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ISO/IEC JTC 1/SC 29
Date:
ISO/IEC 14496-3:/Amd.1:1999(E)
ISO/IEC JTC 1/SC 29/WG 11
Secretariat:
Information technology – Coding of audio-visual objects – Part 3: Audio
Document type: International Standard
Document subtype: Amendment
Document stage: (60) Publication
Document language: E
–
II
Contents
1 Scope ..................................................................................................................................................... 2
1.1 Overview of MPEG-4 Audio Amd 1......................................................................................................2
1.2 New Concepts in MPEG-4 Audio Amd 1.............................................................................................2
1.3 MPEG-4 Audio Amd 1 Capabilities......................................................................................................4
1.3.1 Overview of capabilities.......................................................................................................................4
1.3.2 Error robustness...................................................................................................................................5
1.3.3 Low delay...............................................................................................................................................6
1.3.4 Back channel.........................................................................................................................................6
1.3.5 Fine granule Audio ...............................................................................................................................6
1.3.6 HILN : Harmonic and Individual Lines plus Noise (parametric audio coding) ...............................6
1.3.7 Silence compression for CELP............................................................................................................6
1.3.8 Extension of HVXC ...............................................................................................................................7
2 Normative references ........................................................................................................................... 7
3 Terms and definitions...........................................................................................................................7
4 Symbols and abbreviations ................................................................................................................. 7
5 Technical overview...............................................................................................................................7
5.1 Extended MPEG-4 Audio Object Types .............................................................................................. 7
5.1.1 Audio Object Type Definition ..............................................................................................................7
5.1.2 Description ............................................................................................................................................ 9
5.2 Audio Profiles and Levels..................................................................................................................11
5.2.1 Profiles................................................................................................................................................. 11
5.2.2 Complexity units.................................................................................................................................11
5.2.3 Level within the Profiles.....................................................................................................................12
6 Extension to interface to MPEG-4 System ....................................................................................... 13
6.1 Introduction.........................................................................................................................................13
6.2 Extension to Syntax............................................................................................................................13
6.2.1 Audio DecoderSpecificInfo................................................................................................................13
6.2.2 Payloads .............................................................................................................................................. 15
6.3 Semantics............................................................................................................................................15
III
6.3.1 AudioObjectType................................................................................................................................ 15
6.3.2 SamplingFrequency ........................................................................................................................... 15
6.3.3 SamplingFrequencyIndex.................................................................................................................. 15
6.3.4 channelConfiguration......................................................................................................................... 15
6.3.5 epToolUsed ......................................................................................................................................... 15
6.3.6 GASpecificConfig ............................................................................................................................... 15
6.4 Back channel....................................................................................................................................... 15
6.4.1 Introduction......................................................................................................................................... 15
6.4.2 Syntax .................................................................................................................................................. 16
6.4.3 General information............................................................................................................................ 16
6.5 MPEG-4 Audio Transport Stream...................................................................................................... 17
7 Parametric audio coding (HILN)........................................................................................................ 17
7.1 Overview of the tools ......................................................................................................................... 17
7.2 Terms and definitions ........................................................................................................................ 18
7.3 Bitstream syntax................................................................................................................................. 18
7.3.1 Decoder configuration (ParametricSpecificConfig)........................................................................ 18
7.3.2 Bitstream Frame (alPduPayload) ...................................................................................................... 21
7.4 Bitstream semantics........................................................................................................................... 35
7.4.1 Decoder Configuration (ParametricSpecificConfig) ....................................................................... 35
7.4.2 Bitstream Frame (alPduPayload) ...................................................................................................... 35
7.5 Parametric decoder tools................................................................................................................... 36
7.5.1 HILN decoder tools............................................................................................................................. 36
7.5.2 Integrated parametric coder .............................................................................................................. 52
8 Extension to General Audio Coding ................................................................................................. 53
8.1 Decoder Configuration (GASpecificConfig).....................................................................................53
8.1.1 Syntax .................................................................................................................................................. 53
8.1.2 Semantics............................................................................................................................................ 54
8.2 Fine Granule Audio............................................................................................................................. 54
8.2.1 Overview of tools................................................................................................................................ 54
8.2.2 bitstream syntax ................................................................................................................................. 54
8.2.3 General information............................................................................................................................ 59
8.2.4 Tool Descriptions ............................................................................................................................... 80
IV
8.3 Low delay coding mode .....................................................................................................................99
8.3.1 Introduction.........................................................................................................................................99
8.3.2 Syntax ................................................................................................................................................ 101
8.3.3 General information..........................................................................................................................103
8.3.4 Coder description ............................................................................................................................. 103
8.4 AAC Error resilience.........................................................................................................................107
8.4.1 Overview of tools..............................................................................................................................107
8.4.2 Bitstream payload.............................................................................................................................108
8.4.3 Tool descriptions..............................................................................................................................111
9 Error protection.................................................................................................................................124
9.1 Overview of the tools........................................................................................................................124
9.2 Syntax ................................................................................................................................................ 126
9.2.1 Error protection Specific Configuration......................................................................................... 126
9.2.2 Error protection bitstream payloads...............................................................................................126
9.3 General information..........................................................................................................................128
9.3.1 Definitions ......................................................................................................................................... 128
9.4 Tool description................................................................................................................................130
9.4.1 Out of band information................................................................................................................... 130
9.4.2 In band information .......................................................................................................................... 131
9.4.3 Concatenation functionality ............................................................................................................132
9.4.4 Cyclic Redundancy Code.................................................................................................................132
9.4.5 Systematic Rate-Compatible Punctured Convolutional (SRCPC) codes....................................133
9.4.6 Shortened Reed-Solomon Codes.................................................................................................... 141
10 Error resilience bitstream reordering .............................................................................................144
10.1 Overview of the tools........................................................................................................................144
10.2 CELP................................................................................................................................................... 144
10.2.1 Syntax ................................................................................................................................................ 145
10.2.2 General information..........................................................................................................................152
10.2.3 Tool description................................................................................................................................152
10.3 HVXC ..................................................................................................................................................152
10.3.1 Syntax ................................................................................................................................................ 152
10.3.2 General information..........................................................................................................................167
V
10.3.3 Tool description................................................................................................................................ 167
10.4 TwinVQ............................................................................................................................................... 167
10.4.1 Syntax ................................................................................................................................................ 167
10.4.2 General information.......................................................................................................................... 171
10.4.3 Tool description................................................................................................................................ 171
10.5 AAC .................................................................................................................................................... 171
10.5.1 Syntax ................................................................................................................................................ 171
10.5.2 General Information.......................................................................................................................... 172
10.5.3 Tool Description ............................................................................................................................... 173
10.5.4 Tables................................................................................................................................................. 174
10.5.5 Figures............................................................................................................................................... 176
11 Silence Compression Tool............................................................................................................... 176
11.1 Overview of the silence compression tool..................................................................................... 176
11.2 Definitions ......................................................................................................................................... 177
11.3 Specifications of the silence compression tool ............................................................................ 177
11.3.1 Transmission Payload...................................................................................................................... 177
11.3.2 Bitrates of the silence compression tool ....................................................................................... 178
11.3.3 Algorithmic delay of the silence compression tool ...................................................................... 178
11.4 Syntax ................................................................................................................................................ 178
11.4.1 Bitstream syntax............................................................................................................................... 179
11.4.2 Bitstream semantics......................................................................................................................... 181
11.5 CNG module...................................................................................................................................... 182
11.5.1 Definitions ......................................................................................................................................... 182
11.5.2 LSP decoder...................................................................................................................................... 183
11.5.3 LSP smoother.................................................................................................................................... 183
11.5.4 LSP interpolation and LSP-LPC conversion.................................................................................. 184
11.5.5 RMS Decoder..................................................................................................................................... 184
11.5.6 RMS Smoother .................................................................................................................................. 184
11.5.7 CNG excitation generation............................................................................................................... 184
11.5.8 LP Synthesis filter............................................................................................................................. 186
11.5.9 Memory update ................................................................................................................................. 186
12 Extension of HVXC variable rate mode .......................................................................................... 187
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