1、Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 20: Scalable to lossless coding (SLS) conformanceAmendment 20:2009 (IDT) toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-4-06(ISO/IEC 14496-4:2004, IDT)NOT FOR RESALE.PUBLICATION NON DESTINE LA REVENTE.CSA
2、 Standards Update ServiceAmendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06October 2009Title: Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 20: Scalable to lossless coding (SLS) conformancePagination: 7 pages (iii preliminary and 4 text)To register for e-mai
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4、ll 416-747-2233.Visit CSAs policy on privacy at www.csagroup.org/legal to find out how we protect your personal information.Reference numberISO/IEC 14496-4:2004/Amd.20:2008(E)ISO/IEC 2008INTERNATIONAL STANDARD ISO/IEC14496-4Second edition2004-12-15AMENDMENT 202008-08-15Information technology Coding
5、of audio-visual objects Part 4: Conformance testing AMENDMENT 20: Scalable to lossless coding (SLS) conformance Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 20: Conformit de codage extensible sans perte (SLS) ISO/IEC 14496-4:2004/Amd.20:2008(E)
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10、ow or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2008 All rights reservedAmendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Am
11、d.20:2008(E) ISO/IEC 2008 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the deve
12、lopment 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. Other international organizations, governmental and non-governme
13、ntal, 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 rules given in the ISO/IEC Directives, Part 2. The main task of t
14、he 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 approval by at least 75 % of the national bodies casting a vote.
15、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. Amendment 20 to ISO/IEC 14496-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1,
16、 Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. This Amendment adds the conformance testing for the SLS audio object types defined in 14496-3. Amendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.20:2008(E) ISO/IEC 2008
17、All rights reserved 1Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 20: Scalable to lossless coding (SLS) conformance In 6.5.1, File name conventions, add the following row at the end of Table 29: Table 29 File name conventions SLS _ _ In 6.5.1, File name
18、 conventions, add the following text: can be 16 or 24 and indicates the bit resolution of the coded wavefile At the end of 6.6, Audio Object Types, add the following subclauses: 6.6.23 SLS (Scalable Lossless Coding) 6.6.23.1 Compressed data 6.6.23.1.1 Characteristics Conformant SLS compressed MPEG-4
19、 data shall have the SLS data stored as outlined in ISO/IEC 14496-3. 6.6.23.1.2 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
20、 not listed below, no restrictions apply to that element. The reserved element shall be encoded with the value zero. 6.6.23.1.2.1 Compressed MPEG-4 data payload 6.6.23.1.2.1.1 AudioSpecificConfig audioObjectType: Shall be encoded with the value 37 (core mode) or 38 (non-core mode). 6.6.23.1.2.1.2 SL
21、SSpecificConfig pcmWordLength: Shall be encoded with a value in the range 0 3, as defined in ISO/IEC 14496-3. Other values are reserved. aac_core_present: either 0 or 1 for AOT 37, 0 for AOT 38. Amendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.20:2008(E) 2 ISO/IEC 2008 All righ
22、ts reservedframeLength: Shall be encoded with a value in the range 0 3, as defined in ISO/IEC 14496-3. Other values are reserved. 6.6.23.1.2.1.3 lle_header() band_type_signaling: Shall be encoded with a value in the range 0 2, as defined in ISO/IEC 14496-3. The value of 3 is reserved. 6.6.23.2 Decod
23、ers 6.6.23.2.1 Characteristics The object type SLS has either the Object Type ID 37 (core mode) or 38 (non-core mode), and the compressed MPEG-4 data syntax is defined in ISO/IEC 14496-3. The Audio Object Type SLS contains the SLS tools. 6.6.23.2.2 Test procedure Compressed data and reference decode
24、r output signals are provided to apply the conformance criterion using the procedure described in the following subclause. Note that, for the bitstreams providing lossless reconstruction, the original input signals provide the reference for the decoder output signal. The conformance of the SLS decod
25、er can be checked with compressed data for the SLS object type. For lossless compressed data, the conformance criterion is bit exact reproduction of the reference 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 r
26、eference decoder. To be called a conforming AAC-LC+SLS decoder, the required conformance criterion will be met for all compressed data with core coder AOT2 listed in subclause 6.6.23.2.3. To be called a conforming BSAC+SLS decoder, the required conformance criterion will be met for all compressed da
27、ta with core coder AOT22 listed in subclause 6.6.23.2.3. To be called a conforming non-core SLS decoder, the required conformance criterion will be met for all compressed data with no core coder listed in subclause 6.6.23.2.3. Amendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.20
28、:2008(E) ISO/IEC 2008 All rights reserved 36.6.23.2.3 Proposed test sequences Table AMD20.1 SLS test sequences file base name content number of channels sampling frequency (kHz)/ word length (bit) max. truncation bitrate (kbit/s/ch) core coder BPGC CBAC conformance criterion sls2100 mixed 2 48 / 16,
29、 48 / 24 96 / 24, 192 / 24 none (lossless) AOT 2 (64 kbit/s) X bit exact sls2101 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 none (lossless) AOT 2 (64 kbit/s) X bit exact sls2110 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 256 AOT 2 (64 kbit/s) X bit exact sls2111 mixed 2 48 / 16, 48 / 24 96 / 24, 192
30、 / 24 256 AOT 2 (64 kbit/s) X bit exact sls2200 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 none (lossless) AOT 22 (64 kbit/s) X bit exact sls2201 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 none (lossless) AOT 22 (64 kbit/s) X bit exact sls2210 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 256 AOT 22 (6
31、4 kbit/s) X bit exact sls2211 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 256 AOT 22 (64 kbit/s) X bit exact sls2300 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 none (lossless) no core X bit exact sls2301 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 none (lossless) no core X bit exact sls2310 mixed 2 48
32、 / 16, 48 / 24 96 / 24, 192 / 24 256 no core X bit exact sls2311 mixed 2 48 / 16, 48 / 24 96 / 24, 192 / 24 256 no core X bit exact sls6100 mixed 6 48 / 24 96 / 24, none (lossless) AOT 2 (64 kbit/s) X bit exact sls6101 mixed 6 48 / 24 96 / 24, none (lossless) AOT 2 (64 kbit/s) X bit exact sls6110 mi
33、xed 6 48 / 24 96 / 24, 256 AOT 2 (64 kbit/s) X bit exact sls6111 mixed 6 48 / 24 96 / 24, 256 AOT 2 (64 kbit/s) X bit exact sls6200 mixed 6 48 / 24 96 / 24, none (lossless) AOT 22 (64 kbit/s) X bit exact sls6201 mixed 6 48 / 24 96 / 24, none (lossless) AOT 22 (64 kbit/s) X bit exact sls6210 mixed 6
34、48 / 24 96 / 24, 256 AOT 22 (64 kbit/s) X bit exact sls6211 mixed 6 48 / 24 96 / 24, 256 AOT 22 (64 kbit/s) X bit exact sls6300 mixed 6 48 / 24 96 / 24, none (lossless) no core X bit exact sls6301 mixed 6 48 / 24 96 / 24, none (lossless) no core X bit exact sls_6310 mixed 6 48 / 24 96 / 24, 256 no c
35、ore X bit exact sls_6311 mixed 6 48 / 24 96 / 24, 256 no core X bit exact Amendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.20:2008(E) 4 ISO/IEC 2008 All rights reserved6.6.23.3 Encoders In order to guarantee, for an encoder implementation, that the decoded output results in an
36、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 identi
37、cal to the inputs. Add test sequences provided in the electronic attachment into the subdirectories compressedMp4 and referencesWav. Amendment 20:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.20:2008(E) ICS 35.040 ISO/IEC 2008 All rights reserved Copyright NoticeThis Amendment to the Int
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