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6.3.3.1.26 b_associate_is_mono
This flag indicates whether the associated audio substream is a mono stream.
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6.3.3.1.27 pres_ch_mode
This helper variable indicates the (virtual) channel mode of the presentation. pres_ch_mode can be derived from ac4_toc information as indicated by the pseudocode in Table 93. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 144 Table 93: Pseudocode pres_ch_mode = -1; b_obj_or_ajoc = 0; for (sg = 0; sg < n_substream_groups; sg+...
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6.3.3.1.28 pres_ch_mode_core
This helper variable indicates the (virtual) core channel mode of the presentation. The core channel mode of a substream is derived from substream properties as indicated in Table 94. Table 94: ch_mode_core Substream properties Core channel mode ch_mode_core In ac4_substream_group_info: b_channel_coded = 0 and b_ajoc =...
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6.3.3.1.29 b_pres_4_back_channels_present
This helper flag is a logical disjunction of all b_4_back_channels_present flags of all substreams in the presentation that carry that flag.
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6.3.3.1.30 pres_top_channel_pairs
This helper variable shall be initialized according to Table 96. Table 96: pres_top_channel_pairs pres_top_channel_pairs Condition 0 top_channels_present is 0 for all substreams in the presentation that carry that flag 1 at least one substream in the presentation that carries top_channels_present has this one set to 1 ...
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6.3.3.1.31 b_pres_has_lfe
This helper flag indicates whether a LFE is present in the presentation. It is set if at least one substream in the presentation contains a LFE. If pres_ch_mode ≥ 0, the presence of a LFE is determined by the function channel_mode_contains_Lfe(). If pres_ch_mode is -1, the presence of a LFE is determined by the conditi...
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6.3.3.2 oamd_substream
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6.3.3.2.1 Introduction
The oamd_substream element is referenced in the substream group. The same oamd_substream element can be referenced by several substream groups.
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6.3.3.2.2 b_oamd_common_data_present
The b_oamd_common_data_present flag indicates whether oamd_common_data is present in the corresponding oamd_substream.
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6.3.3.2.3 b_oamd_timing_present
The b_oamd_timing_present flag indicates whether oamd_timing_data is present in the corresponding oamd_substream. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 146
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6.3.4 Audio data
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6.3.4.1 b_some_signals_inactive
The b_some_signals_inactive flag indicates whether some of the signals present in var_channel_element contain coded silence as indicated by dmx_active_signals_mask.
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6.3.4.2 dmx_active_signals_mask
The dmx_active_signals_mask element signals which of the signals present in var_channel_element contain coded silence. NOTE: The bit mask is ordered as follows: MSB is the first signal in bitstream order, LSB is the last signal in bitstream order.
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6.3.4.3 b_dmx_timing
The b_dmx_timing flag indicates whether an individual OAMD timing data instance is present for core decoding mode.
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6.3.4.4 b_oamd_extension_present
The b_oamd_extension_present flag indicates whether OAMD extension data is present. NOTE: OAMD extension data is reserved for future use.
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6.3.4.5 skip_data
The skip_data element holds additional data and is reserved for future use.
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6.3.4.6 b_umx_timing
The b_umx_timing flag indicates whether an individual OAMD timing data instance is present for full decoding mode.
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6.3.4.7 b_derive_timing_from_dmx
The b_derive_timing_from_dmx flag indicates whether the OAMD timing data instance present for core decoding mode is also valid for full decoding mode.
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6.3.5 Channel elements
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6.3.5.1 immersive_codec_mode_code
For parsing immersive_codec_mode_code first one bit shall be read, if this bit is zero another two bits shall be read. The bitcode indicates the immersive_codec_mode for the immersive_channel_element as shown in Table 97. Table 97: Immersive codec mode immersive_codec_mode_code immersive_codec_mode Description value de...
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6.3.5.2 core_channel_config
This helper variable indicates the core channel configuration which is used in the bitstream syntax of the immersive_channel_element and can be derived from the immersive_codec_mode as shown in Table 98. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 147 Table 98: Core channel configuration immersive_codec_mode core_channel_c...
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6.3.5.3 core_5ch_grouping
The core_5ch_grouping indicates the core channel data element grouping as shown in Table 99. Table 99: Core channel data element grouping core_5ch_grouping Core channel data element grouping 0 1+2+2 1 3+2 2 1+4 3 5
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6.3.5.4 22_2_codec_mode
This bit indicates the 22.2 codec mode as shown in Table 100. Table 100: 22.2 codec mode 22_2_codec_mode 22.2 codec mode 0 = SIMPLE Simple 1 = ASPX A-SPX
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6.3.5.5 var_codec_mode
This bit indicates the codec mode of the var_channel_element() as shown in Table 101. Table 101: var codec mode var_codec_mode var codec mode 0 = SIMPLE Simple 1 = ASPX A-SPX
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6.3.5.6 var_coding_config
This bit indicates the coding configuration of the var_channel_element().
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6.3.6 Advanced Joint Object Coding (A-JOC)
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6.3.6.1 ajoc
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6.3.6.1.1 ajoc_num_decorr
This element indicates the number of decorrelators to be used for the A-JOC reconstruction.
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6.3.6.2 ajoc_config
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6.3.6.2.1 ajoc_decorr_enable[d]
This flag indicates whether the decorrelator with index d is enabled. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 148
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6.3.6.2.2 ajoc_object_present[o]
This flag indicates whether the reconstructed object with index o is present.
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6.3.6.2.3 ajoc_num_bands_code[o]
This element indicates the number of parameter bands, ajoc_num_bands, for the reconstructed object with index o according to Table 102. Table 102: ajoc_num_bands_code ajoc_num_bands_code ajoc_num_bands 0 23 1 15 2 12 3 9 4 7 5 5 6 3 7 1
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6.3.6.2.4 ajoc_quant_select
This element indicates the quantization mode for the reconstructed object with index o according to Table 103. Table 103: ajoc_quant_select ajoc_quant_select Meaning 0 Fine 1 Coarse
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6.3.6.2.5 ajoc_sparse_select
This element indicates the reconstruction mode for the reconstructed object with index o according to Table 104. Table 104: ajoc_sparse_select ajoc_sparse_select Meaning 0 Upmix from all 1 Upmix from some - read sparse mask values
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6.3.6.2.6 ajoc_sparse_mask_dry[o][ch]
Sparse mask values for the dry matrix elements. This bit is indicating if the dry matrix element should be included which means the given input ch is factored into the reconstruction of the corresponding output o.
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6.3.6.2.7 ajoc_sparse_mask_wet[o][d]
Sparse mask values for the wet matrix elements. This bit is indicating if the wet matrix element should be included which means the given decorrelator output d is factored into the reconstruction of the corresponding output o.
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6.3.6.3 ajoc_data
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6.3.6.3.1 ajoc_b_nodt
This element indicates whether time-differential coding is allowed in the current A-JOC frame. Time-differential coding is only allowed if ajoc_b_nodt = 0. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 149
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6.3.6.4 ajoc_data_point_info
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6.3.6.4.1 ajoc_num_dpoints
This element indicates the number of A-JOC data points.
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6.3.6.4.2 ajoc_start_pos
This element indicates the first QMF time slot that is included in the interpolation of an reconstruction matrix element from old to new values.
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6.3.6.4.3 ajoc_ramp_len_minus1
This element indicates the length of the interpolation ramp ajoc_ramp_len = ajoc_ramp_len_minus1 + 1, from old to new values of an reconstruction matrix element in QMF time slots.
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6.3.6.5 ajoc_huff_data
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6.3.6.5.1 diff_type
This value indicates the type of differential coding according to Table 105. Table 105: diff_type diff_type Description 0 Frequency differential coding 1 Time differential coding
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6.3.6.5.2 ajoc_hcw
The ajoc_hcw element is a Huffman coded code word for the A-JOC data. The pseudocode in Table 106 describes how to determine the correct Huffman table for decoding the Huffman code words. Table 106: Pseudocode get_ajoc_hcb(data_type, quant_mode, hcb_type) { // data_type = {DRY, WET} // quant_mode = {COARSE, FINE} // hc...
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6.3.6.6 ajoc_dmx_de_data
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6.3.6.6.1 b_dmx_de_cfg
This flag indicates whether a dialogue enhancement configuration is present.
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6.3.6.6.2 b_keep_dmx_de_coeffs
This flag indicates whether to use the same dialogue downmix coefficients as in the previous AC-4 frame. If the b_keep_dmx_de_coeffs flag is not set, new dialogue downmix coefficients are present in the bitstream. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 150
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6.3.6.6.3 de_main_dlg_mask
The de_main_dlg_mask element is a bitmask indicating which objects represent the main dialogue that should be boosted when dialogue enhancement is enabled. A binary one denotes a DE enabled object. The function dlg_obj(), as specified in Table 107, shows how to derive the helper elements num_dlg_obj and dlg_idx[] from ...
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6.3.6.6.4 de_dlg_dmx_coeff_idx
The de_dlg_dmx_coeff_idx elements contain quantized downmix coefficients for the main dialogue objects. The conversion into de_dlg_dmx_coeff values shall be done according to Table 108. Table 108: de_dlg_dmx_coeff de_dlg_dmx_coeff_idx de_dlg_dmx_coeff 0b0 0 0b10000 1/15 0b10001 2/15 0b10010 3/15 0b10011 4/15 0b10100 5/...
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6.3.7 Advanced Joint Channel Coding (A-JCC)
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6.3.7.1 ajcc_data
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6.3.7.1.1 b_no_dt
The b_no_dt flag indicates whether the present parameters are delta-frequency coded, or if some of the present parameters could also be delta-time coded, as shown in Table 109. Table 109: b_no_dt b_no_dt Description 0 present parameters are delta-frequency or delta-time coded 1 all parameters are delta-frequency coded ...
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6.3.7.1.2 ajcc_num_param_bands_id
The ajcc_num_param_bands_id element indicates the number of parameter bands as index to Table 110. Table 110: ajcc_num_bands_table ajcc_num_param_bands_id ajcc_num_bands_table[ajcc_num_param_bands_id] 0 15 1 12 2 9 3 7
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6.3.7.1.3 ajcc_core_mode
The ajcc_core_mode indicates the channel configuration of the Advanced Joint Channel coded core, as shown in Table 111. Table 111: ajcc_core_mode ajcc_core_mode Present channels 0 L, R, C, Ls, Rs 1 L, R, C, Tfl, Tfr NOTE: ajcc_core_mode is only present in case of b_5fronts = 0.
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6.3.7.1.4 ajcc_qm_f
The ajcc_qm_f indicates the quantization mode for the parameter which are related to the front channels, as shown in Table 112. Table 112: ajcc_qm_f ajcc_qm_f Description 0 fine quantization 1 coarse quantization
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6.3.7.1.5 ajcc_qm_b
The ajcc_qm_b indicates the quantization mode for the parameter which are related to the back channels, as shown in Table 113. Table 113: ajcc_qm_b ajcc_qm_b Description 0 fine quantization 1 coarse quantization
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6.3.7.1.6 ajcc_qm_ab
The ajcc_qm_ab indicates the quantization mode for the alpha and beta parameter, as shown in Table 114. Table 114: ajcc_qm_ab ajcc_qm_ab Description 0 fine quantization 1 coarse quantization
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6.3.7.1.7 ajcc_qm_dw
The ajcc_qm_dw indicates the quantization mode for the dry and wet parameter, as shown in Table 115. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 152 Table 115: ajcc_qm_dw ajcc_qm_dw Description 0 fine quantization 1 coarse quantization
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6.3.7.2 ajcc_framing_data
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6.3.7.2.1 ajcc_interpolation_type
This value indicates the type of interpolation used as shown in Table 116. Table 116: ajcc_interpolation_type ajcc_interpolation_type Meaning 0 smooth A-JCC interpolation 1 steep A-JCC interpolation
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6.3.7.2.2 ajcc_num_param_sets_code
This element indicates the value ajcc_num_param_sets as shown in Table 117. ajcc_num_param_sets describes how many A-JCC parameter sets per frame are transmitted in the bitstream. Table 117: ajcc_num_param_sets ajcc_num_param_sets_code ajcc_num_param_sets 0 1 1 2
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6.3.7.2.3 ajcc_param_timeslot
When steep interpolation is used, this value indicates the QMF time slot (0-31) at which the A-JCC parameter set values change.
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6.3.7.3 ajcc_huff_data
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6.3.7.3.1 diff_type
This bitstream element has been described in clause 6.3.6.5.1.
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6.3.7.3.2 ajcc_hcw
The ajcc_hcw element is a Huffman coded code word for the A-JCC data. The pseudocode in Table 118 describes how to determine the correct Huffman table for decoding the Huffman code words. Table 118: Pseudocode get_ajcc_hcb(data_type, quant_mode, hcb_type) { // data_type = {ALPHA, BETA, DRY, WET} // quant_mode = {COARSE...
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6.3.8 Metadata
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6.3.8.1 basic_metadata - Basic metadata
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6.3.8.1.1 b_substream_loudness_info
This flag indicates whether substream loudness information is present.
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6.3.8.1.2 substream_loudness_bits
The substream_loudness_bits element specifies the substream loudness in dBFS, in steps of ¼ dBFS: substream_loudness = −substream_loudness_bits/4dB67
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6.3.8.1.3 b_further_substream_loudness_info
This flag indicates whether additional substream loudness information is present in a further_loudness_info() element.
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6.3.8.1.4 dialnorm_bits
The dialnorm_bits element signals the dialnorm value for the substream. If presentation_version is 0, the dialnorm value of each dialogue substream shall be the dialnorm value for the mix of music and effects (M+E) substream and the dialogue substream. When mixing music and effects (M+E), dialogue and associate substre...
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6.3.8.1.5 loro_dmx_loud_corr
The loro_dmx_loud_corr element signals the loudness correction that shall be applied when downmixing the substream to LoRo. If presentation_version is 0, the loro_dmx_loud_corr value of each dialogue substream shall be the loro_dmx_loud_corr value for the mix of music and effects (M+E) substream and the dialogue substr...
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6.3.8.1.6 ltrt_dmx_loud_corr
If presentation_version is 0, the ltrt_dmx_loud_corr value of each dialogue substream shall be the ltrt_dmx_loud_corr value for the mix of music and effects (M+E) substream and the dialogue substream.
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6.3.8.2 further_loudness_info - Additional loudness information
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6.3.8.2.1 b_rtllcomp
This flag indicates whether realtime loudness correction data is present.
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6.3.8.2.2 rtll_comp
This field indicates the realtime loudness correction factor rtll_comp_gain, which can be calculated as: rtll_comp_gain = rtll_comp$−$128 /4dB
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6.3.8.3 dialog_enhancement - Dialogue enhancement
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6.3.8.3.1 b_de_simulcast
This bit indicates whether separate dialogue enhancement data for core decoding is present.
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6.3.8.4 Channel mode query functions
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6.3.8.4.1 channel_mode_contains_Lfe()
This function returns true if the channel mode contains a Low-Frequency Effects channel. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 154 Table 119: Pseudocode channel_mode_contains_Lfe() { if (ch_mode in [4,6,8,10,12,14,15]) { return TRUE; } return FALSE; }
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6.3.8.4.2 channel_mode_contains_c()
This function returns true if the channel mode contains a Centre channel. Table 120: Pseudocode channel_mode_contains_c() { if (ch_mode == 0 || (ch_mode >= 2 && ch_mode <= 15)) { return TRUE; } return FALSE; }
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6.3.8.4.3 channel_mode_contains_lr()
This function returns true if the channel mode contains a Left and a Right channel. Table 121: Pseudocode channel_mode_contains_lr() { if (ch_mode >= 1 && ch_mode <= 15) { return TRUE; } return FALSE; }
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6.3.8.4.4 channel_mode_contains_LsRs()
This function returns true if the channel mode contains a Left Surround and a Right Surround channel. Table 122: Pseudocode channel_mode_contains_LsRs() { if (ch_mode >= 3 && ch_mode <= 15) { return TRUE; } return FALSE; } ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 155
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6.3.8.4.5 channel_mode_contains_LrsRrs()
This function returns true if the channel mode contains a Left Rear Surround and a Right Rear Surround channel. Table 123: Pseudocode channel_mode_contains_LrsRrs() { if (ch_mode == 5 || ch_mode == 6 || (ch_mode >= 11 && ch_mode <= 15)) { return TRUE; } return FALSE; }
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6.3.8.4.6 channel_mode_contains_LwRw()
This function returns true if the channel mode contains a Left Wide and a Right Wide channel. Table 124: Pseudocode channel_mode_contains_LwRw() { if (ch_mode == 7 || ch_mode == 8 || (ch_mode >= 13 && ch_mode <= 15)) { return TRUE; } return FALSE; }
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6.3.8.4.7 channel_mode_contains_VhlVhr()
This function returns true if the channel mode contains a Left Vertical Height and a Right Vertical Height channel. Table 125: Pseudocode channel_mode_contains_VhlVhr() { if (ch_mode == 9 || ch_mode == 10) { return TRUE; } return FALSE; }
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6.3.8.5 pan_signal_selector
This 2-bit field shall be evaluated if all of the following conditions are met: • channel_mode is 2 (indicating 3 channels) • 3_0_channel_element is used • 3_0_codec_mode is set to SIMPLE • 3_0_coding_config is set to 1 If all of the above conditions are met and the value of pan_signal_selector is larger than 0, decodi...
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6.3.9 Object Audio Metadata (OAMD)
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6.3.9.1 Introduction
Object audio metadata (OAMD) comprise parameters that describe properties of audio objects.
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6.3.9.2 oamd_common_data - OAMD common data
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6.3.9.2.1 Introduction
The oamd_common_data contains properties, which are common to all objects in the corresponding substream group.
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6.3.9.2.2 b_default_screen_size_ratio
The b_default_screen_size_ratio flag indicates whether the decoder assumes a default value of 1,0 for master_screen_size_ratio.
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6.3.9.2.3 master_screen_size_ratio_code
The master_screen_size_ratio_code bitstream element indicates the master_screen_size_ratio, which defines the ratio, in the mastering room, of the width of the screen to the distance between the L and R speakers. If master_screen_size_ratio = 1, the L and R speakers in the mastering room were located on the edge of the...
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6.3.9.2.4 b_bed_object_chan_distribute
The b_bed_object_chan_distribute flag indicates whether the channel distribution of bed objects is activated. If activated, one bed object can be distributed over multiple channels.
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6.3.9.3 oamd_timing_data
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6.3.9.3.1 Introduction
The oamd_timing_data element provides timing information to be utilized for synchronization of object properties to the object essence audio samples. One oamd_timing_data element applies to all substreams in a substream group.
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6.3.9.3.2 sample_offset
The sample_offset value is a helper variable which indicates a timing offset value in audio samples.
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6.3.9.3.3 oa_sample_offset_type
The oa_sample_offset_type element uses a prefix code and indicates the configuration type for the sample_offset as shown in Table 127. Table 127: oa_sample_offset_type oa_sample_offset_type Description 0b0 sample_offset = 0 0b10 sample_offset is indicated by oa_sample_offset_code 0b11 sample_offset is indicated by oa_s...
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6.3.9.3.4 oa_sample_offset_code
The oa_sample_offset_code element indicates the sample_offset value by a prefix codeword as shown in Table 128. Table 128: oa_sample_offset_code oa_sample_offset_code sample_offset 0b0 16 0b10 8 0b11 24