ITU-T J 89-1999 Transport Mechanism for Component-Coded Digital Television Signals Using MPEG-2 4 2 2 P ML Including All Service Elements for Contribution and Primary Distribution ro.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU J .89 (09199) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital transmission of television signals Transport mechanism for component-coded digital television signals u

2、sing MPEG-2 4:2:2 PML including all service elements for contribution and primary distribution ITU-T Recommendation J.89 (Previously CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU J.89 (09/99) SERIES J: TRANSMISSION OF TELEVISION, SO

3、UND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital transmission of television signals Transport mechanism for component-coded digital television signals using MPEG-2 4:2:2 PML including all service elements for contribution and primary distribution ITU-T Recommendation J.89 (Previously CCITT Recomme

4、ndation) 48b2591 Obb8571 939 D ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-programme transmission Performance characteristics of analogue sound-programme circuits Equipment a

5、nd lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue television transmission Analogue television transmission over metallic lines and interconnection with radio-relay links Digi

6、tal transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Interactive systems for digital television distribution Transport of MPEG-2 signals on packetised networks Measurement of the quality of serv

7、ice Digital television distribution through local subscriber networks J.1-J.9 J.10-J. 19 J.20-J.29 5.30-5.39 5.40-5.49 J.50-J.59 J.60-J.69 5.70-5.79 5.8017.89 J.90-J.99 J.1O-J.109 J. 1 10-J. 129 J. 130-J. 139 J. 140-5.149 J. 150-J. 159 For further details, please refer to ITU-T List of Recommendatio

8、ns. ITU-T RECOMMENDATION 5.89 TRANSPORT MECHANISM FOR COMPONENT-CODED DIGITAL TELEVISION SIGNALS USING MPEG-2 4:2:2 PML INCLUDING ALL SERVICE ELEMENTS FOR CONTRIBUTION AND PRIMARY DISTRIBUTION Summary This Recommendation specifies the general transport mechanism for conveying all service elements ne

9、eded for contribution and primary distribution applications of TV programs using WEG-2 4:2:2 profile at Main level compression. The service elements provided to WEG-2 coding systems are assumed to be (4:2:2) component video signals, studio quality audio signals and various all users of this Recommen

10、dation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation H.222.0 (1995) I ISO/IEC 13818-1 : 1996, Infor

11、mation technology - Generic coding of moving pictures and associated audio information: Systems. ITU-T Recommendation H.262 (1995) I ISOAEC 13818-2:1996, Information technology - Generic coding of moving pictures and associated audio information: Video. ISOAEC 1 1 172-3: 1993, Information technology

12、 - Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s - Part 3: Audio. ISOnEC 1381 8-7: 1997, Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC). SMPTE 302-1998, Television

13、- Mapping of AES3 Data into MPEG-2 Transport Stream. Recommendation ITU-R BT. 1364 (1998), Format of ancillary data signals carried in digital component studio interfaces. Recommendation ITU-R BT. 1304 (1 997), Checksum for error detection and status information in interfaces conforming with Recomme

14、ndations ITU-R BT. 656 and ITU-R BT. 799. Recommendation ITU-R BT. 1366 (1998), Transmission of time code and control code in the ancillary data space of a digital television stream according to ITU-R BT.656, ITU-R BT. 799 and ITU-R BT. 1120. Recommendation ITU-R BT. 1305 (1997), Digital audio and a

15、uxiliary data as ancillary data signals in interfaces conforming to Recommendations ITU-R BT.656 and ITU-R BT. 799. Recommendation ITU-R BT.653-3 (1998), Teletext systems. Recommendation ITU-R BT.601-5 (1 995), Studio encodingparameters of digital television for standard 4:3 and wide-screen I6:9 asp

16、ect ratios. ITU-T Recommendation J. 13 1 (1 998), Transport of MPEG-2 signals in PDH networks. ITU-T Recommendation J. 132 (1 998), Transport of MPEG-2 signals in SDH networks. Recommendation 5.89 (09/99) 1 141 ITU-T Recommendation 5.83 (1 997), Digital multi-programme srstems for television, sound

17、and data services for cable distribution. 151 ITU-T Recommendation J.82 (1 996), Transport of MPEG-2 constant bit rate television signals in B-ZSDN. 3 Terms and definitions This Recommendation defines the following terms: 3.1 access unit: A coded representation of a presentation unit. In the case of

18、 audio, an access unit is the coded representation of an audio frame. In the case of video, an access unit includes all the coded data for a picture, and any stuffing that follows it, up to, but not including, the start of the next access unit. If a picture is not proceeded by a group-start-code or

19、a sequence-header-code, the access unit begins with the picture-star-code. If a picture is preceded by a groupstart-de andor a sequence-header-code, the access unit begins with the first byte of the first of these start codes. If it is the last picture preceding a sequence-end-code in the bitstream,

20、 all bytes between the last byte of the coded picture and the sequence-end-code (including the sequence-end-code) belong to the access unit. 3.2 bit rate: The rate at which the compressed bit stream is delivered from the channel to the input of a decoder. 3.3 unit is decoded in the system target dec

21、oder. decoding time-stamp: A field that may be present in a PES packet header that indicates the time that an access 3.4 multi-program transport stream as described in 2.4.3 of ITU-T Rec. H.222.0 I ISOAEC 13818-1 i. packet identifier: A unique integer value used to identi6 elementary streams of a pr

22、ogram in a single or 3.5 payload: Payload refers to the bytes which follow the header bytes in a packet. For example, the payload of some transport stream packets includes a PESqacket-header and its PESgacket-data-bytes, or pointer-field and PSI sections, or private data: but a PESqacketqayload cons

23、ists of only PESqacket-data-bytes. The transport stream packet header and adaptation fields are not payload. 3.6 PES packet: The data structure used to carry elementary stream data. A PES packet consists of a PES packet header followed by a number of contiguous bytes fiom an elementary data stream.

24、It is a layer in the system coding syntax described in 2.4.3.6 ofITU-T Rec. H.222.0 I ISO/IEC 13818-1 i. 3.7 PES packet header: The leading fields in a PES packet up to and not including the PESqacket-data-byte fields, where the stream is not a padding stream. In the case of a padding stream the PES

25、 packet header is similarly defined as the leading fields in a PES packet up to and not including padding-byte fields. 3.8 PES Stream: A PES stream consists of PES packets, all of whose payloads consist of data fiom a single elementary stream, and all of which have the same stream-id. Specific seman

26、tic constraints apply. Refer to Intro. 4 of IW-T Rec. H.222.0 I ISOAEC 13818-1 i. 3.9 presentation unit is presented in the system target decoder. presentation time-stamp: A field that may be present in a PES packet header that indicates the time that a 3.10 presentation unit: A decoded audio access

27、 unit or a decoded picture. 3.11 program clock reference: A time stamp in the transport stream from which decoder timing is derived. 3.12 program specific information: PSI consists of normative data which is necessary for the demultiplexing oftransport streams and the successful regeneration of prog

28、rams and is described in 2.4.4 of ITU-T Rec. H.222.0 I ISO/IEC 13818-1 i. An example of privately defined PSI data is the non-mandatory network information table. 3.13 reserved: The term “reserved“, when used in the clauses defining the coded bit stream, indicates that the value may be used in the f

29、uture for IS0 defined extensions. Unless otherwise specified within ITU-T Rec. H.222.0 I ISOAEC 13818-1 i, all reserved bits shall be set to “1“. 2 Recommendation 5.89 (09199) 48b25L Obb577 357 9 3.14 of a presentation unit. 3.15 continuity_counter field. time-stamp: A term that indicates the time o

30、f a specific action such as the arrival of a byte or the presentation transport stream packet header: The leading fields in a transport stream packet, up to and including the 4 Abbreviations This Recommendation uses the following abbreviations: AAC Advanced Audio Coding ANC Ancillary DTS Decoding Ti

31、me Stamp EDH Error Detection and Handling GP Group of Pictures LTC Longitudinal Time Code WEG Moving Picture Experts Group PCR Program Clock Reference PDH Plesiochronous Digital Hierarchy PES Packetized Elementary Stream PSI Program Specific Information PTS Presentation Time Stamp SDH Synchronous Di

32、gital Hierarchy SEQ Sequences TS Transport Stream VBI Vertical Blanking Interval VITC Vertical Interval Time Code VITS Vertical Interval Test Signals 5 Transport mechanism This Recommendation follows the method of describing bit stream syntax and uses symbols given in clause 2 of ITU-T RE. H.222.0 1

33、 ISOAEC 13818-1 i. 5.1 Systems layer PCR repetition rate: The PCR shall occui typically every field interval (16.6 ms for 525/60 TV system and 20 ms for 625150 TV system) and at least every 1 O0 ms. PCR position: PCRs (and adaptation fields) shall be inserted either in the video stream or in a separ

34、ate PCR stream. 5.2 Video 5.2.1 Video PES format Stream-Id PESqacket-length: I 1 1 1 O xxxx“ (video stream number xxxx). “0x0000“ (neither specified nor bounded and allowed only in PES packets whose payload consists of bytes from a video elementary stream contained in transport stream packets). Reco

35、mmendation 5.89 (09199) 3 data-alignment-indication: PTS-DTS-flags: “1“ (the PES packet header is immediately followed by the video start code). Alignment type 0x03 (GOP or SEQ). “10“ (PTS fields shall be present in the PES packet header). “1 l“(Both the PTS fields and DTS fields shall be present in

36、 the PES packet header). 5.2.2 Video layers Profile and Level: Sequence header repetition rate: The 4:2:2 profile at Main level 2 shall be implemented. Minimum every second. 5.3 Compressed audio 5.3.1 PES format Stream-Id: data-alignmentjndicator: PTS-DTS-flags: 5.3.2 Audio layer MPEG-1 Layer II 3 o

37、r WEG-2 AAC 4 shall be implemented. “ 1 lOxxxxx“ (audio stream number xxxxx). “1“ (the PES packet header is immediately followed by the audio sync word). Alignment-type Ox01 (Sync word). “10“ (PTS fields shall be present in the PES packet header). 5.3.2.1 Coding for-stereo Coding: Bit rate: Sampling

38、 frequency: Emphasis: 5.3.2.2 Coding for multichannel Coding: Number of channels: Bit rate per channel: Sampling frequency: Emphasis: MPEG-1 Layer II 384 kbit/s other bit rates optional 48 kHz no emphasis MPEG-2 AAC up to 6 up to 80 kbit/s 48 kHz no emphasis 5.4 Uncompressed audio The preferred meth

39、od for transport of uncompressed audio, including SDI embedded audio (Recommen- dation ITU-R BT.1305 9) is according to SMFTE 302 51. 4 Recommendation 5.89 (09/99) 5.5 Ancillary data ANC-data-field( ) while (!bytealigned) zero-bit 1 for (i=O; iCN1; i*) Ancillary data is defined by Recommendation ITU

40、-R BT.1364 6, and includes checksum, timecode and uncompressed digital audio defined in Recommendation ITU-R BT.1304 7, Recommendation ITU-R BT.1366 SI, and Recommendation IT-R BT.1305 9, respectively. The following applies for transport of the ancillary data. This method may optionally be applied t

41、o audio stream according to Recommendation ITU-R BT. 1305 9. 1 “1“ 5.5.1 PES packet format st u ffhgbyte 1 1 ANC-data-field ( ) Stream-Id 8 “1111 1111“ data-alignment-indicator : line-number horizontal-offset - PTS-DTS-flags: 10 bslbf 10 uimsbf PESqacket-data-byte: data-ID DBN-SDID “101 1 1101“ (pri

42、vate-stream-1). 10 bslbf 10 bslbf “1“ Alignment-type “0x02“ (Video Access Unit). (the PES packet header is immediately followed by the sync word). data-count for (i+, i=data-count; i*) “10“ (PTS fields shall be present in the PES packet header). 10 bslbf These bytes are coded in accordance with the

43、ANC-data( ) syntax as defined below. user-data-word 1 Table VJ.89 - ANC data field 10 bslbf Syntax checksum-word 1 I No. of bits I 10 bslbf Mnemonic I ANC-data( ) for (id; iN; i*) I - - NOTE - The ANC-data-field ( ) consists of a header (“OxOOO“, line-number, horizontaloffset) followed by the ancill

44、ary data packet content (as defined in Recommendation -R BT.1364 6) starting after the ancillary data flag. line-number: This 10-bit word contains the line number (1 to 625 and 1 to 525 respectively). horizontal-offset: This 10-bit word contains the horizontal address (O to 857 and O to 863 respecti

45、vely) in a line indicated by the line-number. Recommendation J.89 (09/99) 5 5.6 Data The following PES/TS scheme allows optional user data channels (excluding ancillary data) to be transferred at any data rate. The I*) data-unit-id I dataldentifier 8 uimsbf 8 I uimsbf data-unit-length if (data-unit-

46、id = = stuffingunit) stuffingfield 8 uimsbf 43*8 bslbf Syntax data-field ( ) else data-field ( ) No. of bits Mnemonic The syntax for data field is given in Table 3. reserved fieldgarity Table 3/5.89 - Teletext data field 2 bslbf 1 bslbf framingcode magazine-andjacket-address data-block 1 8 bslbf 16

47、bslbf 320 bslbf I I line-offset I 5 uimsbf I Recommendation J.89 (09/99) 7 5.7.3 data identifier: This 8-bit field identifies the type of data carried in the PES packet. It is coded as indicated in Table 4. Semantics for PES data field OXOO-OXOF 0x1 0-0x1 F Table 415.89 - Data identifier reserved TX

48、T data i Value I Data identifier I 0x0-0x7F 0x80 reserved TC data 0x8 1 -0x9E Ox9F reserved testline OXAO OxA1-OxFF The data identifier shall be set to the same value for each PES packet conveying data in the same Teletext data stream. encoder information reserved data unit id: This 8-bit fieid iden

49、tifies the type of data unit. It is coded as indicated in Table 5. Table 5/5.89 - Data unit id ox00 oxo 1 1 Value I Data unit id I _ reserved EBU data line 0x02 Ox03 .- teletext system B, 625-line system, non-subtitle data teletext system B, 625-line system, subtitle data 0x04 0x05 teletext system A, 625-line system reserved 0x06 0x07-0x1 O teletext system C, 625-line system reserved 0x1 1 0x12 teletext system A, 525-line system reserved 0x13 0x14 teletext system B, 525-line system reserved ox15 0x