JP2009130757A - Content data conversion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform conversion processing of contents by generating stream attribute information data relating to converted stream data without analyzing elementary data contained in the converted stream data. <P>SOLUTION: In a content data conversion apparatus, a conversion packet generating section 114 generates a packet constituting converted stream data that are data obtained by coupling a packet header produced in a packet form after conversion to elementary data for a designated size, and outputs the generated packet to a converted stream data buffer 116. On the basis of a packet offset number of non-converted stream data constituent packet, a converted stream attribute information data updating instruction section 118 uses packet elementary attribute information data acquired from a non-converted stream attribute information data memory 106 and the packet offset number, obtained from a packet counter 117, of the converted stream data constituent to produce packet elementary attribute information data of the converted stream data constituent packet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a content data conversion apparatus, and more particularly to a content data conversion apparatus that converts video and audio content composed of stream data and stream attribute information data related to the stream data into video and audio content of different data formats.

  In recent years, in various devices such as digital still cameras, digital video cameras, video recorders, personal computers (hereinafter referred to as personal computers), DVD (Digital Versatile Disc), HD-DVD, Blu-ray Disc, SD (Secure Digital) memory Audio / video content can be recorded and reproduced on various recording media such as cards. In general, video / audio contents recorded on these various recording media describe video / audio stream data obtained by multiplexing elementary data, which are individual video and audio data, and attribute information of the video / audio stream data. The stream attribute information data is composed of two types of data. However, the data format of the video / audio stream data constituting the video / audio content and the stream attribute information data related to the video / audio stream data is different for each type of recording medium and for each logical format.

  Typical information included in the stream attribute information data is map information. This concept of map information is necessary for performing random access reproduction such as high-speed reproduction and chapter search, and is adopted in various logical formats.

  FIG. 16 shows an example of map information. In the stream attribute information data shown in FIG. 16A, the map information includes the first data byte of the video frame shown in FIG. 16B as the map information from the beginning of the stream data in the stream data shown in FIG. One or more packet elementary attribute information data in which the packet offset number SPN is associated with the display time PTS of the picture of the video frame is included. In addition to the map information, the stream attribute information data includes information indicating the change point of the video / audio elementary data.

  The data format of such stream attribute information data often differs depending on the logical format. When video / audio content is converted into a different logical format and recorded, it is necessary to create stream attribute information data in a data format according to the converted logical format.

  For example, a method of converting stream attribute information data at the time of dubbing or the like has been conventionally disclosed (for example, see Patent Document 1). This Patent Document 1 discloses a method for generating management information of an appropriate format for various recording media having different formats of management information without analyzing the data stream and transferring the management information together with the data stream. It is disclosed.

JP 2006-140992 A

  However, when video / audio content is converted into a different logical format and recorded, not only conversion of stream attribute information data but also conversion of video / audio stream data may be required. Also, in this video / audio stream data conversion processing, there is a case where only the multiplexing / packet format is changed without changing the data format of elementary data which is individual video / audio data in the video / audio stream data. . As typical examples, conversion processing from MPEG-2 (Moving Picture Experts Group 2) standard PS (Program Stream) to MPEG-2 standard TS (Transport Stream), and MPEG- 2 Conversion processing from TS to MPEG-2 PS is mentioned.

  In general, the stream attribute information data specifies the position in the stream data by the packet offset number SPN or the like from the beginning of the stream data as shown in FIG. 16, so when the packet format is changed in the stream data conversion process, The stream attribute information data related to the stream data before conversion becomes meaningless with respect to the stream data after conversion. Therefore, in order to generate stream attribute information data related to converted stream data, elementary data included in the converted stream data must be analyzed, and the conversion process is complicated.

  The present invention has been made in view of the above points, and can generate stream attribute information data related to converted stream data without analyzing elementary data included in the converted stream data. An object is to provide a content data conversion apparatus.

In order to achieve the above object, a content data conversion apparatus according to a first aspect of the present invention provides first stream data composed of packets of the first packet format and information used when reproducing the first stream data. Content data composed of first stream attribute information data that is at least data including the second stream data composed of packets of a second packet format different from the first packet format and the second stream data A content data conversion device for converting into content data composed of second stream attribute information data that is data including at least information used when reproducing stream data,
Input means for inputting first stream data and first stream attribute information data, first buffering means for temporarily storing first stream data input by the input means, and input by input means Video data and audio included in each packet constituting the first stream data output from the first storage means for temporarily storing the first stream attribute information data to be output and the first buffering means Extracting and temporarily storing elementary data that is at least one of the data, and sequentially outputting the elementary data by a predetermined size that can be inserted into a packet of the second packet format. The second parameter is added to elementary data of a predetermined size sequentially output from the buffering means and the second buffering means. Packet generating means for sequentially generating packets constituting the second stream data by combining the header portions of the packet format, and the first packet which is a packet offset number from the first packet of the first stream data Elementary data follow-up means for obtaining an offset number and a second packet offset number that is a packet offset number from the first packet of the second stream data, and the first packet offset number based on the first packet offset number. First packet elementary attribute information data, which is attribute information data for each packet, included in the first stream attribute information data stored in the storage means is acquired, and this first packet elementary attribute is further acquired. The second stream data using the information data and the second packet offset number Packet elementary attribute information data generating means for generating second packet elementary attribute information data corresponding to each packet, and temporarily storing each packet constituting the second stream data generated by the packet generating means Temporarily storing second stream attribute information data composed of third buffering means and one or more second packet elementary attribute information data generated by the packet elementary attribute information data generating means. And second storage means.

  In order to achieve the above object, a content data conversion apparatus according to a second aspect of the present invention includes an input means for inputting first stream data and first stream attribute information data, and a first input by the input means. The first buffering means for temporarily storing the stream data, the first storage means for temporarily storing the first stream attribute information data inputted by the input means, and the first buffering means Extracting and temporarily storing elementary data, which is at least one of video data and audio data, included in each packet constituting the first stream data to be output, Second buffering means for sequentially outputting a predetermined size that can be inserted into a packet of the second packet format; and a second buffer The header part of the second packet format is combined with elementary data of a predetermined size sequentially output from the ring means to sequentially generate each packet constituting the second stream data, and second stream attribute information Mixed stream data for generating mixed stream data by mixing second packet elementary attribute information data, which is attribute information data for each packet, included in the data and each packet constituting the second data stream Generating means, a first packet offset number that is a packet offset number from the first packet of the first stream data, and a second packet offset number that is a packet offset number from the first packet of the mixed stream data Elementary data follow-up means to be acquired, and first Based on the packet offset number, first packet elementary attribute information data, which is attribute information data for each packet, included in the first stream attribute information data stored in the first storage means is acquired. Further, by using the first packet elementary attribute information data and the second packet offset number, second packet elementary attribute information data corresponding to each packet of the mixed stream data is generated to generate mixed stream data. Packet elementary attribute information data generating means for outputting to the means, third buffering means for temporarily storing each packet constituting the mixed stream data generated by the mixed stream data generating means, and third buffering External output means for outputting the mixed stream data stored in the means to the outside It is characterized by having.

  In the first and second inventions, the first packet offset number that is the packet offset number from the first packet of the first stream data and the packet offset number that is the packet offset number from the first packet of the second stream data. 2, and the second packet of each packet constituting the second stream data is obtained by using the first packet elementary attribute information data and the second packet offset number. Since the elementary attribute information data is generated and output, the stream attribute information data related to the converted stream data can be generated without analyzing the second stream data.

  According to the present invention, content data composed of first stream data and first stream attribute information data is composed of second stream data and second stream attribute information data in different data formats. When converting to data, the second stream attribute information data can be generated without analyzing the second stream data.

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

(First embodiment)
FIG. 1 shows a block diagram of a first embodiment of a content data conversion apparatus according to the present invention. The content data conversion apparatus 100 according to the present embodiment includes a recording medium playback apparatus 101, a recording medium recording apparatus 102, an operation unit 103 that operates the recording medium playback apparatus 101 and the recording medium recording apparatus 102, a stream data buffer 104 before conversion, and a packet. Counter 105, pre-conversion stream attribute information data memory 106, filter 107, conversion stream generation processing command unit 108, state memory 109 for storing information regarding the state in a series of conversion processing, elementary data buffers 110 and 112, address memory 111 and 113, a converted packet generation unit 114, a newly inserted packet generation unit 115, a converted stream data buffer 116, a packet counter 117, a converted stream attribute information data update command unit 118, and a converted stream attribute information data Composed of a memory 119.

  The recording medium playback apparatus 101 has a function of sequentially playing the pre-conversion stream data recorded on the recording medium 121 from the beginning of the file and supplying the pre-conversion stream data to the pre-conversion stream data buffer 104, and pre-conversion stream attribute information related to the pre-conversion stream data A function of reproducing data from the recording medium 121 and supplying it to the pre-conversion stream attribute information data memory 106.

  The pre-conversion stream data buffer 104 is buffering means having a function of temporarily storing pre-conversion stream data output from the recording medium playback apparatus 101 and outputting the pre-conversion stream data to the filter 107 in units of packets. For convenience of explanation, each pre-conversion stream data output in units of packets is referred to as a pre-conversion stream data configuration packet. The packet counter 105 provided in the pre-conversion stream data buffer 104 has a function of counting the total number of pre-conversion stream data constituent packets output to the filter 107 from the start of a series of conversion processes. The pre-conversion stream attribute information data memory 106 temporarily stores the pre-conversion stream attribute information data output from the recording medium playback apparatus 101, and has a function of outputting to the post-conversion stream attribute information data update command unit 118 It is.

  The filter 107 extracts only elementary data from each packet of the pre-conversion stream data constituting packet output from the pre-conversion stream data buffer 104, and extracts based on the identifier described in the header part of each packet head It has a function of determining which of the elementary data is to be output to the elementary data buffers 110 and 112 and outputting the extracted elementary data to the determined elementary data buffer.

  The conversion stream generation processing instruction unit 108 has a function of issuing processing instructions to the elementary data buffers 110 and 112, the conversion packet generation unit 114, and the newly inserted packet generation unit 115, respectively. The elementary data buffers 110 and 112, the conversion packet generation unit 114, and the newly inserted packet generation unit 115 receive the processing instruction issued from the conversion stream generation processing instruction unit 108, and the conversion stream generation processing instruction unit 108 requests it. Process.

  The elementary data buffers 110 and 112 are buffering means for temporarily storing the elementary data extracted by the filter 107, and receive and store the processing command from the converted stream generation processing command unit 108. It has a function of dividing elementary data into a specified size (a size that can be put in one packet of the converted packet format) and outputting it to the converted packet generator 114.

  In addition, the elementary data buffers 110 and 112 are provided with address memories 111 and 113, respectively, in a one-to-one correspondence. The address memories 111 and 113 store the packet offset number of the pre-conversion stream data configuration packet that can be acquired by the counter value of the packet counter 105 and the first data byte of the elementary data extracted from the packet in the elementary data buffers 110 and 112. Storage means having a function of temporarily storing information associated with the address stored in.

  In this embodiment, the elementary data buffer 110 and the address memory 111 are used for video elementary data multiplexed in the video / audio stream data, and the elementary data buffer 112 and the address memory 113 are used for the video / audio stream. It shall be used for audio elementary data that is multiplexed with data.

  In response to the command from the converted stream generation processing command unit 108, the converted packet generation unit 114 stores the elementary data for the specified size output from the elementary data buffers 110 and 112. Then, a converted stream data configuration packet, which is data obtained by combining the packet data generated in the converted packet format with the temporarily stored elementary data for the specified size, is generated and output to the converted stream data buffer 116 It has the function to do.

  The newly inserted packet generation unit 115 receives a command from the converted stream generation processing command unit 108 and generates a packet generated without using the information included in the stream data before conversion, for example, data specific to the multiplexing format of the converted stream data Etc., and a function of outputting the generated packet to the stream data buffer 116 after conversion.

  The post-conversion stream data buffer 116 has a function of temporarily storing the packets output from the conversion packet generation unit 114 and the newly inserted packet generation unit 115, and time-division-multiplexing the packets to the recording medium recording apparatus 102. Further, the converted stream data buffer 116 includes a packet counter 117. The packet counter 117 has a function of counting the total number of converted stream data configuration packets stored from the start of a series of conversion processes. The packet counter 117 increments the counter value by +1 in response to one converted stream data configuration packet being stored in the converted stream data buffer 116.

  The post-conversion stream attribute information data update command unit 118 includes a packet included in the pre-conversion stream attribute information data stored in the pre-conversion stream attribute information data memory 106 based on the packet offset number of the pre-conversion stream data configuration packet. Acquires elementary attribute information data. Further, using this packet elementary attribute information data and the packet offset number of the converted stream data constituent packet obtained from the packet counter 117, packet elementary attribute information data of the converted stream data constituent packet is generated. The packet elementary attribute information data is output to the converted stream attribute information data memory 119.

  In addition, the post-conversion stream attribute information data update command unit 118, together with the packet counter 105, the address memories 111 and 113, and the packet counter 117, the pre-conversion stream data of the pre-conversion stream data configuration packet including the same elementary data. Elementary data tracking means for acquiring the packet offset number from the head of the stream and the packet offset number from the head of the stream data before conversion of the converted stream data constituent packet.

  The converted stream attribute information data memory 119 temporarily stores the converted stream attribute information data composed of one or more converted packet elementary attribute information data generated by the converted stream attribute information data update command unit 118. After storing, it has a function of outputting to the recording medium recording apparatus 102.

  The recording medium recording apparatus 102 inputs the converted stream data temporarily stored in the converted stream data buffer 116 and the converted stream attribute information data temporarily stored in the converted stream attribute information data memory 119. And has a function of recording them on the recording medium 122.

  In the following description, video elementary data will be described for the sake of convenience, but the same applies to audio elementary data.

  Next, the pre-conversion stream data and pre-conversion stream attribute information data recorded on the recording medium 121 and the post-conversion stream data and post-conversion stream attribute information data recorded on the recording medium 122 will be described with reference to FIG.

  The recording medium 121 records pre-conversion stream data schematically shown in FIG. 2A and pre-conversion stream attribute information data shown in FIG.

  As schematically shown in FIG. 2A, the pre-conversion stream data is composed of pre-conversion stream data configuration packets with a packet size of A byte, A_Packet (a), A_Packet (a + 1), A_Packet (a + 2),... Are synthesized in time series. A packet header portion is arranged at the head of each packet. As shown in FIG. 2B, the pre-conversion stream attribute information data is information in which a packet offset number, a display time, and a picture type are associated with each other.

  On the other hand, the converted stream data schematically shown in FIG. 2C and the converted stream attribute information data shown in FIG. As schematically shown in FIG. 2C, the converted stream data includes a converted stream data configuration packet having a packet size of B bytes and a packet in which information specific to the converted stream data is inserted (N ), B_Packet (b), B_Packet (b + 1),..., B_Packet (b + m),. As shown in FIG. 2D, the post-conversion stream attribute information data is information in which a packet offset number, a display time, and a picture type are associated with each other.

  By the copy processing described later according to the present embodiment, the pre-conversion stream data (FIG. 2A) is converted into post-conversion stream data (FIG. 2C), and pre-conversion stream attribute information data (FIG. 2B). Are converted into converted stream attribute information data (FIG. 2D).

  Next, referring to FIG. 3 to FIG. 5, a packet in the stream data before conversion and the packet in the stream data after conversion including the same elementary data are specified, and the converted stream attribute is used using the result. A method for creating information data will be described. 3 to 5, the same components as those in FIG. 1 are denoted by the same reference numerals.

  Here, as in FIG. 2, a packet constituting the stream data before conversion is denoted as A_Packet, and a packet constituting the stream data after conversion is denoted as B_Packet. N is an integer of 1 or more and indicates a packet offset number. Also, the nth A_Packet from the beginning of the stream data before conversion is denoted as A_Packet (n), and the nth B_Packet from the beginning of the stream data after conversion is denoted as B_Packet (n). Furthermore, elementary data stored in A_Packet (n) is denoted as A_Element (n).

  First, the operation of storing the elementary data stored in A_Packet (a) in the elementary data buffer 110 will be described with reference to FIG. It is assumed that A_Packet (a) output from the recording medium playback apparatus 101 is stored in the pre-conversion stream data buffer 104. The pre-conversion stream data buffer 104 outputs the stored A_Packet (a) to the filter 107.

  The counter value of the packet counter 105 is changed (incremented) from a-1 to a every time the first data byte of A_Packet (a) is output from the pre-conversion stream data buffer 104. Then, the filter 107 refers to the elementary data identifier described in the packet header portion indicated by the black square in FIG. 3 of the input A_Packet (a), and whether the A_Packet (a) is video data or audio data. And whether to output to the elementary data buffers 110 and 112 is determined. Here, it is assumed that the video data is determined to be output to the elementary data buffer 110.

  Then, the elementary data A_Element (a) extracted from A_Packet (a) by the filter 107 is stored in the elementary data buffer 110, and the elementary data corresponding to the first data byte of A_Element (a) as shown in FIG. Elementary data address information in which the address p in the buffer 110 is associated with the counter value a of the packet counter 105 is stored in the address memory 111. Note that the counter value a of the packet counter 105 is also stored in the address memory 111 as a pre-conversion packet offset number.

  Next, the operation for generating B_Packet (b) from A_Element (a) stored in the elementary data buffer 110 will be described with reference to FIG.

  As described in conjunction with FIG. 3, when it is detected from the elementary data address information regarding A_Element (a) stored in the address memory 111 that the first data byte of A_Element (a) is to be output from the elementary data buffer 110, A_Element The elementary data 11 including the first data byte of (a) is output to the converted packet generator 114.

  The converted packet generation unit 114 temporarily stores the input elementary data 11 for the specified size, generates a packet header unit 12, and converts the converted packet B_Packet, which is a combination of these, into a post-conversion stream data buffer 116. To be stored. At this time, the counter value of the packet counter 117 is changed (incremented) from b-1 to b. The counter value of the packet counter 117 indicates the packet number counter value (packet offset number) from the first packet generated by the converted packet generation unit 114 and stored in the converted stream data buffer 116 after starting a series of copy processing. . As a result, it is possible to specify that the first data byte of A_Element (a) is stored in B_Packet (b).

  Next, an operation of generating packet elementary attribute information data related to B_Packet (b) will be described with reference to FIG.

  As illustrated in FIG. 5, the post-conversion stream attribute information data update command unit 118 includes a packet elementary attribute related to A_Packet (a) included in the pre-conversion stream attribute information data stored in the pre-conversion stream attribute information data memory 106. Get information data. Then, using this and the packet offset number b of B_Packet (b) obtained from the packet counter 117 by the follow-up process, packet elementary attribute information data of B_Packet (b) is generated. Then, the packet elementary attribute information data is added / reflected to the converted stream attribute information data stored in the converted stream attribute information data memory 119.

  However, before the start of a series of processing, the post-conversion stream attribute information data update command unit 118 is set with the data format of the pre-conversion packet elementary attribute information data and the data format of the post-conversion packet elementary attribute information data. Shall. At this time, if the unit of certain information described in the pre-conversion packet elementary attribute information data and the post-conversion packet elementary attribute information data, for example, the display time unit of the picture is different, it is described in the pre-conversion packet elementary attribute information data. It is necessary to convert from the unit to the unit described in the post-conversion packet elementary attribute information data.

  By repeating the above processing from the beginning A_Packet (1) to the end A_Packet (N) of the stream data file before conversion, the converted stream attribute information data is generated without analyzing the elementary data of the converted stream data. Is possible.

  Next, referring to FIG. 1 together with the flowchart of FIG. 6, the processing from the start of a series of conversion processing until the storage of all elementary data included in the pre-conversion stream data in the elementary data buffer 110 in this embodiment will be described. explain.

  First, the value of the status memory 109 is set to “sending” (step S11).

  Subsequently, the pre-conversion stream attribute information data recorded on the recording medium 121 is reproduced and output by the recording medium reproducing apparatus 101, and the pre-conversion stream attribute information data is stored in the pre-conversion stream attribute information data memory 106 (step S12). ), The count value i of the packet counter 105 is initialized to 0 (step S13).

  Subsequently, the pre-conversion stream data A_Packet (a) to A_Packet (a + x) recorded on the recording medium 121 are reproduced and output by the recording medium reproduction device 101 and are temporarily stored in the pre-conversion stream data buffer 104. (Step S14).

  Next, the first packet A_Packet (a) constituting the pre-conversion stream data is read from the pre-conversion stream data buffer 104 and supplied to the filter 107 (step S15), and the count value i of the packet counter 105 is set to a ( Step S16).

  As described with reference to FIG. 3, the filter 107 extracts the elementary data A_Element extracted from A_Packet (a) to the output destination elementary data buffer 110 determined from the identifier described in the header portion of the input packet A_Packet (a). (A) is supplied and stored (step S17). At almost the same time, an elementary data address in which the address p in the elementary data buffer 110 corresponding to the first data byte of A_Element (a) is associated with the counter value i of the packet counter 105 (a at this time) is associated. Information is stored in the address memory 111 (step S18).

  Subsequently, it is determined whether the pre-conversion stream data stored in the conversion stream data buffer 104 is empty (step S19), and if not empty, the processes of steps S15 to S19 are repeated. When the stream data before conversion becomes empty, it is subsequently determined whether or not the counter value i of the packet counter 105 is the number of packets of stream data before conversion (step S20). Steps S14 to S20 are repeated until the number of packets of the previous stream data is reached.

  Note that the number of packets of the pre-conversion stream data described above is acquired from the total packet number data and file size data, which are information described in the pre-conversion stream attribute information data.

  Thus, when the counter value i of the packet counter 105 reaches the number of packets of pre-conversion stream data, the state memory 109 sets the value to “transmission complete” (step S21), and the pre-conversion stream data transmission processing is terminated (step S21). S22).

  Next, processing for generating converted stream data from all the elementary data stored in the elementary data buffer 110 according to the present embodiment, and simultaneously generating converted stream attribute information data and completing the conversion processing. This will be described with reference to FIG. 1 together with the flowchart of FIG.

  First, it is determined whether the value in the status memory 109 is “sending” (step S31). If it is “sending”, the counter value j of the packet counter 117 is initialized to 0 (step S32). It is determined whether elementary data is stored in the mental data buffer 110 (step S33).

  If the elementary data is not stored in the elementary data buffer 110, the process proceeds to step S40 described later. If it is stored, the elementary data stored in the addresses Ps to Ps + y of the elementary data buffer 110 is stored. A packet including data is generated by the converted packet generation unit 114 (step S34), and the generated packet is stored in the converted stream data buffer 116 (step S35). Thereby, the counter value j of the packet counter 117 is set to j + 1 (step S36).

  Subsequently, the converted stream attribute information data update command unit 118 determines whether or not the elementary data address information relating to the address p (Ps ≦ p ≦ Ps + y) exists in the address memory 111 as described with reference to FIG. Check (step S37), if the elementary data address information does not exist, the process proceeds to step S40, which will be described later, and if present, from the stream attribute information data memory 106 before conversion, the packet elementary attribute before conversion related to A_Packet (i) Information data is acquired (step S38).

  Subsequently, as described with reference to FIG. 5, the post-conversion stream attribute information data update command unit 118 performs post-conversion from the counter value j of the packet counter 117 and the pre-conversion packet elementary attribute information data of A_Packet (i). The converted packet elementary attribute information data relating to the packet B_Packet (j) is generated, and is reflected and stored in the converted stream attribute information data memory 119 (step S39).

  Subsequently, it is determined whether or not the value of the status memory 109 is “transmission complete” (step S40). If it is not “transmission complete”, the processing of steps S33 to S40 is repeated until “transmission complete”. If it is determined that the value of the status memory 109 is “transmission complete”, it is determined whether or not the elementary data buffer 110 is empty, and if there is pre-conversion stream data that has not been converted yet if it is not empty, steps S33 to S33. The process of S41 is repeated. When it is determined that the elementary data buffer 110 is empty, the post-conversion stream data generation process is terminated (step S42).

  Note that the processes according to the flowcharts shown in FIGS. 6 and 7 may be operated in parallel in a series of conversion processes. In addition, the packet offset number including the last elementary data constituting the picture may be described together with the packet offset number constituting the picture in the pre-conversion packet elementary attribute information data. If the last elementary data constituting this picture is to be specified, the elementary data address information regarding the last data byte of the packet including the last elementary data is stored in the address memories 111 and 113. It becomes possible to specify similarly.

  As described above, in this embodiment, conversion is performed when content composed of pre-conversion stream data and pre-conversion stream attribute information data related to the pre-conversion stream data is converted into a different data format in one apparatus. Stream attribute information data related to the converted stream data can be generated without analyzing the post-stream data.

  In the conversion processing example of the first embodiment described above, the post-conversion stream data constituent packet includes the elementary data included in all constituent packets in the pre-conversion stream data. The method was described. In this case, the address memories 111 and 113 acquire from the packet counter 105 the addresses in the elementary data buffers 110 and 112 that temporarily store arbitrary data bytes of the elementary data included in the pre-conversion stream data configuration packet. Elementary data address information associated with the counter value is temporarily stored.

  However, in practice, if only the post-conversion stream data constituent packet storing the elementary data stored in the pre-conversion stream data constituent packet specified by the pre-conversion stream attribute information data can be specified, the pre-conversion stream attribute information There is no problem in generating the stream attribute information data after conversion from the data.

  In other words, the address memories 111 and 113 shown in FIG. 1 merely manage the storage address information and the packet offset number of elementary data related to the pre-conversion stream data constituent packet specified by the pre-conversion stream attribute information data. The same result as in the case of managing all the configuration packets in the pre-conversion stream data described in (1) is obtained. Furthermore, if only the storage address information and packet offset numbers related to all the constituent packets in the stream data before conversion are managed, the storage capacity of the address memories 111 and 113 shown in FIG. This is also a realistic method from the viewpoint of processing speed.

  In this case, the address memories 111 and 113 temporarily store arbitrary data bytes of elementary data included in the stream data configuration packet before conversion specified by the stream attribute information data before conversion among the stream data configuration packets before conversion. Elementary data address information in which the addresses in the elementary data buffers 110 and 112 and the counter value acquired from the packet counter 105 are associated with each other is temporarily stored.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  FIG. 8 shows a system configuration diagram of an example of a system to which the second embodiment of the content data conversion apparatus according to the present invention is applied. In the figure, the content data conversion apparatus 200 according to the second embodiment of the present invention transmits the generated mixed stream data to the external input apparatus 300 via the communication network 400. In order to transmit the stream data and stream attribute information data after conversion to the external input device 300 via the external communication network 400, the content data conversion device 200 according to the present embodiment multiplexes information packets on them. It is characterized by The external input device 300 records the converted stream data and stream attribute information data acquired from the received mixed stream data on a recording medium.

  FIG. 9 shows a block diagram of a second embodiment of the content data conversion apparatus according to the present invention. In the figure, the same components as in FIG. In FIG. 9, the content data conversion apparatus 200 of the present embodiment includes a recording medium playback apparatus 101, a pre-conversion stream data buffer 104, a packet counter 105, a pre-conversion stream attribute information data memory 106, a filter 107, and a conversion stream generation processing instruction. Unit 108, elementary data buffers 110 and 112, address memories 111 and 113, converted packet generating unit 114, newly inserted packet generating unit 115, converted packet elementary attribute information data generating unit 201, mixed stream data buffer 202, packet counter 203 and an external output unit 204.

  The conversion stream generation processing instruction unit 108 has a function of issuing a processing instruction to the elementary data buffers 110 and 112, the conversion packet generation unit 114, the newly inserted packet generation unit 115, and the converted packet elementary attribute information data generation unit 201. . The elementary data buffers 110 and 112, the converted packet generation unit 114, the newly inserted packet generation unit 115, and the converted packet elementary attribute information data generation unit 201 receive the processing instruction issued from the converted stream generation processing instruction unit 108. Perform the required processing.

  The newly inserted packet generation unit 115 receives a processing instruction from the conversion stream generation processing instruction unit 108 and generates a packet generated without using information included in the pre-conversion stream data, for example, a multiplexing format specific to the conversion stream data It has a function of generating a packet storing data and outputting the generated packet to the mixed stream data buffer 202.

  The post-conversion packet elementary attribute information data generation unit 201 generates the pre-conversion stream attribute from the pre-conversion stream attribute information data memory 106 based on the packet offset number of the pre-conversion stream data constituent packet that is the counter value of the packet counter 105. The packet elementary attribute information data relating to the pre-conversion stream data constituting packet is acquired from the information data. Then, the packet elementary attribute information data related to the post-conversion stream data constituent packet is generated from the packet elementary attribute information data related to the pre-conversion stream data constituent packet and the packet offset number of the post-conversion stream data constituent packet.

  In addition, the post-conversion packet elementary attribute information data generation unit 201 converts the pre-conversion stream data configuration packet including the same elementary data together with the packet counter 105, the address memories 111 and 113, and the packet counter 203 described later. Elementary data follow-up means for obtaining the packet offset number from the head of the previous stream data and the packet offset number from the head of the pre-conversion stream data of the converted stream data constituting packet is configured.

  The converted packet generation unit 114 combines the elementary data of the specified size supplied from the elementary data buffers 110 and 112 and the packet header of the converted packet format to generate a converted stream data configuration packet. Further, the converted packet generation unit 114 is a post-conversion data that is data obtained by converting the converted packet elementary attribute information data input from the converted packet elementary attribute information data generation unit 201 into a form that matches the converted packet format. A packet elementary attribute information data packet is generated.

  The mixed stream data buffer 202 has a function of temporarily storing each packet output from the converted packet generation unit 114 and the newly inserted packet generation unit 115, time division multiplexing, and outputting to the external output unit 204. The mixed stream data buffer 202 includes a packet counter 203.

  The packet counter 203 has a function of counting the total number of mixed stream data configuration packets stored since the start of a series of conversion processes. That is, the packet counter 203 increments the counter value by 1 each time the mixed stream data configuration packet is stored in the mixed stream data buffer 202. This counter value is the packet offset number of the mixed stream data configuration packet. The external output unit 204 has a function of outputting the mixed stream data stored in the mixed stream data buffer 202 to the communication network 400 outside the content data conversion apparatus 200.

  As described above, in the present embodiment, conversion including the same elementary data is performed from the packet offset number of the stream data constituting packet before conversion and the counter value of the packet counter 203 stored in the address memories 111 and 113. The relationship between the packet offset numbers of the previous stream data configuration packet and the mixed stream data configuration packet is derived, and based on the relationship, the converted packet elementary attribute information data generation unit 201 converts the converted packet attribute information data from the converted stream attribute information data. Elementary attribute information data is generated.

  Next, the configuration of the external input device 300 will be described.

  FIG. 10 shows a block diagram of an example of the external input device 300. The external input device 300 includes an external input unit 301 that receives mixed stream data from an external communication network 400, a filter 302 having an identification function, a converted stream data buffer 303, a converted stream attribute information data update command unit 304, a counter 305, a converted stream attribute information data memory 306, and a recording medium recording device 307.

  The filter 302 identifies whether each packet constituting the input mixed stream data is a converted stream data configuration packet, a converted packet elementary attribute information data packet, or another packet, When it is identified as a stream data component packet after conversion, it is output to the stream data buffer 303 after conversion. When it is identified as packet elementary attribute information data after conversion, the packet elementary attribute information data after conversion is extracted and extracted. The converted packet elementary attribute information data is output to the converted stream attribute information data update command unit 304.

  The converted stream attribute information data update command unit 304 updates the converted stream attribute information data stored in the converted stream attribute information data memory 306 based on the converted packet elementary attribute information data. The post-conversion stream attribute information data update command unit 304 includes a counter 305 that counts the number of times the post-conversion packet elementary attribute information data is acquired from the filter 302.

  The converted stream attribute information data memory 306 has a function of temporarily storing the converted stream attribute information data output from the converted stream attribute information data update command unit 304.

  The recording medium recording device 307 receives the converted stream data from the converted stream data buffer 303 and the converted stream attribute information data from the converted stream attribute information data memory 306 as inputs, and records these therein. It has a function of recording on the medium 308.

  Next, various data structures in the present embodiment will be described with reference to FIG.

  The recording medium 121 shown in FIG. 9 records pre-conversion stream data schematically shown in FIG. 11A and pre-conversion stream attribute information data shown in FIG.

  As schematically shown in FIG. 11A, the pre-conversion stream data is composed of pre-conversion stream constituent packets having a packet size of A byte, A_Packet (a), A_Packet (a + 1 ), A_Packet (a + 2),... In time series. A packet header portion is arranged at the head of each packet. As shown in FIG. 11B, the pre-conversion stream attribute information data is information in which a packet offset number, a display time, and a picture type are associated with each other. The stream data before conversion schematically shown in FIG. 11A is the same as the stream data before conversion shown in FIG. 2A, and the stream attribute information data before conversion shown in FIG. This is the same as the pre-conversion stream attribute information data shown in FIG.

  FIG. 11C schematically shows the mixed stream data output from the external output unit 204 of the content data conversion apparatus illustrated in FIG. 9 and input to the external input unit 301 of the external input apparatus 300 illustrated in FIG. Show. As shown in FIG. 11C, the mixed stream data includes a converted stream data configuration packet (An, Bn, Cn) whose packet size is B bytes, a converted packet elementary attribute information data packet (En ) And the packet (N) etc. in which the information specific to the stream data after conversion is inserted are synthesized in time series in the order of C_Packet (c), C_Packet (c + 1),. ing.

  11D and 11E show converted stream data and converted stream attribute information data recorded on the recording medium 308 of the external input device 300 shown in FIG. As shown schematically in FIG. 11D, the converted stream data to be recorded includes a converted stream data configuration packet (An, Bn, Cn) having a packet size of B bytes and a converted stream. The packet (N) in which data-specific information is inserted is a time series in the order of B_Packet (b), B_Packet (b + 1), ..., B_Packet (b + m), ... Have been synthesized. Each packet B_Packet (n) has a packet header portion at the head, but the packet (N) into which the unique information of the converted stream data is inserted in the other portion, or the converted stream data configuration One of the packets (An, Bn, Cn) or the like is stored. As shown in FIG. 11E, the post-conversion stream attribute information data is information in which a packet offset number, a display time, and a picture type are associated with each other.

  Next, referring to FIG. 12 and FIG. 13, in the content data conversion apparatus of FIG. 9, the pre-conversion stream data configuration packet and the post-conversion stream data configuration packet including the same elementary data are identified, and the result is A method of creating post-conversion stream attribute information data will be described below. 12 and 13, the same components as those in FIG. 9 are denoted by the same reference numerals.

  Here, as in FIG. 11, each packet configuring the stream data before conversion is expressed as A_Packet, each packet configuring the mixed stream data is expressed as C_Packet, and each packet configuring the stream data after conversion is expressed as B_Packet. Also, n is an integer equal to or greater than 1, and the nth packet A_Packet from the beginning of the stream data before conversion is represented as A_Packet (n). Similarly, the nth packet C_Packet from the beginning of the mixed stream data is denoted as C_Packet (n), and the nth packet B_Packet from the beginning of the converted stream data is denoted as B_Packet (n).

  Further, elementary data included in A_Packet is expressed as A_Element, and converted packet elementary attribute information data included in C_Packet is expressed as C_Attr. A_Element (n) is the elementary data included in A_Packet (n), and C_Attr (n) is the converted packet elementary attribute information data related to B_Packet (m) (not necessarily m = n) included in C_Packet (n) It is.

  9 outputs the A_Packet (a) reproduced from the recording medium 121 to the filter 107 through the stream data buffer 104 before conversion. The filter 107 determines whether the output destination is the elementary data buffer 110 or the elementary data buffer 112 according to the elementary data identifier described in the packet header portion of A_Packet (a). Further, as described with reference to FIG. 3, the filter 107 stores the A_Element (a) extracted from the A_Packet (a) in the elementary data buffer 110 or the elementary data buffer 112 almost simultaneously with the first data byte of A_Element (a). Is stored in the address memory 111. Elementary data address information p associated with the counter value a of the packet counter 105 is stored in the address memory 111.

  FIG. 12 shows that the pre-conversion packet offset number a, which is the counter value of the packet counter 105, and the address p in the elementary data buffer 110 are stored in the address memory 111 in association with each other.

  Next, an operation of generating a mixed stream data packet C_Packet (c) from elementary data A_Element (a) stored in the elementary data buffer 110 will be described with reference to FIG.

  As shown in FIG. 12, when it is detected from the elementary data address information regarding A_Element (a) stored in the address memory 111 that the first data byte of A_Element (a) is to be output from the elementary data buffer 110, A_Element ( The data 13 including the first data byte of a) is output to the converted packet generator 114.

  The converted packet generation unit 114 temporarily stores the input elementary data 13 of the specified size and generates a packet header unit 14, and converts the converted packet C_Packet (c), which is a combination of these, into the mixed stream data buffer The data is supplied to 202 and stored. At this time, the counter value of the packet counter 203 is changed (incremented) from c-1 to c. The counter value of the packet counter 203 indicates the packet number counter value from the first packet of the mixed stream data generated by the converted packet generation unit 114 and stored in the mixed stream data buffer 202 after starting a series of copy processing. As a result, it is possible to specify that the first data byte of A_Element (a) is stored in C_Packet (c).

  Next, as shown in FIG. 13, the converted packet elementary attribute information data C_Attr (c) relating to B_Packet (m) included in C_Packet (c) is generated, and the converted packet elementary attribute information data C_Packet ( The operation for generating c + i) will be described.

  As illustrated in FIG. 13, the post-conversion packet elementary attribute information data generation unit 201 acquires pre-conversion packet elementary attribute information data regarding A_Packet (a) from the pre-conversion stream attribute information data memory 106. Then, using the acquired pre-conversion elementary attribute information data and the counter value c of the packet counter 203, post-conversion packet elementary attribute information data C_Attr (c) is generated. The post-conversion packet elementary attribute information data C_Attr (c) is information in which the mixed packet offset number, which is the counter value c, the display time, and the picture type are associated with each other as shown in FIG.

  Then, after the generated packet C_Packet of the mixed stream data including the generated converted packet elementary attribute information data C_Attr (c) is generated by the converted packet generation unit 114 as shown in FIG. 13, it is stored in the mixed stream data buffer 202. To do. However, the packet identifier described in the packet header portion 15 of C_Packet including C_Attr (c) is determined in advance before the start of a series of conversion processing, and this packet identifier is generated by the newly inserted packet generation portion 115. It is necessary to describe in the packet identifier table of the mixed stream data included in C_Packet. The packet C_Packet of the mixed stream data including the post-conversion packet elementary attribute information data C_Attr (c) becomes the c + 1th and subsequent packets from the head of the mixed stream data, that is, C_Packet (c + i) (i ≧ 1). .

  As described above, in the embodiment shown in FIG. 9, when stream data and stream attribute information data related to the stream data are converted into different data formats, the stream attribute information data related to the converted stream data is analyzed without analyzing the converted stream data. Can be generated.

  Next, recording processing in the external input device 300 in FIG. 10 will be described with reference to FIGS. 14 and 15. 14 and 15, the same components as those in FIG. 10 are denoted by the same reference numerals. The mixed stream data transmitted from the content data conversion apparatus 200 shown in FIG. 9 is received by the external input unit 301 in the external input apparatus 300 shown in FIG. 10 via the communication network 103, and then output to the filter 302. The

  The filter 302 outputs the input packet C_Packet to the converted stream data buffer 303 based on the identification information described in the packet header part of the packet C_Packet of the input mixed stream data, or is included in the C_Packet It is determined whether to extract C_Attr to be output to the stream attribute information data update command unit 304 after conversion.

  If the filter 302 determines that the input packet C_Packet is a packet to be output to the converted stream data buffer 303 based on the identification information of the packet header part, as shown in FIG. 14, the converted stream data buffer The input packet C_Packet is output to 303.

  On the other hand, when the filter 302 determines that the packet C_Packet of the input mixed stream data is a C_Packet including the converted packet elementary attribute information data C_Attr based on the identification information of the packet header part, as shown in FIG. Then, the input packet C_Packet is output to the post-conversion stream attribute information data update command unit 304.

  The post-conversion stream attribute information data update command unit 304 acquires post-conversion packet elementary attribute information data C_Attr from the input packet C_Packet, and post-conversion stream attribute information based on the acquired post-conversion packet elementary attribute information data C_Attr The converted stream attribute information data stored in the data memory 306 is updated.

  However, when the converted stream data is generated by removing the packet C_Packet including the converted packet elementary attribute information data C_Attr from the mixed stream data, inconsistency occurs between the converted stream data and the converted stream attribute information data. That is, C_Attr (c) is the converted packet elementary attribute information data related to C_Packet (c), but the converted stream data packet B_Packet (c) is not equal to the mixed stream data packet C_Packet (c). It is a problem that occurs.

  This problem is that the post-conversion stream attribute information data update command unit 304 changes the packet offset number c described in C_Attr (c) to a value b obtained by subtracting the counter value h of the counter 305 from c, as shown in FIG. It can be avoided by replacing.

  Also, packet offset number information that can identify the c + i-th packet C_Packet from the beginning of the mixed stream data is described in C_Packet (c + i) including the converted packet elementary attribute information data C_Attr (c). The converted stream data and the converted stream attribute information data are calculated by calculating a difference from the packet offset number information and the number of packets of the actually input mixed stream data and reflecting the difference when generating the converted stream attribute information data. And inconsistencies can be prevented.

  As a result, the mixed stream data transmitted from the content data conversion apparatus 200 can be input to the external input apparatus 300 and recorded from the middle. For example, it is possible to start the transmission output of the content data conversion device 200 while the input of the external input device 300 is in a paused state, and to start the input of the external input device 300 at a certain timing.

  The recording medium recording device 307 in FIG. 10 receives the converted stream data output from the converted stream data buffer 303 and the converted stream attribute information data output from the converted stream attribute information data memory 306 as inputs. These are recorded on the recording medium 308. Through the above processing, converted stream data and converted stream attribute information data can be generated from the externally input mixed stream data.

  Note that the present invention is not limited to the above-described embodiment. For example, instead of the recording medium playback apparatus 101 in FIG. 1, the conversion related to the pre-conversion stream data and the pre-conversion stream data transmitted or supplied from the outside. It may be a means for receiving content data composed of previous stream attribute information data.

It is a block diagram of 1st Embodiment of the content data converter of this invention. It is a figure which shows an example of the data structure of the various data in embodiment of FIG. In the embodiment of FIG. 1, it is a figure which shows an example of the process which extracts elementary data from the stream data before conversion, and memorize | stores it in an elementary data buffer. In the embodiment of FIG. 1, it is a figure which shows an example of the process which acquires the elementary data from the elementary data buffer, and produces | generates the packet which comprises the stream data after conversion. In the embodiment of FIG. 1, it is a figure which shows an example of the process which updates the post-conversion stream attribute information data. It is a flowchart explaining an example of the stream data transmission process before conversion in embodiment of FIG. It is a flowchart explaining an example of the stream data generation process after conversion in embodiment of FIG. It is a system configuration | structure figure of an example of the system with which 2nd Embodiment of the content data converter of this invention is applied. It is a block diagram of 2nd Embodiment of the content data converter of this invention. It is a block diagram of an example of the external input device in the system of FIG. It is a figure which shows an example of the data structure of the various data in the system of FIG. It is explanatory drawing of an example of the process which produces | generates the packet of mixed stream data from the elementary data memorize | stored in the elementary data buffer in FIG. FIG. 10 is an explanatory diagram of an example of processing for generating post-conversion packet elementary attribute information data regarding a packet included in mixed stream data in the embodiment of FIG. 9. In the external input device of FIG. 10, it is operation | movement explanatory drawing when it determines with the input packet being a packet output to the stream data buffer after conversion based on the identification information of a packet identifier table. In the external input device of FIG. 10, it is operation | movement explanatory drawing when it determines with the packet input based on the identification information of a packet identifier table being a packet output to the stream attribute information data memory after conversion. It is a figure which shows an example of map information.

Explanation of symbols

100, 200 Content data conversion device 101 Recording medium playback device 102, 307 Recording medium recording device 104 Pre-conversion stream data buffer 105, 117, 203 Packet counter 106 Pre-conversion stream attribute information data memory 107, 302 Filter 108 Conversion stream generation processing instruction Unit 110, 112 elementary data buffer 111, 113 address memory 114 conversion packet generation unit 115 newly inserted packet generation unit 116, 303 post-conversion stream data buffer 118, 304 post-conversion stream attribute information data update instruction unit 119, 306 post-conversion stream Attribute information data memory 201 Converted packet elementary attribute information data generation unit 202 Mixed stream data buffer 204 External output unit 300 External Input device 301 External input unit 305 Counter

Claims (6)

1st stream data comprised by the packet of a 1st packet format, and 1st stream attribute information data which are the data containing at least the information used when reproducing | regenerating said 1st stream data The content data is data including at least information used when reproducing the second stream data and the second stream data composed of packets of a second packet format different from the first packet format. A content data conversion device for converting to content data composed of second stream attribute information data,
Input means (101) for inputting the first stream data and the first stream attribute information data;
First buffering means (104) for temporarily storing the first stream data input by the input means;
First storage means (106) for temporarily storing the first stream attribute information data input by the input means;
Extracting elementary data, which is at least one of video data and audio data, included in each packet constituting the first stream data output from the first buffering means, and temporarily Second buffering means (110, 112) for sequentially storing the elementary data by a predetermined size that can be inserted into the packet of the second packet format,
Each packet constituting the second stream data is sequentially generated by combining the header portion of the second packet format with the elementary data of the predetermined size sequentially output from the second buffering means. Packet generating means (114) to perform,
A first packet offset number which is a packet offset number from the first packet of the first stream data, and a second packet offset number which is a packet offset number from the first packet of the second stream data. Elementary data follow-up means (105, 111, 113, 117, 118) to be acquired;
Based on the first packet offset number, a first packet elementary which is attribute information data for each packet included in the first stream attribute information data stored in the first storage means. The attribute information data is acquired, and further, the first packet elementary attribute information corresponding to each packet of the second stream data is used by using the first packet elementary attribute information data and the second packet offset number. Packet elementary attribute information data generating means (118) for generating information data;
Third buffering means (116) for temporarily storing each packet constituting the second stream data generated by the packet generating means;
Second storage means for temporarily storing the second stream attribute information data composed of one or more second packet elementary attribute information data generated by the packet elementary attribute information data generation means (119),
A content data conversion apparatus comprising: The elementary data following means is
First counter means (105) for counting the total number of each packet constituting the first stream data output from the first buffering means;
An address in the second buffering means for temporarily storing arbitrary data bits of the elementary data included in each packet constituting the first stream data, and a counter obtained from the first counter means Third storage means (111, 113) for temporarily storing the first elementary data address information associated with the value;
Second counter means (117) for counting the total number of each packet constituting the second stream data input to the third buffering means;
A specifying means (118) for specifying the first packet offset number and the second packet offset number from the counter value indicated by the elementary data address information and the counter value acquired from the second counter means. The content data conversion recording apparatus according to claim 1, further comprising: The elementary data following means is
First counter means (105) for counting the total number of each packet constituting the first stream data output from the first buffering means;
Of the packets constituting the first stream data, the arbitrary data bits of the elementary data included in the packets constituting the first stream data specified by the first stream attribute information data are temporarily stored. Third memory for temporarily storing second elementary data address information in which the address stored in the second buffering means stored in association with the counter value obtained from the first counter means is temporarily stored Means (111,113);
Second counter means (117) for counting the total number of each packet constituting the second stream data input to the third buffering means;
A specifying means (118) for specifying the first packet offset number and the second packet offset number from the counter value indicated by the elementary data address information and the counter value acquired from the second counter means. The content data conversion apparatus according to claim 1, further comprising:   Each packet constituting the second stream data output from the third buffering means and the second stream attribute information data output from the second storage means are recorded on a recording medium, respectively. 2. The content data converting apparatus according to claim 1, further comprising recording means (102). 1st stream data comprised by the packet of a 1st packet format, and 1st stream attribute information data which are the data containing at least the information used when reproducing | regenerating said 1st stream data The content data is data including at least information used when reproducing the second stream data and the second stream data composed of packets of a second packet format different from the first packet format. A content data conversion device for converting to content data composed of second stream attribute information data,
Input means (101) for inputting the first stream data and the first stream attribute information data;
First buffering means (104) for temporarily storing the first stream data input by the input means;
First storage means (106) for temporarily storing the first stream attribute information data input by the input means;
Extracting elementary data, which is at least one of video data and audio data, included in each packet constituting the first stream data output from the first buffering means, and temporarily Second buffering means (110, 112) for sequentially storing the elementary data by a predetermined size that can be inserted into the packet of the second packet format,
Each packet constituting the second stream data is sequentially generated by combining the header portion of the second packet format with the elementary data of the predetermined size sequentially output from the second buffering means. In addition, the second packet elementary attribute information data, which is attribute information data for each packet, included in the second stream attribute information data, and each packet constituting the second data stream are mixed. Mixed stream data generating means (114) for generating mixed stream data;
Obtain a first packet offset number that is a packet offset number from the first packet of the first stream data and a second packet offset number that is a packet offset number from the first packet of the mixed stream data Elementary data follow-up means (105, 111, 113, 203, 201),
Based on the first packet offset number, a first packet elementary which is attribute information data for each packet included in the first stream attribute information data stored in the first storage means. The second packet elementary attribute information corresponding to each packet of the mixed stream data is acquired using the first packet elementary attribute information data and the second packet offset number. Packet elementary attribute information data generating means (201) for generating data and outputting to the mixed stream data generating means;
Third buffering means (116) for temporarily storing each packet constituting the mixed stream data generated by the mixed stream data generating means;
External output means (204) for outputting the mixed stream data stored in the third buffering means to the outside;
A content data conversion apparatus comprising: The mixed stream data generating means includes
Each packet constituting the second stream data, a packet including the second packet elementary attribute information data, each packet constituting the second stream data, and the second packet elementary attribute information data Packet offset number information from the first packet is described in the packet header portion of the packet including the identification information for identifying the packet including the second packet elementary attribute information data. 6. The content data conversion apparatus according to claim 5, wherein said content data conversion apparatus is means for generating the mixed stream data.

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