JP2008085863A - Transport stream correction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus capable of satisfying a limitation for a second standard when recorded video data stored in a first device compliant to a first standard are edited to generate edited video data and the edited video data are to be outputted to a second device compliant to the second standard different from the first standard. <P>SOLUTION: A transport stream correction apparatus (10) of the present invention comprises an input unit (1), an adjustment unit (2), and output units (4, 5). First streams (recorded video data; recorded MPEG2 TS-A, TS-B) composed of a plurality of packets stored in the first device are inputted to the input unit (1). The adjustment unit (2) changes an array of the plurality of packets contained in the first streams (edited video data; edited MPEG2 TS) so as to satisfy the limitation for the second standard. The output units (4, 5) re-multiplex the plurality of packets of which the array is changed by the adjustment unit (2) and output them to the second device (30) as a second stream. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to moving picture experts group (MPEG) format video data, and more particularly to a transport stream correction apparatus for inputting transport stream format video data.

  In a system that records, edits, and distributes video data, MPEG (Moving Picture Experts Group) data is exemplified as a format of video data. In this case, MPEG data is used as content data, and video, audio, and information related thereto are multiplexed and recorded or transmitted in one stream. Examples of MPEG data include an MPEG1 system, an MPEG2 system, and an MPEG4 system.

  For example, in a system in which broadcast video data is stored in a personal computer (PC) or digital device, in the case of analog television (TV) broadcasting, the received video signal is converted into the MPEG2PS (Program Stream) format used in DVD disks and the like. Thus, recording and editing methods are widely used. On the other hand, in the case of digital TV broadcasting, broadcast video is distributed in the MPEG2TS (Transport Stream) format, which is a format for distribution, and in the future, digital TV broadcasting will be generalized instead of analog TV broadcasting. Recording and editing in the MPEG2TS format will be common. Examples of editing include cutting (deleting) video, audio, and information corresponding to a commercial (CM) included in one stream, or combining two or more streams into one stream. . Therefore, the MPEG2TS format of the MPEG2PS format and the MPEG2TS format will be described with an example of problems that occur in recording and editing.

  First, in the MPEG2TS format standard (ISO-IEC 13818-1), in order to ensure that the MPEG2TS input (or distributed) to the recording / reproducing device is correctly reproduced, the operation in the recording / reproducing device is performed. An assumed (virtual) “virtual decoding unit” model constraint is defined. This “virtual decoding unit” is called T-STD (Transport Stream System Target Decoder).

  As shown in FIG. 1, MPEG2TS has a plurality of TS packets. Each of the plurality of TS packets includes a TS packet portion having a fixed size of 188 [bytes]. The TS packet part includes a header of 4 [bytes] and a payload set with a code of 184 [bytes]. In the header, a PID (Packet ID) for identifying the code set in the payload is set. The PID represents one of a video (Video) code representing video, an audio (Audio) code representing voice, a system (System) code for controlling these packets, and other packets. Thus, the plurality of TS packets are configured by a video packet including the above video code, an audio packet including the above audio code, a system packet including the above system code, or other packets.

  In the MPEG2TS format of the standard (ISO-IEC 13818-1), video packets, audio packets, and system packets included in the MPEG2TS are arranged so as to satisfy the constraints of the T-STD 100 as shown in FIG. Yes. For example, when the recording / reproducing device complies with the standard (ISO-IEC 13818-1), it is necessary to assume whether the restrictions of the T-STD 100 are obeyed when creating an MPEG2TS to be supplied to the recording / reproducing device. . The T-STD 100 includes a separator 101, P video packet buffers connected in series from the first to the Pth, Q audio packet buffers connected in series from the first to the Qth, The system includes a buffer for R system packets connected in series from the first to the Rth, a decoder (video decoder) 141 for video packets, a decoder (audio decoder) 142 for audio packets, and a system control 143. is doing. Here, P, Q, and R are assumed to be 3, 2, and 2, respectively. In this case, the buffers for the three video packets represent the transport buffer 111, the multiplex buffer 112, and the elementary buffer 113, respectively. The two audio packet buffers represent a transport buffer 121 and an elementary buffer 122, respectively. The two system packet buffers represent a transport buffer 131 and a system buffer 132, respectively.

  The separating unit 101 receives MPEG2TS.

  The separating unit 101 includes TS packets representing video packets among a plurality of TS packets included in the MPEG2 TS in this order from the first to the last, in this order, the transport buffer 111, the multiplexing buffer 112, the elementary buffer 113, and the video decoder 141. Output for. At this time, the video decoder 141 virtually decodes the video code included in the video packet in this order from the first to the last. Here, in the standard MPEG2TS format, as a restriction of T-STD in the video packet, when the video packet included in the MPEG2TS is supplied to each of the three video packet buffers 111 to 113, The condition is that the buffers 111 to 113 are arranged so as not to overflow, or the buffers 112 to 113 are arranged not to underflow.

  Separating section 101 outputs TS packets representing audio packets among a plurality of TS packets from the first to the last in this order to transport buffer 121, elementary buffer 122, and audio decoder 142. At this time, the audio decoder 142 virtually decodes the audio code included in the audio packet in this order from the first to the last. Here, in the standard MPEG2TS format, as a restriction of T-STD in the audio packet, when the audio packet included in the MPEG2TS is supplied to each of the two audio packet buffers 121 to 122, the audio packet included in the MPEG2TS The condition is that the buffers 121 to 122 are arranged so as not to overflow, or the buffers 122 are arranged not to underflow.

  Separating section 101 outputs TS packets representing system packets among a plurality of TS packets to transport buffer 131, system buffer 132, and system control 143 in this order from the first to the last. Here, in the standard MPEG2TS format, as a T-STD restriction in the system packet, when the system packet included in the MPEG2TS is supplied to each of the two system packet buffers 131 to 132, The condition is that the buffers 131 to 132 are arranged so as not to overflow.

  Here, in the MPEG2TS format, recorded video data (recorded MPEG2TS) stored in a first apparatus conforming to a certain MPEG2TS standard (hereinafter referred to as the first standard) is converted into an MPEG2TS standard (hereinafter referred to as the first standard) different from the first standard. When copying (or moving) to a second device conforming to (2 standards), it is assumed that the T-STD constraint is satisfied for the second device that is the output destination.

  As an example, MPEG2TS of terrestrial digital TV broadcasting is stored as recorded MPEG2TS in a first device (editing device) conforming to the terrestrial digital broadcasting standard (referred to as the first standard), and the recorded MPEG2TS is edited by the editing device. The case of copying (or moving) the edited MPEG2TS to a recording / playback apparatus (second apparatus) for a disk (Blu-ray disk) conforming to the Blu-ray standard (second standard) will be described. The recorded MPEG2TS of the terrestrial digital TV broadcast means that the MPEG2TS in an arbitrary channel (one program) is stored as a partial transport stream with a time stamp from the broadcast wave of the terrestrial digital TV broadcast. In this case, each TS packet of the partial transport stream with a time stamp includes a time stamp (4 [bytes]) indicating the arrival time of the packet and the TS packet part (fixed to 188 [bytes]). .

In the terrestrial digital broadcasting standard (first standard), for a partial transport stream with a time stamp (hereinafter, TS with time stamp or MPEG2 TS), the transmission rule of the system packet is ARIB TR-B14 11.1.2 “TS packet. "Transmission details". However, the terrestrial digital broadcast transmission standard to be followed by the receiver does not describe the compliance of the system packet regarding T-STD. The system packet restrictions are only defined as follows.
-Six identical TS packets with the same PID are not transmitted continuously.
-Do not transmit more than 320 [kbit] per second with the same PID.
-Send TS packets with the same PID in a range of 4 kB ± 100% in 32 [ms] units.
(This is the cause of the overflow of the transport buffer 131 among the system packet buffers 131 to 132 on the Blu-ray standard (second standard). This will be described later.)

  On the other hand, in the Blu-ray standard (second standard), it is an indispensable condition to satisfy the T-STD constraint on the output destination. That is, the MPEG2TS input to a recording / reproducing apparatus (disc recording / reproducing apparatus) for a disc (Blu-ray disc) conforming to the Blu-ray standard needs to satisfy the above-described essential conditions regarding the T-STD 100. .

First, it is assumed that a recorded MPEG2TS that complies with the digital broadcasting standard is edited by an editing apparatus (first apparatus) to generate an edited MPEG2TS. Since the edited MPEG2TS from the editing device (first device) is supplied to the disk recording / reproducing device, the T-STD separation unit 101 assuming the disk recording / reproducing device (second device) includes Then, the edited MPEG2TS is input.
The separation unit 101 includes TS packets representing video packets among a plurality of TS packets included in the edited MPEG2 TS in this order from the first to the last, in this order, the transport buffer 111, the multiplex buffer 112, the elementary buffer 113, the video Output to the decoder 141. At this time, the video decoder 141 decodes the video code included in the video packet in this order from the first to the last.
Separating section 101 outputs TS packets representing audio packets among a plurality of TS packets from the first to the last in this order to transport buffer 121, elementary buffer 122, and audio decoder 142. At this time, the audio decoder 142 decodes the audio code included in the audio packet in this order from the first to the last.
Separating section 101 outputs TS packets representing system packets among a plurality of TS packets to transport buffer 131, system buffer 132, and system control 143 in this order from the first to the last.
The disc recording / reproducing device (second device) outputs the output edited MPEG2TS to a Blu-ray disc.

  In addition, as a restriction of T-STD in the MPEG2TS format system packet for the Blu-ray standard, the capacity (size) of the transport buffer 131 and the system buffer 132 is defined as 512 [bytes] and 1536 [bytes], respectively. Yes. For example, as shown in FIG. 3, in the Blu-ray standard, if the size of the system packet supplied to the transport buffer 131 exceeds 512 [bytes], an overflow occurs, which is a violation of the standard. This means that two 188 [byte] TS packets (system packets) can be held, but three cannot be held.

Such an overflow occurs when the recorded MPEG2TS is edited and the edited MPEG2TS is generated by the editing apparatus (first apparatus). For example, as shown in FIG. 4, the video packet, the audio packet, and the system packet included in the MPEG2TS satisfy buffers T-STD, respectively, so that buffers 111 to 113, buffers 121 to 122, and buffers 131 to 132 are included. As shown in FIG. 5, the editing device (first device) divides the recorded MPEG2TS into the first to third divided recorded MPEG2TSs, and the second division is performed. In order to delete the recorded MPEG2TS, an edited MPEG2TS is generated by combining the first divided recorded MPEG2TS and the third divided recorded MPEG2TS (cut editing), and an array of a plurality of TS packets included in the edited MPEG2TS Will change. For this reason, the arrangement of system packets among the plurality of TS packets is also changed. When this edited MPEG2TS is applied to the Blu-ray standard, the size of the system packet supplied to the transport buffer 131 may exceed 512 [bytes] and overflow.
Further, even when the editing apparatus (first apparatus) does not perform cut editing and simply combines the first recorded MPEG2TS and the second recorded MPEG2TS as a recorded MPEG2TS to generate an edited MPEG2TS (combined editing). There is a possibility that an overflow will occur at the joint part as described above.
Further, even when the editing apparatus (first apparatus) generates a single unedited MPEG2TS, depending on the arrangement of MPEG2TS packets of the original terrestrial digital broadcasting standard (first standard), the Blu- There is a possibility of overflow in the ray standard.

  In this way, when copying (or moving) an edited MPEG2TS (or unedited MPEG2TS) obtained by editing recorded MPEG2TS of terrestrial digital broadcasting to a Blu-ray standard disc, the original TS packet is simply copied ( Or, there is a problem that the T-STD constraint may not be satisfied only by moving.

  Therefore, the recorded video data (recorded MPEG2TS) stored in the first device conforming to the first standard (digital broadcasting standard) is edited (cut editing / combined editing) and edited video data (edited MPEG2TS). Is generated, when copying to a second device that conforms to a second standard (Blu-ray standard) different from the first standard, the T-STD constraint is satisfied for the second device that is the output destination It is desirable to perform correction processing.

  Introduces technologies related to transport streams.

  Japanese Patent Laying-Open No. 2003-224831 (Patent Document 1) describes a multiplexing device. This multiplexing device remultiplexes the bitstream. The multiplexing apparatus calculates a data amount that can be inserted into the first multiplexed stream based on an arrival time of the first multiplexed stream; and an amount corresponding to the data amount calculated by the calculating unit And multiplexing means for multiplexing the second multiplexed stream by inserting data into the first multiplexed stream. Thereby, the content of the predetermined stream multiplexed can be easily changed.

  Japanese Patent Laid-Open No. 2001-016267 (Patent Document 2) describes a communication device. The communication device is connected to the receiving device via a network that transmits data according to a network clock. The communication apparatus includes: a generating unit that generates a clock that is synchronized with the network clock; a counting unit that counts the clock generated by the generating unit; and a count that is counted by the counting unit on input data. An adding means for adding a value, and a transmitting means for transmitting the data to which the count value has been added by the adding means to the receiving device are provided. As a result, the MPEG transport packet is output to the decoder so that the VBV buffer does not fail.

  Japanese Patent Laying-Open No. 2004-336488 (Patent Document 3) describes an information processing apparatus. The information processing apparatus includes a data string having a source packet having a transport packet and its arrival time stamp as a unit, and the second multiplexing is performed on the first picture that is the last picture of the first multiplexed stream. The multiplexed stream connected so that the second picture which is the first picture of the stream is continuously reproduced is decoded. The information processing apparatus includes: output means for outputting the source packet in accordance with the arrival time stamp of the multiplexed stream; a video buffer for buffering video data in the source packet; and audio data in the source packet. An audio buffer for ringing, video decoding means for decoding video data buffered in the video buffer, and audio decoding means for decoding audio data buffered in the audio buffer, the audio buffer comprising: It has a capacity capable of buffering audio data for a time required to input the second picture to the video buffer. As a result, an audio buffer having an optimum capacity is obtained when two multiplexed streams obtained by multiplexing an audio stream and a video stream are seamlessly decoded.

JP 2003-224831 A JP 2001-016267 A JP 2004-336488 A

  The subject of the present invention is that when the recorded video data stored in the first device conforming to the first standard is edited (cut editing / combined editing) and the edited video data is generated, the first standard is An object of the present invention is to provide a transport stream correction apparatus capable of satisfying restrictions on the second standard when copying (or moving) to a second apparatus conforming to a different second standard.

  Hereinafter, means for solving the problem will be described using the numbers and symbols used in [Best Mode for Carrying Out the Invention]. These numbers and symbols are added to clarify the correspondence between the description of [Claims] and the description of [Best Mode for Carrying Out the Invention]. It should not be used to interpret the technical scope of the invention described in “

The transport stream correction device (10) of the present invention includes an input unit (1), an adjustment unit (2), and output units (4, 5).
The input unit (1) includes a first stream (recorded video data; recorded MPEG2TS-A, B) composed of a plurality of packets stored in a first device conforming to a first standard (digital broadcasting standard). Is entered.
The adjusting unit (2) is configured to satisfy the restriction on a second standard (Blu-ray standard) different from the first standard (digital broadcast standard), so that the first stream (edited video data; edited MPEG2TS) is satisfied. ) To change the arrangement of the plurality of packets.
The output unit (4, 5) re-multiplexes the plurality of packets whose arrangement has been changed by the adjustment unit (2), and a second device conforming to the second standard (Blu-ray standard) as a second stream (30; Blu-ray disc) to output (copy or move).

The transport stream correction device (10) of the present invention further includes a virtual decoding unit (100; T-STD) that assumes a decoding operation in the second device (30; Blu-ray disc).
The virtual decoding unit (100; T-STD) includes a separation unit (101) that separates the plurality of packets included in the first stream (edited MPEG2TS) into video packets, audio packets, and system packets; A packet buffer (111 to 113), an audio packet buffer (121 to 122), and a system packet buffer (131 to 132) are provided.
The adjustment unit (2) monitors the video packet buffer (111 to 113), the audio packet buffer (121 to 122), and the system packet buffer (131 to 132), and the video packet buffer. (111 to 113), the audio packet buffer (121 to 122), and the system packet buffer (131 to 132) satisfy the restriction in the second standard (Blu-ray standard). The arrangement of the plurality of packets included in the stream (edited MPEG2TS) is changed.

In the transport stream correction device (10) according to the present invention, each of the plurality of packets includes arrival time information indicating an arrival time of the packet.
The adjustment unit (2) changes the arrangement of the plurality of packets by changing the arrival time information.

In the transport stream correction apparatus (10) of the present invention, the system packet is composed of a PAT (Program Association Table), a PMT (Program Map Table), and a CAT (Conditional Access Table).
The adjustment unit (2) monitors the system packet buffers (131 to 132) and changes the arrangement of the system packets so as to satisfy the specifications in the PAT, PMT, and CAT.

  The transport stream correction method of the present invention uses the computer that is the transport stream correction device (10). The computer includes a computer program that is the input unit (1), the adjustment unit (2), and the output units (4, 5). In this case, the transport stream correction method of the present invention is realized by the above computer program.

  As described above, the transport stream correction device (10) of the present invention can edit the recorded video data (recorded MPEG2TS-A, B) stored in the first device conforming to the first standard (digital broadcasting standard). When the edited video data (edited MPEG2TS) is generated by (cut editing / combining editing), the second device (30; recording / recording for Blu-ray disc) conforming to the second standard (Blu-ray standard) When copying (or moving) to a playback device, it is possible to satisfy the restrictions on the second standard. In this case, the data itself of the edited video data (edited MPEG2TS) is not changed, and the amount of increase / decrease in the data length can be suppressed as much as possible to correct the data inconsistency due to the difference in standards.

  Hereinafter, a transport stream correction apparatus according to the present invention will be described in detail with reference to the accompanying drawings. Here, description overlapping with the above-mentioned [Background Art] will be omitted.

  FIG. 6 shows the configuration of the transport stream correction apparatus 10 of the present invention.

The transport stream correction apparatus 10 is a computer, and includes an input unit 1, a temporary storage unit 2, an adjustment unit 3, a multiplexing unit 4, an output unit 5, and the above-described virtual decoding unit T-STD 100. It has. The temporary storage unit 2, the adjustment unit 3, the multiplexing unit 4, and the T-STD 100 are realized by hardware (example: circuit) and software (example: computer program).
The input unit 1 is connected to the T-STD 100. The T-STD 100 is connected to the adjustment unit 3. The adjustment unit 3 is connected to the temporary storage unit 2 and the multiplexing unit 4. The multiplexing unit 4 is connected to the output unit 5.

  Copy recorded video data (recorded MPEG2TS) stored in a first device conforming to the first standard (digital broadcasting standard) to a second device conforming to a second standard different from the first standard (or When moving, it is necessary to satisfy the T-STD constraint for the second device that is the output destination. Here, as an example, MPEG2TS of terrestrial digital TV broadcasting is stored as recorded MPEG2TS in a first device conforming to the standard, and the recorded MPEG2TS is edited (cut editing / combined editing) by editing device 20 and edited MPEG2TS. As an example, a case where data is copied (or moved) to the recording / reproducing device 30 (second device) for a disc (Blu-ray disc) conforming to the second standard (Blu-ray standard) will be described.

  FIG. 7 is a flowchart showing the operation of the transport stream correction apparatus 10 of the present invention.

  In the Blu-ray standard, it is an indispensable condition to satisfy the T-STD constraint on the output destination. In this case, it is assumed that the output unit 5 of the transport stream correction apparatus 10 can be loaded with a recording / reproducing apparatus 30 for Blu-ray discs conforming to the Blu-ray standard.

It is assumed that the edited MPEG2TS-A and the recorded MPEG2TS-B are combined by the editing apparatus 20 to generate an edited MPEG2TS. At this time, the edited MPEG2TS is generated so that the TS packet representing the video packet and the audio packet among the plurality of TS packets included in the edited MPEG2TS does not include noise when decoded. To do. In addition, TS packets representing video packets and audio packets satisfy the T-STD restrictions.
Such an edited MPEG2TS is supplied from the editing device 20 to the input unit 1, and the separation unit 101 inputs the edited MPEG2TS (input processing; step S1).

  Next, a virtual decoding process is executed (step S2).

The separation unit 101 includes TS packets representing video packets among a plurality of TS packets included in the edited MPEG2 TS in this order from the first to the last, in this order, the transport buffer 111, the multiplex buffer 112, the elementary buffer 113, the video Output to the decoder 141. At this time, the video decoder 141 virtually decodes the video code included in the video packet in this order from the first to the last.
Separating section 101 outputs TS packets representing audio packets among a plurality of TS packets from the first to the last in this order to transport buffer 121, elementary buffer 122, and audio decoder 142. At this time, the audio decoder 142 virtually decodes the audio code included in the audio packet in this order from the first to the last.
Separating section 101 outputs TS packets representing system packets among a plurality of TS packets to transport buffer 131, system buffer 132, and system control 143 in this order from the first to the last.

  The adjustment unit 2 monitors the T-STD 100 and executes adjustment processing (step S3).

The adjustment process will be described.
As shown in FIG. 8, a plurality of edited MPEG2TS TS packets conforming to the first standard (digital broadcasting standard) are the first to mth (m is an integer of 3 or more) of the recorded MPEG2TS-A. It includes m TS packets and n TS packets from the first to the nth (n is an integer of 3 or more) of the recorded MPEG2TS-B. Each of the m TS packets includes a 4-byte time stamp representing arrival times tA (1) to tA (m) [ms], and each of the n TS packets has an arrival time tB (1) to tB ( n) Includes a time stamp representing [ms]. The actual time stamp (arrival time) is recorded in a unit defined in each standard, for example, 27 MHz in the digital broadcasting standard or the Blu-ray standard, and here, the recorded unit is a different unit [ms]. Shall be read as
In general, it is assumed that the recorded MPEG2TS-A and the recorded MPEG2TS-B have time stamps that are continuous in time by the editing apparatus 20. At this time, the recorded MPEG2TS-B is set with a time stamp so as to be continuously captured after the recorded MPEG2TS-A, and each arrival time is set to tB ′ (1) to tB ′ (n) [ms. ] (At this time, tA (m) <tB ′ (x)).

As described above, the separation unit 101 converts the TS packets representing the system packets from the first to the last of the TS packets of the edited MPEG2TS in this order from the transport buffer 131, the system buffer 132, and the system control 143. Output for.
At this time, in the constraint adjustment process, the adjustment unit 2 selects a correction target system packet that does not satisfy the T-STD constraint for the Blu-ray standard from the first to last system packets, and temporarily stores the packet. Save to 3. The adjustment unit 2 reads the correction target system packet from the temporary storage unit 3 when the adjustment time elapses as a time for satisfying the above-described restrictions on the correction target system packet, and arrives in the correction target system packet. Add the above adjustment time to the time.

  For example, as shown in FIG. 8, arrival times tA (m), tB ′ (1), tB ′ (2), tB ′ among a plurality of TS packets conforming to the first standard (digital broadcasting standard). Assume that TS packets including (3), tB ′ (4), and tB′5) represent a system packet, a video packet, a system packet, a system packet, a video packet, and an audio packet, respectively. Further, according to the second standard (Blu-ray standard), the capacity (size) of the transport buffer 131 is defined as 512 [bytes]. Therefore, the transport buffer 131 can hold the system packet (188 [byte] × 2) at the arrival times tA (m) and tB ′ (2), but the arrival times tA (m), tB ′ (2), The system packet (188 [bytes] × 3) including tB ′ (3) cannot be held, and the third system packet overflows.

Therefore, in the adjustment process, the adjustment unit 2 selects, as a correction target system packet, a system packet including the arrival time tB ′ (3) that causes an overflow from the first to last system packets and temporarily stores it. Save to part 3.
The adjustment unit 2 reads the correction target system packet from the temporary storage unit 3 when the adjustment time α [ms] has elapsed as a time for avoiding the T-STD overflow for the correction target system packet. Here, it is assumed that the adjustment time α is a time corresponding to one TS packet, and the arrival time tB ′ (3) is decremented by the adjustment time α. In this case, the adjustment unit 2 adds the adjustment time α to the arrival time tB ′ (3) included in the correction target system packet.
When the system packet including the arrival time {tB ′ (3) + α} is larger than the arrival time tB ′ (4), the system packet including the arrival time tB ′ (4) and the arrival time tB ′ ( 5) are arranged between the audio packets including the above.

  The multiplexing unit 4 re-multiplexes the edited MPEG2TS that conforms to the first standard (digital broadcasting standard) output from the T-STD 100, and outputs the corrected MPEG2TS that conforms to the second standard (Blu-ray standard) as the output unit 5 Output to. The output unit 5 outputs the corrected MPEG2TS to the recording / reproducing apparatus 30 for Blu-ray disc (output process; step S4).

  The adjustment process will be specifically described.

FIG. 9 shows the relationship between the type of system packet and the insertion period for the Blu-ray standard.
The system packets from the first to the last are composed of a PAT (Program Association Table), a PMT (Program Map Table), and a CAT (Conditional Access Table). The system packet PAT indicates a PID included in TS packets representing all the system packets PMT among a plurality of TS packets, and the insertion period is defined as 100 [ms] or less. The system packet PMT indicates a PID included in a TS packet representing a component (video packet, audio packet, etc.) constituting one channel among a plurality of TS packets, and an insertion period thereof is within 100 [ms]. It is prescribed. The system packet CAT indicates a PID for transferring pay broadcast (limited reception) information, and its insertion cycle is defined as 1 [s] or less.
In general, system packets PAT and PMT are inserted at intervals of 100 [ms] or less (system packet CAT is 1 [s] or less). When there is a large number of packets, the packet accumulation amount (overflow) is larger than the upper limit value of the system packet buffer (maximum value of the transport buffer 131).

  As an example, as shown in FIG. 10, arrival times tA (m−2), tA (m−1), tA (m), tB ′ (1), among a plurality of edited TS packets of MPEG2TS, TS packets including tB ′ (2), tB ′ (3), tB ′ (4), and tB ′ (5) are a system packet PMT, a video packet, a system packet PAT, a video packet, a system packet PAT, and a system, respectively. Assume that packets PMT, video packets, and audio packets are represented. That is, the recorded MPEG2TS-A includes a system packet at the end, and the recorded MPEG2TS-B includes a system packet at the beginning. When such a stream is combined as an edited MPEG2TS, an overflow of the system packet buffer (transport buffer 131) is caused, so that processing (remultiplexing) of the system packet is necessary.

In this case, as the definition of the insertion period in the system packet PMT, the arrival time tA (m−2) is set as the previous insertion (arrival) time prevT_PMT, and the arrival time tB ′ (3) that is the next time of the time prevT_PMT is newly inserted ( When the arrival time is newT_PMT, the relationship between the previous insertion (arrival) time prevT_PMT [ms] and the new insertion (arrival) time newT_PMT [ms] is (newT_PMT-prevT_PMT) ≦ 100 [ms].
It is necessary to satisfy. Further, as the definition of the insertion period in the system packet PAT, the relationship between the previous insertion (arrival) time prevT_PAT [ms] and the new insertion (arrival) time newT_PAT [ms] next to the previous insertion (arrival) time prevT_PAT is (newT_PAT). −prevT_PAT) ≦ 100 [ms]
It is necessary to satisfy. Further, as the definition of the insertion period in the system packet CAT, the relationship between the previous insertion time prevT_CAT [ms] and the new insertion time newT_CAT [ms] next to the previous insertion time prevT_CAT is (newT_CAT-prevT_CAT) ≦ 1000 [ms].
It is necessary to satisfy.

  Accordingly, the present invention is characterized in that the adjustment unit 2 executes the adjustment process (step S3) in consideration of the limitation on the upper limit value of the buffer of the T-STD 100 and the limitation on the insertion (arrival) time. To do. That is, as shown in FIG. 11, when TS packets including arrival times tA (m−2) and tB ′ (3) respectively represent system packets PMT, the adjustment unit 2 simply arrives. If only the adjustment time α is added to the time tB ′ (3), the relationship (newT_PMT−prevT_PMT)> 100 [ms] is established, and the constraint on the system packet PMT cannot be satisfied.

In the present invention, the coordinator 2 has a system packet to be inserted preferentially for the process of confirming whether or not there is enough space to put one system packet in the transport buffer 131 of the T-STD 100 Add processing to change the system packet to be inserted according to the following conditions.
As the condition, first, when there is a vacant space for inserting one system packet in the transport buffer 131 of the T-STD 100, a system packet (for example, PAT) that is originally scheduled to be inserted is inserted. That's fine. Second, the transport buffer 131 becomes full due to the first, and another system packet (for example, PMT) that appears next cannot be immediately inserted, and another system packet (PMT) If it is possible that the above-mentioned constraint cannot be satisfied, the system (for example, PAT) to be inserted is changed to another system packet (PMT) and forcibly inserted.

As the above improvement, when there is a space for inserting one system packet in the transport buffer 131 of the T-STD 100, the adjustment unit 2 is a system packet (for example, PAT) scheduled to be inserted at the arrival time newT. Even if is inserted, other system packets (for example, PMT) can be surely inserted. For this purpose, the adjustment unit 2 performs re-multiplexing using the following determination formula using a constant ΔTwait in which at least one system packet of system packets is cleared from the system packet buffer (transport buffer 131). To do. Note that the case where the output bit rate of the T-STD buffer (transport buffer 131) of the system stream is 1 [Mbps] is taken as an example. Therefore, as the definition of the insertion period in the system packets PMT, PAT, and CAT,
newT_PMT ≧ prevT_PMT + 100 [ms] −ΔTwait × 2,
newT_PAT ≧ prevT_PAT + 100 [ms] −ΔTwait × 2,
newT_CAT ≧ prevT_CAT + 1000 [ms] −ΔTwait × 2
It is necessary to satisfy. Here, the constant ΔTwait is
ΔTwait = 188 × 8/1000000 × 1000 [ms]
It is represented by

  As illustrated in FIG. 12, the adjustment unit 2 determines that another system packet (here, when the above-described expression {newT_PMT ≧ prevT_PMT + 100 [ms] −ΔTwait × 2}) holds when a system packet (for example, PAT) to be inserted is inserted. Then, it is determined that the PMT) must be inserted immediately, and a process for inserting another system packet (here, the PMT) is introduced.

For example, TS packets including arrival times tA (m−2) and tB ′ (3) respectively represent system packets PMT, and TS packets including arrival times tA (m) and tB ′ (2) are respectively determined. When the system packet PAT is represented (see FIG. 11), the adjustment unit 2 does not satisfy the T-STD restriction for the Blu-ray standard among the first to last system packets, and the system packet The system packet PAT including the arrival time tB ′ (2) is selected as a correction target system packet that does not satisfy the insertion period regulations in the PAT, PMT, and CAT, and is stored in the temporary storage unit 3.
The adjustment unit 2 reads the correction target system packet PAT from the temporary storage unit 3 when the adjustment time α has passed as a time for satisfying the above-described restrictions on the correction target system packet PAT. Here, it is assumed that the adjustment time α is a time corresponding to two TS packets, and the arrival time tB ′ (2) is advanced by the adjustment time α. In this case, the adjustment unit 2 adds the adjustment time α to the arrival time tB ′ (2) included in the correction target system packet PAT.
When the correction target system packet PAT including the arrival time {tB ′ (2) + α} is larger than the arrival time tB ′ (4), the video packet including the arrival time tB ′ (4) and the arrival time The audio packets including tB ′ (5) are arranged.
As a result, as shown in FIG. 12, in the present invention, it is possible to satisfy the restrictions of T-STD with respect to the Blu-ray standard and to satisfy the definition of the insertion period in the system packets PAT, PMT, and CAT.

  In the above formula {newT_PMT ≧ prevT_PMT + 100 [ms] −ΔTwait × 2}, for example, a value obtained by subtracting twice the constant ΔTwait from the specified insertion interval (100 [ms]) is assumed. This is an example assuming the possibility that system packets PAT and CAT are successively inserted. In the case of a stream in which the system packet CAT does not exist (only PAT / PMT exists), the above expression may be an expression obtained by subtracting the constant ΔTwait from the specified insertion interval (100 [ms]).

  Further, as an example, as shown in FIG. 13, a TS including arrival times tA (m−2), tA (m−1), and tA (m) among a plurality of TS packets of a single unedited MPEG2TS. Assume that the packets represent a system packet PAT, a system packet PMT, and a system packet PMT, respectively. In the terrestrial digital broadcasting, even if the system packet PMT and the system packet PAT exist side by side as described above, there is no problem as a terrestrial digital broadcasting standard, but such a stream is used when handled as a Blu-ray standard. When a single packet is used or edited (cut / combined), the transport buffer 131 of the T-STD 100 causes an overflow exceeding 512 [bytes], so that processing (remultiplexing) of the system packet is required.

  Therefore, as shown in FIG. 14, the adjustment unit 2 confirms whether or not there is a vacant space that can store one packet in the T-STD buffer (transport buffer 131). It is determined whether to re-multiplex the stream (system packet). When the adjustment unit 2 determines that the target stream (system packet) should not be remultiplexed, the adjustment unit 2 temporarily stores the packet in the temporary storage unit 3 and if there is an empty space in the T-STD buffer (transport buffer 131). If it is judged, it is re-multiplexed again. At this time, the adjustment unit 2 resets the arrival time included in the packet stored in the temporary storage unit 3. If the arrival time included in the other packets of the original code is earlier than the temporarily stored packet (system packet), the other packets of the original code are remultiplexed first.

When one system packet PMT is arranged independently, the adjustment unit 2 may apply the above formula {newT_PMT ≧ prevT_PMT + 100 [ms] −ΔTwait × 2}. On the other hand, as described above, when the two system packets PMT are present within 100 [ms] / 2, the adjustment unit 2 performs remultiplexing using the following determination formula. Therefore, as the definition of the insertion period in the system packet PMT,
newT_PMT ≧ prevT_PMT + 100 [ms] ÷ 2−ΔTwait × 2
It is necessary to satisfy.

  For example, when the arrival time of the first system packet PMT is prev_PMT, if the second system packet packet PMT exists within 100 [ms] / 2, this is the basic rule of the system packet PMT. The restriction of 1 within 100 [ms] can be complied with.

In this case, the adjustment unit 2 does not satisfy the T-STD restriction for the Blu-ray standard from among the first to last system packets, and defines the insertion period in the system packets PAT, PMT, and CAT. The system packet PMT including the arrival time tB ′ (2) is selected as the correction target system packet that is not satisfied, and is stored in the temporary storage unit 3.
The adjustment unit 2 reads the correction target system packet PMT from the temporary storage unit 3 when the adjustment time α has passed as a time for satisfying the above-described restrictions on the correction target system packet PMT. Here, the adjustment time α is (100 [ms] / 2) − (ΔTwait × 2), and the arrival time tB ′ (2) is decremented by the adjustment time α. In this case, the adjustment unit 2 adds the adjustment time α to the arrival time tB ′ (2) included in the correction target system packet PMT.
As a result, as shown in FIG. 15, in the present invention, it is possible to satisfy the restrictions of T-STD for the Blu-ray standard and to satisfy the definition of the insertion period in the system packets PAT, PMT, and CAT.

  Note that the present invention is not limited to setting an equal value such as 100 [ms] / 2, and a time interval that matches the transport buffer 131 may be set.

  In the present invention, the following processing may be added to the adjustment unit 2 as another embodiment.

  As a system packet related to the transport buffer 131 of the T-STD 100 of the Blu-ray standard, PAT / PMT / CAT is present at a constant insertion period. However, when the system packet CAT is not used as reproduction information, a process for converting or discarding the system packet CAT into a TS packet irrelevant to the transport buffer 131 is added to the adjustment unit 2, whereby the transport buffer 131. It is possible to reduce the amount of buffer accumulated in.

As processing, when the adjustment unit 2 detects the system packet CAT, processing for replacing the system packet CAT with a NULL packet is performed. As the arrival time indicated by the time stamp at this time, a value (arrival time) added to the system packet CAT may be used. Alternatively, the T-STD 100 may discard the system packet CAT itself.
By this processing, there are two types of PAT / PMT system packets related to the transport buffer 131 of the T-STD 100, so the probability that the transport buffer 131 overflows decreases. However, it is necessary to process the specified insertion interval in parallel.

  As described above, the transport stream correction apparatus 10 according to the present invention edits the recorded video data (recorded MPEG2TS) stored in the first apparatus conforming to the first standard (digital broadcasting standard) (cut editing / editing). When edited video data (edited MPEG2TS) is generated after being edited, it is copied to a second device (Blu-ray disc recording / playback device 30) that complies with the second standard (Blu-ray standard). In the case of (or moving), the constraint on the second standard can be satisfied. In this case, the data itself of the edited video data (edited MPEG2TS) is not changed, and the amount of increase / decrease in the data length can be suppressed as much as possible to correct the data inconsistency due to the difference in standards.

FIG. 1 is a diagram for explaining MPEG2TS. FIG. 2 shows a configuration of the virtual decoding unit (T-STD) 100. FIG. 3 is a diagram for explaining a problem of the conventional technique. FIG. 4 is a diagram for explaining a conventional technique. FIG. 5 is a diagram for explaining a problem of the conventional technique. FIG. 6 shows the configuration of the transport stream correction apparatus 10 of the present invention. FIG. 7 is a flowchart showing the operation of the transport stream correction apparatus 10 of the present invention. FIG. 8 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 9 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 10 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 11 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 12 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 13 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 14 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention. FIG. 15 is a diagram for explaining the operation of the transport stream correction apparatus 10 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input part 2 Temporary storage part 3 Adjustment part 4 Multiplexing part 5 Output part 10 Transport stream correction apparatus 20 Editing apparatus (1st apparatus)
30 Blu-ray disc recording / playback device (second device)
100 Virtual decoding unit (T-STD)
101 Separator 111 Transport Buffer 112 Multiplex Buffer 113 Elemental Buffer 121 Transport Buffer 122 Elemental Buffer 131 Transport Buffer 132 System Buffer 141 Video Decoder 142 Audio Decoder 143 System Control

Claims (6)

An input unit to which a first stream consisting of a plurality of packets stored in a first device conforming to the first standard is input;
An adjustment unit that changes an arrangement of the plurality of packets included in the first stream so as to satisfy a restriction on a second standard different from the first standard;
A transport stream correction device comprising: an output unit that re-multiplexes the plurality of packets whose arrangement has been changed by the adjustment unit and outputs the re-multiplexed packet to a second device that conforms to the second standard. The transport stream correction device according to claim 1,
Furthermore,
Comprising a virtual decoding unit assuming a decoding operation in the second device;
The virtual decryption unit
A separation unit that separates the plurality of packets included in the first stream into video packets, audio packets, and system packets; a video packet buffer; an audio packet buffer; and a system packet buffer.
The adjustment unit monitors the video packet buffer, the audio packet buffer, and the system packet buffer, and the video packet buffer, the audio packet buffer, and the system packet buffer are in the second standard. A transport stream correction device that changes an arrangement of the plurality of packets included in the first stream so as to satisfy the restriction in FIG. In the transport stream correction device according to claim 2,
Each of the plurality of packets includes arrival time information representing an arrival time of the packet;
The transport stream correction apparatus, wherein the adjustment unit changes the arrangement of the plurality of packets by changing the arrival time information. In the transport stream correction device according to claim 3,
The system packet is composed of a PAT (Program Association Table), a PMT (Program Map Table), and a CAT (Conditional Access Table).
The adjustment unit monitors the system packet buffer and changes the arrangement of the system packets so as to satisfy the specifications in the PAT, PMT, and CAT. A transport stream correction method using a computer connected to a first device conforming to a first standard and a second device conforming to a second standard different from the first standard,
An input step of inputting a first stream comprising a plurality of packets stored in the first device;
An adjustment step of changing an arrangement of the plurality of packets included in the first stream so as to satisfy a constraint on the second standard;
A transport stream correction method comprising: an output step of re-multiplexing the plurality of packets whose arrangement has been changed by the adjustment unit and outputting the re-multiplexed packets to the second device as a second stream.   The computer program which makes the said computer perform each step of the transport stream correction method of Claim 5.

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