1、 Reference numberISO/IEC 13818-7:2006/Amd.1:2007(E)ISO/IEC 2007Information technology Generic coding of moving pictures and associated audio information Part 7: Advanced Audio Coding (AAC) AMENDMENT 1: Transport of MPEG Surround in AAC Technologies de linformation Codage gnrique des images animes et
2、 du son associ Partie 7: Codage du son avanc (AAC) AMENDEMENT 1: Transport de priphrique MPEG dans AAC International Organization for Standardization (ISO), 2007. All rights reserved. International Electrotechnical Commission (IEC), 2007. All rights reserved. NOT FOR RESALE. Amendment 1:2008 toNatio
3、nal Standard of CanadaCAN/CSA-ISO/IEC 13818-7:06Amendment 1:2007 to International Standard ISO/IEC 13818-7:2006 has been adopted without modification(IDT) as Amendment 1:2008 to CSA Standard CAN/CSA-ISO/IEC 13818-7:06. This Amendment wasreviewed by the CSA Technical Committee on Information Technolo
4、gy (TCIT) under the jurisdiction of theStrategic Steering Committee on Information Technology and deemed acceptable for use in Canada.September 2008ISO/IEC 13818-7:2006/Amd.1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file ma
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9、 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2007 All rights reservedISO/IEC 13818-7:2006/Amd.1:2007(E) ISO/IEC 2007 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commi
10、ssion) form the specialized system for worldwide standardization. National 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
11、 and IEC technical committees collaborate in fields of mutual interest. Other 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
12、/IEC JTC 1. International Standards are drafted in accordance with the rules 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 nationa
13、l bodies for voting. Publication as an International Standard requires approval 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
14、identifying any or all such patent rights. Amendment 1 to ISO/IEC 13818-7:2006 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. This corrected version incorporates a correction to the
15、 edition number on the cover page, replacing “First edition” with “Fourth edition”. ISO/IEC 13818-7:2006/Amd.1:2007(E) ISO/IEC 2007 All rights reserved 1Information technology Generic coding of moving pictures and associated audio information Part 7: Advanced Audio Coding (AAC) AMENDMENT 1: Transpor
16、t of MPEG Surround in AAC In the following, changes in existing text and tables are highlighted by grey background. In subclause 6.3 extend Table 28 “Syntax of extension_payload()” as follows: Table 28 Syntax of extension_payload() Syntax No. of bits Mnemonic extension_payload(cnt) extension_type; 4
17、 uimsbf switch( extension_type ) case EXT_DYNAMIC_RANGE: n = dynamic_range_info(); return n; case EXT_SAC_DATA: return sac_extension_data(cnt); case EXT_SBR_DATA: return sbr_extension_data(id_aac, 0); Note 1 case EXT_SBR_DATA_CRC: return sbr_extension_data(id_aac, 1); Note 1 In subclause 8.8.1.2 ext
18、end Table 40 “Values of the extension_type data element” as follows: Table 40 Values of the extension_type data element Symbol Value of extension_type Purpose EXT_FILL 0000 bitstream payload filler EXT_FILL_DATA 0001 bitstream payload data as filler EXT_DYNAMIC_RANGE 1011 dynamic range control EXT_S
19、AC_DATA 1100 MPEG Surround EXT_SBR_DATA 1101 SBR enhancement EXT_SBR_DATA_CRC 1110 SBR enhancement with CRC - all other values reserved ISO/IEC 13818-7:2006/Amd.1:2007(E) 2 ISO/IEC 2007 All rights reservedIn subclause 6.3 after Table 30 add a new Table “Syntax of sac_extension_data()” as given below
20、: Table 30A Syntax of sac_extension_data() Syntax No. of bits Mnemonic sac_extension_data(cnt) ancType; 2 uimsbf ancStart; 1 uimsbf ancStop; 1 uimsbf for (i=0; icnt-1; i+) ancDataSegmentBytei; 8 bslbf return (cnt); After subclause 8.8.4 add a new subclause 8.8.5 as given below: 8.8.5 MPEG Surround (
21、Spatial Audio Coding) The syntax element sac_extension_data() is used to embed spatial audio coding side information for MPEG Surround decoding as defined in ISO/IEC 23003-1. The semantics of the syntax elements ancType, ancStart, ancStop, and ancDataSegmentByte is defined in ISO/IEC 23003-1:2007, 7
22、.2.4. In subclause 9.3 (Decoding process), replace: “from the previously decoded coefficients” In the first paragraph on p. 75 with: “from the previously determined coefficients” Add the following reference to the bibliography: 4 ISO/IEC 23003-1, Information technology MPEG audio technologies Part 1
23、: MEPG Surround ISO/IEC 13818-7:2006/Amd.1:2007(E) ICS 35.040 ISO/IEC 2007 All rights reserved Copyright NoticeThis Amendment to the International Standard contains information copyright protected by the International Organization for Standardization (ISO) and the International Electrotechnical Comm
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