1、Information technology High efficiency coding and media delivery in heterogeneous environments Part 3: 3D audio AMENDMENT 2: MPEG-H 3D Audio File Format Support Technologies de linformation Codage haute efficacit et livraison des medias dans des environnements htrognes Partie 3: Audio 3D AMENDEMENT
2、2: Support de format fichier audio 3D MPEG-H INTERNATIONAL STANDARD ISO/IEC 23008-3 First edition 2015-10-15 Reference number ISO/IEC 23008-3:2015/Amd.2:2016(E) AMENDMENT 2 2016-09-01 ISO/IEC 2016 ii ISO/IEC 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2016, Published in Switzerland
3、 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requeste
4、d from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC 23008-3:2015/Amd.2:2016(E) Foreword ISO (th
5、e 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 development of International Standards through technical committees e
6、stablished 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-governmental, in liaison with ISO and IEC, also take part in the work. In
7、 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 the joint technical committee is to prepare International Standard
8、s. 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. Attention is drawn to the possibility that some of the elements o
9、f 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 2 to ISO/IEC 23008-3:2015 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, pict
10、ure, multimedia and hypermedia information. ISO/IEC 23008-3:2015/Amd.2:2016(E) ISO/IEC 2016 All rights reserved iii Information technology High efficiency coding and media delivery in heterogeneous environments Part 3: 3D audio AMENDMENT 2: MPEG-H 3D Audio File Format Support Page 346 Add the follow
11、ing as a new Clause 20 20 Carriage of MPEG-H 3D Audio in ISO base media file format 20.1 General This clause specifies the carriage of MPEG-H 3D Audio in the ISO base media file format. 20.2 describes the signalling of random access points for Immediate Play-out Frames (IPF) and independently decoda
12、ble frames (IF). 20.7 describes the additional signalling of dynamic range control and loudness information that might be present in the encoded bitstream. 20.9 describes the additional signalling of audio scene information data that might be present in the encoded bitstream. 20.2 Random Access and
13、Stream Access Frames that use AudioPreRoll() following the restrictions in 5.5.6 are considered to be Immediate Play- out Frames (IPF) and shall be signalled by means of the sync sample box according to ISO/IEC 14496- 12:2015, 8.6.2. Independently decodable Frames (IF) as described in 5.7 shall be s
14、ignalled by means of the roll sample group according to ISO/IEC 14496-12. 20.3 Overview of new box structures mha1, mha2, mhm1, mhm2 * sample entry mhaC configuration mhaD dynamic range and loudness maeM multi-stream maeI audio scene information maeG * group definition maeS switch group definition m
15、aeP preset definition maeL text label definition ISO/IEC 23008-3:2015/Amd.2:2016(E) ISO 2016 All rights reserved 1 unsigned int(8) configurationVersion = 1; unsigned int(8) mpegh3daProfileLevelIndication; unsigned int(8) referenceChannelLayout; unsigned int(16) mpegh3daConfigLength; bit(8*mpegh3daCo
16、nfigLength) mpegh3daConfig; 20.4.3 Semantics configurationVersion shall be set to 1 in this version of the specification. mpegh3daProfileLevelIndication defined in 5.2.2. referenceChannelLayout ChannelConfiguration value defined in ISO/IEC 23001-8. mpegh3daConfigLength length in bytes of mpegh3daCon
17、fig. mpegh3daConfig the MPEGH-H 3DA configuration defined in this part of ISO/IEC 23008. 20.5 MPEG-H Audio Sample Entry 20.5.1 Definition Box Types: mhaC, mha1, mha2 Container: Sample Table Box (stbl) Mandatory: The mha1 box is mandatory Quantity: One or more sample entries may be present The MHASam
18、pleEntry shall contain a MHAConfigurationBox , as defined below. This includes the MHADecoderConfigurationRecord as defined in 20.4. If the sample entry type is mha1, multiple streams shall not be used. If the sample entry name is mha2, multiple streams may be used. If an mha1 or mha2 MHASampleEntry
19、 is present, each sample of the appropriate Track shall contain exactly one mpegh3daFrame as defined in this part of ISO/IEC 23008. An optional MPEG4BitRateBox may be present in the MHASampleEntry to signal the bit rate information of the MHA stream. Extension descriptors that should be inserted int
20、o the Elementary Stream Descriptor, when used in MPEG-4, may also be present. Other boxes may be present in the MHASampleEntry. When multiple streams are used, the MHADecoderConfigurationRecord for each track shall correspond to the appropriate mpegh3daFrame of that track. The following optional box
21、es inherited from AudioSampleEntry from ISO/IEC 14496-12/Amd 4:2015 shall not be present DownMixInstructions() DRCCoefficientsBasic() DRCInstructionsBasic() ISO/IEC 23008-3:2015/Amd.2:2016(E)20.4 MHA decoder configuration record 20.4.1 Definition This clause specifies the decoder configuration infor
22、mation for MPEG-H 3D Audio (MHA) content. This record contains a version field. This version of the specification defines version 1 of this record. Incompatible changes to the record will be indicated by a change of version number. Readers must not attempt to decode this record or the streams to whi
23、ch it applies if the version number is unrecognised. 20.4.2 Syntax aligned(8) class MHADecoderConfigurationRecord 2 ISO 2016 All rights reserved DRCCoefficientsUniDRC() DRCInstructionsUniDRC() 20.5.2 Syntax class MHAConfigurationBox() extends Box(mhaC) MHADecoderConfigurationRecord MHAConfig; class
24、MPEG4BitRateBox() extends Box(btrt) unsigned int(32) bufferSizeDB; unsigned int(32) maxBitrate; unsigned int(32) avgBitrate; class MPEG4ExtensionDescriptorsBox() extends Box(m4ds) Descriptor Descr0 255; MHASampleEntry() extends AudioSampleEntry(mha1) MHAConfigurationBox config; MPEG4BitRateBox(); /
25、optional MPEG4ExtensionDescriptorsBox (); / optional MHASampleEntry() extends AudioSampleEntry(mha2) MHAConfigurationBox config; MPEG4BitRateBox(); / optional MPEG4ExtensionDescriptorsBox (); / optional 20.5.3 Semantics ChannelCount inherited from AudioSampleEntry, shall be set to 0 (inapplicable) T
26、he MPEG-H 3D Audio decoder is capable of rendering a scene to any given speaker setup. The referenceChannelLayout carried in the MHADecoder- ConfigurationRecord shall be used to signal the preferred reproduction layout for this stream and replaces the ChannelCount config defined in 20.4 Descr is a d
27、escriptor which should be placed in in the ElementaryStreamDescrip- tor when this stream is used in an MPEG-4 systems context. This does not include SLConfigDescriptor or DecoderConfigDescriptor , but includes the other descriptors in order to be placed after the SLConfigDescriptor bufferSizeDB give
28、s the size of the decoding buffer for the elementary stream in bytes maxBitrate gives the maximum rate in bits/second over any window of 1 second minBitrate gives the average rate in bits/second over any window of 1 second 20.6 MPEG-H Audio MHAS Sample Entry 20.6.1 Definition Box Types: mhm1, mhm2 C
29、ontainer: Sample Table Box (stbl) Mandatory: No Quantity: One or more sample entries may be present Especially in streaming or broadcast environments based on, e.g. MPEG-DASH or MPEG-H MMT, the MPEG-H 3D Audio configuration may change at arbitrary positions of the stream and not necessarily only on
30、fragment boundaries. To enable this use-case the mhm1 and mhm2 MHASampleEntry provides an in-band configuration mechanism for MPEG-H 3D Audio files. ISO/IEC 23008-3:2015/Amd.2:2016(E) ISO 2016 All rights reserved 3 MHAConfigurationBox config; / optional MPEG4BitRateBox(); / optional MPEG4ExtensionDe
31、scriptorsBox(); / optional MHASampleEntry() extends AudioSampleEntry(mhm2) MHAConfigurationBox config; / optional MPEG4BitRateBox(); / optional MPEG4ExtensionDescriptorsBox(); / optional 20.7 Dynamic Range Control and Loudness 20.7.1 MHA Dynamic Range Control and Loudness 20.7.1.1 Definition Box Typ
32、e: mhaD Container: MHA sample entry (mha1, mha2, mhm1, mhm2) Mandatory: No Quantity: Zero or one This box specifies the dynamic range control and loudness information that may be contained in the MPEG-H 3D Audio (MHA) track. The provided information represents only a subset of the in-stream configur
33、ation according to 6.3. ISO/IEC 23008-3:2015/Amd.2:2016(E)If an mhm1 or mhm2 MHASampleEntry is present, each sample of the appropriate Track shall contain exactly one MHAS Packet with the MHASPacketType PACTYP_MPEGH3DAFRAME as defined in Clause 14. A sample may contain additional MHAS Packets of oth
34、er types: if present, an MHAS Packet with MHASPacketType PACTYP_MPEGH3DACFG, PACTYP_AUDIOSCENEINFO or PACTYP_ AUDIOTRUNCATION shall directly precede the MHAS Packet of Type PACTYP_MPEGH3DAFRAME. MHAS Packets with the MHASPacketType PACTYPE_CRC16 and PACTYPE_CRC32 shall not be present in any sample.
35、Other MHAS Packets may be present in a sample. The first sample of the movie and the first sample of every fragment (when applicable) shall contain a MHAS packet with the type PACTYP_MPEGH3DACFG followed by an MHAS packet with the Type PACTYP_AUDIOSCENEINFO if present. All samples of the movie that
36、contain an MHAS packet of type PACTYP_MPEGH3DACFG shall be sync samples. If the movie contains a configuration change, i.e. one of the samples of the movie besides the first sample contains an MHAS packet of type PACTYP_MPEGH3DACFG, all sync samples of the movie shall contain an MHAS packet of type
37、PACTYP_MPEGH3DACFG. If the sample entry type is mhm1, multiple streams shall not be used. If the sample entry name is mhm2, multiple streams may be used. Optional boxes may be present in the MHASampleEntry. Optional boxes for the sample entry type mhm1 are handled according to the sample entry type
38、is mha1, optional boxes for the sample entry type is mhm2 are handled according to the sample entry type is mha2. In contrast to the sample entry types mha1 and mha2 the MHAConfigurationBox is optional for the sample entry types mhm1 and mhm2 and not mandatory. 20.6.2 Syntax MHASampleEntry() extends
39、 AudioSampleEntry(mhm1) 4 ISO 2016 All rights reserved 20.7.1.2 Syntax aligned(8) class MHADynamicRangeControlAndLoudnessBox() extends FullBox(mhaD, version = 0, 0) unsigned int(2) reserved = 0; unsigned int(6) drcInstructionsUniDrcCount; unsigned int(2) reserved = 0; unsigned int(6) loudnessInfoCou
40、nt; unsigned int(2) reserved = 0; unsigned int(6) loudnessInfoAlbumCount; unsigned int(3) reserved = 0; unsigned int(5) downmixIdCount; for (i=0; i drcInstructionsUniDrcCount; i+) unsigned int(6) reserved = 0; unsigned int(2) drcInstructionsType; if (drcInstructionsType = 2) unsigned int(1) reserved
41、 = 0; unsigned int(7) mae_groupID; if (drcInstructionsType = 3) unsigned int(3) reserved = 0; unsigned int(5) mae_groupPresetID; unsigned int(2) reserved = 0; unsigned int(6) drcSetId; unsigned int(1) reserved = 0; unsigned int(7) downmixId; unsigned int(5) reserved = 0; unsigned int(3) additionalDo
42、wnmixIdCount; for (j=0; j additionalDownmixIdCount; j+) unsigned int(1) reserved = 0; unsigned int(7) additionalDownmixId; unsigned int(16) drcSetEffect; unsigned int(7) reserved = 0; unsigned int(1) limiterPeakTargetPresent; if (limiterPeakTargetPresent = 1) unsigned int(8) bsLimiterPeakTarget; uns
43、igned int(7) reserved = 0; unsigned int(1) drcSetTargetLoudnessPresent; if (drcSetTargetLoudnessPresent = 1) unsigned int(2) reserved = 0; unsigned int(6) bsDrcSetTargetLoudnessValueUpper; unsigned int(2) reserved = 0; unsigned int(6) bsDrcSetTargetLoudnessValueLower; unsigned int(1) reserved = 0; u
44、nsigned int(6) dependsOnDrcSet; if (dependsOnDrcSet = 0) unsigned int(1) noIndependentUse; else unsigned int(1) reserved = 0; for (i=0; i loudnessInfoCount; i+) unsigned int(6) reserved = 0; unsigned int(2) loudnessInfoType; if (loudnessInfoType = 1 | loudnessInfoType = 2) unsigned int(1) reserved =
45、 0; unsigned int(7) mae_groupID; else if (loudnessInfoType = 3) unsigned int(3) reserved = 0; unsigned int(5) mae_groupPresetID; LoudnessBaseBox(); for (i=0; i loudnessInfoAlbumCount; i+) ISO/IEC 23008-3:2015/Amd.2:2016(E) ISO 2016 All rights reserved 5 LoudnessBaseBox(); for (i=0; i downmixIdCount;
46、 i+) unsigned int(1) reserved = 0; unsigned int(7) downmixId; unsigned int(2) downmixType; unsigned int(6) CICPspeakerLayoutIdx; 20.7.1.3 Semantics drcInstructionsUniDrcCount number of drcInstructions in the MHA track loudnessInfoCount number of loudnessInfo blocks in the MHA track loudnessInfoAlbum
47、Count number of loudnessInfoAlbum blocks in the MHA track downmixIdCount number of downmixId definitions in the MHA track drcInstructionsType defined in 6.3 a value of 1 is not defined mae_groupID defined in 15.3 mae_groupPresetID defined in 15.3 drcSetId defined in ISO/IEC 23003-4:2015, Annex A dow
48、nmixId defined in 5.3.5 additionalDownmixId defined in ISO/IEC 23003-4:2015, Annex A drcSetEffect defined in ISO/IEC 23003-4:2015, Annex A bsLimiterPeakTarget defined in ISO/IEC 23003-4:2015, Annex A bsDrcSetTargetLoudnessValueUpper defined in ISO/IEC 23003-4:2015, Annex A bsDrcSetTargetLoudnessValueLower defined in ISO/IEC 23003-4:2015, Annex A dependsOnDrcSet defined in ISO/IEC 23003-4:2015, Annex A noIndependentUse defined in ISO/IEC 23003-4:2015, Annex A downmixType defined in 5.3.5 CICPspeakerLayoutIdx defined in 5.3.5 LoudnessBox() defined in ISO/IEC 14496-12:2012/Amd.4:2015 20
