《BS-ISO-IEC-14496-15-2004.pdf》由会员分享，可在线阅读，更多相关《BS-ISO-IEC-14496-15-2004.pdf（32页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO/IEC 14496-15:2004 Information technology Coding of audio-visual objects Part 15: Advanced Video Coding (AVC) file format ICS 35.040 ? BS ISO/IEC 14496-15:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 April 20
2、04 BSI 29 April 2004 ISBN 0 580 43726 4 National foreword This British Standard reproduces verbatim ISO/IEC 14496-15:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/37, Coding of picture, audio, multimedia and hyper
3、media information, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue unde
4、r the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl
5、ication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; m
6、onitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to v, a blank page, pages 1 to 23 and a back cover. The BSI copyright notice displayed in this documen
7、t indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Reference number ISO/IEC 14496-15:2004(E) INTERNATIONAL STANDARD ISO/IEC 14496-15 First edition 2004-04-15 Information technology Coding of audio-visual objects Part 15: Advanced Video Coding (AV
8、C) file format Technologies de linformation Codage des objets audiovisuels Partie 15: Format de fichier de codage vido avanc (AVC) BS ISO/IEC 1449615:2004 ii BS ISO/IEC 1449615:2004 iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms, definitions, symbols and abbre
9、viated terms.1 3.1 Terms and definitions.1 3.2 Symbols and abbreviated terms2 4 Extensions to the ISO Base Media File Format2 4.1 Introduction .2 4.2 File identification.2 4.3 Independent and Disposable Samples Box .2 4.4 Sample groups 3 4.4.1 Introduction .3 4.4.2 SampleToGroup Box 4 4.4.3 SampleGr
10、oupDescription Box.5 4.5 Random access recovery points.6 4.5.1 Syntax.6 4.5.2 Semantics 6 4.6 Representation of new structures in movie fragments.7 5 AVC elementary streams and sample definitions .7 5.1 Elementary stream structure .7 5.2 Sample and Configuration definition9 5.2.1 Introduction .9 5.2
11、.2 Canonical order and restrictions.9 5.2.3 AVC sample structure definition .11 5.2.4 Decoder configuration information.11 5.3 Derivation from ISO Base Media File Format.13 5.3.1 Introduction .13 5.3.2 AVC File type and identification13 5.3.3 AVC Track Structure.13 5.3.4 AVC Video Stream Definition.
12、13 5.3.5 AVC parameter set stream definition15 5.3.6 Template fields used.16 5.3.7 Visual width and height16 5.3.8 Parameter sets 17 5.3.9 Decoding time (DTS) and composition time (CTS)17 5.3.10 Sync sample (IDR).17 5.3.11 Shadow sync .17 5.3.12 Layering and sub-sequences 18 5.3.13 Alternate streams
13、 and switching pictures21 5.3.14 Random access recovery points.23 5.3.15 Hinting23 BS ISO/IEC 1449615:2004 iv Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National
14、bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Oth
15、er international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rule
16、s given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires appr
17、oval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 14496-15 was prepared by
18、 Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 14496 consists of the following parts, under the general title Information technology Coding of audio-visual objects: Part 1: Systems Part 2:
19、 Visual Part 3: Audio Part 4: Conformance testing Part 5: Reference software Part 6: Delivery Multimedia Integration Framework (DMIF) Part 7: Optimized reference software for coding of audio-visual objects Technical Report Part 8: Carriage of ISO/IEC 14496 contents over IP networks Part 9: Reference
20、 hardware description Technical Report Part 10: Advanced Video Coding Part 11: Scene description and application engine Part 12: ISO base media file format Part 13: Intellectual Property Management and Protection (IPMP) extensions Part 14: MP4 file format Part 15: Advanced Video Coding (AVC) file fo
21、rmat Part 16: Animation Framework eXtension (AFX) Part 17: Streaming text format Part 18: Font compression and streaming Part 19: Synthesized texture stream BS ISO/IEC 1449615:2004 v Introduction The Advanced Video Coding (AVC) standard, jointly developed by the ITU-T and ISO/IEC SC29/WG11 (MPEG), o
22、ffers not only increased coding efficiency and enhanced robustness, but also many features for the systems that use it. To enable the best visibility of, and access to, those features, and to enhance the opportunities for the interchange and interoperability of media, this part of ISO/IEC 14496 defi
23、nes a storage format for video streams compressed using AVC. This part of ISO/IEC 14496 defines a storage format based on, and compatible with, the ISO Base Media File Format (ISO/IEC 14496-12 and ISO/IEC 15444-12), which is used by the MP4 file format (ISO/IEC 14496-14) and the Motion JPEG 2000 fil
24、e format (ISO/IEC 15444-3) among others. This part of ISO/IEC 14496 enables AVC video streams to: be used in conjunction with other media streams, such as audio; be used in an MPEG-4 systems environment, if desired; be formatted for delivery by a streaming server, using hint tracks; inherit all the
25、use cases and features of the ISO Base Media File Format on which MP4 and MJ2 are based. This part of ISO/IEC 14496 may be used as a standalone specification; it specifies how AVC content shall be stored in an ISO Base Media File Format compliant format. However, it is normally used in the context o
26、f a specification, such as the MP4 file format, derived from the ISO Base Media File Format, that permits the use of AVC video. The ISO Base Media File Format is becoming increasingly common as a general-purpose media container format for the exchange of digital media, and its use in this context sh
27、ould accelerate both adoption and interoperability. Extensions to the ISO Base Media File Format are defined here to support the new systems aspects of the AVC codec. BS ISO/IEC 1449615:2004 1 Information technology Coding of audio-visual objects Part 15: Advanced Video Coding (AVC) file format 1 Sc
28、ope This part of ISO/IEC 14496 specifies the storage format for AVC (ISO/IEC 14496-10 | ITU-T Rec. H.264) video streams. The storage of AVC content uses the existing capabilities of the ISO Base Media File Format but also defines extensions to support the following features of the AVC codec: Switchi
29、ng pictures: To enable switching between different coded streams and substitution of pictures within the same stream. Sub-sequences and layers: Provides a structuring of the dependencies of a group of pictures to provide for a flexible stream structure (e.g. in terms of temporal scalability and laye
30、ring). Parameter sets: The sequence and picture parameter set mechanism decouples the transmission of infrequently changing information from the transmission of coded macroblock data. Each slice containing the coded macroblock data references the picture parameter set containing its decoding paramet
31、ers. In turn, the picture parameter set references a sequence parameter set that contains sequence level decoding parameter information. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited appl
32、ies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 14496-1:2001, Information technology Coding of audio-visual objects Part 1: Systems ISO/IEC 14496-10, Information technology Coding of audio-visual objects Part 10: Advanced video c
33、oding | ITU-T Rec. H.264, Advanced video coding for generic audiovisual services ISO/IEC 14496-12, Information technology Coding of audio-visual objects Part 12: ISO base media file format (technically identical to ISO/IEC 15444-12) 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and d
34、efinitions For the purposes of this document, the terms and definitions given in ISO/IEC 14496-1, ISO/IEC 14496-10 | ITU-T Rec. H.264 and the following apply. BS ISO/IEC 1449615:2004 2 3.1.1 parameter set a sequence parameter set or a picture parameter set, as defined in ISO/IEC 14496-10 NOTE This t
35、erm is used to refer to both types of parameter sets. 3.1.2 parameter set elementary stream elementary stream containing samples made up of only sequence and picture parameter set NAL units synchronized with the video elementary stream 3.1.3 video elementary stream elementary stream containing acces
36、s units made up of NAL units for coded picture data 3.2 Symbols and abbreviated terms AVC Advanced Video Coding ISO/IEC 14496-10 HRD Hypothetical Reference Decoder IDR Instantaneous Decoding Refresh NAL Network Abstraction Layer PPS Picture Parameter Set SEI Supplementary Enhancement Information SPS
37、 Sequence Parameter Set 4 Extensions to the ISO Base Media File Format 4.1 Introduction This clause documents technical additions to the ISO Base Media File Format, which can be used when storing AVC streams. However, these additions could also be used by other media, if they are defined to use them
38、. They are therefore documented here separately. 4.2 File identification The brand avc1 shall be used to indicate that extensions conformant with this section are used in a file. The use of avc1 as a major-brand may be permitted by specifications; in that case, that specification defines the file ex
39、tension and required behaviour. 4.3 Independent and Disposable Samples Box Box Types: sdtp Container: Sample Table Box (stbl) Mandatory: No Quantity: Exactly one This optional table answers three questions about sample dependency: 1) Does this sample depend on others (is it an I-picture)? 2) Do no o
40、ther samples depend on this one? 3) Does this sample contain multiple (redundant) encodings of the data at this time-instant (possibly with different dependencies)? BS ISO/IEC 1449615:2004 3 In the absence of this table: 1) the sync sample table answers the first question; in most video codecs, I-pi
41、ctures are also sync points, 2) the dependency of other samples on this one is unknown, 3) the existence of redundant coding is unknown. When performing trick modes, such as fast-forward, it is possible to use the first piece of information to locate independently decodable samples. Similarly, when
42、performing random access, it may be necessary to locate the previous sync point or random access recovery point, and roll-forward from the sync point or the pre-roll starting point of the random access recovery point to the desired point. While rolling forward, samples on which no others depend need
43、 not be retrieved or decoded. The value of sample-is-depended-on is independent of the existence of redundant codings. However, a redundant coding may have different dependencies from the primary coding; if redundant codings are available, the value of sample-depends-on documents only the primary co
44、ding. The size of the table, sample_count is taken from the sample_count in the Sample Size Box (stsz) or Compact Sample Size Box (stz2). 4.3.1.1 Syntax aligned(8) class SampleDependencyTypeBox extends FullBox(sdtp, version = 0, 0) for (i=0; i sample_count; i+) unsigned int(2) reserved = 0; unsigned
45、 int(2) sample-depends-on; unsigned int(2) sample-is-depended-on; unsigned int(2) sample-has-redundancy; 4.3.1.2 Semantics sample-depends-on takes one of the following four values: 0: the dependency of this sample is unknown; 1: this sample does depend on others (not an I picture); 2: this sample do
46、es not depend on others (I picture); 3: reserved. sample-is-depended-on takes one of the following four values: 0: the dependency of other samples on this sample is unknown; 1: other samples depend on this one (not disposable); 2: no other sample depends on this one (disposable); 3: reserved. sample
47、-has-redundancy takes one of the following four values: 0: it is unknown whether there is redundant coding in this sample; 1: there is redundant coding in this sample; 2: there is no redundant coding in this sample; 3: reserved. 4.4 Sample groups 4.4.1 Introduction This clause specifies a generic me
48、chanism for representing a partition of the samples in a track. A sample grouping is an assignment of each sample in a track to be a member of one sample group, based on a BS ISO/IEC 1449615:2004 4 grouping criterion. A sample group in a sample grouping is not limited to being contiguous samples and
49、 may contain non-adjacent samples. As there may be more than one sample grouping for the samples in a track, each sample grouping has a type field to indicate the type of grouping. For example, a file might contain two sample groupings for the same track: one based on an assignment of sample to layers and another to sub- sequences. Sample groupings are represented by two