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1、 Reference number ISO/IEC 14496-4:2004/Amd.18:2007(E) ISO/IEC 2007 INTERNATIONAL STANDARD ISO/IEC 14496-4 Second edition 2004-12-15 AMENDMENT 18 2007-12-01 Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 18: Conformance of MPEG-1/2 Audio in MPEG-4 Technolo
2、gies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 18: Conformit de MPEG-1/2 Audio dans MPEG-4 -,-,- ISO/IEC 14496-4:2004/Amd.18:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be
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5、e is suitable for use by ISO 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 re
6、produced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 2
7、2 749 01 11 Fax + 41 22 749 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.18:2007(E) ISO/IEC 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) and IEC (the Interna
8、tional Electrotechnical Commission) 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 fiel
9、ds of technical activity. ISO 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 j
10、oint 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 the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical commit
11、tee 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. 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
12、 not be held responsible for identifying any or all such patent rights. Amendment 18 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
13、-4:2004/Amd.18:2007(E) ISO/IEC 2007 All rights reserved 1 Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 18: Conformance of MPEG-1/2 Audio in MPEG-4 In subclause 6.5.1 File name conventions, insert the following row into Table 29 after the row for DST: La
14、yer-3 l3_ l3_ In subclause 6.6, add the following subclause: 6.6.21 Layer-3 6.6.21.1 Compressed data 6.6.21.1.1 Characteristics Conformant Layer-3 compressed MPEG-4 data shall have the Layer-3 data stored as specified in ISO/IEC 14496-3, subpart 9. 6.6.21.1.2 Test procedure Each compressed data shal
15、l meet the syntactic and semantic requirements specified in ISO/IEC 14496-3. The decoded data shall also meet the requirements defined in ISO/IEC 11172-3 and ISO/IEC 13818-3. If a syntactic element is not listed below, no restrictions apply to that element. The reserved element shall be encoded with
16、 the value zero. 6.6.21.1.2.1 AudioSpecificConfig audioObjectType: Shall be encoded with the value 34. 6.6.21.1.2.2 Bitstream payload syncword: shall be set to the total length of the mp3_channel_element (consisting of header, error_check, side_info and main data) in bytes main_data_begin (9/8 bit):
17、 shall be set to the correct value for the corresponding MPEG-1/2 Layer 3 bitstream, or to zero main_data(): shall be stored immediately following the side information -,-,- ISO/IEC 14496-4:2004/Amd.18:2007(E) 2 ISO/IEC 2007 All rights reserved 6.6.21.2 Decoders 6.6.21.2.1 Characteristics The MPEG-4
18、 Layer-3 object type (“mp3on4”) is the counterpart to the MPEG-1/2 Layer-3, though also offering multi-channel support and support for lower sampling rates. The compressed MPEG-4 data syntax is defined in ISO/IEC 14496-3. The Audio Object Type Layer-3 contains re-formatted ISO/IEC 11172-3 or ISO/IEC
19、 13818-3 Layer 3 compressed data. 6.6.21.2.2 Test procedure The test procedures specified in ISO/IEC 11172-4 and ISO/IEC 13818-4 shall be applied. If no test is specified, a check of conformance using appropriate measurements, e.g. the LSB criterion or objective perceptual measurement systems, is no
20、t mandatory but highly recommended. 6.6.21.2.3 Test sequences To test MPEG-4 Layer-3 decoders, ISO/IEC JTC 1/SC 29/WG 11 supplies a number of test sequences. The test sequences are defined in Table AMD18.1. -,-,- ISO/IEC 14496-4:2004/Amd.18:2007(E) ISO/IEC 2007 All rights reserved 3 Table AMD18.1 MP
21、EG-1/2 Audio on MPEG-4 Layer-3 test sequences file base name Mnemonic origin content IDex ID bitrate_index sampling_rate mode JS CRC test procedure l3-test10101 he_32khz 11172-4 sine 1 1 0001 10 11 none x none l3-test10102 he_44khz 11172-4 sine 1 1 0001 00 11 none x none l3-test10103 he_48khz 11172-
22、4 sine 1 1 0001 01 11 none x none l3-test10104 si 11172-4 noise 1 1 0101 00 11 none x none l3-test10105 si_block 11172-4 noise 1 1 0101 00 11 none x none l3-test10106 si_huff_patched derived from si_huff (11172-4) noise 1 1 0101 00 11 none x none l3-test10107 mp3on4_1 new music 1 1 0101 01 11 none n
23、one none l3-test10201 he_mode 11172-4 sine 1 1 1001 00 all MS, IS x none l3-test10202 hecommon 11172-4 sine 1 1 1001 00 00 none none l3-test10203 intens new noise 1 1 1001 00 01 IS x none l3-test10204 sin1k0db 11172-4 sine 1 1 1001 00 01 none x none l3-test10205 worstcas new artificial 1 1 1110 00 0
24、1 none x none l3-test10206 compl 11172-4 sweep (10 Hz 10 kHz, -20 dB) 1 1 0101 01 11 none x RMS l3-test10207 mp3on4_2 new music 1 1 1001 01 01 MS none none l3-test10501 mp3on4_5 new music 1 1 1110 01 11,01,01 MS none none l3-test20140 bitrate_16_all 13818-4 tonal, sine 1 0 0001 10 11 none x none l3-
25、test20141 bitrate_22_all 13818-4 tonal, sine 1 0 0001 00 11 none x none l3-test20142 bitrate_24_all 13818-4 tonal, sine 1 0 0001 01 11 none x none l3-test20143 compl24 13818-4 sweep (10 Hz 10 kHz, -20 dB) 1 0 1100 01 11 none x RMS l3-test20244 noise 13818-4 white noise 1 0 1010 00 01 none x none l3-
26、test20245 is2 13818-4 white noise 1 0 1110 00 01 IS x none l3-test20246 ms2 13818-4 white noise 1 0 1110 00 01 MS, IS x none l3-test20247 Test_20_00 new sweep 1 0 1010 00 01 IS x none l3-test20248 Test_20_80 new sweep 1 0 1010 00 01 IS x none l3-test25101 compl12 new sweep (10 Hz 5 kHz, -20 dB) 0 0
27、1000 01 11 none x RMS l3-test25102 bitrate_8_all new sine 0 0 0000 10 11 none x none l3-test25103 bitrate_11_all new sine 0 0 0000 00 11 none x none l3-test25104 bitrate_12_all new sine 0 0 0000 01 11 none x none l3-test25201 noise new noise 0 0 1000 00 01 none x none l3-test25202 test20_00 new swee
28、p (10 Hz 5 kHz) 0 0 1000 00 01 none x none l3-test25203 test20_80 new sweep (10 Hz 5 kHz) 0 0 1000 00 01 none x none l3-test25204 bitrates_8i new noise 0 0 1000 10 01 IS x none l3-test25205 bitrates_11i new noise 0 0 1000 00 01 MS, IS x none l3-test25206 bitrates_12i new noise 0 0 1000 01 01 MS, IS
29、x none l3-test25207 sw_8i new sweep (550 Hz 5 kHz) 0 0 0100 10 01 IS x none l3-test25208 sw_11i new sweep (550 Hz 5 kHz) 0 0 0100 00 01 IS x none l3-test25209 sw_12i new sweep (550 Hz 5 kHz) 0 0 0100 01 01 IS x none Add test sequences provided in the electronic attachment into the subdirectories compressedMp4, referencesWav and informative, respectively. -,-,- ISO/IEC 14496-4:2004/Amd.18:2007(E) ICS 35.040 Price based on 3 pages ISO/IEC 2007 All rights reserved -,-,-