JP2008199527A - Information processor, information processing method, program, and program storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To divide a stream at the time of format conversion. <P>SOLUTION: At step S41, the number of program sequences included in a stream defined by one ClipInfo is extracted and if a judgment is made at step S42 that the number is 2 or above, the neighborhood of boundary of the program sequences is analyzed, at step S43, based on the number and position of program sequences included in the stream and the PMT discontinuous point is detected. At step S44, the stream is divided at a proper position in front of the boundary of the PMT discontinuous point. At step S45, the number of ATC sequences included in the stream defined by one ClipInfo is extracted and if a judgment is made at step S46 that the number is 2 or above, the stream is divided at the boundary of the ATC sequence based on the number and position of the ATC sequences included in a stream at step S47. The invention is applicable to a video processor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information processing device, an information processing method, a program, and a program storage medium, and more particularly, to an information processing device, an information processing method, a program, and a program storage medium that are suitable for format conversion. .

  Conventionally, in order to manage an AV (Audio Visual) stream, two layers of a clip that is a pair of an AV stream and Clip Information that is information accompanying the AV stream and a PlayList having a time stamp that specifies an access point of the clip are provided. The application format is used.

In such an application format, when Clip Information has a plurality of different counter information, and each of the counter information has continuity as one sequence, and editing processing is performed after recording. Even so, there is a technique capable of easily managing the edited data and reproducing it without missing (for example, Patent Document 1).
WO2002 / 075739

  By the way, there may be a plurality of formats among such application formats, and format conversion may be required.

  In each format, it is conceivable that the upper limit numbers of the sequences corresponding to a plurality of different counter information that can be defined by one PlayList (that is, one Clip) are different.

  The present invention has been made in view of such circumstances, and is intended to enable format conversion when different formats exist.

  An information processing apparatus according to an aspect of the present invention is a content program configured to include a transport stream, entity management information for managing the entity of the transport stream, and reproduction management information for managing reproduction of the transport stream. An information processing apparatus that executes format conversion, the first information about the time axis of the transport stream included in the entity management information in the content program of the first format, and the change of the content program content Acquisition means for acquiring second information relating to points, splitting means for splitting the transport stream based on the first information or the second information acquired by the acquisition means, and by the splitting means The transport stream divided Including and a generation means for generating the content program in the second format.

  The first information included in the entity management information may be information based on counter information corresponding to a time when the transport stream is acquired. In the transport stream, the counter information Can be managed as one sequence, and the first format can manage a plurality of sequences by using one entity management information. The second format can be configured such that only one sequence can be managed using one entity management information, and the acquisition means includes the first format. Based on this information, the number of sequences constituting the transport stream managed by the entity management information is detected. In the case where the transport stream managed by the entity management information is composed of a plurality of sequences, the dividing means divides the transport stream so as to be one sequence at a time. Can be.

  In the transport stream, one part of the transport stream divided by the change point can be managed as one sequence, and the first format uses one entity management information. A plurality of sequences can be managed, and the second format can manage only one sequence using one entity management information. And the acquisition means can detect the number of sequences constituting the transport stream managed by the entity management information based on the second information, and the division The means includes the transport stream managed by the entity management information in a plurality of sequences. If you have made, it is possible to so that one sequence, so as to divide the transport stream.

  The first information included in the entity management information may be information based on counter information corresponding to a time when the transport stream is acquired. In the transport stream, the counter information Is managed as one sequence in the first sequence, and one part of the transport stream divided by the change point is managed as one sequence in the second sequence The first format can manage a plurality of sequences in both the first sequence and the second sequence by using one entity management information. And the second format includes one entity management information. In each of the first sequence and the second sequence, only one sequence can be managed, and the acquisition means includes the first information. Based on the second information, the number of sequences of the first sequence constituting the transport stream managed by the entity management information is detected, and the transport managed by the entity management information is based on the second information. The number of sequences of the second sequence constituting the port stream can be detected, and the dividing means can transmit the transport stream managed by the entity management information to the first sequence or the In at least one of the second sequences, by a plurality of sequences If you have made, such that one sequence in any of the first sequence and the second sequence can be so as to divide the transport stream.

  An information processing method according to an aspect of the present invention is a content program configured to include a transport stream, entity management information for managing the entity of the transport stream, and reproduction management information for managing reproduction of the transport stream. An information processing method for an information processing apparatus that executes format conversion, the first information about the time axis of the transport stream included in the entity management information in the content program of the first format, and the content program content Second information on the change point of the second information is obtained, the transport stream is divided based on the obtained first information or the second information, and the divided transport stream is included. Generate format content program Including the step.

  A program according to an aspect of the present invention and a program stored in a program storage medium include a transport stream, entity management information for managing the entity of the transport stream, and reproduction management for managing reproduction of the transport stream. A program that causes a computer to execute format conversion processing of a content program that includes information, the first relating to the time axis of the transport stream included in the entity management information in the content program of the first format Control of acquisition of information and second information related to changes in content program content, and dividing the transport stream based on the first information or the second information for which acquisition is controlled, Said transpo To execute a process including the step of generating a second format content programs including bets stream to the computer.

  In one aspect of the present invention, the first information related to the time axis of the transport stream and the second information related to the change in the content program content included in the entity management information in the content program in the first format are acquired. Then, the transport stream is divided based on the acquired first information or second information, and a content program of the second format including the divided transport stream is generated.

  The network is a mechanism in which at least two devices are connected and information can be transmitted from one device to another device. The devices that communicate via the network may be independent devices, or may be internal blocks that constitute one device.

  The communication is not only wireless communication and wired communication, but also communication in which wireless communication and wired communication are mixed, that is, wireless communication is performed in a certain section and wired communication is performed in another section. May be. Further, communication from one device to another device may be performed by wired communication, and communication from another device to one device may be performed by wireless communication.

  The video processing apparatus may be an independent apparatus, or may be a block that performs format conversion processing such as an information processing apparatus or a recording / reproducing apparatus.

  As described above, according to one aspect of the present invention, format conversion can be performed, and in particular, transport streams can be combined in accordance with the format.

  Embodiments of the present invention will be described below. Correspondences between constituent elements of the present invention and the embodiments described in the specification or the drawings are exemplified as follows. This description is intended to confirm that the embodiments supporting the present invention are described in the specification or the drawings. Therefore, even if there is an embodiment which is described in the specification or the drawings but is not described here as an embodiment corresponding to the constituent elements of the present invention, that is not the case. It does not mean that the form does not correspond to the constituent requirements. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

  An information processing apparatus according to an aspect of the present invention (for example, the video processing apparatus 11 in FIG. 1) includes a transport stream (for example, a TS configured to include an AV stream) and an entity management for managing the entity of the transport stream. An information processing apparatus that executes format conversion of a content program including information (for example, ClipInformation) and reproduction management information (for example, PlayList) for managing reproduction of the transport stream, wherein the first format First information related to the time axis of the transport stream (for example, num_of_ATC_sequences of SequenceInfo ()) included in the entity management information of the content program, and changes in the content program content (for example, transport packets) PID changes or video stream Acquisition means (for example, ATC sequence number detection unit 131 in FIG. 23 or program sequence number detection unit) that acquires second information (for example, num_of_program_sequences of ProgramInfo ()) regarding the component type is changed from SDTV to HDTV) 132), dividing means for dividing the transport stream based on the first information or the second information acquired by the acquiring means (for example, the stream dividing unit 133 in FIG. 23), and the dividing Generating means (for example, the post-conversion data storage control unit 118 in FIG. 23) that generates the content program in the second format including the transport stream divided by the means.

  The first information included in the entity management information may be information based on counter information (for example, ATC) corresponding to a time when the transport stream is acquired. The counter information can be managed as one sequence (for example, an ATC sequence) in which the counter information has a continuity, and the first format uses a plurality of entity management information. A sequence can be managed, and the second format can be configured to manage only one sequence using one entity management information. And the acquiring means is configured to manage the transport stream managed by the entity management information based on the first information. When the transport stream managed by the entity management information is composed of a plurality of sequences, the dividing means can detect the number of sequences constituting one sequence. The port stream can be divided.

  In the transport stream, one part of the transport stream divided by the change point can be managed as one sequence (for example, a program sequence), and the first format is one A plurality of sequences can be managed using the entity management information, and the second format can manage only one sequence using one entity management information. The acquisition means can detect the number of sequences constituting the transport stream managed by the entity management information based on the second information, The dividing means includes a plurality of transport streams managed by the entity management information. If it has been configured by Sequence, so that one sequence, it is possible to divide the transport stream.

  The first information included in the entity management information may be information based on counter information (for example, ATC) corresponding to a time when the transport stream is acquired. A portion in which the counter information has continuity is managed as one sequence in a first sequence (for example, an ATC sequence), and a portion of the transport stream divided by the change point is a second sequence. (For example, a program sequence) can be managed as one sequence, and the first format can be any one of the first sequence and the second sequence using one entity management information. It is also possible to manage multiple sequences in The second format can manage only one sequence in each of the first sequence and the second sequence using one entity management information. And the acquisition means detects the number of sequences of the first sequence constituting the transport stream managed by the entity management information based on the first information. And the number of sequences of the second sequence constituting the transport stream managed by the entity management information can be detected based on the second information, and the dividing means can detect the entity The transport stream managed by management information is the first sequence or the second sequence. When at least one of the sequences is composed of a plurality of sequences, the transport stream can be divided so that one sequence is included in each of the first sequence and the second sequence. .

  An information processing method according to an aspect of the present invention includes a transport stream (for example, a TS including an AV stream), entity management information (for example, ClipInformation) for managing the entity of the transport stream, and the transport An information processing method of an information processing apparatus (for example, the video processing apparatus 11 in FIG. 1) that performs format conversion of a content program configured to include reproduction management information (for example, PlayList) that manages reproduction of a stream, First information on the time axis of the transport stream (for example, num_of_ATC_sequences of SequenceInfo ()) included in the entity management information in the content program of the first format, and changes in the content program content (for example, trans Port packet PID changes, video stream Second information (for example, num_of_program_sequences of ProgramInfo ()) is acquired (for example, the process of step S41 or step S45 in FIG. 25), and the acquired Based on the first information or the second information, the transport stream is divided (for example, the process of step S44 or step S47 of FIG. 25), and the second format including the divided transport stream A step of generating a content program (for example, the process of step S15 in FIG. 24) is included.

  A program according to one aspect of the present invention includes a transport stream (for example, a TS configured to include an AV stream), entity management information (for example, ClipInformation) for managing the entity of the transport stream, and the transport stream A program that causes a computer to execute format conversion processing of a content program that includes playback management information (for example, PlayList) that manages playback, and is included in the entity management information in the content program of the first format. First information on the time axis of the transport stream (for example, num_of_ATC_sequences of SequenceInfo ()) and changes in content program content (for example, the PID of the transport packet changes, or the component type of the video stream is SDTV Or The acquisition of second information (for example, num_of_program_sequences of ProgramInfo ()) related to the HDTV is controlled (for example, the process of step S41 or step S45 in FIG. 25), and the first information whose acquisition is controlled. Alternatively, based on the second information, the transport stream is divided (for example, the process of step S44 or step S47 in FIG. 25), and a content program of the second format including the divided transport stream is generated. (For example, the process of step S15 in FIG. 24) causes the computer to execute a process including a step.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the video processing apparatus 11.

  For example, the video processing device 11 receives a broadcast signal, acquires content data equivalent to the broadcast signal via various networks including a telephone line and CATV, and records the received or acquired data internally. Then, it is possible to execute a process of outputting to the display device 13 and displaying it, or recording on a recording medium such as the mounted optical disk 12. In addition, the video processing apparatus 11 executes a process of converting the format of data recorded on a recording medium such as the mounted optical disk 12, received data, or data supplied from the outside as necessary. Can do. Further, the video processing device 11 records the data acquired and recorded therein or subjected to the format conversion processing on a recording medium such as the mounted optical disk 12 or supplies it to other external devices. And the like can be executed.

  The video processing apparatus 11 includes a control unit 31, an antenna 32, a broadcast reception control unit 33, a re-encoding processing unit 34, a data recording processing unit 35, a local storage 36, a disk drive 37, a network interface 38, a conversion processing unit 39, and an operation input. The acquisition unit 40, the playback control unit 41, the AV decoder unit 42, and the display control unit 43 are configured.

  The control unit 31 controls each unit of the video processing device 11. Specifically, for example, based on the user's operation input acquired by the operation input acquisition unit 40, the data recorded on the optical disk 12 mounted on the disk drive 37 is read, and the content desired by the user is reproduced. Control the process of recording in the local storage 36, and control the process of recording the broadcast signal whose reception is controlled by the broadcast reception control unit 33 and the data supplied via the network interface 38 in the local storage 36. Or the conversion processing unit 39 is controlled to control the process of converting the format of the data recorded in the local storage 36.

  The antenna 32 receives a broadcast signal and supplies it to the broadcast reception control unit 33.

  The broadcast reception control unit 33 performs tuning and demodulation of the broadcast signal received by the antenna 32, and the re-encoding processing unit 34 does not need to re-encode the demodulated broadcast signal when re-encoding is necessary. In this case, the data is supplied to the data recording processing unit 35.

  The re-encoding processing unit 34 performs a re-encoding process for converting a broadcast signal received by the broadcast reception control unit 33 into a data format that can be handled by the video processing device 11 based on the control of the control unit 31. Execute.

  The data recording processing unit 35 is a transport stream (TS such as a broadcast signal received by the broadcast reception control unit 33, data supplied from the network interface 38, or encoded data re-encoded by the re-encoding processing unit 34. ) Is added with an ATS (arrival time stamp) which is a kind of time information corresponding to the time when the transport stream is acquired, packetized, and supplied to the local storage 36. When the data supplied to the data recording processing unit 35 is a transport stream that has already been packetized, the data recording processing unit 35 adds an ATS to the supplied transport stream and supplies the transport stream to the local storage 36. It is good as a thing. Details of processing of the data recording processing unit 35 and ATS will be described later with reference to FIG.

  The local storage 36 is composed of, for example, a hard disk and records supplied data.

  The network interface 38 is connected to the network by wire or wirelessly, communicates with other devices via the network according to control from the control unit 31, and stores data acquired from other devices in the local storage The data supplied to 36 or the data supplied from the local storage 36 is transmitted to another device. In addition, when the network interface 38 acquires content data equivalent to the broadcast signal via various networks including a telephone line and CATV, the network interface 38 supplies the acquired content data to the data recording processing unit 35 as necessary. .

  For example, the disk drive 37 is loaded with a recording medium such as the optical disk 12, and based on the control of the control unit 31, reads data from the loaded recording medium and supplies it to the local storage 36 for recording or loading. The data supplied from the local storage 36 is recorded on the recording medium.

  The conversion processing unit 39 executes processing for converting the format of data recorded in the local storage 36 based on the control of the control unit 31. Details of functions of the conversion processing unit 39 and format conversion will be described later.

  The operation input acquisition unit 40 includes, for example, a button, a key, a dial, a touch pad, or a reception unit that receives infrared rays supplied from a remote commander (not shown), acquires operation input from the user, It supplies to the control part 31.

  The reproduction control unit 41 controls reproduction of data by the AV decoder unit 42 based on the control of the control unit 31.

  Based on the control of the playback control unit 41, the AV decoder unit 42 converts the data acquired from the local storage 36 into the type of the data (for example, audio data, video data, text data, Based on whether the data is other data, etc.), the corresponding data is decoded and supplied to the external display device 13.

  Based on the control of the control unit 31, the display control unit 43 generates display screen data corresponding to, for example, a notification to the user or a menu screen, and supplies the display screen data to the external display device 13 to control the display. At the same time, for example, display screen data supplied from the conversion processing unit 39 corresponding to a notification to a user, a menu screen, or the like is supplied to the external display device 13 to control the display.

  As described above, the data recording processing unit 35 receives the broadcast signal received by the broadcast reception control unit 33, the data supplied from the network interface 38, or the encoded data re-encoded by the re-encoding processing unit 34. The data is converted into a transport stream of a predetermined format, and ATS, which is a kind of time information corresponding to the time when the transport stream is acquired, is added to the head of the transport stream and supplied to the local storage 36.

  FIG. 2 shows a recorder model of an MPEG2 (Moving Picture Experts Group 2) transport stream. This is a conceptual model for defining the recording process. MPEG2 transport streams must follow this model. In the video processing apparatus 11 of FIG. 1, the data recording processing unit 35 has a function of packetizing an MPEG2 transport stream and adding ATS according to the recorder model shown in FIG.

  The input MPEG2 transport stream is a full transport stream or a partial transport stream. The input MPEG2 transport stream must conform to ISO / IEC13818-1 or ISO / IEC13818-9.

  Then, the i-th byte of the input MPEG2 transport stream is transmitted to T-STD (Transport stream system target decoder stipulated in ISO / IEC 13818-1) 81 and source packetizer 84 at time t. Input simultaneously to (i).

  The T-STD 81 is a virtual decoder in the MPEG-2 transport stream recorder model system, and a decoder corresponding to the T-STD 81 does not exist in the data recording processing unit 35.

  The PLL 82 generates a frequency (for example, a 27 MHz clock) locked to the value of the PCR (Program Clock Reference) of the MPEG2 transport stream.

  An arrival time clock counter 83 is a binary counter that counts 27 MHz frequency pulses output from the PLL 82. Arrival_time_clock (i) is a count value of Arrival time clock counter 83 at time t (i).

  The source packetizer 84 adds TP_extra_header to all transport packets to create a source packet. Further, the source packetizer 84 adds ATS to the transport packet.

  In other words, the source packetizer 84 sets the value of ATS (hereinafter also referred to as Arrival_time_stamp) in the TP_extra_header of the source packet based on Arrival_time_clock (i) supplied from the arrival time clock counter 83. Arrival_time_stamp represents the time at which the first byte of the transport packet arrives at both the T-STD 81 and the source packetizer 84. Arrival_time_stamp (k) is a sample value of Arrival_time_clock (k), where k indicates the first byte of the transport packet.

  When the data supplied to the data recording processing unit 35 is a transport stream packetized in a predetermined format, the source packetizer 84 adds an ATS to the supplied source packet and supplies it to the write buffer 85. It is good as a thing.

  The write buffer 85 is a buffer used when a source packet is recorded in the local storage 36.

  If the maximum bit rate of the input transport stream is TS_recording_rate, Rmax, which is the input bit rate of the source packet stream from the source packetizer 84 to the write buffer 85, is calculated as shown in the following equation (1).

  Rmax = TS_recording_rate × 192/188 (1)

  The output bit rate Rud from the write buffer 85 to the local storage 36 takes a predetermined value when the write buffer 85 is not empty, and is zero when the write buffer 85 is empty. Each packet output from the write buffer 85, to which the ATS corresponding to the arrival time of each packet at the T-STD 81 is added, is supplied to the local storage 36 and recorded.

  Next, an application format of data handled in the video processing device 11 will be described.

  FIG. 3 shows a simplified structure of an application format of data handled in the video processing apparatus 11.

  The application format has two layers, PlayList and Clip, for managing AV (Audio Visual) streams. Here, an AV stream and, if necessary, for example, a data stream that can be reproduced together with the AV stream, such as text data corresponding to subtitles, and accompanying information, for managing the entity of the corresponding AV stream A pair of Clip Information, which is information of the above, is considered as one object, and these are collectively referred to as Clip. Hereinafter, an AV stream data file is referred to as an AV stream file. A data file of Clip Information is referred to as a Clip Information file.

  In general, files used in computers are handled as byte strings, but contents composed of AV stream files and the like are expanded on the time axis, and clip access points are mainly designated by PlayLists with time stamps. Is done.

  When the access point in Clip is indicated by PlayList with a time stamp, the Clip Information file is used to find address information to start decoding in a stream such as an AV stream file from the time stamp.

  The PlayList is information for managing the playback of the AV stream, and is a set of information indicating playback sections such as the AV stream. Specifically, for example, information indicating one playback section in a certain AV stream is called PlayItem, and PlayItem is an IN point (playback start point) and OUT point (playback end point) of the playback section on the time axis. It is represented by a pair. Therefore, the PlayList is composed of one or a plurality of PlayItems as shown in FIG.

  In FIG. 3, the first PlayList illustrated first from the left is composed of two PlayItems, and the first Play portion and the latter half of the AV stream included in the first Clip illustrated on the left side by the two PlayItems. Each part is referenced. Also, the second PlayList shown second from the left is composed of one PlayItem, so that the entire AV stream included in the second Clip shown on the right is referred to. Furthermore, the third PlayList illustrated third from the left is composed of two PlayItems, and by the two PlayItems, a predetermined part of the AV stream included in the first Clip illustrated on the left side, and Reference is made to a predetermined portion of the AV stream included in the second Clip shown on the right side.

  The navigation program (Navigation program) is a program for causing the playback control unit 41 to execute a function of controlling the playback order of the PlayList and interactive playback of the PlayList.

  The navigation program is composed of an index table and Movie Object and BD-J Object read by the index table. The index table defines content titles and menus, and holds entry points for each title and menu.

  Movie Object and BD-J Object have a function of controlling the playback order of the PlayList and interactive playback of the PlayList. Movie Object and BD-J Object also have a function of displaying a menu screen for the user to instruct execution of various reproductions. The BD-J Object is described in a programming language such as Java (registered trademark).

  For example, when the leftmost PlayItem included in the left PlayList is specified by the Movie Object or BD-J Object as the information indicating the playback position at that time, the AV stream included in the Clip referred to by the PlayItem Playback of the first half is performed. Thus, the PlayList is used as reproduction management information for managing reproduction of AV stream files and the like.

  In addition, a navigation command may be included in Movie Object and BD-J Object. The navigation commands are various commands for controlling playback of an AV stream file or the like.

  The navigation program also has a function of displaying a menu screen for the user to instruct execution of various reproductions. This navigation program is described in a programming language such as Java (registered trademark), for example, and constitutes one program together with PlayList and Clip.

  Further, in the PlayList described with reference to FIG. 3, in addition to the main path (Main Path) specified by PlayItem, information on the sub path (Sub path) specified by using the sub play item (Sub Play Item) is included. It can also be included. When SubPlayItem is defined, for example, an independent data stream that is not multiplexed with a Clip (for example, MPEG2 transport stream) specified by PlayItem can be played back in synchronization with AV stream playback.

  For example, subtitle related information composed of a text subtitle file and a font file necessary for rendering, corresponding to the clip AV stream of the main path (Main Path) specified by PlayItem, and the playback section of the subtitle related information By preparing a SubPlayItem that specifies, the subtitles corresponding to the data described in the text subtitle file are displayed in the display font based on the font data described in the font file simultaneously with the playback of the Clip AV stream. It can be displayed on the device 13. Also, for example, by providing dubbed audio data in another language and SubPlayItem corresponding to dubbed audio data in correspondence with the Clip AV stream of the main path specified by PlayItem, playback of the Clip AV stream At the same time, dubbed voice data in other languages can be reproduced and output.

  Similarly, in correspondence with the Clip AV stream of the main path (Main Path) specified by PlayItem, not only the text data stream (TextST stream) for subtitle display but also the bitmap subtitles such as a predetermined GUI display screen A PG stream (Presentation Graphics stream) that is a run-length encoded stream, or an interactive graphics presentation menu that includes items such as buttons, icons, or thumbnails that can be input by the user. SubPlayItem corresponding to an IG stream (Interactive graphics stream) for displaying a subtitle, a GUI display screen, and the like can be reproduced and output simultaneously with the reproduction of the Clip AV stream.

  Further, content that can be played back by the video processing device 11 and data for playing back the content, in other words, a navigation program, PlayList, and Clip that can be handled by the video processing device 11 are content programs or simply programs. Shall be referred to as There are a plurality of types of content program formats that can be handled by the video processing device 11. In the video processing device 11, the format of the content program recorded in the local storage 36 is converted based on a user operation input. It is possible.

  PG and IG may be included in the Clip with restrictions depending on the format of the content program. Specifically, for example, there can be a data format in which IG can be included in a Clip, and a data format in which IG cannot be included in a Clip.

  Next, an example of the structure of an AV stream file will be described. The AV stream file can have, for example, an MPEG2 transport stream structure as shown in FIG.

  The MPEG2 transport stream is composed of an integer number of Aligned units. The size of the Aligned unit is 6144 bytes (2048 × 3 bytes), and starts from the first byte of the source packet. The source packet is 192 bytes long. One source packet is composed of a TP_extra_header and a transport packet. TP_extra_header is 4 bytes long, and the transport packet is 188 bytes long. One Aligned unit is composed of 32 source packets. Video stream and audio stream data are packetized into MPEG2 PES (Packetized Elementary Stream) packets, and PES packets are packetized into transport packets.

  The syntax of the source packet is shown in FIG.

  TP_extra_header () is a 4-byte header. Transport_packet () is an MPEG-2 transport packet having a length of 188 bytes defined by ISO / IEC 13818-1.

  FIG. 6 shows the syntax of TP_extra_header.

  copy_permission_indicator is an integer representing the copy limit of the payload of the corresponding transport packet.

  arrival_time_stamp is a time stamp indicating the time at which the corresponding transport packet arrives at the T-STD 81 in the recorder model of the MPEG2 transport stream described with reference to FIG. This is an integer value having a value specified by arrival_time_stamp (ATS).

  In addition, as described above, there are a plurality of formats of content programs (navigation program, PlayList, and Clip) that can be handled by the video processing device 11, and the video processing device 11 is based on a user's operation input. Thus, it is possible to convert the format of desired data.

  The format of the content program that can be handled by the video processing device 11 includes a first format and a second format that differ in the number of sequences that can be defined in one ClipInfo (in other words, one PlayList).

  With reference to FIG. 7, the structure of the transport stream in each of the first format and the second format will be described.

  The first format is, for example, a data format assuming that a broadcast stream is recorded as it is, and the upper limit of the number of ATC sequences that can be defined in one ClipInfo (in other words, one PlayList) is 255. Here, one ATC sequence is a source packet sequence that does not include a discontinuous point of ATC (or arrival time base).

  The second format is a format close to the format for recording a content program on a playback-only removable medium (for example, a playback-only optical disk) (ie, very compatible with a format for playback-only removable media). Unlike the first format, the number of ATC sequences that can be defined in one ClipInfo (in other words, one PlayList) is one.

  Also, in both the first format and the second format, the upper limit of the number of STC (System Time Clock) sequences that can be defined in one ClipInfo (in other words, one PlayList) is 225. Here, one STC sequence is a source packet sequence that does not include STC discontinuities.

  The STC definition follows the definition specified in MPEG-2. That is, this is a system time base clock that is a time axis created based on PCR (Program Clock Reference) in the transport stream. The STC value is represented by the count value of a binary counter with 90 kHz accuracy and 33-bit length.

  A value counted by the video processing device 11 when the ATC newly records an input transport stream as a Clip AV stream file, for example, when a broadcast signal is received or AV stream data that is the basis of content is acquired. On the other hand, STC is a value that is counted at the stream supply source and assigned to the stream. The STC discontinuity is, for example, when the acquired stream is a broadcast signal, when the broadcasting station switches the transmission system, when the recording side (that is, the video processing device 11) switches the recording channel, Occurs when editing is performed.

  In the first format, the upper limit of the number of program sequences (program-sequence) that can be defined in one ClipInfo (in other words, one PlayList) is 255. In the second format, one ClipInfo (In other words, the number of program sequences that can be defined in one PlayList) is one.

  Here, it is assumed that the source packet sequence in which the content program content defined by this format is constant in the stream file is one program sequence. For example, when the PID of the transport packet changes or the component type of the video stream changes from SDTV to HDTV, before and after the change point, different program sequences are set.

  Further, the upper limit of the number of ClipInfo files that can be included in one directory at the time of data recording is 200 in the first format and 4000 in the second format.

  Also, in both the first format and the second format, a PG that is a stream obtained by run-length encoding a bitmap subtitle such as a predetermined GUI display screen is included in the Clip by satisfying certain conditions. It is possible. In the first format, for example, an IG for displaying an interactive graphics menu (Interactive graphics presentation menu) including items such as buttons, icons, or thumbnails that can receive user operation input is clipped. However, in the second format, IG can be included in the Clip.

  In the first format, the main video stream, subtitles, and PG are all handled as video streams and are not clearly distinguished on the syntax as being different stream types, but in the second format, The main video stream and subtitles, PG, and IG are clearly distinguished on the syntax as being different stream types.

  Next, format conversion between the first format and the second format will be described with reference to FIG.

  As described with reference to FIG. 7, the first format and the second format differ in the number of sequences that can be defined in one ClipInfo (in other words, one PlayList). Also, the structures of PlayList and ClipInfo are different.

  When the number of ATC_sequence and Program_sequence is the same in the first format and the second format, in other words, a sequence defined in one ClipInfo (in other words, one PlayList) in the first format. When the number is 1 in both ATC_sequence and Program_sequence, it is possible to convert data between both formats without converting the transport stream by converting the accompanying Database file (PlayList / ClipInfo). Become.

  On the other hand, when the number of ATC_sequence and Program_sequence is different between the first format and the second format, in other words, one ClipInfo (in other words, one PlayList in the first format). If the number of sequences defined in (1) is not 1 in any of ATC_sequence and Program_sequence, the accompanying Database file (PlayList / ClipInfo) is converted when performing format conversion between the first format and the second format. In addition, it is necessary to convert the transport stream.

  That is, when data described in the first format is converted into the second format, a plurality of ATC_sequences or Program_sequences are included in a transport stream defined by one ClipInfo (in other words, one PlayList). Is included, the transport stream is divided so that there is one ATC_sequence and Program_sequence, and an associated Database file (PlayList / ClipInfo) is generated in association with each transport stream, Further, an index file of the navigation program corresponding to this is generated.

  For example, as shown in FIG. 9, among the data described in the first format, the first transport stream defined by Clip 1 includes 4 of # 1 ATC_sequence, # 2 ATC_sequence, # 3 ATC_sequence, and # 4 ATC_sequence. Consider the case where two ATC_sequences are included.

  When this data is converted to the second format, the number of ATC_sequences that can be defined in one ClipInfo (in other words, one PlayList) is only one in the second format. # 1 ATC_sequence is defined by Clip1, # 2ATC_sequence is defined by Clip2, # 3ATC_sequence is defined by Clip3, and # 4ATC_sequence is defined by Clip3 in association with each transport stream. An accompanying Database file (PlayList / ClipInfo) is converted and generated.

  Further, FIG. 10 shows a case where a transport stream defined by a certain clip of data described in the first format includes not only a plurality of ATC_sequences but also a plurality of Program_sequences. It explains using.

  That is, as shown in FIG. 10, a transport stream defined by a certain clip of data described in the first format includes two Program_sequences, three ATC_sequences and STC_sequences, and ATC_sequence Consider the case where the boundary positions of STC_sequence and STC_sequence are the same, and the boundary positions of two Program_sequences are different from the two boundary positions of three ATC_sequences and STC_sequences.

  When this data is converted to the second format, the number of ATC_sequences and Program_sequences that can be defined in one ClipInfo (in other words, one PlayList) is only one in the second format. Thus, the transport stream is divided into one boundary position existing between two Program_sequences and two boundary positions existing between three ATC_sequences and STC_sequences. That is, one transport stream defined by one Clip described in the first format is divided into four, and the four divided sequences are Clip1 to Clip4 which are four different Clips, respectively. As described above, an associated Database file (PlayList / ClipInfo) is generated by being converted in association with each transport stream.

  When data described in the second format is converted to the first format, a transport stream defined by one ClipInfo (in other words, one PlayList) is directly used as one transport. Although the stream may be a stream, the upper limit of the number of ClipInfo files that can be included in one directory differs between the first format and the second format, so that ATC_sequence, STC_sequence, and Program_sequence do not exceed 255, respectively. In a range, the number of ClipInfo files may be reduced by combining a plurality of transport streams into one transport stream. When transport streams are combined, one corresponding Database file (PlayList / ClipInfo) is generated corresponding to the combination of transport streams.

  As described above, in both the first format and the second format, by satisfying a certain condition, PG, which is a stream obtained by run-length encoding a bitmap subtitle such as a predetermined GUI display screen, Can be included in Clip. On the other hand, in the first format, for example, to display an interactive graphics menu (Interactive graphics presentation menu) including items such as buttons, icons or thumbnails that can receive user operation input. IG cannot be included in the Clip, but in the second format, IG can be included in the Clip.

  For example, when the broadcast content whose reception is controlled by the broadcast reception control unit 33 is recorded in the local storage 36 in the first format, the menu screen by IG cannot be attached as it is. For example, when the content program recorded in the local storage 36 is edited, when the user requests to add a menu screen by IG to the edited content program, the content program is recorded in the first format. If the content program is converted to the second format, a menu screen by IG can be attached.

  The video processing apparatus 11 can perform mutual conversion between the first format and the second format based on, for example, a user operation input. In the video processing device 11, it is confirmed whether the format of the file instructed by the user to change the format is the first format or the second format, and one ClipInfo (in other words, in the converted format) For example, the conversion process is executed so as not to violate the upper limit of the number of sequences and files that can be defined in one PlayList).

  Next, a database format for managing reproduction information of AV stream files will be described.

  FIG. 11 shows the syntax of the Clip Information file in the first format. The Clip Information file includes SequenceInfo (), ProgramInfo (), and CPI ().

  type_indicator indicates the type of the file.

  version_number indicates four character characters indicating the version number of the zzzzz.clpi file.

  SequenceInfo_start_address indicates the start address of SequenceInfo () with the relative number of bytes from the start byte of the zzzzz.clpi file as a unit. The relative number of bytes is counted from zero.

  ProgramInfo_Start_address indicates the start address of ProgramInfo () with the relative number of bytes from the start byte of the zzzzz.clpi file as a unit. The relative number of bytes is counted from zero.

  CPI_Start_address indicates the start address of CPI () with the relative number of bytes from the start byte of the zzzzz.clpi file as a unit. The relative number of bytes is counted from zero.

  ClipMark_Start_address indicates the start address of ClipMark () with the relative number of bytes from the start byte of the zzzzz.clpi file as a unit. The relative number of bytes is counted from zero.

  MakersPrivateData_Start_address indicates the start address of MakersPrivateData () with the relative number of bytes from the start byte of the zzzzz.clpi file as a unit. The relative number of bytes is counted from zero. padding_word (padding word) is inserted according to the syntax of zzzzz.clpi. N1 to N6 are zero or any positive integer. Each padding word may take an arbitrary value.

  ClipInfo () stores attribute information of a corresponding AV stream file (Clip AV stream). The syntax of ClipInfo () is different between the first format and the second format. Details of each syntax are omitted here, but in each syntax, fields of Clip_stream_type, application_type, and TS_type_info_block are included. The 8-bit field of Clip_stream_type indicates the type of AV stream corresponding to the Clip Information file. Application_type represents the type of application.

  SequenceInfo () defines information on the ATC-sequence and STC-sequence in the Clip AV stream. SequenceInfo () will be described later with reference to FIG.

  PloglamInfo () stores information on the change point of the content program content in the AV stream file. PloglamInfo () will be described later with reference to FIGS. 19 and 20.

  CPI () defines information for associating time information in the AV stream with an address in the file.

  In addition, information on the mark that makes it possible to set the beginning point of the program, scene change point, etc. in the clip is in ClipMark (), information specific to the manufacturer of the recording and playback device that recorded this ClipMark is in MakersPrivateData (), Each is stored.

  In addition, regarding the syntax of the Clip Information file in the second format, the configuration of this part is the same as that in the first format described with reference to FIG. 11, and thus description of each field and the like is omitted. The possible values for each field in the syntax are different.

  Specifically, for example, in the first format, for example, information on a mark that makes it possible to provide, for example, a program start point or a scene change point is described in ClipMark (). However, in the second format, use of the corresponding portion of information is undefined. Further, as described above, since the upper limit of the number of definable sequences is different between the first format and the second format, description of corresponding portions (for example, SequenceInfo () and ProgramInfo ()) is also included. Each is different.

  The syntax of the TS_type_info_block () described above is the same in the first format and the second format, and devices that handle data defined by these data formats, including the video processing device 11, are included in TS_type_info_block (). The type of data format is determined with reference to the values described in (1). FIG. 12 shows the syntax of TS_type_info_block () in the first format and the second format. Devices that handle data defined by these data formats, including the video processing device 11, determine the format type of the data by checking the Format_Identifier and Stream_format_name of TS_type_info_block ().

  Next, before describing the syntax of SequenceInfo () in the first format and the second format, ATC-sequence and STC-sequence defined in SequenceInfo () will be described.

  First, the ATC-sequence defined in SequenceInfo () will be described.

  The time axis created based on the arrival time stamp (ATS) of each source packet constituting the AV stream file is called an arrival time base, and its clock is called an ATC (Arrival Time Clock). A source packet sequence that does not include ATC discontinuities (arrival time base discontinuities) is called an ATC-sequence.

  FIG. 13 is a diagram for explaining the ATC-sequence. For example, when the input transport stream is newly recorded as a Clip AV stream file, such as when a broadcast signal is received, the Clip does not include an ATC discontinuity, and has only one ATC-sequence. It is assumed that the ATC discontinuity is created only when the stream data of the Clip AV stream file is partially deleted by editing or the like.

  In the AV stream file, the address at which the new ATC starts, that is, the start address of the ATC-sequence is stored in SequenceInfo (). This address is indicated by SPN_ATC_start.

  The ATC-sequence other than the last ATC-sequence in the AV stream file starts from the source packet pointed to by the SPN_ATC_start and ends with the source packet immediately before the source packet pointed to by the next SPN_ATC_start. The last ATC-sequence starts with the source packet pointed to by the SPN_ATC_start and ends with the last source packet of the AV stream file.

  FIG. 14 is a diagram for explaining the relationship between ATC discontinuity points and ATC-sequences. In this example, the Clip AV stream file has two ATC discontinuities and three ATC-sequences.

  Next, the STC-sequence defined in SequenceInfo () will be described.

  The definition of STC (System Time Clock) follows the definition defined in MPEG-2. That is, this is a system time base clock that is a time axis created based on PCR (Program Clock Reference) in the transport stream. The STC value is represented by the count value of a binary counter with 90 kHz accuracy and 33-bit length.

  FIG. 15 is a diagram for explaining continuous STC intervals. Here, the horizontal axis is Arrival Time Clock (or arrival time base), and the vertical axis is STC (or system time base). Also, white circles in the figure indicate the time when the last byte of PCR in the TS packet arrived. In case 1, the STC monotonically increases, and the STC in that section is continuous. In case 2, the 33-bit STC wraps around. STC wraparound points are not STC discontinuities. STC is continuous even after wraparound.

  As described above, STC discontinuity occurs when the broadcasting station switches the transmission system, when the recording side (for example, the video processing device 11) switches the recording channel, or when the user performs an editing operation. appear.

  A source packet sequence that does not include STC discontinuities (system time base discontinuities) is referred to as an STC-sequence. Note that the same STC value never appears in the same STC_sequence. Therefore, the maximum time length of Clip is limited to a 33-bit STC wraparound period (about 26 hours) or less.

  In the AV stream file, an address at which a new STC starts, that is, an STC-sequence start address is stored in SequenceInfo (). This address is indicated by SPN_STC_start.

  The STC-sequence does not cross the ATC-sequence boundary.

  The STC-sequence other than the last STC-sequence in the AV stream file starts from the source packet pointed to by the SPN_STC_start and ends with the source packet immediately before the source packet pointed to by the next SPN_STC_start. The last STC-sequence starts with the source packet pointed to by the SPN_STC_start and ends with the last source packet of the AV stream file.

  FIG. 16 is a diagram for explaining the relationship between STC discontinuities and STC-sequences, and the relationship between STC-sequences and ATC-sequences. In this example, the Clip AV stream file has three STCs and three STC-sequences. One STC-sequence does not cross the ATC-sequence boundary.

  If the AV stream has STC discontinuities, the same PTS (Program Time Stamp) may appear in the AV stream file. Therefore, when a certain time on the AV stream is indicated on the PTS basis, the PTS of the access point alone is not sufficient for specifying the point. In addition to the PTS, an STC-sequence index including the PTS is required. This index is called STC-id.

  The first format and the second format have the same syntax structure of SequenceInfo (), but have different restrictions on the values that can be taken.

  Next, the syntax of SequenceInfo () in the first format and the second format will be described with reference to FIG.

  length indicates the number of bytes from the byte immediately after this length field to the last byte of SequenceInfo ().

  num_of_ATC_sequences indicates the number of ATC-sequences in the AV stream file.

  That is, the values that num_of_ATC_sequences can take differ between the first format and the second format. That is, as the value of num_of_ATC_sequences, a value of 255 or less can be taken in the first format, but only 1 can be taken in the second format.

  SPN_ATC_start [atc_id] indicates an address at which the ATC-sequence pointed to by atc_id starts on the AV stream file. SPN_ATC_start [atc_id] has a size with the source packet number as a unit, and is counted from the first source packet of the AV stream file with zero as an initial value.

  The first SPN_ATC_start [0] in SequenceInfo () is zero. The values of SPN_ATC_start [atc_id] entered in SequenceInfo () are arranged in ascending order. That is, SPN_ATC_start [atc_id] entered in SequenceInfo () satisfies the following condition.

SPN_ATC_start [0] = 0
For atc_id where 0 <atc_id <num_of_ATC_sequences
SPN_ATC_start [atc_id−1] <SPN_ATC_start [atc_id]

  num_of_STC_sequences [atc_id] indicates the number of STC-sequences on the ATC-sequence pointed to by atc_id.

  offset_STC_id [atc_id] indicates an offset value of sct_id for the first STC-sequence on the ATC-sequence pointed to by atc_id. When a new AV stream file is recorded, offset_STC_id [atc_id] is zero.

  The value of stc_id corresponding to the STC-sequence on the ATC-sequence pointed to by atc_id is defined by the order described by the for-loop of stc_id in the syntax, and the value starts from offset_STC_id [atc_id].

  For two consecutive ATC-sequences defined in SequenceInfo (), stc_id for the last STC-sequence on the preceding ATC-sequence, followed by stc_id for the first STC-sequence on the ATC-sequence May be the same value. If these two stc_ids have the same value, the same STC value does not appear in the two STC-sequences referenced by these values.

  The values of stc_id entered in SequenceInfo () must be arranged in ascending order. Offset_STC_id [atc_id] is set to satisfy this restriction.

  PCR_PID [atc_id] [stc_id] is a PID value of a transport packet having a PCR valid for the STC-sequence pointed to by stc_id on the ATC-sequence pointed to by atc_id.

  SPN_STC_start [atc_id] [stc_id] indicates an address at which the STC-sequence pointed to by stc_id on the ATC-sequence pointed to by atc_id starts on the AV stream file. SPN_STC_start [atc_id] [stc_id] is a size with the source packet number as a unit, and is counted from the first source packet of the AV stream file with zero as an initial value.

  The values of SPN_STC_start [atc_id] [stc_id] entered in SequenceInfo () are arranged in ascending order. The first SPN_STC_start [atc_id] [stc_id] on the ATC-sequence pointed to by atc_id is a value equal to or greater than SPN_ATC_start [atc_id]. That is, the following condition is satisfied.

  SPN_ATC_start [atc_id] ≦ SPN_STC_start [atc_id] [0]

  presentation_start_time [atc_id] [stc_id] indicates the presentation start time of the AV stream data on the STC-sequence pointed to by stc_id on the ATC-sequence pointed to by atc_id. This is a presentation time value in units of 45 kHz derived from the STC of the STC-sequence.

  presentation_end_time [atc_id] [stc_id] indicates the presentation end time of the AV stream data on the STC-sequence pointed to by stc_id on the ATC-sequence pointed to by atc_id. This is a presentation time value in units of 45 kHz derived from the STC of the STC-sequence.

  Next, ProgramInfo () will be described. Since the content program can be configured to include a plurality of elementary streams, only one system time base is shared for synchronous playback of these streams.

  For devices that handle data defined in these data formats, such as the video processing device 11, it is useful to know the contents of the AV stream before decoding the AV stream. This includes, for example, the PID value of transport packets that transmit video and audio elementary streams, and video and audio component types (for example, HDTV video and MPEG-2 AAC audio streams) Information.

  This information is useful for creating menu screens that are displayed to prompt the user to input operations or explain the contents based on the PlayList that references the AV stream, and to decode the AV stream. Prior to this, it is useful for setting the initial state of the AV decoder or the like of the video processing apparatus 11. For this reason, the Clip Information file has ProgramInfo for explaining the contents of the content program.

  In an AV stream file composed of an MPEG2 transport stream, the program content may change in the file. For example, the PID of a transport packet that transmits a video elementary stream may change, or the component type of the video stream may change from SDTV to HDTV.

  That is, ProgramInfo stores information on the change point of the program content in the AV stream file.

  A source packet sequence in which the program content defined by this format is constant in an AV stream file is called a program-sequence.

  In the AV stream file, the address at which a new program-sequence starts is stored in ProgramInfo (). This address is indicated by SPN_program_sequence_start.

  Program-sequences other than the last program-sequence in the AV stream file start from the source packet pointed to by the SPN_program_sequence_start and end at the source packet immediately before the source packet pointed to by the next SPN_program_sequence_start. The last program-sequence starts with the source packet pointed to by SPN_program_sequence_start and ends with the last source packet of the AV stream file.

  FIG. 18 is a diagram for explaining the program-sequence. In this example, the Clip AV stream file has three program-sequences.

  The program-sequence may straddle ATC-sequence boundaries and STC-sequence boundaries.

  FIG. 19 shows the syntax of ProgramInfo () in the first format.

  length indicates the number of bytes from the byte immediately after this length field to the last byte of ProgramInfo ().

  num_of_program_sequences indicates the number of program-sequences in the AV stream file.

  SPN_program_sequence_start indicates an address at which program-sequence starts on the AV stream file. SPN_program_sequence_start has a size with the source packet number as a unit, and is counted from the first source packet of the AV stream file with zero as an initial value. The values of SPN_program_sequence_start entered in ProgramInfo () are arranged in ascending order.

  It is assumed that SPN_program_sequence_start points to the source packet having the first PMT (program map table) for the program-sequence. SPN_program_sequence_start is created by analyzing a PSI / SI (Program Specific Information / Service Information) in a transport stream by a recording device (for example, the video processing device 11) that records data. SPN_program_sequence_start is within a predetermined time from the actual PSI / SI change point because a recording device (for example, video processing device 11) analyzes the PSI / SI and needs a delay time to detect the change. The source packet may be pointed to.

  program_map_PID is the PID value of a transport packet having a PMT applicable to the program-sequence.

  num_of_streams_in_ps indicates the number of elementary streams defined in the program-sequence.

  num_of_groups indicates the number of elementary stream groups defined in the program-sequence. num_of_groups is a value of 1 or more. When the PSI / SI of the transport stream has elementary stream group information, it is assumed that num_of_groups takes a value of 1 or more. Each group constitutes one view in the multi-view program.

  The stream_PID indicates the PID value for the elementary stream defined in the PMT referenced by the program_map_PID of the program-sequence.

  StreamCodingInfo () indicates information of an elementary stream pointed by the stream_PID. StreamCodingInfo () has different configurations for the first format and the second format. The syntax of StreamCodingInfo () between the first format and the second format will be described later with reference to FIGS. 21 and 22.

  num_of_streams_in_group indicates the number of elementary streams that the elementary stream group has.

  The stream_index indicates the value of the stream_index defined by the for-loop in the syntax corresponding to the elementary stream included in the elementary stream group.

  Next, FIG. 20 shows the syntax of ProgramInfo () in the second format.

  In the second format, only one program sequence can be defined in one Clip (that is, one PlayList). The syntax of ProgramInfo () in the second format uses FIG. 19 except that num_of_groups is deleted, the area is reserved_for_future_use, and the description when the value of num_of_groups is 1 or more is deleted Explained. It has the same configuration as the syntax of ProgramInfo () in the first format.

  Next, FIG. 21 shows the syntax of StreamCodingInfo () in the first format.

  length indicates the number of bytes from the byte immediately after this length field to the last byte of StreamCodingInfo ().

  stream_coding_type indicates the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo ().

  Hereinafter, video_format to original_display_aspect_ratio are used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is one of the video streams in stream_coding_type.

  video_format indicates the video format of the video stream pointed to by stream_PID corresponding to this StreamCodingInfo (). For example, 480i, 576i, 480p, 1080i, 720p, and 1080p are described as the video format of the video elementary stream.

  frame_rate indicates the frame rate of the video stream pointed to by stream_PID corresponding to this StreamCodingInfo (). As the frame rate of the video elementary stream, for example, 24000/1001, 24, 25, 30000/1001, 50, and 60000/1001 are described.

  display_aspect_ratio indicates the display aspect ratio of the video stream pointed to by stream_PID corresponding to this StreamCodingInfo (). As aspect ratio information of the video elementary stream, for example, 4: 3 display aspect ratio and 16: 9 display aspect ratio are described.

  cc_flag is a flag indicating whether or not a closed caption data signal is encoded in the video stream pointed to by stream_PID corresponding to this StreamCodingInfo ().

  original_video_format_flag is a flag indicating whether or not original_video_format and original_display_aspect_ratio exist in this StreamCodingInfo ().

  original_video_format is the original video format before the video stream pointed by stream_PID corresponding to this StreamCodingInfo () is encoded.

  original_display_aspect_ratio is the original display aspect ratio before the video stream pointed by stream_PID corresponding to this StreamCodingInfo () is encoded.

  As described above, in the first format, in the video stream, the main video stream is not clearly distinguished from subtitles and PG.

  When transcoding a transport stream in which a multimedia data stream (for example, a BML stream or subtitle) is multiplexed together with a video stream corresponding to a main video, the video stream is re-encoded to Consider the case where the video format changes (eg, changes from 1080i to 480i) but the multimedia data stream keeps the original stream.

  At this time, an information mismatch may occur between the new video stream and the multimedia data stream. For example, although the parameters related to the display of the multimedia data stream are determined assuming the video format of the original video stream, the video format is changed by re-encoding of the video stream.

  In such a case, information about the original video stream is stored in original_video_format and original_display_aspect_ratio. The playback device creates a display image from the new video stream and multimedia data stream as follows.

  The video stream is up-sampled to a video format indicated by original_video_format and original_display_aspect_ratio. The up-sampled image and the multimedia data stream are combined to create a correct display image.

  Audio_presentation_type and sampling_frequency are used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is one of audio streams.

  audio_presentation_type indicates the presentation type of the audio stream pointed by stream_PID corresponding to this StreamCodingInfo (). As presentation type information of an audio elementary stream, for example, single mono channel, dual mono channel, stereo (2-channel), and multi-channel are described.

  Sampling_frequency indicates the sampling frequency of the audio stream pointed by stream_PID corresponding to this StreamCodingInfo (). For example, 48 kHz and 96 kHz are described as the sampling frequency of the audio elementary stream.

  Next, FIG. 22 shows the syntax of StreamCodingInfo () in the second format.

  length indicates the number of bytes from the byte immediately after this length field to the last byte of StreamCodingInfo ().

  stream_coding_type indicates the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo (). As the encoding type of the elementary stream, for example, MPEG-2 video stream, MPEG-4 AVC video stream, VC-1 video stream, HDMV LPCM audio stream, Dolby AC-3 audio stream, dts audio stream, Presentation graphics stream, Interactive graphics stream, Text subtitle stream, etc. are described.

  Hereinafter, video_format to cc_flag are used when the encoding type of the elementary stream pointed to by stream_PID corresponding to this StreamCodingInfo () is one of the video streams in stream_coding_type. Since it is the same as the case of the first format explained using, the detailed explanation is omitted.

  That is, in the syntax of StreamCodingInfo () in the second format, unlike the first format, subtitles (text subtitle stream) are used in addition to the video stream and audio stream corresponding to the main video as the encoding type of the elementary stream. ), PG, and IG are clearly distinguished, so there is no need to define original_video_format_flag.

  Then, audio_presentation_type, sampling_frequency, and audio_language_code are used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is one of audio streams. Since audio_presentation_type and sampling_frequency are the same as those in the first format described with reference to FIG. 21, detailed description thereof is omitted. audio_language_code indicates a language code (for example, Japanese, Korean, Chinese, etc.) supported by the audio stream pointed to by stream_PID corresponding to this StreamCodingInfo ().

  As described above, in the syntax of StreamCodingInfo () in the second format, the main video / video stream and other subtitles (text subtitle stream), PG, and IG are clearly distinguished.

  PG_language_code is used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is presentation graphics, and the language code (for example, Japanese, Korean, Chinese, etc.)

  IG_language_code is used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is interactive graphics, and the language code (for example, Japanese, Korean, Chinese, etc.)

  character_code and textST_language_code are used when the encoding type of the elementary stream pointed by stream_PID corresponding to this StreamCodingInfo () is a text subtitle (text subtitle).

  character_code indicates the character code of the text subtitle elementary stream. For example, Unicode V1.1 (ISO 10646-1), Shift JIS (Japanese), KSC 5601-1987 including KSC 5653 for Roman character (Korean), GB 18030-2000 (Chinese) ), GB2312 (Chinese), and BIG5 (Chinese).

  The character_code indicates the language code (for example, Japanese, Korean, Chinese, etc.) supported by the text subtitle stream.

  Next, the structure of the PlayList in the first format and the second format will be described.

  The syntax format of the PlayList is different between the first format and the second format. Although the details are omitted here, for example, in the first format assuming the case of recording a video signal, many areas for storing information corresponding to so-called metadata included in the broadcast signal are defined as Syntax. However, in the second format, an area for storing such information is not defined. Since the menu using the PG cannot be displayed in the content program in the first format, the menu by the navigation program cannot be displayed using such information. For example, the content in the first format The present invention can be used to create a menu screen by a program uniquely used in an apparatus for recording or reproducing a program.

  The conversion processing unit 39 of the video processing apparatus 11 described with reference to FIG. 1 performs format conversion of data between the first format and the second format described above based on the control of the control unit 31. .

  FIG. 23 is a functional block diagram illustrating functions of the conversion processing unit 39.

  The conversion processing unit 39 includes a format type detection unit 111, a user presentation information generation unit 112, a data and control information acquisition unit 113, a stream data conversion unit 114, a ClipInfo file conversion unit 115, a PlayList file conversion unit 116, and an Index file conversion unit 117. The stream data conversion unit 114 includes an ATC sequence number detection unit 131, a program sequence number detection unit 132, a stream segmentation unit 133, and a stream combination unit 134. It consists of

  The format type detection unit 111 uses a predetermined method to record one or a plurality of predetermined transport streams composed of content programs (here, PlayList and Clip, and corresponding navigation programs) recorded in the local storage 36. Determine the format type of each data by checking the Format_Identifier and Stream_format_name of TS_type_info_block () from ClipInfo () of the content program or simply called a program) Then, the discriminated format type is supplied to the user presentation information generation unit 112, and the format_identifier and the Stream_format_name of the TS_type_info_block () are obtained from the ClipInfo () of the data subjected to format conversion acquired by the data and control information acquisition unit 113. Check The type of each data format is discriminated, and the discriminated format type is supplied to the data and control information acquisition unit 113.

  The user presentation information generation unit 112 detects a content program that can be format-converted based on the format type of the content program recorded in the local storage 36 supplied from the format type detection unit 111, and the content program Information related to the PlayList is presented to the user, and data corresponding to the display screen is generated to assist the user in selecting data to be subjected to format conversion, supplied to the display control unit 43, and displayed. .

  Based on the control of the control unit 31, the data and control information acquisition unit 113 acquires data of a content program whose format conversion is instructed by a user operation input from among the content programs recorded in the local storage 36, The transport stream data and information such as a ClipInfo file and a PlayList file necessary for conversion of the transport stream data are supplied to the stream data conversion unit 114, the ClipInfo file is supplied to the ClipInfo file conversion unit 115, and the PlayList file Are supplied to the PlayList file conversion unit 116, and the Index file is supplied to the Index file conversion unit 117.

  The stream data conversion unit 114 performs a process of converting the transport stream supplied from the data and control information acquisition unit 113 and supplies the converted data to the converted data storage control unit 118.

  The ATC sequence number detection unit 131 is defined in one ClipInfo (in other words, one PlayList) supplied from the data and control information acquisition unit 113 at the time of format conversion from the first format to the second format. The number of ATC sequences included in the transport stream is detected with reference to num_of_ATC_sequences of SequenceInfo (), and is supplied to the stream dividing unit 133.

  The program sequence number detection unit 132 is defined in one ClipInfo (in other words, one PlayList) supplied from the data and control information acquisition unit 113 at the time of format conversion from the first format to the second format. The number of program sequences included in the transport stream is detected with reference to num_of_program_sequences of ProgramInfo () and supplied to the stream dividing unit 133.

  Here, the ATC sequence number detection unit 131 refers to the num_of_ATC_sequences of SequenceInfo () for the number of ATC sequences included in the transport stream defined in one ClipInfo (in other words, one PlayList). The program sequence number detection unit 132 detects the number of program sequences included in the transport stream defined in one ClipInfo with reference to num_of_program_sequences of ProgramInfo (). The sequence number detection unit 131 and the program sequence number detection unit 132 may detect the number of sequences based on different information. Specifically, for example, the ATC sequence number detection unit 131 may detect the number of ATC sequences based on the ATC continuity based on the ATS associated with the stream, for example, The program sequence number detection unit 132 may detect the number of program sequences based on time information indicating program change points.

  The stream dividing unit 133 performs data and control based on the detection result of the number of ATC sequences supplied from the ATC sequence number detection unit 131 and the detection result of the number of program sequences supplied from the program sequence number detection unit 132. The transport stream supplied from the information acquisition unit 113 is divided, and the divided data is supplied to the post-conversion data storage control unit 118.

  The stream combining unit 134 has more than 200 transport stream files defined in one ClipInfo (in other words, one PlayList) during format conversion from the second format to the first format. In this case, or when the user is instructed to combine the files at the time of format conversion, the data and the transport stream supplied from the control information acquisition unit 113 are combined, and the combined data is converted into the post-conversion data storage control unit 118. To supply.

  The ClipInfo file conversion unit 115 executes processing for converting the ClipInfo file supplied from the data and control information acquisition unit 113, and supplies the converted data to the converted data storage control unit 118.

  The PlayList file conversion unit 116 executes processing for converting the PlayList file supplied from the data and control information acquisition unit 113, and supplies the converted data to the converted data storage control unit 118.

  The index file conversion unit 117 executes processing for converting the index file supplied from the data and control information acquisition unit 113 and supplies the converted data to the converted data storage control unit 118.

  The post-conversion data storage control unit 118 includes a transport stream after conversion supplied from the stream division unit 133 or the stream combination unit 134, a post-conversion ClipInfo file supplied from the ClipInfo file conversion unit 115, and a PlayList file conversion unit. Based on the converted PlayList file supplied from 116 and the converted Index file supplied from the Index file conversion unit 117, a content program corresponding to the converted format is generated, and the converted format is supported. The storage of the content program to be stored in the local storage 36 is controlled.

  Next, a data conversion process executed by the video processing apparatus 11 will be described with reference to a flowchart of FIG.

  In step S <b> 1, the control unit 31 determines whether or not an instruction to start the format conversion process has been received based on information representing the user's operation input supplied from the operation input acquisition unit 40. If it is determined in step S1 that a command to start format conversion processing has not been received, the processing in step S1 is repeated until it is determined that a command to start format conversion processing has been received.

  That is, the control unit 31 is based on the information representing the operation input of the user supplied from the operation input acquisition unit 40, except for data conversion processing such as reception of broadcast signals and reproduction of content recorded on the optical disc 12. While waiting for the input of the command for starting the format conversion process, the control of the process is executed as necessary.

  If it is determined in step S1 that the format conversion processing start command has been received, the control unit 31 commands the conversion processing unit 39 to start the format conversion processing in step S2. The format type detection unit 111 of the conversion processing unit 39 determines the format type of each data by checking the Format_Identifier and Stream_format_name of TS_type_info_block () from ClipInfo () of the content program recorded in the local storage 36. Then, the discriminated format type is supplied to the user presentation information generation unit 112. The user presentation information generation unit 112 detects a content program that can be converted based on the type of the format of the content program recorded in the local storage 36 supplied from the format type detection unit 111, and can convert the format. Data corresponding to the display screen is generated to assist the user to select data to be subjected to format conversion by extracting a correct PlayList, supplied to the display control unit 43, displayed, and presented to the user To do.

  In step S <b> 3, the control unit 31 determines whether or not a PlayList to be format-converted has been received based on information representing the user's operation input supplied from the operation input acquisition unit 40. If it is determined in step S3 that the PlayList to be format converted has not been selected, the process of Step S3 is repeated until it is determined that the PlayList to be format converted has been selected.

  If it is determined in step S3 that a PlayList to be format-converted has been selected, the control unit 31 notifies the conversion processing unit 39 of the selected PlayList in step S4. The data and control information acquisition unit 113 of the conversion processing unit 39 identifies the Clip (ClipInfo and stream data) corresponding to the PlayList to be format-converted, and the content program data for which format conversion is commanded from the local storage 36 , The transport stream data, and the ClipInfo file and PlayList file necessary for converting the transport stream are supplied to the stream data conversion unit 114, the ClipInfo file is supplied to the ClipInfo file conversion unit 115, The PlayList file is supplied to the PlayList file conversion unit 116, and the Index file is supplied to the Index file conversion unit 117.

  In step S5, the stream data conversion unit 114 determines whether the conversion process to be executed is a conversion process from the first format to the second format. If it is determined in step S5 that the conversion process is not the conversion from the first format to the second format, that is, the conversion process from the second format to the first format, the process is step S10 described later. Proceed to

  When it is determined in step S5 that the conversion process is from the first format to the second format, in step S6, the stream conversion process to the second format, which will be described later using the flowchart of FIG. 25, is executed. Is done.

  In step S7, the ClipInfo file conversion unit 115 changes the portion related to the ClipInfo program sequence and the ATC sequence according to the stream conversion contents as necessary. Specifically, when the stream is divided into a plurality of streams in the stream conversion process to the second format executed in step S6, the ClipInfo file conversion unit 115 divides the part related to the program sequence and the ATC sequence. Modify or generate ClipInfo as described to correspond to each of the streams.

  In step S8, the ClipInfo file conversion unit 115 converts the ClipInfo corresponding to the number of stream divisions changed or generated in step S7 into the second format, and converts the converted data into a converted data storage control unit. 118.

  In step S9, the PlayList file conversion unit 116 converts or generates the PlayList into the second format so as to correspond to the division of the stream, and supplies the converted data to the converted data storage control unit 118. The process proceeds to step S14 described later.

  If it is determined in step S5 that the conversion process is not the conversion process from the first format to the second format, that is, the conversion process from the second format to the first format, the process in FIG. A stream conversion process to the first format, which will be described later using a flowchart, is executed.

  In step S11, the ClipInfo file conversion unit 115 changes the portion related to the ClipInfo program sequence and the ATC sequence in accordance with the stream conversion as necessary. Specifically, in the stream conversion process to the first format executed in step S10, the ClipInfo file conversion unit 115 generates a ClipInfo file corresponding to the combined multiple streams when the multiple streams are combined. Based on this, the ClipInfo file is converted so as to correspond to the combined stream.

  In step S12, the ClipInfo file conversion unit 115, when the plurality of streams are combined in the stream conversion process to the first format executed in step S10, the ClipInfo corresponding to the combined stream is changed to the first format. The data is converted into a format, and the converted data is supplied to the converted data storage control unit 118.

  In step S13, the PlayList file conversion unit 116, in the stream conversion process to the first format executed in step S10, when a plurality of streams are combined, the PlayList is converted so that the combined streams can be reproduced. Then, the data is converted into the first format, and the converted data is supplied to the converted data storage control unit 118.

  After the process of step S9 or step S13 is completed, in step S14, the Index file conversion unit 117 generates and generates an Index.bdmv file in which the converted PlayList is sequentially played back as necessary. The new Index.bdmv file is supplied to the post-conversion data storage control unit 118.

  In step S15, the post-conversion data storage control unit 118 uses the stream data conversion unit 114, the ClipInfo file conversion unit 115, the PlayList file conversion unit 116, and the index file conversion unit 117 based on the data converted or generated, respectively. Then, a content program corresponding to the converted format is generated, the file group included in the content program of the new format is stored in an appropriate storage area of the local storage 36, and the process is terminated.

  By such processing, the content program data desired by the user is converted in format.

  Next, the stream conversion process to the second format executed in step S6 of FIG. 24 will be described with reference to the flowchart of FIG.

  In step S41, the program sequence number detection unit 132 of the stream data conversion unit 114 refers to num_of_program_sequences of ProgramInfo () and supplies one ClipInfo (in other words, one PlayList) supplied from the data and control information acquisition unit 113. The number of program sequences included in stream data to be format-converted defined in (1) is extracted.

  In step S42, the program sequence number detection unit 132 determines whether the number of program sequences included in the corresponding stream data is two or more. In step S42, when it is determined that the number of program sequences included in the corresponding stream data is not 2 or more, that is, the process proceeds to step S45 described later.

  When it is determined in step S42 that the number of program sequences included in the corresponding stream data is 2 or more, in step S43, the program sequence number detection unit 132 determines the number of program sequences included in the corresponding stream data. The position is notified to the stream dividing unit 133. The stream dividing unit 133 analyzes the vicinity of the boundary of the program sequence and detects PMT discontinuity points.

  In step S44, the stream dividing unit 133 divides the stream at an appropriate position before the boundary of the detected PMT discontinuity point.

  If it is determined in step S42 that the number of program sequences included in the corresponding stream data is not 2 or more, that is, 1 or after the processing of step S44 is completed, the number of ATC sequences is detected in step S45. The unit 131 refers to num_of_ATC_sequences of SequenceInfo (), and converts the stream data that is defined in one ClipInfo (in other words, one PlayList) supplied from the data and control information acquisition unit 113 into the format-converted stream data. Extract the number of ATC sequences included.

  In step S46, the ATC sequence number detection unit 131 determines whether or not the number of ATC sequences included in the corresponding stream data is two or more.

  If it is determined in step S46 that the number of ATC sequences included in the corresponding stream data is 2 or more, in step S47, the ATC sequence number detector 131 determines the number of ATC sequences included in the corresponding stream data. The position is notified to the stream dividing unit 133. The stream dividing unit 133 divides the stream at the boundary portion of the ATC sequence, supplies the divided data to the converted data storage control unit 118, and the process returns to step S6 in FIG. move on.

  In step S46, if it is determined that the number of ATC sequences included in the corresponding stream data is not two or more, that is, one, each piece of data divided based on the number of program sequences, or not at all The undivided data is supplied to the post-conversion data storage control unit 118, and the process returns to step S6 in FIG. 24 and proceeds to step S7.

  By such processing, the transport stream data of the first format as the conversion source is divided based on the number of program sequences and the number of ATC sequences so that the second format after conversion is not violated. The

  Next, the stream conversion process to the first format executed in step S10 of FIG. 24 will be described with reference to the flowchart of FIG.

  In step S71, the stream combination unit 134 of the stream data conversion unit 114 extracts the number of transport stream files defined in one ClipInfo (in other words, one PlayList) from the converted data. .

  In step S72, the stream combining unit 134 determines whether the number of transport stream files is 200 or more. If it is determined in step S72 that the number is 200 or more, the process proceeds to step S74 described below.

  If it is determined in step S72 that the number is not 200 or more, in step S73, the stream combination unit 134 receives a transformer from the user based on the data supplied from the control unit 31 via the data and control information acquisition unit 113. It is determined whether or not port stream file combination is instructed.

  If it is determined in step S72 that the number is 200 or more, or if it is determined in step S73 that the combination of transport stream files has been commanded, in step S74, the stream combining unit 134 determines the transport stream to be combined. The files are identified, combined, and the combined data is supplied to the post-conversion data storage control unit 118, and the process returns to step S10 in FIG. 24 and proceeds to step S11.

  In step S73, when it is determined that the transport stream file combination is not instructed, the stream combining unit 134 supplies the uncombined data as it is to the converted data storage control unit 118. Returning to step S10 of FIG. 24, the process proceeds to step S11.

  In order to reduce the number of files so that the transport stream data of the second format as the conversion source does not violate the regulations of the first format after the conversion, or based on the user's command by such processing. Combined.

  Through the processing described above, the video processing apparatus 11 converts the format of the content program recorded in the first format into the second format, or changes the format of the content program recorded in the second format to the first format. It becomes possible to change to the format of 1.

  For example, a content program recorded in the first format cannot have a menu by IG. Therefore, by converting the content program recorded in the first format into the second format, the user can attach the menu by IG to the content program and reproduce it.

  Further, as described above, the second format is a format that is very compatible with the format for playback-only removable media, so the content program recorded in the first format is changed to the second format. By converting, the playback environment of the content program is expanded.

  Further, for example, when a plurality of content programs are to be edited or organized together, the formats of the plurality of content programs may be mixed. When many of them are recorded in the first format, the mixed format is unified by performing format conversion from the second format to the first format, and the content program can be easily edited or It becomes possible to arrange.

  The series of processes described above can be executed by hardware or can be executed by software. In this case, the processing described above is executed by a personal computer 200 as shown in FIG.

  27, a CPU (Central Processing Unit) 201 performs various processes according to a program stored in a ROM (Read Only Memory) 202 or a program loaded from a storage unit 208 to a RAM (Random Access Memory) 203. Execute. The RAM 203 also appropriately stores data necessary for the CPU 201 to execute various processes.

  The CPU 201, ROM 202, and RAM 203 are connected to each other via an internal bus 204. An input / output interface 205 is also connected to the internal bus 204.

  The input / output interface 205 includes an input unit 206 such as a keyboard and a mouse, a display such as a CRT and LCD, an output unit 207 such as a speaker, a storage unit 208 including a hard disk, a modem, a terminal adapter, etc. A communication unit 209 is connected. The communication unit 209 performs communication processing via various networks including a telephone line and CATV. The communication unit 209 may include an antenna and the like and can receive a broadcast signal.

  A drive 210 is connected to the input / output interface 205 as necessary, and a removable medium 211 made of a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is appropriately mounted, and a computer program read from them is loaded. Installed in the storage unit 208 as necessary.

  Furthermore, when the content data (program composed of a navigation program, PlayList, and Clip) is recorded on the removable medium 211, the program read from the removable medium 211 is stored in the storage unit 208. The format can be converted or reproduced by the processing of the CPU 201.

  The decoding or encoding process executed by the re-encoding processing unit 34 or the AV decoder unit 42 of FIG. 1 may be executed by the CPU 201 (so-called software codec), or the re-encoding processing unit 34 of FIG. A codec processing unit having a function corresponding to the encoding processing unit 34 or the AV decoder unit 42 may be newly provided.

  When the above-described series of processing is executed by software, a program constituting the software is installed from a network or a program storage medium.

  As shown in FIG. 27, the program storage medium is configured only by a package medium including a removable medium 211 on which a program is recorded, which is distributed to provide a program to the user, separately from the computer. Rather, it is provided with a ROM 202 storing a program and a hard disk including a storage unit 208, which is provided to the user in a state of being incorporated in the apparatus main body in advance.

  In the present specification, the step of describing a computer program includes not only processing performed in time series according to the described order but also processing executed in parallel or individually even if not necessarily processed in time series. Is also included.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a block diagram which shows the structure of a video processing apparatus. It is a figure for demonstrating the recorder model of an MPEG2 transport stream. It is a figure for demonstrating the application format of the data handled in a video processing apparatus. FIG. 3 is a diagram for explaining the structure of an AV stream file. It is a figure which shows the syntax of a source packet. It is a figure which shows the syntax of TP_extra_header. It is a figure for demonstrating the difference between a 1st format and a 2nd format. It is a figure for demonstrating format conversion with a 1st format and a 2nd format. It is a figure for demonstrating the relationship between the number of ATC sequences and the number of Clips in each format. It is a figure for demonstrating the relationship between the number of ATC sequences in each format, an STC sequence, and the number of program sequences, and the number of Clips. It is a figure which shows the syntax of Clip Information file. It is a figure which shows the syntax of TS_type_info_block (). It is a figure for demonstrating ATC-sequence. It is a figure for demonstrating the relationship between the discontinuous point of ATC, and ATC-sequence. It is a figure for demonstrating a continuous STC area. FIG. 3 is a diagram for explaining the relationship between STC discontinuity points and STC-sequences, and the relationship between STC-sequences and ATC-sequences. It is a figure which shows the syntax of SequenceInfo (). It is a figure for demonstrating program-sequence. It is a figure which shows the syntax of ProgramInfo () in a 1st format. It is a figure which shows the syntax of ProgramInfo () in a 2nd format. It is a figure which shows the syntax of StreamCodingInfo () in a 1st format. It is a figure which shows the syntax of StreamCodingInfo () in a 2nd format. It is a functional block diagram which shows the function which a conversion process part has. It is a flowchart for demonstrating a data conversion process. It is a flowchart for demonstrating the stream conversion process to a 2nd format. It is a flowchart for demonstrating the stream conversion process to a 1st format. It is a block diagram which shows the structure of a personal computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Image processing apparatus 12 Optical disk, 31 Control part, 32 Antenna, 33 Broadcast reception control part, 35 Data recording processing part, 36 Local storage, 37 Disk drive, 38 Network interface, 39 Conversion processing part, 40 Operation input acquisition part, 41 AV decoder unit, 111 format type detection unit, 112 user presentation information generation unit, 113 data and control information acquisition unit, 114 stream data conversion unit, 115 ClipInfo file conversion unit, 116 PlayList file conversion unit, 117 Index file conversion unit, 118 Data conversion control unit after conversion, 131 ATC sequence number detection unit, 132 Program sequence number detection unit, 133 Stream division unit, 134 Stream combination unit

Claims (7)

In an information processing apparatus that executes format conversion of a content program configured to include a transport stream, entity management information for managing the entity of the transport stream, and reproduction management information for managing reproduction of the transport stream,
Acquisition means for acquiring first information relating to a time axis of the transport stream and second information relating to a change in the content program content, which are included in the entity management information in the content program in a first format; ,
Splitting means for splitting the transport stream based on the first information or the second information acquired by the acquiring means;
An information processing apparatus comprising: generating means for generating the content program in a second format including the transport stream divided by the dividing means. The first information included in the entity management information is information based on counter information corresponding to a time when the transport stream is acquired,
In the transport stream, a portion where the counter information has continuity is managed as one sequence,
The first format is capable of managing a plurality of sequences using one entity management information.
The second format is configured such that only one sequence can be managed using one entity management information,
The acquisition means detects the number of sequences constituting the transport stream managed by the entity management information based on the first information,
2. The information according to claim 1, wherein, when the transport stream managed by the entity management information is composed of a plurality of sequences, the dividing unit divides the transport stream so as to be one sequence at a time. Processing equipment In the transport stream, one part of the transport stream divided by the change point is managed as one sequence,
The first format is capable of managing a plurality of sequences using one entity management information.
The second format is configured such that only one sequence can be managed using one entity management information,
The acquisition means detects the number of sequences constituting the transport stream managed by the entity management information based on the second information,
2. The information according to claim 1, wherein, when the transport stream managed by the entity management information is composed of a plurality of sequences, the dividing unit divides the transport stream so as to be one sequence at a time. Processing equipment. The first information included in the entity management information is information based on counter information corresponding to a time when the transport stream is acquired,
In the transport stream, a portion in which the counter information has continuity is managed as one sequence in the first sequence, and one portion of the transport stream divided by the change point is in the second sequence. Managed as a sequence,
The first format can manage a plurality of sequences in both the first sequence and the second sequence using one entity management information,
The second format is configured such that only one sequence can be managed in each of the first sequence and the second sequence using one entity management information.
The acquisition means detects the number of sequences of the first sequence constituting the transport stream managed by the entity management information based on the first information, and based on the second information , Detecting the number of sequences of the second sequence constituting the transport stream managed by the entity management information,
When the transport stream managed by the entity management information is composed of a plurality of sequences in at least one of the first sequence and the second sequence, the dividing means The information processing apparatus according to claim 1, wherein the transport stream is divided so that one sequence is included in each of the sequence and the second sequence. Information processing of an information processing apparatus that executes format conversion of a content program including a transport stream, entity management information for managing the entity of the transport stream, and reproduction management information for managing reproduction of the transport stream In the method
Obtaining first information relating to the time axis of the transport stream and second information relating to a change in content program content included in the entity management information in the content program in the first format;
Dividing the transport stream based on the acquired first information or the second information;
An information processing method including a step of generating a content program of a second format including the divided transport stream. A program for causing a computer to execute format conversion processing of a content program including a transport stream, entity management information for managing the entity of the transport stream, and reproduction management information for managing reproduction of the transport stream. And
Controlling the acquisition of the first information regarding the time axis of the transport stream and the second information regarding the change point of the content program content included in the entity management information in the content program of the first format;
Dividing the transport stream based on the first information or the second information whose acquisition is controlled;
A program that causes a computer to execute a process including a step of generating a content program of a second format including the divided transport stream.   A program storage medium in which the program according to claim 6 is recorded.

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