1、 ETSI TS 103 190 V1.1.1 (2014-04) Digital Audio Compression (AC-4) Standard floppy3Technical Specification ETSI ETSI TS 103 190 V1.1.1 (2014-04)2Reference DTS/JTC-025 Keywords audio, broadcasting, codec, content, digital, distribution ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRAN
2、CE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org The present document may be made available in el
3、ectronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing
4、 document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI docu
5、ments is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced or utilized in any form or by any m
6、eans, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. Eu
7、ropean Telecommunications Standards Institute 2014. European Broadcasting Union 2014. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members
8、and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 190 V1.1.1 (2014-04)3Contents Intellectual Property Rights 16g3Foreword . 16g3Introduction 16g31 Scope 18g32 References 18g32.1 Normative references . 18g32.2 I
9、nformative references 18g33 Definitions, symbols, abbreviations and conventions 19g33.1 Definitions 19g33.2 Symbols 21g33.3 Abbreviations . 21g33.4 Conventions 22g34 Bitstream syntax . 23g34.1 Semantics of syntax specification. 23g34.2 Syntax specification . 23g34.2.1 raw_ac4_frame - Raw AC-4 frame
10、. 23g34.2.2 variable_bits - Variable bits 23g34.2.3 AC-4 frame info 24g34.2.3.1 ac4_toc - AC-4 table of contents . 24g34.2.3.2 ac4_presentation_info - AC-4 presentation information . 25g34.2.3.3 presentation_version - Presentation version information 26g34.2.3.4 frame_rate_multiply_info - Frame rate
11、 multiplier information . 26g34.2.3.5 umd_info - Universal metadata information . 27g34.2.3.6 ac4_substream_info - AC-4 substream information 27g34.2.3.7 content_type - Content type 28g34.2.3.8 presentation_config_ext_info - Presentation configuration extended information . 28g34.2.3.9 ac4_hsf_ext_s
12、ubstream_info - AC-4 HSF extension substream information . 28g34.2.3.10 umd_payloads_substream_info - Universal metadata payloads substream information . 28g34.2.3.11 substream_index_table - Substream index table . 29g34.2.4 AC-4 substreams . 29g34.2.4.1 ac4_substream - AC-4 substream 29g34.2.4.2 ac
13、4_hsf_ext_substream - AC-4 high sampling frequency extension substream . 30g34.2.4.3 umd_payloads_substream - Universal metadata payloads substream . 31g34.2.5 audio_data - Audio data 31g34.2.6 Channel elements 32g34.2.6.1 single_channel_element - Single channel element 32g34.2.6.2 mono_data - Mono
14、data 32g34.2.6.3 channel_pair_element - Channel pair element 33g34.2.6.4 stereo_data - Stereo data . 34g34.2.6.5 3_0_channel_element - 3.0 channel element. 34g34.2.6.6 5_X_channel_element - 5.X channel element . 35g34.2.6.7 two_channel_data - Two channel data 36g34.2.6.8 three_channel_data - Three c
15、hannel data 36g34.2.6.9 four_channel_data - Four channel data . 36g34.2.6.10 five_channel_data - Five channel data 37g34.2.6.11 three_channel_info - Three channel info. 37g34.2.6.12 four_channel_info - Four channel info 37g34.2.6.13 five_channel_info - Five channel info. 37g34.2.6.14 7_X_channel_ele
16、ment - 7.X channel element . 38g34.2.7 Spectral frontend . 39g34.2.7.1 sf_info - Spectral frontend info . 39g34.2.7.2 sf_info_lfe - Spectral frontend info for LFE . 39g34.2.7.3 sf_data - Spectral frontend data . 39g3ETSI ETSI TS 103 190 V1.1.1 (2014-04)44.2.8 Audio spectral frontend 40g34.2.8.1 asf_
17、transform_info - ASF transform info 40g34.2.8.2 asf_psy_info - ASF scale factor band info 40g34.2.8.3 asf_section_data - ASF section data 41g34.2.8.4 asf_spectral_data - ASF spectral data . 42g34.2.8.5 asf_scalefac_data - ASF scale factor data . 42g34.2.8.6 asf_snf_data - ASF spectral noise fill dat
18、a 43g34.2.9 Speech spectral frontend . 43g34.2.9.1 ssf_data - Speech spectral frontend data . 43g34.2.9.2 ssf_granule - Speech spectral frontend granule . 44g34.2.9.3 ssf_st_data - Speech spectral frontend static data . 45g34.2.9.4 ssf_ac_data - Speech spectral frontend arithmetic coded data 45g34.2
19、.10 Stereo audio processing 46g34.2.10.1 chparam_info -Stereo information 46g34.2.10.2 sap_data - Stereo audio processing data 46g34.2.11 Companding control . 47g34.2.12 Advanced spectral extension - A-SPX 47g34.2.12.1 aspx_config - A-SPX configuration 47g34.2.12.2 aspx_data_1ch - A-SPX 1-channel da
20、ta 48g34.2.12.3 aspx_data_2ch - A-SPX 2-channel data 48g34.2.12.4 aspx_framing - A-SPX framing 49g34.2.12.5 aspx_delta_dir - A-SPX direction of envelope delta coding . 49g34.2.12.6 aspx_hfgen_iwc_1ch - A-SPX 1-channel HF generation and interleaved waveform coding . 50g34.2.12.7 aspx_hfgen_iwc_2ch -
21、A-SPX 2-channel HF generation and interleaved waveform coding . 51g34.2.12.8 aspx_ec_data - A-SPX entropy coded data . 52g34.2.12.9 aspx_huff_data - A-SPX Huffman data 52g34.2.13 Advanced coupling - A-CPL 52g34.2.13.1 acpl_config_1ch - A-CPL 1-channel configuration 52g34.2.13.2 acpl_config_2ch - A-C
22、PL 2-channel configuration 53g34.2.13.3 acpl_data_1ch - A-CPL 1-channel data . 53g34.2.13.4 acpl_data_2ch - A-CPL 2-channel data . 53g34.2.13.5 acpl_framing_data - A-CPL framing data . 53g34.2.13.6 acpl_ec_data - A-CPL entropy coded data 54g34.2.13.7 acpl_huff_data - A-CPL Huffman data . 54g34.2.14
23、Metadata . 54g34.2.14.1 metadata() - Metadata . 54g34.2.14.2 basic_metadata - Basic metadata . 55g34.2.14.3 further_loudness_info - Additional loudness information . 56g34.2.14.4 extended_metadata - Extended metadata 57g34.2.14.5 drc_frame - DRC frame 58g34.2.14.6 drc_config - DRC configuration . 58
24、g34.2.14.7 drc_decoder_mode_config - DRC decoder mode_config . 58g34.2.14.8 drc_compression_curve - Compression curve parameters 59g34.2.14.9 drc_data -DRC frame-based data 60g34.2.14.10 drc_gains - DRC gains 60g34.2.14.11 dialog_enhancement - Dialog enhancement metadata 61g34.2.14.12 de_config - Di
25、alog enhancement configuration 61g34.2.14.13 de_data - Dialog enhancement data 62g34.2.14.14 umd_payload_config - Universal metadata payload configuration . 63g34.2.14.15 umd_protection - Universal metadata protection data . 63g34.3 Description of bitstream elements 63g34.3.1 raw_ac4_frame - Raw AC-
26、4 frame . 64g34.3.1.1 fill_area - Fill area - variable number of bits . 64g34.3.1.2 fill_bits - Byte alignment bits - variable number of bits 64g34.3.1.3 byte_align - Byte alignment bits - 0 to 7 bits 64g34.3.2 variable_bits - Variable bits 64g34.3.2.1 read - Read bits - n_bits bits 64g34.3.2.2 b_re
27、ad_more - Read more flag - 1 bit . 64g34.3.3 AC-4 frame info 64g34.3.3.1 Purpose 64g34.3.3.2 ac4_toc - AC-4 table of contents . 64g34.3.3.2.1 bitstream_version - Bitstream version - 2 bits/variable_bits(2) . 64g3ETSI ETSI TS 103 190 V1.1.1 (2014-04)54.3.3.2.2 sequence_counter - Sequence counter - 10
28、 bits . 65g34.3.3.2.3 b_wait_frames - 1 bit . 65g34.3.3.2.4 wait_frames - 3 bits . 65g34.3.3.2.5 fs_index - Sampling frequency index - 1 bit 66g34.3.3.2.6 frame_rate_index - Frame rate - 4 bits 66g34.3.3.2.7 b_iframe_global - Global I-frame flag - 1 bit 66g34.3.3.2.8 b_single_presentation - Single p
29、resentation flag - 1 bit . 67g34.3.3.2.9 b_more_presentations - More presentations flag - 1 bit 67g34.3.3.2.10 b_payload_base - Payload base flag - 1 bit 67g34.3.3.2.11 payload_base_minus1 - Payload base offset minus 1 - 5 bits 67g34.3.3.2.12 byte_align - Byte alignment bits - 0 to 7 bits . 67g34.3.
30、3.3 ac4_presentation_info - AC-4 presentation information . 67g34.3.3.3.1 b_single_substream - Single substream flag - 1 bit . 67g34.3.3.3.2 b_belongs_to_presentation_group - Presentation group assignment flag - 1 bit . 67g34.3.3.3.3 b_hsf_ext - high sampling frequency extension flag - 1 bit . 67g34
31、.3.3.3.4 presentation_config - Presentation configuration - 3 bits/variable_bits(2) 67g34.3.3.3.5 b_pre_virtualized - Pre-virtualized flag - 1 bit 68g34.3.3.3.6 b_add_umd_substreams - Additional universal metadata substreams flag - 1 bit . 68g34.3.3.3.7 n_add_umd_substreams - Number of additional un
32、iversal metadata substreams - 2 bits/variable_bits(2) . 68g34.3.3.4 presentation_version - Presentation version information 68g34.3.3.4.1 b_tmp - Temporary flag - 1 bit 68g34.3.3.5 frame_rate_multiply_info - Frame rate multiplier information . 68g34.3.3.5.1 b_multiplier - Multiplier flag - 1 bit 68g
33、34.3.3.5.2 multiplier_bit - Multiplier bit - 1 bit 68g34.3.3.5.3 frame_rate_factor - Frame rate factor - via table . 68g34.3.3.6 umd_info - Universal metadata information . 68g34.3.3.6.1 umd_version - UMD syntax version - 2 bits/variable_bits(2) . 68g34.3.3.6.2 key_id - cryptographic key identificat
34、ion - 3 bits/variable_bits(3) 69g34.3.3.6.3 b_umd_payloads_substream_info - UMD payloads substream info flag - 1 bit 69g34.3.3.7 ac4_substream_info - AC-4 substream information 69g34.3.3.7.1 channel_mode - Channel mode - 1, 2, 4 or 7 bits/variable_bits(2) 69g34.3.3.7.2 b_sf_multiplier - Sampling fre
35、quency multiplier flag - 1 bit . 69g34.3.3.7.3 sf_multiplier - Sampling frequency multiplier bit - 1 bit . 69g34.3.3.7.4 b_bitrate_info - Bitrate presence flag - 1 bit 70g34.3.3.7.5 bitrate_indicator - Bitrate indicator - 3 bits or 5 bits . 70g34.3.3.7.6 add_ch_base - Additional channels coupling ba
36、se - 1 bit 70g34.3.3.7.7 b_content_type - Content type presence flag - 1 bit 70g34.3.3.7.8 b_iframe - I-frame flag - 1 bit 70g34.3.3.7.9 substream_index - Substream index - 2 bits/variable_bits(2) 70g34.3.3.8 content_type - Content type 71g34.3.3.8.1 content_classifier - Content classifier - 3 bits
37、71g34.3.3.8.2 b_language_indicator - Programme language indicator flag - 1 bit . 71g34.3.3.8.3 b_serialized_language_tag - Serialized language tag flag - 1 bit . 71g34.3.3.8.4 b_start_tag - Language tag start flag - 1 bit . 71g34.3.3.8.5 language_tag_chunk - Language tag chunk - 16 bits. 71g34.3.3.8
38、.6 n_language_tag_bytes - Number of language tag bytes - 6 bits 71g34.3.3.8.7 language_tag_bytes - Language tag bytes - 8 bits . 72g34.3.3.9 presentation_config_ext_info - Presentation configuration extended information . 72g34.3.3.9.1 n_skip_bytes - Number of bytes to skip - 5 bits 72g34.3.3.9.2 b_
39、more_skip_bytes - More bytes to skip flag - 1 bit . 72g34.3.3.9.3 reserved - Reserved - 8 bits . 72g34.3.3.10 ac4_hsf_ext_substream_info - AC-4 HSF extension substream information . 72g34.3.3.10.1 substream_index - Substream index - 2 bits/variable_bits(2) 72g34.3.3.11 umd_payloads_substream_info -
40、Universal metadata payloads substream information . 72g34.3.3.11.1 substream_index - Substream index - 2 bits/variable_bits(2) 72g34.3.3.12 substream_index_table - Substream index table . 72g34.3.3.12.1 n_substreams - Number of substreams - 2 bits/variable_bits(2) 72g34.3.3.12.2 b_size_present - Siz
41、e present flag - 1 bit . 72g34.3.3.12.3 b_more_bits - More bits flag - 1 bit . 72g34.3.3.12.4 substream_size - Substream size - 10 bits . 73g34.3.4 ac4_substream - AC-4 substream . 73g3ETSI ETSI TS 103 190 V1.1.1 (2014-04)64.3.4.1 audio_size_value - Audio size value - 15 bits . 73g34.3.4.2 b_more_bi
42、ts - More bits flag - 1 bit 73g34.3.4.3 byte_align - Byte alignment bits - 0 to 7 bits 73g34.3.5 Channel elements 73g34.3.5.1 mono_codec_mode - Mono codec mode - 1 bit 73g34.3.5.2 spec_frontend - Spectral frontend selection - 1 bit 74g34.3.5.3 stereo_codec_mode - Stereo codec mode - 2 bits . 74g34.3
43、.5.4 3_0_codec_mode - 3.0 codec mode - 1 bit 74g34.3.5.5 3_0_coding_config - 3.0 coding configuration - 1 bit . 74g34.3.5.6 5_X_codec_mode - 5.X codec mode - 3 bits 74g34.3.5.7 7_X_codec_mode - 7.X codec mode - 2 bits 75g34.3.5.8 coding_config - Coding configuration - 1 or 2 bits . 75g34.3.5.9 2ch_m
44、ode - Channel coupling mode - 2 bits . 75g34.3.5.10 b_enable_mdct_stereo_proc - Enable MDCT stereo processing flag - 1 bit . 75g34.3.5.11 chel_matsel - Matrix selection code - 4 bits 75g34.3.5.12 b_use_sap_add_ch - Use SAP for additional channels flag - 1 bit 75g34.3.5.13 max_sfb_master - max_sfb in
45、dication for related channels - n_side_bits bits 75g34.3.6 Audio spectral frontend 76g34.3.6.1 asf_transform_info - ASF transform info 76g34.3.6.1.1 b_long_frame - Long frame flag - 1 bit . 76g34.3.6.1.2 transf_lengthi - Transform length index i - 2 bits . 76g34.3.6.1.3 transf_length - Transform len
46、gth - 2 bits . 77g34.3.6.2 asf_psy_info - ASF psy info . 77g34.3.6.2.1 n_msfb_bits - Number of maxsfb bits - via table 77g34.3.6.2.2 max_sfbi - Number of transmitted scale factor bands for index i - n_msfb_bits bits . 79g34.3.6.2.3 max_sfb_sidei - Number of transmitted scale factor bands for side ch
47、annel and index i - 3 to 7 bits 79g34.3.6.2.4 n_grp_bits - Number of grouping bits - via table 79g34.3.6.2.5 scale_factor_grouping_bit - Scale factor grouping bit - 1 bit 79g34.3.6.2.6 asf_psy_info helper elements 80g34.3.6.3 asf_section_data - ASF section data 81g34.3.6.3.1 sect_cbgi - Section code
48、book - 4 bits . 81g34.3.6.3.2 sect_len_incr - Section length increment - 3 or 5 bits . 81g34.3.6.4 asf_spectral_data - ASF spectral data . 81g34.3.6.4.1 asf_qspec_hcw - Huffman coded quantized spectral lines - variable bits . 81g34.3.6.4.2 huff_decode(hcb, hcw) - Huffman decoding . 81g34.3.6.4.3 qua
49、d_sign_bits - Quad sign bits - 0 to 4 bits 81g34.3.6.4.4 pair_sign_bits - Pair sign bits -0 to 2 bits 81g34.3.6.4.5 ext_code - Extension code - 5 to 21 bits 81g34.3.6.5 asf_scalefac_data - ASF scale factor data . 81g34.3.6.5.1 reference_scale_factor - Reference scale factor - 8 bit 81g34.3.6.5.2 asf_sf_hcw - Huffman coded scale factor delta - variable bits 81g34.3.6.6 asf_snf_data - ASF spectral noise fill data 81g34.3.6.6.1 b_snf_data_exists - Spectral noise fill data exists flag - 1 bit 81g34.3.6.6.2 asf_snf_hcw - Huffman code spectral noise fill delta - variable
