JP2013236117A - Receiver, file caching method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce congestion in a network and a server when content coordinating broadcast and communication is delivered.SOLUTION: A section data decoding unit 404 extracts a file from a broadcast wave. A recording unit records the file extracted by the section data decoding unit 404 in a storage unit 406. When a transmission request of a file is performed by a URI, a determination unit 410 determines whether the file associated with the URI is stored in the storage unit 406 or not. If the file associated with the URI of the transmission request is stored in the storage unit 406, an output unit 412 outputs the file.

Description

  The present invention relates to a receiver that receives broadcast waves, a file caching method using the receiver, and a program thereof.

  In recent years, data broadcasting services have been provided in digital television broadcasting, and various information can be displayed on a receiver screen in addition to conventional video content. Information transmitted by data broadcasting is multiplexed on a broadcast wave in a BML (Broadcast Markup Language) format defined in Non-Patent Document 1. Thereby, the receiver can display information related to the video content currently being broadcast on the screen.

  Patent Document 1 discloses a technique for converting a document in HTML (Hyper Text Markup Language) format into BML format.

JP 20031677872 A

"Data Broadcast Coding System and System Standard for Digital Broadcasting", ARIB STD-B24, 5.4 edition, Japan Radio Industry Association, December 16, 2009

  In recent years, provision of contents in which broadcasting and communication are linked has been studied. When providing such content, a receiver connected to the network collects files related to the program from a server on the network. If the content on the network linked to the program is set to start automatically when the broadcast program starts, or if there is an effect that prompts access to the content on the network during the broadcast program, many There is a concern that a file request will be sent from the receiver to the server at the same time, resulting in congestion in the network and server.

  An object of the present invention is to provide a receiver, a file caching method, and a program that can reduce network and server congestion.

  The present invention has been made to solve the above-described problem, and a broadcast receiving unit that receives a broadcast wave from a broadcast transmission device, and a file associated with a URI are extracted from the broadcast wave received by the broadcast receiving unit. A file extracting unit, a recording unit that records the file extracted by the file extracting unit in the storage unit in association with the URI, a receiving unit that receives an output request for a file indicated by the URI, and a URI that is received by the receiving unit. A determination unit that determines whether or not an associated file is stored in the storage unit, and the file when the determination unit determines that a file associated with the URI is recorded in the storage unit Is obtained from the storage unit, and it is determined that the file associated with the URI is not recorded in the storage unit. A file acquisition unit for acquiring from a network, characterized by comprising an output section for outputting a file that the file acquisition unit has acquired.

  In the present invention, the file extraction unit further extracts version information of the file from the broadcast wave, and the version information of the file extracted by the file extraction unit is associated with the same URI as the file. A version determination unit that determines whether or not the version information of the file recorded in the storage unit is the same, and a version determination unit that determines that the version information is different by the version determination unit. An update notification unit that notifies the occurrence of an update, and the recording unit stores a file stored in the storage unit when the version determination unit determines that the version information is different, the file extraction unit Is preferably updated to the newly extracted file.

  In the present invention, the file extraction unit further includes an event notification unit that further extracts an event message from the broadcast wave and notifies the event message when the file extraction unit extracts the event message. Is preferred.

  In the present invention, the file is preferably multiplexed with the broadcast wave by a data carousel method.

  In the present invention, it is preferable to include a router unit that transfers an output request output from a device connected to the own apparatus to the accepting unit and transfers a file output from the output unit to the device.

  The present invention is also a file caching method using a receiver, wherein the broadcast receiving unit receives a broadcast wave from a broadcast sending device, and the file extraction unit receives a URI from the broadcast wave received by the broadcast receiving unit. And the recording unit records the file extracted by the file extraction unit in the storage unit in association with the URI, the reception unit receives an output request for the file indicated by the URI, and the determination unit And determining whether a file associated with the URI received by the reception unit is stored in the storage unit, and the file acquisition unit records the file associated with the URI by the determination unit in the storage unit. If it is determined that the file is obtained from the storage unit, the file associated with the URI is not recorded in the storage unit. It acquires the file from a network if it is constant, the output unit, and outputs the file to the file acquisition unit has acquired.

  The present invention also provides a receiver, a broadcast receiving unit that receives a broadcast wave from a broadcast transmission device, a file extraction unit that extracts a file associated with a URI from the broadcast wave received by the broadcast receiving unit, and the file extraction A recording unit that records the file extracted by the unit in the storage unit in association with the URI, a reception unit that receives an output request for the file indicated by the URI, and a file that is associated with the URI received by the reception unit is stored in the storage unit A determination unit that determines whether the file is associated with the URI when the determination unit determines that the file associated with the URI is recorded in the storage unit, and associates the file with the URI File acquisition to acquire the file from the network when it is determined that the recorded file is not recorded in the storage unit A program for functioning as an output unit for outputting a file that the file acquisition unit has acquired.

  According to the present invention, a receiver extracts a file from a broadcast wave and records it in a storage unit. When a file transmission request is made by a URI, the file associated with the URI is stored in the storage unit. If so, output the file. As a result, the receiver can reduce network and server congestion.

It is a schematic block diagram which shows the structure of a broadcast communication cooperation system provided with the receiver by one Embodiment of this invention. It is a figure which shows the association method of the file to the module. It is a schematic block diagram which shows the structure of the receiver by this embodiment. It is a flowchart which shows the operation | movement at the time of the file output request reception by the receiver by this embodiment. It is a flowchart which shows the operation | movement at the time of the broadcast wave reception by the receiver by this embodiment. It is a flowchart which shows the reception operation | movement of the event message by the receiver by this embodiment. It is a schematic block diagram which shows the structure of the receiver by other embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram illustrating a configuration of a broadcasting / communication cooperation system including a receiver 400 according to an embodiment of the present invention.
The broadcasting / communication cooperation system is a system that allows a user to browse broadcasting content and communication content, and includes a broadcasting transmission device 100, a server device 200, a router 300, a receiver 400, and a user terminal 500. The router 300, the receiver 400, and the user terminal 500 are devices owned by the user. The broadcast content transmitted by the broadcast transmission apparatus 100 is also received by the conventional receiver 600.

The broadcast transmission device 100 multiplexes broadcast contents such as video and files normally provided as communication contents such as HTML files and image files, and transmits them in a broadcast wave. The broadcast sending apparatus 100 sends a file by mapping a plurality of files to one module in a multipart description format, and multiplexing and sending the module to a broadcast wave by a data carousel method. Moreover, a URI (Uniform Resource Identifier) for accessing a file mapped to the module is associated with the module transmitted by the broadcast transmission apparatus 100.
The server device 200 receives a file output request based on a URI via the Internet, and outputs a file indicated by the URI.

The router 300 transfers a packet received from a device connected to a LAN (Local Area Network) to a destination indicated by the packet. However, when the destination of the packet is a device outside the LAN and the transmission source is not the receiver 400, the router 300 transfers the packet to the receiver 400. Specifically, in the routing table stored in the router 300, all communications from outside the LAN other than the receiver 400, or web access packets outside the LAN from outside the receiver 400 (access to port 80) Are set to be routed to the receiver 400, the transfer can be performed.
The receiver 400 receives the broadcast wave sent from the broadcast sending device 100 and displays the broadcast content. The receiver 400 receives a file output request based on a URI from the user terminal 500 via the router 300, and uses the file when a module that stores the file associated with the URI is included in the broadcast wave. To the user terminal 500. On the other hand, when the module that stores the file associated with the URI is not included in the broadcast wave, the receiver 400 transfers the file output request to the server device 200. That is, according to the present embodiment, the receiver 400 functions as a transparent proxy server by the routing of the router 300.

  The user terminal 500 is a device such as a PC (Personal Computer), a tablet terminal, or a mobile phone, and is a file based on a URI by executing a Web browser that is software for browsing WWW (World Wide Web) information. An output request is output, and the file obtained by the file output request is displayed.

Here, first, the operation of the broadcast transmission apparatus 100 for multiplexing the module with the broadcast wave will be described.
The broadcast transmission device 100 maps a module storing a communication content file to an ES (Elementary Stream), and multiplexes it to a broadcast wave together with an ES of video / audio or A profile (data broadcasting for a fixed television) and transmits the broadcast wave. . That is, transmission by the data carousel is performed in a three-layer directory structure of ES / module / file.

FIG. 2 is a diagram illustrating a method of associating a file with a module.
In the present embodiment, since the user terminal 500 appears to access the server device 200 on the network using HTTP (HyperText Transfer Protocol), it is not preferable to limit the directory structure. Therefore, as shown in FIG. 2, the broadcast transmission apparatus 100 sets the file group and the file group for each file group directly under an arbitrary directory (that is, a file group excluding files included in subdirectories immediately under the directory). The URI of the directory to be stored (directory URI) is associated with the module. Note that the module transmitted by the broadcast transmission apparatus 100 includes version information of the module. Since the module is composed of a plurality of files, the file version is synonymous with the version of the module that transmits the file.

  Note that the broadcast sending apparatus 100 uses a part of the plurality of ESs for transmission of the module storing the communication content file, and uses the remaining ESs for transmission of the module storing the conventional BML file. At this time, it is preferable to define which ES is used for file transmission by this method and which ES is used for BML transmission in a PMT (Program Map Table) inserted into the TS. Further, in the conventional receiver 600, the BML of the ES with the component tag value 40 is read for the first time, and the other BML linked to the read BML is sequentially read. Therefore, the broadcast transmission apparatus 100 can prevent malfunction in the conventional receiver 400 by not establishing a link from the BML to the ES storing the file according to the present method.

Next, the receiver 400 will be described.
FIG. 3 is a schematic block diagram showing the configuration of the receiver 400 according to the present embodiment.
The receiver 400 includes a broadcast receiving unit 401, a TS decoding unit 402, a video / audio decoding unit 403, a section data decoding unit 404 (file extraction unit), a display unit 405, a storage unit 406, a recording unit 407, a version determination unit 408, A reception unit 409, a determination unit 410, a file acquisition unit 411, an output unit 412, an update notification unit 413, and an event notification unit 414 are provided.

The broadcast receiving unit 401 receives broadcast waves sent from the broadcast sending device 100.
The TS decoding unit 402 separates a TS (Transport Stream) multiplexed on a broadcast wave into PES (Packetized Elementary Stream) data and section data.
The video / audio decoding unit 403 decodes the PES data separated from the TS by the TS decoding unit 402 into video content.
The section data decoding unit 404 decodes the module from the section data separated from the TS by the TS decoding unit 402.
The display unit 405 displays the video content decoded by the video / audio decoding unit 403 on the display, and if there is a function to display the BML file of the conventional data broadcast decoded by the section data decoding unit 404, this is also displayed on the display To do.

The storage unit 406 converts the file decrypted by the section data decryption unit 404 into a directory URI that identifies the directory in which the file is stored, a file name that identifies the file, and version information of the module in which the file is stored. Store it in association.
When a file associated with the same directory URI as the module decrypted by the section data decryption unit 404 is not recorded in the storage unit 406, the recording unit 407 associates the file with the directory URI, the file name, and the version information. To be recorded in the storage unit 406. In addition, when the recording unit 407 determines that the module decoded by the section data decoding unit 404 by the version determination unit 408 is newer than the version associated with the file stored in the storage unit 406, the storage unit 406 stores the module. Update the file.
The version determination unit 408 compares the module version information decoded by the section data decoding unit 404 with the version information stored in the storage unit 406 in association with the same directory URI.

The accepting unit 409 accepts a file output request based on the URI from the user terminal 500 via the router 300.
The determination unit 410 stores in the storage unit 406 the file associated with the URI indicated by the file output request received by the reception unit 409 (that is, the URI obtained by the combination of the directory URI and the file name associated with the file). It is determined whether or not it has been done.
When the file associated with the URI indicated by the file output request received by the reception unit 409 is stored in the storage unit 406, the file acquisition unit 411 acquires the file from the storage unit 406, and the reception unit 409 receives the file. When the file associated with the URI indicated by the file output request is not stored in the storage unit 406, the file is acquired from the server device 200 via the Internet.
The output unit 412 outputs the file acquired by the file acquisition unit 411 to the user terminal 500.

When the update notification unit 413 determines that the version information of the module decoded by the section data decoding unit 404 by the version determination unit 408 is newer than the version information associated with the file stored in the storage unit 406, the update notification unit 413 updates the file. Occurrence of occurrence is converted into a bidirectional communication format that can be received by the Web browser of the user terminal 500, such as WebSocket, and notified.
When the event notification unit 414 includes an event message in the information decrypted by the section data decryption unit 404, the event notification unit 414 can receive the event message to the user terminal 500 in a bidirectional manner that can be received by the Web browser of the user terminal 500 such as WebSocket. Convert to communication format and notify.

FIG. 4 is a flowchart illustrating an operation when a file output request is received by the receiver 400 according to the present embodiment.
When the reception unit 409 of the receiver 400 receives a file request from the user terminal 500 (step S1), the determination unit 410 determines whether or not a file associated with the URI included in the file request is stored in the storage unit 406. Is determined (step S2).

  When the determination unit 410 determines that the file associated with the URI included in the file request is stored in the storage unit 406 (step S2: YES), the file acquisition unit 411 stores the file stored in the storage unit 406. Then, it is determined whether or not it is being updated by the recording unit 407 (step S3). When it is determined that the file is being updated (step S3: YES), the file acquisition unit 411 repeatedly executes the determination in step S3 until the file update is completed. On the other hand, if the file acquisition unit 411 determines that the file is not being updated (step S3: NO), the file acquisition unit 411 acquires a file associated with the URI from the storage unit 406 (step S4).

  On the other hand, when the determination unit 410 determines that the file associated with the URI included in the file request is not stored in the storage unit 406 (step S2: NO), the file acquisition unit 411 receives the URI via the Internet. To access the server device 200 and acquire a file from the server device 200 (step S5). When the file acquisition unit 411 acquires a file in step S4 or step S5, the output unit 412 outputs the file to the user terminal 500 (step S6).

  As described above, the receiver 400 can reduce the congestion of the network and the server by previously recording the files that are expected to be concentrated in the storage unit 406. Note that the file recorded in the storage unit 406 may be the same as or different from the file that can be acquired from the server device 200 indicated by the URI. For example, the server device 200 may store normal content in association with the same URI, and the storage unit 406 of the receiver 400 may store special content that can be seen only by the program viewer.

In particular, since the communication congestion can be prevented by recording the content in the storage unit 406 of the receiver 400, the content stored in the storage unit 406 of the receiver 400 is the Web browser of the user terminal 500 such as WebSocket. It is preferable that the content be capable of receiving a two-way communication method capable of receiving. That is, the file of the receiver 400 is updated at the program switching timing, and the update of the file is notified from the receiver 400 to the user terminal 500 by a bidirectional communication method that can be received by the Web browser of the user terminal 500 such as WebSocket. As a result, the user terminal 500 can develop the content in synchronization with the progress of the program.
At this time, the user terminal 500 that has received the notification from the receiver 400 by a bidirectional communication method that can be received by the Web browser of the user terminal 500 such as WebSocket is the Web browser of the user terminal 500 such as JavaScript Use the script that runs above to update the display or reload the page, transition to another page, etc. Note that, when browsing of the page is completed on the user terminal 500, the bidirectional communication method that can be received by the Web browser of the user terminal 500 such as WebSocket is closed, and monitoring by the receiver 400 is ended.

FIG. 5 is a flowchart showing an operation at the time of broadcast wave reception by the receiver 400 according to the present embodiment.
When the broadcast receiving unit 401 of the receiver 400 receives a broadcast wave (step S11), the TS decoding unit 402 separates the TS multiplexed on the broadcast wave into PES data and section data (step S12). At this time, the video / audio decoding unit 403 decodes the PES data into video content and outputs the video content to the display unit 405. On the other hand, the section data decoding unit 404 decodes the module from the section data (step S13).

  Next, the recording unit 407 determines whether a file associated with the same directory URI as the decrypted module has already been recorded in the storage unit 406 (step S14). When the recording unit 407 determines that a file associated with the same directory URI as the decrypted module is not recorded in the storage unit 406 (step S14: NO), the recording unit 407 determines the directory URI, file name, and version information. And recorded in the storage unit 406 (step S15).

  On the other hand, when the recording unit 407 determines that a file associated with the same directory URI as the decrypted module is already recorded in the storage unit 406 (step S14: YES), the version determination unit 408 And the version information stored in the storage unit 406 in association with the same directory URI as the module. Then, the version determination unit 408 determines whether or not the decrypted directory version is newer than the module version in which the file stored in the storage unit 406 is stored (step S16). If the version determination unit 408 determines that the version of the decrypted module is not new (step S16: NO), the file update process ends.

  When the version determination unit 408 determines that the version of the decrypted module is newer than the version of the module in which the file stored in the storage unit 406 is stored (step S16: YES), the recording unit 407 All the files associated with the same directory URI are deleted from the storage unit 406 (step S17). Next, the recording unit 407 records the file stored in the decrypted module in the storage unit 406 in association with the directory URI, the file name, and the version information (step S18).

Then, the update notification unit 413 sends a user terminal 500 such as WebSocket to the user terminal 500 that has established a bidirectional communication connection that can be received by the Web browser of the user terminal 500 such as WebSocket. It is notified that the file has been updated through the bidirectional communication method that can be received by the Web browser (step S19). Thereby, the receiver 400 can provide the content synchronized with the progress of the program at the user terminal 500.
When the reception unit 409 receives a file output request from the user terminal 500 during the file update, the file acquisition operation is suspended according to the determination in step S3, so that the old and new files in the same directory URI can be stored. Avoid mixing.

In addition, the receiver 400 performs the event message reception process described below in parallel with the processes in steps S14 to S19 described above.
FIG. 6 is a flowchart showing an event message reception operation by the receiver 400 according to the present embodiment.
The event notification unit 414 determines whether an event message is included in the module decoded from the section data in step S13 (step S20). If it is determined that the event message is not included in the module decoded from the section data (step S20: NO), the event notification unit 414 ends the process. On the other hand, when the event notification unit 414 determines that the event message is included in the module decoded from the section data (step S20: YES), the event notification unit 414 is capable of receiving the own device and the Web browser of the user terminal 500 such as WebSocket. The event message is notified to the user terminal 500 that has established the connection of the communication method through the bidirectional communication method that can be received by the Web browser of the user terminal 500 such as WebSocket (step S21), and the processing is ended. .

  As described above, according to the present embodiment, the receiver 400 extracts a file from the broadcast wave, records the file in the storage unit 406, and stores the URI in the storage unit 406 when the file transmission request is made by the URI. When the associated file is stored, the file is output. As a result, the receiver 400 can reduce network and server congestion.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to
For example, in the present embodiment, a case has been described in which the receiver 400 receives an output request from the user terminal 500 and outputs a file to the user terminal 500. However, the present invention is not limited to this. When having a function, the receiving unit 409 may receive an output request from the Web browser function unit, and the output unit 412 may output a file to the Web browser.

  In this embodiment, the case where the receiver 400 and the user terminal 500 are connected to the router 300 and the router 300 routes an output request from the user terminal 500 to the receiver 400 has been described. I can't. For example, the receiver 400 may be provided between the user terminal 500 and the router 300 like a switching hub, and the signal from the user terminal 500 may be monitored.

FIG. 7 is a schematic block diagram illustrating a configuration of a receiver 400 according to another embodiment.
Further, as shown in FIG. 7, the receiver 400 may be configured to include a router unit 415 having a router function.
Specifically, the router unit 415 transfers the packet output from the user terminal 500 and the file acquisition unit 411 to the destination indicated by the packet. At this time, when the destination of the packet (including the output request) output from the user terminal 500 is a device outside the LAN, the router unit 415 outputs the packet to the reception unit 409. Also, the router unit 415 transfers the file output by the output unit 412 to the user terminal 500. As a result, even in a configuration that does not include the router 300, the same effects as those of the above-described embodiment can be obtained.

  Further, the user terminal 500 obtains an IP address by sending a host name to a DNS (Domain Name System) server in order to convert the host name portion in the URI into an IP address. If there is a DNS server in the LAN, The DNS server may be set so that this IP address returns the IP address of the receiver 400. Alternatively, the router 300 may forcibly acquire an inquiry to the DNS server transmitted from the user terminal 500 and return the IP address of the receiver 400.

  The receiver 400 described above has a computer system inside. The operation of each processing unit described above is stored in a computer-readable recording medium in the form of a program, and the above processing is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  DESCRIPTION OF SYMBOLS 100 ... Broadcast transmission apparatus 200 ... Server apparatus 300 ... Router 400 ... Receiver 401 ... Broadcast receiving part 402 ... TS decoding part 403 ... Video / audio decoding part 404 ... Section data decoding part (file extraction part) 405 ... Display part 406 ... Storage unit 407 ... Recording unit 408 ... Version determination unit 409 ... Reception unit 410 ... Determination unit 411 ... File acquisition unit 412 ... Output unit 413 ... Update notification unit 414 ... Event notification unit 415 ... Router unit 500 ... User terminal 600 ... Conventional Receiver

Claims (7)

A broadcast receiver for receiving broadcast waves from the broadcast transmitter;
A file extraction unit for extracting a file associated with a URI from a broadcast wave received by the broadcast reception unit;
A recording unit that records the file extracted by the file extraction unit in the storage unit in association with the URI;
A reception unit that receives an output request for a file indicated by a URI;
A determination unit that determines whether a file associated with the URI received by the reception unit is stored in the storage unit;
When the determination unit determines that the file associated with the URI is recorded in the storage unit, the file is acquired from the storage unit, and the file associated with the URI is recorded in the storage unit. A file acquisition unit that acquires the file from the network when it is determined that it is not,
An output unit that outputs the file acquired by the file acquisition unit. The file extraction unit further extracts version information of the file from the broadcast wave,
A version determination unit that determines whether the version information of the file extracted by the file extraction unit is the same as the version information of the file recorded in the storage unit in association with the same URI as the file;
An update notification unit for notifying the occurrence of an update of the file when the version determination unit determines that the version information is different;
When the version determination unit determines that the version information is different, the recording unit updates a file stored in the storage unit to a file newly extracted by the file extraction unit. The receiver according to claim 1. The file extraction unit further extracts an event message from the broadcast wave,
The receiver according to claim 1, further comprising: an event notification unit that notifies the event message when the file extraction unit extracts the event message. The receiver according to any one of claims 1 to 3, wherein the file is multiplexed on the broadcast wave by a data carousel method. 5. The router according to claim 1, further comprising: a router unit that transfers an output request output from a device connected to the device to the reception unit, and transfers a file output from the output unit to the device. The receiver according to item. A file caching method using a receiver,
The broadcast receiving unit receives broadcast waves from the broadcast sending device,
The file extraction unit extracts a file associated with the URI from the broadcast wave received by the broadcast reception unit,
The recording unit records the file extracted by the file extraction unit in the storage unit in association with the URI,
The accepting unit accepts an output request for the file indicated by the URI,
The determination unit determines whether a file associated with the URI received by the reception unit is stored in the storage unit,
The file acquisition unit acquires the file from the storage unit when the determination unit determines that the file associated with the URI is recorded in the storage unit, and the file associated with the URI is When it is determined that the file is not recorded in the storage unit, the file is acquired from the network,
The file caching method, wherein the output unit outputs the file acquired by the file acquisition unit. Receiver
A broadcast receiver for receiving broadcast waves from a broadcast transmitter;
A file extraction unit for extracting a file associated with a URI from a broadcast wave received by the broadcast reception unit;
A recording unit that records the file extracted by the file extraction unit in the storage unit in association with the URI;
A reception unit for receiving an output request for a file indicated by the URI;
A determination unit that determines whether a file associated with the URI received by the reception unit is stored in the storage unit;
When the determination unit determines that the file associated with the URI is recorded in the storage unit, the file is acquired from the storage unit, and the file associated with the URI is recorded in the storage unit. A file acquisition unit that acquires the file from the network when it is determined that
A program for causing the file acquisition unit to function as an output unit that outputs a file acquired.

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