1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T J.187TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2002) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Miscellaneous Transport mechanism for component-coded digital high-definition television s
2、ignals using MPEG-2 video coding including all service elements for contribution and primary distribution ITU-T Recommendation J.187 ITU-T J-SERIES RECOMMENDATIONS CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations J.1J.9 General speci
3、fications for analogue sound-programme transmission J.10J.19 Performance characteristics of analogue sound-programme circuits J.20J.29 Equipment and lines used for analogue sound-programme circuits J.30J.39 Digital encoders for analogue sound-programme signals J.40J.49 Digital transmission of sound-
4、programme signals J.50J.59 Circuits for analogue television transmission J.60J.69 Analogue television transmission over metallic lines and interconnection with radio-relay links J.70J.79 Digital transmission of television signals J.80J.89 Ancillary digital services for television transmission J.90J.
5、99 Operational requirements and methods for television transmission J.100J.109 Interactive systems for digital television distribution J.110J.129 Transport of MPEG-2 signals on packetised networks J.130J.139 Measurement of the quality of service J.140J.149 Digital television distribution through loc
6、al subscriber networks J.150J.159 IPCablecom J.160J.179 Miscellaneous J.180J.199 Application for Interactive Digital Television J.200J.209 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. J.187 (07/2002) i ITU-T Recommendation J.187 Transport mechanism for component
7、-coded digital high-definition television signals using MPEG-2 video coding including all service elements for contribution and primary distribution Summary This Recommendation specifies the general transport mechanism for conveying all the service elements required for contribution and primary dist
8、ribution applications of TV programs whose vertical resolution is quite high compared to 525/60 or 625/50 television systems (e.g. 1125/60 system) using the MPEG-2 4:2:2 profile or Main profile at High level compression. The service elements provided to MPEG-2 coding systems are assumed to be (4:2:2
9、) component video signals, studio quality audio signals and various data signals, e.g. time code. This Recommendation ensures the compatibility on the level of the bit-stream into a decoder. It is based on and is in conformity with the MPEG-2 standard ITU-T Rec. H.222.0 | ISO/IEC 13818-1. Source ITU
10、-T Recommendation J.187 was prepared by ITU-T Study Group 9 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 July 2002. ii ITU-T Rec. J.187 (07/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunicatio
11、ns. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication
12、Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of inform
13、ation technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agenc
14、y. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Ri
15、ghts, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implement
16、ors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. J.18
17、7 (07/2002) iii CONTENTS Page 1 Scope 1 2 References. 1 2.1 Normative references 1 2.2 Informative references 2 3 Terms, definitions and acronyms 2 4 Transport mechanism 3 4.1 Systems layer 3 4.2 Video 3 4.2.1 Video PES format. 3 4.2.2 Video layers 3 4.3 Compressed audio 3 4.4 Uncompressed audio 3 4
18、.5 Ancillary data . 3 4.5.1 PES packet format 4 4.6 Data. 5 4.6.1 PES format 5 4.7 Data lines 5 4.7.1 PES packet format 5 4.7.2 Syntax for PES data field . 5 4.7.3 Semantics for PES data field 5 4.8 Time code . 6 4.8.1 PES packet format 6 4.8.2 Syntax for PES data field . 6 4.8.3 Semantics for PES d
19、ata field 6 4.9 Encoder information. 7 5 Channel adaptations 7 ITU-T Rec. J.187 (07/2002) 1 ITU-T Recommendation J.187 Transport mechanism for component-coded digital high-definition television signals using MPEG-2 video coding including all service elements for contribution and primary distribution
20、 1 Scope This Recommendation specifies the general transport mechanism for conveying all the service elements required for contribution and primary distribution applications of TV programs whose vertical resolution is quite high compared to 525/60 or 625/50 television systems (e.g. 1125/60 system) u
21、sing the MPEG-2 4:2:2 profile or Main profile at High level compression. The service elements provided to MPEG-2 coding systems are assumed to be (4:2:2) component video signals, studio quality audio signals and various data signals e.g. time code. This Recommendation ensures the compatibility on th
22、e level of the bit-stream into a decoder. It is based on, and is in conformity with the MPEG-2 standard ITU-T Rec. H.222.0 | ISO/IEC 13818-1. The scope of this Recommendation is basically in accordance with ITU-T Rec. J.89, which specifies the transport mechanism of 525/60 and 625/50 television syst
23、ems, excluding the compatibility for any VBI data specific to composite video signals. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the edition
24、s indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation 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 I
25、TU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 2.1 Normative references ITU-T Recommendation H.222.0 (2000) | ISO/IEC 13818-1:2000, Information technology Generic coding
26、of moving pictures and associated audio information: Systems. ITU-T Recommendation H.262 (2000) | ISO/IEC 13818-2:2000, Information technology Generic coding of moving pictures and associated audio information: Video. ITU-T Recommendation J.89 (1999), Transport Mechanism for component-coded digital
27、television signals using MPEG-2 4:2:2PML including all service elements for contribution and primary distribution. ITU-R Recommendation BT.1304 (1997), Checksum for error detection and status information in interfaces conforming with Recommendations ITU-R BT.656 and ITU-R BT.799. ITU-R Recommendatio
28、n BT.1305 (1997), Digital audio and auxiliary data as ancillary data signals in interfaces conforming to Recommendations ITU-R BT.656 and ITU-R BT.799. ITU-R Recommendation BT.1364 (1998), Format of ancillary data signals carried in digital component studio interfaces. ITU-R Recommendation BT.1366 (
29、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. 2 ITU-T Rec. J.187 (07/2002) 2.2 Informative references SMPTE 12M-1999, Television, Audio and Film Time and Control Code. 3 Terms, d
30、efinitions and acronyms This Recommendation defines the following terms: 3.1 access unit: A coded representation of a presentation unit. In the case of 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,
31、 and any stuffing that follows it, up to, but not including, the start of the next access unit. If a picture is not preceded by a group_start_code or a sequence_header_code, the access unit begins with the picture_start_code. If a picture is preceded by a group_start_code and/or a sequence_header_co
32、de, 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, 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
33、decoding time-stamp: A field that may be present in a PES packet header that indicates the time that an access unit is decoded in the system target decoder. 3.3 packet identifier: A unique integer value used to identify elementary streams of a program in a single or multi-program transport stream as
34、 described in 2.4.3 of ITU-T Rec. H.222.0 | ISO/IEC 13818-1. 3.4 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 PES_packet_header and its PES_packet_data_bytes, or pointer_field and PSI sections, or
35、 private data; however, a PES_packet_payload consists of only PES_packet_data_bytes. The transport stream packet header and adaptation fields are not payload. 3.5 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
36、 contiguous bytes from an elementary data stream. It is a layer in the system coding syntax described in 2.4.3.6 of ITU-T Rec. H.222.0 | ISO/IEC 13818-1. 3.6 PES packet header: The leading fields in a PES packet up to and not including the PES_packet_data_byte fields, where the stream is not a paddi
37、ng stream. In the case of a padding stream the PES packet header is similarly defined as the leading fields in a PES packet up to and not including padding_byte fields. 3.7 PES stream: A PES stream consists of PES packets, all of whose payloads consist of data from a single elementary stream, and al
38、l of which have the same stream_id. Specific semantic constraints apply. Refer to Intro. 4 of ITU-T Rec. H.222.0 | ISO/IEC 13818-1. 3.8 presentation time-stamp: A field that may be present in a PES packet header that indicates the time that a presentation unit is presented in the system target decod
39、er. 3.9 presentation unit: A decoded audio access unit or a decoded picture. 3.10 program clock reference: A time-stamp in the transport stream from which decoder timing is derived. 3.11 reserved: The term “reserved“, when used in the clauses defining the coded bit stream, indicates that the value m
40、ay be used in the future for ISO-defined extensions. Unless otherwise specified within ITU-T Rec. H.222.0 | ISO/IEC 13818-1, all reserved bits shall be set to “1“. 3.12 time-stamp: A term that indicates the time of a specific action such as the arrival of a byte or the presentation of a presentation
41、 unit. ITU-T Rec. J.187 (07/2002) 3 3.13 transport stream packet header: The leading fields in a transport stream packet, up to and including the continuity_counter field. 4 Transport mechanism This Recommendation follows the method of describing bit stream syntax and uses symbols given in clause 2
42、of ITU-T Rec. H.222.0 | ISO/IEC 13818-1. 4.1 Systems layer PCR repetition rate: The PCR shall occur typically every field interval (e.g. 16.6 ms for the 1125/60 TV system) and at least every 100 ms. PCR position: PCRs (and adaptation fields) shall be inserted either in the video stream or in a separ
43、ate PCR stream. 4.2 Video 4.2.1 Video PES format Stream_Id: “1110 xxxx“ (video stream number xxxx). PES_packet_length: “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). data_a
44、lignment_indication: “1“ (the PES packet header is immediately followed by the video start code). Alignment type 0x03 (GOP or SEQ). PTS_DTS_flags: “10“ (PTS fields shall be present in the PES packet header). “11“(Both the PTS fields and DTS fields shall be present in the PES packet header). 4.2.2 Vi
45、deo layers Profile: The MPEG-2 4:2:2 profile or Main profile shall be implemented. Level: The MPEG-2 High level shall be implemented. 4.3 Compressed audio The PES mapping of compressed audio is defined in ITU-T Rec. J.89. 4.4 Uncompressed audio The PES mapping of uncompressed audio is defined in ITU
46、-T Rec. J.89. 4.5 Ancillary data Ancillary data is defined by ITU-R Rec. BT.1364 and includes checksum, time code and uncompressed digital audio defined in ITU-R Rec. BT.1304, ITU-R Rec. BT.1366 and ITU-R Rec. BT.1305, respectively. The following applies to transport of the ancillary data. This meth
47、od may optionally be applied to the audio stream according to ITU-R Rec. BT.1305. 4 ITU-T Rec. J.187 (07/2002) 4.5.1 PES packet format Stream_Id: “1011 1101“ (private_stream_1). data_alignment_indicator: “1“ (the PES packet header is immediately followed by the sync word). Alignment_type “0x02“ (Vid
48、eo Access Unit). PTS_DTS_flags: “10“ (PTS fields shall be present in the PES packet header). PES_packet_data_byte: These bytes are coded in accordance with the ANC_data ( ) syntax as defined in Table 1. Table 1/J.187 ANC data field Syntax No. of bits Mnemonic ANC_data ( ) for (i=0; iN; i+) ANC_data_
49、field ( ) while (!byte_aligned) zero_bit 1 “1“ for (i=0; iN1; i+) stuffing_byte 8 “1111 1111“ ANC_data_field ( ) “0x00“ 6 bslbf Y/C_identifier 1 bslbf line_number 11 uimsbf horizontal_offset 12 uimsbf data_ID 10 bslbf DBN_SDID 10 bslbf data_count 10 bslbf for (i=0, idata_count; i+) user_data_word 10 bslbf checksum_word 10 bslbf NOTE The ANC_data_field ( ) consists of a header which consists of “0x000“, Y/C_identifier (0:Y, 1:C), line_number and horizontal_offset followed by the ancillary data packet content (as defined
