JP4742326B2 - Broadcast recording / playback apparatus and broadcast recording / playback processing program - Google Patents

Description

  The present invention relates to a broadcast recording / reproducing apparatus and a broadcast recording / reproducing processing program for recording and reproducing a digital broadcast including a data carousel type data broadcast.

In digital broadcasting, as shown in FIG. 9, video V, audio A, and data content D are all divided into packet units, and MPEG2-TS (hereinafter referred to as transport stream TS) defined in the ISO / IEC13818-1 standard. Are multiplexed and transmitted in a multiplexed stream format.
In the case of content linked to a program such as subtitles or text superimposing, the data content D that is data-broadcasted in the transport stream TS is compressed and encoded into the encoded bitstream ES in the same manner as the video V and audio A. Packetized in PES (Packetized Elementary Stream) format to which display time information is added later, but for storage service content such as weather forecasts and news, DMC-CC (Digital Storage Media-Command and Control) section Is packetized.

Data content D packetized in the DMC-CC section is data broadcast in a data carousel system. The data carousel method is a method in which the data content D is repeatedly transmitted so that the receiving side can acquire the necessary data content D even during the broadcast.
Specifically, as in the example illustrated in FIG. 10, the data content D includes a DII (Download Information Indication message) module that represents the attributes of each data module (still image data, graphic data, and character data), and each data. The module is converted into a DDB (Download Data Bloack) module divided in transmission size units, and these series of modules are repeatedly transmitted at predetermined intervals. The series of modules corresponding to the data content D is referred to as a carousel.

  As an apparatus for recording and reproducing digital broadcasts including such data carousel data broadcasts, for example, Patent Document 1 repeatedly transmits data broadcast data contents and video / audio streams separately. When only one of the data contents is recorded on the medium, and the next transmitted data contents are the same as the one recorded on the medium, only the transmission end time of the data contents is recorded on the medium as a time stamp. A technique for avoiding duplicate recording of transmitted data content is disclosed.

JP 2002-152688 A

By the way, in the apparatus disclosed in the above-mentioned patent document 1, although duplicate recording of data contents can be avoided, reproduction of data contents in consideration of the time stamp (transmission end time) recorded on the medium and the reproduction time of the video / audio stream. There is a problem that the timing needs to be controlled, and therefore, the process of reproducing the data broadcast is complicated.
This invention has such has been made in view of the circumstances, while allowing video and audio streams and synchronous reproduction without controlling the timing of the data content playback, corresponding to the data broadcast event message type It is an object of the present invention to provide a broadcast recording / reproducing apparatus and a broadcast recording / reproducing processing program that can be used.

According to the first aspect of the present invention, in a broadcast recording / reproducing apparatus that separates a transport stream into a video / audio stream and a data stream of a data broadcast and records and reproduces them separately, the data stream separated from the transport stream If the event message includes an event message, the event recording means for recording the event message on a recording medium, the first pointer indicating the recording position of the event message recorded on the medium by the event recording means, and the event message Data management information generating means for generating data management information including data to be represented, and recording the data management information generated by the data management information generating means on a recording medium, and outputting a second pointer indicating the recording position Data management information recording means for A video / audio recording means for adding a second pointer output from the data management information recording means to the recording medium, and recording it on a recording medium, and the video / audio recording means. Designated by pointer extraction means for reading a video / audio stream recorded on a recording medium and extracting a second pointer added to the read video / audio stream, and a second pointer extracted by the pointer extraction means The data management information is read from the recording medium, and the event message specified by the first pointer included in the data management information is read from the recording medium and played back.

According to a second aspect of the present invention, in a broadcast recording / reproducing processing program for separating a transport stream into a video / audio stream and a data broadcast data stream and recording / reproducing each separately, the data separated from the transport stream When an event message is included in the stream, an event recording process that records the event message on a recording medium, and a first pointer that represents the recording position of the event message recorded in the event recording process and the event message Data management information generation processing for generating data management information including data representing the data, and a second pointer for recording the data management information generated by the data management information generation processing on a recording medium and indicating the recording position Data management information recording process to output A video / audio recording process in which a second pointer output from the data management information recording process is added to a video / audio stream separated from the transport stream and recorded on a recording medium; and the video / audio recording process The video / audio stream recorded on the recording medium is read out, the second pointer added to the read video / audio stream is extracted, and the second pointer extracted by the pointer extraction process is designated. The data management information to be read is read from the recording medium, and a reproduction process for reading and reproducing the event message specified by the first pointer included in the data management information from the recording medium is executed by the computer.

According to the first and second aspects of the invention, when an event message is included in the data stream separated from the transport stream during recording, the event message is recorded on the recording medium, while the event message recorded on the medium is recorded. The data management information including the first pointer indicating the recording position of the data and the data indicating the event message is generated and recorded on the medium, and the second pointer indicating the recording position is separated from the transport stream. Added to the recorded video / audio stream and recorded on the medium.
At the time of reproduction, the second pointer added to the video / audio stream read from the recording medium is extracted, and the data management information specified by the extracted second pointer is read from the recording medium. since the event message specified by the first pointer reads and reproduced from a recording medium contained, while enabling reproduction video and audio streams and synchronization without controlling the timing of each data content playback, the event message type It can also support data broadcasting.

It is a block diagram which shows the structure of the broadcast recording / reproducing apparatus 10 by one Embodiment of this invention. It is a figure which shows the structure of the program stream PS output from the demultiplexer 101. FIG. It is a figure for demonstrating the version change of a carousel. It is a figure which shows an example in which the version change of the carousel of the data stream by which multiple system multiplexing was carried out. It is a figure for demonstrating the content of the data management information which the data recording control part 103 generate | occur | produces. It is a figure which shows the recording form of the data management information recorded on the recording medium 104, and a carousel (an event message is included). 4 is a flowchart showing an operation of a write control process executed by a data recording control unit 103. It is a figure which shows the data structure of a DMC-CC section format. It is a figure which shows the outline | summary of transport stream TS. It is a figure which shows the structure of a carousel.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a broadcast recording / reproducing apparatus 10 according to an embodiment of the present invention. The broadcast recording / reproducing apparatus 10 shown in this figure is roughly divided into a recording system 100 and a reproducing system 200. Hereinafter, the configuration and operation of each system will be described separately for the recording system 100 and the reproduction system 200.

(1) Configuration of Recording System 100 The recording system 100 includes a demultiplexer 101, a synchronization information adding unit 102, a data recording control unit 103, and a recording medium 104. The demultiplexer 101 separates, for example, a transport stream TS supplied from a tuner (not shown) into a video / audio stream and a data stream. When the video / audio stream is separated from the transport stream TS, the demultiplexer 101 performs type conversion to a program stream PS that includes one program in one stream.

Here, the configuration of the program stream PS will be described with reference to FIG. As shown in this figure, the program stream PS is formed of a plurality of packs P and a program end code EC representing the end of the stream. The pack P is composed of a pack header having a reference time SCR for performing reproduction synchronization, and a plurality of PES packets obtained by dividing the video / audio stream.
Further, the PES packet is formed of a PES packet header and a video (or audio) encoded bit stream ES. The PES packet header describes PES in which various control information such as time information (PTS and DTS) for specifying display / playback time is described in addition to a stream ID for identifying an individual stream (encoded bit stream ES) and a packet length. With header options.

The program stream PS (video / audio stream) having such a structure is supplied to the synchronization information adding unit 102. The synchronization information adding unit 102 adds the synchronization information to the program stream PS and outputs it. The synchronization information is information for synchronously reproducing data content when reproducing a program stream PS (video / audio stream) recorded on a medium. Specifically, it is a pointer indicating a recording position of data management information generated by the data recording control unit 103 described later, and will be described in detail later.
In the program information PS having the structure shown in FIG. 2, the synchronization information adding unit 102 sets “1” to the PES extension flag F1 in the PES header option described above to enable the PES extension field PEF, and further, the PES extension field. The PES private data flag F2 in the PEF is set to “1” to enable the PES private data field PDF, and a pointer (synchronization information) supplied from the data recording control unit 103 to be described later is used as the PES private data field. Store in PDF.

On the other hand, the data stream separated and extracted from the transport stream TS by the demultiplexer 101 is supplied to the data recording control unit 103. The data stream here refers to a series of carousels transmitted by the data carousel method described above. As shown in FIG. 3, the carousel is normally updated for each version section.
In the data recording control unit 103, a certain version of the carousel in the data stream supplied from the demultiplexer 101 is recorded on the recording medium 104 only once, and subsequent carousels are not recorded on the medium unless the version changes. Write control. In this way, duplicate recording of data content is avoided.

A data stream is often multiplexed in a plurality of systems. For example, as in the example illustrated in FIG. 4, when the data streams 1 and 2 are multiplexed, the data recording control unit 103 records a version of the carousel for each of the data streams 1 and 2 only once. Recording is performed in 104, and writing control is performed so that the subsequent carousels are not recorded on the medium unless the version is changed. In the example shown in FIG. 4, carousels C ₁₁ , C ₁₂ , C ₁₃ ..., C ₂₁ , C ₂₂ , C ₂₃ . The operation of the data recording control unit 103 that performs such writing control will be described in detail later.
The configuration of the data stream supplied to the data recording control unit 103 can be determined from the contents of a PMT (Program Map Table) included in PSI (Progam Specific Information) section information in the transport stream TS. The PMT is a table representing a correspondence relationship between a broadcast program included in the transport stream TS and each element such as video / audio / data content constituting the program.

The data recording control unit 103 generates data management information in a certain time interval for a plurality of data streams. The data management information includes a carousel version for each data stream and a write pointer indicating a recording position where the carousel is recorded on the recording medium 104.
Here, the contents of the data management information generated by the data recording control unit 103 will be described with reference to an example shown in FIG. As shown in FIG. 5, when data streams 1 to 4 are supplied, the data recording control unit 103 generates data management information when the carousel version changes in one of the data streams 1 to 4. Set the interval. For example, in FIG. 5, section 1 is set when the version first changes among data streams 1 to 4, that is, when data stream 2 changes from version 1 to version 2, and data management information MI of section 1 is set. ₁ , a carousel version for each data stream and a write pointer indicating a recording position where the carousel is recorded on the recording medium 104 are generated.

  In this way, the data recording control unit 103 records only one carousel per version for each data stream on the recording medium 104, and also writes the write pointer indicating the recording position and the version of the carousel for each data stream. While recording the data management information associated with each changing section on the recording medium 104, a pointer indicating the recording position of the data management information recorded on the recording medium 104 is sent to the synchronization information adding unit 102 as the above-mentioned synchronization information. It has become.

The recording medium 104 is a non-linearly accessible recording device such as a hard disk, and has a controller for read / write control, etc., and outputs a video / audio stream to which synchronization information is added, output from the synchronization information adding unit 102. A video / audio recording area, a data management information recording area for recording data management information and a carousel (or event message described later) output from the data recording control unit 103, and a data recording area, respectively.
In the data management information recording area and the data recording area, as shown in FIG. 6, data management information is file-managed, and carousels (or event messages described later) corresponding to the data management information are stored as data files. Here, the recording position of the data management information is designated by a pointer serving as synchronization information, and the recording position of a carousel (or event message described later) is designated by a writing pointer.

(2) Operation of Recording System 100 Next, the operation of the recording system 100 will be described with reference to FIGS. For example, assume that a transport stream TS received and demodulated by a tuner (not shown) is input to the demultiplexer 101. Then, the demultiplexer 101 separates the video / audio stream from the transport stream TS, converts the type into a program stream PS including one program in one stream, and supplies the stream to the synchronization information adding unit 102. The data broadcast data stream separated from the port stream TS is supplied to the data recording control unit 103.

  As shown in FIG. 2, the synchronization information adding unit 102 validates the PES extension field PEF and the PES private data field PDF in the program stream PS, and then supplies a pointer (synchronization information) supplied from the data recording control unit 103. ) Is stored in the PES private data field PDF, and the program stream PS to which the pointer (synchronization information) is added is sent to the recording medium 104 side. In the recording medium 104, a program stream PS (video / audio stream) to which a pointer (synchronization information) is added is stored in a video / audio recording area under the control of a read / write controller (not shown).

On the other hand, the data recording control unit 103 records a version of the carousel in the data stream supplied from the demultiplexer 101 only once on the recording medium 104, and does not record the medium for the subsequent carousels unless the version changes. Write control. The operation of the write control process executed by the data recording control unit 103 will be described below with reference to FIGS.
The data recording control unit 103 executes the write control process shown in FIG. 7 in response to a recording (recording) start instruction, and first initializes a variable X in step S1. The variable X is a value for identifying the carousel version. Next, in step S2, it is determined whether there is a recording end instruction. If there is a recording end instruction, the determination result is “YES”, and this process is completed. If there is no recording end instruction, the determination result is “NO”, and the process proceeds to the next step S3.

  In step S3, the table identification stored in the DMC-CC section header is read in the carousel supplied from the demultiplexer 101. As described above, the carousel transmits each module constituting the carousel in the DMC-CC section format, and the DMC-CC section format has a data structure shown in FIG. The table identification stored in the DMC-CC section header is for identifying whether the module to be transmitted is a DII module or a DDB module.

Subsequently, in step S4, it is determined whether or not the table identification read from the DMC-CC section header in step S3 is “0x3B”, that is, a DII module. If it is a DII module, the determination result is “YES”, and the process proceeds to the next step S5 to read the transaction identification included in the DMC-CC message header (see FIG. 8) in the DII module. The transaction identification included in the DMC-CC message header represents the carousel version.
In step S6, it is determined whether the read transaction identification matches the variable X, that is, whether the carousel version has changed. If there is no version change, the determination result is “YES”, and the process returns to step S2. On the other hand, if there is a version change, the determination result is “NO”, and the flow proceeds to step S7.

In step S7, the transaction identification read in step S5 is updated and registered in variable X. In steps S8 to S9, the currently supplied carousel, that is, the DII module subsequent to the DII module is recorded on the recording medium 104, the write pointer indicating the recording position, and the carousel version for each data stream. After sending data management information associated with each section whose version changes to the recording medium 104, a pointer (synchronization information) indicating the recording position of the data management information recorded on the recording medium 104 is sent to the synchronization information adding unit 102 The process returns to step S2.
Thereafter, the above-described processing in steps S2 to S9 is executed for a plurality of data streams until an instruction to end recording is given. Therefore, when the version of any carousel in each data stream is changed, a pointer (synchronization information) indicating the recording position of the data management information indicating it is added to the video / audio stream.

By the way, in data broadcasting, in addition to the data carousel method, an event message may be sent irregularly for the purpose of performing some operation on the data content being operated by the receiver. If the table identification read from the DMC-CC section header represents an event message, the determination result in step S4 is “NO”, and the process proceeds to step S10.
Then, the determination result in step S10 is “YES”, the process proceeds to step S11, and this event message is recorded in the recording medium 104. Thereafter, the process proceeds to step S9, and the data management information recorded on the recording medium 104 is recorded while recording the data management information including the data indicating the write pointer indicating the recording position of the event message and the event message on the recording medium 104. A pointer (synchronization information) indicating the recording position is sent to the synchronization information adding unit 102.

As a result of such write control processing, data management information is file-managed on the recording medium 104, for example as shown in FIG. 6, and a carousel (or event message) is correspondingly stored as a data file. It has become.
As described above, in the recording system 100, only one carousel per version is recorded for each data stream separated from the transport stream TS and multiplexed in multiple systems, and the write pointer indicating the recording position and each data are recorded. While recording data management information in which the version of the carousel for each stream is associated with each section whose version changes, the pointer (synchronization information) indicating the recording position of the recorded data management information is recorded in the synchronization information adding unit. The synchronization information adding unit 102 adds a pointer (synchronization information) indicating the recording position of the data management information to the PES packet of the video / audio stream separated from the transport stream TS, and stores it in the recording medium 104. Record.

(3) Configuration and Operation of Playback System 200 Next, the configuration and operation of the playback system 200 will be described with reference to FIG. 1 again. The reproduction system 200 includes a recording medium 104, a synchronization information extraction unit 201, a data reproduction control unit 202, a video / audio decoder 203, a data broadcast processing engine 204, a video synthesis unit 205, and an audio synthesis unit 206.
The synchronization information extraction unit 201 reads out the program stream PS (video / audio stream) recorded in the video / audio recording area of the recording medium 104 and outputs the program stream PS to the video / audio decoder 203 in the next stage. When a pointer (synchronization information) is added to the PES private data field PDF (see FIG. 2), it is extracted and output to the data reproduction control unit 202.

  The data reproduction control unit 202 reads the data management information specified by the pointer (synchronization information) supplied from the synchronization information extraction unit 201 from the data management information area of the recording medium 104, and uses the write pointer included in the data management information. The carousel (or event message) at the designated recording position is read from the data recording area of the recording medium 104 and sent to the data broadcasting processing engine 204 at the next stage.

The video / audio decoder 203 decodes the program stream PS (video / audio stream) supplied from the synchronization information extraction unit 201 into video data and audio data, and outputs them. The data broadcast processing engine 204 converts the carousel (or event message) for each data stream supplied from the data reproduction control unit 202 into a data broadcast screen or data broadcast sound and outputs the data broadcast screen.
The video synthesizing unit 205 generates video output by synthesizing the video data supplied from the video / audio decoder 203 and the data broadcast screen supplied from the data broadcast processing engine 204. The audio synthesizer 206 generates an audio output obtained by synthesizing the audio data supplied from the video / audio decoder 203 and the data broadcast audio supplied from the data broadcast processing engine 204.

The playback system 200 having such a configuration reads a program stream PS (video / audio stream) from the video / audio recording area of the recording medium 104 in response to a playback instruction, and a pointer (synchronization information) is read from the read program stream PS. If so, extract it. Then, the data management information specified by the extracted pointer (synchronization information) is read from the data management information area of the recording medium 104, and further, the carousel (or event of the recording position specified by the write pointer included in this data management information) Message) is read from the data recording area of the recording medium 104, and a carousel (or event message) for each data stream is reproduced in synchronization with the program stream PS (video / audio stream).
As a result, it is possible to perform synchronous reproduction with a video / audio stream without controlling the data content reproduction timing while avoiding repeated recording of data content that is repeatedly transmitted.

In this embodiment, in consideration of versatility, a pointer indicating the recording position of the carousel of the corresponding data stream is added as synchronization information to the PES private data field PDF in the PES packet of the MPEG-2 video / audio stream. However, as long as versatility is not considered, it may be stored in a predetermined area in the PES packet.
Moreover, although the above-described embodiment has been described as a hardware image in order to simplify the description, the present invention is not limited to this, and the components other than the recording medium 104 among the components of the broadcast recording / reproducing apparatus 10 described above are included. Of course, it can be implemented by program processing.

DESCRIPTION OF SYMBOLS 10 Broadcast recording / reproducing apparatus 100 Recording system 101 Demultiplexer 102 Synchronization information addition part 103 Data recording control part 104 Recording medium 200 Reproduction | regeneration system 201 Synchronization information extraction part 202 Data reproduction control part 203 Image | video / audio decoder part 204 Data broadcasting engine 205 Video composition Unit 206 Speech synthesis unit

Claims (2)

In a broadcast recording / reproducing apparatus that separates a transport stream into a video / audio stream and a data stream of a data broadcast and records and reproduces each separately,
When an event message is included in the data stream separated from the transport stream, event recording means for recording the event message on a recording medium;
Data management information generating means for generating data management information including a first pointer indicating a recording position of an event message recorded on the medium by the event recording means and data indicating an event message;
Data management information recording means for recording the data management information generated by the data management information generating means on a recording medium and outputting a second pointer indicating the recording position;
Video / audio recording means for adding a second pointer output by the data management information recording means to the video / audio stream separated from the transport stream and recording the recording medium on a recording medium;
Pointer extraction means for reading a video / audio stream recorded on a recording medium by the video / audio recording means, and extracting a second pointer added to the read video / audio stream;
Data management information specified by the second pointer extracted by the pointer extraction means is read from the recording medium, and an event message specified by the first pointer included in the data management information is read from the recording medium and reproduced. Reproduction means
A broadcast recording / reproducing apparatus comprising: In a broadcast recording / playback processing program that separates a transport stream into a video / audio stream and a data broadcast data stream and records and plays them separately,
When an event message is included in the data stream separated from the transport stream, an event recording process for recording the event message on a recording medium;
A data management information generating process for generating data management information including a first pointer indicating a recording position of the event message recorded on the medium in the event recording process and data indicating an event message;
A data management information recording process for recording the data management information generated in the data management information generation process on a recording medium and outputting a second pointer indicating the recording position;
A video / audio recording process in which a second pointer output by the data management information recording process is added to a video / audio stream separated from the transport stream and recorded on a recording medium;
A pointer extraction process for reading the video / audio stream recorded on the recording medium by the video / audio recording process and extracting a second pointer added to the read video / audio stream;
Data management information specified by the second pointer extracted by the pointer extraction process is read from the recording medium, and an event message specified by the first pointer included in the data management information is read from the recording medium and reproduced. Playback process and
Is executed by a computer.

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