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1、 Reference number ISO/IEC 14496-4:2004/Amd.19:2007(E) ISO/IEC 2007 INTERNATIONAL STANDARD ISO/IEC 14496-4 Second edition 2004-12-15 AMENDMENT 19 2007-12-01 Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 19: Audio lossless coding (ALS) Technologies de linf
2、ormation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 19: Codage audio sans perte (ALS) ISO/IEC 14496-4:2004/Amd.19:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall
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5、 member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any
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7、09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2007 All rights reserved -,-,- ISO/IEC 14496-4:2004/Amd.19:2007(E) ISO/IEC 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Comm
8、ission) 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. IS
9、O 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, IS
10、O/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 nation
11、al 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
12、 identifying any or all such patent rights. Amendment 19 to ISO/IEC 14496-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 14496-4:2004/Amd.19:2007(E) ISO/IEC 2007 All
13、rights reserved 1 Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 19: Audio lossless coding (ALS) In subclause 6.5.1 File name conventions, add the following row at the end of Table 29: Table 29 File name conventions ALS als_ als_ At the end of subclause 6
14、.6 Audio Object Types, add the following subclauses: 6.6.22 ALS (Audio lossless coding) 6.6.22.1 Compressed data 6.6.22.1.1 Characteristics Conformant ALS compressed MPEG-4 data shall have the ALS data stored as outlined in ISO/IEC 14496-3. 6.6.22.1.2 Test procedure Each compressed data shall meet t
15、he syntactic and semantic requirements specified in ISO/IEC 14496-3. The decoded data shall also meet the requirements defined in ISO/IEC 14496-3. If a syntactic element is not listed below, no restrictions apply to that element. The reserved element shall be encoded with the value zero. 6.6.22.1.2.
16、1 Compressed MPEG-4 data payload 6.6.22.1.2.1.1 AudioSpecificConfig audioObjectType: Shall be encoded with the value 36. samplingFrequencyIndex: Shall be encoded with the value 0xf. SamplingFrequency: Shall be encoded with the value samp_freq if samp_freq 3)-1), 1 as defined in ISO/IEC 14496-3. 6.6.
17、22.2 Decoders 6.6.22.2.1 Characteristics The object type ALS has the Object Type ID 36, and the compressed MPEG-4 data syntax is defined in ISO/IEC 14496-3. The Audio Object Type ALS contains the ALS tools. 6.6.22.2.2 ALS conformance test procedure Compressed data and reference decoder output signal
18、s are provided to apply the conformance criterion using the procedure described in the following subclause. The conformance of the ALS decoder can be checked with compressed data for the ALS object type. For lossless compressed data the conformance criterion is bit exact reproduction of the referenc
19、e decoder output, this means that all bits in the output of the test decoder are identical to the corresponding bits in the output of the reference decoder. To be called a conforming ALS decoder, the required conformance criterion must be met for all compressed data listed in subclause 6.6.22.2.3. -
20、,-,- ISO/IEC 14496-4:2004/Amd.19:2007(E) ISO/IEC 2007 All rights reserved 3 6.6.22.2.3 Proposed test sequences Table AMD19-1 ALS test sequences file base name content Number of Channels sampling frequency (kHz) word length (bit) adaptive order random access block switching LTP joint stereo MCC BGMC
21、RLSLMS Conformance criteria als_00 music 2 48, 96,192 16, 20, 24 y y Bit exact als_01 music 2 48, 96,192 16, 20, 24 y y y Bit exact als_02 music 2 48, 96,192 16, 20, 24 y Bit exact als_03 music 2 48, 96,192 16, 20, 24 y Bit exact als_04 music 2 48, 96,192 16, 20, 24 y Bit exact als_05 music 2 48, 96
22、,192 16, 20, 24 y Bit exact als_06 music 2 48, 96,192 16, 20, 24 y Bit exact als_07 music 2 192 32 float y Bit exact als_08 music 6 96 24 y y y y y y y Bit exact als_09 bio data 512 2 16 y y y y y y Bit exact 6.6.22.3 Encoders In order to guarantee for an encoder implementation that the decoded outp
23、ut results in an exact replica of the input signal, the following procedure should be followed: - Generate bitstreams using the target encoder for the conformance test item reference waveform data; - Decode these bitstreams using the conformant reference software decoder; - Verify that the decoded outputs are identical to the inputs. -,-,- ISO/IEC 14496-4:2004/Amd.19:2007(E) ICS 35.040 Price based on 3 pages ISO/IEC 2007 All rights reserved -,-,-