Bluetooth A2DP Spec v1.2

bbc007

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 SPECIFICATION  Page 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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