WO2012011473A1 - Dispositif d'émission, procédé d'émission, dispositif de réception, procédé de réception, système de communication, structure de données, programme et support de stockage - Google Patents

Dispositif d'émission, procédé d'émission, dispositif de réception, procédé de réception, système de communication, structure de données, programme et support de stockage Download PDF

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Publication number
WO2012011473A1
WO2012011473A1 PCT/JP2011/066378 JP2011066378W WO2012011473A1 WO 2012011473 A1 WO2012011473 A1 WO 2012011473A1 JP 2011066378 W JP2011066378 W JP 2011066378W WO 2012011473 A1 WO2012011473 A1 WO 2012011473A1
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WIPO (PCT)
Prior art keywords
partial data
data
unit
transmission
partial
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PCT/JP2011/066378
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English (en)
Japanese (ja)
Inventor
伊藤　典男
高橋　真毅
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シャープ株式会社
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Priority to JP2012525401A priority Critical patent/JPWO2012011473A1/ja
Publication of WO2012011473A1 publication Critical patent/WO2012011473A1/fr

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    • 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
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2665—Gathering content from different sources, e.g. Internet and satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • 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
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
    • H04N21/26258—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists for generating a list of items to be played back in a given order, e.g. playlist, or scheduling item distribution according to such list
    • 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]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments

Definitions

  • the present invention relates to a transmission apparatus and a transmission method for transmitting content data.
  • the present invention also relates to a receiving device that receives content data transmitted from such a transmitting device, and a communication system that includes such a transmitting device and a receiving device.
  • a user can obtain text data, still image data, and the like of a WEB page by accessing the WEB page with a browser.
  • the text data and still image data can be obtained using the http (s) protocol. To be transmitted.
  • RTP Real-time Transport Protocol
  • video distribution using http content data to be distributed is often divided and stored in multiple storages.
  • video distribution from the video server to the video playback device is performed, for example, as shown in FIG.
  • the video server 2 determines that each of a plurality of partial data constituting the content data is included. Acquisition of the plurality of partial data is started from the plurality of stored storages 3a to 3b (S31, S32).
  • the content data is composed of two partial data, the first partial data (hereinafter referred to as partial data a) is stored in the storage 3a, and the second partial data (hereinafter referred to as “partial data a”).
  • partial data a the first partial data
  • partial data a the second partial data
  • the video server 2 stores the acquired plurality of partial data. Rearrangement is performed in the order of reproduction (S35), and the plurality of rearranged partial data content data are transmitted to the video reproduction apparatus 1 (S36).
  • the video server 2 acquires the partial data a at the timing when the acquisition of all the partial data is completed, that is, in S37. Is completed, the obtained plurality of partial data is rearranged in the order of reproduction (S38), and the rearranged partial data is transmitted to the video reproduction apparatus 1 (S39). In this case, the video reproduction device 1 reproduces the video with a delay of delay 2 compared to the case where no delay has occurred (S40).
  • the video server 2 After the video server 2 acquires all of the plurality of partial data, the video server 2 has a memory for storing all the partial data in order to perform a process of rearranging the plurality of partial data in the order of reproduction. Necessary.
  • the transmission device described in Patent Document 3 described above is divided image data obtained by further dividing individual unit image data by using one frame or a plurality of frames of moving image data divided into frames for throughput improvement.
  • the image data is transmitted to the receiving device through a plurality of TCP connections, and the receiving device performs processing for returning the divided image data received from the plurality of TCP connections to the original data.
  • the number of divisions of unit image data and the number of TCP connections are determined based on the throughput per TCP connection and the average bit rate of moving image data.
  • the present invention has been made in view of the above-described problems, and its main object is a transmission apparatus that transmits content data so that the reproduction apparatus that has received the content data can reproduce the content without delay. To implement the device.
  • each of a plurality of partial data constituting the content data is transferred to one or a plurality of partial data.
  • a partial data acquisition unit that acquires from a storage device; and the partial data acquisition unit that associates each of the plurality of partial data acquired by the partial data acquisition unit with reproduction order designation information that designates the reproduction order of the partial data.
  • the transmission method according to the present invention is a transmission method in which a transmission device transmits content data, and when a transmission of content data is requested from another device, a plurality of partial data constituting the content data is transmitted.
  • a partial data acquisition step for acquiring each from one or a plurality of storage devices, and each of the plurality of partial data acquired in the partial data acquisition step, reproduction order designation information for designating the reproduction order of the partial data;
  • the partial data constituting the content data requested by the other device is transmitted to the other device in the order obtained from the storage device, so that the partial data with the slow reproduction order is transmitted. Even in the case of the acquisition first, the partial data can be transmitted to another device without delay.
  • a receiving apparatus includes a partial data receiving unit that receives a plurality of partial data constituting content data together with reproduction order designation information associated with each of the plurality of partial data. And a partial data rearranging means for rearranging the plurality of partial data received by the partial data receiving means in a reproduction order designated by the reproduction order designation information received by the partial data receiving means. It is characterized by.
  • the receiving method is a receiving method in which a receiving apparatus receives content data, and a plurality of pieces of partial data constituting the content data are reproduced in order of designation information associated with each of the plurality of pieces of partial data.
  • a partial data receiving step received together with the partial data received in the partial data receiving step, and the partial data rearranged in the reproduction order designated by the reproduction order designation information received in the partial data receiving step A sorting step.
  • the content data transmitted from the above-described transmission device can be received without delay.
  • the present invention has an effect of realizing a transmitting apparatus that transmits content data, and that realizes a transmitting apparatus that allows the reproducing apparatus that has received the content data to reproduce the content without delay.
  • FIG. 2 is a block diagram showing a main configuration of storage in the communication system of FIG. 1. It is a figure which shows the structure of content data.
  • 3 is a flowchart showing a flow of processing of a video playback device in content playback processing according to the first embodiment.
  • 3 is a flowchart showing a flow of processing of a video server in content reproduction processing according to the first embodiment.
  • FIG. 6 is a sequence diagram illustrating an example of a flow of content reproduction processing according to Embodiment 1.
  • FIG. 6 is a diagram illustrating an example of a data flow in content reproduction processing according to Embodiment 1.
  • FIG. 10 is a sequence diagram illustrating another example of the flow of content reproduction processing according to the first embodiment. It is a figure which shows the other example of the HTTP message transmitted from a video server.
  • FIG. 10 is a diagram illustrating a configuration of content data in content reproduction processing according to the second embodiment.
  • 10 is a flowchart showing a flow of processing of a video server in content reproduction processing according to the second embodiment.
  • 10 is a diagram illustrating an example of a data flow in content reproduction processing according to Embodiment 2.
  • FIG. 10 is a diagram illustrating another example of the data flow in the content reproduction process according to the second embodiment. It is a figure which shows the example of the HTTP message transmitted from the video server of FIG.
  • FIG. 10 is a diagram illustrating a configuration of content data in content reproduction processing according to the third embodiment.
  • 10 is a flowchart showing a flow of processing of a video playback device in content playback processing according to Embodiment 3.
  • 10 is a flowchart showing a flow of processing of a video server in content reproduction processing according to the third embodiment. It is a figure which shows the other example of the HTTP message transmitted from a video server. It is a sequence diagram which shows an example of the flow of the conventional content reproduction
  • a video is exemplified as content to be reproduced
  • a video server is exemplified as a transmission device
  • a video reproduction device is exemplified as a reproduction device (another device)
  • the present invention is limited to this. It is not a thing.
  • video is merely an example of content, and the content includes all kinds of information such as moving images, still images, characters, and audio.
  • the playback device may be any device that can play back the content transmitted from the transmission device.
  • FIG. 5 is a diagram illustrating a configuration of content data to be distributed in the present embodiment.
  • FIG. 5 shows content data C including encoded data obtained by encoding video content as an example of content data to be distributed.
  • Content (video) consists of multiple frames and is encoded for each frame.
  • this encoded data is divided into one or a plurality of reproduction units (segments) U1, U2,... UM, and each reproduction unit Ui is further divided into one or a plurality of partial data (fragments) Fi1. , Fi2,..., FiN.
  • encoded data that requires one hour for reproduction is equally divided into 60 reproduction units U1, U2,..., U60, and each reproduction unit Ui that requires one minute for reproduction is further divided into 60 partial data Fi1.
  • Fi2,..., Fi60 can be equally divided and managed.
  • the time required to reproduce each partial data Fij is 1 second.
  • the division method for dividing the encoded data into reproduction units U1, U2,... UM and the division method for dividing each reproduction unit Ui into partial data Fi1, Fi2,. Is not to be done.
  • a header H corresponding to the entire encoded data is arranged at the head of the content data C and corresponds to each partial data Fij.
  • a header Hij is arranged at the beginning of the partial data, and a delimiter S indicating the end of each reproduction unit is arranged at the end of the reproduction unit.
  • the content data includes a single delimiter S indicating the end of the entire encoded data.
  • the header H corresponding to the entire encoded data is referred to as an “overall header”, and the header Hij corresponding to each partial data is referred to as a “partial header” to distinguish them.
  • each divided data Fij can be reproduced without referring to other divided data Fi′j ′.
  • encoded data encoded according to H264 / AVC it is desirable to divide the encoded data into partial data so that encoded data constituting the same GOP (Group of Picture) is not divided.
  • FIG. 1 is a diagram illustrating a configuration example of a communication system (content transmission system) 100.
  • the communication system 100 is a system for distributing content data, and includes a video playback device (another device, a receiving device) 1, a video server 2, and a plurality of storages 3. ing.
  • Content data to be distributed is divided into a plurality of partial data, and is distributed and stored in a plurality of storages 3.
  • the video playback device 1 is connected to a video server (transmission device) 2 via a network 1 (hereinafter “NW1”), and the video server 2 is connected to one or a plurality of storages (hereinafter referred to as “NW2”).
  • NW1 and NW2 may be any devices that can communicate with each other, and may be a wired communication network or a wireless communication network.
  • the video playback device 1 requests the video server 2 to transmit content data via the NW1.
  • the request for content data is made for each reproduction unit (specific part) described above.
  • the video server 2 acquires each piece of partial data constituting the requested reproduction unit from the plurality of storages 3 via the NW 2 and transmits the partial data to the video reproduction device 1 in the order in which the acquisition is completed.
  • the video reproduction device 1 receives these partial data, rearranges them, and decodes / reproduces them.
  • a storage server connected to the video server 2 via the NW 2 is assumed as a storage device for storing partial data.
  • the present invention is not limited to this.
  • a configuration in which partial data is stored in a recording device such as an HDD (Hard Disk Drive Device) built in the video server 2 may be adopted.
  • the network (NW2) is interposed between the storage device (storage 3) for storing the partial data and the video server 2, and the delay of reading of the partial data from the storage device is likely to occur, the effect of the present invention. It goes without saying that it appears prominently.
  • FIG. 2 is a block diagram showing a main configuration of the video playback apparatus 1.
  • the video reproduction apparatus 1 includes a request generation unit 11, a transmission unit 12, a control unit 13, a decoding unit 14, a buffer 15, a rearrangement processing unit (partial data rearrangement unit) 16, a reception unit (partial data reception unit) 17, and a monitoring A unit 18 and a playback unit 19 are provided.
  • the video playback device 1 further includes an input unit (not shown) that receives a user operation for designating content data to be played back.
  • the control unit 13 gives an instruction to the request generation unit 11 to generate a request message for requesting transmission of content data designated by the user operation.
  • the request generation unit 11 generates a request message for requesting transmission of content data, for example, a GET message according to the HTTP protocol, in accordance with an instruction from the control unit 13.
  • the request generator 11 supplies the generated request message to the transmitter 12.
  • This request message is a request for transmission of content data for one playback unit, and includes playback unit designation information for designating a playback unit for which transmission is requested.
  • a URI Uniform Resource Identifier
  • the URI can be used as playback unit designation information.
  • a combination of the URI and an identifier for identifying the requested reproduction unit from other reproduction units can be used as reproduction unit designation information. it can.
  • the transmission unit 12 transmits the request message generated by the request generation unit 11 to the video server 2.
  • the transmission unit 12 also functions as a means for transmitting a session disconnection notification, which will be described later, to the video server 2 in accordance with an instruction from the control unit 13.
  • the receiving unit 17 receives the content data transmitted from the video server 2 as a response to the request message.
  • the content data received by the receiving unit 17 as a response to one request message is content data for one reproduction unit. As shown in FIG. 5, one whole header, a plurality of partial data, a plurality of partial headers, and One delimiter is included.
  • the receiving unit 17 stores the received content data in the buffer 15 and supplies it to the monitoring unit 18.
  • the monitoring unit 18 identifies the occurrence timing of various events by monitoring the content data received by the receiving unit 17. Examples of the timing specified by the monitoring unit 18 include timing at which reception of content data is started, timing at which each partial data is received, and timing at which reception of each reproduction unit is completed. These timings are specified by detecting the entire header, the partial header, and the delimiter in the content data received by the receiving unit 17. When content data is transmitted / received according to the HTTP protocol, the timing at which reception of content data is started can be specified by detecting a status line starting from “HTTP / 1.1” transmitted prior to the header. Good. The monitoring unit 18 notifies the control unit 13 of these timings.
  • the monitoring unit 18 also functions as a means for determining whether or not the receiving unit 17 is in a delayed state every time it receives partial data, and notifying the control unit 13 of the timing of transition to the delayed state.
  • the determination of whether or not there is a delay state is made by comparing the time t at which each partial data is received with the decoding time (time at which decoding should be started) t ′ of the partial data (t ′ ⁇ t If it is, it is determined that the state is delayed).
  • the monitoring unit 18 determines whether or not the delay time is in reference to the decode time t ′ described in the partial header.
  • the monitoring unit 18 starts from the presentation time t ′′.
  • the rearrangement processing unit 16 refers to the partial data for one reproduction unit stored in the buffer 15 according to the instruction of the control unit 13 with reference to the partial header (reproduction order designation information) corresponding to each of these partial data. By rearranging, encoded data that can be decoded in order from the top is generated. When the rearrangement of the partial data for one playback unit is completed, the rearrangement processing unit 16 stores the generated encoded data in the buffer 15 and notifies the control unit 13 that the rearrangement is completed.
  • the decoding unit 14 decodes the content from the encoded data generated by the rearrangement processing unit 16 according to the instruction of the control unit 13.
  • the decryption unit 14 supplies the decrypted content to the playback unit 19. Further, the playback unit 19 displays the content supplied from the decryption unit 14 on a display or the like.
  • the control unit 13 controls each unit of the video playback device 1. Specifically, the following control is performed. (1) When a user operation specifying content data to be reproduced is detected, the request generation unit 11 is instructed to generate a request message for requesting the first reproduction unit of the content data. (2) Upon receiving notification from the monitoring unit 18 that reception of each playback unit has been completed, (2a) rearrangement of the partial data stored in the buffer 15 (partial data constituting the playback unit for which reception has been completed). The rearrangement processing unit 16 is instructed, and (2b) the request generation unit 11 is instructed to generate a request message for requesting the next reproduction unit of the reproduction unit that has been received.
  • FIG. 3 is a block diagram showing a main configuration of the video server 2.
  • the video server 2 includes a reception unit (partial data acquisition unit) 21, a monitoring unit 22, a response generation unit 23, a header generation unit 24, a footer generation unit 25, a transmission unit (partial data transmission unit) 26, a request generation unit 27, and
  • the management table storage unit 28 is provided.
  • the receiving unit 21 receives a request message (content data request) from the video playback device 1 that requests transmission of content data for one playback unit, and generates a request and a request for the received request message (content data request). To the unit 27. In addition, the receiving unit 21 acquires partial data constituting the playback unit requested from the video playback device 1 from the storage 3 and supplies the acquired partial data to the response generation unit 23. Further, the receiving unit 21 receives a session disconnection notification from the video playback device 1 and supplies the received session disconnection notification to the monitoring unit 22.
  • a request message content data request
  • the receiving unit 21 acquires partial data constituting the playback unit requested from the video playback device 1 from the storage 3 and supplies the acquired partial data to the response generation unit 23. Further, the receiving unit 21 receives a session disconnection notification from the video playback device 1 and supplies the received session disconnection notification to the monitoring unit 22.
  • the monitoring unit 22 monitors the received data received by the receiving unit 21, the timing at which the receiving unit 21 receives a request message (content data request) from the video playback device 1, and the receiving unit 21 receives a response (partial) from the storage 3. Data) and the timing at which the receiving unit 21 receives the session disconnection notification from the video reproduction device 1.
  • the monitoring unit 22 confirms that the request message (content data request) from the video playback device 1 has been received, the monitoring unit 22 requests the storage 3 to provide each partial data that constitutes the requested playback unit ( The request generation unit 27 is instructed to generate (partial data request). Further, every time it is confirmed that the response (partial data) from the storage 3 is acquired, the response generation unit 23 is instructed to transmit the acquired partial data.
  • the response generation unit 23 is instructed to transmit the entire header, and when the reception unit 21 has confirmed that the last partial data has been received, The response instruction generation unit 23 is instructed to transmit the symbol. Further, when the reception unit 21 confirms that the session disconnection notification has been received, the transmission unit 26 is instructed to stop transmission of partial data.
  • the management table storage unit 28 stores a management table indicating in which storage 3 each partial data constituting the reproduction unit is stored for each reproduction unit of the content data that can be distributed by the video server 2.
  • This management table includes, for example, reproduction unit designation information for designating each reproduction unit (for example, the URI of the reproduction unit) and storage designation information for designating the storage 3 in which each partial data constituting the reproduction unit is stored ( For example, it is realized by recording a list composed of the IP address or MAC address of the storage 3 in association with each other.
  • the request generator 27 generates a request message (partial data request) for requesting provision of the partial data to the storage 3 in which the partial data is stored for each partial data constituting the requested reproduction unit.
  • the storage 3 in which each partial data constituting the requested reproduction unit is stored refers to the management table stored in the management table storage unit 28, so that the request message (contents) received by the reception unit 21 is stored. It can be specified from the reproduction unit designation information included in the data request.
  • the request message (partial data request) generated by the request generation unit 27 includes an identifier for identifying the partial data to be acquired from other partial data.
  • the request generation unit 27 supplies the generated request message (partial data request) to the transmission unit 26 together with storage designation information for designating the storage 3 that is the transmission destination of the request message (partial data request). Further, the request generation unit 27 supplies the header generation unit 24 with the entire transmission device (in this case, the video server 2) that supplies partial data to the video reproduction device 1.
  • the response generation unit 23 generates a response message to the request message (content data request) from the video playback device 1 in accordance with the instruction from the monitoring unit 22. Specifically, (1) When the acquisition of the first partial data is confirmed, the header generation unit 24 generates a whole header and a partial header corresponding to the first partial data, and following those headers, The first partial data is transmitted to the transmission unit 26. Thereafter, (2) every time the acquisition of partial data is confirmed, the header generation unit 24 generates a partial header corresponding to the partial data, and the partial data is transmitted to the transmission unit 26 following the partial header. . (3) After the last partial data is transmitted to the transmission unit 26, the delimiter symbol is generated by the header generation unit 24, and the delimiter symbol is transmitted to the transmission unit 26. The whole header, partial header, partial data, and delimiter transmitted from the transmission unit 26 in this way constitute a response message to the request message (content data request) from the video reproduction device 1.
  • the header generation unit 24 generates an overall header and a partial header in accordance with an instruction from the response generation unit 23.
  • the whole header and the partial header generated by the header generation unit 24 are transmitted to the video reproduction device 1 via the transmission unit 26.
  • Each partial header includes reproduction order designation information that designates the reproduction order of the corresponding partial data, as will be described later.
  • the footer generation unit 25 creates a delimiter indicating the end of the playback unit in accordance with the instruction from the response generation unit 23.
  • the delimiter generated by the footer generation unit 25 is also transmitted to the video reproduction device 1 via the transmission unit 26.
  • the transmitting unit 26 transmits each of the plurality of request messages (partial data request) generated by the request generating unit 27 to each of the request messages.
  • the request message (partial data request) is transmitted to the storage 3 that is the transmission destination. Thereby, acquisition of each partial data is started simultaneously and in parallel. Further, the transmission unit 26 transmits the response message generated by the response generation unit 23 to the video reproduction device 1.
  • the transmission unit 26 interrupts transmission of the response message generated by the response generation unit 23, that is, transmission of partial data.
  • the video server 2 may be a reverse proxy server.
  • access to the storage 3 is restricted in response to a request message (content data request) from an unspecified number of video playback devices 1 or the video playback device 1 is prevented from being directly connected to the storage 3.
  • the security of the storage 3 can be increased.
  • FIG. 4 is a block diagram showing a main configuration of the storage 3.
  • the storage 3 includes a monitoring unit 31, a read processing unit 32, a storage medium 33, a transmission unit 34, a response generation unit 35, and a reception unit 36.
  • the receiving unit 36 receives a request message (partial data request) from the video server 2 and supplies the received request message (partial data request) to the monitoring unit 31 and the read processing unit 32.
  • the monitoring unit 31 determines whether the message supplied from the receiving unit 36 is a request message (partial data request). If the message is a request message (partial data request), the monitoring unit 31 changes the request message (partial data request).
  • the read processing unit 32 is instructed to read partial data identified by this identifier from the included identifier.
  • the read processing unit 32 reads the partial data identified by the identifier included in the request message (partial data request) from the storage medium 33 in accordance with the instruction from the monitoring unit 31.
  • the read processing unit 32 supplies the read partial data to the response generation unit 35.
  • the storage medium 33 is a memory in which partial data constituting content data is stored.
  • the response generation unit 35 supplies the partial data supplied from the read processing unit 32 to the transmission unit 34.
  • the response generation unit 35 may process the partial data into a form matching the communication protocol between the storage 3 and the video server 2 and supply the processed data to the transmission unit 34.
  • the partial data may be processed into a form that can be communicated with HTTP and supplied to the transmission unit 34.
  • the transmission unit 34 transmits the partial data supplied from the response generation unit 35 to the video server 2.
  • the configuration of the storage 3 has been described by taking the case where the storage 3 and the video server 2 are connected via the NW 2 as an example.
  • the video server 2 may be connected directly to the storage medium 33 of the storage 3. Good.
  • the monitoring unit 31, the read processing unit 32, the transmission unit 34, the response generation unit 35, and the reception unit 36 described above may be included in the video server 2.
  • FIG. 6 is a flowchart showing a processing flow of the video playback device 1 in the content playback processing of the present embodiment.
  • the process shown in FIG. 6 is a process for reproducing content data for one reproduction unit, and the video reproduction apparatus 1 reproduces the entire content data by repeating the process shown in FIG. 6 for each reproduction unit. Is realized.
  • the transmission unit 12 of the video reproduction device 1 transmits a request message generated based on a user operation to the video server 2 (step S1, hereinafter simply referred to as S1).
  • the monitoring unit 18 After sending the request message, the monitoring unit 18 waits for a response from the video server 2. That is, until the response from the video server 2 is confirmed (Yes in S2), the process of determining whether or not there is a response from the video server 2 (S2) is repeated. Note that the process of determining whether or not there is a response from the video server 2 is performed by detecting a status line starting from “HTTP / 1.1” or an entire header, for example.
  • the reception unit 17 receives (one) partial header and (one corresponding to the partial header) transmitted from the video server 2.
  • the process (S3) and the process (S4) for storing the received (one) partial header and the partial data (one corresponding to the partial header) in the buffer 15 are the reception of content data for one playback unit.
  • the process is repeated until the process is completed (YES in S5) or a delay state is reached (No in S6).
  • completion of reception of content data for one playback unit indicates completion of reception of all partial data constituting the playback unit.
  • the determination as to whether or not the reception of content data for one playback unit has been completed is performed by the monitoring unit 18 detecting the delimiter received by the receiving unit 17 as described above.
  • the monitoring unit 18 instructs the rearrangement processing unit 16 to rearrange the contents stored in the buffer 15.
  • the monitoring unit 18 compares the time t at which the partial data is received with the time t ′ at which the partial data should be decoded, as described above. Is done. If it is not in the delay state (S6: No), the reception of the partial data is continued without starting the decoding / reproduction process. If it is in the delay state (S6: Yes), the reception of the partial data is interrupted and the decoding / reproduction process is started. To start.
  • the rearrangement processing unit 16 When reception of content data for one playback unit is completed (Yes in S5) or interrupted (No in S6), the rearrangement processing unit 16 corresponds the partial data stored in the buffer 15 to each partial data. By rearranging with reference to the partial header (including reproduction order designation information), encoded data that can be decoded in order from the top is generated (S8). Thereafter, the decoding unit 14 decodes the content from the encoded data generated by the rearrangement processing unit 14, and the reproduction unit 19 displays the content decoded by the decoding unit 14 (S9).
  • FIG. 7 is a flowchart showing a processing flow of the video server 2 in the content reproduction processing of the present embodiment. Note that the process shown in FIG. 7 is a process for transmitting content data for one playback unit, and the video server 2 transmits the entire content data by repeating the process shown in FIG. 7 for each playback unit. Realize.
  • the monitoring unit 22 of the video server 2 waits for a request message (content data request) from the video playback device 1. That is, the process (S10) for determining whether or not there is a request from the video reproduction device 1 is repeated until a request message from the video reproduction device 1 is confirmed. Note that the process of confirming the presence / absence of a request message from the video reproduction device 1 is performed, for example, by detecting a request line starting from “GET” in the received data received by the receiving unit 21.
  • the monitoring unit 22 Upon confirming the request message (content data request) from the video playback device 1 (Yes in S10), the monitoring unit 22 instructs the request generation unit 27 to generate a request message (partial data request).
  • the request generation unit 27 refers to the management table stored in the management table storage unit 28, and stores a plurality of partial data constituting the content data for one playback unit requested from the video playback device 1. The storage 3 in which each is stored is specified (S11). Then, the request generation unit 27 requests the storage 3 in which the partial data is provided for each of the plurality of partial data constituting the playback unit requested from the video playback device 1. Request message (partial data request) to be generated.
  • the transmission unit 26 performs processing (S12) of transmitting each request message (partial data request) generated by the request generation unit 27, and transmits all the request messages (partial data request) generated by the request generation unit 27. Repeat until completion (Yes in S13).
  • processing S12
  • the transmission unit 26 performs processing (S12) of transmitting each request message (partial data request) generated by the request generation unit 27, and transmits all the request messages (partial data request) generated by the request generation unit 27. Repeat until completion (Yes in S13).
  • S12 processing
  • the transmission unit 26 performs processing (S12) of transmitting each request message (partial data request) generated by the request generation unit 27, and transmits all the request messages (partial data request) generated by the request generation unit 27. Repeat until completion (Yes in S13).
  • the monitoring unit 22 receives the request message (partial data request) transmitted in S12 from the storage 3. Wait for the first response. That is, until the receiving unit 21 receives the first response from the storage 3, the process of determining whether or not the receiving unit 21 has received the response from the storage 3 (S14) is repeated.
  • the monitoring unit 22 instructs the response generation unit 23 to transmit the entire header.
  • the response generation unit 23 instructs the header generation unit 24 to generate the entire header and also instructs the transmission unit 26 to transmit the entire header.
  • the transmission unit 26 transmits the entire header generated by the header generation unit to the video reproduction device 1 (S15).
  • the monitoring unit 22 instructs the response generation unit 23 to transmit the first acquired partial data.
  • the response generation unit 23 instructs the header generation unit 24 to generate a partial header corresponding to the first acquired partial data, and also instructs the transmission unit 26 to transmit the first acquired partial data.
  • the transmitting unit 26 transmits the first acquired partial data to the video reproduction device 1 together with the partial header generated by the header generating unit 24 (first time S16).
  • the monitoring unit 22 instructs the response generating unit 23 to transmit the acquired partial data.
  • the response generation unit 23 instructs the header generation unit 24 to generate a partial header corresponding to the acquired partial data, and also instructs the transmission unit 26 to transmit the acquired partial data.
  • the transmission unit 26 transmits the partial data acquired by the reception unit 21 to the video reproduction device 1 together with the partial header generated by the header generation unit 24 (second and subsequent S16).
  • the transmission process (S16) of the partial data by the transmission unit 26 is repeated until all the partial data constituting the reproduction unit is obtained from the storage 3 (Yes in S17). As a result, all the partial data constituting the content data for one playback unit can be transmitted to the video playback device 1 in the order obtained from the storage 3.
  • the monitoring unit 22 instructs the response generation unit 23 to transmit a delimiter.
  • the response generation unit 23 instructs the footer generation unit 25 to generate a delimiter, and also instructs the transmission unit 26 to transmit the delimiter generated by the footer generation unit 25.
  • the transmission unit 26 transmits the delimiter generated by the footer generation unit 25 to the video reproduction device 1 (S19).
  • FIG. 10 is a sequence diagram illustrating an operation example of the communication system 100.
  • the operation example in FIG. 10 is an example in which the video server 2 can acquire all the partial data constituting the content data for one playback unit without delay.
  • the reproduction unit is composed of two partial data, the first partial data (hereinafter referred to as partial data a) is stored in the storage 3a, and the second partial data (hereinafter referred to as partial data a). , Described as partial data b) is stored in the storage 3b as an example. Also, the processing performed by the video playback device 1 and the processing performed by the video server 2 are the same as those in FIGS. 6 and 7, respectively, and therefore are given the same numbers and are not described here.
  • the video playback device 1 requests the video server 2 to transmit content data for one playback unit (S101).
  • the video server 2 requests the storage 3a and the storage 3b to provide the partial data a and the partial data b constituting the requested reproduction unit (S102, S103).
  • the video server 2 When the video server 2 completes the acquisition of the partial data b from the storage 3b (S104), the video server 2 transmits the entire header to the video playback device (S105). Further, the acquired partial data b is transmitted to the video reproduction apparatus 1 together with the partial header (2 ') corresponding to the partial data b (S106).
  • the video server 2 transmits the remaining partial data a to the video reproduction device 1 together with the partial header (1 ′) corresponding to the partial data a when the acquisition from the storage 3a (S107) is completed (S108). ).
  • the video server 2 finishes transmitting all the partial data constituting the content data for one playback unit to the video playback device 1, the video server 2 transmits a delimiter indicating the end of the playback unit to the video playback device 1 (S109).
  • the video playback device 1 rearranges (S8), decodes, and plays back the partial data ab received so far (S9).
  • the video server 2 transmits the partial data constituting each playback unit to the video playback device 1 in order from the acquisition of the partial data.
  • the video server 2 since the video server 2 transmits each partial data constituting each playback unit to the video playback device 1 together with a partial header including the playback order specification information, the video playback device 1 refers to this playback order specification information.
  • the received partial data can be rearranged and reproduced.
  • a reproduction unit is composed of three partial data, and the reproduction order is partial data a, partial data b, and partial data c.
  • the video server 2 When the video server 2 acquires the three partial data a to c from the storages 3a to 3c in the order of the partial data a, the partial data c, and the partial data b, the three partial data a to c , Partial data c, and partial data b are transmitted to the video reproduction apparatus 1 in this order. For this reason, the transmission order in which the video server 2 transmits the partial data a to c to the video reproduction device 1, that is, the reception order in which the video reproduction device 1 receives the partial data a to c from the video server 2 is the partial data a to c. Instead of the playback order of c, the video server 2 obtains the partial data a to c from the storages 3a to 3c.
  • the video server 2 transmits the partial header (1 ') including the playback order designation information for designating the playback order (first) of the partial data a to the video playback device 1 together with the partial data a.
  • the partial header (3 ′) including the reproduction order designation information for designating the reproduction order (third) of the partial data c is transmitted to the video reproduction apparatus 1 together with the partial data c, and the reproduction order (2 of the partial data b is selected).
  • the partial header (2 ′) including the reproduction order designation information designating the (th) is transmitted to the video reproduction apparatus 1 together with the partial data b.
  • the video reproducing apparatus 1 refers to these three partial headers (1 ′) to (3 ′) to convert the three partial data a to c into the reproduction order (partial data a, partial data b, partial The data can be rearranged in the order of data c).
  • FIG. 12 is a sequence diagram illustrating another operation example of the communication system 100.
  • the example shown in FIG. 12 is an example in a case where the video server 2 cannot acquire some partial data constituting the content data for one playback unit without delay.
  • FIG. 12 the case where the content data is composed of two partial data as in FIG. 10 will be described as an example. Since the processing performed by the video playback device 1 and the processing performed by the video server 2 are the same as those in FIGS. 6 and 7, respectively, the same reference numerals are given and description thereof is omitted. The same processes as those in FIG. 10 are also given the same numbers.
  • the video playback device 1 requests the video server 2 to transmit the content data designated by the user (S101).
  • the video server 2 requests the storage 3a and the storage 3b to provide the partial data a and the partial data b constituting the requested content data (S102, S103).
  • the video server 2 When the video server 2 completes the acquisition of the partial data b from the storage 3b (S104), the video server 2 transmits the entire header to the video playback device (S105). In addition, the video server 2 transmits the acquired partial data b together with the partial header (2 ') corresponding to the partial data b to the video playback device 1 (S106).
  • the video reproduction device 1 since the reception of the partial data b has been delayed, the video reproduction device 1 notifies the video server 2 of the session disconnection (partial data reception interruption) (S110). When the notification of session disconnection is received, the video server 2 stops transmission of the remaining partial data a. On the other hand, when the video reproduction device 1 notifies the session disconnection, the partial data received so far is rearranged (S8), decoded, and reproduced (S9). However, in this example, since the partial data received so far is only the partial data a, the video reproduction device 1 decodes and reproduces the received partial data a without rearranging (S9).
  • FIG. 8A shows an HTTP message which is an example of a request message (content data request) transmitted from the video reproduction device 1 to the video server 2 in FIGS. 10 and 12.
  • the request message includes a request line and an “Accept” field.
  • HTTP / 1.1 indicating that this message is an HTTP message is described at the end of the request line
  • GET indicating that this message is an acquisition method (request message) is described at the top of the request line. Is described. Also, between these, reproduction unit designation information (/ content1 / 4000000/1) for designating a reproduction unit to be acquired is described.
  • the “Accept” field is a field that indicates a data format that can be processed by the video reproduction device 1, and here, fragmented MPEG4 transmitted in a multipart format is designated.
  • FIG. 9 is a diagram illustrating an HTTP message that is an example of a response message (content data for one playback unit) transmitted from the video server 2 to the video playback device 1 in FIGS. 10 and 12.
  • the HTTP message transmitted from the video server 2 to the video playback device 1 includes a status line, overall header information, partial header, partial data, and a delimiter.
  • the overall header includes information (Content-Location) indicating the location of the playback unit (media segment) transmitted in this response message, and the playback unit transmitted in this response message is the number of playback units in the content data. (“X-Media-Fragment-Index”) indicating whether or not.
  • the partial header includes a time stamp (X-timestamp) indicating the presentation time of the corresponding partial data, information (X-Bitrate) indicating the bit rate indicating the corresponding partial data, and the like.
  • this time stamp is used as reproduction order designation information for designating what number the corresponding partial data is to be reproduced.
  • Partial data is binary data (movie fragment) obtained by dividing encoded data.
  • a separator is included at the end of each playback unit.
  • a command (“X-ProcessCommand: sort”) for instructing the video reproduction device 1 to execute partial data rearrangement is used as a delimiter.
  • the delimiter is not limited to this and may be a character string that can be identified as a delimiter. For example, in FIG. 13, a character string “0” is used as a delimiter.
  • FIG. 13 is another example of a response message transmitted from the video server 2 to the video playback device 1 in FIGS. 10 and 12.
  • chunk transfer in HTTP is used.
  • the last partial data (partial data transmitted from the video server 2 to the video playback device 1 at the end of the partial data constituting the playback unit) is transferred from the video server 2 to the video playback device 1.
  • the delimiter may be described in the partial header corresponding to the last partial data.
  • the reproduction unit is composed of three partial data, and the reproduction order is partial data a, partial data b, and partial data c.
  • the video server 2 first completes the acquisition of the partial data a and the partial header (1) corresponding to the partial data a stored in the storage 3a, and then the partial data c and the partial header corresponding to the partial data c ( 3) is acquired second, and the partial data b and the partial header (2) corresponding to the partial data b are finally acquired.
  • the video playback device 1 Since the video server 2 transmits each partial data to the video playback device 1 in the order received, regardless of the playback order specified by each partial header, the video playback device 1 stores the partial data a and the partial data c. Partial data is transmitted in order. After the partial data c is transmitted, the video server 2 describes a delimiter in the partial header (2 ') corresponding to the partial data b, and then transmits the partial data b to the video reproduction device 1.
  • the delimiter may or may not be transmitted when there is only one partial data constituting the content data.
  • the communication system according to the first embodiment has a configuration in which the video playback device 1 rearranges content data for each playback unit, as described above. For this reason, in the video reproduction device 1 in which the size of the buffer 15 (hereinafter also referred to as “buffer size”) is smaller than the data size of the reproduction unit, content data for one reproduction unit cannot be stored in the buffer. This will hinder the sorting of content data.
  • buffer size the size of the buffer 15
  • the content data rearrangement in the video playback device 1 is not performed for each playback unit, but is performed for each small playback unit set according to the buffer size of the video playback device 1. adopt.
  • any video playback apparatus 1 that receives content data supplied from the video server 2 does not interfere with the rearrangement of the content data.
  • FIG. 15 shows the configuration of content data distributed to the video playback device 1 whose buffer size is X.
  • each reproduction unit Ui is a small reproduction unit (data size smaller than the buffer size X of the video reproduction device 1). Divided into small parts).
  • FIG. 16 is a flowchart showing the flow of processing in the video server 2 of the present embodiment.
  • the processes of S10 to S19 are the same as the processes shown in FIG.
  • the request message (content data request) from the video playback device 1 includes buffer size information (X-Accept-Buffer-Size) indicating the buffer size of the video playback device 1, as shown in FIG. 8B.
  • X-Accept-Buffer-Size buffer size information
  • the request generation unit 27 stores the partial data included in each small playback unit in the buffer size information included in the request message (content data request) from the video playback device 1 and the management table storage unit 28. Identify by referring to the management table. At this time, the total data size (described in the management table) of the partial data included in the small playback unit is set to be smaller than the buffer size (described in the request message) of the video playback device 1. For example, when the buffer size specified by the buffer size specification information is 8M bits and the data size of each partial data is 1M bits, the first partial playback of the 8 partial data from the beginning of the requested playback unit Specify as partial data to be included in the unit.
  • the request generation unit 27 specifies the storage 3 storing the partial data to be included in each small reproduction unit with reference to the management table stored in the management table storage unit 28, and specifies the specified storage 3 ( More precisely, a storage list including storage specification information for specifying the specified storage is generated. Then, the request generator 27 generates a request message (partial data request) for requesting provision of partial data to each storage 3 included in the storage list.
  • a delimiter is transmitted (S19).
  • the video server 2 completes the transmission of content data for one playback unit by repeating such transmission processing for each small playback unit.
  • FIG. 17 is a diagram illustrating the operation of the communication system 100 according to the flow of content data in the communication system 100.
  • the reproduction unit is composed of six partial data.
  • the buffer size of the video reproduction apparatus 1 is X
  • the data size of the partial data a is Sa
  • the data size of the partial data b is Sb
  • the data size of the partial data f is Sf
  • Sa + Sb + Sc ⁇ X ⁇ Sa + Sb + Sc + Sd holds.
  • the video server 2 constitutes the first small reproduction unit by the three partial data ac. Since Sd ⁇ Sd + Se ⁇ Sd + Se + Sf ⁇ X holds, the video server 2 forms the second small reproduction unit by the remaining three partial data d to f.
  • the video server 2 acquires the three partial data a to c constituting the first small reproduction unit constituting the first small reproduction unit from the storages 3a to 3c.
  • the video server 2 Two pieces of partial data a to c are transmitted to the video reproducing apparatus 1 in the order of partial data a, partial data c, and partial data b.
  • the video server 2 transmits a delimiter to the video reproduction device 1.
  • the video reproducing apparatus 1 receives this delimiter, it executes a rearrangement process on the partial data stored in the buffer 15, that is, the three partial data a to c constituting the first small reproduction unit. To do.
  • the video server 2 acquires from the storages 3d to 3f three pieces of partial data d to f constituting the second small reproduction unit.
  • the video server 2 Three pieces of partial data d to f are transmitted to the video reproduction apparatus 1 in the order of partial data e, partial data d, and partial data f.
  • the video server 2 transmits a delimiter to the video playback device 1.
  • the video playback device 1 performs a rearrangement process on the partial data stored in the buffer 15, that is, the three partial data a to c constituting the second small playback unit. Execute.
  • the video server 2 of the present embodiment transmits a delimiter to the video playback device 1 every time transmission of partial data constituting each small playback unit is completed.
  • the video reproduction apparatus 1 of the present embodiment rearranges the partial data stored in the buffer 15 every time a delimiter is received. For this reason, the total data size of the partial data waiting for the rearrangement process can be suppressed to be equal to or smaller than the buffer size of the video reproduction device 1.
  • the video server 2 starts acquiring the partial data d to f constituting the second small reproduction unit (acquisition from the storages 3d to 3f) because the partial data a to c constituting the first small reproduction unit is started. Acquisition (acquisition from the storages 3a to 3c) is completed or interrupted. That is, before the transmission of the partial data a to c constituting the first small reproduction unit (transmission to the video reproduction apparatus 1) is completed or interrupted, the partial data d to f constituting the second small reproduction unit is completed. Transmission (transmission to the video reproduction apparatus 1) is not started. Therefore, the total data size of the partial data waiting for the rearrangement process does not exceed the buffer size of the video reproduction device 1.
  • FIG. 17 shows a configuration in which the delimiter is transmitted after the last partial data (the partial data constituting each small playback unit is the last in the acquisition order). It is not limited to this.
  • a configuration in which a symbol is described in a partial header corresponding to the last partial data may be adopted.
  • FIG. 19 shows a configuration example of a response message corresponding to the transmission method shown in FIG.
  • the upper partial header is a partial header in which no delimiter is described
  • the lower partial header is a partial header in which a delimiter is described. It is.
  • a command (“X-ProcessCommand: sort”) that instructs the video reproduction device 1 to execute rearrangement of partial data is described as a delimiter in the lower partial header.
  • each fragment obtained by dividing the encoded data is transmitted as partial data to the video reproduction apparatus 1. Accordingly, when certain partial data is lost, the video reproduction device 1 hinders decoding of a reproduction unit including the partial data.
  • a packet is generated by adding an erasure correction code such as an FEC (Forward Error Correction) code to each fragment obtained by dividing the encoded data, and a packet group including a plurality of packets. Is adopted as a partial data to be transmitted to the video reproduction apparatus 1. Thereby, even if some partial data is lost, the video reproduction device 1 can decode the reproduction unit from the remaining partial data.
  • an erasure correction code such as an FEC (Forward Error Correction) code
  • FIG. 1 An example of a method for generating such partial data is shown in FIG.
  • the encoded data is divided into a plurality of reproduction units U1, U2,..., UM, and four partial data Uia, Uib, Uic, Uid are generated from each reproduction unit Ui. .
  • the reproduction unit Redundancy is added so that Ui can be reproduced.
  • M partial data (M is a natural number of 2 or more) is generated from each reproduction unit, and the reproduction unit can be reproduced from N partial data (N is a natural number smaller than M) among these M partial data.
  • N is a natural number smaller than M
  • FEC Forward Error Correction
  • FIG. 21 is a flowchart showing the flow of processing in the video reproduction apparatus 1 of the present embodiment.
  • the processes of S1 to S9 are the same as the processes shown in FIG.
  • the video server 2 has completed transmission of all the partial data (four partial data Uia, Uib, Uic, Uid in the example of FIG. 20) constituting each playback unit.
  • the transmission of the partial data necessary for restoring each reproduction unit (any three of the four partial data Uia, Uib, Uic, Uid in FIG. 20) is completed.
  • the rearrangement processing unit 16 converts the partial data stored in the buffer 15 into partial headers corresponding to the partial data (Reordering is performed with reference to (including reproduction order designation information) (S8), and the decoding unit 14 further performs FEC decoding on the partial data rearranged by the rearrangement processing unit 16, thereby restoring the encoded data ( S22). Thereafter, the decoding unit 14 decodes the content from the restored encoded data, and the reproduction unit 19 displays the content decoded by the decoding unit 14 (S9).
  • FIG. 22 is a flowchart showing the flow of processing in the video server 2 of the present embodiment.
  • the processes of S11 to S19 are the same as the processes shown in FIG.
  • the flowchart shown in FIG. 22 is a modification of the flowchart shown in FIG. 7 so that a delimiter is transmitted after the transmission of the partial data necessary for restoring each reproduction unit is completed. That is, steps S23 to S25 described below are added to the flowchart shown in FIG. 7, and the value of the counter indicating the number of transmitted partial data reaches the number of partial data necessary to restore the reproduction unit. Thus, the delimiter transmission process S19 is executed.
  • Process S23 is a process of clearing a counter indicating the number of transmitted partial data after completing the entire header transmission process S15. Specifically, this is a process of initializing the counter value to zero.
  • the process S24 is a process of updating the counter value described above every time the transmission process S16 of each partial data is completed. Specifically, this is a process of incrementing the counter value by one.
  • the process S25 is a process for determining whether or not the updated counter value is smaller than the threshold value every time the above-described counter update process S24 is completed.
  • a delimiter transmission process S19 is executed.
  • the threshold is a value set in advance as the number of partial data necessary to restore each reproduction unit, and the FEC coding rate to be used (the size of the original coded data and the size of the erasure correction code). Ratio).
  • FIG. 23 is a diagram exemplifying a response message (content data for one playback unit) transmitted from the video server 2 that performs the processing of FIG. 22 to the video playback device 1.
  • the response message shown in FIG. 23 is configured as a multipart HTTP message, and includes a status line, whole header information, a partial header, partial data, and a delimiter.
  • a characteristic feature of this response message is that encoding method specifying information (“Content-Encoding”) for specifying the encoding method of content data is described in the header, and an FEC code (Raptor FEC) is used as the encoding method. It is a specified point. Further, a command (“X-ProcessCommand: sort, raptor_dec”) for instructing the video playback apparatus 1 to execute the partial data rearrangement process and the FEC decoding is used as a delimiter indicating the end of each playback unit. It is a point.
  • the command used as the delimiter is not limited to the example shown in FIG. 23 as long as it specifies a process to be executed by the video reproduction apparatus 1 when the delimiter is received.
  • the example shown in FIG. 23 explicitly instructs execution of these two processes when the rearrangement process and the FEC decoding process are implemented as separate processes. Is implemented as part of the FEC decoding process, the description “sort” that instructs execution of the rearrangement process becomes unnecessary.
  • the response message transmitted from the video server 2 to the video playback device 1 may also be a response message using chunk transfer as described with reference to FIG.
  • the delimiter may be described in the partial header corresponding to the last partial data as described with reference to FIG.
  • the video server 2 registers a request message (partial data request) for requesting provision of each partial data in the management table in advance as one storage (storage storing the partial data). 1 is used, but the present invention is not limited to this.
  • a configuration may be adopted in which the video server 2 transmits a request message (partial data request) for requesting provision of each partial data to N storages (N ⁇ 2). That is, a configuration in which each partial data is acquired in parallel from N storages may be employed.
  • N storages N ⁇ 2
  • each partial data constituting the content data is accumulated in at least one (preferably two or more) of the N storages.
  • a request message may be transmitted by selecting a storage with sufficient processing capacity.
  • each block of the video reproduction device 1, the video server 2, and the storage 3, especially the control unit 13, the monitoring unit 18, the monitoring unit 22, and the monitoring unit 31, are logical circuits formed on an integrated circuit (IC chip). May be realized by hardware, or may be realized by software using a CPU (Central Processing Unit).
  • IC chip integrated circuit
  • CPU Central Processing Unit
  • the video playback device 1, video server 2, and storage 3 include a CPU that executes program instructions for realizing each function, a ROM (Read (Memory) that stores the program, and a RAM (RAM that expands the program). Random Access Memory), and a storage device (recording medium) such as a memory for storing the program and various data.
  • the object of the present invention is to provide program codes (execution format program, intermediate code program, source program) of control programs for the video playback device 1, video server 2, and storage 3 which are software for realizing the above-described functions on a computer.
  • the computer or CPU or MPU
  • Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R.
  • IC cards including memory cards
  • semiconductor memories such as mask ROM / EPROM / EEPROM / flash ROM, or PLD (Programmable logic device) or FPGA (Field Programmable Gate Array) Logic circuits can be used.
  • the program code may be supplied to the video reproduction device 1, the video server 2, and the storage 3 via a communication network.
  • the communication network is not particularly limited as long as it can transmit the program code.
  • the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network (Virtual Private Network), telephone line network, mobile communication network, satellite communication network, etc. can be used.
  • the transmission medium constituting the communication network may be any medium that can transmit the program code, and is not limited to a specific configuration or type.
  • wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line, infrared rays such as IrDA and remote control, Bluetooth (registered trademark), IEEE 802.11 wireless, HDR ( It can also be used by wireless such as High Data Rate, NFC (Near Field Communication), DLNA (Digital Living Network Alliance), mobile phone network, satellite line, and terrestrial digital network.
  • wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line, infrared rays such as IrDA and remote control, Bluetooth (registered trademark), IEEE 802.11 wireless, HDR ( It can also be used by wireless such as High Data Rate, NFC (Near Field Communication), DLNA (Digital Living Network Alliance), mobile phone network, satellite line, and terrestrial digital network.
  • wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line,
  • the transmission apparatus when the partial data acquisition unit is requested to transmit the specific part of the content data from the other apparatus, the partial data belonging to the specific part is parallelly transmitted to the one or more partial data.
  • the partial data transmission means obtains from the storage device, and the partial data transmission means transmits the partial data belonging to the specific part after the transmission to the other device or the last of the partial data belonging to the specific part. It is preferable that information indicating that transmission of the specific part is completed is transmitted to the other device in association with the partial data to be transmitted.
  • other devices can receive the partial data constituting each part (specific part) constituting the content data without delay.
  • the partial data acquisition unit when the partial data acquisition unit is requested to transmit the specific part of the content data from the other apparatus, the partial data acquisition unit belongs to each small part obtained by dividing the specific part.
  • the partial data is acquired from the one or more storage devices in parallel, and the partial data transmitting means transmits the partial data belonging to each small portion to the other device each time or after the transmission. It is preferable that information indicating that the transmission of the small part is completed is transmitted to the other device in association with the partial data to be transmitted last among the partial data belonging to the part.
  • another device can rearrange the partial data constituting each part (specific part) constituting the content data for each small part. Therefore, the above configuration is advantageous when the size of the buffer for storing the partial data to be rearranged is small.
  • the request from the other device includes buffer size designation information indicating the buffer size of the other device
  • the partial data acquisition means includes a portion belonging to each small portion. It is preferable to divide the specific portion so that the total data size of the data is smaller than the buffer size specified by the buffer size specifying information.
  • the partial data acquisition unit when the partial data acquisition unit is requested to transmit the specific part of the content data from the other apparatus, the M parts obtained by encoding the specific part M pieces of partial data that can be restored from the N pieces (N ⁇ M) of partial data by erasure correction are acquired from the one or more storage devices in parallel.
  • the partial data transmission means is for transmitting the N partial data acquired previously from the M partial data acquired by the partial data acquisition means to the other apparatus in the order in which the acquisition has been completed. After the transmission of the N partial data to the other device, or in association with the last partial data to be transmitted among the N partial data, the transmission of the specific part is completed. Affection And transmits to the other device, it is preferable.
  • the content data can be transmitted more efficiently when the content data is encoded so that it can be lost.
  • the partial data transmission means transmits the partial data constituting the specific part and information indicating that the transmission of the partial data is completed as a multipart HTTP message. It is preferable.
  • a plurality of partial data to be transmitted in response to one request can be transmitted as one HTTP message.
  • the data structure of the content data transmitted from the transmission device described above (that is, a plurality of partial data constituting the content data, and reproduction order designation information associated with each of the plurality of partial data
  • the data structure of the content data characterized by including reproduction order designation information for designating the reproduction order of the data is also included in the category of the present invention.
  • a program for operating a computer as the above-described transmitting device a program for operating the computer as the above-described receiving device, and a computer-readable recording medium on which these programs are recorded are also within the scope of the present invention. included.
  • the present invention can be used for an apparatus that transmits or receives content data via a communication network.

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  • Television Signal Processing For Recording (AREA)

Abstract

L'invention concerne un serveur d'images (2) doté des éléments suivants : une unité de réception (21) qui acquiert, auprès d'une ou une pluralité d'unité de stockage (3), une pluralité de blocs de données partielles qui configurent des données de contenu à un moment où la transmission des données de contenu est requise par un dispositif de reproduction d'image (1) ; et une unité d'émission (26) qui associe respectivement les données partielles avec des informations qui spécifient l'ordre de reproduction des données partielles, lesdites données partielles ayant été acquises par l'unité de réception (21), et qui émet les données partielles vers le dispositif de reproduction d'image (1) dans l'ordre dans lequel l'unité de réception (21) a achevé l'acquisition.
PCT/JP2011/066378 2010-07-20 2011-07-19 Dispositif d'émission, procédé d'émission, dispositif de réception, procédé de réception, système de communication, structure de données, programme et support de stockage WO2012011473A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014131171A (ja) * 2012-12-28 2014-07-10 Canon Inc 送信装置、受信装置、送信方法、受信方法、及び、プログラム
JP2015121971A (ja) * 2013-12-24 2015-07-02 株式会社リコー 情報処理システム、情報処理装置、情報処理方法および情報処理プログラム
EP2908535A4 (fr) * 2012-10-09 2016-07-06 Sharp Kk Dispositif de transmission de contenu, dispositif de lecture de contenu, système de diffusion de contenu, procédé de commande de dispositif de transmission de contenu, procédé de commande de dispositif de lecture de contenu, programme de commande et support d'enregistrement
JP2018014756A (ja) * 2017-09-26 2018-01-25 キヤノン株式会社 送信装置、送信方法、及び、プログラム
JP2018156692A (ja) * 2018-06-14 2018-10-04 株式会社リコー 情報処理システム、画像形成装置、情報処理装置、情報処理方法および情報処理プログラム
US20220405204A1 (en) * 2021-06-17 2022-12-22 Fujitsu Limited Computer-readable recording medium storing data placement program, processor, and data placement method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001313928A (ja) * 2000-05-02 2001-11-09 Noritsu Koki Co Ltd データ受信装置、データ受信方法、データ受信処理を行うためのプログラムを記録した記録媒体、データ配信装置、データ配信方法、データ配信処理を行うためのプログラムを記録した記録媒体およびデータ配信システム
JP2006146294A (ja) * 2004-11-16 2006-06-08 Dainippon Printing Co Ltd データ保管制御システム
JP2006301849A (ja) * 2005-04-19 2006-11-02 Global Friendship Inc 電子情報保存システム
JP2008067102A (ja) * 2006-09-07 2008-03-21 Victor Co Of Japan Ltd コンテンツ配信サーバ
JP2008278198A (ja) * 2007-04-27 2008-11-13 Nippon Telegr & Teleph Corp <Ntt> マルチメディア情報転送蓄積方法、分散型マルチメディアサーバ装置、分散型マルチメディアサーバシステム、マルチメディア情報転送蓄積方法を実現するプログラムおよび当該プログラムを記録した記録媒体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001313928A (ja) * 2000-05-02 2001-11-09 Noritsu Koki Co Ltd データ受信装置、データ受信方法、データ受信処理を行うためのプログラムを記録した記録媒体、データ配信装置、データ配信方法、データ配信処理を行うためのプログラムを記録した記録媒体およびデータ配信システム
JP2006146294A (ja) * 2004-11-16 2006-06-08 Dainippon Printing Co Ltd データ保管制御システム
JP2006301849A (ja) * 2005-04-19 2006-11-02 Global Friendship Inc 電子情報保存システム
JP2008067102A (ja) * 2006-09-07 2008-03-21 Victor Co Of Japan Ltd コンテンツ配信サーバ
JP2008278198A (ja) * 2007-04-27 2008-11-13 Nippon Telegr & Teleph Corp <Ntt> マルチメディア情報転送蓄積方法、分散型マルチメディアサーバ装置、分散型マルチメディアサーバシステム、マルチメディア情報転送蓄積方法を実現するプログラムおよび当該プログラムを記録した記録媒体

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2908535A4 (fr) * 2012-10-09 2016-07-06 Sharp Kk Dispositif de transmission de contenu, dispositif de lecture de contenu, système de diffusion de contenu, procédé de commande de dispositif de transmission de contenu, procédé de commande de dispositif de lecture de contenu, programme de commande et support d'enregistrement
JP2014131171A (ja) * 2012-12-28 2014-07-10 Canon Inc 送信装置、受信装置、送信方法、受信方法、及び、プログラム
JP2015121971A (ja) * 2013-12-24 2015-07-02 株式会社リコー 情報処理システム、情報処理装置、情報処理方法および情報処理プログラム
US10146487B2 (en) 2013-12-24 2018-12-04 Ricoh Company, Ltd. Information processing system, apparatus, and method
JP2018014756A (ja) * 2017-09-26 2018-01-25 キヤノン株式会社 送信装置、送信方法、及び、プログラム
JP2018156692A (ja) * 2018-06-14 2018-10-04 株式会社リコー 情報処理システム、画像形成装置、情報処理装置、情報処理方法および情報処理プログラム
US20220405204A1 (en) * 2021-06-17 2022-12-22 Fujitsu Limited Computer-readable recording medium storing data placement program, processor, and data placement method
US11853211B2 (en) * 2021-06-17 2023-12-26 Fujitsu Limited Computer-readable recording medium storing data placement program, processor, and data placement method

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