hash stringlengths 32 32 | doc_id stringlengths 7 13 | section stringlengths 3 121 | content stringlengths 0 2.2M |
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9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.2.9.9 tool_t2_to_f_s_b | Syntax No of bits tool_t2_to_f_s_b() { b_top_to_front; .............................................................................. 1 if (b_top_to_front == 1) { gain_t2a_code; ............................................................................. 3 } else { b_top_to_side; ......................................... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.2.9.10 tool_t2_to_f_s | Syntax No of bits tool_t2_to_f_s() { b_top_to_front; .............................................................................. 1 if (b_top_to_front == 1) { gain_t2a_code; ............................................................................. 3 } else { gain_t2b_code; ........................................... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3 Description of bitstream elements | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.1 Introduction | The description of bitstream elements is done similar to the description in ETSI TS 103 190-1 [1]. Elements which have been described in ETSI TS 103 190-1 [1], clause 4.3 are not repeated in this clause unless their meaning has changed. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 133 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2 AC-4 frame info | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1 ac4_toc - AC-4 table of contents | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.1 bitstream_version | This 2-bit code which is extendable by variable_bits() indicates the bitstream version. A decoder implemented according to the present document shall decode bitstreams where bitstream_version ≤ 2. Table 75: bitstream_version bitstream_version Presentation information location Description 0 ac4_presentation_info() All p... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.2 br_code | The br_code value, in conjunction with the wait_frames value, supports accurate determination of the long term bitrate for average bitrate streams. For average bitrate streams, over successive frames a br_code value of 0b11 is followed by a sequence of br_code values different from 0b11. That sequence of values can be ... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.3 b_iframe_global | This flag indicates whether all substreams in all presentations are encoded independently from preceding frames (no dependency over time). b_audio_ndot = 1, b_pres_ndot = 1 and b_oamd_ndot = 1 indicate whether there is no dependency over time for the corresponding substream type. In case frame_rate_factor ≠ 1, the firs... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.4 b_program_id | This flag indicates whether program identification data is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.5 short_program_id | The short_program_id element holds the program identification as a 16 bit value. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.6 b_program_uuid_present | This flag indicates whether program identification as UUID value, program_uuid, is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.7 program_uuid | The program_uuid element holds the program identification as a 16 byte UUID value. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 134 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.1.8 total_n_substream_groups | The value of this helper variable is total_n_substream_groups = 1 + max_group_index, where max_group_index is the maximum of the group_index values contained in all occurrences of ac4_sgi_specifier. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2 ac4_presentation_v1_info - AC-4 presentation version 1 information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.1 b_single_substream_group | This flag indicates whether a single substream group is present. If not set, the number of substream groups, n_substream_groups, is determined using the value of presentation_config. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.2 presentation_config | This 3-bit code, which is extendable by variable_bits(), indicates the presentation configuration for presentation_version = 1 as shown in Table 77. The presentation configuration for presentation_version = 0 is specified in ETSI TS 103 190-1 [1], clause 4.3.3.3.4. Table 77: presentation_config for presentation_version... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.3 mdcompat | This field indicates the decoder compatibility as shown in Table 78. The mdcompat element indicates which decoder systems a presentation is compatible with. A decoder system with compatibility level n shall be able to decode all presentations with mdcompat ≤ n; and • presentation_version = 0 as defined in ETSI TS 103 1... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.4 b_presentation_group_index | This flag indicates whether the presentation belongs to a presentation group and that a presentation group index is present in the bitstream. The presentation group index presentation_group_index is derived from additional variable_bits(). |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.5 b_presentation_filter | This flag indicates whether the b_enable_presentation bit is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.6 b_enable_presentation | This flag indicates whether a presentation is enabled. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.7 b_multi_pid | This flag indicates whether the presentation is a multiple PID presentation. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.2.8 n_substream_groups_minus2 | The n_substream_groups_minus2 element indicates the number of substream groups minus 2. To get the number of substream groups, n_substream_groups, a value of 2 needs to be added to n_substream_groups_minus2. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.3 presentation_version - Presentation version information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.3.1 b_tmp | The b_tmp element, which might be present multiple times, is used to signal the version of the presentation. A presentation version value of 0 indicates a presentation which is decodable by an AC-4 decoder conforming to [1] or to the present document. A decoder implemented in accordance to the present document shall de... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.4 frame_rate_fractions_info - Frame rate fraction information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.4.1 b_frame_rate_fraction | This flag indicates whether the variable frame_rate_fraction is set to a value greater than 1. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.4.2 b_frame_rate_fraction_is_4 | This flag indicates whether the variable frame_rate_fraction is set to a value of 4. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5 ac4_substream_group_info - AC-4 substream group information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.1 b_substreams_present | This flag indicates whether a substream group contains substreams. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.2 n_lf_substreams_minus2 | The n_lf_substreams_minus2 element indicates the number of lf substreams present in a presentation. To get the number of lf substreams, n_lf_substreams, a value of 2 needs to be added to n_lf_substreams_minus2. Additional variable_bits() are used to derive the number of lf substreams for values of n_lf_substreams excee... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.3 b_channel_coded | This flag indicates whether the substreams contain channel based audio. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.4 sus_ver | This bit indicates the substream version for bitstreams with bitstream_version = 1. A value of 0 identifies a channel based audio substream using a bitstream syntax for ac4_substream() which is compatible to the syntax defined in [1]. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 136 A value of 1 indicates the usage of an ex... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.5 b_oamd_substream | This flag indicates whether a substream containing object audio metadata is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.5.6 b_ajoc | This flag indicates whether advanced joint object coding is used. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.6 ac4_sgi_specifier - AC-4 substream group information specifier | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.6.1 group_index | The group_index element, together with potential variable_bits(), indicates the substream group index of the related ac4_substream_group_info() element. The order of the referenced substream groups via ac4_sgi_specifier() elements within ac4_presentation_v1_info() is given by Table 77. EXAMPLE: For presentation_config ... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.1 Introduction | The three fields b_4_channel_present, b_centre_present, and top_channels_present signal whether some of the channels as signalled by channel_mode are actually present in the original content (i.e. the audio signals fed to the AC-4 encoder during content creation) or not. This enables to signal and represent original co... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.2 channel_mode | This variable length field indicates the channel mode and the variable ch_mode as shown in Table 79, which is an extension of ETSI TS 103 190-1 [1], table 87. Table 79: channel_mode channel_mode Channel mode ch_mode 0b0 Mono 0 0b10 Stereo 1 0b1100 3.0 2 0b1101 5.0 3 0b1110 5.1 4 0b1111000 7.0: 3/4/0 (L,C,R,Ls,Rs,Lrs,Rr... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.3 b_4_back_channels_present | When the back channels (Lb, Rb) are present in the bitstream as signalled by Table 79, this fixed length field signals whether those channels are present in the original content or only contain encoded silence as shown in Table 80. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 137 Table 80: b_4_back_channels_present b_4_back... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.4 b_centre_present | When centre channel C is present in the bitstream as signalled by Table 79, this fixed length field signals whether it actually is present in the original content or contains encoded silence as shown in Table 81. Table 81: b_centre_present b_centre_present Original content Encoded AC-4 bitstream 0 Original content does... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.5 top_channels_present | When the top channels (Tfl, Tbl, Tfr, Tbr) are present in the bitstream as signalled by Table 79, this fixed length field signals, as shown in Table 82, whether all of those channels are present in the original content, whether the original content has only two top channels (Tl, Tr) and how they are carried, or whether... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.7.6 b_audio_ndot | This flag indicates whether an audio substream can be decoded independently of preceding frames. 6.3.2.8 ac4_substream_info_ajoc - AC-4 substream information for object based substreams using A-JOC |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.8.1 b_lfe | This flag indicates whether a LFE is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.8.2 b_static_dmx | This flag indicates whether a static downmix is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.8.3 n_fullband_dmx_signals_minus1 | The n_fullband_dmx_signals_minus1 element indicates the number of fullband downmix signals minus 1. To get the number of fullband downmix signals, n_fullband_dmx_signals, a value of 1 needs to be added to n_fullband_dmx_signals_minus1. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.8.4 b_oamd_common_data_present | This flag indicates whether OAMD common data is present. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 138 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.8.5 n_fullband_upmix_signals_minus1 | The n_fullband_upmix_signals_minus1 element indicates the number of fullband upmix signals minus 1. To get the number of fullband upmix signals, n_fullband_upmix_signals, a value of 1 needs to be added to n_fullband_upmix_signals_minus1. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9 bed_dyn_obj_assignment - Bed and dynamic object assignment | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.1 b_dyn_objects_only | This flag indicates whether only dynamic objects are present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.2 b_isf | This flag indicates whether one or more ISF objects are present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.3 isf_config | The isf_config field indicates the intermediate spatial format of the objects in the substream group. The isf_config field shall be interpreted according to Table 83. The intermediate spatial format objects are ordered as presented in the table. Table 83: isf_config isf_config objects present in the ISF (in M.U.L.Z lay... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.4 b_ch_assign_code | The b_ch_assign_code flag indicates whether the channel assignment is defined by bed_chan_assign_code. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.5 bed_chan_assign_code | The bed_chan_assign_code describes bed object channel configuration, number of channels and channel order according to Table 84. Table 84: bed_chan_assign_code bed_chan_assign_code channels channel configuration description number of channels 0b000 L/R 2.0.0 2 0b001 L/R/C 3.0.0 3 0b010 L/R/C/LFE/Ls/Rs 5.1.0 6 0b011 L/R... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.6 b_chan_assign_mask | The b_chan_assign_mask flag indicates whether the channel assignment is defined by a channel assignment mask. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 139 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.7 b_nonstd_bed_channel_assignment | The b_nonstd_channel_assignment flag indicates whether the channel assignment is defined by nonstd_bed_channel_assignment_mask. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.8 nonstd_bed_channel_assignment_mask | The nonstd_bed_channel_assignment_mask is a bitmask that describes the channel assignment whenever the channel assignment is non-standard, i.e. when some channels do not appear as part of channel pairs. For example, when the R channel is present but the corresponding L channel is not. Each bit in the field represents a... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.9 std_bed_channel_assignment_mask | The presence or absence of bed object channels can be flagged in the field std_bed_channel_assignment_mask. Each bit in the field represents a different channel or channel pair present in the bitstream according to Table 86. If the corresponding bit is set to 1 then the channel(s) exist(s); if the corresponding bit is ... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.10 n_bed_signals_minus1 | The n_bed_signals_minus1 element indicates the number of bed signals minus 1. To get the number of bed signals, n_bed_signals, a value of 1 needs to be added to n_bed_signals_minus1. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.9.11 nonstd_bed_channel_assignment | The channel assignment is given via the nonstd_bed_channel_assignment value according to Table 85. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 140 6.3.2.10 ac4_substream_info_obj - AC-4 substream information for object based substreams |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.1 n_objects_code | The n_objects_code element describes the number of fullband signals in the substreams according to Table 87. Table 87: n_objects_code n_objects_code n_objects (Number of objects) 0 0 1 1 2 2 3 3 4 5 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.2 b_dynamic_objects | The b_dynamic_objects flag indicates whether the substream contains dynamic objects. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.3 b_lfe | For b_dynamic_objects=1, this flag indicates whether a LFE is present. For b_dynamic_objects=0, the presence of a LFE is signalled by bed_chan_assign_code, nonstd_bed_channel_assignment_mask, or std_bed_channel_assignment_mask. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.4 b_bed_objects | The b_bed_objects flag indicates whether the substream contains bed objects. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.5 b_bed_start | The b_bed_start flag indicates whether the substream contains the channel information for the bed according to Table 88. Consecutive substreams are ordered according to their channel assignments. If one LFE exists, it is part of the first substream. If two LFE channels exist, one of them is in the first substream, the ... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.6 b_isf_start | The b_isf_start flag indicates whether the substream is the first or a singular ISF substream and contains ISF config information. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.7 res_bytes | This element specifies the size of the reserved_data element in bytes. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.10.8 reserved_data | The reserved_data element holds additional data and is reserved for future use. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.11 ac4_presentation_substream_info - Presentation substream information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.11.1 b_alternative | This bit indicates whether an alternative presentation is present. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 141 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.11.2 b_pres_ndot | This bit indicates whether a presentation substream can be decoded independently from preceding frames. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.12 oamd_substream_info - Object audio metadata substream information | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.2.12.1 b_oamd_ndot | This flag indicates whether an OAMD substream can be decoded independently from preceding frames. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3 AC-4 substreams | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1 ac4_presentation_substream - AC-4 presentation substream | |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.1 b_name_present | This flag indicates whether a presentation name is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.2 b_length | The length of the presentation_name field is 32 bytes if b_length = 0, or transmitted as name_len otherwise. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.3 name_len | The name_len element indicates the length of the presentation name element in bytes. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.4 presentation_name | The presentation_name element indicates the name of the presentation as a string using UTF-8 coding (ISO/IEC 10646 [2]). The decoder shall read an array byte with name_len elements out of presentation_name, where each element has the length of one byte. If byte[name_len-1] = 0, the name of the presentation is given by ... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.5 n_targets_minus1 | The n_targets_minus1 element indicates the number of presentation targets minus 1. To get the number of presentation targets, n_targets, a value of 1 needs to be added to n_targets_minus1. The result of additional variable_bits is added to n_targets, if n_targets = 4. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.6 target_level | The target_level element indicates the decoder compatibility for a target like the mdcompat element indicates the decoder compatibility for a presentation. See Table 78. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.7 target_device_category | The target_device_category element indicates the device categories of the target as a bit mask according to Table 89. Table 89: target_device_category target_device_category (incl. tdc_extension) Description 0b1xxxx stereo speaker (1D) 0bx1xxx 5.1 (2D) 0bxx1xx Including height (3D) 0bxxx1x Portable 0bxxxx11xxx, 0bxxxx1... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.8 tdc_extension | The tdc_extension element is used as an extension of the target_device_category element. See Table 89. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.9 b_ducking_depth_present | This flag indicates whether a max_ducking_depth element is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.10 max_ducking_depth | The max_ducking_depth element indicates the maximum ducking depth according to Table 90. Table 90: max_ducking_depth max_ducking_depth Maximum ducking depth [dB] 0...62 -1 × max_ducking_depth 63 -∞ |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.11 b_loud_corr_target | This flag indicates whether a loud_corr_target element is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.12 loud_corr_target | The loud_corr_target element indicates a loudness correction factor for a presentation target. target_corr_gain = 15$−$loud_corr_target /2dB A value of 31 is reserved, and if present indicates a gain of 0 dB. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.13 n_substreams_in_presentation | This helper variable indicates the number of audio substreams (incl. e.g. Dialogue Enhancement substreams) in a presentation. The order of the substreams is defined by the order of appearance in ac4_substream_group_info() (inner loop) and appearance of ac4_sgi_specifier() in ac4_presentation_v1_info() (outer loop). |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.14 b_active | This flag indicates whether substream sus is active for target t. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.15 alt_data_set_index | The alt_data_set_index element, together with a possible extension via variable_bits(), indicates which of the alternative object audio metadata sets in the loop over n_alt_data_sets in oamd_dyndata_single() is used for the objects in the substream. A value of 0 indicates that no alternative data set is used and a valu... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.16 b_additional_data | This flag indicates whether additional data is present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.17 add_data_bytes_minus1 | The add_data_bytes_minus1 element indicates the number of additional data bytes minus 1. To get the number of additional data bytes, add_data_bytes, a value of 1 needs to be added to add_data_bytes_minus1. The result of additional variable_bits() is added to add_data_bytes if add_data_bytes = 16. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.18 add_data | The add_data element holds additional data and is reserved for future use. ETSI ETSI TS 103 190-2 V1.1.1 (2015-09) 143 |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.19 drc_metadata_size_value | This value indicates the DRC metadata size, i.e. the size of the drc_frame() element, in bits. NOTE: If b_more_bits is set, the DRC metadata size is increased by variable_bits. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.20 b_more_bits | This bit indicates whether additional variable_bits are used to determine the DRC metadata size. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.21 drc_frame | The drc_frame element is present as specified in ETSI TS 103 190-1 [1], clause 4.2.14.5. The possible values for nr_drc_channels specified in ETSI TS 103 190-1 [1], clause 4.3.13.7.1 shall be extended by the values shown in Table 91 for the immersive and 22.2 channel configurations. Table 91: nr_drc_channels for higher... |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.22 b_substream_group_gains_present | This flag indicates whether gain values for the substream groups are present. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.23 b_keep | This flag indicates whether to use the same substream group gains as in the previous AC-4 frame. If the b_keep flag is not set, new substream group gains are present in the bitstream. Until the first reception of an AC-4 frame with b_keep = 0, a value of 0 dB shall be used as substream group gain. |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.24 sg_gain | The sg_gain element indicates the substream group gain for the substream group sg according to Table 92. The substream group gain is applied to all substreams in the substream group sg. Table 92: sg_gain sg_gain Substream group gain [dB] 0...62 -0,25 × sg_gain 63 -∞ |
9cc71134e4c63574779a8d3d5ef00858 | 103 190-2 | 6.3.3.1.25 b_associated | This flag indicates whether associated audio mixing metadata is present. |
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