JP2007019690A - Section dispersing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress section filtering performance of portable AV reproducing equipment for AV viewing using a memory card. <P>SOLUTION: Disclosed is a section dispersing method in which a section dispersing device receives a transport stream, limits a multi-section packet where a number of sections exceeding a threshold are multiplexed to a multi-section packet based upon the threshold, generates a multi-section packet of remaining sections, and substitutes the generated packet for a NULL packet in the transparent stream. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver, and more particularly to a method for processing a packet sent in a section format.

  Describes the processing of packets sent in section format, taking as an example a device that receives a digital broadcast compliant with the MPEG system standard, records the received packet on a memory card, and reads and plays the packet from the memory card. To do.

  First, an MPEG transport stream (hereinafter referred to as MPEG-TS) used in the MPEG system will be described. MPEG-TS is a continuous stream of 188-byte fixed-length packets (hereinafter TS packets).

  As shown in FIG. 11, the TS packet includes a TS header 101, an adaptation field 102, and a payload 103. Here, the payload 103 is composed of variable length packet data 104 in PES format for sending Video, Audio, and subtitle broadcasts, and section format data 105 for sending PSI, EPG, SI, CA, BML, private data, and the like. Includes an identifier for identifying the type of packet (hereinafter referred to as PID), and the digital broadcast receiver determines the type of packet from the PID. The adaptation field 102 has information for synchronizing a 27 MHz clock on the transmission side and the reception side of a digital broadcasting system called PCR (not shown), and highly accurate synchronous reproduction is performed on the receiver side.

  Next, the section format will be described. FIG. 12 shows a section structure, which includes a table ID 201, a section syntax display 202, a section length 203, data 204, data 206, a table ID extension 205, a CRC 32207, and the like. Here, the table ID 201 is an identifier for identifying a section type, and the receiver extracts a target section from the table ID 201.

  The section syntax display 202 indicates that the general section syntax is followed when the 1-bit indicator is set to “1”, the section length 203 is followed by the table ID extension 205, and the section syntax display 202 is displayed. When set to “0”, it indicates that the data 204 follows the section length 203.

  The section length 203 indicates the number of remaining bytes from the section length 203 to the end of the following section. Data 204 and 206 can transmit data itself such as PSI, EPG, SI, CA, BML, and private data. The table ID extension 205 is a 16-bit field whose use and value are defined by the user. CRC 32-207 is an error correction bit field for section transmission. A plurality of sections can be superimposed in the payload of a 1TS packet, and such a packet is particularly called a multi-section packet.

  Next, an apparatus for receiving the transport stream as described above and recording the received packet once on a memory card and an apparatus for reading and reproducing the packet from the memory card will be described with reference to FIGS.

  First, a case where a broadcast wave is recorded on a memory card will be described. In FIG. 13, a broadcast wave is received by the antenna 300 and sent to the digital tuner 301. The digital tuner 301 performs digital demodulation, takes out the transport stream, and sends it to the memory card recording device 302. The memory card recording device 302 extracts only the packets necessary for recording from the PID of the TS header and records them on the memory card 303.

  Next, a detailed configuration of the portable AV playback device 304 is shown in FIG. 14, and a case where a program recorded on the memory card is played back will be described with reference to FIG.

  The portable AV playback device 304 includes a memory card reading circuit 401 that reads data from the memory card 303, a PID filter 402 that extracts a predetermined packet from the PID of the TS packet, and a data extraction circuit 403 that extracts a payload from the TS packet. , A section filter circuit 404 for extracting a predetermined section from the table ID of the section, a memory 405, a memory access circuit 405 for writing data into the memory 405, an AV decoder 407 for performing MPEG decompression, and a CPU 408 for controlling the entire reproducing apparatus. It has.

  A case will be described in which a program recorded on the memory card of the portable AV playback device 304 configured as described above is played back. The memory card reading circuit 401 reads the transport stream from the memory card 303 and sends it to the PID filter 402. The PID filter 403 extracts a predetermined packet and sends it to the data extraction circuit 403.

  If the TS packet sent to the data cutout circuit 403 is in PES format, the PES payload portion is cut out and sent to the memory access circuit 406. The PES payload portion sent to the memory access circuit 406 is sent to the memory 405. Video data and audio data are MPEG-expanded by an AV decoder 407. The subtitle data is processed by the CPU 408.

  If the TS packet sent to the data cut-out circuit 403 is in section format, the section portion is cut out and sent to the section filter circuit 404. A predetermined section is extracted from the table ID of the section arriving at the section filter circuit 404 and sent to the memory access circuit 406. The section sent to the memory access circuit 406 is sent to the memory 405. The section stored in the memory 405 is subjected to processing such as channel selection and EPG screen creation by the CPU 408.

  Details of the stream between the blocks in FIG. 13 will be described. A is a transport stream sent from the digital tuner 301 to the memory card recorder 302, B is a transport stream sent from the memory card recorder 302 to the memory card 303, and C is a portable AV playback device from the memory card 303. Is a transport stream sent to. An example of each stream indicated by A, B, and C is shown in FIG. 501 in FIG. 15 is a multi-section packet including five sections. This is the same as the packets 502 and 503.

  On the other hand, the section filter performance of the portable AV playback device 304 needs to satisfy the processing even when the stream input to the portable AV playback device 304 has a maximum input rate and a maximum multi-section packet. For example, when the section filter circuit 404 is operated at 33 MHz, the maximum input rate is 20 Mb / s, and the maximum number of multi-sections is 46, the section filter circuit 404 is within 2481 clocks per packet. It is necessary to satisfy the performance of completing the pattern matching of 8B.

  In the case of the system configured in FIG. 13, the stream arriving at the portable AV playback device 304 has the same broadcast wave maximum input rate and the maximum number of multisections, and section filtering performance sufficient to satisfy this stream processing is required. become. However, the portable AV playback device 304 needs to be driven with low power consumption, and the clock of the built-in circuit cannot be increased.

Therefore, as an example of the prior art, since sections are transmitted by the carousel data transmission method, there is one that detects the redundancy of section retransmission and reduces redundant sections (see, for example, Patent Document 1). When a stream recorded by such a method is played back by the portable AV playback device 304, the number of activations of the section filter circuit 404 is reduced, and the total power is reduced in the playback processing of the digital broadcast.
JP 2000-252966 A

  However, in the prior art method, the maximum multi-section number read by the portable AV playback device does not change, and the maximum multi-section packet may continue, so that the stream arriving at the portable AV playback device is a broadcast wave. The maximum input rate and the maximum number of multisections are the same, and section filtering performance sufficient to satisfy this stream processing is required.

  An object of the present invention is to suppress the section filtering performance of a portable AV playback device for viewing AV from a memory card as described above, and to enable stream processing with a light load.

  In order to solve the above-described problem, the section distribution method of the present invention receives a transport stream, limits a multi-section packet in which the number of sections equal to or greater than a threshold is multiplexed, to a threshold multi-section packet, and a remaining section. A multi-section packet having a threshold value is created, and the created packet is replaced with a NULL packet in the transport stream.

  Alternatively, a partial-format transport stream is received, a multi-section packet in which the number of sections equal to or greater than the threshold is multiplexed is limited to a threshold multi-section packet, and the remaining sections are created as threshold multi-section packets. The packet is inserted in a place where there is no packet in the transport stream.

  According to the present invention, the maximum number of multi-sections in a transport stream can be converted, and stream processing with a light load can be performed by an AV playback device or the like.

(Embodiment 1)
An example of an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an example of a system according to an embodiment of the present invention. The configuration shown in this figure shows a device that receives a digital broadcast compliant with the MPEG system standard, records the received packet on a memory card, and a device that reads and reproduces the packet from the memory card.

  In FIG. 1, an antenna 300 that receives broadcast waves, a digital tuner 301 that performs digital demodulation, a section distribution device a600 according to the present invention, a memory card recording device 302 that records data on a memory card, a memory card 303 that records data, A portable AV playback device 304 that reads and plays back data from the memory card 303 is provided. Note that the operations of the antenna 300, the digital tuner 301, the memory card recording device 302, the memory card 303, and the portable AV playback device 304 in FIG. The section distribution device a600 will be described later.

  Next, an example of processing of a transport stream flowing between blocks in FIG. 1 will be described with reference to FIG.

  In FIG. 1, A is a transport stream input to the section distribution device a600, and E is a transport stream output from the section distribution device a600.

  In this example, it is assumed that a packet sequence as indicated by A in FIG. 2 is input to the section distribution device a600 as the transport stream A. In the example of FIG. 2, the multi-section 700 in the transport stream A is a multi-section packet in which five sections are multiplexed, and the details are shown in 704 in the figure. Furthermore, it is assumed that the section distribution device a600 is set with two section thresholds.

  Here, when the section distribution device a600 receives a multi-section packet with a threshold value or more, the section distribution device a600 creates and transmits a multi-section packet with a threshold value. For the remaining sections, the multi-section packet that does not exceed the threshold value is generated. It is created and replaced with a NULL packet in the transport stream A.

  As shown in FIG. 2, a multi-section packet 700 of 5 sections is received, and a multi-section 701 of 2 sections is created and transmitted by the section distribution device a600. For the remaining three sections, a two-section multi-section 702 and a one-section multi-section 703 are created. The multi-section 702 is inserted into a NULL packet 708, and the multi-section 703 is inserted into a NULL packet 709. .

  In FIG. 2, 705 is a detailed view of the multi-section 701, 706 is a detailed view of the multi-section 702, and 707 is a detailed view of the multi-section 703.

  Next, FIG. 3 shows a detailed configuration diagram of the section distribution apparatus a600 that performs the above operation, and the section distribution operation will be described in detail.

  In FIG. 3, the section distribution device a600 includes an input packet temporary storage unit 801 that temporarily stores an input packet, a section number counter unit 802 that counts the number of sections in the packet stored in the input packet temporary storage unit 801, and , A section number threshold storage unit 804 that stores the maximum number of multi-sections of the output transport stream, a section number counted by the section number counter unit 802, and an input packet from the section number threshold set in the section number storage unit 804. When section distribution is performed by the section distribution determination unit 803 that determines whether or not to distribute sections, and when the section distribution determination unit 803 performs section distribution, the input packet 801 is reconstructed to be equal to or less than the number of sections stored in the section number threshold storage unit 804. And insert the packet A packet reconstruction unit a805 stored in the storage unit 806, an insertion packet storage unit 806 that stores the reconstructed packet output from the packet reconstruction unit a805, and a NULL packet is inserted into the input packet temporary storage unit 801. A NULL packet insertion unit 807, an output packet temporary storage unit 808 for temporarily storing packets sent from the input packet temporary storage unit 801, and a NULL packet determination unit 809 for determining whether the contents of the output packet temporary storage unit 808 are NULL packets. The packet insertion unit 810 inserts the packet in the inserted packet storage unit 806 into the output packet temporary storage unit 808 when the NULL packet determination unit 809 determines that the packet is a NULL packet.

  Further, FIG. 4 shows a detailed configuration of the packet reconstruction unit a805 in FIG.

  In FIG. 4, the packet restructuring unit a805 determines the section and section breaks in the packet of the section threshold value storage unit 901 that sets the number of multisections of the packet to be reconstructed and the input packet temporary storage unit 801. A section pointer determination unit 902 that determines a threshold value break section pointer stored in the section threshold storage unit 901 and stores the section pointer determination unit 902 in the section threshold pointer storage unit 903, and reads and temporarily stores a packet from the input packet temporary storage unit 801. The reconstructed packet temporary storage unit 904, the PUSI rewriting unit 907 that rewrites the PUSI (packet unit start indicator) of the packet in the reconstructed packet temporary storage unit 904, and the section threshold pointer storage unit 903 are used to take a pointer ahead of the section pointer. The stuffing byte of the adaptation field is created from the values of the section forward pointer storage unit 905, the section rear pointer storage unit 906 that takes the pointer behind the section pointer, and the section front pointer storage unit 905, and is stored in the reconstructed packet temporary storage unit 904. The stuffing byte is calculated from the value of the AF stuffing insertion unit 908 to be inserted, the value of the section forward pointer storage unit 905, the PF insertion unit 909 for inserting the pointer field into the reconstructed packet temporary storage unit 904, and the value of the section backward pointer storage unit 906. The stuffing insertion unit 910 is created and inserted into the reconstructed packet temporary storage unit 904.

  Details of the section restructuring operation will be described with reference to FIG. 5 in the case where the section threshold is set to 2 for the packet input 1001.

  First, in FIG. 5, the input packet 1001 has five sections multiplexed. Section 5 (1012) is the last section of the multi-section, Section 1 (1013) is the first section, and Section 2 (1014) is In the second section, Section 3 (1015) is the third section, and Section 4-0 (1016) is a fragmented version of the fourth section. The remaining data of the section is multiplexed.

  Further, 1010 is a TS header, PUSI (payload unit start indicator) is 1, and PF (pointer field) 1011 stores the number of bytes up to Section 1 (1013).

  When the input packet 1001 as described above is stored in the input packet temporary storage unit 801 and 2 is stored in the section number threshold storage unit 901, the section pointer determination unit 902 includes the input packet in FIG. Pointer 01 (1017), Pointer 02 (1018), Pointer 03 (1019), Pointer 04 (1020) pointers are extracted and stored in the section threshold pointer storage unit 903.

  When reconstructing the first packet, the packet is sent from the input packet temporary storage unit 801 to the reconstructed packet temporary storage unit 904. Next, Pointer 01 (1017) is read into the section forward pointer storage unit 905, and Pointer 02 (1018) is read into the section backward pointer storage unit 906.

  Here, when the first packet is reconstructed, the PUSI rewriting unit 907, the AF stuffing insertion unit 908, and the PF insertion unit 909 do not operate.

  Further, the stuffing insertion unit 910 inserts a stuffing byte (0xff) behind Pointer 02 (1018) in the section backward pointer storage unit 906 to reconstruct the packet.

  The reconstructed packet of the first packet is indicated by 1002 in FIG.

  When reconstructing the second packet, the packet is sent from the input packet temporary storage unit 801 to the reconstructed packet temporary storage unit 904. Next, Pointer 02 (1018) is read into the section forward pointer storage unit 905, and Pointer 03 (1019) is read into the section backward pointer storage unit 906.

  When reconstructing the second and subsequent packets, the PUSI rewriting unit 907 sets the PSUI (payload unit start indicator) in the TS header to 1.

  Next, the AF stuffing insertion unit 908 inserts stuffing bytes in the adaptation field up to one byte before Pointer 02 (1018) of the section forward pointer storage unit 905. Next, the PF insertion unit 909 inserts a pointer field (value 0x00) one byte before Pointer 02 (1018) in the section forward pointer storage unit 905. Next, the stuffing insertion unit 910 inserts a stuffing byte (0xff) behind Pointer 03 (1019) in the section backward pointer storage unit 906 to reconstruct the packet.

Thereafter, when the packet is reconstructed, the packet is reconstructed by the procedure for creating the second packet. The reconstructed packet of the second packet is indicated by 1003 and the reconstructed packet of the third packet is indicated by 1004. Next, an example of the packet reconstructing process in the case of a packet having no straddling section where data is multiplexed across different packets Will be explained. FIG. 6 is a diagram illustrating a configuration of a packet restructuring unit having a straddling section determination unit.

  The packet restructuring unit b1100 includes a straddling section determination unit 1101 that determines whether the packet in the input packet temporary storage unit 801 is a straddling section, a section threshold storage unit 1102 that sets the number of multisections of the packet to be reconstructed, and an input packet In the packet of the temporary storage unit 801, a section and a section break are determined, a threshold section break pointer stored in the section threshold storage unit 1102 is determined, and the section threshold pointer storage unit 1104 is stored. A section pointer determination unit 1103, a reconstructed packet temporary storage unit 1105 that reads and temporarily stores a packet from the input packet temporary storage unit 801, and a PUSI (packet unit start indicator) of the packet in the reconstructed packet temporary storage unit 1105 are written. A PUSI rewriting unit 1108 to be replaced, a section forward pointer storage unit 1106 that takes a pointer ahead of the section pointer from the section threshold pointer storage unit 1104, a section backward pointer storage unit 1107 that takes a pointer behind the section pointer, and a section forward pointer storage unit A PF insertion unit 1109 that inserts a pointer field into the reconstructed packet temporary storage unit 1105 from the value of 1106, and a stuffing byte from the value of the section backward pointer storage unit 1107, and the stuffing that is inserted into the reconstructed packet temporary storage unit 1105 It is comprised from the insertion part 1111.

  In order to explain the operation of section reconstruction of a packet having no straddling section, the operation when the section threshold is set to 2 for the packet input 1201 will be described using FIG.

  First, in FIG. 7, the input packet 1201 has three sections multiplexed, Section 1 (1212) is the first section, Section 2 (1213) is the second section, and Section 3 (1214) is the third section. The section is followed by stuffing bytes.

  The TS header is 1210, the PUSI (payload unit start indicator) is 1, and the PF (pointer field) 1211 stores the number of bytes (0x00) up to Section 1 (1212).

  The input packet 1201 as described above is stored in the input packet temporary storage unit 801, and the straddling section determination unit 1101 determines that the packet in the input packet temporary storage unit 801 does not straddle a section. Next, when 2 is stored in the section number threshold storage unit 1102, the section pointer determination unit 1103 extracts the pointers of Pointer 01 (1216), Pointer 02 (1217), and Pointer 03 (1218) to extract the section threshold pointer storage unit. Stored in 1104.

  When reconstructing the first packet, the packet is sent from the input packet temporary storage unit 801 to the reconstructed packet temporary storage unit 1105. Next, the pointer 01 (1216) is read into the section forward pointer storage unit 1106, and the pointer 02 (1217) is read into the section backward pointer storage unit 1107.

  When reconstructing the first packet, the PUSI rewriting unit 1108, the PF insertion unit 1109, and the section shifter unit 1110 do not operate.

  The stuffing insertion unit 1111 inserts a stuffing byte (0xff) behind the pointer 02 (1217) of the section backward pointer storage unit 1107 to reconstruct the packet.

  The reconstructed packet of the first packet processed as described above is shown at 1202 in FIG.

  When reconstructing the second packet, the packet is sent from the input packet temporary storage unit 801 to the reconstructed packet temporary storage unit 904. Next, Pointer 02 (1217) is read into the section forward pointer storage unit 905, and Pointer 03 (1218) is read into the section backward pointer storage unit 1107.

  When reconstructing the second and subsequent packets, the PUSI rewriting unit 1108 sets the PSUI (payload unit start indicator) in the TS header to 1.

  Next, the PF insertion unit 1109 inserts a pointer field (value 0x00) immediately after the TS header. Next, the section data from Pointer 02 (1217) of the section forward pointer storage unit 1106 to Pointer 03 (1218) of the section backward pointer storage unit 1107 is shifted to immediately after the PF. Next, the stuffing insertion unit 1111 performs stuffing using Pointer02 (1217) of the section forward pointer storage unit 1106 using Pointer03 (1218) of the section backward pointer storage unit 1107 (TS header: 4 bytes + PF: 1 byte Pointer03 (1218)) -Stuffing after Pointer 02 (1217).

  Thereafter, when reconstructing the packet, the packet is reconstructed in the procedure of creating the second packet.

  Note that the processing operation when the input packet stored in the input packet temporary storage unit 801 determines that the crossing section determination unit 1101 has a section crossing is the same as in FIG.

  As described above, the stream subjected to the section distribution processing is written in the memory card 303 via the memory card recording device 302 in FIG. The transport stream F at that time is as indicated by F in FIG. As shown in the figure, Section 1 is distributed in packets that maximize the two set threshold values. Of course, the same applies to the transport stream G that the portable AV playback device 304 reads from the memory card 303 for processing. As described above, by using the section distribution device of the present invention, the maximum number of multi-sections processed by the portable AV playback device 304 can be limited.

  For example, in the case of a section distribution apparatus that restricts multi-section packets with two thresholds as in this embodiment, the section filter circuit 404 is operated at 33 MHz, the maximum input rate is 20 Mb / s, and the maximum number of multi-sections is two. Considering the case of processing, the section filter circuit 404 only needs to satisfy the performance of completing the 8B pattern matching of the two-section filter within 2481 clocks per packet. Can be demonstrated.

  Further, when the section filter circuit 404 has the performance of completing the 8B pattern matching of the 46 section filter within 2481 clocks per packet at the operation of 33 MHz, the operation frequency of the section filter circuit 404 is 33 to 23 MHz. Can be satisfied.

  The threshold value 2 set in the present embodiment is an example for explaining the operation of the present invention, and is not limited to this value.

(Embodiment 2)
As an example of another embodiment of the present invention, an apparatus for reading a digital broadcast compliant with the MPEG system standard recorded on an HDD or the like using FIG. 8 and recording the read packet on a memory card, and its memory An apparatus for reading and reproducing packets from a card will be described.

  In FIG. 8, the HDD (hard disk drive) 1301 storing the digital broadcast compliant with the MPEG system standard, the HDD reading circuit 1302 for reading data from the HDD 1301, the section distribution device b1300 according to the present invention, and the memory card are recorded. A memory card recording device 302, a memory card 303 for recording data, and a portable AV playback device 304 for reading and reproducing data from the memory card 303 are provided.

  The operations of the memory card recording device 302, the memory card 303, and the portable AV playback device 304 in FIG.

  The data recorded in the HDD 1301 stores a transport stream obtained by receiving a broadcast wave and extracting only necessary data, and deletes and stores a NULL packet of the broadcast wave transport stream. Such a stream is called a partial transport stream.

  An example of the transport stream flowing between the blocks in FIG. 8 is shown in FIG. 9, and will be described with reference to both drawings.

  In FIG. 8, H is a transport stream input to the section distribution apparatus b1300, and I is the output transport stream. Here, similarly to the above-described embodiment, a case where the section threshold value of the section distribution device 1300 is set to two is taken as an example.

  In FIG. 9, the multi-section 1400 in the transport stream H is a multi-section packet in which five sections are multiplexed.

  In this case, when the section distribution device b1300 receives a multi-section packet having a threshold value or more, the section distribution device b 1300 creates and transmits a multi-section packet with a threshold value. For the remaining sections, a multi-section packet that does not exceed the threshold is created and inserted into the partial packet portion in the transport stream H.

  As shown in FIG. 9, a multi-section packet 1400 of 5 sections is received, and a multi-section 1401 of 2 sections is created and transmitted by the section packet distribution device b1300. For the remaining three sections, a two-section multi-section 1402 and a one-section multi-section 1403 are created, and the multi-section 1402 is inserted into the portion of the packet 1400 and the packet 1408 having a data interval of one packet, The multisection 1403 is inserted into the packet 1403 between the packet 1408 and the packet 1409.

  In FIG. 9, 1405 is a detailed view of the multi-section 1401, 1406 is a detailed view of the multi-section 1402, and 1407 is a detailed view of the multi-section 1403.

  Next, FIG. 10 shows a detailed configuration diagram of the section distribution apparatus b1300. The section distribution apparatus b 1300 in FIG. 10 is configured such that a reassembled packet can be inserted into the partial packet portion by adding a partial packet determination unit 1500 to the section distribution apparatus a described with reference to FIG. . Since other operations are the same as those of the section distribution device a, a description thereof will be omitted.

  On the other hand, with respect to the section filter performance of the portable AV playback device 304, the same effect as described in the first embodiment can be obtained.

  The section distribution apparatus of the present invention can convert the maximum number of multi-sections in a transport stream, and is useful in portable AV playback devices and the like that require stream processing that is light in processing.

1 is a block diagram showing an example of a system according to Embodiment 1 of the present invention. The figure which shows an example of the transport stream which concerns on Embodiment 1 of this invention. 1 is a block diagram showing a configuration of a section distribution device according to Embodiment 1 of the present invention. The block diagram which shows the structure of the packet reconstruction part a which concerns on Embodiment 1 of this invention. The figure which shows an example of the packet reconstructed which concerns on Embodiment 1 of this invention The block diagram which shows the structure of the packet reconstruction part b which concerns on Embodiment 1 of this invention. The figure which shows another example of the packet reconstructed which concerns on Embodiment 1 of this invention. Block diagram showing an example of a system according to Embodiment 2 of the present invention The figure which shows an example of the transport stream which concerns on Embodiment 2 of this invention. Block diagram showing the configuration of a section distribution apparatus according to Embodiment 2 of the present invention The figure which shows an example of a transport stream packet Diagram showing the structure of section syntax Block diagram showing an example of a system according to the prior art Block diagram showing the configuration of a portable AV playback device according to the prior art The figure which shows an example of the transport stream which concerns on a prior art

Explanation of symbols

300 Antenna 301 Digital Tuner 302 Memory Card Recording Device 303 Memory Card 304 Portable AV Playback Device 600 Section Distribution Device a
801 Input packet temporary storage unit 802 Section number counter unit 803 Section distribution determination unit 804 Section number threshold storage unit 805 Packet reconstruction unit a
806 Inserted packet storage unit 807 NULL packet insertion unit 808 Output packet temporary storage unit 809 NULL packet determination unit 810 Packet insertion unit 901 Section threshold storage unit 902 Section pointer determination unit 903 Section threshold pointer storage unit 904 Reconstructed packet temporary storage unit 905 Section Forward pointer storage unit 906 Section backward pointer storage unit 907 PUSI rewriting unit 908 AF stuffing insertion unit 909 PF insertion unit 910 Stuffing insertion unit 1100 Packet reconstruction unit b
1101 Cross Section Determination Unit 1102 Section Threshold Storage Unit 1103 Section Pointer Determination Unit 1104 Section Threshold Pointer Storage Unit 1105 Reconstructed Packet Temporary Storage Unit 1106 Section Forward Pointer Storage Unit 1107 Section Back Pointer Storage Unit 1108 PUSI Rewrite Unit 1109 PF Insertion Unit 1111 Stuffing Insertion section 1300 section dispersion device b
1301 HDD
1302 HDD read circuit 1500 Partial packet determination unit

Claims (2)

Receives the transport stream, limits the multi-section packet with the number of sections equal to or greater than the threshold multiplexed to the threshold multi-section packet, creates the multi-section packet with the remaining sections as the threshold, and transfers the created packet to the above-mentioned transport. A section distribution method that replaces NULL packets in a port stream. Packets created by receiving a transport stream in partial format, limiting multi-section packets in which the number of sections greater than or equal to the threshold is multiplexed to threshold multi-section packets, and creating multi-section packets with threshold for the remaining sections A section distribution method in which a packet is inserted where there is no packet in the transport stream.

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