hash stringlengths 32 32 | doc_id stringlengths 7 13 | section stringlengths 3 121 | content stringlengths 0 2.2M |
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79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.1 raw_ac4_frame - Raw AC-4 frame | Table 2: Syntax of raw_ac4_frame() Syntax No. of bits raw_ac4_frame() { ac4_toc(); fill_area; .............................................................................. VAR byte_align .............................................................................. 0…7 for (i = 0; i < n_substreams; i++) { ac4_substrea... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.2 variable_bits - Variable bits | Table 3: Syntax of variable_bits() Syntax No. of bits variable_bits(n_bits) { value = 0; do { value += read; .................................................................. n_bits if (b_read_more) { ................................................................... 1 value <<= n_bits; value += (1<<n_bits); } } whil... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3 AC-4 frame information | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.1 ac4_toc - AC-4 table of contents | Table 4: Syntax of ac4_toc() Syntax No. of bits ac4_toc() { bitstream_version; ....................................................................... 2 if (bitstream_version == 3) { bitstream_version += variable_bits(2); } sequence_counter; ....................................................................... 10 if ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.2 ac4_presentation_info - AC-4 presentation information | Table 5: Syntax of ac4_presentation_info() Syntax No. of bits ac4_presentation_info() { if (b_single_substream != 1) { ............................................................ 1 presentation_config .................................................................. 3 if (presentation_config == 7) { presentation_conf... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.3 presentation_version - Presentation version information | Table 6: Syntax of presentation_version() Syntax No. of bits presentation_version() { val = 0; while (b_tmp == 1) { ...................................................................... 1 val++; } return val; } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.4 frame_rate_multiply_info - Frame rate multiplier information | Table 7: Syntax of frame_rate_multiply_info() Syntax No. of bits frame_rate_multiply_info(frame_rate_index) { switch (frame_rate_index) { case 2: case 3: case 4: if (b_multiplier) { .................................................................. 1 multiplier_bit; ........................................................ |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.5 emdf_info - EMDF information | Table 8: Syntax of emdf_info() Syntax No. of bits emdf_info() { emdf_version; ............................................................................. 2 if ( emdf_version == 3) { emdf_version += variable_bits(2); } key_id; .................................................................................. 3 if (key... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.6 ac4_substream_info - AC-4 substream information | Table 9: Syntax of ac4_substream_info() Syntax No. of bits ac4_substream_info() { channel_mode; ...................................................................... 1/2/4/7 if (channel_mode == 0b1111111) { channel_mode += variable_bits(2); } if (fs_index == 1) { /* 48 kHz */ if (b_sf_multiplier) { ...................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.7 content_type - Content type | Table 10: Syntax of content_type() Syntax No. of bits content_type() { content_classifier; ...................................................................... 3 if (b_language_indicator) { ............................................................... 1 if (b_serialized_language_tag) { ................................ |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.9 ac4_hsf_ext_substream_info - AC-4 HSF extension substream information | Table 12: Syntax of ac4_hsf_ext_substream_info() Syntax No. of bits ac4_hsf_ext_substream_info() { if (substream_index == 3) { ............................................................... 2 substream_index += variable_bits(2); } } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.10 emdf_payloads_substream_info - EMDF payloads substream information | Table 13: Syntax of emdf_payloads_substream_info() Syntax No. of bits emdf_payloads_substream_info() { if (substream_index == 3) { ............................................................... 2 substream_index += variable_bits(2); } } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07) 33 |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.3.11 substream_index_table - Substream index table | Table 14: Syntax of substream_index_table() Syntax No. of bits substream_index_table() { if (n_substreams == 0) { .................................................................. 2 n_substreams = variable_bits(2) + 4; } if (n_substreams == 1) { b_size_present; ............................................................ |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.4 AC-4 substreams | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.4.1 AC-4 substreams | The ac4_substream_data() element for a specific substream index depends on the type of info element which refers to this specific substream. The mapping for the info elements defined in the present document is given in table 15. Table 15: ac4_substream_data mapping info element type referencing the substream ac4_substr... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.4.2 ac4_substream - AC-4 substream | Table 16: Syntax of ac4_substream() Syntax No. of bits ac4_substream() { audio_size = audio_size_value; .......................................................... 15 if (b_more_bits) { ........................................................................ 1 audio_size += variable_bits(7) << 15; } byte_align ............ |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.4.4 emdf_payloads_substream - EMDF payloads substream | Table 18: Syntax of emdf_payloads_substream() Syntax No. of bits emdf_payloads_substream() { while (emdf_payload_id != 0) { ............................................................ 5 if ( emdf_payload_id == 31) { emdf_payload_id += variable_bits(5); } emdf_payload_config(); emdf_payload_size = variable_bits(8); for... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.5 audio_data - Audio data | Table 19: Syntax of audio_data() Syntax No. of bits audio_data(channel_mode, b_iframe) { switch (channel_mode) { case mono: single_channel_element(b_iframe); break; case stereo: channel_pair_element(b_iframe); break; case 3.0: 3_0_channel_element(b_iframe); break; case 5.0: 5_X_channel_element(0, b_iframe); break; case... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6 Channel elements | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.1 single_channel_element - Single channel element | Table 20: Syntax of single_channel_element() Syntax No. of bits single_channel_element(b_iframe) { mono_codec_mode; ......................................................................... 1 if (b_iframe) { if (mono_codec_mode == ASPX) { aspx_config(); } } if (mono_codec_mode == SIMPLE) { mono_data(0); } else { compan... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.2 mono_data - Mono data | Table 21: Syntax of mono_data() Syntax No. of bits mono_data(b_lfe) { if (b_lfe) { spec_frontend = ASF; sf_info_lfe(); } else { spec_frontend; ...................................................................... 1 sf_info(spec_frontend, 0, 0); } sf_data(spec_frontend); } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07) 36 |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.3 channel_pair_element - Channel pair element | Table 22: Syntax of channel_pair_element() Syntax No. of bits channel_pair_element(b_iframe) { stereo_codec_mode; ....................................................................... 2 if (b_iframe) { if (stereo_codec_mode == ASPX) { aspx_config(); } if (stereo_codec_mode == ASPX_ACPL_1) { aspx_config(); acpl_config... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.4 stereo_data - Stereo data | Table 23: Syntax of stereo_data() Syntax No. of bits stereo_data() { if (b_enable_mdct_stereo_proc) { .......................................................... 1 spec_frontend_l = ASF; spec_frontend_r = ASF; sf_info(ASF, 0, 0); chparam_info(); } else { spec_frontend_l; .................................................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.5 3_0_channel_element - 3.0 channel element | Table 24: Syntax of 3_0_channel_element() Syntax No. of bits 3_0_channel_element(b_iframe) { 3_0_codec_mode; .......................................................................... 1 if (3_0_codec_mode == ASPX) { if (b_iframe) { aspx_config(); } companding_control(3); } switch (3_0_coding_config) { .................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.6 5_X_channel_element - 5.X channel element | Table 25: Syntax of 5_X_channel_element() Syntax No. of bits 5_X_channel_element(b_has_lfe, b_iframe) { 5_X_codec_mode; .......................................................................... 3 if (b_iframe) { if (5_X_codec_mode == ASPX || 5_X_codec_mode == ASPX_ACPL_1 || 5_X_codec_mode == ASPX_ACPL_2 || 5_X_codec_m... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.7 two_channel_data - Two channel data | Table 26: Syntax of two_channel_data() Syntax No. of bits two_channel_data() { if (b_enable_mdct_stereo_proc) { .......................................................... 1 sf_info(ASF, 0, 0); chparam_info(); } else { sf_info(ASF, 0, 0); sf_info(ASF, 0, 0); } sf_data(ASF); sf_data(ASF); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.8 three_channel_data - Three channel data | Table 27: Syntax of three_channel_data() Syntax No. of bits three_channel_data() { sf_info(ASF, 0, 0); three_channel_info(); sf_data(ASF); sf_data(ASF); sf_data(ASF); } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07) 40 |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.9 four_channel_data - Four channel data | Table 28: Syntax of four_channel_data() Syntax No. of bits four_channel_data() { sf_info(ASF, 0, 0); four_channel_info(); sf_data(ASF); sf_data(ASF); sf_data(ASF); sf_data(ASF); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.10 five_channel_data - Five channel data | Table 29: Syntax of five_channel_data() Syntax No. of bits five_channel_data() { sf_info(ASF, 0, 0); five_channel_info(); sf_data(ASF); sf_data(ASF); sf_data(ASF); sf_data(ASF); sf_data(ASF); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.11 three_channel_info - Three channel info | Table 30: Syntax of three_channel_info() Syntax No. of bits three_channel_info() { chel_matsel; ............................................................................. 4 chparam_info(); chparam_info(); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.12 four_channel_info - Four channel info | Table 31: Syntax of four_channel_info() Syntax No. of bits four_channel_info() { chparam_info(); chparam_info(); chparam_info(); chparam_info(); } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07) 41 |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.13 five_channel_info - Five channel info | Table 32: Syntax of five_channel_info() Syntax No. of bits five_channel_info() { chel_matsel; ............................................................................. 4 chparam_info(); chparam_info(); chparam_info(); chparam_info(); chparam_info(); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.6.14 7_X_channel_element - 7.X channel element | Table 33: Syntax of 7_X_channel_element() Syntax No. of bits 7_X_channel_element(channel_mode, b_iframe) { 7_X_codec_mode; .......................................................................... 2 if (b_iframe) { if (7_X_codec_mode != SIMPLE) { aspx_config(); } if (7_X_codec_mode == ASPX_ACPL_1) { acpl_config_1ch(PA... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.7 Spectral frontend | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.7.1 sf_info - Spectral frontend info | Table 34: Syntax of sf_info() Syntax No. of bits sf_info(spec_frontend, b_dual_maxsfb, b_side_limited) { if (spec_frontend == ASF) { asf_transform_info(); asf_psy_info(b_dual_maxsfb, b_side_limited); } } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.7.2 sf_info_lfe - Spectral frontend info for LFE | Table 35: Syntax of sf_info_lfe() Syntax No. of bits sf_info_lfe() { b_long_frame = 1; /* transform length = frame_length */ max_sfb[0]; .................................................................... n_msfbl_bits num_window_groups = 1; } NOTE: n_msfbl_bits is defined in clause 4.3.6.2.1. ETSI ETSI TS 103 190-1 V1... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.7.3 sf_data - Spectral frontend data | Table 36: Syntax of sf_data() Syntax No. of bits sf_data(spec_frontend) { if (spec_frontend == ASF) { asf_section_data(); asf_spectral_data(); asf_scalefac_data(); asf_snf_data(); } else { ssf_data(b_iframe); } } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.7.4 sf_hsf_data - Spectral frontend HSF extension data | Table 36a: Syntax of sf_hsf_data() Syntax No. of bits sf_hsf_data() { asf_hsf_spectral_data(); asf_hsf_scalefac_data(); asf_hsf_snf_data(); } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8 Audio spectral frontend | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.1 asf_transform_info - ASF transform info | Table 37: Syntax of asf_transform_info() Syntax No. of bits asf_transform_info() { if (frame_len_base >= 1536) { b_long_frame; ........................................................................ 1 if (b_long_frame == 0) { transf_length[0]; ............................................................... 2 transf_le... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.2 asf_psy_info - ASF scale factor band info | Table 38: Syntax of asf_psy_info() Syntax No. of bits asf_psy_info(b_dual_maxsfb, b_side_limited) { b_different_framing = 0; if (frame_len_base >= 1536 && (b_long_frame == 0) && (transf_length[0] != transf_length[1])) { b_different_framing = 1; } if (b_side_limited) { max_sfb_side[0]; ..................................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.3 asf_section_data - ASF section data | Table 39: Syntax of asf_section_data() Syntax No. of bits asf_section_data() { for (g = 0; g < num_window_groups; g++) { transf_length_g = get_transf_length(g); if (transf_length_g <= 2) { sect_esc_val = ( 1 << 3 ) - 1; // = 7 n_sect_bits = 3; } else { sect_esc_val = ( 1 << 5 ) - 1; // = 31 n_sect_bits = 5; } k = 0; i ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.4 asf_spectral_data - ASF spectral data | Table 40: Syntax of asf_spectral_data() Syntax No. of bits asf_spectral_data() { for (g = 0; g < num_window_groups; g++) { for (i = 0; i < num_sec_lsf[g]; i++) { if (sect_cb[g][i] != 0 && sect_cb[g][i] <= 11) { sect_start_line = sect_sfb_offset[g][sect_start[g][i]]; sect_end_line = sect_sfb_offset[g][sect_end[g][i]]; f... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.5 asf_scalefac_data - ASF scale factor data | Table 41: Syntax of asf_scalefac_data() Syntax No. of bits asf_scalefac_data() { reference_scale_factor; .................................................................. 8 first_scf_found = 0; for (g = 0; g < num_window_groups; g++) { max_sfb = min(get_max_sfb(g), num_sfb_48(get_transf_length(g)); for (sfb = 0; sfb <... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.6 asf_snf_data - ASF spectral noise fill data | Table 42: Syntax of asf_snf_data() Syntax No. of bits asf_snf_data(b_iframe) { if (b_snf_data_exists) { .................................................................. 1 for (g = 0; g < num_window_groups; g++) { transf_length_g = get_transf_length(g); max_sfb = min(get_max_sfb(g), num_sfb_48(transf_length_g); for (s... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.7 asf_hsf_spectral_data - ASF spectral data for HSF extension | Table 42a: Syntax of asf_hsf_spectral_data() Syntax No of bits asf_hsf_spectral_data() { for (g = 0; g < num_window_groups; g++) { for (i = num_sec_lsf[g]; i < num_sec[g]; i++) { if (sect_cb[g][i] != 0 && sect_cb[g][i] <= 11) { sect_start_line = sect_sfb_offset[g][sect_start[g][i]]; sect_end_line = sect_sfb_offset[g][s... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.8 asf_hsf_scalefac_data - ASF scale factor data for HSF extension | Table 42b: Syntax of asf_hsf_scalefac_data() Syntax No. of bits asf_hsf_scalefac_data() { for (g = 0; g < num_window_groups; g++) { start_sfb = num_sfb_48(get_transf_length(g)); for (sfb = start_sfb; sfb < get_max_sfb_hsf(g); sfb++) { if (sfb_cb[g][sfb] != 0) { if (max_quant_idx[g][sfb] > 0) { if (first_scf_found == 1)... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.8.9 asf_hsf_snf_data - ASF spectral noise fill data for HSF extension | Table 42c: Syntax of ac4_hsf_snf_data() Syntax No. of bits asf_hsf_snf_data() { if (b_snf_data_exists) { for (g = 0; g < num_window_groups; g++) { start_sfb = num_sfb_48(get_transf_length(g)); for (sfb = start_sfb; sfb < get_max_sfb_hsf(g); sfb++) { if ((sfb_cb[g][sfb] == 0) || (max_quant_idx[g][sfb] == 0)) { dpcm_snf[... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.9 Speech spectral frontend | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.9.1 ssf_data - Speech spectral frontend data | Table 43: Syntax of ssf_data() Syntax No. of bits ssf_data(b_iframe) { if (b_iframe) { b_ssf_iframe = 1; } else { b_ssf_iframe; ....................................................................... 1 } ssf_granule(b_ssf_iframe); if (frame_len_base >= 1536) { ssf_granule(0); } } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07)... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.9.2 ssf_granule - Speech spectral frontend granule | Table 44: Syntax of ssf_granule() Syntax No. of bits ssf_granule(b_iframe) { stride_flag; ............................................................................. 1 if (b_iframe == 1) { num_bands_minus12; .................................................................. 3 num_bands = num_bands_minus12 + 12; } sta... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.9.3 ssf_st_data - Speech spectral frontend static data | Table 45: Syntax of ssf_st_data() Syntax No. of bits ssf_st_data() { env_curr_band0_bits; ..................................................................... 5 if ((b_iframe == 1) && (stride_flag == SHORT_STRIDE)) { env_startup_band0_bits; ............................................................. 5 } if (stride_f... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.9.4 ssf_ac_data - Speech spectral frontend arithmetic coded data | Table 46: Syntax of ssf_ac_data() Syntax No. of bits ssf_ac_data() { env_curr_ac_bits; // num_bands-1 values ............ VAR if ((b_iframe == 1) && (stride_flag == SHORT_STRIDE)) { env_startup_ac_bits; // num_bands-1 values .............. VAR } num_blocks = (stride_flag == SHORT_STRIDE) ? 4 : 1; for (block = 0; block ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.10 Stereo audio processing | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.10.1 chparam_info -Stereo information | Table 47: Syntax of chparam_info() Syntax No. of bits chparam_info() { sap_mode; ................................................................................. 2 if (sap_mode == 1) { for (g = 0; g < num_window_groups; g++) { max_sfb_g = get_max_sfb(g); for (sfb = 0; sfb < max_sfb_g; sfb++) { ms_used[g][sfb]; .......... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.10.2 sap_data - Stereo audio processing data | Table 48: Syntax of sap_data() Syntax No. of bits sap_data() { sap_coeff_all; ........................................................................... 1 if (sap_coeff_all == 0) { for (g = 0; g < num_window_groups; g++) { max_sfb_g = get_max_sfb(g); for (sfb = 0; sfb < max_sfb_g; sfb += 2) { sap_coeff_used[g][sfb]; .... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.11 Companding control | Table 49: Syntax of companding_control() Syntax No. of bits companding_control(num_chan) { sync_flag = 0; if (num _chan > 1) { sync_flag; .......................................................................... 1 } b_need_avg = 0; nc = sync_flag ? 1 : num_chan; for (ch = 0; ch < nc; ch++) { b_compand_on[ch]; ........... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12 Advanced spectral extension - A-SPX | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.1 aspx_config - A-SPX configuration | Table 50: Syntax of aspx_config() Syntax No. of bits aspx_config() { aspx_quant_mode_env; ..................................................................... 1 aspx_start_freq; ......................................................................... 3 aspx_stop_freq; .................................................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.2 aspx_data_1ch - A-SPX 1-channel data | Table 51: Syntax of aspx_data_1ch() Syntax No. of bits aspx_data_1ch(b_iframe) { if (b_iframe) aspx_xover_subband_offset; .......................................................... 3 aspx_framing(0); aspx_qmode_env[0] = aspx_quant_mode_env; if (aspx_int_class[0] == FIXFIX && aspx_num_env[0] == 1) aspx_qmode_env[0] = 0;... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.3 aspx_data_2ch - A-SPX 2-channel data | Table 52: Syntax of aspx_data_2ch() Syntax No. of bits aspx_data_2ch(b_iframe) { if (b_iframe) aspx_xover_subband_offset; ........................................................... 3 aspx_framing(0); aspx_qmode_env[0] = aspx_qmode_env[1] = aspx_quant_mode_env; if (aspx_int_class[0] == FIXFIX && aspx_num_env[0] == 1) a... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.4 aspx_framing - A-SPX framing | Table 53: Syntax of aspx_framing() Syntax No. of bits aspx_framing(ch) { aspx_num_rel_left[ch] = 0; aspx_num_rel_right[ch] = 0; aspx_int_class[ch]; .................................................................. 1...3 switch (aspx_int_class[ch]) { case FIXFIX: envbits = aspx_num_env_bits_fixfix + 1; aspx_num_env[ch]... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.5 aspx_delta_dir - A-SPX direction of envelope delta coding | Table 54: Syntax of aspx_delta_dir() Syntax No. of bits aspx_delta_dir(ch) { for (env = 0; env < aspx_num_env[ch]; env++) // Note aspx_sig_delta_dir[ch][env]; ......................................................... 1 for (env = 0; env < aspx_num_noise[ch]; env++) // Note aspx_noise_delta_dir[ch][env]; .................. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.8 aspx_ec_data - A-SPX entropy coded data | Table 57: Syntax of aspx_ec_data() Syntax No. of bits aspx_ec_data(data_type, num_env, freq_res, quant_mode, stereo_mode, direction) { for (env = 0; env < num_env; env++) { if (data_type == SIGNAL) { if (freq_res[env]) num_sbg = num_sbg_sig_highres; // Note else num_sbg = num_sbg_sig_lowres; // Note } else { num_sbg = ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.12.9 aspx_huff_data - A-SPX Huffman data | Table 58: Syntax of aspx_huff_data() Syntax No. of bits aspx_huff_data(data_type, num_sbg, quant_mode, stereo_mode, direction) { if (direction == 0) { // FREQ aspx_hcb = get_aspx_hcb(data_type, quant_mode, stereo_mode, F0); a_huff_data[0] = huff_decode(aspx_hcb, aspx_hcw); .................................. 1…x aspx_hc... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13 Advanced coupling - A-CPL | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.1 acpl_config_1ch - A-CPL 1-channel configuration | Table 59: Syntax of acpl_config_1ch() Syntax No. of bits acpl_config_1ch(acpl_1ch_mode) { acpl_qmf_band = 0; acpl_param_band = 0; acpl_num_param_bands_id; ................................................................. 2 acpl_quant_mode; ......................................................................... 1 if (... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.2 acpl_config_2ch - A-CPL 2-channel configuration | Table 60: Syntax of acpl_config_2ch() Syntax No. of bits acpl_config_2ch() { acpl_qmf_band = 0; acpl_param_band = 0; acpl_num_param_bands_id; ................................................................. 2 acpl_quant_mode_0; ....................................................................... 1 acpl_quant_mode_1... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.3 acpl_data_1ch - A-CPL 1-channel data | Table 61: Syntax of acpl_data_1ch() Syntax No. of bits acpl_data_1ch() { acpl_framing_data(); num_bands = acpl_num_param_bands; start = acpl_param_band; acpl_alpha1 = acpl_ec_data(ALPHA, num_bands, start, acpl_quant_mode); acpl_beta1 = acpl_ec_data(BETA, num_bands, start, acpl_quant_mode); } ETSI ETSI TS 103 190-1 V1.4... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.4 acpl_data_2ch - A-CPL 2-channel data | Table 62: Syntax of acpl_data_2ch() Syntax No. of bits acpl_data_2ch() { acpl_framing_data(); num_bands = acpl_num_param_bands; st = acpl_param_band; acpl_alpha1 = acpl_ec_data(ALPHA, num_bands, st, acpl_quant_mode_0); acpl_alpha2 = acpl_ec_data(ALPHA, num_bands, st, acpl_quant_mode_0); acpl_beta1 = acpl_ec_data(BETA, ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.5 acpl_framing_data - A-CPL framing data | Table 63: Syntax of acpl_framing_data() Syntax No. of bits acpl_framing_data() { acpl_interpolation_type; ................................................................. 1 acpl_num_param_sets_cod; ................................................................. 1 if (acpl_interpolation_type == 1) { for (ps = 0; ps <... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.6 acpl_ec_data - A-CPL entropy coded data | Table 64: Syntax of acpl_ec_data() Syntax No. of bits acpl_ec_data(data_type, data_bands, start_band, quant_mode) { for (ps = 0; ps < acpl_num_param_sets_cod + 1; ps++) { a_param_set[ps] = acpl_huff_data( data_type, data_bands, start_band, quant_mode); } return a_param_set; } ETSI ETSI TS 103 190-1 V1.4.1 (2025-07) 61 |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.13.7 acpl_huff_data - A-CPL Huffman data | Table 65: Syntax of acpl_huff_data() Syntax No. of bits acpl_huff_data(data_type, data_bands, start_band, quant_mode) { diff_type; ............................................................................... 1 if (diff_type == 0) { // DIFF_FREQ acpl_hcb = get_acpl_hcb(data_type, quant_mode, F0); a_huff_data[start_ba... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14 Metadata | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.1 metadata() - Metadata | Table 66: Syntax of metadata() Syntax No. of bits metadata(b_iframe) { basic_metadata(); extended_metadata(); tools_metadata_size = tools_metadata_size_value; ......................................... 7 if (b_more_bits) { ........................................................................ 1 tools_metadata_size += ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.2 basic_metadata - Basic metadata | Table 67: Syntax of basic_metadata() Syntax No. of bits basic_metadata(channel_mode) { dialnorm_bits; ........................................................................... 7 if (b_more_basic_metadata) { .............................................................. 1 if (b_further_loudness_info) { .................. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.3 further_loudness_info - Additional loudness information | Table 68: Syntax of further_loudness_info() Syntax No. of bits further_loudness_info() { loudness_version; ........................................................................ 2 if (loudness_version == 3) { loudness_version += extended_loudness_version; ...................................... 4 } loud_prac_type; ...... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.4 extended_metadata - Extended metadata | Table 69: Syntax of extended_metadata() Syntax No. of bits extended_metadata(channel_mode, b_associated, b_dialog) { if (b_associated) { if (b_scale_main) { .................................................................. 1 scale_main; .................................................................... 8 } if (b_sca... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.5 drc_frame - DRC frame | Table 70: Syntax of drc_frame() Syntax No. of bits drc_frame(b_iframe) { if (b_drc_present) { ...................................................................... 1 if (b_iframe) { drc_config(); } drc_data(); } } |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.6 drc_config - DRC configuration | Table 71: Syntax of drc_config() Syntax No. of bits drc_config() { drc_decoder_nr_modes; ..................................................................... 3 for (m = 0; m <= drc_decoder_nr_modes; m++) { drc_decoder_mode_config(); drc_decoder_mode[m] = drc_decoder_mode_id; } drc_eac3_profile; .......................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.7 drc_decoder_mode_config - DRC decoder mode configuration | Table 72: Syntax of drc_decoder_mode_config() Syntax No. of bits drc_decoder_mode_config() { drc_decoder_mode_id; ...................................................................... 3 if (drc_decoder_mode_id > 3) { drc_output_level_from[drc_decoder_mode_id]; .......................................... 5 drc_output_le... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.8 drc_compression_curve - Compression curve parameters | Table 73: Syntax of drc_compression_curve() Syntax No. of bits drc_compression_curve() { drc_lev_nullband_low; ..................................................................... 4 drc_lev_nullband_high; .................................................................... 4 drc_gain_max_boost; .......................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.9 drc_data -DRC frame-based data | Table 74: Syntax of drc_data() Syntax No. of bits drc_data() { curve_present = 0; for (m = 0; m <= drc_decoder_nr_modes; m++) { mode_id = drc_decoder_mode[m]; if (drc_compression_curve_flag[mode_id] == 0) { drc_gainset_size = drc_gainset_size_value; ...................................... 6 if (b_more_bits) { ............. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.10 drc_gains - DRC gains | Table 75: Syntax of drc_gains() Syntax No. of bits drc_gains(mode) { drc_gain[0][0][0] = drc_gain_val; ......................................................... 7 if (drc_gains_config[mode] > 0) { for (ch = 0; ch < nr_drc_channels; ch++) { for (band = 0; band < nr_drc_bands; band++) for (sf = 0; sf < nr_drc_subframes; ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.11 dialog_enhancement - Dialog enhancement metadata | Table 76: Syntax of dialog_enhancement() Syntax No. of bits dialog_enhancement(b_iframe) { if (b_de_data_present) { .................................................................. 1 if (b_iframe) { de_config(); } elseif (de_config_flag) { .......................................................... 1 de_config(); } de... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.12 de_config - Dialog enhancement configuration | Table 77: Syntax of de_config() Syntax No. of bits de_config() { de_method; ................................................................................ 2 de_max_gain; .............................................................................. 2 de_channel_config; ................................................... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.13 de_data - Dialog enhancement data | Table 78: Syntax of de_data() Syntax No. of bits de_data(de_method, de_nr_channels, b_iframe) { if (de_nr_channels > 0) { if ((de_method == 1 || de_method == 3) && de_nr_channels > 1) { if (b_iframe) { de_keep_pos_flag = 0; } else { de_keep_pos_flag; ............................................................. 1 } if ... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.14 emdf_payload_config - EMDF payload configuration | Table 79: Syntax of emdf_payload_config() Syntax No. of bits emdf_payload_config() { if (b_smpoffst) { ......................................................................... 1 smpoffst = variable_bits(11); } if (b_duration) { ......................................................................... 1 duration = vari... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.2.14.15 emdf_reserved - EMDF reserved data | Table 80: Syntax of emdf_reserved() Syntax No. of bits emdf_protection() { n_skip_bytes_length_primary; ................................................................. 2 n_skip_bytes_length_secondary; ............................................................... 2 n_skip_bytes = 0; if (n_skip_bytes_length_primary >... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3 Description of bitstream elements | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.0 Introduction | A number of bitstream element elements have values that can be transmitted, but whose meaning has been reserved. If a decoder receives a bitstream that contains reserved values, the decoder can be able to decode and produce audio. In the description of bitstream elements that have reserved codes, there is an indication... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.1 raw_ac4_frame - raw AC-4 frame | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.1.1 fill_area - fill area | This element is used to pad the raw_ac4_frame to a certain transmission frame size. Padding can occur before the first ac4_substream_data or after the last ac4_substream_data. The start of the first ac4_substream_data is given by the payload base offset; the end of the frame can only be determined from size information... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.1.2 Void | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.1.3 byte_align - byte alignment bits | This element is used for the byte alignment of the raw_ac4_frame() element. Byte alignment is defined relative to the start of the enclosing syntactic element. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.2 variable_bits - Variable bits | |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.2.0 Encoding | The variable_bits() method is an extension mechanism for variable bit-length elements to use more bits for the element than the minimum element length. This method enables efficient coding of small field values with extensibility to be able to express arbitrarily large field values. Field values are split into one or m... |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.2.1 read - read bits | This element is used to determine the value of variable_bits as specified by the syntax box in clause 4.2.2. The size of this bit field is specified by the parameter n_bits. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.2.2 b_read_more - read more flag | This Boolean indicates whether additional read bits are present. |
79462c15429e4b02e874d57a1faa88a5 | 103 190-1 | 4.3.3 AC-4 frame information |
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