1、 Reference numberISO/IEC 14496-4:2004/Amd.15:2007(E)ISO/IEC 2007Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 15: Lossless coding of oversampled audio Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 15:
2、 Codage sans perte dacoustique surchantillonneAmendment 15:2008 toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-4:06Amendment 15:2007 to International Standard ISO/IEC 14496-4:2004 has been adopted withoutmodification (IDT) as Amendment 15:2008 to CSA Standard CAN/CSA-ISO/IEC 14496-4:06. ThisAmen
3、dment was reviewed by the CSA Technical Committee on Information Technology (TCIT) under thejurisdiction of the Strategic Steering Committee on Information Technology and deemed acceptable for use inCanada.September 2008 International Organization for Standardization (ISO), 2007. All rights reserved
4、. International Electrotechnical Commission (IEC), 2007. All rights reserved. NOT FOR RESALE. ISO/IEC 14496-4:2004/Amd.15:2007(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 not be edited unless
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9、htiso.org Web www.iso.org ii ISO/IEC 2007 All rights reservedAmendment 15:2008 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.15:2007(E) ISO/IEC 2007 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
10、 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 and I
11、EC 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/IEC J
12、TC 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 national bodi
13、es 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 identi
14、fying any or all such patent rights. Amendment 15 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. Amendment 15:2008 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-
15、4:2004/Amd.15:2007(E) ISO/IEC 2007 All rights reserved 1Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 15: Lossless coding of oversampled audio In subclause 6.5.1 File name conventions, insert the following row into Table 29 after the row for SSC: Table 2
16、9 File name conventions DST dst_sig dst_sig_ After subclause 6.6.19 SSC, add the following subclauses: 6.6.20 DST (Lossless coding of oversampled audio) 6.6.20.1 Compressed data 6.6.20.1.1 Characteristics Conformant DST compressed MPEG-4 data shall have the DST data stored as outlined in ISO/IEC 144
17、96-3:2005. 6.6.20.1.2 Test procedure Each compressed data shall meet the 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.
18、The reserved element shall be encoded with the value zero. 6.6.20.1.2.1 Compressed MPEG-4 data payload 6.6.20.1.2.1.1 AudioSpecificConfig audioObjectType: Shall be encoded with the value 35. samplingFrequencyIndex: Shall be encoded with the value 0xf. SamplingFrequency: Shall be encoded with the val
19、ue 64*44100 or 128*44100 or 256*44100. channelConfiguration: Shall be encoded with the value 0. 6.6.20.1.2.1.2 DSTSpecificConfig N_Channels: Shall not be encoded with the value 0. Amendment 15:2008 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.15:2007(E) 2 ISO/IEC 2007 All rights reserved6.6.
20、20.1.2.1.3 DST DST_X_Bit: Shall be encoded with the value 0. 6.6.20.1.2.1.4 Channel_Segmentation Nr_Of_Segments: Shall not exceed the value of 4 for the Filter_Segmentation and the Filter_And_Ptable_Segmentation, and shall not exceed the value of 8 for the Ptable_Segmentation. Resolution: Shall be e
21、ncoded with a value in the range of 1 Frame_length-MINSEGLEN, with MINSEGLEN as defined in ISO/IEC 14496-3:2005/Amd.6, 10.6.1.3.2.5.2.2.2. Scaled_LengthNr_Of_Segments: Shall be encoded with a value in the range of 1 Range, with Range as defined in ISO/IEC 14496-3:2005/Amd.6, 10.6.1.3.2.5.2.2.3. 6.6.
22、20.1.2.1.5 Filter_Coef_Sets CC_Method: Shall not be encoded with the value 11. CCM: Shall not be encoded with the value 7. 6.6.20.1.2.1.6 Probability_Tables PC_Method: Shall not be encoded with the value 11. PCM: Shall be encoded with a value in the range of 0 4. 6.6.20.2 Decoders 6.6.20.2.1 Charact
23、eristics The object type DST has the Object Type ID 35, and the compressed MPEG-4 data syntax is defined in ISO/IEC 14496-3. The Audio Object Type DST contains the DST tool. 6.6.20.2.2 DST conformance test procedure Test compressed data and reference decoder output signals are provided to apply the
24、conformance criterion using the procedure described in the following sub clause. The conformance of the DST decoder tool can be checked with compressed data for the DST object type. For lossless compressed data the conformance criterion is bit exact reproduction of the reference decoder output, this
25、 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 DST decoder, the required conformance criterion must be met for all test compressed data listed in subclause 6.6.20.2.3. Amendment 15:2008
26、toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.15:2007(E) ISO/IEC 2007 All rights reserved 36.6.20.2.3 Proposed test sequences Table AMD15.1 DST test sequences filebasenamecontent NumberofChannels 64 *44100 128*44100 256*44100 Plain DSDframesSegmentation TestMapping Test Filter_Coef_SetsTest P
27、robability_TablesTest Arithmetic_Coded_Data Test Conformance criteria dst_00 test signal 1, 2, 3, 4, 5, 6,8, 16, 32, 64 y y y - - - - - - Bit exact dst_01 test signal 2, 5, 6 y y y y - - - - - Bit exact dst_02 test signal 2, 5, 6 y y y - y - - - - Bit exact dst_03 test signal 2, 5, 6 y - - - y - - -
28、 Bit exact dst_04 test signal 2, 5, 6 y - - - - y - - Bit exact dst_05 test signal 2, 5, 6 y - - - - - y - Bit exact dst_06 test signal 2, 5, 6 y - - - - - - y Bit exact 6.6.20.3 Encoders In order to guarantee that for an encoder implementation that the decoded output results in an exact replica of
29、the input signal, the following procedure should be followed: - Generate bitstreams using the target encoder for the conformance test item reference data - Decode these bitstreams using the conformant reference SW decoder; - Verify that the decoded outputs are identical to the inputs. Amendment 15:2
30、008 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.15:2007(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 Elec
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32、ission from the Standards Council of Canada (SCC). Requests for permission to reproduce this Amendment to the International Standard or parts thereof should be addressed to Manager, Technical Document Centre Standards Council of Canada 270 Albert Street, Suite 200 Ottawa, Ontario K1P 6N7 The Canadia
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