JP2005167564A - Content processing apparatus, content processing method, and content processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To process a content in real time with an inexpensive configuration. <P>SOLUTION: The content processing apparatus for receiving content included in multiplexed streams and processing the received content includes: a data extract means for extracting a data part of a processing object from the content: a data processing means for processing message data included in the data part obtained by the data extract means on the basis of preset processing content; and a data multiplexer means for replacing the processing data obtained by the data processing means with the data part obtained from the data extract means and multiplexing and outputting the replaced content to solve the task above. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a content processing device, a content processing method, and a content processing program, and more particularly to a content processing device, a content processing method, and a content processing program for efficiently processing content with an inexpensive configuration.

  In BS (Broadcasting Satellite) digital broadcasting, which started broadcasting in December 2000, and terrestrial digital broadcasting scheduled to start broadcasting in 2003, video and audio provided by conventional analog broadcasting are simply digital. Information such as data, subtitles, character supermarkets, etc. is newly provided.

  Here, the video provided to the viewer is compressed in accordance with a compression method according to the ISO / IEC 13818-2 (MPEG-2 Video) standard, and the audio is ISO / IEC 13818-7 (MPEG-2 Advanced Audio Coding, AAC). It is compressed according to the compression method according to the standard. In addition, information such as data, captions, and character superscripts is described and encoded according to the ARIB STD-B24 (data encoding method and transmission method in digital broadcasting) standard.

  In addition, individual monomedia represented by video, audio, data, subtitles, superimpose of characters, etc. is encoded for each monomedia by a method based on the above-mentioned standard, and ISO / IEC13818-1 (MPEG-2). After being multiplexed in a transport stream (TS) format described in Systems), it is digitally modulated and provided to each home as a broadcast signal.

  By the way, with a television apparatus that only supports conventional analog broadcasting, it is not possible to view programs (contents) broadcast on BS digital broadcasting or terrestrial digital broadcasting as they are. When viewing these digital broadcasts, in order to demodulate the digitally broadcast signal, separate the multiplexed content into mono media such as video and audio, and further decode and display the individual mono media Digital broadcast receiver is required.

  In order to view a digital broadcast program, a digital broadcast receiver is connected to an analog-compatible television device or a television device compatible with digital broadcasting is used. The digital broadcast receiver is provided with IEEE-1394 as an interface for connecting to a device having a function not provided in the digital broadcast receiver.

  For example, in a situation where the digital broadcast receiver does not have a function for storing broadcast program content, and if it is desired to store received content, a device for storing content corresponding to the IEEE-1394 interface connection is prepared separately. By connecting to the digital receiver through the IEEE-1394 interface, not only can the content of the broadcast program be viewed in real time, but the content can be stored and the stored content can be viewed later.

  In addition, the display content of content displayed by a display device or the like can be controlled using BML (Broadcast Markup Language) used as a language for describing digital broadcast data. Furthermore, since the command for controlling the telephone line is prepared in BML, the BML that issues the control command is created and sent to the digital receiver via the telephone line equipped in the digital broadcasting receiver. The device can be controlled (see, for example, Patent Document 1).

  Here, a schematic configuration on the receiving apparatus side will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of a device configuration on the digital broadcast receiving side.

  FIG. 1 shows a BS digital broadcast reception antenna 11, a terrestrial digital broadcast reception antenna 12, a communication network 13, a content storage device 14, a content acquisition device 15, a digital broadcast receiver 16, a remote controller 17, and a display. And a device 18.

  In FIG. 1, a BS digital broadcast receiving antenna 11 receives a BS digital broadcast stream, and a terrestrial digital broadcast receiving antenna 12 receives a terrestrial digital broadcast stream.

  The content acquisition device 15 is connected to the BS digital broadcast reception antenna 11, the terrestrial digital broadcast reception antenna 12, the communication network 13, and the content storage device 14, and further via an IEEE-1394 interface connection function or a telephone line. The digital broadcast receiver 16 is connected. In addition, the content acquisition device 15 may include all or one of the currently broadcast content included in the stream received from the antenna, the content stored in the content storage device 14, and the content streamed via the communication network 13. Get a department.

The digital broadcast receiver 16 wants to view content that is currently being broadcast included in the stream received from the antenna, content stored in the content storage device 14, or content that is streamed via the communication network 13. By selecting and outputting to the display device 18, the viewer can view the content. Note that the processing as described above can be controlled by individual component devices, and can also be controlled using the remote controller 17.
JP 2003-319310 A

  By the way, in the receiving side apparatus configuration as shown in FIG. 1, it is necessary to rewrite the BML or the like of the content included in the stream in order to control the display content or the like of the received content as described above. At this time, conventionally, the BML data is not affected on the data already multiplexed in the MPEG-2TS format without affecting the data other than the BML data to be rewritten and the data of other monomedia included in the stream. In order to rewrite data, a device that separates the streams multiplexed before and after the data rewriting device into mono media in real time and a device that multiplexes mono media in real time are required. However, these devices are provided with dedicated hardware and are expensive.

  Since the digital broadcast program is encoded in the MPEG-2TS format, the digital broadcast program is all divided into 188-byte packets and transmitted. Here, if BML is added to perform the control as described above, the number of packets increases compared to the original digital broadcast program. At this time, if the process of simply adding the increased packets to the original digital broadcast program is performed, PTS (Presentation Time Stamp), DTS (Decoding Time Stamp), PCR ( There is a possibility that time stamp information such as Program Clock Reference) will be distorted, and video, audio, etc. cannot be reproduced normally. For this reason, since processing for rewriting these time stamp information is newly required, the processing becomes complicated and content processing cannot be performed efficiently.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a content processing apparatus, a content processing method, and a content processing program for efficiently processing content with an inexpensive configuration.

  In order to solve the above problems, the present invention employs means for solving the problems having the following characteristics.

  According to a first aspect of the present invention, there is provided a content processing apparatus that receives content included in a multiplexed stream and processes the received content, and a data extraction unit that extracts a data portion to be processed from the content; , Data processing means for processing the message data included in the data portion obtained by the data extraction means based on preset processing content, and processing data obtained by the data processing means can be obtained by the data extraction means. And a data multiplexing means for multiplexing and outputting the replaced content.

  According to the first aspect of the present invention, content processing can be efficiently performed with an inexpensive configuration. In other words, by extracting and replacing only the packet of the target data portion, the packet is not added, so that the time stamp information included in the stream is not distorted, and the processing is not complicated. Content processing can be performed.

  In the invention described in claim 2, the data extraction means extracts PSI, SI, or content transmitted by a data carousel method from an MPEG-2 transport stream, and the PSI, SI, or content Only the changed part is extracted from the content.

  According to the second aspect of the present invention, output is performed only when the content of PSI, SI, or content changes, so that content processing of the data extraction means can be reduced.

  According to a third aspect of the present invention, the data processing means restores a data module from the data content obtained by the data extraction means, and processes the data module based on preset processing contents. And message updating means for updating the PSI corresponding to the data module processed by the data module processing means.

  According to the third aspect of the present invention, the data module obtained by the data extracting means can be instantaneously processed based on preset processing content and output in the data module format.

  According to a fourth aspect of the present invention, there is provided a content processing apparatus that receives an MPEG-2 transport stream having digital broadcast program content transmitted by a data carousel method, and processes the content from the received transport stream. Data extraction means for extracting a packet from a packet group included in the transport stream based on a service ID and a component tag value; data processing means for processing data based on preset processing content; and the data processing Data multiplexing means that packetizes the data obtained by the means, replaces it with a packet obtained by the data extraction means, a null packet, or a packet deleted by partialization, and multiplexes and outputs the replaced packet. To.

  According to the fourth aspect of the present invention, it is possible to realize content processing for efficiently processing content with an inexpensive configuration. As a result, not only simple rewriting of BML data, but also data processing or addition of data can be performed on small data such as event messages, subtitles, and character superscripts included in digital broadcast programs.

  In the invention described in claim 5, when the data content is not included in the transport stream, the data extraction unit selects one packet ID that is not used in the transport stream, and the data processing unit Is characterized in that the packet ID is registered in the PMT in a data packet processed based on preset processing content.

  According to the fifth aspect of the present invention, it is possible to register data content, subtitle super, and the like newly added to the transport stream as a part of the broadcast program.

  According to a sixth aspect of the present invention, when the data multiplexing unit replaces a data packet obtained by the data processing unit with a packet obtained by the data extraction unit, the contents of packets other than the processing target packet are changed. It is characterized by replacing without doing.

  According to the sixth aspect of the present invention, even when the data amount of the data packet obtained by the data processing means is different from the data amount of the original data packet, the carousel period of the same packet sent multiple times by the data carousel method is changed and replaced. Thus, it is possible to realize efficient content processing without changing other parts of the transport stream.

  The invention described in claim 7 is a content processing method for receiving content contained in a multiplexed stream and processing the received content, and a data extraction step of extracting a data portion to be processed from the content; A data processing stage for processing message data included in the data portion obtained by the data extraction stage based on preset processing content, and a processing data obtained by the data processing stage can be obtained by the data extraction stage. And a data multiplexing stage for multiplexing and outputting the replaced content.

  According to the seventh aspect of the present invention, it is possible to realize content processing for performing content processing in real time with an inexpensive configuration. In other words, since only the target data portion is extracted and replaced, the time stamp information included in the stream is not distorted and the processing is not complicated, so that content processing can be performed efficiently.

  In the content processing program for receiving the content included in the multiplexed stream and causing the computer to process the received content, the data portion to be processed is extracted from the content. Data processing for processing, data processing for processing message data included in a data portion obtained by the data extraction processing based on preset processing content, and processing data obtained by the data processing processing, The data portion obtained by the extraction process is replaced, and the data multiplexing process for multiplexing and outputting the replaced content is executed by a computer.

  According to the invention described in claim 8, content processing can be realized in real time with an inexpensive configuration. In other words, since only the target data portion is extracted and replaced, the time stamp information included in the stream is not distorted and the processing is not complicated, so that content processing can be performed efficiently. Moreover, content processing can be easily realized by installing an execution program in a computer.

  According to the present invention, content processing can be realized in real time with an inexpensive configuration.

  Hereinafter, a preferred embodiment of a content processing apparatus, a content processing method, and a content processing program according to the present invention having the above-described features will be described in detail with reference to the drawings. In the present embodiment, the device configuration shown in FIG. 1 is used, and the content acquisition device 15 is provided with a functional configuration for processing and outputting a part of the content encoded in the MPEG-2TS format. Will be described. Note that a functional configuration to be described later is not limited to the content acquisition device 15 and may be provided in the digital broadcast receiver 16, for example.

  FIG. 2 is a diagram illustrating an example of a functional configuration of a content processing device provided in the content acquisition device. In FIG. 2, the content processing device 20 is configured to include data extraction means 21, data processing means 22, and data multiplexing means 23.

  In FIG. 2, the data extraction means 21 extracts a data portion to be processed from the content in the input digital broadcast stream in the MPEG-2TS format. The data processing unit 22 processes the data based on the data processing content set in advance for the data portion extracted by the data extraction unit 21. The data multiplexing unit 23 replaces the data part in the digital broadcast program received from the data extraction unit 21 with the data processed by the data processing unit 22 and outputs the data.

  By providing the functions described above, real-time processing of part of digital broadcast program content can be performed by software processing in accordance with the intentions of users such as content providers and broadcast stations, even without a separation device or multiplexing device. realizable.

  Further, in the present invention, the digital broadcast program input to the content acquisition device 15 and the number of packets of the output thereof are not changed, so that time stamp information such as PCR, PTS, and DTS included in the stream is changed. The content can be processed without changing the content.

  Next, how the input stream is processed in the content processing apparatus 20 will be described with reference to FIGS. Note that the stream shown here uses a DSM-CC (Digital Storage Media Command and Control) download carousel transmission system defined in ISO / IEC 13818-6 that repeatedly transmits broadcast data.

FIG. 3 is a diagram illustrating an example of a content processing procedure when a data packet is included in the input stream. In FIG. 3, the data portion packet (D ₀ , D ₁ , D ₂ in FIG. 3) exists in the input digital broadcast program stream 31. When there is a data packet in this way, the data extraction means 21 extracts the packet of the data part of the digital broadcast program stream 31 and reconstructs the data 32 (D in FIG. 3).

  The data processing means 22 creates additional data 33 for controlling a device such as a content acquisition device. Further, the reconstructed data 32 and the created additional data 33 are synthesized and created as new data 34 (D ′ in FIG. 3).

The data multiplexing means 23 again converts this data 34 into a packet according to the MPEG-2TS format (in FIG. 3, D ₀ ′, D ₁ ′, D ₂ ′, D ₃ ′). Here, the converted packet 35 is held in the data multiplexing means 23 or the like, and only the updated data portion is reconstructed, combined, and packetized each time the data is updated in the digital broadcast program. Further, the data multiplexing unit 23 replaces the packetized data 35 with the packet portion of the original stream, and creates a new stream 36. Further, the data multiplexing means 23 outputs the created stream 36 to the digital broadcast receiver 16 connected by the IEEE-1394 interface. The output stream 36 is decoded by the digital broadcast receiver 16 and displayed to the viewer on the display device 18.

  By the way, as shown in FIG. 3, when the total capacity of the combined data portion is larger than the total capacity of the original data portion, the number of data packets to be replaced increases, so that the data repeatedly output by the carousel transmission method The cycle becomes longer. Further, when the total capacity of the combined data portion is smaller than the total capacity of the original data, the cycle of data repeatedly output by the carousel transmission method is shortened. However, since the other parts in the stream are the same as the original stream, the content can be processed and provided to the viewer without causing any error in the time stamp information such as PCR, PTS, and DTS. .

  Here, there is a case where the data portion packet does not exist in the received digital broadcast program stream. A content processing procedure to which the present invention is applied when there is no data portion packet in the next input digital broadcast program will be described with reference to the drawings.

  FIG. 4 is a diagram illustrating an example of a content processing procedure when a data packet is not included in the input stream. As shown in FIG. 4, when there is no data portion packet in the input digital broadcast program 41, first, the content extraction unit 21 extracts a packet including a PMT (Program Map Table) from the digital broadcast program stream. Next, a packet ID that is not currently used is selected from the extracted PMT, and this information is added to the PMT as a packet ID for data to which this ID is added. The changed PMT is packetized again and replaced with the original PMT packet.

The data processing means 22 creates data 42 (D ′ in FIG. 4) for controlling the content acquisition device and the like. Further, the data multiplexing means 23 converts this data into a packet 43 (D ₀ ′, D ₁ ′ in FIG. 4) according to the MPEG-2TS format, and assigns the packet ID. In addition, the data multiplexing unit 23 creates a stream 44 in which the packet 43 is replaced with a packet determined to be unnecessary or redundant in configuring the broadcast program, such as a null packet (N in FIG. 4) in the digital broadcast program stream. And output to the digital broadcast receiver 16 connected through the IEEE-1394 interface. The output stream 44 is decoded by the digital broadcast receiver 16 and displayed to the viewer on the display device 18.

  Further, as a method other than the above, there is a method of replacing a packet portion deleted by partialization. Here, “partialization” means that, when a broadcast signal of a frequency channel including a TS of a program desired by a certain viewer is received, a packet of the program desired by the viewer is extracted from the received broadcast signal. . In other words, because the viewer does not want. Packet replacement is performed using a packet portion that is deleted by partialization.

  By using these methods, regardless of whether or not the data portion is present in the acquired digital broadcast program stream, the content can be processed from the original digital broadcast program stream and output without changing the transmission rate. Real-time processing by software or the like can be realized.

  Next, a specific apparatus configuration included in each component unit illustrated in FIG. 2 will be described with reference to the drawings.

  Here, the data in this embodiment is expressed in units of resources consisting of files such as BML documents, still images, graphics, etc., and these resources are organized in units called modules. This module is divided into fine blocks called DDB (Download Data Block) messages and transmitted in the MPEG-2TS format according to the DSM-CC carousel transmission system.

  Further, a DII (Download Info Indication) message is used to indicate the configuration of modules transmitted by the same PID in one TS. An ID is assigned to each DDB, and module information such as the module ID and module size existing in the PID is written in the DII. The DII is like directory information in a computer. . By comparing the information written in the DII with the transmitted DDB, it is possible to confirm whether the DDB is correctly transmitted.

  Further, the above-described module can also be zlib compressed and transmitted in order to increase data transmission efficiency. In this case, the presence or absence of compression can be determined by placing a “Compression Type” descriptor in DII.

<Data extraction means>
FIG. 5 is a diagram showing an example of a specific configuration of the data extraction means in the present invention. 5 includes an MPEG-2TS input buffer 51, a packet distribution unit 52, a stream discontinuity detection unit 53, a PAT table restoration unit 54, a PMT table restoration unit 55, and a PMT message restoration unit. 56, a data table restoring unit 57, a DII message restoring unit 58, a DDB message restoring unit 59, an event message restoring unit 60, and a message sending unit 61.

  The data extracting means 21 shown in FIG. 5 extracts the data specified by the service ID to be processed and the component tag from the input digital broadcast program stream in the MPEG-2TS format. In order to reduce the processing amount in the data multiplexing means 23, the data is sent to the data processing unit 22 only when the extracted data is updated.

  The input MPEG-2TS format digital broadcast program is stored in the MPEG-2TS input buffer 51. The MPEG-2TS input buffer 51 has a memory that can store hundreds to thousands of packets, and variations in the input speed of the stream to which the MPEG-2TS input buffer 51 is input and the output speed of the output stream are varied. There is a role to absorb.

  Here, the packet length in the MPEG-2TS format is a fixed length of 188 bytes, and is composed of one or both of a 4-byte packet header, an adaptation field, and a payload.

  The packet distribution unit 52 holds a PMT_PID that is a PID (packet ID) of the PMT and a Data_PID that is a PID of data, and each of the PMT_PID and the Data_PID is a set of zero or more PIDs. The packet distribution unit 52 monitors the PID described in the header of the input TS packet. If the PID is “0” indicating a PAT (Program Association Table), the packet distribution unit 52 outputs the PID to the PAT table restoration unit 54. To do. If the PID matches one of the PMT_PIDs, it is output to the PMT table restoration unit 55. If it matches one of Data_PID, it is output to the data table restoration unit 57, and packets in the stream are sequentially distributed in this way.

  Further, the packet distribution unit 52 basically sets a PID for data when the stream is not processed but the Data_PID does not exist. In this case, the PID of the null packet is changed to a PID for new data. Based on the PID changed in this process, the data multiplexing means 23 replaces the packet.

  Here, FIG. 6 shows the relationship between the above-described table and TS packets and sections. Note that PSI (Program Specific Information) data such as PAT and PMT is stored in accordance with the data structure of a table defined by ISO / IEC13818-1. In addition, as a data structure of a table similar to PSI, there is SI (Service Information) which is service-specific information such as program information.

  The table 62 is composed of one or more sections 63-1 to 63-n. A section header 64 is given to the head of each section 63, and a CRC (Cyclic Redundancy Code) 65 is given to the end of the section 63, respectively. Has been.

  The section 63 is stored in the payload portion 67 of one or more TS packets 66. That is, a section exceeding the size of the payload portion 67 of the packet 66 is divided into a plurality of payloads 67 of the TS packet 66 and stored.

  In FIG. 5 again, the PAT table restoration unit 54, the PMT table restoration unit 55, and the data table restoration unit 57 extract only the payload portion of the TS packet as shown in FIG. 6, and restore the section included in the payload. To do.

  Since there is also section length information in the section header, this section length is compared with the length of the restored section, and the length of the restored section is the section length described in the section header. Hold until. When the section length described in the section header is reached, error detection is performed with a 32-bit CRC attached to the end of the section. Here, if an error is detected, the section is discarded.

  The sections restored by the above method are collected for each table ID and held as a table. In the initial state, nothing is held in the table. For example, except for an event message whose table ID is “0x3D”, in order to reduce the load by omitting subsequent processing, whether or not the section information is updated every time the section is restored is determined. to decide.

  As a result of the determination, the section is replaced only when it is updated and the table is reconfigured. Then, the PMT whose table ID is “0x02” is sent to the PMT message restoration unit 56. Similarly, the table with the table ID “0x3B” is sent to the DII message restoration unit 58, and the table with the table ID “0x3C” is sent to the DDB message restoration unit 59.

  Note that the version information of the section described in the section header is used to determine whether or not the section information has been updated. For example, the version numbers of the restored table section and the previously sent section are compared, and if the version information does not match, it is determined that the section has been updated.

  Furthermore, only the event message whose table ID is “0x3D” is sent to the event message restoration unit 60 even if the section is not updated.

  Here, since the initial values of PMT_PID and Data_PID held in the packet allocating unit 52 are not set, the packet allocating unit 52 initially only includes a packet including a PAT whose PID is “0”. And a packet with a PID of “0” is output to the PAT table restoration unit 54. The PAT table restoration unit 54 restores the output PAT. The PAT describes the PMT PID for each service ID. When one or more service IDs are separately provided, the PMT PID corresponding to the service ID is obtained. The PID is output to the packet distribution unit 52.

  The packet sorting unit 52 registers the PID input from the PAT table restoring unit 54 in the PMT_PID in the packet sorting unit 52. As a result, the PMT is also monitored by the packet distribution unit 52. The packet distribution unit 52 selects the PMT and sends it to the PMT table restoration unit 55, which restores the PMT.

  Here, in the PMT, the stream types of all the streams constituting the program and the corresponding PID are registered. In addition, component tags for each stream may be registered. In addition, since the stream type of the data portion is defined as “0x0D”, the PID to be processed can be obtained from the stream type and the value of the component tag designated as the data processing target. This PID is sent to the packet sorting unit 52 and registered in Data_PID in the packet sorting unit 52.

  The stream discontinuity detection unit 53 receives the MPEG-2TS stream output from the packet distribution unit 52, and detects a DIT (Discontinuity Information Table) in the stream, the packet distribution unit 52, the PAT table restoration unit 54 The reset flag is output to the PMT table restoration unit 55 and the data table restoration unit 57.

  When receiving the reset flag, the packet allocating unit 52 deletes the contents of PMT_PID and Data_PID in the packet allocating unit 52. Further, when receiving the reset flag, the PAT table restoration unit 54, the PMT table restoration unit 55, and the data table restoration unit 57 delete the tables held by them. The stream discontinuity detection unit 53 does not process the stream.

  When all sections constituting the table as shown in FIG. 6 are input, the PMT message restoration unit 56 removes the section header part and the CRC, restores the PMT message data, and obtains the message ID, message data, Is sent to the message sending unit 61-1. Here, the message ID is an ID generated based on the PID of the PMT, the table ID, and the service ID.

  The DII message restoration unit 58 removes the section header part and the CRC after all the sections constituting the table are gathered, and then sends the message based on the User-to-Network download protocol defined in ISO / IEC13818-6. The DII message data is restored by removing the header and the like, and the message ID and message data are sent to the message sending unit 61-2.

  Here, the message ID is an ID generated based on the PID of the DII, the table ID, and the download ID defined in the DII.

  The DDB message restoration unit 59 removes the section header and CRC after all sections constituting the table are gathered, and then, based on the User-to-Network download protocol defined in the ISO / IEC 13186-6 standard. The message header and the like are removed to restore the DDB message data, and the message ID and message data are sent to the message sending unit 61-2.

  Here, the message ID is an ID generated based on the PID of the DDB, the table ID, and the module ID defined in the DDB.

  When all the sections constituting the table are input, the event message restoration unit 60 removes the section header and CRC, and then removes the message header and the like based on the ARIB STD-B24 standard. Data is sent out, and the message ID and message data are output to the message sending unit 61-2. Here, the message ID is an ID generated based on the PID of the event message, the table ID, the data event ID defined in the event message, and the event message group ID.

  The message sending units 61-1 and 61-2 send the message ID and message data to the message receiving unit of the data processing unit 22 described later.

<Data processing means>
Next, a specific configuration of the data processing means in the present invention will be described with reference to the drawings. FIG. 7 is a diagram showing an example of a specific configuration of the data processing means in the present invention. 7 is configured to include a message receiving unit 71, a data module processing unit 72, a message updating unit 73, and a message sending unit 74.

  The data processing means 22 processes the data received from the data extraction means 21 based on a data processing method designated in advance. The message receiving unit 71-1 outputs the message data input from the message sending unit 61-1 to the message updating unit 73. The message receiving unit 71-1 compares the message ID received from the message sending unit 61-2 with the preset processing target message ID 75 among the message data input from the message sending unit 61-1. As a result of the comparison, a message corresponding to the matched message ID is output to the data module processing unit 72, and other messages are output to the message sending unit 74-2.

  First, when the message data input from the message receiving unit 71-2 is compressed based on RFC1950 (ZLIB Compressed Data Format Version 3.3) standard, the data module processing unit 72 receives the input message. Decompress the data and restore the data module.

  Thereafter, the data module is processed based on the processing details of the content preset by the processing method parameter 76. For example, the display device or the like processes (describes) BML or the like for controlling the display content of the device. Further, when the data amount of the data module is large, the data is compressed based on the RFC1950 standard as necessary and sent to the message sending unit 74-2.

  In addition, when a new data module is input, the data module processing unit 72 can also assign a new PID to the data module. In this case, the assigned PID is sent to the message update unit 73.

  When the PID is input from the data module processing unit 72, the message updating unit 73 additionally registers the PID with the PID input from the message receiving unit 71-1, based on the ISO / IEC13818-1 standard, and then the message sending unit. It outputs to 74-1. The message sending units 74-1 and 74-2 output the input message ID and message to the multiplexing unit 23.

<Data multiplexing means>
Next, a specific configuration of the data multiplexing means in the present invention will be described with reference to the drawings. FIG. 8 is an example of a specific configuration of the data multiplexing means in the present invention. 8 includes a message accepting unit 81, a PMT table reconstruction unit 82, a PMT packet generation unit 83, a DII table reconstruction unit 84, a DDB table reconstruction unit 85, and an event table reconstruction. Unit 86, data carousel generation unit 87, packet replacement unit 88, and MPEG-2TS output buffer 89.

  The message receiving units 81-1 and 81-2 input a message ID and message data from the message sending units 74-1 and 74-2, respectively.

  The message receiving unit 81 distributes the message to the PMT table reconstruction unit 82, the DII table reconstruction unit 84, the DDB table reconstruction unit 85, and the event table reconstruction unit 86 on the basis of the input message ID. An ID and a message are output.

  The PMT table reconstruction unit 82 adds a section header defined by the ISO / IEC13818-1 standard to the PMT message data input from the message receiving unit 81-1, based on the message ID. Here, the version number in the section header is a value obtained by adding 1 to the version number given to the previously received PMT message data. Further, a 32-bit CRC defined by the ISO / IEC13818-1 standard is added.

  That is, each time a PMT message is newly input from the message receiving unit 81-1, the PMT table reconstructing unit 82 adds 1 to the version number and then determines the section header defined by the ISO / IEC13818-1 standard. And a 32-bit CRC. Further, the PMT table reconstruction unit 82 outputs the generated section to the PMT packet generation unit 83.

  The DII table reconstruction unit 84 determines whether the type corresponds to DII based on the table ID included in the acquired message, and stores the DII based on the acquired message when the type corresponds to DII. . Further, 1 is added to the transaction ID corresponding to the version number of DII, a DII header is added, and the data is output to the data carousel generation unit 87. In addition, the DII table reconstruction unit 84 also checks whether there is a temporarily stored DDB. If the DDB is stored, the DII table reconstruction unit 85 sends the DII to the DDB table reconstruction unit 85 as a data carousel generation unit 87. Instruct to send to.

  The DDB table reconstruction unit 85 temporarily stores the DDB based on the table ID included in the acquired message, further divides the DDB, adds a DDB header, and the like, and then sends the DDB to the data carousel generation unit 87. Output. However, if the DII does not yet exist or if the registered content of the DII and the DDB do not match, the data is temporarily stored without being output to the data carousel generator 87.

  Both the DII table configuration unit 84 and the DDB table configuration unit 85 exchange data. Specific processing contents will be described later.

  The event table reconstruction unit 86 adds a message header and a section header defined by the ARIB STD-B24 standard based on the message ID to the event message data received from the message receiving unit 81-2. After that, a 32-bit CRC defined by the ISO / IEC13818-1 standard is added. Thereafter, the event table reconstruction unit 86 outputs the event message data to the data carousel generation unit 87.

  The PMT packet generation unit 83 converts the section obtained by the PMT table reconstruction unit 82 into one or more 188-byte packets according to the ISO / IEC13818-1 standard, and outputs the packet to the packet replacement unit 88 To do.

  The data carousel generation unit 87 converts the sections obtained from the DII table reconstruction unit 84, the DDB table reconstruction unit 85, and the event message reconstruction unit 86 into one or more 188 bytes according to the ISO / IEC13818-1 standard. And a number is assigned to all the converted packets.

  When a section is updated, all the packets that make up the pre-update section are deleted. In addition, packets converted after the update are added, and new numbers are assigned to these packets. The data carousel generating unit 87 sequentially sends packets to the packet replacing unit 88 according to a procedure predetermined by the data carousel generating unit 87 with the number assigned to the packet.

  The packet replacement unit 88 monitors all the PIDs of the stream received from the stream discontinuity detection unit 53, and the PID of the packet input from the PMT packet generation unit 83 and the data carousel generation unit 87 is the PID of the stream packet. If they match, the packet parts are sequentially replaced with the packet parts input from the PMT packet generator 83 and the data carousel generator 87 and output to the MPEG-2TS output buffer 89.

  The MPEG-2TS output buffer 89 has a memory that can store, for example, several hundred to several thousand packets, and variations in the input speed of the stream input to the MPEG-2TS output buffer 89 and the output speed of the output stream. Has a role to absorb.

  Thereby, it is possible to easily and quickly process a part of the content of the digital broadcast program in accordance with the processing parameters set by the content provider or a user such as a broadcasting station. Further, in the present invention, by providing the device configuration described above in the content acquisition device 15, it is not necessary to provide a configuration such as a separation device or a multiplexing device on the receiving side, and a content processing device can be provided with an inexpensive device configuration. it can.

  Here, the operation performed between the above-described DII table reconstruction unit 84 and the DDB table reconstruction unit 85 will be described in detail using a flowchart. FIG. 9 is a flowchart illustrating an example of operations performed between the DII table reconstruction unit and the DDB table reconstruction unit.

  First, a message and a message ID are acquired (S01). At this time, the table ID is restored from the acquired message ID (S01). Next, it is determined whether the message is DII or DDB based on the restored table ID (S02). Specifically, it is determined whether the table ID of the DDB is “0x3C”. If it is “0x3C” (YES in S02), it is determined to be DDB, and the DDB table reconstruction unit 85 performs the processing after S09. Do. If the table ID is not “0x3C” (NO in S02), the restored data is output to the DII table reconstruction unit 84.

  The DII table reconstruction unit 84 determines whether the table ID input from the DDB table reconstruction unit 85 is DII (S03). Specifically, it is determined whether the table ID of DII is “0x3B”. If it is “0x3B” (YES in S03), the DII message is stored (S04). Here, the stored DII message is referred to from the DDB table reconstruction unit 85. The version number of DII is managed by the transaction ID, and each time a new DII message arrives, the transaction ID is incremented by one (S05). Furthermore, this transaction ID is recorded in the message header of DII.

  Thereafter, with respect to the message data received from the message receiving unit 81-2, the DII message header defined by ARIB STD-B24 based on the message ID, the section header defined by the ISO / IEC13818-1 standard, and 32 A bit CRC is added (S06).

  Here, the DII table reconstruction unit 84 outputs the DII to which the DII header is assigned to the data carousel generation unit 87 (S07).

  Further, the DII table reconstruction unit 84 determines whether there is a temporarily stored DDB (S08). At this time, the DDB table reconstruction unit 85 is referred to, and it is determined whether there is a stored DDB by the process of S10 described later. If there is a temporarily stored DDB (YES in S08), the data is output to data carousel generating unit 87. Also, if the DDB does not exist (NO in S08), or if it is not “0x3B” in S03 (NO in S03), the process ends without doing anything and the next message is acquired. wait.

  When the table ID is “0x3C” in S02 (YES in S02), the DDB table reconstruction unit 85 determines whether a DII message exists in the DDI table reconstruction unit 84 by the process in S04 (S09). . If the DII message does not yet exist (save) (NO in S09), the input DDB message is temporarily saved (S10).

  If the DII message already exists (YES in S09), it is determined whether the DDB message is registered in the DII message (S11). If it is registered in the DII message (YES in S11), it is further determined whether the DDB message matches the content of the DDB message registered in the DII message (S13).

  Here, the registered DDB contents indicate information such as a module number, a module size, and a module version number, and these information can be restored from the DDB message and the DDB message ID.

  If the DDB message is not registered in the DII message in S11 (NO in S11), the DDB message is additionally registered in the DII message (S12). If the DDB message does not match the registered content of the DII message in S13 (NO in S13), the registered content of the DDB message on the DII message is updated to the newly acquired DDB message (S14).

  After the process of S12 or the process of S14 is completed, the version number of DII is managed by the transaction ID, and the transaction ID is incremented by 1 (S15). In the process of S15, each time a new DII message arrives, the transaction ID is incremented by one and recorded in the message header of DII.

  Thereafter, for the DII message data received from the message receiving unit 81-2, a DII message header defined by the ARIB STD-B24 standard based on the message ID and a section defined by the ISO / IEC13818-1 standard. A header and a 32-bit CRC are added (S16). The DII to which the DII header is added is output to the data carousel generating unit 87 (S17).

  Next, if it matches the registered content of the DII message (YES in S13), if there is a DDB temporarily stored in S08 (YES in S08), the process of S10 or S17 ends. In this case, the DDB table reconstruction unit 85 divides the DDB message data so that it does not exceed 4066 bytes, and is defined in the ARIB STD-B24 standard based on the message ID for all the divided DDB message data. The DDB message header, the section header defined by the ISO / IEC13818-1 standard, and the 32-bit CRC are added (S18). Thereafter, the DDB message obtained by the process of S18 is sent to the data carousel generator 87 (S19).

  As described above, by exchanging (referring) data between the DII table configuration unit 84 and the DDB table configuration unit 85, a message can be efficiently generated and output.

  Here, as described above, an execution program (content processing program) capable of causing a computer to execute functions in the content processing apparatus can be generated and provided as software.

  Here, an outline of a data processing procedure realized by software will be described with reference to a flowchart. FIG. 10 is a flowchart of an example showing a data processing procedure in the present invention.

  First, a DDB message to be processed is acquired from the message receiving unit 71-2 (S21). The data amount of the DDB message is about several hundred bytes to several hundred kilobytes, and messages other than short messages of several hundred bytes are usually compressed by the zlib method defined in RFC1950.

  Next, it is determined whether or not the DDB message is compressed in the zllb format (S22). This determination can be made based on whether or not the “Compression Type” descriptor is arranged in the DII as described above. If compressed in the zlib format (YES in S22), the message is decompressed (S23).

  Here, the DDB message is in a module format in a system defined by ARIB STD-B24. Therefore, after the processing of S23 or when the message is not compressed in S22 (NO in S22), the message in the module format is expanded into a file (S24), and then a preset processing is performed. The file is processed based on the method parameter (S25). Note that the contents of the above-described parameters may be that a new file is added or a part of the file expanded in the process of S24 is deleted. Next, all the files expanded in the process of S24 including the files processed in S25 are converted again into the module format (S26).

  Next, it is determined whether message compression is necessary (S27). In this determination, it is determined whether the data amount of the module generated in S26 is larger or smaller than a preset data amount, and if it is larger, it is determined that compression is necessary. As another method, it is possible to determine whether compression is necessary unconditionally regardless of the amount of data, or whether compression is necessary depending on whether the compression is performed in the process of S22.

  If it is determined that the message needs to be compressed (YES in S27), the modularized message is compressed (S28). If message compression is not necessary (NO in S27), or after the process of S28 is completed, the message is output (S29).

  As described above, by installing the software according to the present invention, it is possible to efficiently process content. Further, by installing the execution program in the computer, it is possible to easily process the content using software.

  As described above, according to the present invention, content processing can be efficiently realized with an inexpensive configuration. By applying the present invention, the functions of the multiplexing device and the separation device are limited and added to the conventional device configuration, so that the content processing as described above can be realized by software on one computer. .

  In addition, if the present invention is used, not only rewriting BML data but also small data such as event messages, subtitles, and character superimposing, the above-described content processing can be realized after adding these data. Can do.

  In the above-described embodiment, the video and audio compression formats are described based on the MPEG2 compression format, but the same effect can be obtained by applying the present invention to, for example, MPEG4, MPEG7, and other compression methods. Can be obtained.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications, within the scope of the gist of the present invention described in the claims, It can be changed.

It is a figure which shows an example of an apparatus structure by the side of digital broadcasting reception. It is a figure of an example which shows the function structure of the content processing apparatus provided in a content acquisition apparatus. It is a figure of an example which shows the content processing procedure in case a data packet is contained in an input stream. It is an example of a content processing procedure when a data packet is not included in an input stream. It is a figure of an example which shows the concrete structure of the data extraction means in this invention. The relationship between a table and TS packets and sections is shown. It is a figure of an example which shows the concrete structure of the data processing means in this invention. It is a figure of an example which shows the concrete structure of the data multiplexing means in this invention. It is an example flowchart for demonstrating the operation | movement performed between a DII table reconstruction part and a DDB table reconstruction part. It is a flowchart of an example which shows the data processing procedure in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 BS digital broadcast receiving antenna 12 Terrestrial digital broadcast receiving antenna 13 Communication network 14 Content storage apparatus 15 Content acquisition apparatus 16 Digital broadcast receiver 17 Remote controller 18 Display apparatus 20 Data processing apparatus 21 Data extraction means 22 Data processing means 23 Data multiplexing means 51 MPEG-2TS input buffer 52 Packet distribution unit 53 Stream discontinuity detection unit 54 PAT table restoration unit 55 PMT table restoration unit 56 PMT message restoration unit 57 Data table restoration unit 58 DII message restoration unit 59 DDB message restoration unit 60 Event message Restoring unit 61, 74 Message sending unit 71, 81 Message receiving unit 72 Data module processing unit 73 Message updating unit 82 PMT table re-establishment Generating section 83 PMT packet generator 84 DII table reconstruction unit 85 DDB table reconstruction unit 86 event table reconstruction unit 87 data carousel generator 88 packet replacing unit 89 MPEG-2TS output buffer

Claims (8)

In a content processing apparatus that receives content included in a multiplexed stream and processes the received content,
Data extraction means for extracting a data portion to be processed from the content;
Data processing means for processing the message data included in the data portion obtained by the data extraction means based on preset processing content;
A content processing apparatus comprising: data multiplexing means for replacing the processed data obtained by the data processing means with a data portion obtained by the data extracting means, and multiplexing and outputting the replaced content. The data extraction means includes
2. The PSI, SI, or content transmitted by the data carousel method is extracted from an MPEG-2 transport stream, and only a changed portion is extracted from the content of the PSI, the SI, or the content. The content processing apparatus described in 1. The data processing means is
Data module processing means for restoring a data module from the data content obtained by the data extraction means, and processing the data module based on preset processing content;
The content processing apparatus according to claim 1, further comprising a message update unit that updates a PSI corresponding to the data module processed by the data module processing unit. In a content processing apparatus that receives an MPEG-2 transport stream having contents of a digital broadcast program transmitted by a data carousel method, and processes the content from the received transport stream,
Data extraction means for extracting packets from a packet group included in the transport stream based on a service ID and a component tag value;
Data processing means for processing data based on preset processing content;
Data multiplexing means for packetizing the data obtained by the data processing means, replacing it with a packet obtained by the data extracting means, a null packet, or a packet deleted by partialization, and multiplexing and outputting the replaced packet Content processing apparatus characterized by the above. The data extraction means selects one packet ID that is not used in the transport stream when data content is not included in the transport stream,
The content processing apparatus according to claim 4, wherein the data processing unit registers the packet ID in a PMT in a data packet processed based on preset processing content. The data multiplexing means includes
The data packet obtained by the data processing unit is replaced without changing the contents of the packet other than the processing target packet when the packet obtained by the data extraction unit is replaced. Content processing equipment. In a content processing method for receiving content included in a multiplexed stream and processing the received content,
A data extraction stage for extracting a data portion to be processed from the content;
A data processing step of processing the message data included in the data portion obtained by the data extraction step based on preset processing content;
A content processing method comprising: a data multiplexing step of replacing processed data obtained in the data processing step with a data portion obtained in the data extraction step, and multiplexing and outputting the replaced content. In a content processing program for receiving content included in a multiplexed stream and causing the computer to process the received content,
A data extraction process for extracting a data portion to be processed from the content;
Data processing processing for processing message data included in the data portion obtained by the data extraction processing based on preset processing content;
A content processing program for causing a computer to execute data multiplex processing for replacing processed data obtained by the data processing processing with a data portion obtained by the data extraction processing, and multiplexing and outputting the replaced content.

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