 902.
  • the PUSH transmission instruction 902 to be canceled can be designated.
  • the URL 910 specified in the path of the request 909 specifies what is shared between the transmitting apparatus 101 and the receiving apparatus 102 in advance by describing it in the MPD.
  • 912 to 914 are the same as 811 to 813.
  • the processing from S606 to S612 in FIG. 6 and S707 in FIG. 7 is the same as the content described with reference to FIGS.
  • the transmission apparatus 101 notifies the reception apparatus 102 of the identifier 905 in the character string format of the PUSH transmission instruction, so that the reception apparatus 102 can specify the cancellation target by the identifier 905 and instruct the cancellation. it can. Therefore, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
  • FIGS. 10A and 10B show an example in which all segments scheduled to be pushed by a PUSH transmission instruction are canceled.
  • 10A and 10B are the same as 801 and 802 in FIGS. 8A and 8B. Also, the processing in S601 of FIG. 6 and S701 to S702 of FIG. 7 is the same as the processing described with reference to FIGS.
  • a PUSH transmission cancel instruction is performed by combining the contents of the PUSH transmission instruction and the resources acquired when the PUSH transmission instruction is transmitted. For this reason, S602 in which the transmission apparatus 101 allocates an identifier to the PUSH transmission instruction is skipped.
  • the resource is “segment A1” (resource 1002) that is a GET target in the request 1001.
  • step S ⁇ b> 603 the communication unit 207 of the transmission apparatus 101 returns a response 1004 including a response to the PUSH transmission instruction 1003 to the reception apparatus 102.
  • the response 1004 includes a PUSH transmission instruction response 1005 having the same content as the PUSH transmission instruction 1003 in the push-policy header. Further, the response 1004 includes the binary data of segmentA1. Unlike the operation example described with reference to FIGS. 8A and 8B and FIGS. 9A and 9B, the response 1004 does not include the identifier of the PUSH transmission instruction.
  • 1006 to 1008 are the same as 806 to 808 in FIGS. 8A and 8B. Further, the processing from S604 to S605 in FIG. 6 and the processing from S703 to S705 in FIG. 7 are the same as the PUSH transmission processing described with reference to FIGS.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1009 including the PUSH transmission cancel instruction 1010 in the accept-push-policy header to the transmission apparatus 101.
  • the content of the PUSH transmission cancel instruction 1010 is to cancel all the segments scheduled to be PUSH transmitted by the PUSH transmission instruction 1003.
  • the segment A1 (resource 1002) that has been a GET target in the request 1001 is included in the path header, and the contents of the PUSH transmission instruction 1003 are included in the accept-push-policy header.
  • a PUSH transmission instruction 1003 to be canceled is designated.
  • 1011 to 1013 are the same as 811 to 813 in FIGS. 8A and 8B. Also, the processing from S606 to S612 in FIG. 6 and the processing in S707 in FIG. 7 are the same as the processing described with reference to FIGS.
  • the receiving apparatus 102 designates a PUSH transmission instruction to be canceled based on a combination of resources acquired when the content of the PUSH transmission instruction and the PUSH transmission instruction are transmitted.
  • the cancellation can be instructed by specifying the cancel target by the PUSH transmission instruction 1003 and the resource 1002. Therefore, the receiving apparatus 102 can directly cancel the PUSH transmission by directly specifying the cancellation target without requiring an extra transaction.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1101 including PUSH transmission instructions 1102 and 1103 in an accept-push-policy header to the transmission apparatus 101.
  • the request 1101 has two accept-push-policy headers, and PUSH transmission instructions 1102 and 1103 are included by these two headers.
  • the PUSH transmission instructions 1102 and 1103 may be included in a single accept-push-policy header instead of a separate accept-push-policy header.
  • the number “2” following “urn: sample: push-next” indicates the number of segments to be acquired following “/ example / tmp / segmentA1”.
  • the receiving apparatus 102 requests the PUSH transmission of the segment A2 and the segment A3 by the PUSH transmission instruction 1102.
  • the two numbers in parentheses following “/ example / tmp / segmentB (% 01d)” specify the requested segment by the range of values that “(% 01d)” can take. is doing.
  • a PUSH transmission request for segment B2 and segment B3 is made in accordance with the PUSH transmission instruction 1103.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1101 including the PUSH transmission instructions 1102 and 1103.
  • the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1106 of “/ example / tmp / push1” to the received PUSH transmission instruction 1102. Furthermore, an identifier 1108 of “/ example / tmp / push2” is allocated to the PUSH transmission instruction 1103. In this example, the identifier adopts the URL format.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1104 including responses to the PUSH transmission instructions 1102 and 1103 in the push-policy header to the reception apparatus 102.
  • the response 1104 also includes the binary data of segmentA1.
  • responses to the PUSH transmission instructions 1102 and 1103 include PUSH transmission instruction responses 1105 and 1107 having the same contents as the PUSH transmission instructions 1102 and 1103. That is, the response 1104 has two push-policy headers, and includes PUSH transmission instruction responses 1105 and 1107 by these two headers.
  • the PUSH transmission instruction responses 1105 and 1107 may be included in one push-policy header instead of separate push-policy headers.
  • 11A, 11B, and 11C further include an identifier 1106 (“push1”) corresponding to the response 1105 and an identifier 1108 (“push2”) corresponding to the response 1107.
  • push1 an identifier 1106
  • push2 an identifier 1108
  • This prefix is not limited to “push-URL”.
  • the transmission apparatus 101 transmits PUSH_PROMISE 1109 to 1112 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102.
  • the receiving apparatus 102 receives PUSH_PROMISE 1109 to 1112 from the transmitting apparatus 101.
  • PUSH_PROMISE 1109, 1110, 1111, and 1112 may be transmitted / received before the response 1104.
  • the instruction management unit 206 of the transmission apparatus 101 associates and holds the received PUSH transmission instruction 1102 and the identifier 1106, and the PUSH transmission instruction 1103 and the identifier 1108.
  • the communication unit 308 of the reception apparatus 102 receives a response 1104 including a response 1105 to the PUSH transmission instruction 1102 and a response 1107 to the PUSH transmission instruction 1103.
  • the instruction management unit 306 of the receiving apparatus 102 holds the PUSH transmission instructions 1102 and 1103 received after the response is returned in association with the identifiers 1106 and 1108.
  • the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1113 including the binary data of the segment A2 to the reception apparatus 102 as the PUSH transmission of the segment A2.
  • step S ⁇ b> 705 the communication unit 308 of the reception apparatus 102 receives the response 1113.
  • the communication unit 308 of the reception apparatus 102 transmits the request 1114 including the PUSH transmission cancel instruction 1115 in the accept-push-policy header.
  • the PUSH transmission cancel instruction 1115 has a content of canceling all segments scheduled to be PUSH transmitted by the PUSH transmission instruction 1103 identified by the identifier 1108.
  • An identifier 1108 corresponding to the PUSH transmission instruction 1103 to be canceled is specified in the path header of the request 1114.
  • step S ⁇ b> 606 the communication unit 207 of the transmission apparatus 101 receives the request 1114 including the PUSH transmission cancel instruction 1115 from the reception apparatus 102.
  • the instruction management unit 206 of the transmission apparatus 101 specifies a cancel candidate segment for one of the segments scheduled to be pushed by the PUSH transmission instruction 1103 to be canceled determined from the identifier 1108.
  • the PUSH scheduled segments according to the PUSH transmission instruction 1103 are segment B2 and segment B3, one of them, segment B2, is specified as a cancel candidate segment.
  • segment B2 which is a cancel candidate segment, determines that it is not a PUSH transmission target other than the PUSH transmission instruction 1103 according to the PUSH transmission instruction 1102 adopted by the transmission apparatus 101 (NO in S608), and proceeds to S609. .
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B2, and the segment determination unit 205 cancels the PUSH transmission of the segment B2.
  • transmission reservation by PUSH_PROMISE 1111 since transmission reservation by PUSH_PROMISE 1111 has already been completed, transmission of RST_STREAM 1118 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • the instruction management unit 206 of the transmission apparatus 101 identifies the PUSH transmission instruction 1103 to be canceled determined from the identifier 1108 as a PUSH scheduled segment, and identifies segment B ⁇ b> 3, which is one of them, as a cancel candidate segment.
  • segment B3 which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1102 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1103 (NO in S608), and the process proceeds to S609. .
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B3, and the segment determination unit 205 cancels the PUSH transmission of the segment B3.
  • transmission reservation by PUSH_PROMISE 1112 since transmission reservation by PUSH_PROMISE 1112 has already been completed, transmission of RST_STREAM 1119 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • S610 it is determined that cancellation is possible for all the cancel candidate segments of the PUSH transmission instruction 1103 according to the PUSH transmission cancellation instruction 1115 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1116 including a response 1117 to the PUSH transmission cancel instruction 1115 in the push-policy header to the reception apparatus 102.
  • This response 1117 has the same content as the PUSH transmission cancel instruction 1115.
  • the communication unit 308 of the reception apparatus 102 receives the response 1116 including the response 1117 of the PUSH transmission cancel instruction.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1111 and 1112 to the receiving apparatus 102 for the canceled segment B2 and segment B3, it is necessary to cancel them. Therefore, the transmission apparatus 101 transmits RST_STREAM 1118 and 1119 to the reception apparatus 102, and the reception apparatus 102 receives them.
  • the reception apparatus 102 may transmit these RST_STREAMs 1118 and 1119 before S706 or after S707.
  • the example in which two PUSH transmission instructions 1102 and 1103 are transmitted and cancellation of all segments is instructed for one PUSH transmission instruction has been described.
  • the identifiers 1106 and 1108 are assigned to the respective PUSH transmission instructions so that the PUSH transmission instruction can be designated, so that it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target. It can be performed.
  • the PUSH transmission instruction 1202 makes a PUSH transmission request for the next four segments continuous from the segment A1 in terms of reproduction time.
  • PUSH_PROMISE 1206 and 1207 PUSH_PROMISE 1208 and 1209 that reserve transmission of segment A4 and segment A5 are transmitted.
  • the reception apparatus 102 transmits the PUSH transmission instruction 1212 to the transmission apparatus 101 as a request 1211 including the accept-push-policy header.
  • the PUSH transmission instruction 1212 is an instruction to cancel two segments from the back among the scheduled transmission segments in response to the PUSH transmission instruction 1202 instructing the PUSH transmission of the next four segments continuous from the segment A1 in terms of the reproduction time. . This point will be described in more detail.
  • the PUSH transmission instruction 1212 is a request for PUSH transmission of two consecutive segments segmentA2 and segmentA3, which are identified by the identifier “push1” (1205) and follow segmentA1.
  • the PUSH transmission instruction 1212 corresponds to a request for canceling the transmission requests of the segment A4 and the segment A5. .
  • the operation is performed according to the request transmitted / received last.
  • the PUSH transmission instruction 1202 to be canceled is specified.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1211 including the PUSH transmission cancel instruction 1212 from the reception apparatus 102.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A4, which is one of the PUSH scheduled segments based on the PUSH transmission instruction 1202 to be canceled determined from the identifier 1205, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1202 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A4, and the segment determination unit 205 cancels the PUSH transmission of the segment A4.
  • transmission of RST_STREAM 1215 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • the instruction management unit 206 of the transmission apparatus 101 identifies the PUSH transmission instruction 1202 to be canceled determined from the identifier 1205 as a PUSH scheduled segment, and identifies segment A5, which is one of them, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1202 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A5, and the segment determination unit 205 cancels the PUSH transmission of the segment A5.
  • transmission reservation by the PUSH_PROMISE 1209 since transmission reservation by the PUSH_PROMISE 1209 has already been completed, transmission of RST_STREAM 1216 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1213 including a response 1214 to the PUSH transmission cancel instruction 1212 in the push-policy header to the reception apparatus 102.
  • This response 1214 has the same content as the PUSH transmission cancel instruction 1212.
  • the communication unit 308 of the reception apparatus 102 receives a response 1213 including a PUSH transmission cancel instruction response 1214.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1208 and 1209 to the receiving apparatus 102 with respect to the canceled segment A4 and segment A5. Therefore, in order to cancel these, RST_STREAM 1215 and 1216 are transmitted, and the receiving apparatus 102 receives them.
  • the reception apparatus 102 may transmit these RST_STREAMs 1215 and 1216 before S706 or after S707.
  • the receiving apparatus 102 can specify the identifier 1205 and cancel transmission of a part of the transmission target segment without requiring an extra transaction.
  • the identifier 1205 by giving the identifier 1205 to the PUSH transmission instruction, the receiving apparatus 102 can specify the identifier 1205 and cancel transmission of a part of the transmission target segment without requiring an extra transaction.
  • FIGS. 13A, 13B, and 13C Will be described with reference to FIG. 13A, 13B, and 13C show examples in which all PUSH transmission instructions cancel all the segments scheduled to be PUSH transmitted.
  • Reference numerals 1301 to 1313 in FIGS. 13A, 13B, and 13C are the same as reference numerals 1101 to 1113 in FIGS. 11A, 11B, and 11C.
  • the processing from S601 to 605 in FIG. 6 and S701 to 705 in FIG. 7 is the same as the processing described with reference to FIGS. 11A, 11B, 11C, and FIGS.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1314 including the PUSH transmission cancel instruction 1316 in the accept-push-policy header to the transmission apparatus 101.
  • the PUSH transmission cancel instruction 1316 is a cancel instruction for canceling all segments scheduled to be PUSH transmitted by both the PUSH transmission instructions 1302 and 1303.
  • an identifier 1315 (“push") indicating all the PUSH transmission instructions currently used by the transmission apparatus 101 is designated. This identifier 1315 is notified to the receiving apparatus 102 in advance by, for example, the transmitting apparatus 101 describing it in the MPD.
  • an identifier for designating all PUSH transmission instructions may be understood from the format of the identifier assigned to each PUSH transmission instruction. For example, it is assumed that the identifier assigned to each PUSH transmission unit takes the form of “character string + numerical value”. Then, only the character string portion obtained by removing the numerical value part of the identifier assigned to each PUSH transmission instruction may represent an identifier for designating all the PUSH transmission instructions. The transmission apparatus 101 and the reception apparatus 102 share this rule in advance.
  • 13A, 13B, and 13C are “/ example / tmp / push1” and “/ example / tmp / push2”, respectively. It can be seen that the identifier for designating all PUSH transmission instructions is “/ example / tmp / push” excluding numerical values.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1314 including the PUSH transmission cancel instruction 1316.
  • the instruction management unit 206 of the transmission apparatus 101 identifies an untransmitted segment as a cancellation candidate among the PUSH scheduled segments based on the PUSH transmission instruction 1302 that is one of the cancellation targets determined from the identifier 1315.
  • segment A3 which is one of the untransmitted segments, is specified as a cancel candidate segment.
  • segment A3 which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1303 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1302 (NO in S608), and the process proceeds to S609. .
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3.
  • transmission reservation by the PUSH_PROMISE 1310 since transmission reservation by the PUSH_PROMISE 1310 has already been completed, transmission of RST_STREAM 1319 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • S610 it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1302 by the PUSH transmission cancellation instruction 1316 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
  • S611 since there are 1303 PUSH transmission instructions to be canceled other than 1302 (NO in S611), the process proceeds to S607.
  • step S ⁇ b> 607 the instruction management unit 206 of the transmission apparatus 101 identifies segment B ⁇ b> 2, which is one of the PUSH scheduled segments whose PUSH transmission instruction 1303, which is one of the cancellation targets determined from the identifier 1315, as a cancel candidate segment. To do.
  • segment B2 which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1302 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1303 (NO in S608), and the process proceeds to S609. .
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B2, and the segment determination unit 205 cancels the PUSH transmission of the segment B2.
  • transmission reservation by the PUSH_PROMISE 1311 since transmission reservation by the PUSH_PROMISE 1311 has already been completed, transmission of RST_STREAM 1320 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • step S ⁇ b> 607 the instruction management unit 206 of the transmission apparatus 101 identifies segment B ⁇ b> 3, which is one of the PUSH transmission instructions 1303, which is one of the cancellation targets determined from the identifier 1315, as a cancel candidate segment. To do.
  • segment B3 which is a cancellation candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1302 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1303 (NO in S608), and the process proceeds to S609. .
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B3, and the segment determination unit 205 cancels the PUSH transmission of the segment B3.
  • transmission reservation by the PUSH_PROMISE 1312 since transmission reservation by the PUSH_PROMISE 1312 has already been completed, transmission of RST_STREAM 1321 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • S610 it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1303 according to the PUSH transmission cancellation instruction 1316 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1317 including a response 1318 to the PUSH transmission cancel instruction 1316 in the push-policy header to the reception apparatus 102.
  • This response 1318 has the same content as the PUSH transmission cancel instruction 1316.
  • step S ⁇ b> 707 the communication unit 308 of the reception apparatus 102 receives a response 1317 including a PUSH transmission cancel instruction response 1318 from the transmission apparatus 101.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1310 to 1312 to the receiving apparatus 102. Therefore, in order to cancel these, the transmission apparatus 101 transmits RST_STREAM 1319 to 1321, and the reception apparatus 102 receives this.
  • the RST_STREAM 1319 to 1321 may be transmitted by the receiving apparatus 102 before S706 or after S707.
  • FIGS. 14A and 14B 1401 to 1404 are the same as 801 to 804, and 1405 to 1407 are the same as 806 to 808. Moreover, since S601 to 605 in FIG. 6 and S701 to 705 in FIG. 7 are the same as those in FIGS. 8A and 8B, description thereof will be omitted. As can be seen from the fact that the response 1403 in FIGS. 14A and 14B has no description corresponding to 805 in FIGS. 8A and 8B, unlike FIGS. 8A and 8B, no identifier is assigned to the PUSH transmission instruction 1402 in FIGS. 14A and 14B. However, they may be allocated in the same manner as in FIGS. 8A and 8B.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1408 including the PUSH transmission cancel instruction 1410 in the accept-push-policy header to the transmission apparatus 101.
  • the PUSH transmission cancel instruction 1410 has a content for canceling all the segments scheduled to be PUSH transmitted by the target PUSH transmission instruction.
  • the PUSH transmission cancel instruction 1410 includes “/ example / tmp / segmentA1” 1411 which is a URL specified when the PUSH transmission instruction 1402 is instructed in order to specify a PUSH transmission instruction to be canceled.
  • the URL 1411 is included behind the PUSH transmission cancel instruction 1410 together with the prefix “path”. This prefix is not limited to “path”. This prefix may not be necessary.
  • a cancel instruction indicating a list format such as “urn: sample: push-cancel-list” may be specified in 1410.
  • a format such as "" / example / tmp / segmentA3 ";” / example / tmp / segmentA4 ";” / example / tmp / segmentA5 ";” / example / tmp / segmentA6 "" is specified.
  • a cancel instruction indicating a template format such as “urn: sample: push-cancel-template” may be specified in 1410. Then, instead of 1411, a format such as “/ example / tmp / segmentA ⁇ % d ⁇ ; ⁇ 3,4,5,6 ⁇ ” or “/ example / tmp / segmentA ⁇ % d ⁇ ; ⁇ 3-6 ⁇ ” Is specified.
  • the communication unit 308 of the receiving apparatus 102 includes a PUSH transmission instruction 1412 to be newly set in the request 1408 separately from the PUSH transmission cancellation instruction.
  • a PUSH transmission instruction 1412 is included after the PUSH transmission cancellation instructions 1410 and 1411 in the accept-push-policy header.
  • a PUSH transmission instruction 1412 may be included before 1410 and 1411.
  • a URL 1409 that is a base for executing the PUSH transmission instruction 1412 to be newly set is included.
  • the URL specified in the path header is “/ example / tmp / segment B3”, and the PUSH transmission instruction 1423 requests PUSH transmission of four consecutive segments. Therefore, the PUSH transmission instruction 1412 has a content for instructing PUSH transmission of the four segments segmentB4 to segmentB7 that are continuous from the segmentB3 in terms of reproduction time.
  • the communication unit 207 of the transmission apparatus 101 transmits to the reception apparatus 102 a response 1415 that includes a push-policy header in response 1414 to the PUSH transmission cancel instruction 1410 and the PUSH transmission instruction 1412.
  • This response 1414 has the same content as 1410, 1411 and 1412.
  • the communication unit 308 of the receiving apparatus 102 receives the PUSH transmission cancel instruction 1410, the PUSH transmission instruction 1412 response 1414, and the response 1413 including the segment B3 binary data.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1406 to the receiving apparatus 102 for the canceled segment A3. Therefore, the transmission apparatus 101 transmits RST_STREAM 1415 to cancel this, and the reception apparatus 102 receives this.
  • This RST_STREAM 1415 may be transmitted by the receiving apparatus 102 before S706 or after S707.
  • the transmitting apparatus 101 After S612, the transmitting apparatus 101 newly starts PUSH transmission based on the PUSH transmission instruction 1412. That is, the transmission apparatus 101 starts PUSH transmission of segment B4 to segment B7.
  • the PUSH transmission instruction to be canceled is specified by the identifier, and the example in which another PUSH transmission instruction is performed while canceling all the segments scheduled to be pushed by the PUSH transmission instruction has been described. Also in the operation example 7, by specifying the PUSH transmission instruction by the identifier, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
  • reference numerals 1501 to 1513 are the same as 1101 to 1113 in FIGS. 11A, 11B, and 11C. 6 are the same as the processing described with reference to FIGS. 11A, 11B, 11C, and 8A, 8B, and thus description thereof is omitted.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1514 including the PUSH transmission cancel instruction 1516 in the accept-push-policy header to the transmission apparatus 101.
  • the PUSH transmission cancel instruction 1516 has a content for canceling all the segments scheduled to be PUSH transmitted by the target PUSH transmission instruction.
  • the PUSH transmission cancel instruction 1516 includes “/ example / tmp / segmentA1” 1517 that is a URL specified when the PUSH transmission instructions 1502 and 1503 are instructed in order to specify a PUSH transmission instruction to be canceled. By specifying the URL 1517, all PUSH transmission instructions that specify "/ example / tmp / segmentA1" and make a request are subject to cancellation.
  • the communication unit 308 of the receiving apparatus 102 includes a PUSH transmission instruction 1518 to be newly set in the request 1514 separately from the PUSH transmission cancellation instruction.
  • a PUSH transmission instruction 1518 is included after the PUSH transmission cancellation instructions 1516 and 1517 in the accept-push-policy header.
  • a PUSH transmission instruction 1518 may be arranged before the PUSH transmission cancellation instructions 1516 and 1517.
  • a URL 1515 serving as a base when the PUSH transmission instruction 1518 to be newly set is executed is included. Since the URL specified in the path header is “/ example / tmp / segmentC3”, the PUSH transmission instruction 1518 is an instruction to push the next four segments (C4 to C7) consecutive in playback time from the segment C3. It becomes.
  • step S612 the communication unit 207 of the transmission apparatus 101 transmits a response 1519 including a response 1520 to the PUSH transmission cancellation instruction 1516 and the PUSH transmission instruction 1518 in the push-policy header to the reception apparatus 102.
  • the response 1520 has the same contents as the PUSH transmission cancel instructions 1516 and 1517 and the PUSH transmission instruction 1518.
  • the response 1519 includes segment C3 binary data.
  • the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1521 of “/ example / tmp / push3” to the received PUSH transmission instruction 1518. Then, the identifier 1521 is included in the push-policy header of the response 1519. By inserting a “push-URL” prefix in front of the identifier 1521, it is possible to distinguish where the identifier 1521 is from the push-policy header. This prefix is not limited to “push-URL”.
  • step S ⁇ b> 707 the communication unit 308 of the reception apparatus 102 receives a response 1519 including a PUSH transmission cancel instruction 1516 and a PUSH transmission instruction 1518 response 1521 from the transmission apparatus 101.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1510 to 1512 to the receiving apparatus 102 for the canceled segment A3, segment B2, and segment B3. Therefore, in order to cancel these, the transmission apparatus 101 transmits RST_STREAM 1522 to 1524, and the reception apparatus 102 receives this.
  • These RST_STREAMs 1522 to 1524 may be transmitted by the receiving apparatus 102 before S706 or after S707.
  • the transmission apparatus 101 After S612, the transmission apparatus 101 newly starts PUSH transmission based on the PUSH transmission instruction 1518.
  • the identifier is assigned by the transmitting apparatus 101, and the receiving apparatus 102 skips the processing of S701.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1601 including a PUSH transmission instruction 1602 to the transmission apparatus 101.
  • the PUSH transmission instruction includes a character string “urn: sample: push-next; 2” after the prefix “push_directive”. This prefix is not limited to “push_directive”.
  • a request 1601 is a message for requesting segment A1, and the PUSH transmission instruction 1602 instructs the segment A1 to perform PUSH transmission of the next two segments that are continuous in playback time.
  • step S ⁇ b> 601 the communication unit 207 of the transmission apparatus 101 receives a request 1601 including a PUSH transmission instruction 1602 from the reception apparatus 102.
  • the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1605 of “/ example / tmp / push1” to the received PUSH transmission instruction 1602.
  • the identifier adopts the URL format.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1603 including a response 1604 to the PUSH transmission instruction 1602 to the reception apparatus 102, including a response 1603 including the binary data of the segment A1.
  • This response 1604 has the same content as the PUSH transmission instruction 1602.
  • the PUSH transmission instruction response 1604 is included after the prefix “push_ack”. This prefix is not limited to “push_ack”.
  • An identifier 1605 is included in correspondence with the PUSH transmission instruction response 1606.
  • the instruction management unit 206 of the transmission apparatus 101 holds the received PUSH transmission instruction 1602 and the identifier 1605 in association with each other.
  • the communication unit 308 of the receiving apparatus 102 receives a response 1603 including a response 1604 of the PUSH transmission instruction 1602.
  • step S ⁇ b> 704 the instruction management unit 306 of the reception apparatus 102 holds the PUSH transmission instruction 1602 received after the response is returned in association with the identifier 1605.
  • the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1606 including the binary data of the segment A2 to the reception apparatus 102 as the PUSH transmission of the segment A2.
  • the communication unit 308 of the reception apparatus 102 receives the response 1606.
  • the communication unit 308 of the receiving apparatus 102 transmits, as a request 1607, a PUSH transmission cancel instruction 1608 for all segments scheduled to be PUSH transmitted in accordance with the PUSH transmission instruction 1602.
  • the identifier 1605 By specifying the identifier 1605, the PUSH transmission target to be canceled is specified.
  • the identifier 1605 is placed after the prefix “segment_uri”. This prefix is not limited to “segment_uri”.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1607 including the PUSH transmission cancel instruction 1608 from the reception apparatus 102.
  • the instruction management unit 206 of the transmission apparatus 101 identifies segment A3, which is one of the PUSH scheduled segments based on the PUSH transmission instruction 1602 to be canceled determined from the identifier 1605, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1602 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3.
  • S610 it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1602 according to the PUSH transmission cancellation instruction 1608 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1609 including a response 1610 to the PUSH transmission cancel instruction 1608 to the reception apparatus 102.
  • the response 1610 has the same content as the PUSH transmission cancel instruction 1608.
  • the PUSH transmission cancel instruction response 1610 is placed behind the prefix “push_ack”. This prefix is not limited to “push_ack”.
  • step S ⁇ b> 707 the communication unit 308 of the reception apparatus 102 receives a response 1609 including a PUSH transmission cancel instruction response 1610 from the transmission apparatus 101.
  • HTTP / 2 and WebSocket have been described, but the present embodiment can be applied to QUIIC and other protocols having a PUSH function.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1701 including PUSH transmission instructions 1702 and 1703 in the accept-push-policy header to the transmission apparatus 101.
  • the PUSH transmission instructions 1702 and 1703 may be included in a single accept-push-policy header instead of separate accept-push-policy headers.
  • the number “2” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / video / segmentA1”. Therefore, the receiving apparatus 102 requests PUSH transmission of video / segment A2 and video / segment A3 by a PUSH transmission instruction 1702.
  • the two numbers in parentheses following “/ example / audio / segmentA (% 01d)” identify the requested segment by the range of values that “(% 01d)” can take. .
  • “ ⁇ 2, 3 ⁇ ” is specified as the range, and therefore, PUSH transmission requests for audio / segment A2 and audio / segment A3 are made in accordance with the PUSH transmission instruction 1703.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1701 including the PUSH transmission instructions 1702 and 1703.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1704 including responses to the PUSH transmission instructions 1702 and 1703 in the push-policy header to the reception apparatus 102.
  • the response 1704 also includes binary data of video / segment A1.
  • the response 1704 includes PUSH transmission instruction responses 1705 and 1706 having the same contents as the PUSH transmission instructions 1702 and 1703 as responses to the PUSH transmission instructions 1702 and 1703. That is, the response 1704 has two push-policy headers, and includes PUSH transmission instruction responses 1705 and 1706 by these two headers. Note that the PUSH transmission instruction responses 1705 and 1706 may be included in a single push-policy header instead of separate push-policy headers.
  • the transmission apparatus 101 After transmitting the response 1704, the transmission apparatus 101 transmits PUSH_PROMISE 1707 to 1711 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102.
  • the receiving apparatus 102 receives PUSH_PROMISE 1707 to 1711 from the transmitting apparatus 101.
  • the PUSH_PROMISE 1707, 1708, 1709, 1710, and 1711 may be transmitted / received before the response 1704.
  • the transmission apparatus 101 since the data type of the segment is used as an identifier, the transmission apparatus 101 skips the process of S604.
  • the communication unit 308 of the reception apparatus 102 receives a response 1704 including a response 1705 to the PUSH transmission instruction 1702 and a response 1706 to the PUSH transmission instruction 1703.
  • the instruction management unit 306 of the receiving apparatus 102 holds the PUSH transmission instructions 1702 and 1703 that have been received after receiving a response.
  • a plurality of PUSH transmission instructions are exchanged by a set of requests and responses.
  • the PUSH transmission canceling process according to the present embodiment is performed even by a method in which a request and a response are exchanged for each PUSH transmission instruction. Is possible.
  • the transmission apparatus 101 starts PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1712 including the binary data of audio / segment A1 to the reception apparatus 102 as PUSH transmission of audio / segment A1.
  • the communication unit 308 of the receiving apparatus 102 receives the response 1712.
  • the communication unit 308 of the reception apparatus 102 transmits a request 1713 including a PUSH transmission cancel instruction 1715 and a PUSH transmission instruction 1714.
  • a push-cancel header is used as the PUSH transmission cancel instruction 1715, but a header having a name different from the push-cancel may be used as the cancel instruction.
  • a segment of video data is set as a PUSH transmission cancel target, and a value of “video” is specified as a value of the push-cancel header 1715 to indicate the PUSH transmission cancel target, but a value different from “video” is specified. It may be used.
  • segments other than video data such as audio data and metadata segments may be subject to PUSH transmission cancellation by specifying values such as “audio” and “metadata”.
  • the data type of the segment may be specified in detail, such as a codec name or audio language. By designating “immediate” or the like, all segments may be subject to PUSH transmission cancellation. Instead of a character string indicating the type of data such as “video”, an ID of AdaptationSet or Resetting may be used as a value for instructing a PUSH cancellation target.
  • the number “1” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / video / segmentB2”. Therefore, the receiving apparatus 102 requests the PUSH transmission of video / segment B3 by the PUSH transmission instruction 1714.
  • the communication unit 207 of the transmission apparatus 101 receives the request 1713 including the PUSH transmission cancel instruction 1715 and the PUSH transmission instruction 1714 from the reception apparatus 102.
  • the push transmission instruction 1702 to be canceled is specified from the receiving apparatus that has transmitted the request 1713 including the cancellation instruction 1715 and the type of data included in the cancellation instruction 1715 (video in this example).
  • the instruction management unit 206 of the transmission device 101 identifies one of the segments scheduled to be pushed by the PUSH transmission instruction 1702 as a cancel candidate segment from the value of the PUSH transmission cancellation instruction 1715.
  • the PUSH-scheduled segments according to the PUSH transmission instruction 1103 are video / segment A2 and video / segment A3, so that one of them, video / segment A2, is specified as a cancel candidate segment.
  • video / segment A2 which is a cancel candidate segment, is determined not to be a PUSH transmission target according to the PUSH transmission instruction 1703 employed by the transmission apparatus 101 other than the PUSH transmission instruction 1702 (NO in S608), and the process proceeds to S609. Transition.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the video / segment A2 PUSH transmission, and the segment determination unit 205 cancels the video / segment A2 PUSH transmission.
  • transmission reservation by the PUSH_PROMISE 1708 since transmission reservation by the PUSH_PROMISE 1708 has already been completed, transmission of RST_STREAM 1719 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • the instruction management unit 206 of the transmission apparatus 101 identifies video / segment A ⁇ b> 3, which is one of the PUSH scheduled segments according to the PUSH transmission instruction 1702, as a cancel candidate segment from the value of the PUSH transmission cancellation instruction 1715.
  • the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the video / segment A3 PUSH transmission, and the segment determination unit 205 cancels the video / segment A3 PUSH transmission.
  • transmission reservation by the PUSH_PROMISE 1710 since transmission reservation by the PUSH_PROMISE 1710 has already been completed, transmission of RST_STREAM 1721 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
  • the communication unit 207 of the transmission apparatus 101 transmits a response 1716 including a response 1718 to the PUSH transmission cancel instruction 1715 and a response 1717 to the PUSH transmission instruction 1714 to the reception apparatus 102.
  • a response 1718 to the PUSH transmission cancel instruction 1715 uses the push-cancel header and has the same content as the PUSH transmission cancel instruction 1715. Another header may be used.
  • Response 1717 also includes binary data of video / segment B2.
  • the communication unit 308 of the reception apparatus 102 receives a response 1716 including a response 1718 to the PUSH transmission cancel instruction 1715 and a response 1717 to the PUSH transmission instruction 1714.
  • the transmission apparatus 101 After transmitting the response 1716, the transmission apparatus 101 transmits PUSH_PROMISE 1719 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102.
  • the receiving apparatus 102 receives PUSH_PROMISE 1719 from the transmitting apparatus 101.
  • the transmitting apparatus 101 transmits PUSH_PROMISE 1708 and 1710 to the receiving apparatus 102 for the canceled video / segment A2 and video / segment A3, it is necessary to cancel them. Therefore, the transmission apparatus 101 transmits RST_STREAM 1720 and 1721 to the reception apparatus 102, and the reception apparatus 102 receives them.
  • the RST_STREAM 1720 and 1721 may be transmitted by the receiving apparatus 102 before S706 or after S707.
  • the example in which the PUSH transmission cancel instruction 1715 and the PUSH transmission instruction 1714 are performed together has been described. Since the PUSH transmission cancellation instruction 1715 and the PUSH transmission instruction 1714 can be transmitted by the same request, the PUSH transmission instruction can be reset without requiring an extra transaction. Also, by making it possible to specify the data type of the segment, it is possible to easily cancel PUSH transmission and reset PUSH transmission only for a specific type of segment. As an example, it is possible to cancel the PUSH transmission of only the video segment without canceling the audio segment and reset the PUSH transmission of the video segment having a different resolution while the video segment and the audio segment are targeted for the push. .
  • PUSH transmission can be canceled with a small number of transactions between the transmission apparatus 101 and the reception apparatus 102. Also, when canceling only a part of PUSH transmission instructions when performing a plurality of PUSH transmission instructions, or when canceling only a part of a segment scheduled for PUSH transmission, the receiving apparatus 102 cancels with one request transmission. It can be carried out. Further, when MPEG-DASH is transmitted / received on HTTP / 2 and the receiving apparatus 102 instructs to cancel PUSH transmission, it is not necessary to individually cancel segments not reserved for transmission by PUSH_PROMISE. Therefore, the bandwidth on the network can be saved.
  • the present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
  • a circuit for example, ASIC

Abstract

A server device receives, from a client device, a push transmission instruction relating to medium segments acquired by dividing content data, and performs push transmission of the medium segments according to the received push transmission instruction to the client device. In the case where the server device receives, from the client device, a push cancel instruction including identification information for specifying a medium segment for which the push transmission is cancelled out of the medium segments according to the received push transmission instruction, the server device cancels the push transmission of the medium segment specified on the basis of the identification information.

Description

情報処理装置及びその制御方法、コンピュータプログラムInformation processing apparatus, control method therefor, and computer program
　本発明は情報処理装置及びその制御方法、コンピュータプログラムに関し、特に、コンテンツのプッシュ技術に関する。 The present invention relates to an information processing apparatus, a control method thereof, and a computer program, and more particularly, to a content push technique.
　近年、音声データや映像データ等により構成されるストリーミング形式のコンテンツをユーザにリアルタイムに配信する配信システムが提供されている。このような配信システムにより、ユーザは、自身の端末装置を介して、ライブ映像等の所望のコンテンツをリアルタイムで楽しむことができる。 In recent years, a distribution system for distributing content in a streaming format composed of audio data, video data, and the like to users in real time has been provided. With such a distribution system, the user can enjoy desired content such as live video in real time via his / her terminal device.
　スマートフォンやタブレットのような端末の普及により、様々な端末装置でいつでもどこでもストリーミングコンテンツを楽しみたいという需要が高まって来ている。この要求を実現するために、端末装置の能力や端末装置が置かれる通信状況に応じて、動的に取得するストリームを変更する方式（ＭＰＥＧ－ＤＡＳＨ、Ｈｔｔｐ　Ｌｉｖｅ　Ｓｔｒｅａｍｉｎｇなど）が注目されている。ＤＡＳＨはＤｙｎａｍｉｃ　Ａｄａｐｔｉｖｅ　Ｓｔｒｅａｍｉｎｇ　ｏｖｅｒ　ＨＴＴＰの略称である。 With the widespread use of terminals such as smartphones and tablets, there is an increasing demand to enjoy streaming content anytime and anywhere on various terminal devices. In order to realize this request, attention has been paid to a method (MPEG-DASH, HTTP Live Streaming, etc.) that dynamically changes a stream to be acquired according to the capability of the terminal device and the communication situation in which the terminal device is placed. DASH is an abbreviation for Dynamic Adaptive Streaming over HTTP.
　これらの方式では映像データを細かい時間単位のセグメントに分割し、セグメントを取得するためのＵＲＬ（Ｕｎｉｆｏｒｍ　Ｒｅｓｏｕｒｃｅ　Ｌｏｃａｔｏｒ）をプレイリストと呼ばれるファイルに記述する。受信装置は始めにこのプレイリストを取得し、プレイリストに記述されている情報を用いて所望の映像データを取得する。プレイリスト中に複数のバージョンの映像データセグメントに対するＵＲＬを記載することで、受信装置は、自身の処理能力や通信環境に応じて、最適なバージョンの映像データセグメントを取得することができる。 In these methods, video data is divided into small time unit segments, and a URL (Uniform Resource Locator) for acquiring the segments is described in a file called a playlist. The receiving apparatus first acquires this playlist, and acquires desired video data using information described in the playlist. By describing URLs for a plurality of versions of video data segments in the playlist, the receiving apparatus can acquire an optimal version of the video data segments according to its own processing capability and communication environment.
　これらストリーミング方式には、送信装置からデータセグメントをＰＵＳＨ（プッシュ）送信する機能がある。ＰＵＳＨ送信は、受信装置からリクエストがなくても、リクエストの受信に先立って対応するレスポンスを送信することができるため、映像の再生遅延を軽減することができる。 These streaming systems have a function of PUSH (push) transmission of a data segment from a transmission device. Since the PUSH transmission can transmit a corresponding response prior to the reception of the request even if there is no request from the receiving apparatus, it is possible to reduce the video reproduction delay.
　特許文献１には、ＭＰＥＧ－ＤＡＳＨを利用したメディア配信において、メディアの切り替えの要求に応じて、ＰＵＳＨ送信によりメディアを配信することにより、メディアの切り替えを高速に行う構成が記載されている。 Patent Document 1 describes a configuration in which media is switched at high speed by distributing media by PUSH transmission in response to a request for switching media in media distribution using MPEG-DASH.
特開２０１６－１５５３４号公報JP 2016-15534 A
　しかし、従来の構成においては、セグメントに分割されたコンテンツデータをＰＵＳＨ送信する一般的なシステムにおいては、未送信のセグメントのＰＵＳＨ送信を受信側からキャンセルする仕組みが提供されていない。そのため、従来の構成においては、ＰＵＳＨ送信キャンセルのために行う送信装置と受信装置との間のトランザクションが増えてしまうという課題があった。例えば、ＰＵＳＨ送信対象のセグメントのうち一部のセグメントのＰＵＳＨ送信をキャンセルしたり、複数のＰＵＳＨ送信指示に基づきＰＵＳＨ送信が予約されている場合に特定のＰＵＳＨ予約をキャンセルしたりする様なときにトランザクションが増大していた。 However, in the conventional configuration, in a general system for performing push transmission of content data divided into segments, a mechanism for canceling push transmission of an unsent segment from the reception side is not provided. Therefore, in the conventional configuration, there is a problem that transactions between the transmission device and the reception device for performing PUSH transmission cancellation increase. For example, when PUSH transmission of some segments among PUSH transmission target segments is cancelled, or when a specific PUSH reservation is canceled when PUSH transmission is reserved based on a plurality of PUSH transmission instructions Transactions were growing.
　本発明の一実施形態によれば、プッシュ送信に関する予約を少ないトランザクションでキャンセル可能にする技術が提供される。 According to an embodiment of the present invention, there is provided a technique that enables a reservation related to push transmission to be canceled with few transactions.
　本発明の一態様によるサーバ装置は以下の構成を備える。即ち、
　コンテンツデータが分割されたメディアセグメントに関するプッシュ送信指示をクライアント装置から受信する受信手段と、
　前記受信手段により受信されたプッシュ送信指示に応じたメディアセグメントを前記クライアント装置に対してプッシュ送信する送信手段と、
　前記受信手段により受信されたプッシュ送信指示に応じたメディアセグメントのうち、前記送信手段によるプッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するために用いられる識別情報を含むプッシュキャンセル指示を前記クライアント装置から受信した場合、前記識別情報に基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする制御手段と、を有する。 A server device according to an aspect of the present invention has the following configuration. That is,
Receiving means for receiving, from the client device, a push transmission instruction regarding the media segment into which the content data is divided;
A transmission unit that push-transmits a media segment corresponding to the push transmission instruction received by the reception unit to the client device;
Among the media segments according to the push transmission instruction received by the receiving means, the push cancel instruction including identification information used for the server device to identify a media segment whose push transmission by the transmitting means is canceled Control means for canceling push transmission by the transmission means of the media segment specified based on the identification information when received from the client device.
　本発明によれば、プッシュ送信に関する予約を少ないトランザクションでキャンセルすることが可能になる。 According to the present invention, it is possible to cancel a reservation related to push transmission with few transactions.
　本発明のその他の特徴及び利点は、添付図面を参照とした以下の説明により明らかになるであろう。なお、添付図面においては、同じ若しくは同様の構成には、同じ参照番号を付す。 Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.
図１は、通信システムのシステム構成図である。FIG. 1 is a system configuration diagram of a communication system. 図２は、送信装置の機能構成例を示すブロック図である。FIG. 2 is a block diagram illustrating a functional configuration example of the transmission apparatus. 図３は、受信装置の機能構成例を示すブロック図である。FIG. 3 is a block diagram illustrating a functional configuration example of the receiving apparatus. 図４は、送信装置のハードウェア構成例を示すブロック図である。FIG. 4 is a block diagram illustrating a hardware configuration example of the transmission apparatus. 図５は、受信装置のハードウェア構成例を示すブロック図である。FIG. 5 is a block diagram illustrating a hardware configuration example of the receiving apparatus. 図６は、送信装置の動作手順を示すフローチャートである。FIG. 6 is a flowchart showing an operation procedure of the transmission apparatus. 図７は、受信装置の動作手順を示すフローチャートである。FIG. 7 is a flowchart showing an operation procedure of the receiving apparatus. 図８Ａは、キャンセル方式の一例を表す図である。FIG. 8A is a diagram illustrating an example of a cancellation method. 図８Ｂは、キャンセル方式の一例を表す図である。FIG. 8B is a diagram illustrating an example of a cancellation method. 図９Ａは、キャンセル方式の一例を表す図である。FIG. 9A is a diagram illustrating an example of a cancellation method. 図９Ｂは、キャンセル方式の一例を表す図である。FIG. 9B is a diagram illustrating an example of a cancellation method. 図１０Ａは、キャンセル方式の一例を表す図である。FIG. 10A is a diagram illustrating an example of a cancellation method. 図１０Ｂは、キャンセル方式の一例を表す図である。FIG. 10B is a diagram illustrating an example of a cancellation method. 図１１Ａは、キャンセル方式の一例を表す図である。FIG. 11A is a diagram illustrating an example of a cancellation method. 図１１Ｂは、キャンセル方式の一例を表す図である。FIG. 11B is a diagram illustrating an example of a cancellation method. 図１１Ｃは、キャンセル方式の一例を表す図である。FIG. 11C is a diagram illustrating an example of a cancellation method. 図１２Ａは、キャンセル方式の一例を表す図である。FIG. 12A is a diagram illustrating an example of a cancellation method. 図１２Ｂは、キャンセル方式の一例を表す図である。FIG. 12B is a diagram illustrating an example of a cancellation method. 図１２Ｃは、キャンセル方式の一例を表す図である。FIG. 12C is a diagram illustrating an example of a cancellation method. 図１３Ａは、キャンセル方式の一例を表す図である。FIG. 13A is a diagram illustrating an example of a cancellation method. 図１３Ｂは、キャンセル方式の一例を表す図である。FIG. 13B is a diagram illustrating an example of a cancellation method. 図１３Ｃは、キャンセル方式の一例を表す図である。FIG. 13C is a diagram illustrating an example of a cancellation method. 図１４Ａは、キャンセル方式の一例を表す図である。FIG. 14A is a diagram illustrating an example of a cancellation method. 図１４Ｂは、キャンセル方式の一例を表す図である。FIG. 14B is a diagram illustrating an example of a cancellation method. 図１５Ａは、キャンセル方式の一例を表す図である。FIG. 15A is a diagram illustrating an example of a cancellation method. 図１５Ｂは、キャンセル方式の一例を表す図である。FIG. 15B is a diagram illustrating an example of a cancellation method. 図１５Ｃは、キャンセル方式の一例を表す図である。FIG. 15C is a diagram illustrating an example of a cancellation method. 図１６は、キャンセル方式の一例を表す図である。FIG. 16 is a diagram illustrating an example of a cancellation method. 図１７Ａは、キャンセル方式の一例を表す図である。FIG. 17A is a diagram illustrating an example of a cancellation method. 図１７Ｂは、キャンセル方式の一例を表す図である。FIG. 17B is a diagram illustrating an example of a cancellation method.
　以下に、添付の図面を参照して、本発明の実施形態について詳細に説明する。以下の実施形態において示す構成は一例にすぎず、本発明は以下に示す具体的な構成例に限定されるものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configurations shown in the following embodiments are merely examples, and the present invention is not limited to the specific configuration examples shown below.
　（システム全体の構成）
　図１は、本発明の一実施形態における通信システムの全体構成を示す図である。本実施形態に係る送信装置１０１は、ネットワーク１０３を介して、受信装置１０２と接続される。なお、送信装置１０１、受信装置１０２はそれぞれ複数存在してもよい。送信装置１０１は例えばサーバ装置であり、受信装置１０２は例えばクライアント装置である。 (System configuration)
FIG. 1 is a diagram showing an overall configuration of a communication system according to an embodiment of the present invention. The transmission apparatus 101 according to the present embodiment is connected to the reception apparatus 102 via the network 103. A plurality of transmission apparatuses 101 and reception apparatuses 102 may exist. The transmission device 101 is, for example, a server device, and the reception device 102 is, for example, a client device.
　送信装置１０１は、セグメントに分割されたコンテンツデータを受信装置１０２へプッシュ送信するコンテンツの送信機能を備えている。なお、セグメントには、コンテンツの再生に用いられるパラメータを記述した初期セグメント（イニシャリゼーションセグメント）と、コンテンツデータを記述したメディアセグメントがある。送信装置１０１は、さらに、ユーザからの入力を受け付ける機能を備えてもよい。送信装置１０１の具体的な例としては、カメラ装置、ビデオカメラ装置、スマートフォン装置、ＰＣ（パーソナルコンピュータ）装置、携帯電話などの情報処理装置が挙げられるが、前述の機能を備えるものであればこれに限定されない。 The transmission apparatus 101 has a content transmission function for pushing content data divided into segments to the reception apparatus 102. The segment includes an initial segment (initialization segment) describing parameters used for content reproduction and a media segment describing content data. The transmission apparatus 101 may further have a function of receiving input from the user. Specific examples of the transmission device 101 include information processing devices such as a camera device, a video camera device, a smart phone device, a PC (personal computer) device, and a mobile phone. It is not limited to.
　受信装置１０２は、コンテンツの再生／表示機能、通信機能を備え、送信装置１０１からプッシュ送信されたコンテンツデータのセグメントを受信する。受信装置１０２は、さらに、ユーザからの入力を受け付ける機能を備えてもよい。受信装置１０２の具体例は、スマートフォン装置、ＰＣ装置、テレビ、携帯電話、などの情報処理装置が挙げられるが、前述の機能構成を満たすものであればこれに限定されない。 The receiving device 102 has a content reproduction / display function and a communication function, and receives a segment of content data push-transmitted from the transmitting device 101. The receiving device 102 may further have a function of receiving input from the user. Specific examples of the receiving device 102 include information processing devices such as a smart phone device, a PC device, a television, and a mobile phone, but are not limited thereto as long as they satisfy the above-described functional configuration.
　ネットワーク１０３は、本実施形態におけるネットワークとしての有線ＬＡＮ（Ｌｏｃａｌ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）、または無線ＬＡＮ（Ｗｉｒｅｌｅｓｓ　ＬＡＮ）である。なお、本実施形態ではネットワーク１０３として有線ＬＡＮ、または無線ＬＡＮを利用しているが、これに限らず、ＷＡＮ（Ｗｉｄｅ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）、ＰＡＮ（Ｐｅｒｓｏｎａｌ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）などでもよい。また、ネットワーク１０３は、インターネット等の公衆通信網を経由するものでもよい。 The network 103 is a wired LAN (Local Area Network) or a wireless LAN (Wireless LAN) as a network in the present embodiment. In this embodiment, a wired LAN or a wireless LAN is used as the network 103. However, the present invention is not limited to this, and a WAN (Wide Area Network), a PAN (Personal Area Network), or the like may be used. Further, the network 103 may be one that passes through a public communication network such as the Internet.
　（送信装置の機能構成）
　図２は、本実施形態における送信装置の機能構成例を示すブロック図である。本実施形態の送信装置１０１は、撮像部２０１、符号化部２０２、セグメント生成部２０３、プレイリスト生成部２０４、セグメント決定部２０５、指示管理部２０６、及び、通信部２０７を有する。 (Functional configuration of transmitter)
FIG. 2 is a block diagram illustrating a functional configuration example of the transmission apparatus according to the present embodiment. The transmission apparatus 101 according to the present embodiment includes an imaging unit 201, an encoding unit 202, a segment generation unit 203, a playlist generation unit 204, a segment determination unit 205, an instruction management unit 206, and a communication unit 207.
　撮像部２０１は、撮影対象を撮影して、映像データを取得する。符号化部２０２は、撮像部２０１により撮影した映像データを符号化する。なお、撮像部２０１及び符号化部２０２は送信装置１０１の外部にあって、符号化された映像データが送信装置１０１に提供される構成にしてもよい。また、本実施形態において、映像データは動画像だけでなく、音声を含むデータである。なお、送受信対象のコンテンツは、このような映像データだけでなく、静止画像や、テキストデータ等を含む画像、あるいは、Ｊａｖａｓｃｒｉｐｔ（登録商標）等の受信装置１０２において実行されるプログラムコードを含む画像でもよい。 The image capturing unit 201 captures a subject to acquire video data. The encoding unit 202 encodes video data captured by the imaging unit 201. Note that the imaging unit 201 and the encoding unit 202 may be provided outside the transmission apparatus 101, and the encoded video data may be provided to the transmission apparatus 101. In the present embodiment, the video data is not only a moving image but also data including sound. The content to be transmitted / received is not only such video data but also an image including a still image, text data, or an image including a program code executed in the receiving device 102 such as Javascript (registered trademark). Good.
　セグメント生成部２０３は、符号化部２０２で符号化された映像データから映像データの送信単位であるセグメントを生成する。セグメントとは、映像データを空間的又は時間的に分割した映像データの単位をいう。本実施形態におけるセグメントのファイルフォーマットとしてはＩＳＯＢＭＦＦ（Ｂａｓｅ　Ｍｅｄｉａ　Ｆｉｌｅ　Ｆｏｒｍａｔ）を利用する例を説明するが、これに限らずＭＰＥＧ２ＴＳなどでもよい。プレイリスト生成部２０４は、セグメント生成部２０３が作成したセグメントへのアクセスを可能とするＵＲＬを記載したプレイリストを生成する。プレイリストのフォーマットとしてＭＰＥＧ－ＤＡＳＨで規定されているＭＰＤ（Ｍｅｄｉａ　Ｐｒｅｓｅｎｔａｔｉｏｎ　Ｄｅｓｃｒｉｐｔｉｏｎ）がある。ただし、これに限られるものではなく、Ｈｔｔｐ　Ｌｉｖｅｓｔｒｅａｍｉｎｇにおけるプレイリストの記述方法など、これと同等の機能を有するものでもよい。 The segment generation unit 203 generates a segment, which is a transmission unit of video data, from the video data encoded by the encoding unit 202. A segment is a unit of video data obtained by dividing video data spatially or temporally. An example of using ISOBMFF (Base Media File Format) will be described as a file format of a segment in the present embodiment, but is not limited thereto, and may be MPEG2TS or the like. The playlist generation unit 204 generates a playlist that describes a URL that allows access to the segment created by the segment generation unit 203. There is MPD (Media Presentation Description) defined by MPEG-DASH as a playlist format. However, the present invention is not limited to this, and it may have a function equivalent to this, such as a description method of a playlist in Http Livestreaming.
　通信部２０７は、受信装置１０２からの要求に応じて、生成されたプレイリスト及びセグメントをネットワーク１０３を介して受信装置１０２へ送信する。指示管理部（ＰＵＳＨ送信指示管理部）２０６は、通信部２０７が受信装置１０２から受信したＰＵＳＨ送信指示を保持し、またＰＵＳＨ（プッシュ）送信指示の内容をセグメント決定部２０５へ伝える。セグメント決定部（送信セグメント決定部）２０５は、通信部２０７がセグメント取得要求を受けた際に送信するセグメントを決定する。また、セグメント決定部２０５は、指示管理部２０６から受けるＰＵＳＨ送信指示の内容を元にＰＵＳＨ送信するセグメントを決定する。 The communication unit 207 transmits the generated playlist and segment to the receiving apparatus 102 via the network 103 in response to a request from the receiving apparatus 102. An instruction management unit (PUSH transmission instruction management unit) 206 holds the PUSH transmission instruction received by the communication unit 207 from the receiving apparatus 102 and transmits the content of the PUSH (push) transmission instruction to the segment determination unit 205. A segment determination unit (transmission segment determination unit) 205 determines a segment to be transmitted when the communication unit 207 receives a segment acquisition request. Further, the segment determination unit 205 determines a segment to perform PUSH transmission based on the content of the PUSH transmission instruction received from the instruction management unit 206.
　（受信装置の機能構成）
　図３は、本実施形態における受信装置の機能構成を示すブロック図である。本実施形態の受信装置１０２は、表示部３０１、復号化部３０２、プレイリスト解析部３０３、バッファ３０４、ユーザインタフェイス部３０５、指示管理部３０６、セグメント決定部３０７、通信部３０８を有する。 (Functional configuration of receiving device)
FIG. 3 is a block diagram illustrating a functional configuration of the receiving apparatus according to the present embodiment. The receiving apparatus 102 according to the present embodiment includes a display unit 301, a decoding unit 302, a playlist analysis unit 303, a buffer 304, a user interface unit 305, an instruction management unit 306, a segment determination unit 307, and a communication unit 308.
　通信部３０８は、ネットワーク１０３を介して送信装置１０１からセグメント及びプレイリストを受信し、セグメントをバッファ３０４に渡し、プレイリストをプレイリスト解析部３０３へ渡す。バッファ３０４は、通信部３０８から渡されたセグメントを蓄積して、一時的に保持する。復号化部３０２は、バッファ３０４に蓄積されているセグメントを元に映像データを復号化する。表示部３０１は、ネットワーク１０３を介して送信装置１０１から受信され、復号化部３０２において復号化された映像データの再生画像を表示したり、音声を出力したりする。なお、表示部３０１は、受信装置１０２の外部にあって、受信装置１０２から映像データを受け取って表示してもよい。 The communication unit 308 receives a segment and a playlist from the transmission apparatus 101 via the network 103, passes the segment to the buffer 304, and passes the playlist to the playlist analysis unit 303. The buffer 304 accumulates the segments passed from the communication unit 308 and temporarily holds them. The decoding unit 302 decodes the video data based on the segments accumulated in the buffer 304. The display unit 301 displays a playback image of video data received from the transmission device 101 via the network 103 and decoded by the decoding unit 302, or outputs audio. Note that the display unit 301 may be external to the receiving device 102 and receive and display video data from the receiving device 102.
　プレイリスト解析部３０３は、通信部３０８から渡されたプレイリストを解析する。ユーザインタフェイス部３０５は、ユーザが操作するための画面をディスプレイ５０８に表示するなどして、ユーザからの指示を入力する。例えば、送信装置１０１から受信したプレイリストを基に取得可能な映像の一覧を表示して、ユーザからの選択を受け付けたり、再生の一時停止、キャンセル等の指示を受け付けたりする。 The playlist analysis unit 303 analyzes the playlist passed from the communication unit 308. The user interface unit 305 inputs an instruction from the user by displaying a screen for the user to operate on the display 508. For example, a list of videos that can be acquired based on a playlist received from the transmission apparatus 101 is displayed, and a selection from the user is accepted, or an instruction to pause or cancel playback is accepted.
　セグメント決定部（取得セグメント決定部）３０７は、ユーザインタフェイス部３０５からの入力に基づき、プレイリスト解析部３０３からの解析結果を元に取得するセグメントを決定する。ただし、これに限らずネットワーク１０３の状況に応じてセグメント決定するなど、他の手法を利用してもよい。 The segment determination unit (acquisition segment determination unit) 307 determines a segment to be acquired based on the analysis result from the playlist analysis unit 303 based on the input from the user interface unit 305. However, the present invention is not limited to this, and other methods such as segment determination according to the status of the network 103 may be used.
　指示管理部（ＰＵＳＨ送信指示管理部）３０６は、プレイリスト解析部３０３からの解析結果を元にＰＵＳＨ送信指示を通信部３０８を介して送信し、送信したＰＵＳＨ送信指示を管理する。ただし、指示管理部３０６はプレイリスト解析部３０３の解析結果を参照せずにＰＵＳＨ送信指示を送信してもよいし、プレイリストの取得前にＰＵＳＨ送信指示を送信してもよい。指示管理部３０６はユーザインタフェイス部３０５からの入力に基づきＰＵＳＨ送信指示を送信するが、これに限らずネットワーク１０３の状況に応じて行うなど、他の手法を利用してもよい。 The instruction management unit (PUSH transmission instruction management unit) 306 transmits a PUSH transmission instruction via the communication unit 308 based on the analysis result from the playlist analysis unit 303, and manages the transmitted PUSH transmission instruction. However, the instruction management unit 306 may transmit the PUSH transmission instruction without referring to the analysis result of the playlist analysis unit 303, or may transmit the PUSH transmission instruction before acquiring the playlist. The instruction management unit 306 transmits a PUSH transmission instruction based on an input from the user interface unit 305. However, the instruction management unit 306 is not limited to this, and other methods such as performing according to the state of the network 103 may be used.
　（送信装置のハードウェア構成）
　図４は、本実施形態における送信装置１０１のハードウェア構成を表すブロック図である。中央処理装置（以下、ＣＰＵと称す）４０１は、装置全体を制御しデータの計算、加工を行う装置である。ＣＰＵ４０１は、後述するＲＯＭ４０２に格納されたコンピュータプログラムを後述するＲＡＭ４０３に展開して実行する。本実施形態では、ＣＰＵ４０１がコンピュータプログラムに基づき装置全体を制御することで、符号化部２０２、セグメント生成部２０３、プレイリスト生成部２０４、セグメント決定部２０５、及び、指示管理部２０６を実現する。 (Hardware configuration of transmitter)
FIG. 4 is a block diagram illustrating a hardware configuration of the transmission apparatus 101 according to the present embodiment. A central processing unit (hereinafter referred to as a CPU) 401 is a device that controls the entire device and calculates and processes data. The CPU 401 loads and executes a computer program stored in a ROM 402 described later on a RAM 403 described later. In this embodiment, the CPU 401 controls the entire apparatus based on a computer program, thereby realizing an encoding unit 202, a segment generation unit 203, a playlist generation unit 204, a segment determination unit 205, and an instruction management unit 206.
　ＲＯＭ４０２は読出し専用メモリであり、一度書き込まれた情報を読み出すための記憶装置である。本実施形態では、ＲＯＭ４０２は、図２で示された各機能部のコンピュータプログラムを格納する。ＲＡＭ４０３は書込み可能メモリであり、一時的にデータの書き込みと読み出しを行うための記憶装置である。ＲＡＭ４０３は、各プログラムの一時的な値の記憶を行う。 ROM 402 is a read-only memory, and is a storage device for reading information once written. In the present embodiment, the ROM 402 stores a computer program for each functional unit shown in FIG. A RAM 403 is a writable memory and is a storage device for temporarily writing and reading data. The RAM 403 stores temporary values for each program.
　内蔵メモリ４０４及び外部メモリ４０５は、アプリケーションのコンテンツを記憶しておく外部記憶装置である。内蔵メモリ４０４は、ＳＳＤ（ソリッドステートドライブ）やハードディスク等の内蔵されたストレージ装置である。外部メモリ４０５は、ＵＳＢメモリ、ＳＤメモリ等に代表されるフラッシュメモリ等の着脱可能なメモリ装置である。なお、図２の各機能を実現するためのコンピュータプログラムは、ＲＯＭ４０２ではなく、ＲＡＭ４０３、内蔵メモリ４０４、あるいは、外部メモリ４０５に記憶されていてもよい。 The internal memory 404 and the external memory 405 are external storage devices that store application contents. The built-in memory 404 is a built-in storage device such as an SSD (solid state drive) or a hard disk. The external memory 405 is a removable memory device such as a flash memory represented by a USB memory, an SD memory, or the like. 2 may be stored not in the ROM 402 but in the RAM 403, the built-in memory 404, or the external memory 405.
　入力装置４０６はユーザからの指示を入力する装置である。入力装置４０６は、電源ボタンや音量ボタン、ホームボタンなどを、機械的なボタンスイッチにより実装したものでもよいし、タッチパネル、キーボード、ポインティング装置等により実装したものでもよい。入力装置４０６は送信装置１０１に複数実装することができる。 The input device 406 is a device for inputting an instruction from the user. The input device 406 may include a power button, a volume button, a home button, and the like implemented by mechanical button switches, or may be implemented by a touch panel, a keyboard, a pointing device, or the like. A plurality of input devices 406 can be mounted on the transmission device 101.
　ネットワークＩ／Ｆ４０７は、ネットワーク１０３を介してデータの送受信をするための装置である。ネットワークＩ／Ｆ４０７は、通信部２０７を実現する。電源４０８は送信装置１０１に電源を供給／充電する装置であり、電池と充電装置を含む。なお、電源４０８は、ＡＣアダプタにより実現してもよい。カメラ４０９は送信用コンテンツを撮影する装置であり、撮像部２０１を実現する。 The network I / F 407 is a device for transmitting and receiving data via the network 103. The network I / F 407 implements the communication unit 207. The power source 408 is a device that supplies / charges power to the transmission device 101, and includes a battery and a charging device. The power source 408 may be realized by an AC adapter. The camera 409 is a device that captures content for transmission, and realizes the imaging unit 201.
　（受信装置のハードウェア構成）
　図５は、本実施形態における受信装置１０２のハードウェア構成を表すブロック図である。中央処理装置（以下、ＣＰＵと称す）５０１は、装置全体を制御しデータの計算、加工を行う装置である。ＣＰＵ５０１は、後述するＲＯＭ５０２に格納されたコンピュータプログラムを後述するＲＡＭ５０３に展開して実行する。本実施形態では、ＣＰＵ５０１がコンピュータプログラムに基づき装置全体を制御することで、復号化部３０２、プレイリスト解析部３０３、指示管理部３０６、及び、セグメント決定部３０７を実現する。 (Hardware configuration of receiving device)
FIG. 5 is a block diagram illustrating a hardware configuration of the receiving apparatus 102 according to the present embodiment. A central processing unit (hereinafter referred to as a CPU) 501 is a device that controls the entire apparatus to calculate and process data. The CPU 501 develops and executes a computer program stored in a ROM 502 described later on a RAM 503 described later. In the present embodiment, the CPU 501 controls the entire apparatus based on a computer program, thereby realizing a decryption unit 302, a playlist analysis unit 303, an instruction management unit 306, and a segment determination unit 307.
　ＲＯＭ５０２は読出し専用メモリであり、一度書き込まれた情報を読み出すための記憶装置である。本実施形態では、ＲＯＭ５０２は、図３で示された各機能部のコンピュータプログラムを格納する。ＲＡＭ５０３は書込み可能メモリであり、一時的にデータの書き込みと読み出すための記憶装置である。ＲＡＭ５０３は、各プログラムの一時的な値の記憶を行う。 ROM 502 is a read-only memory, and is a storage device for reading information once written. In the present embodiment, the ROM 502 stores a computer program for each functional unit shown in FIG. A RAM 503 is a writable memory and is a storage device for temporarily writing and reading data. The RAM 503 stores temporary values for each program.
　内蔵メモリ５０４及び外部メモリ５０６は、アプリケーションのコンテンツを記憶しておく外部記憶装置である。これらの装置は、バッファ３０４を実現する。なお、バッファ３０４はＲＡＭ５０３で実現してもよい。内蔵メモリ５０４、外部メモリ５０６の具体的な装置の例は、図４を参照して説明した送信装置１０１の内蔵メモリ４０４、外部メモリ４０５と同様である。 The internal memory 504 and the external memory 506 are external storage devices that store application contents. These devices implement a buffer 304. Note that the buffer 304 may be realized by the RAM 503. Specific examples of the internal memory 504 and the external memory 506 are the same as the internal memory 404 and the external memory 405 of the transmission apparatus 101 described with reference to FIG.
　入力装置５０５はユーザからの指示を入力する装置である。入力装置５０５は、電源ボタンや音量ボタン、ホームボタンなどを機械的なボタンスイッチにより実装したものでもよいし、タッチパネル、キーボード、ポインティング装置等により実装したものでもよい。入力装置５０５は受信装置１０２に複数実装することができる。入力装置５０５は、ユーザインタフェイス部３０５を実現する。 The input device 505 is a device for inputting an instruction from the user. The input device 505 may be a power button, a volume button, a home button, or the like mounted by a mechanical button switch, or may be mounted by a touch panel, a keyboard, a pointing device, or the like. A plurality of input devices 505 can be mounted on the receiving device 102. The input device 505 implements a user interface unit 305.
　スピーカー５０７及びディスプレイ５０８は、送信装置１０１から受信したコンテンツを再生する装置であり、表示部３０１を実現する。すなわち、スピーカー５０７は、受信したコンテンツに含まれる音声データを音声として出力する。ディスプレイ５０８は、受信したコンテンツに含まれる動画像データを画像として表示する。ネットワークＩ／Ｆ５０９は、ネットワークを介してデータの送受信をするための装置である。ネットワークＩ／Ｆ５０９は、通信部３０８を実現した装置である。電源５１０は受信装置１０２に電源を供給／充電する装置であり、電池と充電装置を含む。なお、電源５１０は、ＡＣアダプタにより実現してもよい。 The speaker 507 and the display 508 are devices that reproduce the content received from the transmission device 101, and realize the display unit 301. That is, the speaker 507 outputs audio data included in the received content as audio. The display 508 displays moving image data included in the received content as an image. A network I / F 509 is a device for transmitting and receiving data via a network. A network I / F 509 is a device that implements the communication unit 308. The power source 510 is a device that supplies / charges power to the receiving device 102 and includes a battery and a charging device. The power source 510 may be realized by an AC adapter.
　（送信装置の処理）
　図６を用いて本実施形態における送信装置１０１の処理について説明する。図６はＰＵＳＨ送信指示を受信してからＰＵＳＨ送信のキャンセルを行う迄における、本実施形態に係る送信装置１０１による処理の手順を示すフローチャートである。図６の各ステップは、ＣＰＵ４０１がコンピュータプログラムに基づき送信装置１０１を制御することにより実行される。 (Transmission device processing)
The process of the transmission apparatus 101 in this embodiment is demonstrated using FIG. FIG. 6 is a flowchart showing a procedure of processing performed by the transmission apparatus 101 according to the present embodiment from when a PUSH transmission instruction is received until PUSH transmission is canceled. Each step in FIG. 6 is executed by the CPU 401 controlling the transmission apparatus 101 based on the computer program.
　Ｓ６０１において、通信部２０７は、受信装置１０２からＰＵＳＨ送信指示を受信する。ここで、受信するＰＵＳＨ送信指示は一つでもよいし、複数のＰＵＳＨ送信指示を同時に受信してもよい。 In S <b> 601, the communication unit 207 receives a PUSH transmission instruction from the receiving device 102. Here, one PUSH transmission instruction may be received, or a plurality of PUSH transmission instructions may be received simultaneously.
　Ｓ６０２において、指示管理部２０６は、受信した各ＰＵＳＨ送信指示に対し、それぞれを区別するための識別子を割り振る。この識別子は数字や文字列などでもよいし、ＵＲＬ（Ｕｎｉｆｏｒｍ　Ｒｅｓｏｕｒｃｅ　Ｌｏｃａｔｏｒ）の様な形でもよい。あるいは、映像や音声といったセグメントのデータの種類を表す値を識別子として用いても良い。この識別子を受信装置１０２側で既に割り振っている場合、指示管理部２０６はＳ６０２をスキップして、受信装置１０２が割り振った識別子をそのまま使用するようにしてもよい。また、セグメントのデータの種類を識別子として使用する場合も新たに識別子を割り振る必要が無いためＳ６０２はスキップしてよい。また、ＰＵＳＨ送信指示を識別子以外で区別する場合もＳ６０２をスキップしてよい。ＰＵＳＨ送信指示は、識別子以外に、ＰＵＳＨ送信指示を受信装置１０２が送信した時刻や、後述するＳ６０３において送信装置１０１がＰＵＳＨ送信指示に対する応答を送信した時刻により区別してもよい。または受信装置１０２がＰＵＳＨ送信指示と合わせて、取得を行ったリソースにより区別してもよい。例えば、ＨＴＴＰ／２において、リソースとはＰＵＳＨ送信指示を出した際にＧＥＴしたセグメント名などである。また、これら以外にもＰＵＳＨ送信指示を区別して管理できる方法で実施してもよい。 In S602, the instruction management unit 206 allocates an identifier for distinguishing each received PUSH transmission instruction. This identifier may be a number or a character string, or may be in the form of a URL (Uniform Resource Locator). Alternatively, a value representing the type of segment data such as video or audio may be used as an identifier. When this identifier has already been allocated on the receiving apparatus 102 side, the instruction management unit 206 may skip S602 and use the identifier allocated by the receiving apparatus 102 as it is. Further, when the segment data type is used as an identifier, S602 may be skipped because there is no need to newly allocate an identifier. Also, S602 may be skipped when the PUSH transmission instruction is distinguished by other than the identifier. In addition to the identifier, the PUSH transmission instruction may be distinguished by the time when the reception apparatus 102 transmits the PUSH transmission instruction, or the time when the transmission apparatus 101 transmits a response to the PUSH transmission instruction in S603 described later. Alternatively, the receiving apparatus 102 may distinguish the acquired resources together with the PUSH transmission instruction. For example, in HTTP / 2, a resource is a segment name obtained when a PUSH transmission instruction is issued. Moreover, you may implement by the method which can distinguish and manage a PUSH transmission instruction | indication other than these.
　Ｓ６０３において、通信部２０７は、ＰＵＳＨ送信指示に対する応答を送信する。Ｓ６０２を実施している場合や受信装置１０２がＰＵＳＨ送信指示に識別子を割り振っている場合、つまり識別子によりＰＵＳＨ送信指示を区別する場合は応答に識別子を含めて送信する。識別子以外でＰＵＳＨ送信指示を区別する場合は、通信部２０７はＰＵＳＨ送信指示を区別するために必要な値を応答に含めて送信する。各値を応答に含める代わりに、プレイリスト生成部２０４がＭＰＤに各値を記載することにより受信装置１０２へ通知してもよい。 In S603, the communication unit 207 transmits a response to the PUSH transmission instruction. When S602 is implemented or when the receiving apparatus 102 allocates an identifier to the PUSH transmission instruction, that is, when the PUSH transmission instruction is distinguished by the identifier, the response is transmitted including the identifier. When differentiating the PUSH transmission instruction other than the identifier, the communication unit 207 transmits a response including a value necessary to distinguish the PUSH transmission instruction. Instead of including each value in the response, the playlist generating unit 204 may notify the receiving apparatus 102 by describing each value in the MPD.
　Ｓ６０４において、指示管理部２０６は、受信したＰＵＳＨ送信指示を保持しておく。識別子でＰＵＳＨ送信指示を区別する場合、ＰＵＳＨ送信指示と識別子を紐づけて保持する。セグメントのデータの種類を識別子として使用する際、セグメント名からデータの種類が分かる場合などでは、Ｓ６０４はスキップしても良い。識別子以外でＰＵＳＨ送信指示を区別する場合は、ＰＵＳＨ送信指示を区別するための値と紐づけてＰＵＳＨ送信指示を保持する。 In S604, the instruction management unit 206 holds the received PUSH transmission instruction. When distinguishing the PUSH transmission instruction by the identifier, the PUSH transmission instruction and the identifier are associated and held. When the data type of the segment is used as an identifier, S604 may be skipped if the data type is known from the segment name. When differentiating the PUSH transmission instruction other than the identifier, the PUSH transmission instruction is held in association with a value for distinguishing the PUSH transmission instruction.
　Ｓ６０５において、セグメント決定部２０５は、受信したＰＵＳＨ送信指示の内容を元にＰＵＳＨ送信するセグメントを決定し、決定したセグメントのリストを指示管理部２０６へ通知する。その後、通信部２０７は、対象のセグメントをＰＵＳＨ送信する。ライブ配信時の場合は、ＰＵＳＨ対象のセグメントのうち、生成完了したものからＰＵＳＨ送信していく。なお、Ｓ６０３、Ｓ６０４及びＳ６０５は本フローチャートと異なる順番で実施してもよい。 In S605, the segment determination unit 205 determines a segment to be PUSH transmitted based on the content of the received PUSH transmission instruction, and notifies the instruction management unit 206 of the determined segment list. Thereafter, the communication unit 207 performs PUSH transmission of the target segment. In the case of live distribution, PUSH transmission is performed from the PUSH target segment that has been generated. Note that S603, S604, and S605 may be performed in an order different from the flowchart.
　Ｓ６０６において、通信部２０７は、ＰＵＳＨ送信キャンセル指示を受信装置１０２から受信する。ここで受信するＰＵＳＨ送信キャンセル指示は一つのＰＵＳＨ送信指示を対象にしたものでもよいし、複数のＰＵＳＨ送信指示を対象にしたものでもよい。またＰＵＳＨ送信キャンセル指示は、ＰＵＳＨ送信指示によりＰＵＳＨする予定の全てのセグメントのキャンセルを指示する内容でもよいし、ＰＵＳＨ送信指示によりＰＵＳＨするセグメントのうち一部のセグメントのみのキャンセルを指示する内容でもよい。 In S606, the communication unit 207 receives a PUSH transmission cancel instruction from the receiving device 102. The PUSH transmission cancel instruction received here may be directed to one PUSH transmission instruction, or may be directed to a plurality of PUSH transmission instructions. The PUSH transmission cancel instruction may be a content instructing cancellation of all segments scheduled to be pushed by the PUSH transmission instruction, or may be content instructing cancellation of only a part of the segments to be pushed by the PUSH transmission instruction. .
　次に、ＰＵＳＨキャンセル対象であるＰＵＳＨ送信指示が一つの場合、そのＰＵＳＨ送信指示に基づきＰＵＳＨ送信すべきセグメントのうち、キャンセル候補となるセグメント毎にＳ６０７からＳ６１０の処理を順に行う。キャンセル候補についてはＳ６０７の説明にて後述する。またＰＵＳＨキャンセル対象のＰＵＳＨ送信指示が複数の場合、ＰＵＳＨ送信指示毎にＳ６０７からＳ６１１の処理を行う。例えば、ＰＵＳＨ送信キャンセル指示の対象がＰＵＳＨ送信指示Ａ及びＢであり、ＰＵＳＨ送信指示Ａのキャンセル候補セグメントは二つ、Ｂのキャンセル候補セグメントはと三つとする。この場合、まず対象のＰＵＳＨ送信指示の一つであるＡについてＳ６０７からＳ６１１の処理を実行する。その際、キャンセル候補セグメントの数である二回分Ｓ６０７からＳ６１０を順に行う。その後、もう一つのキャンセル対象であるＰＵＳＨ送信指示ＢについてＳ６０７からＳ６１１を実行する。その際キャンセル候補セグメントの数である三回分Ｓ６０７からＳ６１０を順に行う。Ｓ６０７からＳ６１０による各セグメントに対する処理は、キャンセル対象のＰＵＳＨ送信指示毎に並列に行われてもよい。 Next, when there is one PUSH transmission instruction to be PUSH canceled, the processes from S607 to S610 are performed in order for each segment to be canceled among the segments to be PUSH transmitted based on the PUSH transmission instruction. Cancellation candidates will be described later in the description of S607. Further, when there are a plurality of PUSH transmission instructions for PUSH cancellation, the processing from S607 to S611 is performed for each PUSH transmission instruction. For example, PUSH transmission instruction A and B are subject to PUSH transmission cancellation instructions, and there are two cancellation candidate segments for PUSH transmission instruction A and three cancellation candidate segments for B. In this case, first, the process from S607 to S611 is executed for A which is one of the target PUSH transmission instructions. At that time, S607 to S610 for the number of cancel candidate segments, which are twice, are performed in order. After that, S607 to S611 are executed for the PUSH transmission instruction B that is another cancellation target. At that time, S607 to S610 for three times that are the number of cancel candidate segments are sequentially performed. The processing for each segment from S607 to S610 may be performed in parallel for each PUSH transmission instruction to be canceled.
　Ｓ６０７において、指示管理部２０６は、ＰＵＳＨ送信キャンセル指示が対象としているＰＵＳＨ送信指示のうち、一つのＰＵＳＨ送信指示によりＰＵＳＨするセグメントの中からキャンセル候補となるセグメントを一つ特定する。例えば、あるＰＵＳＨ送信指示によりｓｅｇｍｅｎｔ１、ｓｅｇｍｅｎｔ２、ｓｅｇｍｅｎｔ３についてＰＵＳＨ送信することになっているとする。そして、ＰＵＳＨ送信キャンセル指示が全てのセグメントをキャンセルするよう求めてきたとする。この場合、キャンセル候補のセグメントはｓｅｇｍｅｎｔ１、ｓｅｇｍｅｎｔ２、ｓｅｇｍｅｎｔ３の三つ全てであり、Ｓ６０７で指示管理部２０６はその中の一つ（例えば、ｓｅｇｍｅｎｔ１）を選択する。一方でＰＵＳＨ送信キャンセル指示が最後一つのセグメントのみの場合、キャンセル候補のセグメントはｓｅｇｍｅｎｔ３のみであり、必然的にｓｅｇｍｅｎｔ３が選択される。なお、複数のセグメントを対象としてＰＵＳＨ送信キャンセルが指示された場合に、その一部のセグメントが既に送信済みであるか送信キャンセル済みのときは、それらのセグメントを除いたセグメントをキャンセル候補のセグメントとする。例えば、ＰＵＳＨ送信キャンセルの対象がｓｅｇｍｅｎｔ１～ｓｅｇｍｅｎｔ３の三つの場合で、ｓｅｇｍｅｎｔ１が送信済みで、ｓｅｇｍｅｎｔ２が送信キャンセル済みの場合は、ｓｅｇｍｅｎｔ３のみをＰＵＳＨ送信キャンセルの候補とする。 In S607, the instruction management unit 206 identifies one segment that is a cancel candidate from among the PUSH transmission instructions targeted by the PUSH transmission cancellation instruction, from among the segments to be pushed by one PUSH transmission instruction. For example, it is assumed that PUSH transmission is to be performed for segment1, segment2, and segment3 according to a certain PUSH transmission instruction. Assume that the PUSH transmission cancel instruction asks to cancel all segments. In this case, the cancellation candidate segments are all three segments, segment1, segment2, and segment3, and in step S607, the instruction management unit 206 selects one of them (for example, segment1). On the other hand, when the PUSH transmission cancellation instruction is only the last segment, the cancellation candidate segment is only segment3, and segment3 is inevitably selected. In addition, when PUSH transmission cancellation is instructed for a plurality of segments, if some of the segments have already been transmitted or have been canceled, the segments excluding those segments are regarded as cancellation candidate segments. To do. For example, when PUSH transmission cancellation targets are segment1 to segment3, segment1 has been transmitted, and segment2 has been cancelled, only segment3 is a candidate for PUSH transmission cancellation.
　Ｓ６０８により、指示管理部２０６は、Ｓ６０７で特定したキャンセル候補のセグメントが、他のＰＵＳＨ送信指示によるＰＵＳＨ送信対象になっていないことを確認する。例えば、あるＰＵＳＨ送信指示（以下、「指示１」と称する）によりｓｅｇｍｅｎｔ１、ｓｅｇｍｅｎｔ２、ｓｅｇｍｅｎｔ３をＰＵＳＨ送信することになっているとする。また、指示１において、ＰＵＳＨ送信キャンセル指示によるキャンセル候補のセグメントの一つがｓｅｇｍｅｎｔ３であるとする。一方で、別のＰＵＳＨ送信指示（以下、「指示２」と称する）によるＰＵＳＨ送信予定セグメントがｓｅｇｍｅｎｔ３、ｓｅｇｍｅｎｔ４となっているとする。この場合、ｓｅｇｍｅｎｔ３が指示２によりＰＵＳＨ送信予定になっているため、指示１の処理においてｓｅｇｍｅｎｔ３のＰＵＳＨ送信はキャンセルしてはいけないということになる。なお、キャンセル対象のＰＵＳＨ送信指示以外に別のＰＵＳＨ送信指示が受信装置１０２から指示されていない場合、Ｓ６０８はスキップしＳ６０９へ遷移してもよい。 In S608, the instruction management unit 206 confirms that the cancel candidate segment specified in S607 is not a PUSH transmission target according to another PUSH transmission instruction. For example, it is assumed that segment1, segment2, and segment3 are to be PUSH-transmitted according to a certain PUSH transmission instruction (hereinafter referred to as “instruction 1”). Also, in instruction 1, it is assumed that one of the cancel candidate segments according to the PUSH transmission cancel instruction is segment3. On the other hand, it is assumed that the PUSH transmission scheduled segments based on another PUSH transmission instruction (hereinafter referred to as “instruction 2”) are segment3 and segment4. In this case, since segment 3 is scheduled to be PUSH transmitted according to instruction 2, the PUSH transmission of segment 3 must not be canceled in the process of instruction 1. If no other PUSH transmission instruction is instructed from the receiving apparatus 102 other than the PUSH transmission instruction to be canceled, S608 may be skipped and the process may proceed to S609.
　Ｓ６０８にて、Ｓ６０７で特定したキャンセル候補のセグメントが、他のＰＵＳＨ送信指示によるＰＵＳＨ送信対象になっていないと判定した場合（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。Ｓ６０８にて、Ｓ６０７で特定したキャンセル候補のセグメントが、他のＰＵＳＨ送信指示によるＰＵＳＨ送信対象になっていると判定した場合（Ｓ６０８でＹＥＳ）、Ｓ６１０へ遷移する。 In S608, when it is determined that the cancel candidate segment specified in S607 is not a PUSH transmission target according to another PUSH transmission instruction (NO in S608), the process proceeds to S609. In S608, when it is determined that the cancel candidate segment specified in S607 is a PUSH transmission target according to another PUSH transmission instruction (YES in S608), the process proceeds to S610.
　Ｓ６０９において、指示管理部２０６は、セグメント決定部２０５へキャンセル候補のセグメントのＰＵＳＨ送信をキャンセルするよう指示を出す。それに応じて、セグメント決定部２０５は、キャンセル候補セグメントのＰＵＳＨ送信をキャンセルする。 In step S609, the instruction management unit 206 instructs the segment determination unit 205 to cancel the PUSH transmission of the cancel candidate segment. In response, the segment determination unit 205 cancels the PUSH transmission of the cancel candidate segment.
　Ｓ６０８からＳ６０９のキャンセル可能かのチェック及びキャンセル処理は、一つのＰＵＳＨ送信指示によりＰＵＳＨ送信するセグメントの中で、全てのキャンセル候補セグメントに対し行う。そこで、Ｓ６１０にて、処理対象の一つのＰＵＳＨ送信指示についての全てのキャンセル候補のセグメントについて、Ｓ６０８からＳ６０９の処理が行われたか否かを判定する。全てのキャンセル候補セグメントに対しＳ６０８からＳ６０９の処理が行われたと判定された場合（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。Ｓ６１０にて、全てのキャンセル候補セグメントに対しＳ６０８からＳ６０９の処理を行っていないと判定した場合（Ｓ６１０でＮＯ）、Ｓ６０７へ遷移して、処理を行っていないキャンセル候補セグメントに対して前述のキャンセル処理を行う。 The check whether or not cancellation is possible from S608 to S609 and the cancellation process are performed for all cancel candidate segments among the segments to be PUSH transmitted by one PUSH transmission instruction. Therefore, in S610, it is determined whether or not the processing from S608 to S609 has been performed for all cancel candidate segments for one PUSH transmission instruction to be processed. If it is determined that the processing from S608 to S609 has been performed for all cancel candidate segments (YES in S610), the process proceeds to S611. If it is determined in S610 that the processing from S608 to S609 has not been performed for all the cancellation candidate segments (NO in S610), the process proceeds to S607 and the above-described cancellation is performed for the cancellation candidate segment that has not been processed. Process.
　Ｓ６０７からＳ６１０の処理は、一つのＰＵＳＨ送信指示によりＰＵＳＨ送信するセグメントのうち、一つのキャンセル候補セグメントごとに実施する。なおＳ６０７で最初に全てのＰＵＳＨ送信指示の全てのキャンセル候補セグメントを特定しておき、その後特定したキャンセル候補セグメント毎にＳ６０８からＳ６１０を実施するようにしてもよい。 The processing from S607 to S610 is performed for each cancel candidate segment among the segments to be PUSH transmitted by one PUSH transmission instruction. Note that in S607, all cancel candidate segments of all PUSH transmission instructions may be specified first, and then S608 to S610 may be performed for each specified cancel candidate segment.
　Ｓ６１１では、ＰＵＳＨ送信のキャンセルを指示しているすべてのＰＵＳＨ送信指示についてＳ６０７からＳ６１０の処理を行ったか否かを判定する。キャンセル対象になっている全てのＰＵＳＨ送信指示についてＳ６０７からＳ６１０のキャンセル処理を行ったと判定した場合（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。全てのＰＵＳＨ送信指示についてＳ６０７からＳ６１０のキャンセル処理を行っていない判定した場合（Ｓ６１１でＮＯ）、Ｓ６０７へ遷移して、未処理のＰＵＳＨ送信指示について前述のキャンセル処理を行う。 In S611, it is determined whether or not the processing from S607 to S610 has been performed for all PUSH transmission instructions instructing cancellation of PUSH transmission. If it is determined that the cancellation processing from S607 to S610 has been performed for all PUSH transmission instructions that are to be canceled (YES in S611), the processing proceeds to S612. If it is determined that the cancellation process from S607 to S610 has not been performed for all the PUSH transmission instructions (NO in S611), the process proceeds to S607 and the above-described cancellation process is performed for an unprocessed PUSH transmission instruction.
　Ｓ６０７からＳ６１１のキャンセル方法は、本説明に記載した方法に限定されない。例えば、セグメントが別のＰＵＳＨ送信指示からのＰＵＳＨ送信対象になっているかに関わらず、あるＰＵＳＨ送信指示のキャンセル候補になった時点で、そのセグメントのＰＵＳＨ送信をキャンセルをするなど、別の方法を用いてもよい。 The cancellation method from S607 to S611 is not limited to the method described in this description. For example, regardless of whether a segment is a PUSH transmission target from another PUSH transmission instruction, when a certain PUSH transmission instruction is canceled, another method such as canceling the PUSH transmission of that segment is used. It may be used.
　Ｓ６１２にて、通信部２０７はＰＵＳＨ送信キャンセル指示に対する応答を受信装置１０２へ送信する。 In S612, the communication unit 207 transmits a response to the PUSH transmission cancel instruction to the receiving apparatus 102.
　（受信装置の処理）
　図７を用いて本実施形態における受信装置１０２の処理について説明する。図７はＰＵＳＨ送信指示の送信を行い、その後ＰＵＳＨ送信のキャンセルを行う迄における、本実施形態に係る受信装置１０２による処理の手順を示すフローチャートである。図７の各ステップは、ＣＰＵ５０１がコンピュータプログラムに基づき受信装置１０２を制御することにより実行される。 (Receiver processing)
Processing of the receiving apparatus 102 in this embodiment will be described using FIG. FIG. 7 is a flowchart showing a procedure of processing performed by the receiving apparatus 102 according to the present embodiment until transmission of a PUSH transmission instruction and subsequent cancellation of PUSH transmission. Each step in FIG. 7 is executed by the CPU 501 controlling the receiving apparatus 102 based on the computer program.
　Ｓ７０１において、指示管理部３０６は、送信しようとする各ＰＵＳＨ送信指示に対し、それぞれを区別するための識別子を割り振る。この識別子は数字や文字列などでもよいし、ＵＲＬの様な形でもよい。あるいは、映像や音声といったセグメントのデータの種類を表す値を識別子として用いても良い。セグメントのデータの種類を識別子として使用する際、セグメント名からデータの種類が分かる場合などでは、Ｓ７０１はスキップしても良い。この識別子は送信装置１０１が割り振ることもでき、その場合Ｓ７０１はスキップしてよい。またＰＵＳＨ送信指示を識別子以外で区別する場合もＳ７０１をスキップしてよい。 In S701, the instruction management unit 306 allocates an identifier for distinguishing each PUSH transmission instruction to be transmitted. This identifier may be a number, a character string, or the like, or may be in the form of a URL. Alternatively, a value representing the type of segment data such as video or audio may be used as an identifier. When the segment data type is used as an identifier, S701 may be skipped if the data type is known from the segment name. This identifier can also be allocated by the transmission apparatus 101, and in this case, S701 may be skipped. Further, S701 may be skipped when the PUSH transmission instruction is distinguished by other than the identifier.
　Ｓ７０２において、通信部３０８は、ＰＵＳＨ送信指示を送信装置１０１へ送信する。ここで送信するＰＵＳＨ送信指示は一つでもよいし、複数のＰＵＳＨ送信指示を同時に送信してもよい。Ｓ７０１にて識別子を振っている場合は、各ＰＵＳＨ送信指示に識別子を含めて送信する。 In step S <b> 702, the communication unit 308 transmits a PUSH transmission instruction to the transmission apparatus 101. One PUSH transmission instruction may be transmitted here, or a plurality of PUSH transmission instructions may be transmitted simultaneously. When the identifier is waved in S701, the identifier is included in each PUSH transmission instruction and transmitted.
　Ｓ７０３において、通信部３０８は、ＰＵＳＨ送信指示に対する送信装置１０１からの応答を受信する。この応答は、図６のＳ６０３のステップにより送信装置１０１から送信される。 In S703, the communication unit 308 receives a response from the transmission apparatus 101 to the PUSH transmission instruction. This response is transmitted from the transmission apparatus 101 in step S603 of FIG.
　Ｓ７０４にて、指示管理部３０６は、送信装置１０１から受信したＰＵＳＨ送信指示の応答を保持しておく。 In step S704, the instruction management unit 306 holds the PUSH transmission instruction response received from the transmission apparatus 101.
　Ｓ７０５において、通信部３０８は送信装置１０１からＰＵＳＨ送信されるセグメントを受信する。受信したセグメントはバッファ３０４に蓄積され、復号化部３０２において復号されて、表示部３０１により表示／出力される。 In step S <b> 705, the communication unit 308 receives a segment transmitted by PUSH from the transmission apparatus 101. The received segment is stored in the buffer 304, decoded by the decoding unit 302, and displayed / output by the display unit 301.
　Ｓ７０６において、通信部３０８はＰＵＳＨ送信キャンセル指示を送信する。Ｓ７０５にてＰＵＳＨ送信セグメントを受信する前に本ステップを実行してもよい。送信するＰＵＳＨ送信キャンセル指示の対象は、一つのＰＵＳＨ送信指示でもよいし、複数のＰＵＳＨ送信指示を対象にしたものでもよい。また、ＰＵＳＨ送信キャンセル指示は、ＰＵＳＨ送信指示によりＰＵＳＨされる予定の全てのセグメントのキャンセルを指示する内容でもよい。あるいは、ＰＵＳＨ送信指示によりＰＵＳＨされるセグメントのうち一部のセグメントのみのキャンセルを指示する内容でもよい。 In S706, the communication unit 308 transmits a PUSH transmission cancel instruction. This step may be executed before receiving the PUSH transmission segment in S705. The PUSH transmission cancel instruction to be transmitted may be one PUSH transmission instruction or a plurality of PUSH transmission instructions. Further, the PUSH transmission cancel instruction may be a content instructing cancellation of all the segments scheduled to be pushed by the PUSH transmission instruction. Or the content which instruct | indicates the cancellation of only a part of segment among the segments pushed by PUSH transmission instruction | indication may be sufficient.
　なお、Ｓ７０６におけるＰＵＳＨ送信キャンセル指示の送信のトリガーは、ユーザによる指示でも良いし、送信装置１０１と受信装置１０２を接続する通信路の帯域の状態変化でも良いし、送信装置１０１及び／又は受信装置１０２の状態の変化でも良い。また、ＰＵＳＨ送信キャンセル指示は、受信装置１０２において実行されるウェブブラウザからのメッセージのヘッダに含まれるようにしても良いし、ウェブブラウザとは別のアプリケーションからのメッセージに含まれるようにしても良い。 The transmission trigger of the PUSH transmission cancel instruction in S706 may be an instruction by the user, a state change of a band of a communication path connecting the transmission apparatus 101 and the reception apparatus 102, or the transmission apparatus 101 and / or the reception apparatus. A change in the state of 102 may be used. The PUSH transmission cancel instruction may be included in a header of a message from a web browser executed in the receiving apparatus 102, or may be included in a message from an application different from the web browser. .
　また、通信部３０８により送信されるＰＵＳＨ送信キャンセル指示には、ＰＵＳＨ送信指示の指定を含む。この指定は、Ｓ６０２の説明において述べたように、ＰＵＳＨ送信指示に対して割り振られた識別子を用いて実現しても良いし、時刻情報を用いて実現しても良い。時刻情報には、ＰＵＳＨ送信指示を受信装置１０２が送信した時刻でも良いし、送信装置１０１がＰＵＳＨ送信指示に対してレスポンスを送信した時刻でも良いし、それ以外の時刻に関する情報を用いても良い。さらに、上記指定は、ＰＵＳＨ送信指示によってプッシュ送信される対象となるデータの種類（映像データか、音声データか、又はそれ以外か、など）を識別するための情報に基づいて実現されるようにしてもよい。 Also, the PUSH transmission cancel instruction transmitted by the communication unit 308 includes designation of the PUSH transmission instruction. As described in the description of S602, this designation may be realized using an identifier assigned to the PUSH transmission instruction, or may be realized using time information. The time information may be the time at which the receiving apparatus 102 transmits the PUSH transmission instruction, the time at which the transmitting apparatus 101 transmits a response to the PUSH transmission instruction, or information about other times may be used. . Further, the above specification is realized based on information for identifying the type of data (video data, audio data, or other data) to be push-transmitted by the PUSH transmission instruction. May be.
　また、詳細は後述するが、ＰＵＳＨ送信指示を指定する代わりに、プッシュ送信の対象となるメディアセグメントを指定するＰＵＳＨ送信キャンセル指示が通信部３０８によって送信されるようにしても良い。また、ＰＵＳＨ送信指示の指定やメディアセグメントの指定のために、ＵＲＬを用いても良い。このように、通信部３０８は、プッシュ送信をキャンセルすべきメディアセグメントを送信装置１０１が特定するための識別情報（例えば、ＰＵＳＨ送信指示の識別子や、時刻情報や、データの種類、または、ＰＵＳＨ送信指示やメディアセグメントを指定するためのＵＲＬなど）をＰＵＳＨ送信キャンセル指示に含めて送信する。 As will be described in detail later, instead of specifying a PUSH transmission instruction, a PUSH transmission cancellation instruction that specifies a media segment to be subjected to push transmission may be transmitted by the communication unit 308. Further, a URL may be used for specifying a PUSH transmission instruction and a media segment. As described above, the communication unit 308 identifies identification information (for example, an identifier of a PUSH transmission instruction, time information, a data type, or a PUSH transmission for specifying a media segment for which push transmission should be canceled). An instruction or a URL for designating a media segment) is included in the PUSH transmission cancel instruction and transmitted.
　Ｓ７０７において、通信部３０８はＰＵＳＨ送信キャンセル指示に対する応答を受信する。この応答は、図６のＳ６１２のステップにより送信装置１０１から送信される。 In S707, the communication unit 308 receives a response to the PUSH transmission cancel instruction. This response is transmitted from the transmission apparatus 101 in step S612 of FIG.
　上記のように、送信装置１０１は、少なくとも１つのセグメントのプッシュ送信を指示するためのプッシュ送信指示を受信装置１０２から受信すると、それに応じて、各セグメントを受信装置１０２へプッシュ送信するように制御する。送信装置１０１は、セグメントのプッシュ送信をキャンセルするための、プッシュ送信指示の指定を含むキャンセル指示を受信装置１０２から受信した場合、指定されたプッシュ送信指示に基づく未送信のセグメントのプッシュ送信を停止する。このように本実施形態では、プッシュ送信指示を指定してプッシュ送信をキャンセルすることで、ＨＴＴＰ／２やＷｅｂＳｏｃｋｅｔなどの利用する通信プロトコルにかかわらず、最小限のトランザクション回数でプッシュ送信をキャンセルすることが可能である。 As described above, when the transmission apparatus 101 receives a push transmission instruction for instructing push transmission of at least one segment from the reception apparatus 102, the transmission apparatus 101 is controlled to push each segment to the reception apparatus 102 accordingly. To do. When the transmitting apparatus 101 receives a cancel instruction including the designation of the push transmission instruction for canceling the push transmission of the segment from the receiving apparatus 102, the transmitting apparatus 101 stops the push transmission of the untransmitted segment based on the designated push transmission instruction. To do. As described above, in this embodiment, by specifying the push transmission instruction and canceling the push transmission, the push transmission can be canceled with the minimum number of transactions regardless of the communication protocol used such as HTTP / 2 or WebSocket. Is possible.
　前述のように、プッシュ送信指示の指定は、例えば、プッシュ送信指示の識別子や、あるいは、プッシュ送信指示の内容と、受信装置１０２により要求されたリソース又はプッシュ送信指示の送受信に関する時刻との組み合わせにより行うことができる。また、送信装置１０１が、受信したキャンセル指示の内容に応じて、未送信のセグメントの全て又は一部のプッシュ送信を停止することで、受信装置１０２は、所望のセグメントの送信を事後的にキャンセルすることができる。 As described above, the designation of the push transmission instruction is performed by, for example, combining the identifier of the push transmission instruction or the content of the push transmission instruction with the resource requested by the receiving apparatus 102 or the time related to transmission / reception of the push transmission instruction. It can be carried out. Further, the transmission apparatus 101 stops the push transmission of all or a part of the untransmitted segments according to the content of the received cancellation instruction, so that the reception apparatus 102 cancels the transmission of the desired segment later. can do.
　また、送信装置１０１は、複数のプッシュ送信指示を受信してセグメントをプッシュ送信している場合に、あるプッシュ送信指示についてキャンセル指示を受信したときは、Ｓ６０８において、他のプッシュ送信指示の送信対象はキャンセル対象から除外する。すなわち、キャンセル指示に指定されたプッシュ送信指示に基づく未送信のセグメントの全ての送信を停止するのではなく、他のプッシュ送信指示に基づく未送信のセグメントに含まれないセグメントについてのみ送信を停止する。これにより、セグメントのプッシュ配信において、受信装置１０２のユーザが意図しないキャンセルが発生することを防ぐことができる。 In addition, when the transmission apparatus 101 receives a plurality of push transmission instructions and pushes a segment and receives a cancel instruction for a certain push transmission instruction, in S608, the transmission apparatus 101 transmits another push transmission instruction. Are excluded from cancellation. That is, instead of stopping all transmissions of unsent segments based on the push transmission instruction specified in the cancel instruction, transmission is stopped only for segments not included in the unsent segments based on other push transmission instructions. . Thereby, in the push distribution of the segment, it is possible to prevent a cancel that is not intended by the user of the receiving apparatus 102 from occurring.
　（動作例１）
　ＨＴＴＰ／２上で、ＵＲＬ形式の識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定全てのセグメントをキャンセルする例について、図８Ａ、図８Ｂを参照して説明する。図８Ａ、図８Ｂは送信装置１０１と受信装置１０２との間でやり取りされるリクエスト、レスポンスメッセージの例を示す概略図である。ここでは、受信装置１０２から送信装置１０１へ送信するデータをリクエスト、送信装置１０１から受信装置１０２へ送信するデータをレスポンスと称する。図８Ａの上部のメッセージから下部のメッセージへ順にやり取りが行われ、次に図８Ｂの上部のメッセージから下部のメッセージがやり取りされる。つまり、リクエスト８０１から、８０３、８０６、８０７、８０８、８０９、８１１、８１３の順でやり取りされる。以降の図９Ａ～図１７Ｂも同様の構成となる。ここでは、識別子は送信装置１０１が割り振るものとしてＳ７０１はスキップする。 (Operation example 1)
An example of designating a PUSH transmission instruction to be canceled by an identifier in the URL format on HTTP / 2 and canceling all segments scheduled to be pushed by the PUSH transmission instruction will be described with reference to FIGS. 8A and 8B. 8A and 8B are schematic diagrams illustrating examples of requests and response messages exchanged between the transmission apparatus 101 and the reception apparatus 102. FIG. Here, data transmitted from the receiving apparatus 102 to the transmitting apparatus 101 is referred to as a request, and data transmitted from the transmitting apparatus 101 to the receiving apparatus 102 is referred to as a response. The messages are exchanged in order from the upper message in FIG. 8A to the lower message, and then the lower message is exchanged from the upper message in FIG. 8B. That is, the requests 801 are exchanged in the order of 803, 806, 807, 808, 809, 811, 813. Subsequent FIGS. 9A to 17B have the same configuration. Here, the identifier is assigned by the transmission apparatus 101, and step S701 is skipped.
　Ｓ７０２において、受信装置１０２の通信部３０８は、送信装置１０１へＰＵＳＨ送信指示８０２をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト８０１を送信する。リクエスト８０１はｓｅｇｍｅｎｔＡ１というセグメントをリクエストする内容を有する。リクエスト８０１はさらに、ｓｅｇｍｅｎｔＡ１から再生時間的に連続する次の五つのセグメントｓｅｇｍｅｎｔＡ２～ｓｅｇｍｅｎｔＡ６をＰＵＳＨ送信するようＰＵＳＨ送信指示８０２で指示している。８０２において、"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｎｅｘｔ"に続く数字"５"は、"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"に続いて取得するセグメントの個数を指定したものである。Ｓ６０１において、送信装置１０１の通信部２０７はＰＵＳＨ送信指示８０２を含むリクエスト８０１を受信する。 In S <b> 702, the communication unit 308 of the reception apparatus 102 transmits a request 801 including the PUSH transmission instruction 802 in the accept-push-policy header to the transmission apparatus 101. The request 801 has a content for requesting a segment called segmentA1. The request 801 further instructs the PUSH transmission instruction 802 to PUSH transmit the next five segments segmentA2 to segmentA6 continuous from the segmentA1 in terms of playback time. In 802, the number “5” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / tmp / segmentA1”. In step S <b> 601, the communication unit 207 of the transmission apparatus 101 receives a request 801 including a PUSH transmission instruction 802.
　Ｓ６０２において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示８０２に対し"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ１"という識別子８０５を割り振る。動作例１では、識別子はＵＲＬの形式を採用している。 In S602, the instruction management unit 206 of the transmission device 101 allocates an identifier 805 of “/ example / tmp / push1” to the received PUSH transmission instruction 802. In the operation example 1, the identifier adopts the URL format.
　Ｓ６０３において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示８０２に対する応答として、ＰＵＳＨ送信指示８０２と同内容のＰＵＳＨ送信指示の応答８０４をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス８０３を受信装置１０２へ送信する。レスポンス８０３のｐｕｓｈ－ｐｏｌｉｃｙヘッダーには、ＰＵＳＨ送信指示の応答８０４と対応させて識別子８０５も含める。識別子８０５の前に"ｐｕｓｈ－ＵＲＬ"というプレフィックスを入れることで、ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのどこからが識別子８０５なのかを分かるようにしている。このプレフィックスは"ｐｕｓｈ－ＵＲＬ"に限定しない。識別子８０５をＰＵＳＨ送信指示の応答８０４と共に送信する代わりに、送信装置１０１はＭＰＤに識別子８０５を記載し受信装置１０２へ通知してもよい。 In step S <b> 603, the communication unit 207 of the transmission apparatus 101 transmits, to the reception apparatus 102, a response 803 including a PUSH transmission instruction response 804 having the same content as the PUSH transmission instruction 802 in the push-policy header as a response to the PUSH transmission instruction 802. . The push-policy header of the response 803 includes an identifier 805 in association with the PUSH transmission instruction response 804. By inserting a prefix “push-URL” in front of the identifier 805, it is possible to know where the identifier 805 is from the push-policy header. This prefix is not limited to “push-URL”. Instead of transmitting the identifier 805 together with the PUSH transmission instruction response 804, the transmitting apparatus 101 may describe the identifier 805 in the MPD and notify the receiving apparatus 102.
　レスポンス８０３を送信後、送信装置１０１はＨＴＴＰ／２における、ＰＵＳＨ送信予定のｓｅｇｍｅｎｔＡ２とｓｅｇｍｅｎｔＡ３について、それぞれどのｓｔｒｅａｍで送信するかを予約するためのＰＵＳＨ＿ＰＲＯＭＩＳＥ８０６及び８０７を送信する。これに応じて、受信装置１０２はこれを受信する。図８Ａ，８Ｂの例では、ｓｅｇｍｅｎｔＡ２に対してＳｔｒｅａｍ　ＩＤ＝２のｓｔｒｅａｍが予約され、ｓｅｇｍｅｎｔＡ３に対してＳｔｒｅａｍ　ＩＤ＝４のｓｔｒｅａｍが予約されている。なお、ＰＵＳＨ＿ＰＲＯＭＩＳＥ８０６及び８０７はレスポンス８０３の前にやり取りしてもよい。ｓｅｇｍｅｎｔＡ３以降のセグメント（ｓｅｇｍｅｎｔＡ４、ｓｅｇｍｅｎｔＡ５、ｓｅｇｍｅｎｔＡ６）に対応するＰＵＳＨ＿ＰＲＯＭＩＳＥは送信しないものとする。ＨＴＴＰ／２の場合、例えば該当のセグメントの生成が完了していない場合や、同時に送信予約できる上限数に達している場合にＰＵＳＨ＿ＰＲＯＭＩＳＥを送信しない。このような場合以外にも、ＰＵＳＨ＿ＰＲＯＭＩＳＥを送信しないようにしてもよい。 After transmitting the response 803, the transmission apparatus 101 transmits PUSH_PROMISE 806 and 807 for reserving which stream to transmit for segment A2 and segment A3 scheduled for PUSH transmission in HTTP / 2. In response to this, the receiving apparatus 102 receives this. In the example of FIGS. 8A and 8B, the stream with stream ID = 2 is reserved for segmentA2, and the stream with stream ID = 4 is reserved for segmentA3. Note that PUSH_PROMISE 806 and 807 may be exchanged before the response 803. It is assumed that PUSH_PROMISE corresponding to the segment (segment A4, segment A5, segment A6) after segment A3 is not transmitted. In the case of HTTP / 2, for example, when the generation of the corresponding segment is not completed, or when the upper limit number that can be reserved for transmission has been reached at the same time, PUSH_PROMISE is not transmitted. Besides this case, PUSH_PROMISE may not be transmitted.
　Ｓ６０４において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示８０２と識別子８０５を紐づけて保持する。 In S604, the instruction management unit 206 of the transmission apparatus 101 holds the received PUSH transmission instruction 802 and the identifier 805 in association with each other.
　Ｓ７０３において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示８０２の応答８０４とｓｅｇｍｅｎｔＡ１のバイナリデータを含むレスポンス８０３を受信する。さらに、Ｓ７０４において、受信装置１０２の指示管理部３０６は、送信装置１０１により受理されたＰＵＳＨ送信指示８０２を識別子８０５と紐づけて保持する。 In S703, the communication unit 308 of the reception apparatus 102 receives the response 804 including the PUSH transmission instruction 802 response 804 and the segment A1 binary data. In step S <b> 704, the instruction management unit 306 of the reception apparatus 102 holds the PUSH transmission instruction 802 accepted by the transmission apparatus 101 in association with the identifier 805.
　Ｓ６０５において、送信装置１０１は、ＰＵＳＨ送信を開始し、ｓｅｇｍｅｎｔＡ２のＰＵＳＨ送信として、送信装置１０１の通信部２０７はレスポンス８０８を受信装置１０２へ送信する。本実施形態では、セグメントの名称末尾の数値が連続している場合、再生時間的に連続しているものとする。例えば、ｓｅｇｍｅｎｔＡ２とｓｅｇｍｅｎｔＡ３とは再生時間が連続しており、ｓｅｇｍｅｎｔＡ２の末尾の映像がｓｅｇｍｅｎｔＡ３の冒頭の映像に連続する関係にある。 In S605, the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 808 to the reception apparatus 102 as the PUSH transmission of the segment A2. In this embodiment, when the numerical values at the end of the segment names are continuous, it is assumed that they are continuous in terms of playback time. For example, segment A2 and segment A3 have a continuous playback time, and the video at the end of segment A2 is continuous with the video at the beginning of segment A3.
　Ｓ７０５において、受信装置１０２の通信部３０８は、ｓｅｇｍｅｎｔＡ２のバイナリデータを含むレスポンス８０８を受信する。 In S705, the communication unit 308 of the receiving apparatus 102 receives the response 808 including the binary data of segmentA2.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示８１０をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト８０９を送信する。ＰＵＳＨ送信キャンセル指示８１０は、ＰＵＳＨ送信指示８０２によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルする内容を有する。リクエスト８０９のｐａｔｈヘッダーに識別子８０５を指定することでキャンセルしたいＰＵＳＨ送信指示８０２を指定する。識別子８０５は、ｐａｔｈヘッダーに含める代わりに、"ｐｕｓｈ－ＵＲＬ"というプレフィックスと共にａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含めてもよい。このプレフィックスは"ｐｕｓｈ－ＵＲＬ"に限定しない。 In S706, the communication unit 308 of the reception apparatus 102 transmits the request 809 including the PUSH transmission cancel instruction 810 in the accept-push-policy header. The PUSH transmission cancel instruction 810 has a content for canceling all segments scheduled to be PUSH transmitted by the PUSH transmission instruction 802. By specifying the identifier 805 in the path header of the request 809, the PUSH transmission instruction 802 to be canceled is specified. Instead of being included in the path header, the identifier 805 may be included in the accept-push-policy header together with the prefix “push-URL”. This prefix is not limited to “push-URL”.
　Ｓ６０６において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示８１０を含むリクエスト８０９を受信する。 In S606, the communication unit 207 of the transmission apparatus 101 receives the request 809 including the PUSH transmission cancel instruction 810.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は、識別子８０５から判定したキャンセル対象であるＰＵＳＨ送信指示８０２によるＰＵＳＨ送信予定のセグメントで、ｓｅｇｍｅｎｔＡ３をキャンセル候補セグメントと特定する。図８Ａ，８Ｂの例では、ＰＵＳＨ送信指示８０２によりｓｅｇｍｅｎｔＡ２～ｓｅｇｍｅｎｔＡ６のＰＵＳＨ送信が要求されている。ここでは、ｓｅｇｍｅｎｔＡ２は送信済みのため（８０８）、未送信のセグメントのうち最も通し番号が小さいｓｅｇｍｅｎｔＡ３をキャンセル候補として特定している。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A <b> 3 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 to be canceled determined from the identifier 805. In the example of FIGS. 8A and 8B, the PUSH transmission of segment A2 to segment A6 is requested by the PUSH transmission instruction 802. Here, since segment A2 has been transmitted (808), segment A3 having the smallest serial number among untransmitted segments is identified as a cancel candidate.
　送信装置１０１においてＰＵＳＨ送信指示８０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップし、Ｓ６０９へ遷移する。 Since there is no PUSH transmission instruction other than the PUSH transmission instruction 802 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ８０７による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ８１３の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission device 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3. As specific cancel processing, since transmission reservation by PUSH_PROMISE 807 has already been completed, transmission of RST_STREAM 813 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示８１０によるＰＵＳＨ送信指示８０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定し（Ｓ６１０でＮＯ）、Ｓ６０７へ遷移する。 In S610, it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 according to the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は、識別子８０５から判定したキャンセル対象であるＰＵＳＨ送信指示８０２によるＰＵＳＨ送信予定のセグメントで、ｓｅｇｍｅｎｔＡ４をキャンセル候補セグメントと特定する。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A <b> 4 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 to be canceled determined from the identifier 805.
　送信装置１０１においてＰＵＳＨ送信指示８０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップし、Ｓ６０９へ遷移する。 Since there is no PUSH transmission instruction other than the PUSH transmission instruction 802 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ４のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ４のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、送信装置１０１内部でＰＵＳＨ送信を停止する処理のみを行う。ｓｅｇｍｅｎｔＡ４の送信予約は行っていないため、送信装置１０１内部の停止処理のみでよい。 In S609, the instruction management unit 206 of the transmission device 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A4, and the segment determination unit 205 cancels the PUSH transmission of the segment A4. As a specific canceling process, only the process of stopping the PUSH transmission is performed inside the transmitting apparatus 101. Since the segment A4 is not reserved for transmission, only the stop process inside the transmission apparatus 101 is required.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示８１０によるＰＵＳＨ送信指示８０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定し（Ｓ６１０でＮＯ）、Ｓ６０７へ遷移する。 In S610, it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 according to the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
　Ｓ６０７により、送信装置１０１の指示管理部２０６は、識別子８０５から判定したキャンセル対象であるＰＵＳＨ送信指示８０２によるＰＵＳＨ送信予定のセグメントで、ｓｅｇｍｅｎｔＡ５をキャンセル候補セグメントと特定する。 In S607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A5 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 that is the cancellation target determined from the identifier 805.
　送信装置１０１においてＰＵＳＨ送信指示８０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップし、Ｓ６０９へ遷移する。 Since there is no PUSH transmission instruction other than the PUSH transmission instruction 802 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９により、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ５のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ５のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、送信装置１０１内部でＰＵＳＨ送信を停止する処理のみを行う。ｓｅｇｍｅｎｔＡ５の送信予約は行っていないため、送信装置１０１内部の停止処理のみでよい。 In step S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A5, and the segment determination unit 205 cancels the PUSH transmission of the segment A5. As a specific canceling process, only the process of stopping the PUSH transmission is performed inside the transmitting apparatus 101. Since the segment A5 is not reserved for transmission, only the stop process inside the transmission apparatus 101 is required.
　Ｓ６１０により、ＰＵＳＨ送信キャンセル指示８１０によるＰＵＳＨ送信指示８０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定し（Ｓ６１０でＮＯ）、Ｓ６０７へ遷移する。 In S610, it is determined that cancellation is not performed for all cancel candidate segments in the PUSH transmission instruction 802 by the PUSH transmission cancellation instruction 810, and it is determined that cancellation processing is not performed (NO in S610), and the process proceeds to S607.
　Ｓ６０７により、送信装置１０１の指示管理部２０６は、識別子８０５から判定したキャンセル対象であるＰＵＳＨ送信指示８０２によるＰＵＳＨ送信予定のセグメントで、ｓｅｇｍｅｎｔＡ６をキャンセル候補セグメントと特定する。 In S607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A6 as a cancel candidate segment in the PUSH transmission scheduled segment according to the PUSH transmission instruction 802 that is the cancellation target determined from the identifier 805.
　送信装置１０１においてＰＵＳＨ送信指示８０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップしＳ６０９へ遷移する。 Since there is no PUSH transmission instruction other than the PUSH transmission instruction 802 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９により、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ６のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ６のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、送信装置１０１内部でＰＵＳＨ送信を停止する処理のみを行う。ｓｅｇｍｅｎｔＡ６の送信予約は行っていないため、送信装置１０１内部の停止処理のみでよい。 In step S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A6, and the segment determination unit 205 cancels the PUSH transmission of the segment A6. As a specific canceling process, only the process of stopping the PUSH transmission is performed inside the transmitting apparatus 101. Since the transmission reservation of segment A6 is not performed, only the stop process inside the transmission apparatus 101 is sufficient.
　Ｓ６１０により、ＰＵＳＨ送信キャンセル指示８１０によるＰＵＳＨ送信指示８０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all cancel candidate segments in the PUSH transmission instruction 802 by the PUSH transmission cancellation instruction 810 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は８０２のみであるため（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, since the PUSH transmission instruction to be canceled is only 802 (YES in S611), the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示８１０に対する応答８１２をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス８１１を受信装置１０２へ送信する。この応答は、ＰＵＳＨ送信キャンセル指示８１０と同じ内容を有する。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 811 including a response 812 to the PUSH transmission cancel instruction 810 in the push-policy header to the reception apparatus 102. This response has the same content as the PUSH transmission cancel instruction 810.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示の応答８１２を含むレスポンス８１１を受信する。 In S707, the communication unit 308 of the receiving apparatus 102 receives the response 811 including the PUSH transmission cancel instruction response 812.
　キャンセルされたｓｅｇｍｅｎｔＡ３に対して送信装置１０１はすでに受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ８０７を送信している。送信装置１０１はこれをキャンセルするためにＲＳＴ＿ＳＴＲＥＡＭ８１３を送信し受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ８１３はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 The transmitting apparatus 101 has already transmitted PUSH_PROMISE 807 to the receiving apparatus 102 for the canceled segment A3. The transmitting apparatus 101 transmits RST_STREAM 813 to cancel this, and the receiving apparatus 102 receives it. This RST_STREAM 813 may be transmitted by the receiving apparatus 102 before S706 or after S707.
　ＨＴＴＰ２では、複数のｐｕｓｈ－ｐｏｌｉｃｙのうちの一部や、ｐｕｓｈ－ｐｏｌｉｃｙに基づくＰＵＳＨ予定の複数のセグメントの一部をキャンセルするために、全てのＰＵＳＨを一度キャンセルしてから再度必要な設定する必要がある。ＨＴＴＰ２では、ＰＵＳＨ対象のセグメントごとにＰＵＳＨ＿ＰＲＯＭＩＳＥによりストリームのＩＤが通知され、それを指定することで任意のセグメントのＰＵＳＨをキャンセルすることができる。しかし、ＰＵＳＨ＿ＰＲＯＭＩＳＥが遅れて送信される場合や、クライアントがキャンセルすべきセグメント名が分からない場合などに、複数のコマンドをやり取りする必要があるため、トランザクションが増大して遅延が生じる場合があった。 In HTTP2, in order to cancel a part of a plurality of push-policies or a part of a plurality of PUSH-scheduled segments based on the push-policy, it is necessary to cancel all the PUSHs once and then make necessary settings again. There is. In HTTP2, the stream ID is notified by PUSH_PROMISE for each PUSH target segment, and PUSH of an arbitrary segment can be canceled by specifying it. However, when PUSH_PROMISE is transmitted with a delay or when the segment name to be canceled by the client is unknown, it is necessary to exchange a plurality of commands, which may cause a delay due to an increase in transactions.
　これに対して、動作例１では、送信装置１０１が受信装置１０２に、ＰＵＳＨ送信指示のＵＲＬ形式の識別子８０５を通知することで、受信装置１０２は、識別子８０５によりキャンセル対象を特定してキャンセルを指示することができる。したがって、キャンセル対象を特定するために余分なトランザクションを必要とせずに、ＰＵＳＨ送信のキャンセルを行うことが可能である。 On the other hand, in the operation example 1, the transmission apparatus 101 notifies the reception apparatus 102 of the identifier 805 in the URL format of the PUSH transmission instruction, so that the reception apparatus 102 specifies the cancellation target by the identifier 805 and cancels the cancellation. Can be directed. Therefore, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
　（動作例２）
　次に、ＨＴＴＰ／２上で、文字列形式の識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定全てのセグメントをキャンセルする例について、図９Ａ，９Ｂを参照して説明する。 (Operation example 2)
Next, an example in which a PUSH transmission instruction to be canceled is designated by an identifier in a character string format on HTTP / 2, and all segments scheduled to be pushed by the PUSH transmission instruction are canceled will be described with reference to FIGS. 9A and 9B. To do.
　９０１から９０２は８０１から８０２と同じである。また、図６のＳ６０１及び図７のＳ７０１からＳ７０２の処理は、図８Ａ，８Ｂを参照して説明した内容と同様であるため説明は省略する。 901 to 902 are the same as 801 to 802. Also, the processing of S601 in FIG. 6 and S701 to S702 in FIG. 7 is the same as that described with reference to FIGS.
　Ｓ６０２において、送信装置１０１の指示管理部２０６は、受信装置１０２から受信したＰＵＳＨ送信指示９０２に対し"ｐｕｓｈ１"という識別子９０５を割り振る。図９Ａ、９Ｂでは、識別子として文字列の形式を採用している例を示している。 In step S <b> 602, the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 905 “push1” to the PUSH transmission instruction 902 received from the reception apparatus 102. 9A and 9B show an example in which a character string format is adopted as an identifier.
　Ｓ６０３において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示９０２に対する応答として、ＰＵＳＨ送信指示９０２と同内容のＰＵＳＨ送信指示の応答９０４をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス９０３を受信装置１０２へ送信する。レスポンス９０３はまたｓｅｇｍｅｎｔＡ１のバイナリデータを含む。レスポンス９０３のｐｕｓｈ－ｐｏｌｉｃｙヘッダーには、ＰＵＳＨ送信指示の応答８０４と対応させて識別子９０５も含める。なお、識別子９０５の前に"ｐｕｓｈ－ＩＤ"というプレフィックスを入れることで、ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのどこからが識別子９０５なのかを区別できるようにしている。このプレフィックスは"ｐｕｓｈ－ＩＤ"に限定しない。識別子９０５をＰＵＳＨ送信指示の応答９０４と共に送信する代わりに、受信装置１０２からＭＰＤの取得要求を受けた際に送信装置１０１はＭＰＤに識別子９０５を記載し受信装置１０２へ通知してもよい。 In step S <b> 603, the communication unit 207 of the transmission apparatus 101 transmits, as a response to the push transmission instruction 902, a response 903 including a push transmission policy response 904 having the same content as the push transmission instruction 902 to the reception apparatus 102. . The response 903 also includes the binary data of segmentA1. The push-policy header of the response 903 includes an identifier 905 in association with the PUSH transmission instruction response 804. Note that a prefix “push-ID” is inserted before the identifier 905 so that the identifier 905 can be identified from where in the push-policy header. This prefix is not limited to “push-ID”. Instead of transmitting the identifier 905 together with the PUSH transmission instruction response 904, when receiving an MPD acquisition request from the receiving apparatus 102, the transmitting apparatus 101 may describe the identifier 905 in the MPD and notify the receiving apparatus 102.
　９０６から９０８は８０６から８０８と同様である。また図６のＳ６０４からＳ６０５及び図７のＳ７０３からＳ７０５における処理は、図８Ａ，８Ｂを参照して説明したＰＵＳＨ送信の処理と内容が同様であるため説明は省略する。 906 to 908 are the same as 806 to 808. The processing in S604 to S605 in FIG. 6 and the processing in S703 to S705 in FIG. 7 is the same as the PUSH transmission processing described with reference to FIGS.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示９１１をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト９０９を送信装置１０１へ送信する。ＰＵＳＨ送信キャンセル指示９１１は、ＰＵＳＨ送信指示９０２によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルする内容である。リクエスト９０９のａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに識別子９０５（"ｐｕｓｈ１"）を合わせて含めることでキャンセルしたいＰＵＳＨ送信指示９０２を指定することができる。リクエスト９０９のｐａｔｈに指定するＵＲＬ９１０は、ＭＰＤに記載するなどして事前に送信装置１０１－受信装置１０２間で共有したものを指定する。９１２から９１４は８１１から８１３と同様である。また、図６のＳ６０６からＳ６１２及び図７のＳ７０７の処理は、図８Ａ，８Ｂを参照して説明した内容と同様であるため説明は省略する。 In S706, the communication unit 308 of the reception apparatus 102 transmits a request 909 including the PUSH transmission cancel instruction 911 in the accept-push-policy header to the transmission apparatus 101. The PUSH transmission cancel instruction 911 is a content for canceling all the segments scheduled to be PUSH transmitted by the PUSH transmission instruction 902. By including the identifier 905 ("push1") in the request-push-policy header of the request 909, the PUSH transmission instruction 902 to be canceled can be designated. The URL 910 specified in the path of the request 909 specifies what is shared between the transmitting apparatus 101 and the receiving apparatus 102 in advance by describing it in the MPD. 912 to 914 are the same as 811 to 813. Also, the processing from S606 to S612 in FIG. 6 and S707 in FIG. 7 is the same as the content described with reference to FIGS.
　動作例２では、送信装置１０１が受信装置１０２に、ＰＵＳＨ送信指示の文字列形式の識別子９０５を通知することで、受信装置１０２は、識別子９０５によりキャンセル対象を特定してキャンセルを指示することができる。したがって、キャンセル対象を特定するために余分なトランザクションを必要とせずに、ＰＵＳＨ送信のキャンセルを行うことが可能である。 In the operation example 2, the transmission apparatus 101 notifies the reception apparatus 102 of the identifier 905 in the character string format of the PUSH transmission instruction, so that the reception apparatus 102 can specify the cancellation target by the identifier 905 and instruct the cancellation. it can. Therefore, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
　（動作例３）
　次に、ＨＴＴＰ／２上で、ＰＵＳＨ送信指示の内容とＰＵＳＨ送信指示を送信した際に合わせて取得したリソースの組み合わせによりキャンセルすべきＰＵＳＨ送信指示を指定する例について、図１０Ａ，１０Ｂを参照して説明する。図１０Ａ，１０Ｂは、ＰＵＳＨ送信指示によりＰＵＳＨする予定の全てのセグメントをキャンセルする例を示している。 (Operation example 3)
Next, referring to FIGS. 10A and 10B, an example of specifying a PUSH transmission instruction to be canceled by a combination of resources acquired when transmitting the contents of the PUSH transmission instruction and the PUSH transmission instruction on HTTP / 2 will be described. I will explain. 10A and 10B show an example in which all segments scheduled to be pushed by a PUSH transmission instruction are canceled.
　図１０Ａ，１０Ｂの１００１及び１００３は、図８Ａ，８Ｂの８０１及び８０２と同様である。また、図６のＳ６０１及び図７のＳ７０１からＳ７０２における処理は、図８Ａ，８Ｂを参照して説明した処理の内容と同様あるため説明は省略する。 10A and 10B are the same as 801 and 802 in FIGS. 8A and 8B. Also, the processing in S601 of FIG. 6 and S701 to S702 of FIG. 7 is the same as the processing described with reference to FIGS.
　図１０Ａ，１０Ｂの例では、ＰＵＳＨ送信指示の内容とＰＵＳＨ送信指示を送信した際に取得したリソースの組み合わせによりＰＵＳＨ送信キャンセル指示を行う。このため、送信装置１０１がＰＵＳＨ送信指示に識別子を割り振るＳ６０２はスキップする。図１０Ａ，１０Ｂの場合、リソースとは、リクエスト１００１でＧＥＴ対象となっている"ｓｅｇｍｅｎｔＡ１"（リソース１００２）である。 In the example of FIGS. 10A and 10B, a PUSH transmission cancel instruction is performed by combining the contents of the PUSH transmission instruction and the resources acquired when the PUSH transmission instruction is transmitted. For this reason, S602 in which the transmission apparatus 101 allocates an identifier to the PUSH transmission instruction is skipped. 10A and 10B, the resource is “segment A1” (resource 1002) that is a GET target in the request 1001.
　Ｓ６０３において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示１００３に対する応答を含むレスポンス１００４を受信装置１０２へ返す。図１０Ａ，１０Ｂの例では、レスポンス１００４は、ＰＵＳＨ送信指示１００３と同じ内容であるＰＵＳＨ送信指示の応答１００５をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含んでいる。また、レスポンス１００４は、ｓｅｇｍｅｎｔＡ１のバイナリデータを含んでいる。レスポンス１００４は、図８Ａ，８Ｂ、図９Ａ，９Ｂを参照して説明した動作例とは異なり、ＰＵＳＨ送信指示の識別子は含まない。 In step S <b> 603, the communication unit 207 of the transmission apparatus 101 returns a response 1004 including a response to the PUSH transmission instruction 1003 to the reception apparatus 102. In the example of FIGS. 10A and 10B, the response 1004 includes a PUSH transmission instruction response 1005 having the same content as the PUSH transmission instruction 1003 in the push-policy header. Further, the response 1004 includes the binary data of segmentA1. Unlike the operation example described with reference to FIGS. 8A and 8B and FIGS. 9A and 9B, the response 1004 does not include the identifier of the PUSH transmission instruction.
　１００６から１００８は、図８Ａ，８Ｂの８０６から８０８と同様である。また、図６のＳ６０４からＳ６０５及び図７のＳ７０３からＳ７０５の処理は、図８Ａ，８Ｂを参照して説明したＰＵＳＨ送信の処理と内容が同様であるため説明は省略する。 1006 to 1008 are the same as 806 to 808 in FIGS. 8A and 8B. Further, the processing from S604 to S605 in FIG. 6 and the processing from S703 to S705 in FIG. 7 are the same as the PUSH transmission processing described with reference to FIGS.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１０１０をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１００９を送信装置１０１へ送信する。ＰＵＳＨ送信キャンセル指示１０１０の内容は、ＰＵＳＨ送信指示１００３によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルするというものである。リクエスト１００１でＧＥＴ対象となっていたｓｅｇｍｅｎｔＡ１（リソース１００２）をｐａｔｈヘッダーに含み、さらにＰＵＳＨ送信指示１００３の内容をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含める。これによりキャンセルしたいＰＵＳＨ送信指示１００３を指定する。プッシュ送信指示内容とリソースを組み合わせることで、同じＰＵＳＨ送信指示内容が複数のリソースに対して使われていても、キャンセル対象を指定することができる。 In S706, the communication unit 308 of the reception apparatus 102 transmits a request 1009 including the PUSH transmission cancel instruction 1010 in the accept-push-policy header to the transmission apparatus 101. The content of the PUSH transmission cancel instruction 1010 is to cancel all the segments scheduled to be PUSH transmitted by the PUSH transmission instruction 1003. The segment A1 (resource 1002) that has been a GET target in the request 1001 is included in the path header, and the contents of the PUSH transmission instruction 1003 are included in the accept-push-policy header. As a result, a PUSH transmission instruction 1003 to be canceled is designated. By combining the push transmission instruction content and the resource, the cancellation target can be specified even if the same PUSH transmission instruction content is used for a plurality of resources.
　１０１１から１０１３は図８Ａ，８Ｂの８１１から８１３と同様である。また図６のＳ６０６からＳ６１２及び図７のＳ７０７の処理は、図８Ａ，８Ｂを参照して説明した処理の内容と同様であるため説明は省略する。 1011 to 1013 are the same as 811 to 813 in FIGS. 8A and 8B. Also, the processing from S606 to S612 in FIG. 6 and the processing in S707 in FIG. 7 are the same as the processing described with reference to FIGS.
　動作例３では、受信装置１０２は、ＰＵＳＨ送信指示の内容とＰＵＳＨ送信指示を送信した際に合わせて取得したリソースの組み合わせによりキャンセルすべきＰＵＳＨ送信指示を指定する。ＰＵＳＨ送信指示１００３とリソース１００２によりキャンセル対象を特定してキャンセルを指示することができる。したがって、受信装置１０２は、余分なトランザクションを必要とせずに、キャンセル対象を直接特定してＰＵＳＨ送信のキャンセルを行うことが可能である。 In Operation Example 3, the receiving apparatus 102 designates a PUSH transmission instruction to be canceled based on a combination of resources acquired when the content of the PUSH transmission instruction and the PUSH transmission instruction are transmitted. The cancellation can be instructed by specifying the cancel target by the PUSH transmission instruction 1003 and the resource 1002. Therefore, the receiving apparatus 102 can directly cancel the PUSH transmission by directly specifying the cancellation target without requiring an extra transaction.
　（動作例４）
　次に、ＨＴＴＰ／２上で、複数のＰＵＳＨ送信指示を要求した後で、ＵＲＬ形式の識別子によりキャンセルするＰＵＳＨ送信指示を一つ指定し、ＰＵＳＨ送信指示によりＰＵＳＨ予定の全てのセグメントをキャンセルする例について、図１１Ａ，１１Ｂ，１１Ｃを参照して説明する。この例では、識別子は送信装置１０１が割り振るとして、受信装置１０２がＰＵＳＨ送信指示に識別子を割り振るＳ７０１はスキップする。 (Operation example 4)
Next, after requesting a plurality of PUSH transmission instructions on HTTP / 2, one PUSH transmission instruction to be canceled is specified by an identifier in the URL format, and all segments scheduled for PUSH are canceled by the PUSH transmission instruction Will be described with reference to FIGS. 11A, 11B, and 11C. In this example, assuming that the identifier is allocated by the transmission apparatus 101, S701 in which the reception apparatus 102 allocates an identifier to the PUSH transmission instruction is skipped.
　Ｓ７０２において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示１１０２と１１０３をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１１０１を送信装置１０１へ送信する。リクエスト１１０１は二つのａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーを持ち、これら二つのヘッダーによりＰＵＳＨ送信指示１１０２と１１０３を含む。別々のａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーではなく、一つのａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに、ＰＵＳＨ送信指示１１０２と１１０３を含めてもよい。ＰＵＳＨ送信指示１１０２において、図８Ａ，８Ｂの８０２と同様に、"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｎｅｘｔ"に続く数字"２"は、"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"に続いて取得するセグメントの個数を指定している。したがって、受信装置１０２は、ＰＵＳＨ送信指示１１０２によってｓｅｇｍｅｎｔＡ２及びｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信を要求している。また、ＰＵＳＨ送信指示１１０３において、"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＢ（％０１ｄ）"に続く括弧内の二つの数字は、"（％０１ｄ）"が採りうる値の範囲により、要求対象のセグメントを特定している。１１０３の例では、"｛２，３｝"が範囲として指定されているから、ＰＵＳＨ送信指示１１０３によって、ｓｅｇｍｅｎｔＢ２及びｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信要求が行われている。 In S <b> 702, the communication unit 308 of the reception apparatus 102 transmits a request 1101 including PUSH transmission instructions 1102 and 1103 in an accept-push-policy header to the transmission apparatus 101. The request 1101 has two accept-push-policy headers, and PUSH transmission instructions 1102 and 1103 are included by these two headers. The PUSH transmission instructions 1102 and 1103 may be included in a single accept-push-policy header instead of a separate accept-push-policy header. In the PUSH transmission instruction 1102, similarly to 802 in FIGS. 8A and 8B, the number “2” following “urn: sample: push-next” indicates the number of segments to be acquired following “/ example / tmp / segmentA1”. It is specified. Accordingly, the receiving apparatus 102 requests the PUSH transmission of the segment A2 and the segment A3 by the PUSH transmission instruction 1102. Also, in the PUSH transmission instruction 1103, the two numbers in parentheses following “/ example / tmp / segmentB (% 01d)” specify the requested segment by the range of values that “(% 01d)” can take. is doing. In the example of 1103, since “{2, 3}” is specified as a range, a PUSH transmission request for segment B2 and segment B3 is made in accordance with the PUSH transmission instruction 1103.
　Ｓ６０１において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示１１０２と１１０３を含むリクエスト１１０１を受信する。 In S601, the communication unit 207 of the transmission apparatus 101 receives the request 1101 including the PUSH transmission instructions 1102 and 1103.
　Ｓ６０２において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示１１０２に"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ１"という識別子１１０６を割り振る。さらに、ＰＵＳＨ送信指示１１０３に対し、"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ２"という識別子１１０８をそれぞれ割り振る。この例では、識別子はＵＲＬの形式を採用している。 In S602, the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1106 of “/ example / tmp / push1” to the received PUSH transmission instruction 1102. Furthermore, an identifier 1108 of “/ example / tmp / push2” is allocated to the PUSH transmission instruction 1103. In this example, the identifier adopts the URL format.
　Ｓ６０３において、送信装置１０１の通信部２０７はＰＵＳＨ送信指示１１０２と１１０３に対する応答をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１１０４を受信装置１０２へ送信する。レスポンス１１０４はまたｓｅｇｍｅｎｔＡ１のバイナリデータを含んでいる。図１１Ａ，１１Ｂ，１１Ｃの例では、ＰＵＳＨ送信指示１１０２と１１０３に対する応答として、ＰＵＳＨ送信指示１１０２及び１１０３と同じ内容であるＰＵＳＨ送信指示の応答１１０５と１１０７を含んでいる。すなわち、レスポンス１１０４は二つのｐｕｓｈ－ｐｏｌｉｃｙヘッダーを持ち、これら二つのヘッダーによりＰＵＳＨ送信指示の応答１１０５と１１０７を含んでいる。なお、別々のｐｕｓｈ－ｐｏｌｉｃｙヘッダーではなく、一つのｐｕｓｈ－ｐｏｌｉｃｙヘッダーにＰＵＳＨ送信指示の応答１１０５と１１０７を含めてもよい。図１１Ａ，１１Ｂ，１１Ｃの例では、さらに、応答１１０５に対応させて識別子１１０６（"ｐｕｓｈ１"）を、応答１１０７に対応させて識別子１１０８（"ｐｕｓｈ２"）を含めている。識別子１１０６、１１０８の前に"ｐｕｓｈ－ＵＲＬ"というプレフィックスを入れることで、ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのどこからが識別子１１０６、１１０８なのかを区別できるようにしている。このプレフィックスは"ｐｕｓｈ－ＵＲＬ"に限定しない。 In S603, the communication unit 207 of the transmission apparatus 101 transmits a response 1104 including responses to the PUSH transmission instructions 1102 and 1103 in the push-policy header to the reception apparatus 102. The response 1104 also includes the binary data of segmentA1. In the example of FIGS. 11A, 11B, and 11C, responses to the PUSH transmission instructions 1102 and 1103 include PUSH transmission instruction responses 1105 and 1107 having the same contents as the PUSH transmission instructions 1102 and 1103. That is, the response 1104 has two push-policy headers, and includes PUSH transmission instruction responses 1105 and 1107 by these two headers. It should be noted that the PUSH transmission instruction responses 1105 and 1107 may be included in one push-policy header instead of separate push-policy headers. 11A, 11B, and 11C further include an identifier 1106 (“push1”) corresponding to the response 1105 and an identifier 1108 (“push2”) corresponding to the response 1107. By inserting a prefix “push-URL” before the identifiers 1106 and 1108, it is possible to distinguish where the identifiers 1106 and 1108 are from in the push-policy header. This prefix is not limited to “push-URL”.
　レスポンス１１０４送信後、送信装置１０１は、ＨＴＴＰ／２における、ＰＵＳＨ送信予定のセグメント毎に、そのセグメントを送信するためのｓｔｒｅａｍを予約するＰＵＳＨ＿ＰＲＯＭＩＳＥ１１０９～１１１２を受信装置１０２へ送信する。受信装置１０２は、ＰＵＳＨ＿ＰＲＯＭＩＳＥ１１０９～１１１２を送信装置１０１から受信する。ＰＵＳＨ＿ＰＲＯＭＩＳＥ１１０９、１１１０、１１１１及び１１１２は、レスポンス１１０４の前に送受信してもよい。 After transmitting the response 1104, the transmission apparatus 101 transmits PUSH_PROMISE 1109 to 1112 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102. The receiving apparatus 102 receives PUSH_PROMISE 1109 to 1112 from the transmitting apparatus 101. PUSH_PROMISE 1109, 1110, 1111, and 1112 may be transmitted / received before the response 1104.
　Ｓ６０４において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示１１０２と識別子１１０６、及び、ＰＵＳＨ送信指示１１０３と識別子１１０８を紐づけて保持する。 In S604, the instruction management unit 206 of the transmission apparatus 101 associates and holds the received PUSH transmission instruction 1102 and the identifier 1106, and the PUSH transmission instruction 1103 and the identifier 1108.
　Ｓ７０３において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示１１０２に対する応答１１０５、及び、ＰＵＳＨ送信指示１１０３に対する応答１１０７を含むレスポンス１１０４を受信する。 In S703, the communication unit 308 of the reception apparatus 102 receives a response 1104 including a response 1105 to the PUSH transmission instruction 1102 and a response 1107 to the PUSH transmission instruction 1103.
　Ｓ７０４において、受信装置１０２の指示管理部３０６は、応答が返ってきて受理されたＰＵＳＨ送信指示１１０２及び１１０３を、識別子１１０６及び１１０８と紐づけて保持する。 In S704, the instruction management unit 306 of the receiving apparatus 102 holds the PUSH transmission instructions 1102 and 1103 received after the response is returned in association with the identifiers 1106 and 1108.
　Ｓ６０５において、送信装置１０１はＰＵＳＨ送信を開始し、ｓｅｇｍｅｎｔＡ２のＰＵＳＨ送信として、送信装置１０１の通信部２０７は、ｓｅｇｍｅｎｔＡ２のバイナリデータを含むレスポンス１１１３を受信装置１０２へ送信する。 In S605, the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1113 including the binary data of the segment A2 to the reception apparatus 102 as the PUSH transmission of the segment A2.
　Ｓ７０５において、受信装置１０２の通信部３０８はレスポンス１１１３を受信する。 In step S <b> 705, the communication unit 308 of the reception apparatus 102 receives the response 1113.
　Ｓ７０６において、受信装置１０２の通信部３０８はＰＵＳＨ送信キャンセル指示１１１５をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１１１４を送信する。本例では、ＰＵＳＨ送信キャンセル指示１１１５は、識別子１１０８により識別されるＰＵＳＨ送信指示１１０３によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルするという内容である。リクエスト１１１４のｐａｔｈヘッダーにキャンセルしたいＰＵＳＨ送信指示１１０３に対応する識別子１１０８を指定する。 In S706, the communication unit 308 of the reception apparatus 102 transmits the request 1114 including the PUSH transmission cancel instruction 1115 in the accept-push-policy header. In this example, the PUSH transmission cancel instruction 1115 has a content of canceling all segments scheduled to be PUSH transmitted by the PUSH transmission instruction 1103 identified by the identifier 1108. An identifier 1108 corresponding to the PUSH transmission instruction 1103 to be canceled is specified in the path header of the request 1114.
　Ｓ６０６において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１１１５を含むリクエスト１１１４を受信装置１０２から受信する。 In step S <b> 606, the communication unit 207 of the transmission apparatus 101 receives the request 1114 including the PUSH transmission cancel instruction 1115 from the reception apparatus 102.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１１０８から判定したキャンセル対象であるＰＵＳＨ送信指示１１０３によるＰＵＳＨ予定のセグメントで、その中の一つのセグメントをキャンセル候補セグメント特定する。この例では、ＰＵＳＨ送信指示１１０３によるＰＵＳＨ予定のセグメントはｓｅｇｍｅｎｔＢ２、ｓｅｇｍｅｎｔＢ３であるから、その中の一つであるｓｅｇｍｅｎｔＢ２をキャンセル候補セグメントと特定する。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 specifies a cancel candidate segment for one of the segments scheduled to be pushed by the PUSH transmission instruction 1103 to be canceled determined from the identifier 1108. In this example, since the PUSH scheduled segments according to the PUSH transmission instruction 1103 are segment B2 and segment B3, one of them, segment B2, is specified as a cancel candidate segment.
　Ｓ６０８において、キャンセル候補セグメントであるｓｅｇｍｅｎｔＢ２は、ＰＵＳＨ送信指示１１０３以外で送信装置１０１が採用しているＰＵＳＨ送信指示１１０２によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, segment B2, which is a cancel candidate segment, determines that it is not a PUSH transmission target other than the PUSH transmission instruction 1103 according to the PUSH transmission instruction 1102 adopted by the transmission apparatus 101 (NO in S608), and proceeds to S609. .
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＢ２のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＢ２のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１１１１による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１１１８の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B2, and the segment determination unit 205 cancels the PUSH transmission of the segment B2. As specific cancellation processing, since transmission reservation by PUSH_PROMISE 1111 has already been completed, transmission of RST_STREAM 1118 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１１１５によるＰＵＳＨ送信指示１１０３のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定する（Ｓ６１０でＮＯ）。ＰＵＳＨ予定のセグメントの中で、ｓｅｇｍｅｎｔＢ３について処理を行っていないためである。そこで、Ｓ６０７へ遷移する。 In S610, it is determined that the cancellation is not performed for all the cancel candidate segments of the PUSH transmission instruction 1103 according to the PUSH transmission cancellation instruction 1115 and the cancel process is not performed (NO in S610). This is because the segment B3 is not processed in the PUSH scheduled segment. Therefore, the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１１０８から判定したキャンセル対象であるＰＵＳＨ送信指示１１０３がＰＵＳＨ予定のセグメントで、その中の一つであるｓｅｇｍｅｎｔＢ３をキャンセル候補セグメントと特定する。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies the PUSH transmission instruction 1103 to be canceled determined from the identifier 1108 as a PUSH scheduled segment, and identifies segment B <b> 3, which is one of them, as a cancel candidate segment.
　Ｓ６０８において、キャンセル候補セグメントであるｓｅｇｍｅｎｔＢ３が、ＰＵＳＨ送信指示１１０３以外で送信装置１０１が採用しているＰＵＳＨ送信指示１１０２によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, it is determined that segment B3, which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1102 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1103 (NO in S608), and the process proceeds to S609. .
　Ｓ６０９において、送信装置１０１の指示管理部２０６はセグメント決定部２０５へｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１１１２による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１１１９の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B3, and the segment determination unit 205 cancels the PUSH transmission of the segment B3. As specific cancellation processing, since transmission reservation by PUSH_PROMISE 1112 has already been completed, transmission of RST_STREAM 1119 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１１１５によるＰＵＳＨ送信指示１１０３のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all the cancel candidate segments of the PUSH transmission instruction 1103 according to the PUSH transmission cancellation instruction 1115 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は１１０３のみであるため（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, since the PUSH transmission instruction to be canceled is only 1103 (YES in S611), the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１１１５に対する応答１１１７をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１１１６を受信装置１０２へ送信する。この応答１１１７は、ＰＵＳＨ送信キャンセル指示１１１５と同じ内容を有する。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1116 including a response 1117 to the PUSH transmission cancel instruction 1115 in the push-policy header to the reception apparatus 102. This response 1117 has the same content as the PUSH transmission cancel instruction 1115.
　Ｓ７０７において、受信装置１０２の通信部３０８はＰＵＳＨ送信キャンセル指示の応答１１１７を含むレスポンス１１１６を受信する。 In S707, the communication unit 308 of the reception apparatus 102 receives the response 1116 including the response 1117 of the PUSH transmission cancel instruction.
　キャンセルされたｓｅｇｍｅｎｔＢ２及びｓｅｇｍｅｎｔＢ３に対して、送信装置１０１は受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ１１１１及び１１１２を送信しているため、これらをキャンセルする必要がある。そこで、送信装置１０１は受信装置１０２へＲＳＴ＿ＳＴＲＥＡＭ１１１８及び１１１９を送信し、受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１１１８及び１１１９はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 Since the transmitting apparatus 101 transmits PUSH_PROMISE 1111 and 1112 to the receiving apparatus 102 for the canceled segment B2 and segment B3, it is necessary to cancel them. Therefore, the transmission apparatus 101 transmits RST_STREAM 1118 and 1119 to the reception apparatus 102, and the reception apparatus 102 receives them. The reception apparatus 102 may transmit these RST_STREAMs 1118 and 1119 before S706 or after S707.
　動作例４では、２つのＰＵＳＨ送信指示１１０２、１１０３が送信され、一方のＰＵＳＨ送信指示について、全てのセグメントのキャンセルが指示された場合の例を説明した。動作例４では、各ＰＵＳＨ送信指示に識別子１１０６、１１０８を付与して、ＰＵＳＨ送信指示を指定可能としたことで、キャンセル対象を特定するために余分なトランザクションを必要とせずに、ＰＵＳＨ送信のキャンセルを行うことができる。 In the operation example 4, the example in which two PUSH transmission instructions 1102 and 1103 are transmitted and cancellation of all segments is instructed for one PUSH transmission instruction has been described. In the operation example 4, the identifiers 1106 and 1108 are assigned to the respective PUSH transmission instructions so that the PUSH transmission instruction can be designated, so that it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target. It can be performed.
　（動作例５）
　次に、ＨＴＴＰ／２上で、ＵＲＬ形式の識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定のセグメントのうち一部のセグメントをキャンセルする例について、図１２Ａ，１２Ｂ，１２Ｃを参照して説明する。 (Operation example 5)
Next, an example of designating a PUSH transmission instruction to be canceled by an identifier in the URL format on HTTP / 2 and canceling some of the segments scheduled to be pushed by the PUSH transmission instruction will be described with reference to FIGS. This will be described with reference to 12C.
　１２０１から１２０７及び１２１０は、８０１から８０８と同様である。また図６のＳ６０１からＳ６０５及び図７のＳ７０１からＳ７０５の処理は、図８Ａ，８Ｂを参照して説明した処理の内容同様であるため説明は省略する。ただし、図１２Ａ，１２Ｂ，１２Ｃの例では、ＰＵＳＨ送信指示１２０２はｓｅｇｍｅｎｔＡ１から再生時間的に連続する次の四つのセグメントのＰＵＳＨ送信要求をするものとなっている。また、ＰＵＳＨ＿ＰＲＯＭＩＳＥ１２０６と１２０７と共に、ｓｅｇｍｅｎｔＡ４及びｓｅｇｍｅｎｔＡ５の送信を予約するＰＵＳＨ＿ＰＲＯＭＩＳＥ１２０８及び１２０９を送信している。 1201 to 1207 and 1210 are the same as 801 to 808. Also, the processing from S601 to S605 in FIG. 6 and the processing from S701 to S705 in FIG. However, in the examples of FIGS. 12A, 12B, and 12C, the PUSH transmission instruction 1202 makes a PUSH transmission request for the next four segments continuous from the segment A1 in terms of reproduction time. In addition to PUSH_PROMISE 1206 and 1207, PUSH_PROMISE 1208 and 1209 that reserve transmission of segment A4 and segment A5 are transmitted.
　Ｓ７０６において、受信装置１０２は、ＰＵＳＨ送信指示１２１２をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１２１１として送信装置１０１へ送信する。ＰＵＳＨ送信指示１２１２は、ｓｅｇｍｅｎｔＡ１から再生時間的に連続する次の四つのセグメントのＰＵＳＨ送信を指示しているＰＵＳＨ送信指示１２０２に対し、送信予定セグメントのうち後ろから二つのセグメントをキャンセルする指示となる。この点についてより詳しく説明すると、ＰＵＳＨ送信指示１２１２は、識別子"ｐｕｓｈ１"（１２０５）により識別される、ｓｅｇｍｅｎｔＡ１に後続する連続する二つのセグメントｓｅｇｍｅｎｔＡ２、ｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信を要求するものである。リクエスト１２０１では、ｓｅｇｍｅｎｔＡ１に後続する連続する四つのセグメントのＰＵＳＨ送信を要求していた（ＰＵＳＨ送信指示１２０２）のであるから、ＰＵＳＨ送信指示１２１２は、ｓｅｇｍｅｎｔＡ４、ｓｅｇｍｅｎｔＡ５の送信要求をキャンセルする要求に相当する。このように、図１２Ａ，１２Ｂ，１２Ｃの例では、同一の識別子により識別されるＰＵＳＨ送信要求について、内容の異なるＰＵＳＨ送信要求が送受信されたときは、最後に送受信された要求に従い動作する。リクエスト１２１１のｐａｔｈヘッダーに識別子１２０５を指定することでキャンセルしたいＰＵＳＨ送信指示１２０２を指定する。 In S706, the reception apparatus 102 transmits the PUSH transmission instruction 1212 to the transmission apparatus 101 as a request 1211 including the accept-push-policy header. The PUSH transmission instruction 1212 is an instruction to cancel two segments from the back among the scheduled transmission segments in response to the PUSH transmission instruction 1202 instructing the PUSH transmission of the next four segments continuous from the segment A1 in terms of the reproduction time. . This point will be described in more detail. The PUSH transmission instruction 1212 is a request for PUSH transmission of two consecutive segments segmentA2 and segmentA3, which are identified by the identifier “push1” (1205) and follow segmentA1. Since the request 1201 requests the PUSH transmission of four consecutive segments following the segment A1 (PUSH transmission instruction 1202), the PUSH transmission instruction 1212 corresponds to a request for canceling the transmission requests of the segment A4 and the segment A5. . As described above, in the example of FIGS. 12A, 12B, and 12C, when a PUSH transmission request having a different content is transmitted / received with respect to a PUSH transmission request identified by the same identifier, the operation is performed according to the request transmitted / received last. By specifying the identifier 1205 in the path header of the request 1211, the PUSH transmission instruction 1202 to be canceled is specified.
　Ｓ６０６において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１２１２を含むリクエスト１２１１を受信装置１０２から受信する。 In S606, the communication unit 207 of the transmission apparatus 101 receives the request 1211 including the PUSH transmission cancel instruction 1212 from the reception apparatus 102.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１２０５から判定したキャンセル対象であるＰＵＳＨ送信指示１２０２によるＰＵＳＨ予定のセグメントで、その中の一つであるｓｅｇｍｅｎｔＡ４をキャンセル候補セグメントと特定する。送信装置１０１においてＰＵＳＨ送信指示１２０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップしＳ６０９へ遷移する。 In S607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A4, which is one of the PUSH scheduled segments based on the PUSH transmission instruction 1202 to be canceled determined from the identifier 1205, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1202 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ４のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５は、ｓｅｇｍｅｎｔＡ４のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１２０８による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１２１５の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A4, and the segment determination unit 205 cancels the PUSH transmission of the segment A4. As specific cancellation processing, since transmission reservation by PUSH_PROMISE 1208 has already been completed, transmission of RST_STREAM 1215 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１２１２によるＰＵＳＨ送信指示１２０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定する（Ｓ６１０でＮＯ）。ｓｅｇｍｅｎｔＡ５について処理を行っていないためである。そこで、Ｓ６０７へ遷移する。 In S610, it is determined that the cancellation is not performed for all the cancel candidate segments of the PUSH transmission instruction 1202 by the PUSH transmission cancellation instruction 1212 and the cancel process is not performed (NO in S610). This is because segment A5 is not processed. Therefore, the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１２０５から判定したキャンセル対象であるＰＵＳＨ送信指示１２０２がＰＵＳＨ予定のセグメントで、その中の一つであるｓｅｇｍｅｎｔＡ５をキャンセル候補セグメントと特定する。送信装置１０１においてＰＵＳＨ送信指示１２０２以外で指示されているＰＵＳＨ送信指示はないためＳ６０８をスキップしＳ６０９へ遷移する。 In S607, the instruction management unit 206 of the transmission apparatus 101 identifies the PUSH transmission instruction 1202 to be canceled determined from the identifier 1205 as a PUSH scheduled segment, and identifies segment A5, which is one of them, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1202 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＡ５のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５は、ｓｅｇｍｅｎｔＡ５のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１２０９による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１２１６の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A5, and the segment determination unit 205 cancels the PUSH transmission of the segment A5. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1209 has already been completed, transmission of RST_STREAM 1216 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１２１２によるＰＵＳＨ送信指示１２０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all cancel candidate segments in the PUSH transmission instruction 1202 by the PUSH transmission cancellation instruction 1212 and cancellation processing has been performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は１２０２のみであるため（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, since the PUSH transmission instruction to be canceled is only 1202 (YES in S611), the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１２１２に対する応答１２１４をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１２１３を受信装置１０２へ送信する。この応答１２１４は、ＰＵＳＨ送信キャンセル指示１２１２と同様の内容を有する。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1213 including a response 1214 to the PUSH transmission cancel instruction 1212 in the push-policy header to the reception apparatus 102. This response 1214 has the same content as the PUSH transmission cancel instruction 1212.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示の応答１２１４を含むレスポンス１２１３を受信する。 In S707, the communication unit 308 of the reception apparatus 102 receives a response 1213 including a PUSH transmission cancel instruction response 1214.
　キャンセルされたｓｅｇｍｅｎｔＡ４及びｓｅｇｍｅｎｔＡ５に対して送信装置１０１は受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ１２０８及び１２０９を送信している。そのため、これらをキャンセルするためにＲＳＴ＿ＳＴＲＥＡＭ１２１５及び１２１６を送信し受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１２１５及び１２１６はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 The transmitting apparatus 101 transmits PUSH_PROMISE 1208 and 1209 to the receiving apparatus 102 with respect to the canceled segment A4 and segment A5. Therefore, in order to cancel these, RST_STREAM 1215 and 1216 are transmitted, and the receiving apparatus 102 receives them. The reception apparatus 102 may transmit these RST_STREAMs 1215 and 1216 before S706 or after S707.
　動作例５では、ＰＵＳＨ送信指示に識別子１２０５を付与することで、受信装置１０２は、余分なトランザクションを要さずに、識別子１２０５を指定して送信対象のセグメントの一部の送信をキャンセルすることが可能な例を説明した。 In the operation example 5, by giving the identifier 1205 to the PUSH transmission instruction, the receiving apparatus 102 can specify the identifier 1205 and cancel transmission of a part of the transmission target segment without requiring an extra transaction. Explained possible examples.
　（動作例６）
　次に、ＨＴＴＰ／２上で、複数のＰＵＳＨ送信指示を要求し採用された後で、ＵＲＬ形式の識別子によりキャンセル対象として全てのＰＵＳＨ送信指示を指定する場合の例について、図１３Ａ，１３Ｂ，１３Ｃを参照して説明する。図１３Ａ，１３Ｂ，１３Ｃでは、各ＰＵＳＨ送信指示がＰＵＳＨ送信する予定全てのセグメントをキャンセルする例を示している。図１３Ａ，１３Ｂ，１３Ｃの１３０１から１３１３は図１１Ａ，１１Ｂ，１１Ｃの１１０１から１１１３と同様である。また図６のＳ６０１から６０５及び図７のＳ７０１から７０５の処理は、図１１Ａ，１１Ｂ，１１Ｃ、図８Ａ，８Ｂを参照して説明した処理の内容と同様であるため説明は省略する。 (Operation example 6)
Next, with respect to an example in which all PUSH transmission instructions are designated as cancellation targets by identifiers in the URL format after a plurality of PUSH transmission instructions are requested and adopted on HTTP / 2, FIGS. 13A, 13B, and 13C Will be described with reference to FIG. 13A, 13B, and 13C show examples in which all PUSH transmission instructions cancel all the segments scheduled to be PUSH transmitted. Reference numerals 1301 to 1313 in FIGS. 13A, 13B, and 13C are the same as reference numerals 1101 to 1113 in FIGS. 11A, 11B, and 11C. Further, the processing from S601 to 605 in FIG. 6 and S701 to 705 in FIG. 7 is the same as the processing described with reference to FIGS. 11A, 11B, 11C, and FIGS.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１３１６をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１３１４を送信装置１０１へ送信する。ＰＵＳＨ送信キャンセル指示１３１６は、ＰＵＳＨ送信指示１３０２及び１３０３の両方によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルする内容のキャンセル指示である。リクエスト１３１４のｐａｔｈヘッダーに、現在送信装置１０１が採用している全てのＰＵＳＨ送信指示を指す識別子１３１５（"ｐｕｓｈ"）を指定する。この識別子１３１５は、事前に送信装置１０１がＭＰＤに記載することなどにより、受信装置１０２へ事前に通知する。この方式以外に、全てのＰＵＳＨ送信指示を指定する識別子を各ＰＵＳＨ送信指示に割り振る識別子の形式から分かるようにしてもよい。例えば、各ＰＵＳＨ送信部に割り振る識別子は"文字列＋数値"の形式を取るものとする。そして、各ＰＵＳＨ送信指示に割り振る識別子の数値部を取り除いた文字列部分のみのものが全てのＰＵＳＨ送信指示を指定するための識別子を表すようにしてもよい。送信装置１０１と受信装置１０２とは、このルールを予め共有しておく。図１３Ａ，１３Ｂ，１３ＣでＰＵＳＨ送信指示１３０２と１３０３に割り振った各識別子１３０６と１３０８はそれぞれ"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ１"と"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ２"である。受信装置１０２は全てのＰＵＳＨ送信指示を指定するための識別子は数値を除いた"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ"ということが分かる。 In S706, the communication unit 308 of the reception apparatus 102 transmits a request 1314 including the PUSH transmission cancel instruction 1316 in the accept-push-policy header to the transmission apparatus 101. The PUSH transmission cancel instruction 1316 is a cancel instruction for canceling all segments scheduled to be PUSH transmitted by both the PUSH transmission instructions 1302 and 1303. In the path header of the request 1314, an identifier 1315 ("push") indicating all the PUSH transmission instructions currently used by the transmission apparatus 101 is designated. This identifier 1315 is notified to the receiving apparatus 102 in advance by, for example, the transmitting apparatus 101 describing it in the MPD. In addition to this method, an identifier for designating all PUSH transmission instructions may be understood from the format of the identifier assigned to each PUSH transmission instruction. For example, it is assumed that the identifier assigned to each PUSH transmission unit takes the form of “character string + numerical value”. Then, only the character string portion obtained by removing the numerical value part of the identifier assigned to each PUSH transmission instruction may represent an identifier for designating all the PUSH transmission instructions. The transmission apparatus 101 and the reception apparatus 102 share this rule in advance. The identifiers 1306 and 1308 assigned to the PUSH transmission instructions 1302 and 1303 in FIGS. 13A, 13B, and 13C are “/ example / tmp / push1” and “/ example / tmp / push2”, respectively. It can be seen that the identifier for designating all PUSH transmission instructions is “/ example / tmp / push” excluding numerical values.
　Ｓ６０６において、送信装置１０１の通信部２０７はＰＵＳＨ送信キャンセル指示１３１６を含むリクエスト１３１４を受信する。 In S606, the communication unit 207 of the transmission apparatus 101 receives the request 1314 including the PUSH transmission cancel instruction 1316.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１３１５から判定したキャンセル対象の一つであるＰＵＳＨ送信指示１３０２によるＰＵＳＨ予定のセグメントのうち、未送信のセグメントをキャンセル候補と特定する。この例では、未送信のセグメントの一つであるｓｅｇｍｅｎｔＡ３をキャンセル候補セグメントと特定している。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies an untransmitted segment as a cancellation candidate among the PUSH scheduled segments based on the PUSH transmission instruction 1302 that is one of the cancellation targets determined from the identifier 1315. In this example, segment A3, which is one of the untransmitted segments, is specified as a cancel candidate segment.
　Ｓ６０８において、キャンセル候補セグメントであるｓｅｇｍｅｎｔＡ３が、ＰＵＳＨ送信指示１３０２以外で送信装置１０１が採用しているＰＵＳＨ送信指示１３０３によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, it is determined that segment A3, which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1303 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1302 (NO in S608), and the process proceeds to S609. .
　Ｓ６０９において、送信装置１０１の指示管理部２０６はセグメント決定部２０５へｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１３１０による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１３１９の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1310 has already been completed, transmission of RST_STREAM 1319 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１３１６によるＰＵＳＨ送信指示１３０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。
Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は１３０２以外に１３０３があるため（Ｓ６１１でＮＯ）、Ｓ６０７へ遷移する。 In S610, it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1302 by the PUSH transmission cancellation instruction 1316 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
In S611, since there are 1303 PUSH transmission instructions to be canceled other than 1302 (NO in S611), the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１３１５から判定したキャンセル対象の一つであるＰＵＳＨ送信指示１３０３がＰＵＳＨ予定のセグメントのうち、その中の一つであるｓｅｇｍｅｎｔＢ２をキャンセル候補セグメントと特定する。 In step S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies segment B <b> 2, which is one of the PUSH scheduled segments whose PUSH transmission instruction 1303, which is one of the cancellation targets determined from the identifier 1315, as a cancel candidate segment. To do.
　Ｓ６０８において、キャンセル候補セグメントであるｓｅｇｍｅｎｔＢ２が、ＰＵＳＨ送信指示１３０３以外で送信装置１０１が採用しているＰＵＳＨ送信指示１３０２によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, it is determined that segment B2, which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1302 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1303 (NO in S608), and the process proceeds to S609. .
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｓｅｇｍｅｎｔＢ２のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５は、ｓｅｇｍｅｎｔＢ２のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１３１１による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１３２０の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B2, and the segment determination unit 205 cancels the PUSH transmission of the segment B2. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1311 has already been completed, transmission of RST_STREAM 1320 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１３１６によるＰＵＳＨ送信指示１３０３のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定し（Ｓ６１０でＮＯ）、Ｓ６０７へ遷移する。 In S610, it is determined that cancellation is not performed for all cancel candidate segments of the PUSH transmission instruction 1303 according to the PUSH transmission cancellation instruction 1316 and cancellation processing is not performed (NO in S610), and the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は識別子１３１５から判定したキャンセル対象の一つであるＰＵＳＨ送信指示１３０３がＰＵＳＨ予定のセグメントのうち、その中の一つであるｓｅｇｍｅｎｔＢ３をキャンセル候補セグメントと特定する。 In step S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies segment B <b> 3, which is one of the PUSH transmission instructions 1303, which is one of the cancellation targets determined from the identifier 1315, as a cancel candidate segment. To do.
　Ｓ６０８において、キャンセル候補セグメントであるｓｅｇｍｅｎｔＢ３が、ＰＵＳＨ送信指示１３０３以外で送信装置１０１が採用しているＰＵＳＨ送信指示１３０２によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, it is determined that segment B3, which is a cancellation candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1302 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1303 (NO in S608), and the process proceeds to S609. .
　Ｓ６０９において、送信装置１０１の指示管理部２０６はセグメント決定部２０５へｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１３１２による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１３２１の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment B3, and the segment determination unit 205 cancels the PUSH transmission of the segment B3. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1312 has already been completed, transmission of RST_STREAM 1321 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１３１６によるＰＵＳＨ送信指示１３０３のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1303 according to the PUSH transmission cancellation instruction 1316 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、ＰＵＳＨ送信キャンセル指示１３１６が対象とする全てのＰＵＳＨ送信指示に対してキャンセルを行ったと判定し（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, it is determined that the PUSH transmission cancel instruction 1316 has canceled all the PUSH transmission instructions (YES in S611), and the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７はＰＵＳＨ送信キャンセル指示１３１６に対する応答１３１８をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１３１７を受信装置１０２へ送信する。この応答１３１８は、ＰＵＳＨ送信キャンセル指示１３１６と同様の内容を有する。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1317 including a response 1318 to the PUSH transmission cancel instruction 1316 in the push-policy header to the reception apparatus 102. This response 1318 has the same content as the PUSH transmission cancel instruction 1316.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示の応答１３１８を含むレスポンス１３１７を送信装置１０１から受信する。 In step S <b> 707, the communication unit 308 of the reception apparatus 102 receives a response 1317 including a PUSH transmission cancel instruction response 1318 from the transmission apparatus 101.
　キャンセルされたｓｅｇｍｅｎｔＡ３、ｓｅｇｍｅｎｔＢ２及びｓｅｇｍｅｎｔＢ３に対して、送信装置１０１は受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ１３１０から１３１２を送信している。そのため、これらをキャンセルするために、送信装置１０１はＲＳＴ＿ＳＴＲＥＡＭ１３１９から１３２１を送信し、受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１３１９から１３２１はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 For the canceled segment A3, segment B2, and segment B3, the transmitting apparatus 101 transmits PUSH_PROMISE 1310 to 1312 to the receiving apparatus 102. Therefore, in order to cancel these, the transmission apparatus 101 transmits RST_STREAM 1319 to 1321, and the reception apparatus 102 receives this. The RST_STREAM 1319 to 1321 may be transmitted by the receiving apparatus 102 before S706 or after S707.
　動作例６では、複数のＰＵＳＨ送信指示が要求された場合に、各ＰＵＳＨ送信指示のＰＵＳＨ送信をキャンセルするために、ＰＵＳＨ送信指示に共通の識別子を使用することで、余分なトランザクションを不要とする例を説明した。 In the operation example 6, when a plurality of PUSH transmission instructions are requested, in order to cancel the PUSH transmission of each PUSH transmission instruction, an extra transaction is unnecessary by using a common identifier for the PUSH transmission instruction. An example was explained.
　（動作例７）
　次に、ＨＴＴＰ／２上で、ＵＲＬ形式の識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定全てのセグメントをキャンセルしつつ、別のＰＵＳＨ送信指示を行う例について、図１４Ａ，１４Ｂを参照して説明する。 (Operation example 7)
Next, an example of designating another PUSH transmission instruction while designating a PUSH transmission instruction to be canceled by an identifier in the URL format on HTTP / 2, canceling all the segments scheduled to be pushed by the PUSH transmission instruction, is shown in FIG. A description will be given with reference to 14A and 14B.
　図１４Ａ，１４Ｂの１４０１から１４０４は８０１から８０４と同様であり、１４０５から１４０７は８０６から８０８と同様である。また、図６のＳ６０１から６０５及び図７のＳ７０１から７０５は図８Ａ，８Ｂと内容が同じであるため説明は省略する。図１４Ａ，１４Ｂのレスポンス１４０３には図８Ａ，８Ｂの８０５に相当する記載がないことからわかるように、図８Ａ，８Ｂとは異なり図１４Ａ，１４ＢではＰＵＳＨ送信指示１４０２に対し識別子を割り振っていないが、図８Ａ，８Ｂと同様に割り振ってもよい。 In FIGS. 14A and 14B, 1401 to 1404 are the same as 801 to 804, and 1405 to 1407 are the same as 806 to 808. Moreover, since S601 to 605 in FIG. 6 and S701 to 705 in FIG. 7 are the same as those in FIGS. 8A and 8B, description thereof will be omitted. As can be seen from the fact that the response 1403 in FIGS. 14A and 14B has no description corresponding to 805 in FIGS. 8A and 8B, unlike FIGS. 8A and 8B, no identifier is assigned to the PUSH transmission instruction 1402 in FIGS. 14A and 14B. However, they may be allocated in the same manner as in FIGS. 8A and 8B.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１４１０をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１４０８を送信装置１０１へ送信する。ＰＵＳＨ送信キャンセル指示１４１０は、対象とするＰＵＳＨ送信指示によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルする内容を有する。ＰＵＳＨ送信キャンセル指示１４１０は、キャンセル対象とするＰＵＳＨ送信指示を指定するために、ＰＵＳＨ送信指示１４０２を指示した際に指定したＵＲＬである"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"１４１１を含む。図１４Ａ，１４Ｂの例では、ＰＵＳＨ送信キャンセル指示１４１０の後ろに"ｐａｔｈ"というプレフィックスと共にＵＲＬ１４１１を含んでいる。このプレフィックスは"ｐａｔｈ"に限定しない。またこのプレフィックスはなくてもよい。 In step S706, the communication unit 308 of the reception apparatus 102 transmits a request 1408 including the PUSH transmission cancel instruction 1410 in the accept-push-policy header to the transmission apparatus 101. The PUSH transmission cancel instruction 1410 has a content for canceling all the segments scheduled to be PUSH transmitted by the target PUSH transmission instruction. The PUSH transmission cancel instruction 1410 includes “/ example / tmp / segmentA1” 1411 which is a URL specified when the PUSH transmission instruction 1402 is instructed in order to specify a PUSH transmission instruction to be canceled. In the example of FIGS. 14A and 14B, the URL 1411 is included behind the PUSH transmission cancel instruction 1410 together with the prefix “path”. This prefix is not limited to “path”. This prefix may not be necessary.
　ＵＲＬの代わりにＰＵＳＨ送信指示を区別できる他の値を含めてもよい。キャンセル対象のＰＵＳＨ送信指示をＵＲＬ１４１１により指定する代わりに、リスト形式やテンプレート形式により、キャンセルしたいセグメントを直接指定してもよい。キャンセル対象をリスト形式で指定する場合、１４１０に"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｃａｎｃｅｌ－ｌｉｓｔ"の様なリスト形式を示すキャンセル指示を指定してもよい。そして１４１１の代わりに「"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ３"；"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ４"；"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ５"；"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ６"」の様な形式を指定する。 Other values that can distinguish the PUSH transmission instruction may be included instead of the URL. Instead of specifying the PUSH transmission instruction to be canceled by the URL 1411, the segment to be canceled may be directly specified by a list format or a template format. When specifying the cancellation target in a list format, a cancel instruction indicating a list format such as “urn: sample: push-cancel-list” may be specified in 1410. Instead of 1411, a format such as "" / example / tmp / segmentA3 ";" / example / tmp / segmentA4 ";" / example / tmp / segmentA5 ";" / example / tmp / segmentA6 "" is specified.
　キャンセル対象をテンプレート形式で指定する場合、１４１０に"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｃａｎｃｅｌ－ｔｅｍｐｌｅｔｅ"の様なテンプレート形式を示すキャンセル指示を指定してもよい。そして１４１１の代わりに「／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ｛％ｄ｝；｛３，４，５，６｝」や「／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ｛％ｄ｝；｛３ー６｝」の様な形式を指定する。 When the cancellation target is specified in the template format, a cancel instruction indicating a template format such as “urn: sample: push-cancel-template” may be specified in 1410. Then, instead of 1411, a format such as “/ example / tmp / segmentA {% d}; {3,4,5,6}” or “/ example / tmp / segmentA {% d}; {3-6}” Is specified.
　受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示とは別に、新しく設定するＰＵＳＨ送信指示１４１２をリクエスト１４０８に含んでいる。ａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのＰＵＳＨ送信キャンセル指示１４１０及び１４１１の後ろにＰＵＳＨ送信指示１４１２を含む。１４１０及び１４１１の前にＰＵＳＨ送信指示１４１２を含めてもよい。ｐａｔｈヘッダーに、新しく設定するＰＵＳＨ送信指示１４１２実行時のベースとなるＵＲＬ１４０９を含める。図１４Ａ，１４Ｂの例では、ｐａｔｈヘッダーに指定しているＵＲＬが"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＢ３"であり、ＰＵＳＨ送信指示１４２３は、連続する四つのセグメントのＰＵＳＨ送信を要求するものである。したがって、ＰＵＳＨ送信指示１４１２は、ｓｅｇｍｅｎｔＢ３から再生時間的に連続する四つのセグメントｓｅｇｍｅｎｔＢ４～ｓｅｇｍｅｎｔＢ７をＰＵＳＨ送信するよう指示する内容を有する。 The communication unit 308 of the receiving apparatus 102 includes a PUSH transmission instruction 1412 to be newly set in the request 1408 separately from the PUSH transmission cancellation instruction. A PUSH transmission instruction 1412 is included after the PUSH transmission cancellation instructions 1410 and 1411 in the accept-push-policy header. A PUSH transmission instruction 1412 may be included before 1410 and 1411. In the path header, a URL 1409 that is a base for executing the PUSH transmission instruction 1412 to be newly set is included. In the example of FIGS. 14A and 14B, the URL specified in the path header is “/ example / tmp / segment B3”, and the PUSH transmission instruction 1423 requests PUSH transmission of four consecutive segments. Therefore, the PUSH transmission instruction 1412 has a content for instructing PUSH transmission of the four segments segmentB4 to segmentB7 that are continuous from the segmentB3 in terms of reproduction time.
　図６のＳ６０６からＳ６１１の処理は、図８Ａ，８Ｂを参照して説明した処理の内容が同様であるため説明は省略する。 6 is the same as the processing described with reference to FIGS. 8A and 8B, and thus the description thereof is omitted.
　Ｓ６１２において、送信装置１０１の通信部２０７はＰＵＳＨ送信キャンセル指示１４１０及びＰＵＳＨ送信指示１４１２に対する応答１４１４をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１４１５を受信装置１０２へ送信する。この応答１４１４は、１４１０、１４１１及び１４１２と同じ内容を有する。 In S612, the communication unit 207 of the transmission apparatus 101 transmits to the reception apparatus 102 a response 1415 that includes a push-policy header in response 1414 to the PUSH transmission cancel instruction 1410 and the PUSH transmission instruction 1412. This response 1414 has the same content as 1410, 1411 and 1412.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１４１０とＰＵＳＨ送信指示１４１２の応答１４１４と、ｓｅｇｍｅｎｔＢ３のバイナリデータを含むレスポンス１４１３を受信する。 In S707, the communication unit 308 of the receiving apparatus 102 receives the PUSH transmission cancel instruction 1410, the PUSH transmission instruction 1412 response 1414, and the response 1413 including the segment B3 binary data.
　キャンセルされたｓｅｇｍｅｎｔＡ３に対して、送信装置１０１は、受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ１４０６を送信している。そのため、送信装置１０１は、これをキャンセルするためにＲＳＴ＿ＳＴＲＥＡＭ１４１５を送信し、受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１４１５はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 The transmitting apparatus 101 transmits PUSH_PROMISE 1406 to the receiving apparatus 102 for the canceled segment A3. Therefore, the transmission apparatus 101 transmits RST_STREAM 1415 to cancel this, and the reception apparatus 102 receives this. This RST_STREAM 1415 may be transmitted by the receiving apparatus 102 before S706 or after S707.
　Ｓ６１２以降、送信装置１０１はＰＵＳＨ送信指示１４１２を元に新たにＰＵＳＨ送信を開始する。すなわち、送信装置１０１は、ｓｅｇｍｅｎｔＢ４～ｓｅｇｍｅｎｔＢ７のＰＵＳＨ送信を開始する。 After S612, the transmitting apparatus 101 newly starts PUSH transmission based on the PUSH transmission instruction 1412. That is, the transmission apparatus 101 starts PUSH transmission of segment B4 to segment B7.
　動作例７では、識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定全てのセグメントをキャンセルしつつ、別のＰＵＳＨ送信指示を行う例を説明した。動作例７においても、識別子によりＰＵＳＨ送信指示を指定することで、キャンセル対象を特定するために余分なトランザクションを必要とせずに、ＰＵＳＨ送信のキャンセルを行うことが可能である。 In the operation example 7, the PUSH transmission instruction to be canceled is specified by the identifier, and the example in which another PUSH transmission instruction is performed while canceling all the segments scheduled to be pushed by the PUSH transmission instruction has been described. Also in the operation example 7, by specifying the PUSH transmission instruction by the identifier, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancellation target.
　（動作例８）
　次に、ＨＴＴＰ／２上で、複数のＰＵＳＨ送信指示を要求し採用された後で、ＵＲＬ形式の識別子によりキャンセル対象として全てのＰＵＳＨ送信指示を指定し、各ＰＵＳＨ送信指示がＰＵＳＨ送信する予定の全てのセグメントをキャンセルする例を説明する。このキャンセルと合わせて新しいＰＵＳＨ送信指示を行う例について、図１５Ａ，１５Ｂ，１５Ｃを参照して説明する。 (Operation example 8)
Next, after requesting and adopting a plurality of PUSH transmission instructions on HTTP / 2, all PUSH transmission instructions are designated as cancellation targets by identifiers in the URL format, and each PUSH transmission instruction is scheduled to be PUSH transmitted. An example of canceling all segments will be described. An example in which a new PUSH transmission instruction is issued together with this cancellation will be described with reference to FIGS. 15A, 15B, and 15C.
　図１５Ａ，１５Ｂ，１５Ｃにおいて、１５０１から１５１３は図１１Ａ，１１Ｂ，１１Ｃの１１０１から１１１３と同様である。また図６のＳ６０１からＳ６０５及び図７のＳ７０１からＳ７０５処理は、図１１Ａ，１１Ｂ，１１Ｃ、図８Ａ，８Ｂを参照して説明した処理の内容と同様であるため説明は省略する。 15A, 15B, and 15C, reference numerals 1501 to 1513 are the same as 1101 to 1113 in FIGS. 11A, 11B, and 11C. 6 are the same as the processing described with reference to FIGS. 11A, 11B, 11C, and 8A, 8B, and thus description thereof is omitted.
　Ｓ７０６において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１５１６をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１５１４を送信装置１０１へ送信する。ＰＵＳＨ送信キャンセル指示１５１６は、対象とするＰＵＳＨ送信指示によりＰＵＳＨ送信する予定の全てのセグメントをキャンセルする内容を有する。ＰＵＳＨ送信キャンセル指示１５１６は、キャンセル対象とするＰＵＳＨ送信指示を指定するために、ＰＵＳＨ送信指示１５０２、１５０３を指示した際に指定したＵＲＬである"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"１５１７を含む。ＵＲＬ１５１７を指定することにより、"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"を指定して要求を出したＰＵＳＨ送信指示を全てキャンセル対象とする。図１５Ａ，１５Ｂ，１５Ｃでは、ｓｅｇｍｅｎｔＡ２、ｓｅｇｍｅｎｔＡ３だけでなく、ｓｅｇｍｅｎｔＢ２、ｓｅｇｍｅｎｔＢ３も"：ｐａｔｈ＝／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＡ１"のパス名に基づき要求されている。すなわち、ＰＵＳＨ送信指示１５０２、１５０３は、いずれも同一のリソース"ｓｅｇｍｅｎｔＡ１"を利用している。そのため、ＰＵＳＨ送信キャンセル指示１５１６において、ＰＵＳＨ送信指示１５０２と１５０３の両方がキャンセル対象となる。 In S706, the communication unit 308 of the reception apparatus 102 transmits a request 1514 including the PUSH transmission cancel instruction 1516 in the accept-push-policy header to the transmission apparatus 101. The PUSH transmission cancel instruction 1516 has a content for canceling all the segments scheduled to be PUSH transmitted by the target PUSH transmission instruction. The PUSH transmission cancel instruction 1516 includes “/ example / tmp / segmentA1” 1517 that is a URL specified when the PUSH transmission instructions 1502 and 1503 are instructed in order to specify a PUSH transmission instruction to be canceled. By specifying the URL 1517, all PUSH transmission instructions that specify "/ example / tmp / segmentA1" and make a request are subject to cancellation. 15A, 15B, and 15C, not only segment A2 and segment A3, but also segment B2 and segment B3 are requested based on the path name of “: path = / example / tmp / segmentA1”. In other words, the PUSH transmission instructions 1502 and 1503 both use the same resource “segmentA1”. Therefore, in the PUSH transmission cancel instruction 1516, both the PUSH transmission instructions 1502 and 1503 are to be canceled.
　ＰＵＳＨ送信キャンセル指示１５１６の後ろに"ｐａｔｈ"というプレフィックスと共にＵＲＬ１５１７を含める。このプレフィックスは"ｐａｔｈ"に限定しない。またこのプレフィックスはなくてもよい。ＵＲＬの代わりにＰＵＳＨ送信指示を区別できる他の値を含めてもよい。キャンセル対象のＰＵＳＨ送信指示をＵＲＬ１５１７により指定する代わりに、リスト形式やテンプレート形式により、キャンセルしたいセグメントを直接指定してもよい。受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示とは別に、新しく設定するＰＵＳＨ送信指示１５１８をリクエスト１５１４に含める。図１５Ａ，１５Ｂ，１５Ｃの例では、ａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのＰＵＳＨ送信キャンセル指示１５１６及び１５１７の後ろにＰＵＳＨ送信指示１５１８を含んでいる。ＰＵＳＨ送信キャンセル指示１５１６及び１５１７の前にＰＵＳＨ送信指示１５１８が配置されてもよい。ｐａｔｈヘッダーに、新しく設定するＰＵＳＨ送信指示１５１８実行時のベースとなるＵＲＬ１５１５を含める。ｐａｔｈヘッダーに指定しているＵＲＬが"／ｅｘａｍｐｌｅ／ｔｍｐ／ｓｅｇｍｅｎｔＣ３"なので、ＰＵＳＨ送信指示１５１８はｓｅｇｍｅｎｔＣ３から再生時間的に連続する次の四つのセグメント（Ｃ４～Ｃ７）をＰＵＳＨ送信するよう指示する内容となる。 Include URL 1517 with the prefix “path” behind the PUSH transmission cancel instruction 1516. This prefix is not limited to “path”. This prefix may not be necessary. Other values that can distinguish the PUSH transmission instruction may be included instead of the URL. Instead of specifying the PUSH transmission instruction to be canceled by the URL 1517, the segment to be canceled may be directly specified by a list format or a template format. The communication unit 308 of the receiving apparatus 102 includes a PUSH transmission instruction 1518 to be newly set in the request 1514 separately from the PUSH transmission cancellation instruction. In the example of FIGS. 15A, 15B, and 15C, a PUSH transmission instruction 1518 is included after the PUSH transmission cancellation instructions 1516 and 1517 in the accept-push-policy header. A PUSH transmission instruction 1518 may be arranged before the PUSH transmission cancellation instructions 1516 and 1517. In the path header, a URL 1515 serving as a base when the PUSH transmission instruction 1518 to be newly set is executed is included. Since the URL specified in the path header is “/ example / tmp / segmentC3”, the PUSH transmission instruction 1518 is an instruction to push the next four segments (C4 to C7) consecutive in playback time from the segment C3. It becomes.
　図６のＳ６０６からＳ６１１の処理は、図８Ａ，８Ｂを参照して説明した処理と内容が同様であるため説明は省略する。 The processing from S606 to S611 in FIG. 6 is the same as the processing described with reference to FIGS.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１５１６及びＰＵＳＨ送信指示１５１８に対する応答１５２０をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１５１９を受信装置１０２へ送信する。応答１５２０は、ＰＵＳＨ送信キャンセル指示１５１６、１５１７及びＰＵＳＨ送信指示１５１８と同様の内容を有する。レスポンス１５１９はｓｅｇｍｅｎｔＣ３のバイナリデータを含む。また送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示１５１８に対し"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ３"という識別子１５２１を割り振る。そしてレスポンス１５１９のｐｕｓｈ－ｐｏｌｉｃｙヘッダーに、識別子１５２１を含める。識別子１５２１の前に"ｐｕｓｈ－ＵＲＬ"というプレフィックスを入れることで、ｐｕｓｈ－ｐｏｌｉｃｙヘッダーのどこからが識別子１５２１なのかを区別できるようにしている。このプレフィックスは"ｐｕｓｈ－ＵＲＬ"に限定しない。 In step S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1519 including a response 1520 to the PUSH transmission cancellation instruction 1516 and the PUSH transmission instruction 1518 in the push-policy header to the reception apparatus 102. The response 1520 has the same contents as the PUSH transmission cancel instructions 1516 and 1517 and the PUSH transmission instruction 1518. The response 1519 includes segment C3 binary data. Further, the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1521 of “/ example / tmp / push3” to the received PUSH transmission instruction 1518. Then, the identifier 1521 is included in the push-policy header of the response 1519. By inserting a “push-URL” prefix in front of the identifier 1521, it is possible to distinguish where the identifier 1521 is from the push-policy header. This prefix is not limited to “push-URL”.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示１５１６とＰＵＳＨ送信指示１５１８の応答１５２１を含むレスポンス１５１９を送信装置１０１から受信する。キャンセルされたｓｅｇｍｅｎｔＡ３、ｓｅｇｍｅｎｔＢ２及びｓｅｇｍｅｎｔＢ３に対して送信装置１０１は、ＰＵＳＨ＿ＰＲＯＭＩＳＥ１５１０から１５１２を受信装置１０２へ送信している。そのため、これらをキャンセルするために、送信装置１０１はＲＳＴ＿ＳＴＲＥＡＭ１５２２から１５２４を送信し、受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１５２２から１５２４はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 In step S <b> 707, the communication unit 308 of the reception apparatus 102 receives a response 1519 including a PUSH transmission cancel instruction 1516 and a PUSH transmission instruction 1518 response 1521 from the transmission apparatus 101. The transmitting apparatus 101 transmits PUSH_PROMISE 1510 to 1512 to the receiving apparatus 102 for the canceled segment A3, segment B2, and segment B3. Therefore, in order to cancel these, the transmission apparatus 101 transmits RST_STREAM 1522 to 1524, and the reception apparatus 102 receives this. These RST_STREAMs 1522 to 1524 may be transmitted by the receiving apparatus 102 before S706 or after S707.
　Ｓ６１２以降、送信装置１０１はＰＵＳＨ送信指示１５１８を元に新たにＰＵＳＨ送信を開始する。 After S612, the transmission apparatus 101 newly starts PUSH transmission based on the PUSH transmission instruction 1518.
　動作例８では、複数のＰＵＳＨ送信指示を要求し採用された後で、識別子によりキャンセル対象として全てのＰＵＳＨ送信指示を指定する例を説明した。動作例８においても、キャンセル対象を特定するために余分なトランザクションを必要とせずに、ＰＵＳＨ送信のキャンセルを行うことが可能である。 In the operation example 8, after requesting and adopting a plurality of PUSH transmission instructions, an example in which all the PUSH transmission instructions are designated as cancellation targets by an identifier has been described. Also in the operation example 8, it is possible to cancel the PUSH transmission without requiring an extra transaction for specifying the cancel target.
　（動作例９）
　次に、ＷｅｂＳｏｃｋｅｔ上で、ＵＲＬ形式の識別子によりキャンセルすべきＰＵＳＨ送信指示を指定し、ＰＵＳＨ送信指示によりＰＵＳＨする予定全てのセグメントをキャンセルする例について、図１６を参照して説明する。 (Operation example 9)
Next, an example in which a PUSH transmission instruction to be canceled is specified by an identifier in the URL format on the WebSocket, and all the segments scheduled to be pushed by the PUSH transmission instruction are canceled will be described with reference to FIG.
　識別子は送信装置１０１が割り振るものとして、受信装置１０２はＳ７０１の処理をスキップする。 The identifier is assigned by the transmitting apparatus 101, and the receiving apparatus 102 skips the processing of S701.
　Ｓ７０２において、受信装置１０２の通信部３０８は、送信装置１０１へＰＵＳＨ送信指示１６０２を含むリクエスト１６０１を送信する。ＰＵＳＨ送信指示は"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｎｅｘｔ；２"という文字列を、"ｐｕｓｈ＿ｄｉｒｅｃｔｉｖｅ"というプレフィックスの後ろに含めている。このプレフィックスは"ｐｕｓｈ＿ｄｉｒｅｃｔｉｖｅ"に限定しない。リクエスト１６０１はｓｅｇｍｅｎｔＡ１をリクエストするメッセージであり、ｓｅｇｍｅｎｔＡ１から再生時間的に連続する次の二つのセグメントをＰＵＳＨ送信するようＰＵＳＨ送信指示１６０２で指示している。 In S <b> 702, the communication unit 308 of the reception apparatus 102 transmits a request 1601 including a PUSH transmission instruction 1602 to the transmission apparatus 101. The PUSH transmission instruction includes a character string “urn: sample: push-next; 2” after the prefix “push_directive”. This prefix is not limited to “push_directive”. A request 1601 is a message for requesting segment A1, and the PUSH transmission instruction 1602 instructs the segment A1 to perform PUSH transmission of the next two segments that are continuous in playback time.
　Ｓ６０１において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示１６０２を含むリクエスト１６０１を受信装置１０２から受信する。 In step S <b> 601, the communication unit 207 of the transmission apparatus 101 receives a request 1601 including a PUSH transmission instruction 1602 from the reception apparatus 102.
　Ｓ６０２において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示１６０２に対し"／ｅｘａｍｐｌｅ／ｔｍｐ／ｐｕｓｈ１"という識別子１６０５を割り振る。図１６の例では、識別子はＵＲＬの形式を採用している。 In S602, the instruction management unit 206 of the transmission apparatus 101 allocates an identifier 1605 of “/ example / tmp / push1” to the received PUSH transmission instruction 1602. In the example of FIG. 16, the identifier adopts the URL format.
　Ｓ６０３において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示１６０２に対する応答１６０４と、を含むレスポンスをｓｅｇｍｅｎｔＡ１のバイナリデータを含むレスポンス１６０３を受信装置１０２へ送信する。この応答１６０４は、ＰＵＳＨ送信指示１６０２と同様の内容を有する。ＰＵＳＨ送信指示の応答１６０４は、"ｐｕｓｈ＿ａｃｋ"というプレフィックスの後ろに含めている。このプレフィックスは"ｐｕｓｈ＿ａｃｋ"に限定しない。ＰＵＳＨ送信指示の応答１６０６と対応させて識別子１６０５を含める。識別子１６０５は"ｐｕｓｈ＿ｕｒｌ＝"というプレフィックスの後ろに含めている。このプレフィックスは"ｐｕｓｈ＿ｕｒｌ＝"に限定しない。 In S603, the communication unit 207 of the transmission apparatus 101 transmits a response 1603 including a response 1604 to the PUSH transmission instruction 1602 to the reception apparatus 102, including a response 1603 including the binary data of the segment A1. This response 1604 has the same content as the PUSH transmission instruction 1602. The PUSH transmission instruction response 1604 is included after the prefix “push_ack”. This prefix is not limited to “push_ack”. An identifier 1605 is included in correspondence with the PUSH transmission instruction response 1606. The identifier 1605 is included after the prefix “push_url =”. This prefix is not limited to “push_url =”.
　Ｓ６０４において、送信装置１０１の指示管理部２０６は、受信したＰＵＳＨ送信指示１６０２と識別子１６０５を紐づけて保持する。 In S604, the instruction management unit 206 of the transmission apparatus 101 holds the received PUSH transmission instruction 1602 and the identifier 1605 in association with each other.
　Ｓ７０３において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示１６０２の応答１６０４を含むレスポンス１６０３を受信する。 In S703, the communication unit 308 of the receiving apparatus 102 receives a response 1603 including a response 1604 of the PUSH transmission instruction 1602.
　Ｓ７０４において、受信装置１０２の指示管理部３０６は、応答が返ってきて受理されたＰＵＳＨ送信指示１６０２を識別子１６０５と紐づけて保持する。 In step S <b> 704, the instruction management unit 306 of the reception apparatus 102 holds the PUSH transmission instruction 1602 received after the response is returned in association with the identifier 1605.
　Ｓ６０５において、送信装置１０１はＰＵＳＨ送信を開始し、ｓｅｇｍｅｎｔＡ２のＰＵＳＨ送信として、送信装置１０１の通信部２０７は、ｓｅｇｍｅｎｔＡ２のバイナリデータを含むレスポンス１６０６を受信装置１０２へ送信する。 In S605, the transmission apparatus 101 starts the PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1606 including the binary data of the segment A2 to the reception apparatus 102 as the PUSH transmission of the segment A2.
　Ｓ７０５において、受信装置１０２の通信部３０８は、レスポンス１６０６を受信する。 In S705, the communication unit 308 of the reception apparatus 102 receives the response 1606.
　Ｓ７０６において、受信装置１０２の通信部３０８はＰＵＳＨ送信指示１６０２によりＰＵＳＨ送信する予定の全てのセグメントに対するＰＵＳＨ送信キャンセル指示１６０８をリクエスト１６０７として送信する。識別子１６０５を指定することでキャンセルしたいＰＵＳＨ送信対象を指定する。識別子１６０５は"ｓｅｇｍｅｎｔ＿ｕｒｉ"というプレフィックスの後ろに置かれている。このプレフィックスは"ｓｅｇｍｅｎｔ＿ｕｒｉ"に限定されない。 In S <b> 706, the communication unit 308 of the receiving apparatus 102 transmits, as a request 1607, a PUSH transmission cancel instruction 1608 for all segments scheduled to be PUSH transmitted in accordance with the PUSH transmission instruction 1602. By specifying the identifier 1605, the PUSH transmission target to be canceled is specified. The identifier 1605 is placed after the prefix “segment_uri”. This prefix is not limited to “segment_uri”.
　Ｓ６０６において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１６０８を含むリクエスト１６０７を受信装置１０２から受信する。 In S606, the communication unit 207 of the transmission apparatus 101 receives the request 1607 including the PUSH transmission cancel instruction 1608 from the reception apparatus 102.
　Ｓ６０７において、送信装置１０１の指示管理部２０６は、識別子１６０５から判定したキャンセル対象であるＰＵＳＨ送信指示１６０２によるＰＵＳＨ予定のセグメントで、その中の一つであるｓｅｇｍｅｎｔＡ３をキャンセル候補セグメントと特定する。送信装置１０１においてＰＵＳＨ送信指示１６０２以外で指示されているＰＵＳＨ送信指示はないため、Ｓ６０８をスキップしＳ６０９へ遷移する。 In S607, the instruction management unit 206 of the transmission apparatus 101 identifies segment A3, which is one of the PUSH scheduled segments based on the PUSH transmission instruction 1602 to be canceled determined from the identifier 1605, as a cancel candidate segment. Since there is no PUSH transmission instruction other than the PUSH transmission instruction 1602 in the transmission apparatus 101, S608 is skipped and the process proceeds to S609.
　Ｓ６０９において、送信装置１０１の指示管理部２０６はセグメント決定部２０５へｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルする。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the PUSH transmission of the segment A3, and the segment determination unit 205 cancels the PUSH transmission of the segment A3.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１６０８によるＰＵＳＨ送信指示１６０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all cancel candidate segments of the PUSH transmission instruction 1602 according to the PUSH transmission cancellation instruction 1608 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は１６０２のみであるため（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, since the PUSH transmission instruction to be canceled is only 1602 (YES in S611), the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１６０８に対する応答１６１０を含むレスポンス１６０９を受信装置１０２へ送信する。応答１６１０は、ＰＵＳＨ送信キャンセル指示１６０８と同じ内容を有する。ＰＵＳＨ送信キャンセル指示の応答１６１０は"ｐｕｓｈ＿ａｃｋ"というプレフィックスの後ろに置かれている。このプレフィックスは"ｐｕｓｈ＿ａｃｋ"に限定しない。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1609 including a response 1610 to the PUSH transmission cancel instruction 1608 to the reception apparatus 102. The response 1610 has the same content as the PUSH transmission cancel instruction 1608. The PUSH transmission cancel instruction response 1610 is placed behind the prefix “push_ack”. This prefix is not limited to “push_ack”.
　Ｓ７０７において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信キャンセル指示の応答１６１０を含むレスポンス１６０９を送信装置１０１から受信する。 In step S <b> 707, the communication unit 308 of the reception apparatus 102 receives a response 1609 including a PUSH transmission cancel instruction response 1610 from the transmission apparatus 101.
　動作例９ではＨＴＴＰ／２とＷｅｂＳｏｃｋｅｔにおける説明をしたが、ＱＵＩＣやその他ＰＵＳＨ機能を有するプロトコルに対しても本実施形態は適用可能である。 In the operation example 9, HTTP / 2 and WebSocket have been described, but the present embodiment can be applied to QUIIC and other protocols having a PUSH function.
　（動作例１０）
　ＨＴＴＰ／２上で、ＰＵＳＨ送信指示を要求した後で、ＰＵＳＨ送信キャンセルと新たなＰＵＳＨ送信指示を合わせて行う例について、図１７Ａ、図１７Ｂを参照して説明する。この例では、セグメントのデータの種類を識別子として使用するため、受信装置１０２がＰＵＳＨ送信指示に識別子を割り振るＳ７０１はスキップする。また、この例では"／ｅｘａｍｐｌｅ／ｖｉｄｅｏ／"＋セグメント名で映像データセグメントを、"／ｅｘａｍｐｌｅ／ａｕｄｉｏ／"＋セグメント名で音声データのセグメントを表すものとする。 (Operation example 10)
An example of performing a PUSH transmission cancellation and a new PUSH transmission instruction together after requesting a PUSH transmission instruction on HTTP / 2 will be described with reference to FIGS. 17A and 17B. In this example, since the data type of the segment is used as an identifier, S701 in which the receiving apparatus 102 allocates an identifier to the PUSH transmission instruction is skipped. In this example, it is assumed that a video data segment is represented by “/ example / video /” + segment name, and a segment of audio data is represented by “/ example / audio /” + segment name.
　Ｓ７０２において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示１７０２と１７０３をａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むリクエスト１７０１を送信装置１０１へ送信する。別々のａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーではなく、一つのａｃｃｅｐｔ－ｐｕｓｈ－ｐｏｌｉｃｙヘッダーに、ＰＵＳＨ送信指示１７０２と１７０３を含めてもよい。１７０２において、"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｎｅｘｔ"に続く数字"２"は、"／ｅｘａｍｐｌｅ／ｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ１"に続いて取得するセグメントの個数を指定している。したがって、受信装置１０２は、ＰＵＳＨ送信指示１７０２によってｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２及びｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信を要求している。また、１７０３において、"／ｅｘａｍｐｌｅ／ａｕｄｉｏ／ｓｅｇｍｅｎｔＡ（％０１ｄ）"に続く括弧内の二つの数字は、"（％０１ｄ）"が採りうる値の範囲により、要求対象のセグメントを特定している。１７０３の例では、"｛２，３｝"が範囲として指定されているから、ＰＵＳＨ送信指示１７０３によって、ａｕｄｉｏ／ｓｅｇｍｅｎｔＡ２及びａｕｄｉｏ／ｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信要求が行われている。 In S702, the communication unit 308 of the reception apparatus 102 transmits a request 1701 including PUSH transmission instructions 1702 and 1703 in the accept-push-policy header to the transmission apparatus 101. The PUSH transmission instructions 1702 and 1703 may be included in a single accept-push-policy header instead of separate accept-push-policy headers. In 1702, the number “2” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / video / segmentA1”. Therefore, the receiving apparatus 102 requests PUSH transmission of video / segment A2 and video / segment A3 by a PUSH transmission instruction 1702. Further, in 1703, the two numbers in parentheses following “/ example / audio / segmentA (% 01d)” identify the requested segment by the range of values that “(% 01d)” can take. . In the example of 1703, “{2, 3}” is specified as the range, and therefore, PUSH transmission requests for audio / segment A2 and audio / segment A3 are made in accordance with the PUSH transmission instruction 1703.
　Ｓ６０１において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信指示１７０２と１７０３を含むリクエスト１７０１を受信する。 In S601, the communication unit 207 of the transmission apparatus 101 receives the request 1701 including the PUSH transmission instructions 1702 and 1703.
　動作例１０ではセグメントのデータの種類を識別子として使用するため、送信装置１０１はＳ６０２の処理をスキップする。 In operation example 10, since the type of segment data is used as an identifier, the transmission apparatus 101 skips the processing of S602.
　Ｓ６０３において、送信装置１０１の通信部２０７はＰＵＳＨ送信指示１７０２と１７０３に対する応答をｐｕｓｈ－ｐｏｌｉｃｙヘッダーに含むレスポンス１７０４を受信装置１０２へ送信する。レスポンス１７０４はまたｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ１のバイナリデータを含んでいる。動作例１０では、レスポンス１７０４は、ＰＵＳＨ送信指示１７０２と１７０３に対する応答として、ＰＵＳＨ送信指示１７０２及び１７０３と同じ内容であるＰＵＳＨ送信指示の応答１７０５と１７０６を含んでいる。すなわち、レスポンス１７０４は二つのｐｕｓｈ－ｐｏｌｉｃｙヘッダーを持ち、これら二つのヘッダーによりＰＵＳＨ送信指示の応答１７０５と１７０６を含んでいる。なお、別々のｐｕｓｈ－ｐｏｌｉｃｙヘッダーではなく、一つのｐｕｓｈ－ｐｏｌｉｃｙヘッダーにＰＵＳＨ送信指示の応答１７０５と１７０６を含めてもよい。 In S603, the communication unit 207 of the transmission apparatus 101 transmits a response 1704 including responses to the PUSH transmission instructions 1702 and 1703 in the push-policy header to the reception apparatus 102. The response 1704 also includes binary data of video / segment A1. In the operation example 10, the response 1704 includes PUSH transmission instruction responses 1705 and 1706 having the same contents as the PUSH transmission instructions 1702 and 1703 as responses to the PUSH transmission instructions 1702 and 1703. That is, the response 1704 has two push-policy headers, and includes PUSH transmission instruction responses 1705 and 1706 by these two headers. Note that the PUSH transmission instruction responses 1705 and 1706 may be included in a single push-policy header instead of separate push-policy headers.
　レスポンス１７０４送信後、送信装置１０１は、ＨＴＴＰ／２における、ＰＵＳＨ送信予定のセグメント毎に、そのセグメントを送信するためのｓｔｒｅａｍを予約するＰＵＳＨ＿ＰＲＯＭＩＳＥ１７０７～１７１１を受信装置１０２へ送信する。受信装置１０２は、ＰＵＳＨ＿ＰＲＯＭＩＳＥ１７０７～１７１１を送信装置１０１から受信する。ＰＵＳＨ＿ＰＲＯＭＩＳＥ１７０７、１７０８、１７０９、１７１０及び１７１１は、レスポンス１７０４の前に送受信してもよい。 After transmitting the response 1704, the transmission apparatus 101 transmits PUSH_PROMISE 1707 to 1711 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102. The receiving apparatus 102 receives PUSH_PROMISE 1707 to 1711 from the transmitting apparatus 101. The PUSH_PROMISE 1707, 1708, 1709, 1710, and 1711 may be transmitted / received before the response 1704.
　動作例１０ではセグメントのデータの種類を識別子として使用するため、送信装置１０１はＳ６０４の処理をスキップする。 In the operation example 10, since the data type of the segment is used as an identifier, the transmission apparatus 101 skips the process of S604.
　Ｓ７０３において、受信装置１０２の通信部３０８は、ＰＵＳＨ送信指示１７０２に対する応答１７０５、及び、ＰＵＳＨ送信指示１７０３に対する応答１７０６を含むレスポンス１７０４を受信する。 In S703, the communication unit 308 of the reception apparatus 102 receives a response 1704 including a response 1705 to the PUSH transmission instruction 1702 and a response 1706 to the PUSH transmission instruction 1703.
　Ｓ７０４において、受信装置１０２の指示管理部３０６は、応答が返ってきて受理されたＰＵＳＨ送信指示１７０２及び１７０３を保持する。なお、動作例１０では一組のリクエストとレスポンスで複数のＰＵＳＨ送信指示のやり取りをしているが、一つのＰＵＳＨ送信指示毎にリクエストとレスポンスを交わす方法でも本実施形態のＰＵＳＨ送信キャンセル処理は実施可能である。 In S704, the instruction management unit 306 of the receiving apparatus 102 holds the PUSH transmission instructions 1702 and 1703 that have been received after receiving a response. In the operation example 10, a plurality of PUSH transmission instructions are exchanged by a set of requests and responses. However, the PUSH transmission canceling process according to the present embodiment is performed even by a method in which a request and a response are exchanged for each PUSH transmission instruction. Is possible.
　Ｓ６０５において、送信装置１０１はＰＵＳＨ送信を開始し、ａｕｄｉｏ／ｓｅｇｍｅｎｔＡ１のＰＵＳＨ送信として、送信装置１０１の通信部２０７は、ａｕｄｉｏ／ｓｅｇｍｅｎｔＡ１のバイナリデータを含むレスポンス１７１２を受信装置１０２へ送信する。 In S605, the transmission apparatus 101 starts PUSH transmission, and the communication unit 207 of the transmission apparatus 101 transmits a response 1712 including the binary data of audio / segment A1 to the reception apparatus 102 as PUSH transmission of audio / segment A1.
　Ｓ７０５において、受信装置１０２の通信部３０８はレスポンス１７１２を受信する。 In S705, the communication unit 308 of the receiving apparatus 102 receives the response 1712.
　Ｓ７０６において、受信装置１０２の通信部３０８はＰＵＳＨ送信キャンセル指示１７１５とＰＵＳＨ送信指示１７１４を含むリクエスト１７１３を送信する。本実施形態ではＰＵＳＨ送信キャンセル指示１７１５としてｐｕｓｈ－ｃａｎｃｅｌヘッダーが用いられるが、ｐｕｓｈ－ｃａｎｃｅｌとは異なる名前のヘッダーをキャンセル指示として用いても良い。動作例１０では、映像データのセグメントをＰＵＳＨ送信キャンセル対象とし、ＰＵＳＨ送信キャンセル対象を指示するためｐｕｓｈ－ｃａｎｃｅｌヘッダー１７１５の値に"ｖｉｄｅｏ"という値を指定するが、"ｖｉｄｅｏ"とは異なる値を用いても良い。また、"ａｕｄｉｏ"や"ｍｅｔａｄａｔａ"という値を指定することで音声データやメタデータのセグメントなど映像データ以外のセグメントをＰＵＳＨ送信キャンセル対象としてもよい。コーデック名や音声の言語などというようにセグメントのデータの種類を詳細に指定しても良い。"ｉｍｍｅｄｉａｔｅ"などを指定することですべてのセグメントをＰＵＳＨ送信キャンセル対象としてもよい。ＰＵＳＨキャンセル対象を指示するための値として"ｖｉｄｅｏ"などデータの種類を表す文字列の代わりに、ＡｄａｐｔａｔｉｏｎＳｅｔやＲｅｐｒｅｓｅｔａｔｉｏｎのＩＤを用いても良い。ＰＵＳＨ送信指示１７１４において、"ｕｒｎ：ｓａｍｐｌｅ：ｐｕｓｈ－ｎｅｘｔ"に続く数字"１"は、"／ｅｘａｍｐｌｅ／ｖｉｄｅｏ／ｓｅｇｍｅｎｔＢ２"に続いて取得するセグメントの個数を指定している。したがって、受信装置１０２は、ＰＵＳＨ送信指示１７１４によってｖｉｄｅｏ／ｓｅｇｍｅｎｔＢ３のＰＵＳＨ送信を要求している。 In S706, the communication unit 308 of the reception apparatus 102 transmits a request 1713 including a PUSH transmission cancel instruction 1715 and a PUSH transmission instruction 1714. In this embodiment, a push-cancel header is used as the PUSH transmission cancel instruction 1715, but a header having a name different from the push-cancel may be used as the cancel instruction. In the operation example 10, a segment of video data is set as a PUSH transmission cancel target, and a value of “video” is specified as a value of the push-cancel header 1715 to indicate the PUSH transmission cancel target, but a value different from “video” is specified. It may be used. Also, segments other than video data such as audio data and metadata segments may be subject to PUSH transmission cancellation by specifying values such as “audio” and “metadata”. The data type of the segment may be specified in detail, such as a codec name or audio language. By designating “immediate” or the like, all segments may be subject to PUSH transmission cancellation. Instead of a character string indicating the type of data such as “video”, an ID of AdaptationSet or Resetting may be used as a value for instructing a PUSH cancellation target. In the PUSH transmission instruction 1714, the number “1” following “urn: sample: push-next” designates the number of segments to be acquired following “/ example / video / segmentB2”. Therefore, the receiving apparatus 102 requests the PUSH transmission of video / segment B3 by the PUSH transmission instruction 1714.
　Ｓ６０６において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１７１５とＰＵＳＨ送信指示１７１４を含むリクエスト１７１３を受信装置１０２から受信する。キャンセル指示１７１５を含むリクエスト１７１３を送信した受信装置と、キャンセル指示１７１５に含まれているデータの種類（本例では、ｖｉｄｅｏ）からキャンセル対象のプッシュ送信指示１７０２が特定される。 In S606, the communication unit 207 of the transmission apparatus 101 receives the request 1713 including the PUSH transmission cancel instruction 1715 and the PUSH transmission instruction 1714 from the reception apparatus 102. The push transmission instruction 1702 to be canceled is specified from the receiving apparatus that has transmitted the request 1713 including the cancellation instruction 1715 and the type of data included in the cancellation instruction 1715 (video in this example).
　Ｓ６０７において、送信装置１０１の指示管理部２０６はＰＵＳＨ送信キャンセル指示１７１５の値から、ＰＵＳＨ送信指示１７０２によるＰＵＳＨ予定のセグメントで、その中の一つのセグメントをキャンセル候補セグメントとして特定する。この例では、ＰＵＳＨ送信指示１１０３によるＰＵＳＨ予定のセグメントはｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２、ｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３であるから、その中の一つであるｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２がキャンセル候補セグメントとして特定される。 In S607, the instruction management unit 206 of the transmission device 101 identifies one of the segments scheduled to be pushed by the PUSH transmission instruction 1702 as a cancel candidate segment from the value of the PUSH transmission cancellation instruction 1715. In this example, the PUSH-scheduled segments according to the PUSH transmission instruction 1103 are video / segment A2 and video / segment A3, so that one of them, video / segment A2, is specified as a cancel candidate segment.
　Ｓ６０８において、キャンセル候補セグメントであるｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２は、ＰＵＳＨ送信指示１７０２以外で送信装置１０１が採用しているＰＵＳＨ送信指示１７０３によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, video / segment A2, which is a cancel candidate segment, is determined not to be a PUSH transmission target according to the PUSH transmission instruction 1703 employed by the transmission apparatus 101 other than the PUSH transmission instruction 1702 (NO in S608), and the process proceeds to S609. Transition.
　Ｓ６０９において、送信装置１０１の指示管理部２０６は、セグメント決定部２０５へｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１７０８による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１７１９の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the video / segment A2 PUSH transmission, and the segment determination unit 205 cancels the video / segment A2 PUSH transmission. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1708 has already been completed, transmission of RST_STREAM 1719 for canceling transmission reservation and processing of stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１７１５によるＰＵＳＨ送信指示１７０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行っていないと判定する（Ｓ６１０でＮＯ）。ＰＵＳＨ予定のセグメントの中で、ｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３について処理を行っていないためである。そこで、Ｓ６０７へ遷移する。 In S610, it is determined that the cancellation is not confirmed and the cancel process is not performed for all the cancel candidate segments of the PUSH transmission instruction 1702 by the PUSH transmission cancellation instruction 1715 (NO in S610). This is because the video / segment A3 is not processed in the PUSH scheduled segment. Therefore, the process proceeds to S607.
　Ｓ６０７において、送信装置１０１の指示管理部２０６はＰＵＳＨ送信キャンセル指示１７１５の値から、ＰＵＳＨ送信指示１７０２によるＰＵＳＨ予定のセグメントで、その中の一つであるｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３をキャンセル候補セグメントと特定する。 In S <b> 607, the instruction management unit 206 of the transmission apparatus 101 identifies video / segment A <b> 3, which is one of the PUSH scheduled segments according to the PUSH transmission instruction 1702, as a cancel candidate segment from the value of the PUSH transmission cancellation instruction 1715.
　Ｓ６０８において、キャンセル候補セグメントであるｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３が、ＰＵＳＨ送信指示１７０２以外で送信装置１０１が採用しているＰＵＳＨ送信指示１７０３によるＰＵＳＨ送信対象になっていないと判定し（Ｓ６０８でＮＯ）、Ｓ６０９へ遷移する。 In S608, it is determined that video / segment A3, which is a cancel candidate segment, is not a PUSH transmission target according to the PUSH transmission instruction 1703 adopted by the transmission apparatus 101 other than the PUSH transmission instruction 1702 (NO in S608), and proceeds to S609. Transition.
　Ｓ６０９において、送信装置１０１の指示管理部２０６はセグメント決定部２０５へｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルするよう指示を出し、セグメント決定部２０５はｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３のＰＵＳＨ送信をキャンセルする。具体的なキャンセル処理として、既にＰＵＳＨ＿ＰＲＯＭＩＳＥ１７１０による送信予約済みであるため、送信予約をキャンセルするためのＲＳＴ＿ＳＴＲＥＡＭ１７２１の送信と、送信装置１０１内部でＰＵＳＨ送信を停止する処理を行う。 In S609, the instruction management unit 206 of the transmission apparatus 101 instructs the segment determination unit 205 to cancel the video / segment A3 PUSH transmission, and the segment determination unit 205 cancels the video / segment A3 PUSH transmission. As specific cancellation processing, since transmission reservation by the PUSH_PROMISE 1710 has already been completed, transmission of RST_STREAM 1721 for canceling transmission reservation and processing for stopping PUSH transmission inside the transmission apparatus 101 are performed.
　Ｓ６１０において、ＰＵＳＨ送信キャンセル指示１７１５によるＰＵＳＨ送信指示１７０２のキャンセル候補セグメント全てに対し、キャンセル可能かの確認及びキャンセル処理を行ったと判定し（Ｓ６１０でＹＥＳ）、Ｓ６１１へ遷移する。 In S610, it is determined that cancellation is possible for all the cancel candidate segments of the PUSH transmission instruction 1702 by the PUSH transmission cancellation instruction 1715 and cancellation processing is performed (YES in S610), and the process proceeds to S611.
　Ｓ６１１において、キャンセル対象であるＰＵＳＨ送信指示は１７０２のみであるため（Ｓ６１１でＹＥＳ）、Ｓ６１２へ遷移する。 In S611, since the PUSH transmission instruction to be canceled is only 1702 (YES in S611), the process proceeds to S612.
　Ｓ６１２において、送信装置１０１の通信部２０７は、ＰＵＳＨ送信キャンセル指示１７１５に対する応答１７１８とＰＵＳＨ送信指示１７１４に対する応答１７１７を含むレスポンス１７１６を受信装置１０２へ送信する。ＰＵＳＨ送信キャンセル指示１７１５に対する応答１７１８はｐｕｓｈ－ｃａｎｃｅｌヘッダーを用い、ＰＵＳＨ送信キャンセル指示１７１５と同じ内容を有する。なお、別のヘッダーが用いられても良い。レスポンス１７１７はまたｖｉｄｅｏ／ｓｅｇｍｅｎｔＢ２のバイナリデータを含んでいる。 In S612, the communication unit 207 of the transmission apparatus 101 transmits a response 1716 including a response 1718 to the PUSH transmission cancel instruction 1715 and a response 1717 to the PUSH transmission instruction 1714 to the reception apparatus 102. A response 1718 to the PUSH transmission cancel instruction 1715 uses the push-cancel header and has the same content as the PUSH transmission cancel instruction 1715. Another header may be used. Response 1717 also includes binary data of video / segment B2.
　Ｓ７０７において、受信装置１０２の通信部３０８はＰＵＳＨ送信キャンセル指示１７１５に対する応答１７１８とＰＵＳＨ送信指示１７１４に対する応答１７１７を含むレスポンス１７１６を受信する。 In S707, the communication unit 308 of the reception apparatus 102 receives a response 1716 including a response 1718 to the PUSH transmission cancel instruction 1715 and a response 1717 to the PUSH transmission instruction 1714.
　レスポンス１７１６の送信後、送信装置１０１は、ＨＴＴＰ／２における、ＰＵＳＨ送信予定のセグメント毎に、そのセグメントを送信するためのｓｔｒｅａｍを予約するＰＵＳＨ＿ＰＲＯＭＩＳＥ１７１９を受信装置１０２へ送信する。受信装置１０２は、ＰＵＳＨ＿ＰＲＯＭＩＳＥ１７１９を送信装置１０１から受信する。 After transmitting the response 1716, the transmission apparatus 101 transmits PUSH_PROMISE 1719 for reserving a stream for transmitting the segment for each segment scheduled to be transmitted in HTTP / 2 to the reception apparatus 102. The receiving apparatus 102 receives PUSH_PROMISE 1719 from the transmitting apparatus 101.
　キャンセルされたｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ２及びｖｉｄｅｏ／ｓｅｇｍｅｎｔＡ３に対して、送信装置１０１は受信装置１０２へＰＵＳＨ＿ＰＲＯＭＩＳＥ１７０８及び１７１０を送信しているため、これらをキャンセルする必要がある。そこで、送信装置１０１は受信装置１０２へＲＳＴ＿ＳＴＲＥＡＭ１７２０及び１７２１を送信し、受信装置１０２はこれを受信する。このＲＳＴ＿ＳＴＲＥＡＭ１７２０及び１７２１はＳ７０６の前かＳ７０７の後に受信装置１０２が送信してもよい。 Since the transmitting apparatus 101 transmits PUSH_PROMISE 1708 and 1710 to the receiving apparatus 102 for the canceled video / segment A2 and video / segment A3, it is necessary to cancel them. Therefore, the transmission apparatus 101 transmits RST_STREAM 1720 and 1721 to the reception apparatus 102, and the reception apparatus 102 receives them. The RST_STREAM 1720 and 1721 may be transmitted by the receiving apparatus 102 before S706 or after S707.
　動作例１０では、ＰＵＳＨ送信キャンセル指示１７１５とＰＵＳＨ送信指示１７１４を合わせて行う場合の例を説明した。ＰＵＳＨ送信キャンセル指示１７１５とＰＵＳＨ送信指示１７１４を同じリクエストで送信可能としたことで、ＰＵＳＨ送信指示の再設定を余分なトランザクションを必要とせずに行うことが出来る。またセグメントのデータの種類を指定可能としたことで、特定の種類のセグメントのみのＰＵＳＨ送信キャンセルおよびＰＵＳＨ送信再設定を容易に行うことが出来る。例として、映像セグメントと音声セグメントをＰＵＳＨ対象としている中で、音声セグメントをキャンセルせずに映像セグメントのみをＰＵＳＨ送信キャンセルし、異なる解像度の映像セグメントのＰＵＳＨ送信再設定をすることなどが可能となる。 In the operation example 10, the example in which the PUSH transmission cancel instruction 1715 and the PUSH transmission instruction 1714 are performed together has been described. Since the PUSH transmission cancellation instruction 1715 and the PUSH transmission instruction 1714 can be transmitted by the same request, the PUSH transmission instruction can be reset without requiring an extra transaction. Also, by making it possible to specify the data type of the segment, it is possible to easily cancel PUSH transmission and reset PUSH transmission only for a specific type of segment. As an example, it is possible to cancel the PUSH transmission of only the video segment without canceling the audio segment and reset the PUSH transmission of the video segment having a different resolution while the video segment and the audio segment are targeted for the push. .
　以上のように、本実施形態によれば、送信装置１０１と受信装置１０２の間において、少ないトランザクション回数でＰＵＳＨ送信のキャンセルを行うことができる。また複数のＰＵＳＨ送信指示を行った際に一部のＰＵＳＨ送信指示のみのキャンセルを行う場合や、ＰＵＳＨ送信予定のセグメントの一部のみをキャンセルする場合、受信装置１０２は一つのリクエスト送信でキャンセルを行うことができる。また、ＨＴＴＰ／２上でＭＰＥＧ－ＤＡＳＨの送受信を行い受信装置１０２がＰＵＳＨ送信のキャンセルを指示する際、ＰＵＳＨ＿ＰＲＯＭＩＳＥにより送信予約をしていないセグメントを個別にキャンセルする必要がない。したがって、ネットワーク上の帯域を節約することができる。 As described above, according to the present embodiment, PUSH transmission can be canceled with a small number of transactions between the transmission apparatus 101 and the reception apparatus 102. Also, when canceling only a part of PUSH transmission instructions when performing a plurality of PUSH transmission instructions, or when canceling only a part of a segment scheduled for PUSH transmission, the receiving apparatus 102 cancels with one request transmission. It can be carried out. Further, when MPEG-DASH is transmitted / received on HTTP / 2 and the receiving apparatus 102 instructs to cancel PUSH transmission, it is not necessary to individually cancel segments not reserved for transmission by PUSH_PROMISE. Therefore, the bandwidth on the network can be saved.
　＜その他の実施形態＞
　本発明は、上述の実施形態の１以上の機能を実現するプログラムを、ネットワーク又は記憶媒体を介してシステム又は装置に供給し、そのシステム又は装置のコンピュータにおける１つ以上のプロセッサーがプログラムを読出し実行する処理でも実現可能である。また、１以上の機能を実現する回路（例えば、ＡＳＩＣ）によっても実現可能である。 <Other embodiments>
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
　本発明は上記実施の形態に制限されるものではなく、本発明の精神及び範囲から離脱することなく、様々な変更及び変形が可能である。従って、本発明の範囲を公にするために、以下の請求項を添付する。 The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.
　本願は、２０１６年９月７日提出の日本国特許出願特願２０１６－１７４９６７および２０１７年３月２８日提出の日本国特許出願特願２０１７－０６３７５０を基礎として優先権を主張するものであり、その記載内容の全てを、ここに援用する。 This application claims priority based on Japanese Patent Application No. 2016-174967 filed on September 7, 2016 and Japanese Patent Application No. 2017-063750 filed on March 28, 2017. The entire contents of the description are incorporated herein.

Claims (19)

  1. 　サーバ装置であって、
    　コンテンツデータが分割されたメディアセグメントに関するプッシュ送信指示をクライアント装置から受信する受信手段と、
    　前記受信手段により受信されたプッシュ送信指示に応じたメディアセグメントを前記クライアント装置に対してプッシュ送信する送信手段と、
    　前記受信手段により受信されたプッシュ送信指示に応じたメディアセグメントのうち、前記送信手段によるプッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するために用いられる識別情報を含むプッシュキャンセル指示を前記クライアント装置から受信した場合、前記識別情報に基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする制御手段と、を有するサーバ装置。     A server device,
    Receiving means for receiving, from the client device, a push transmission instruction regarding the media segment into which the content data is divided;
    A transmission unit that push-transmits a media segment corresponding to the push transmission instruction received by the reception unit to the client device;
    Among the media segments according to the push transmission instruction received by the receiving means, the push cancel instruction including identification information used for the server device to identify a media segment whose push transmission by the transmitting means is canceled And a control unit that cancels push transmission by the transmission unit of the media segment specified based on the identification information when received from the client device.
  2. 　前記識別情報にはＵＲＬが含まれ、
    　前記制御手段は、前記ＵＲＬに基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする請求項１に記載のサーバ装置。     The identification information includes a URL,
    The server device according to claim 1, wherein the control unit cancels push transmission by the transmission unit of the media segment specified based on the URL.
  3. 　前記受信手段が受信する前記プッシュキャンセル指示は、前記クライアント装置において実行されるウェブブラウザからのメッセージのヘッダに含まれる請求項１または２に記載のサーバ装置。 3. The server device according to claim 1, wherein the push cancel instruction received by the receiving unit is included in a header of a message from a web browser executed in the client device.
  4. 　前記識別情報には、前記プッシュ送信指示を識別するための識別子が含まれ、
    　前記制御手段は、前記識別子に基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする請求項１乃至３のいずれか１項に記載のサーバ装置。     The identification information includes an identifier for identifying the push transmission instruction,
    The server device according to any one of claims 1 to 3, wherein the control unit cancels push transmission of the media segment specified based on the identifier by the transmission unit.
  5. 　前記識別子は、前記クライアント装置により割り当てられ、前記受信手段が受信するプッシュ送信指示に記述される請求項４に記載のサーバ装置。 The server device according to claim 4, wherein the identifier is assigned by the client device and described in a push transmission instruction received by the receiving unit.
  6. 　前記受信手段によるプッシュ送信指示の受信に応じて、当該プッシュ送信指示に対して識別子を割り当てる割当手段を有し、
    　前記送信手段は、前記割当手段により割り当てられた識別子を前記クライアント装置に対して通知する請求項４に記載のサーバ装置。     Allocating means for assigning an identifier to the push transmission instruction in response to reception of the push transmission instruction by the receiving means;
    The server device according to claim 4, wherein the transmission unit notifies the client device of the identifier allocated by the allocation unit.
  7. 　前記識別情報には、前記プッシュ送信指示に関する時刻情報が含まれ、
    　前記制御手段は、前記時刻情報に基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする請求項１に記載のサーバ装置。     The identification information includes time information related to the push transmission instruction,
    The server apparatus according to claim 1, wherein the control unit cancels push transmission by the transmission unit of a media segment specified based on the time information.
  8. 　前記時刻情報は、前記クライアント装置による前記プッシュ送信指示の送信時刻に関する時刻情報である請求項７に記載のサーバ装置。 The server device according to claim 7, wherein the time information is time information related to a transmission time of the push transmission instruction by the client device.
  9. 　前記時刻情報は、前記クライアント装置からの前記プッシュ送信指示に対するレスポンスの送信時刻に関する時刻情報である請求項７に記載のサーバ装置。 The server device according to claim 7, wherein the time information is time information related to a transmission time of a response to the push transmission instruction from the client device.
  10. 　前記識別情報には、メディアデータのタイプ情報が含まれ、
    　前記制御手段は、前記タイプ情報に基づいて特定されるメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする請求項１に記載のサーバ装置。     The identification information includes media data type information,
    The server apparatus according to claim 1, wherein the control unit cancels push transmission by the transmission unit of a media segment specified based on the type information.
  11. 　前記タイプ情報は、映像データであるかオーディオデータであるかその他のデータであるかを少なくとも判別するための情報である請求項１０に記載のサーバ装置。 The server device according to claim 10, wherein the type information is information for determining at least whether the data is video data, audio data, or other data.
  12. 　すべてのプッシュ送信をキャンセルすることを指定する情報が含まれるプッシュキャンセル指示を前記クライアント装置から受信した場合、前記制御手段は、前記送信手段によるメディアセグメントに関するすべてのプッシュ送信をキャンセルする請求項１に記載のサーバ装置。 The control unit cancels all push transmissions related to a media segment by the transmission unit when receiving a push cancel instruction including information designating cancellation of all push transmissions from the client device. The server apparatus of description.
  13. 　前記制御手段は、
    　前記プッシュキャンセル指示により指定されるプッシュ送信指示に対応する１又は複数のメディアセグメントのうち、前記受信手段により受信された他のプッシュ送信指示に対応するメディアセグメントのプッシュ送信をキャンセルせず、
    　前記プッシュキャンセル指示により指定されるプッシュ送信指示に対応する前記１又は複数のメディアセグメントのうち、前記他のプッシュ送信指示に対応しないメディアセグメントのプッシュ送信をキャンセルする請求項１に記載のサーバ装置。     The control means includes
    Of one or more media segments corresponding to the push transmission instruction specified by the push cancel instruction, without canceling the push transmission of the media segment corresponding to the other push transmission instruction received by the receiving means,
    The server apparatus according to claim 1, wherein among the one or more media segments corresponding to the push transmission instruction specified by the push cancel instruction, push transmission of a media segment not corresponding to the other push transmission instruction is canceled.
  14. 　複数のプッシュ送信指示を指定するプッシュキャンセル指示を前記クライアント装置から受信した場合、前記制御手段は、前記複数のプッシュ送信指示に応じた複数のメディアセグメントの前記送信手段によるプッシュ送信をキャンセルする請求項１に記載のサーバ装置。 The control unit cancels push transmission by the transmission unit of a plurality of media segments according to the plurality of push transmission instructions when receiving a push cancel instruction designating a plurality of push transmission instructions from the client device. The server device according to 1.
  15. 　前記識別情報は、ＭＰＤ（Ｍｅｄｉａ　Ｐｒｅｓｅｎｔａｔｉｏｎ　Ｄｅｓｃｒｉｐｔｉｏｎ）に記述されることを特徴とする請求項１に記載のサーバ装置。 2. The server apparatus according to claim 1, wherein the identification information is described in MPD (Media Presentation Description).
  16. 　クライアント装置であって、
    　コンテンツデータが分割されたメディアセグメントに関するプッシュ送信指示をサーバ装置へ送信する送信手段と、
    　前記送信手段により送信されたプッシュ送信指示に応じて前記サーバ装置からプッシュ送信されたメディアセグメントを受信する受信手段と、
    　前記送信手段により前記サーバ装置へ送信されたプッシュ送信指示に応じたメディアセグメントのうち、前記サーバ装置によるプッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するために用いられる識別情報を含むプッシュキャンセル指示を前記サーバ装置へ送信することで、前記識別情報に応じたメディアセグメントの前記サーバ装置によるプッシュ送信をキャンセルする制御手段と、を有するクライアント装置。     A client device,
    Transmitting means for transmitting to the server device a push transmission instruction related to the media segment into which the content data is divided;
    Receiving means for receiving a media segment pushed from the server device in response to a push transmission instruction sent by the sending means;
    A push including identification information used for the server device to identify a media segment in which push transmission by the server device is canceled among media segments according to the push transmission instruction transmitted to the server device by the transmitting unit. And a control unit that cancels push transmission of the media segment according to the identification information by the server device by transmitting a cancel instruction to the server device.
  17. 　サーバ装置の制御方法であって、
    　コンテンツデータが分割されたメディアセグメントに関するプッシュ送信指示をクライアント装置から受信し、
    　前記クライアント装置から受信したプッシュ送信指示に応じたメディアセグメントのうち、プッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するために用いられる識別情報を含むプッシュキャンセル指示を前記クライアント装置から受信しない場合、前記クライアント装置から受信したプッシュ送信指示に応じたメディアセグメントを前記クライアント装置に対してプッシュ送信し、
    　前記クライアント装置から受信したプッシュ送信指示に応じたメディアセグメントのうち、プッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するための識別情報を含むプッシュキャンセル指示を前記クライアント装置から受信した場合、前記識別情報に基づいて特定される未送信のメディアセグメントをプッシュ送信しない制御方法。     A server device control method comprising:
    A push transmission instruction regarding the media segment into which the content data is divided is received from the client device,
    Of the media segments according to the push transmission instruction received from the client apparatus, the server apparatus does not receive a push cancel instruction including identification information used for specifying a media segment for which push transmission is canceled. A media segment corresponding to the push transmission instruction received from the client device is pushed to the client device,
    Of the media segments according to the push transmission instruction received from the client device, when receiving a push cancel instruction including identification information for the server device to identify a media segment for which push transmission is canceled, from the client device, A control method that does not push-transmit an unsent media segment specified based on the identification information.
  18. 　クライアント装置の制御方法であって、
    　コンテンツデータが分割されたメディアセグメントに関するプッシュ送信指示をサーバ装置へ送信し、
    　前記サーバ装置へ送信されたプッシュ送信指示に応じたメディアセグメントのうち、前記サーバ装置によるプッシュ送信がキャンセルされるメディアセグメントを前記サーバ装置が特定するために用いられる識別情報を含むプッシュキャンセル指示を前記サーバ装置へ送信することで、前記識別情報に応じたメディアセグメントの前記サーバ装置によるプッシュ送信をキャンセルする制御方法。     A method for controlling a client device, comprising:
    A push transmission instruction regarding the media segment into which the content data is divided is transmitted to the server device,
    Among the media segments according to the push transmission instruction transmitted to the server device, the push cancel instruction including identification information used for the server device to identify a media segment for which push transmission by the server device is cancelled. A control method for canceling push transmission by the server device of a media segment according to the identification information by transmitting to the server device.
  19. 　コンピュータを請求項１乃至１５のうち何れか１項に記載のサーバ装置の各手段として動作させるためのプログラム。 A program for causing a computer to operate as each unit of the server device according to any one of claims 1 to 15.
PCT/JP2017/027452 2016-09-07 2017-07-28 Information processing device, control method therefor, and computer program WO2018047512A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015004276A2 (en) * 2013-07-12 2015-01-15 Canon Kabushiki Kaisha Adaptive data streaming method with push messages control
WO2015121342A1 (en) * 2014-02-13 2015-08-20 Koninklijke Kpn N.V. Requesting multiple chunks from a network node on the basis of a single request message
JP2016015534A (en) * 2014-06-30 2016-01-28 ソニー株式会社 Information processor and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015004276A2 (en) * 2013-07-12 2015-01-15 Canon Kabushiki Kaisha Adaptive data streaming method with push messages control
WO2015121342A1 (en) * 2014-02-13 2015-08-20 Koninklijke Kpn N.V. Requesting multiple chunks from a network node on the basis of a single request message
JP2016015534A (en) * 2014-06-30 2016-01-28 ソニー株式会社 Information processor and method

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