1、 ETSI TS 103 190-1 V1.3.1 (2018-02) Digital Audio Compression (AC-4) Standard; Part 1: Channel based coding floppy3TECHNICAL SPECIFICATION ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)2 Reference RTS/JTC-043-1 Keywords audio, broadcasting, codec, content, digital, distribution ETSI 650 Route des Lucioles
2、F-06921 Sophia Antipolis Cedex - FRANCE 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/standards-s
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7、ng restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizat
8、ional Partners. oneM2M logo is protected for the benefit of its Members. GSM and the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)3 Contents Intellectual Property Rights 17g3Foreword . 17g3Modal verbs terminology 17g3Introduction 18g31 S
9、cope 20g32 References 20g32.1 Normative references . 20g32.2 Informative references 20g33 Definitions, symbols, abbreviations and conventions 21g33.1 Definitions 21g33.2 Symbols 23g33.3 Abbreviations . 24g33.4 Conventions 25g34 Bitstream syntax . 26g34.1 Semantics of syntax specification. 26g34.2 Sy
10、ntax specification . 26g34.2.1 raw_ac4_frame - Raw AC-4 frame . 26g34.2.2 variable_bits - Variable bits 26g34.2.3 AC-4 frame information . 27g34.2.3.1 ac4_toc - AC-4 table of contents . 27g34.2.3.2 ac4_presentation_info - AC-4 presentation information . 27g34.2.3.3 presentation_version - Presentatio
11、n version information 29g34.2.3.4 frame_rate_multiply_info - Frame rate multiplier information . 29g34.2.3.5 emdf_info - EMDF information 29g34.2.3.6 ac4_substream_info - AC-4 substream information 30g34.2.3.7 content_type - Content type 30g34.2.3.8 presentation_config_ext_info - Presentation config
12、uration extended information . 30g34.2.3.9 ac4_hsf_ext_substream_info - AC-4 HSF extension substream information . 31g34.2.3.10 emdf_payloads_substream_info - EMDF payloads substream information 31g34.2.3.11 substream_index_table - Substream index table . 31g34.2.4 AC-4 substreams . 32g34.2.4.1 AC-4
13、 substreams . 32g34.2.4.2 ac4_substream - AC-4 substream 32g34.2.4.3 ac4_hsf_ext_substream - AC-4 high sampling frequency extension substream . 32g34.2.4.4 emdf_payloads_substream - EMDF payloads substream 33g34.2.5 audio_data - Audio data 33g34.2.6 Channel elements 33g34.2.6.1 single_channel_elemen
14、t - Single channel element 33g34.2.6.2 mono_data - Mono data 34g34.2.6.3 channel_pair_element - Channel pair element 34g34.2.6.4 stereo_data - Stereo data . 35g34.2.6.5 3_0_channel_element - 3.0 channel element. 35g34.2.6.6 5_X_channel_element - 5.X channel element . 36g34.2.6.7 two_channel_data - T
15、wo channel data 37g34.2.6.8 three_channel_data - Three channel data 37g34.2.6.9 four_channel_data - Four channel data . 38g34.2.6.10 five_channel_data - Five channel data 38g34.2.6.11 three_channel_info - Three channel info. 38g34.2.6.12 four_channel_info - Four channel info 38g34.2.6.13 five_channe
16、l_info - Five channel info. 39g34.2.6.14 7_X_channel_element - 7.X channel element . 39g34.2.7 Spectral frontend . 40g34.2.7.1 sf_info - Spectral frontend info . 40g34.2.7.2 sf_info_lfe - Spectral frontend info for LFE . 40g3ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)4 4.2.7.3 sf_data - Spectral fronten
17、d data . 41g34.2.7.4 sf_hsf_data - Spectral frontend HSF extension data . 41g34.2.8 Audio spectral frontend 41g34.2.8.1 asf_transform_info - ASF transform info 41g34.2.8.2 asf_psy_info - ASF scale factor band info 41g34.2.8.3 asf_section_data - ASF section data 42g34.2.8.4 asf_spectral_data - ASF sp
18、ectral data . 43g34.2.8.5 asf_scalefac_data - ASF scale factor data . 44g34.2.8.6 asf_snf_data - ASF spectral noise fill data 44g34.2.8.7 asf_hsf_spectral_data - ASF spectral data for HSF extension 44g34.2.8.8 asf_hsf_scalefac_data - ASF scale factor data for HSF extension 45g34.2.8.9 asf_hsf_snf_da
19、ta - ASF spectral noise fill data for HSF extension . 45g34.2.9 Speech spectral frontend . 46g34.2.9.1 ssf_data - Speech spectral frontend data . 46g34.2.9.2 ssf_granule - Speech spectral frontend granule . 46g34.2.9.3 ssf_st_data - Speech spectral frontend static data . 47g34.2.9.4 ssf_ac_data - Sp
20、eech spectral frontend arithmetic coded data 47g34.2.10 Stereo audio processing 48g34.2.10.1 chparam_info -Stereo information 48g34.2.10.2 sap_data - Stereo audio processing data 48g34.2.11 Companding control . 49g34.2.12 Advanced spectral extension - A-SPX 49g34.2.12.1 aspx_config - A-SPX configura
21、tion 49g34.2.12.2 aspx_data_1ch - A-SPX 1-channel data 49g34.2.12.3 aspx_data_2ch - A-SPX 2-channel data 50g34.2.12.4 aspx_framing - A-SPX framing 50g34.2.12.5 aspx_delta_dir - A-SPX direction of envelope delta coding . 51g34.2.12.6 aspx_hfgen_iwc_1ch - A-SPX 1-channel HF generation and interleaved
22、waveform coding . 52g34.2.12.7 aspx_hfgen_iwc_2ch - A-SPX 2-channel HF generation and interleaved waveform coding . 52g34.2.12.8 aspx_ec_data - A-SPX entropy coded data . 53g34.2.12.9 aspx_huff_data - A-SPX Huffman data 54g34.2.13 Advanced coupling - A-CPL 54g34.2.13.1 acpl_config_1ch - A-CPL 1-chan
23、nel configuration 54g34.2.13.2 acpl_config_2ch - A-CPL 2-channel configuration 54g34.2.13.3 acpl_data_1ch - A-CPL 1-channel data . 55g34.2.13.4 acpl_data_2ch - A-CPL 2-channel data . 55g34.2.13.5 acpl_framing_data - A-CPL framing data . 55g34.2.13.6 acpl_ec_data - A-CPL entropy coded data 56g34.2.13
24、.7 acpl_huff_data - A-CPL Huffman data . 56g34.2.14 Metadata . 56g34.2.14.1 metadata() - Metadata . 56g34.2.14.2 basic_metadata - Basic metadata . 57g34.2.14.3 further_loudness_info - Additional loudness information . 58g34.2.14.4 extended_metadata - Extended metadata 59g34.2.14.5 drc_frame - DRC fr
25、ame 60g34.2.14.6 drc_config - DRC configuration . 60g34.2.14.7 drc_decoder_mode_config - DRC decoder mode configuration . 60g34.2.14.8 drc_compression_curve - Compression curve parameters 61g34.2.14.9 drc_data -DRC frame-based data 61g34.2.14.10 drc_gains - DRC gains 62g34.2.14.11 dialog_enhancement
26、 - Dialog enhancement metadata 62g34.2.14.12 de_config - Dialog enhancement configuration 62g34.2.14.13 de_data - Dialog enhancement data 63g34.2.14.14 emdf_payload_config - EMDF payload configuration . 64g34.2.14.15 emdf_protection - EMDF protection data . 64g34.3 Description of bitstream elements
27、64g34.3.0 Introduction. 64g34.3.1 raw_ac4_frame - raw AC-4 frame 65g34.3.1.1 fill_area - fill area 65g34.3.1.2 fill_bits - byte alignment bits 65g34.3.1.3 byte_align - byte alignment bits 65g34.3.2 variable_bits - Variable bits 65g3ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)5 4.3.2.0 Encoding . 65g34.3.
28、2.1 read - read bits . 65g34.3.2.2 b_read_more - read more flag . 65g34.3.3 AC-4 frame information . 66g34.3.3.1 Purpose 66g34.3.3.2 ac4_toc - AC-4 table of contents . 66g34.3.3.2.1 bitstream_version - bitstream version 66g34.3.3.2.2 sequence_counter - sequence counter 66g34.3.3.2.3 b_wait_frames .
29、66g34.3.3.2.4 wait_frames . 66g34.3.3.2.5 fs_index - Sampling frequency index 67g34.3.3.2.6 frame_rate_index - frame rate . 67g34.3.3.2.7 b_iframe_global - global I-frame flag . 68g34.3.3.2.8 b_single_presentation - single presentation flag 68g34.3.3.2.9 b_more_presentations - more presentations fla
30、g . 68g34.3.3.2.10 b_payload_base - payload base flag 68g34.3.3.2.11 payload_base_minus1 - payload base offset minus 1 69g34.3.3.2.12 byte_align - byte alignment bits 69g34.3.3.3 ac4_presentation_info - AC-4 presentation information . 69g34.3.3.3.1 b_single_substream - single substream flag 69g34.3.
31、3.3.2 b_belongs_to_presentation_id - Presentation identifier assignment flag. 69g34.3.3.3.3 b_hsf_ext - high sampling frequency extension flag . 69g34.3.3.3.4 presentation_config - presentation configuration - 69g34.3.3.3.5 b_pre_virtualized - pre-virtualized flag . 69g34.3.3.3.6 b_add_emdf_substrea
32、ms - additional EMDF substreams flag 69g34.3.3.3.7 n_add_emdf_substreams - number of additional EMDF substreams 69g34.3.3.3.8 mdcompat - compatibility indication . 70g34.3.3.4 presentation_version - presentation version information 70g34.3.3.4.1 b_tmp - temporary flag 70g34.3.3.5 frame_rate_multiply
33、_info - frame rate multiplier information 70g34.3.3.5.1 b_multiplier - multiplier flag . 70g34.3.3.5.2 multiplier_bit - multiplier bit . 70g34.3.3.5.3 frame_rate_factor - frame rate factor . 70g34.3.3.6 emdf_info - EMDF information 71g34.3.3.6.1 emdf_version - EMDF syntax version . 71g34.3.3.6.2 key
34、_id - authentication ID . 71g34.3.3.6.3 b_emdf_payloads_substream_info - EMDF payloads substream information flag . 71g34.3.3.7 ac4_substream_info - AC-4 substream information 71g34.3.3.7.1 channel_mode - channel mode 71g34.3.3.7.2 b_sf_multiplier - sampling frequency multiplier flag 71g34.3.3.7.3 s
35、f_multiplier - sampling frequency multiplier bit 72g34.3.3.7.4 b_bitrate_info - bit-rate presence flag 72g34.3.3.7.5 bitrate_indicator - bit-rate indicator . 72g34.3.3.7.6 add_ch_base - additional channels coupling base . 72g34.3.3.7.7 b_content_type - content type presence flag 72g34.3.3.7.8 b_ifra
36、me - I-frame flag 72g34.3.3.7.9 substream_index - substream index . 72g34.3.3.8 content_type - content type . 73g34.3.3.8.1 content_classifier - content classifier . 73g34.3.3.8.2 b_language_indicator - programme language indicator flag . 73g34.3.3.8.3 b_serialized_language_tag - serialized language
37、 tag flag 73g34.3.3.8.4 b_start_tag - language tag start flag . 73g34.3.3.8.5 language_tag_chunk - language tag chunk 73g34.3.3.8.6 n_language_tag_bytes - number of language tag bytes . 74g34.3.3.8.7 language_tag_bytes - language tag bytes. 74g34.3.3.9 presentation_config_ext_info - presentation con
38、figuration extended information 74g34.3.3.9.1 n_skip_bytes - number of bytes to skip . 74g34.3.3.9.2 b_more_skip_bytes - more bytes to skip flag 74g34.3.3.9.3 reserved - Reserved . 74g34.3.3.10 ac4_hsf_ext_substream_info - AC-4 HSF extension substream information . 74g34.3.3.10.1 substream_index - s
39、ubstream index . 74g34.3.3.11 emdf_payloads_substream_info - EMDF payloads substream information 74g3ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)6 4.3.3.11.1 substream_index - substream index . 74g34.3.3.12 substream_index_table - substream index table 74g34.3.3.12.1 n_substreams - number of substreams .
40、 74g34.3.3.12.2 b_size_present - size present flag 74g34.3.3.12.3 b_more_bits - more bits flag 75g34.3.3.12.4 substream_size - substream size 75g34.3.4 ac4_substream - AC-4 substream . 75g34.3.4.1 audio_size_value - audio size value 75g34.3.4.2 b_more_bits - more bits flag . 75g34.3.4.3 byte_align -
41、 byte alignment bits 75g34.3.5 Channel elements 75g34.3.5.0 Introduction . 75g34.3.5.1 mono_codec_mode - mono codec mode . 75g34.3.5.2 spec_frontend - spectral frontend selection . 76g34.3.5.3 stereo_codec_mode - stereo codec mode 76g34.3.5.4 3_0_codec_mode - 3.0 codec mode 76g34.3.5.5 3_0_coding_co
42、nfig - 3.0 coding configuration . 76g34.3.5.6 5_X_codec_mode - 5.X codec mode 76g34.3.5.7 7_X_codec_mode - 7.X codec mode 77g34.3.5.8 coding_config - coding configuration . 77g34.3.5.9 2ch_mode - channel coupling mode 77g34.3.5.10 b_enable_mdct_stereo_proc - enable MDCT stereo processing flag 77g34.
43、3.5.11 chel_matsel - matrix selection code 77g34.3.5.12 b_use_sap_add_ch - use SAP for additional channels flag . 77g34.3.5.13 max_sfb_master - max_sfb indication for related channels 77g34.3.6 audio spectral front end . 77g34.3.6.1 asf_transform_info - ASF transform information . 77g34.3.6.1.1 b_lo
44、ng_frame - long frame flag . 77g34.3.6.1.2 transf_lengthi - transform length index i . 78g34.3.6.1.3 transf_length - transform length 78g34.3.6.1.4 get_transf_length(g) get transform length for group g . 79g34.3.6.2 asf_psy_info - ASF psy information . 80g34.3.6.2.1 n_msfb_bits - number of maxsfb bi
45、ts 80g34.3.6.2.2 max_sfbi - number of transmitted scale factor bands for index i 81g34.3.6.2.3 max_sfb_sidei - number of transmitted scale factor bands for side channel and index i 81g34.3.6.2.4 n_grp_bits - number of grouping bits 81g34.3.6.2.5 scale_factor_grouping_bit - scale factor grouping bit
46、. 82g34.3.6.2.6 asf_psy_info helper elements 82g34.3.6.2.7 get_max_sfb(g) get max_sfb for group g . 83g34.3.6.3 asf_section_data - ASF section data 83g34.3.6.3.1 sect_cbgi - section codebook 83g34.3.6.3.2 sect_len_incr - section length increment . 84g34.3.6.4 asf_spectral_data - ASF spectral data .
47、84g34.3.6.4.1 asf_qspec_hcw - Huffman coded quantized spectral lines 84g34.3.6.4.2 huff_decode(hcb, hcw) - Huffman decoding . 84g34.3.6.4.3 quad_sign_bits - quad sign bits . 84g34.3.6.4.4 pair_sign_bits - pair sign bits . 84g34.3.6.4.5 ext_code - extension code 84g34.3.6.5 asf_scalefac_data - ASF sc
48、ale factor data . 84g34.3.6.5.1 reference_scale_factor - reference scale factor 84g34.3.6.5.2 asf_sf_hcw - Huffman coded scale factor delta . 84g34.3.6.6 asf_snf_data - ASF spectral noise fill data 84g34.3.6.6.1 b_snf_data_exists - spectral noise fill data exists flag . 84g34.3.6.6.2 asf_snf_hcw - H
49、uffman code spectral noise fill delta 85g34.3.7 Speech spectral frontend . 85g34.3.7.1 ssf_data - Speech spectral frontend data . 85g34.3.7.1.1 b_ssf_iframe - SSF I-frame flag 85g34.3.7.2 ssf_granule - speech spectral frontend granule . 85g34.3.7.2.1 stride_flag - stride flag . 85g34.3.7.2.2 SSF configuration 85g34.3.7.2.3 num_bands_minus12 - number of SSF coded bands minus 12 . 86g34.3.7.2.4 predictor_presence_flagb - predictor presence flag for block b 86g3ETSI ETSI TS 103 190-1 V1.3.1 (2018-02)7 4.3.7.2.5 delta_flagb - delta coding flag for block b 86g34.3.7
