Bluetooth A2DP Spec v1.2

16 April 2007
Contents
1 Introduction ...................................................................................................................................... 8
1.1 Scope ......................................................................................................................................... 8
1.2 Profile Dependency ................................................................................................................... 8
1.3 Symbols and Conventions ......................................................................................................... 9
1.3.1 Requirement Status Symbols ............................................................................................. 9
1.3.2 Definition ........................................................................................................................... 10
2 Profile Overview ............................................................................................................................. 11
2.1 Profile Stacks ........................................................................................................................... 11
2.2 Configurations and Roles ........................................................................................................ 11
2.3 User Requirements and Scenarios ......................................................................................... 12
2.4 Profile Fundamentals ............................................................................................................... 12
2.5 Conformance ........................................................................................................................... 13
3 Application Layer ............................................................................................................................ 14
3.1 Audio Streaming Set Up .......................................................................................................... 14
3.2 Audio Streaming ...................................................................................................................... 14
3.2.1 Send Audio Stream ........................................................................................................... 15
3.2.2 Receive Audio Stream ...................................................................................................... 15
4 Audio Codec Interoperability Requirements .................................................................................. 17
4.1 Overview .................................................................................................................................. 17
4.2 Support of Codecs ................................................................................................................... 17
4.2.1 Mandatory Codec .............................................................................................................. 17
4.2.2 Optional codecs ................................................................................................................ 18
4.2.3 Non-A2DP Codecs ............................................................................................................ 18
4.2.4 Codec Interoperability Requirements ................................................................................ 18
4.2.5 Audio Codec Type Field Values ........................................................................................ 18
4.3 SBC ......................................................................................................................................... 18
4.3.1 Reference .......................................................................................................................... 18
4.3.2 Codec Specific Information Elements ............................................................................... 18
4.3.3 Media Packet Header Requirements ................................................................................ 21
4.3.4 Media Payload Format ...................................................................................................... 21
4.4 MPEG-1,2 Audio ...................................................................................................................... 23
4.4.1 Reference .......................................................................................................................... 23
4.4.2 Codec Specific Information Elements ............................................................................... 23
4.4.3 Media Packet Header Requirements ................................................................................ 26
4.4.4 Media Payload Format ...................................................................................................... 26
4.5 MPEG-2, 4 AAC ...................................................................................................................... 26
4.5.1 Reference .......................................................................................................................... 26
4.5.2 Codec Specific Information Elements ............................................................................... 26
4.5.3 Media Packet Header Requirements ................................................................................ 29
4.5.4 Media Payload Format ...................................................................................................... 29
4.6 ATRAC family .......................................................................................................................... 29
4.6.1 Reference .......................................................................................................................... 29
4.6.2 Codec Specific Information Elements ............................................................................... 29
4.6.3 Media Packet Header Requirements ................................................................................ 32
4.6.4 Media Payload Format ...................................................................................................... 33
4.7 Non-A2DP Codec .................................................................................................................... 33
4.7.1 Reference .......................................................................................................................... 33
4.7.2 Codec Specific Information Elements ............................................................................... 33
4.7.3 Media Packet Header Requirements ................................................................................ 34
4.7.4 Media Payload Format ...................................................................................................... 34
5 GAVDP Interoperability Requirements .......................................................................................... 35
5.1 AVDTP Interoperability Requirements .................................................................................... 35
5.1.1 Signaling procedures ........................................................................................................ 35BLUETOOTH SPECIFICATIONPage 7 of 73
Advanced Audio Distribution Profile (A2DP)
16 April 2007
5.1.2 Transport Services ............................................................................................................ 35
5.1.3 Error Codes ....................................................................................................................... 35
5.2 L2CAP Interoperability Requirements ..................................................................................... 37
5.2.1 Maximum Transmission Unit ............................................................................................. 38
5.3 SDP Interoperability Requirements ......................................................................................... 38
5.4 Link Manager Interoperability Requirements ........................................................................... 40
5.5 Link Controller Interoperability Requirements ......................................................................... 40
5.5.1 Class of Device ................................................................................................................. 40
6 Generic Access Profile Interoperability Requirements .................................................................. 42
7 Testing ........................................................................................................................................... 43
8 References ..................................................................................................................................... 44
9 List of Figures ................................................................................................................................. 45
10 List of Tables .................................................................................................................................. 46
11 Appendix A (Informative): Audio Streaming with Content Protection ............................................ 47
12 Appendix B: Technical Specification of SBC ................................................................................. 48
12.1 Introduction .............................................................................................................................. 48
12.2 Glossary ................................................................................................................................... 48
12.3 Symbols and Abbreviations ..................................................................................................... 48
12.3.1 Arithmetic Operators ......................................................................................................... 48
12.3.2 Logical Operators .............................................................................................................. 49
12.3.3 Relation Operators ............................................................................................................ 49
12.3.4 Bitwise Operators .............................................................................................................. 49
12.3.5 Assignment ....................................................................................................................... 49
12.3.6 Mnemonics ........................................................................................................................ 49
12.3.7 Constants .......................................................................................................................... 50
12.3.8 Ranges .............................................................................................................................. 50
12.3.9 Number Notation ............................................................................................................... 50
12.4 Syntax ...................................................................................................................................... 50
12.5 Semantics ................................................................................................................................ 52
12.5.1 Frame_header ................................................................................................................... 52
12.5.2 scale_factors ..................................................................................................................... 53
12.5.3 audio_samples .................................................................................................................. 53
12.5.4 padding ............................................................................................................................. 53
12.6 Decoding Processes ................................................................................................................ 53
12.6.1 Frame Header ................................................................................................................... 54
12.6.2 Scale Factors .................................................................................................................... 54
12.6.3 Bit Allocation ..................................................................................................................... 55
12.6.4 Reconstruction of the Subband Samples ......................................................................... 62
12.6.5 Joint Processing ................................................................................................................ 62
12.6.6 Synthesis Filter .................................................................................................................. 62
12.7 Encoding Processes ................................................................................................................ 64
12.7.1 Analysis Filter .................................................................................................................... 65
12.7.2 Scale Factors .................................................................................................................... 66
12.7.3 Joint_Stereo Channel Mode Operation............................................................................. 66
12.7.4 Bit Allocation ..................................................................................................................... 67
12.7.5 Quantization ...................................................................................................................... 67
12.8 Tables ...................................................................................................................................... 67
12.9 Calculation of Bit Rate and Frame Length .............................................................................. 68
13 Appendix C (Informative): Signaling Flows .................................................................................... 69
13.1 Audio Streaming Set Up .......................................................................................................... 69
13.2 Audio Streaming ...................................................................................................................... 70
14 Appendix D: Acronyms and Abbreviations..................................................................................... 72
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