UniversalSerialBusDeviceClassDefinitionforAudioDataFormats

USB

Audio

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Universal Serial Bus

Device Class Definition

for

Audio Data Formats

Release 1.0

March 18, 1998

USB Device Class Definition for Audio Data Formats

Release 1.0 March 18, 1998 iv

Table of Contents

Scope of This Release.........................................................................................................ii

Contributors.........................................................................................................................ii

Revision History ..................................................................................................................ii

Table of Contents...............................................................................................................iv

List of Tables.......................................................................................................................v

1 Introduction..................................................................................................................6

1.1 Related Documents .................................................................................................6

1.2 Terms and Abbreviations.........................................................................................6

2 Audio Data Formats......................................................................................................8

2.1 Transfer Delimiter....................................................................................................8

2.2 Type I Formats ........................................................................................................8

2.2.1 USB Packets ....................................................................................................8

2.2.2 Audio Subframe................................................................................................9

2.2.3 Audio Frame.....................................................................................................9

2.2.4 Audio Streams..................................................................................................9

2.2.5 Type I Format Type Descriptor .......................................................................10

2.2.6 Supported Formats .........................................................................................11

2.3 Type II Formats .....................................................................................................12

2.3.1 Encoded Audio Frames...................................................................................12

2.3.2 Audio Bitstreams.............................................................................................12

2.3.3 USB Packets ..................................................................................................13

2.3.4 Bandwidth Allocation.......................................................................................13

2.3.5 Timing ............................................................................................................13

2.3.6 Type II Format Type Descriptor ......................................................................13

2.3.7 Rate feedback ................................................................................................15

2.3.8 Supported Formats .........................................................................................15

2.4 Type III Formats ....................................................................................................26

2.4.1 Type III Format Type Descriptor .....................................................................26

3 Adding New Audio Data Formats ..............................................................................28

Appendix A. Additional Audio Device Class Codes .....................................................29

A.1 Audio Data Format Codes......................................................................................29

A.1.1 Audio Data Format Type I Codes....................................................................29

A.1.2 Audio Data Format Type II Codes...................................................................29

A.1.3 Audio Data Format Type III Codes..................................................................29

A.2 Format Type Codes...............................................................................................30

A.1 Format-Specific Control Selectors .........................................................................30

A.3...................................................................................................................................30

A.3.1 MPEG Control Selectors.................................................................................30

A.3.2 AC-3 Control Selectors ...................................................................................30

USB Device Class Definition for Audio Data Formats

Release 1.0 March 18, 1998 v

List of Tables

Table 2-1: Type I Format Type Descriptor........................................................................10

Table 2-2: Continuous Sampling Frequency ...................................................................10

Table 2-3: Discrete Number of Sampling Frequencies....................................................11

Table 2-4: Type II Format Type Descriptor.......................................................................13

Table 2-5: Continuous Sampling Frequency ...................................................................14

Table 2-6: Discrete Number of Sampling Frequencies....................................................14

Table 2-7: MPEG Format-Specific Descriptor ..................................................................16

Table 2-8: Set MPEG Control Request Values.................................................................18

Table 2-9: Get MPEG Control Request Values.................................................................18

Table 2-10: Dual Channel Control Parameter Block........................................................19

Table 2-11: Second Stereo Control Parameter Block......................................................19

Table 2-12: Multilingual Control Parameter Block...........................................................20

Table 2-13: Dynamic Range Control Parameter Block ....................................................20

Table 2-14: Scaling Control Parameter Block..................................................................21

Table 2-15: High/Low Scaling Control Parameter Block.................................................21

Table 2-16: AC-3 Format-Specific Descriptor...................................................................22

Table 2-17: Set AC-3 Control Request Values..................................................................23

Table 2-18: Get AC-3 Control Request Values.................................................................23

Table 2-19: Mode Control Parameter Block .....................................................................24

Table 2-20: Dynamic Range Control Parameter Block ....................................................24

Table 2-21: Scaling Control Parameter Block..................................................................25

Table 2-22: High/Low Scaling Control Parameter Block.................................................25

Table 2-23: Type III Format Type Descriptor....................................................................26

Table 2-24: Continuous Sampling Frequency .................................................................27

Table 2-25: Discrete Number of Sampling Frequencies..................................................27

Table A-1: Audio Data Format Type I Codes....................................................................29

Table A-2: Audio Data Format Type II Codes...................................................................29

Table A-3: Audio Data Format Type III Codes..................................................................29

Table A-4: Format Type Codes.........................................................................................30

Table A-5: MPEG Control Selectors .................................................................................30

Table A-6: AC-3 Control Selectors....................................................................................30

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