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TECHNICAL SPECIFICATION
Backwards-compatible object audio carriage
using Enhanced AC-3
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2 ETSI TS 103 420 V1.2.1 (2018-10)
Reference
RTS/JTC-042
Keywords
audio, broadcasting, coding, digital
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3 ETSI TS 103 420 V1.2.1 (2018-10)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 8
Introduction . 9
Motivation . 9
Document structure . 9
1 Scope . 10
2 References . 10
2.1 Normative References . 10
2.2 Informative References . 11
3 Definitions of terms, symbols, abbreviations and conventions . 11
3.1 Terms . 11
3.2 Symbols . 12
3.3 Abbreviations . 13
3.4 Conventions . 13
4 Object-based audio . 14
4.1 Introduction . 14
4.2 Coordinate systems. 14
4.2.1 Room-anchored coordinate system . 14
4.2.2 Screen-anchored coordinate system . 15
4.2.3 Speaker-anchored system . 15
4.3 Decoding of object-based audio content . 15
4.4 Decoder interface . 16
5 Object audio metadata . 18
5.1 Introduction . 18
5.1a OBA content description . 18
5.2 Object properties . 18
5.2.1 Position . 18
5.2.1.1 Introduction . 18
5.2.1.2 Position in room-anchored coordinates . 19
5.2.1.3 Position in screen-anchored coordinates . 20
5.2.1.4 Position in speaker-anchored coordinates . 20
5.2.2 Size . 21
5.2.3 Priority . 21
5.2.4 Gain . 22
5.2.5 Channel lock . 22
5.2.6 Zone constraints . 22
5.2.7 Object Divergence . 23
5.2.8 Object Trim . 23
5.3 Property update information . 24
5.3.1 Introduction. 24
5.3.2 Timing of property updates . 24
5.4 Object audio metadata structure . 25
5.5 Bitstream syntax . 27
5.5.1 variable_bits_max . 27
5.5.2 object_audio_metadata_payload . 28
5.5.3 program_assignment . 28
5.5.4 oa_element_md . 29
5.5.5 object_element . 29
5.5.6 md_update_info . 29
5.5.7 block_update_info . 30
5.5.8 object_data . 30
5.5.9 object_info_block . 31
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4 ETSI TS 103 420 V1.2.1 (2018-10)
5.5.10 object_basic_info . 31
5.5.11 object_render_info . 32
5.5.12 trim_element . 33
5.5.13 extended_object_element . 34
5.5.14 obj_div_block . 34
5.5.15 ext_prec_pos_block . 34
5.6 Bitstream description . 35
5.6.0 Object audio metadata content description . 35
5.6.0.1 oa_md_version_bits . 35
5.6.0.2 object_count_bits . 35
5.6.0.3 b_alternate_object_data_present . 35
5.6.0.4 oa_element_count_bits . 35
5.6.0.5 b_dyn_object_only_program . 35
5.6.0.6 b_lfe_present . 35
5.6.0.7 content_description[]. 35
5.6.0.8 b_bed_chan_distribute . 36
5.6.0.9 b_multiple_bed_instances_present . 36
5.6.0.10 num_bed_instances_bits . 36
5.6.0.11 intermediate_spatial_format_idx . 36
5.6.0.12 num_dynamic_objects_bits . 37
5.6.1 Audio object properties . 37
5.6.1.1 Position . 37
5.6.1.1.1 Void . 37
5.6.1.1.2 Void . 37
5.6.1.1.3 b_standard_chan_assign . 37
5.6.1.1.4 bed_channel_assignment[] . 37
5.6.1.1.5 nonstd_bed_channel_assignment[] . 37
5.6.1.1.6 b_lfe_only . 38
5.6.1.1.7 b_differential_position_specified . 38
5.6.1.1.8 pos3D_X_bits . 38
5.6.1.1.9 pos3D_Y_bits . 39
5.6.1.1.10 pos3D_Z_sign_bits . 39
5.6.1.1.11 pos3D_Z_bits . 39
5.6.1.1.12 diff_pos3D_X_bits . 39
5.6.1.1.13 diff_pos3D_Y_bits . 39
5.6.1.1.14 diff_pos3D_Z_bits . 40
5.6.1.1.15 b_object_distance_specified . 40
5.6.1.1.16 b_object_at_infinity . 40
5.6.1.1.17 distance_factor_idx . 40
5.6.1.1.18 b_object_use_screen_ref . 41
5.6.1.1.19 screen_factor_bits . 41
5.6.1.1.20 depth_factor_idx . 41
5.6.1.2 Size . 41
5.6.1.2.1 object_size_idx . 41
5.6.1.2.2 object_size_bits . 41
5.6.1.2.3 object_width_bits . 42
5.6.1.2.4 object_depth_bits . 42
5.6.1.2.5 object_height_bits. 42
5.6.1.3 Priority . 42
5.6.1.3.1 b_default_object_priority . 42
5.6.1.3.2 object_priority_bits . 42
5.6.1.4 Gain . 42
5.6.1.4.1 object_gain_idx . 42
5.6.1.4.2 object_gain_bits . 43
5.6.1.5 Channel lock . 43
5.6.1.5.1 b_object_snap . 43
5.6.1.6 Zone constraints . 43
5.6.1.6.1 zone_constraints_idx . 43
5.6.1.6.2 b_enable_elevation . 43
5.6.2 Timing metadata . 44
5.6.2.1 sample_offset_code . 44
5.6.2.2 sample_offset_idx . 44
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5 ETSI TS 103 420 V1.2.1 (2018-10)
5.6.2.3 sample_offset_bits . 44
5.6.2.4 num_obj_info_blocks_bits . 44
5.6.2.5 block_offset_factor_bits . 44
5.6.2.6 ramp_duration_code . 45
5.6.2.7 b_use_ramp_duration_idx . 45
5.6.2.8 ramp_duration_idx . 45
5.6.2.9 ramp_duration_bits . 45
5.6.3 Void . 45
5.6.4 Additional metadata . 45
5.6.4.1 reserved_data_size_bits . 45
5.6.4.2 oa_element_id_idx . 46
5.6.4.3 oa_element_size_bits . 46
5.6.4.4 alternate_object_data_id_idx . 46
5.6.4.5 b_discard_unknown_element . 47
5.6.4.6 b_object_not_active . 47
5.6.4.7 object_basic_info_status_idx . 47
5.6.4.8 b_object_in_bed_or_ISF . 47
5.6.4.9 object_render_info_status_idx . 47
5.6.4.10 b_additional_table_data_exists . 48
5.6.4.11 additional_table_data_size_bits . 48
5.6.4.12 obj_basic_info[] . 48
5.6.4.13 obj_render_info[] . 48
5.6.4.14 padding . 49
5.6.5 Trim . 49
5.6.5.1 warp_mode . 49
5.6.5.2 global_trim_mode . 49
5.6.5.3 b_default_trim . 49
5.6.5.4 b_disable_trim . 50
5.6.5.5 trim_balance_presence[] . 50
5.6.5.6 trim_centre . 50
5.6.5.7 trim_surround . 50
5.6.5.8 trim_height . 51
5.6.5.9 bal3D_Y_sign_tb_code . 51
5.6.5.10 bal3D_Y_amount_tb . 51
5.6.5.11 bal3D_Y_sign_lis_code . 52
5.6.5.12 bal3D_Y_amount_lis . 52
5.6.6 extended_object_element . 52
5.6.6.1 b_obj_div_block . 52
5.6.6.2 b_ext_prec_pos_block . 52
5.6.6.3 obj _div_block . 52
5.6.6.3.1 b_object_divergence . 52
5.6.6.3.2 object_div_mode . 52
5.6.6.3.3 object_div_table . 52
5.6.6.3.4 object_div_code . 53
5.6.6.4 ext_prec_pos_block. 53
5.6.6.4.1 b_ext_prec_pos . 53
5.6.6.4.2 ext_prec_pos_presence[] . 53
5.6.6.4.3 ext_prec_pos3D_X . 54
5.6.6.4.4 ext_prec_pos3D_Y . 54
5.6.6.4.5 ext_prec_pos3D_Z . 54
6 Joint object coding . 54
6.1 Introduction . 54
6.2 Bitstream syntax . 55
6.2.1 joc . 55
6.2.2 joc_header .
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