1、 ETSI TS 103 420 V1.1.1 (2016-07) Backwards-compatible object audio carriage using Enhanced AC-3 floppy3TECHNICAL SPECIFICATION ETSI ETSI TS 103 420 V1.1.1 (2016-07)2 Reference DTS/JTC-035 Keywords audio, broadcasting, coding, digital ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRAN
2、CE 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-search The present document may be mad
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5、d other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced
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7、nd to reproduction in all media. European Telecommunications Standards Institute 2016. European Broadcasting Union 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registe
8、red for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 420 V1.1.1 (2016-07)3 Contents Intellectual Property Rights 7g3Foreword . 7g3Modal verbs terminology 7g3Introduction 7g31 Sco
9、pe 9g32 References 9g32.1 Normative references . 9g32.2 Informative references 10g33 Definitions, symbols, abbreviations and conventions 10g33.1 Definitions 10g33.2 Symbols 11g33.3 Abbreviations . 11g33.4 Conventions 12g34 Object-based audio . 12g34.1 Introduction 12g34.2 Coordinate systems. 12g34.2
10、.1 Room-anchored coordinate system . 12g34.2.2 Screen-anchored coordinate system 13g34.2.3 Speaker-anchored system . 14g34.3 Decoding of object-based audio content 14g34.4 Decoder interface . 15g35 Object audio metadata 16g35.1 Introduction 16g35.2 Object properties 17g35.2.1 Position . 17g35.2.1.1
11、Introduction . 17g35.2.1.2 Position in room-anchored coordinates . 17g35.2.1.3 Position in screen-anchored coordinates . 18g35.2.1.4 Position in speaker-anchored coordinates . 19g35.2.2 Size . 19g35.2.3 Priority 19g35.2.4 Gain 20g35.2.5 Channel lock . 20g35.2.6 Zone constraints 20g35.3 Property upda
12、te information . 21g35.3.1 Introduction. 21g35.3.2 Timing of property updates . 21g35.4 Object audio metadata structure . 23g35.5 Bitstream syntax . 25g35.5.1 variable_bits_max . 25g35.5.2 object_audio_metadata_payload . 26g35.5.3 program_assignment . 27g35.5.4 oa_element_md . 27g35.5.5 object_eleme
13、nt 28g35.5.6 md_update_info 28g35.5.7 block_update_info 28g35.5.8 object_data 28g35.5.9 object_info_block . 29g35.5.10 object_basic_info 29g35.5.11 object_render_info 30g35.6 Bitstream description 31g35.6.1 Object properties . 31g35.6.1.1 Position . 31g3ETSI ETSI TS 103 420 V1.1.1 (2016-07)4 5.6.1.1
14、.1 b_default_screen_size_ratio 31g35.6.1.1.2 ref_screen_ratio_bits . 31g35.6.1.1.3 b_standard_chan_assign 31g35.6.1.1.4 bed_channel_assignment_mask . 31g35.6.1.1.5 nonstd_bed_channel_assignment_mask 32g35.6.1.1.6 b_lfe_only 32g35.6.1.1.7 b_differential_position_specified 32g35.6.1.1.8 pos3D_X_bits 3
15、3g35.6.1.1.9 pos3D_Y_bits 33g35.6.1.1.10 pos3D_Z_sign_bits 33g35.6.1.1.11 pos3D_Z_bits 33g35.6.1.1.12 diff_pos3D_X_bits 33g35.6.1.1.13 diff_pos3D_Y_bits 34g35.6.1.1.14 diff_pos3D_Z_bits . 34g35.6.1.1.15 b_object_distance_specified 34g35.6.1.1.16 b_object_at_infinity . 34g35.6.1.1.17 distance_factor_
16、idx 34g35.6.1.1.18 b_object_use_screen_ref . 35g35.6.1.1.19 screen_factor_bits 35g35.6.1.1.20 depth_factor_idx 35g35.6.1.2 Size 35g35.6.1.2.1 object_size_idx 35g35.6.1.2.2 object_size_bits . 36g35.6.1.2.3 object_width_bits 36g35.6.1.2.4 object_depth_bits. 36g35.6.1.2.5 object_height_bits 36g35.6.1.3
17、 Priority 36g35.6.1.3.1 b_default_object_priority 36g35.6.1.3.2 object_priority_bits 37g35.6.1.4 Gain . 37g35.6.1.4.1 object_gain_idx . 37g35.6.1.4.2 object_gain_bits . 37g35.6.1.5 Channel lock . 37g35.6.1.5.1 b_object_snap 37g35.6.1.6 Zone constraints 37g35.6.1.6.1 zone_constraints_idx . 37g35.6.1.
18、6.2 b_enable_elevation 38g35.6.2 Timing metadata . 38g35.6.2.1 sample_offset_code . 38g35.6.2.2 sample_offset_idx . 38g35.6.2.3 sample_offset_bits 38g35.6.2.4 num_obj_info_blocks_bits 39g35.6.2.5 block_offset_factor_bits 39g35.6.2.6 ramp_duration_code 39g35.6.2.7 b_use_ramp_duration_idx . 39g35.6.2.
19、8 ramp_duration_idx 39g35.6.2.9 ramp_duration_bits . 40g35.6.3 Object audio metadata content description . 40g35.6.3.1 b_dyn_object_only_program 40g35.6.3.2 b_lfe_present . 40g35.6.3.3 content_description_mask . 40g35.6.3.4 b_bed_object_chan_distribute . 40g35.6.3.5 b_multiple_bed_instances_present
20、40g35.6.3.6 num_bed_instances_bits . 40g35.6.3.7 intermediate_spatial_format_idx . 41g35.6.3.8 num_dynamic_objects_bits . 41g35.6.4 Additional metadata 41g35.6.4.1 oa_md_version_bits 41g35.6.4.2 object_count_bits 41g35.6.4.3 b_alternate_object_data_present . 41g35.6.4.4 oa_element_count_bits 42g35.6
21、.4.5 reserved_data_size_bits. 42g3ETSI ETSI TS 103 420 V1.1.1 (2016-07)5 5.6.4.6 oa_element_id_idx 42g35.6.4.7 oa_element_size_bits 42g35.6.4.8 alternate_object_data_id_idx 42g35.6.4.9 b_discard_unknown_element 43g35.6.4.10 b_object_not_active 43g35.6.4.11 object_basic_info_status_idx 43g35.6.4.12 b
22、_object_in_bed_or_ISF . 43g35.6.4.13 object_render_info_status_idx 44g35.6.4.14 b_additional_table_data_exists . 44g35.6.4.15 additional_table_data_size_bits 44g35.6.4.16 obj_basic_info_mask. 44g35.6.4.17 obj_render_info_mask . 45g35.6.4.18 padding 45g36 Joint object coding . 45g36.1 Introduction 45
23、g36.2 Bitstream syntax . 45g36.2.1 joc . 45g36.2.2 joc_header . 46g36.2.3 joc_info . 46g36.2.4 joc_data_point_info 46g36.2.5 joc_data . 46g36.3 Bitstream description 47g36.3.1 joc . 47g36.3.1.1 joc overview 47g36.3.2 joc_header . 47g36.3.2.1 joc_header overview . 47g36.3.2.2 joc_dmx_config_idx . 47g
24、36.3.2.3 joc_num_channels . 47g36.3.2.4 joc_num_objects_bits 48g36.3.2.5 joc_ext_config_idx 48g36.3.3 joc_info . 48g36.3.3.1 joc_info overview . 48g36.3.3.2 joc_clipgain_x_bits, joc_clipgain_y_bits 48g36.3.3.3 joc_seq_count_bits 48g36.3.3.4 b_joc_object_present. 48g36.3.3.5 joc_num_bands_idx 48g36.3
25、.3.6 b_joc_sparse 49g36.3.3.7 joc_num_quant_idx . 49g36.3.4 joc_data_point_info 49g36.3.4.1 joc_data_point_info overview . 49g36.3.4.2 joc_slope_idx 49g36.3.4.3 joc_num_dpoints_bits . 50g36.3.4.4 joc_offset_ts_bits 50g36.3.5 joc_data . 50g36.3.5.1 joc_data overview . 50g36.3.5.2 joc_channel_idx 50g3
26、6.3.5.3 joc_hcw . 50g36.4 Joint object coding decoder interfaces 50g36.4.1 Input 50g36.4.2 Output . 51g36.4.3 Control 51g36.5 Parameter band mapping 51g36.6 Joint object coding decoder 52g36.6.1 Introduction. 52g36.6.2 Differential decoding of side information . 52g36.6.3 Huffman decoding of side in
27、formation . 53g36.6.4 Dequantization of side information 54g36.6.5 Temporal interpolation of side information 55g36.6.6 Reconstruction of the output objects . 56g37 Quadrature mirror filter bank domain processing 56g3ETSI ETSI TS 103 420 V1.1.1 (2016-07)6 7.1 Introduction 56g37.2 Complex analysis pr
28、ocessing . 56g37.3 Complex synthesis processing 57g37.4 Filter bank coefficients . 58g38 Enhanced AC-3 decoding . 59g38.1 Requirements on enhanced AC-3 decoding . 59g38.2 Requirements on EMDF container . 59g3Annex A (normative): Tables 60g3A.1 JOC Huffman code tables. 60g3A.2 Speaker Zones 61g3Annex
29、 B (informative): Conversion to ADM format 62g3B.1 Introduction 62g3B.2 Object properties 63g3B.2.1 Position . 63g3B.2.1.1 Introduction. 63g3B.2.1.2 Room related position metadata 63g3B.2.1.3 Screen related position metadata 63g3B.2.1.4 Speaker-related position metadata 64g3B.2.2 Size . 66g3B.2.3 Pr
30、iority 66g3B.2.4 Gain 66g3B.2.5 Channel lock . 66g3B.2.6 Zone constraints . 66g3B.3 Timing metadata . 67g3History 68g3ETSI ETSI TS 103 420 V1.1.1 (2016-07)7 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pe
31、rtaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secr
32、etariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates
33、on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC
34、) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memo
35、randum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and prog
36、ramme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 The symbolic source code for tables reference
37、d throughout the present document is contained in archive ts_103420v010101p0.zip which accompanies the present document. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as de
38、scribed in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Motivation In traditional channel-based audio mixing, sound elements are mixed to the fixed s
39、peaker channels, i.e. left, right, centre, left surround and right surround. This paradigm is well known and works when the channel configuration at the decoding end can be predetermined, or assumed with reasonable certainty to be 2.0, 5.X, or 7.X. However, with the popularity of new speaker setups,
40、 no assumption can be made about the speaker setup used for playback. Therefore, channel-based audio does not offer a sufficient method for adapting a presentation where the source speaker layout does not match the speaker layout at the decoding end. This presents a challenge when trying to author c
41、ontent that plays back well independently to the speaker configuration. ETSI ETSI TS 103 420 V1.1.1 (2016-07)8 In object-based audio, individual sound elements are delivered to the playback device, where they are rendered based on the used speaker layout. Because individual sound elements can be ass
42、ociated with a much richer set of metadata, giving meaning to the elements, the method of adaptation to the speaker configuration reproducing the audio can provide better information regarding how to render to fewer speakers. Enhanced AC-3 (E-AC-3), defined in ETSI TS 102 366 1, is a widely used for
43、mat for transmission of channel-based audio content. When the goal is to transport object-based audio in an environment where compatibility with pre-existing devices is paramount, joint object coding (JOC), as specified in the present document, can be used in conjunction with E-AC-3. Document struct
44、ure The present document is structured as follows: Clause 4 explains the concept of object-based audio and specifies the decoder interface. Clause 5 specifies object audio metadata (OAMD), the object-based audio metadata format. Annex B specifies how OAMD can be converted to an audio definition mode
45、l (ADM), providing an interconnection to the professional metadata generation and monitoring. Clause 6 specifies the JOC tool that converts the output of an E-AC-3 decoder to objects, as specified in ETSI TS 102 366 1. Clause 7 specifies the quadrature mirror filter bank (QMF) tool that is used by t
46、he JOC tool. ETSI ETSI TS 103 420 V1.1.1 (2016-07)9 1 Scope The present document specifies an extension to the E-AC-3 codec. The extension adds an object-based three-dimensional spatial representation of coded audio information and metadata. It is backward compatible with the one- and two-dimensiona
47、l channel-based spatial representation of coded audio information as defined in ETSI TS 102 366 1. NOTE: In this context, backward compatibility is defined as follows: The three-dimensional spatial representation specified in the present document can be decoded on a device compliant with the syntax
48、and semantics specified in ETSI TS 102 366 1. In this case, such a device will output one- or two-dimensional channel-based audio as per the coding algorithm defined in ETSI TS 102 366 1 alone. Thus, support for decoders specified in ETSI TS 102 366 1 and associated user experiences are fully mainta
49、ined with the extension defined herein. The present document specifies the following: 1) Syntax and semantics of the object-based audio metadata, carried via the extensible metadata delivery format (EMDF), specified in ETSI TS 102 366 1. 2) Syntax and semantics of metadata to control a tool for conversion of one- or two-dimensional channel-based audio to a higher number of audio signals, part of the three-dimensional spatial representation (JOC). 3) Additional requirements on the E-AC-3 decoder as specified in ETSI TS 102 366 1. 4) Requirements o
