实例介绍
【实例简介】
USB Audio20 Spec 文档。
【实例截图】
【核心代码】
Table of Contents Scope of This Release............................................................................................................. 2 Contributors ............................................................................................................................. 2 Revision History....................................................................................................................... 2 Table of Contents..................................................................................................................... 6 List of Tables ............................................................................................................................ 9 List of Figures ........................................................................................................................ 12 1 Introduction..................................................................................................................... 13 1.1 Scope......................................................................................................................... 13 1.2 Purpose ..................................................................................................................... 13 1.3 Related Documents ................................................................................................... 13 1.4 Terms and Abbreviations........................................................................................... 13 2 Management Overview................................................................................................... 16 2.1 Overview of Key Differences between ADC v1.0 and v2.0....................................... 16 3 Functional Characteristics............................................................................................. 18 3.1 Introduction................................................................................................................ 18 3.2 Audio Interface Collection (AIC) ................................................................................ 19 3.3 Audio Function Class................................................................................................. 19 3.4 Audio Function Subclass........................................................................................... 19 3.5 Audio Function Protocol ............................................................................................ 19 3.6 Audio Interface Class ................................................................................................ 20 3.7 Audio Interface Subclass........................................................................................... 20 3.8 Audio Interface Protocol ............................................................................................ 20 3.9 Audio Function Category........................................................................................... 20 3.10 Clock Domains....................................................................................................... 21 3.11 Audio Synchronization Types ................................................................................ 21 3.11.1 Asynchronous ................................................................................................. 21 3.11.2 Synchronous................................................................................................... 21 3.11.3 Adaptive.......................................................................................................... 21 3.12 Inter Channel Synchronization............................................................................... 21 3.13 Audio Function Topology ....................................................................................... 22 3.13.1 Audio Channel Cluster.................................................................................... 25 3.13.2 Input Terminal................................................................................................. 27 3.13.3 Output Terminal .............................................................................................. 28 3.13.4 Mixer Unit........................................................................................................ 29 3.13.5 Selector Unit ................................................................................................... 29 3.13.6 Feature Unit .................................................................................................... 30 3.13.7 Sampling Rate Converter Unit........................................................................ 30 3.13.8 Effect Unit ....................................................................................................... 31 3.13.9 Processing Unit............................................................................................... 34 3.13.10 Extension Unit................................................................................................. 35 USB Device Class Definition for Audio Devices Release 2.0 May 31, 2006 7 3.13.11 Clock Entities .................................................................................................. 36 3.14 Encoders and Decoders ........................................................................................ 37 3.15 Copy Protection ..................................................................................................... 38 3.16 Operational Model.................................................................................................. 38 3.16.1 AudioControl Interface.................................................................................... 39 3.16.2 AudioStreaming Interface ............................................................................... 39 3.16.3 Clock Model .................................................................................................... 41 3.16.4 Binding between Physical Buttons and Audio Controls ................................. 41 4 Descriptors...................................................................................................................... 43 4.1 Audio Channel Cluster Descriptor............................................................................. 43 4.2 Device Descriptor ...................................................................................................... 45 4.3 Device_Qualifier Descriptor....................................................................................... 45 4.4 Configuration Descriptor............................................................................................ 46 4.5 Other_Speed_Configuration Descriptor .................................................................... 46 4.6 Interface Association Descriptor................................................................................ 46 4.7 AudioControl Interface Descriptors ........................................................................... 47 4.7.1 Standard AC Interface Descriptor ...................................................................... 47 4.7.2 Class-Specific AC Interface Descriptor.............................................................. 48 4.8 AudioControl Endpoint Descriptors ........................................................................... 73 4.8.1 AC Control Endpoint Descriptors ....................................................................... 74 4.8.2 AC Interrupt Endpoint Descriptors ..................................................................... 74 4.9 AudioStreaming Interface Descriptors....................................................................... 75 4.9.1 Standard AS Interface Descriptor ...................................................................... 75 4.9.2 Class-Specific AS Interface Descriptor .............................................................. 75 4.9.3 Class-Specific AS Format Type Descriptor........................................................ 77 4.9.4 Class-Specific AS Encoder Descriptor............................................................... 77 4.9.5 Class-Specific AS Decoder Descriptor .............................................................. 78 4.10 AudioStreaming Endpoint Descriptors................................................................... 85 4.10.1 AS Isochronous Audio Data Endpoint Descriptors......................................... 85 4.10.2 AS Isochronous Feedback Endpoint Descriptor............................................. 87 5 Requests.......................................................................................................................... 89 5.1 Standard Requests.................................................................................................... 89 5.2 Class-Specific Requests............................................................................................ 89 5.2.1 Control Attributes................................................................................................ 89 5.2.2 Control Request Layout...................................................................................... 90 5.2.3 Control Request Parameter Block Layout.......................................................... 91 5.2.4 Common Controls .............................................................................................. 94 5.2.5 AudioControl Requests ...................................................................................... 97 5.2.6 AudioStreaming Requests ............................................................................... 116 5.2.7 Additional Requests ......................................................................................... 127 6 Interrupts ....................................................................................................................... 129 6.1 Interrupt Data Message........................................................................................... 129 6.2 Interrupt Sources ..................................................................................................... 130 USB Device Class Definition for Audio Devices Release 2.0 May 31, 2006 8 Appendix A. Audio Device Class Codes..................................................................... 131 A.1 Audio Function Class Code..................................................................................... 131 A.2 Audio Function Subclass Codes .............................................................................131 A.3 Audio Function Protocol Codes............................................................................... 131 A.4 Audio Interface Class Code..................................................................................... 131 A.5 Audio Interface Subclass Codes ............................................................................. 131 A.6 Audio Interface Protocol Codes............................................................................... 132 A.7 Audio Function Category Codes .............................................................................132 A.8 Audio Class-Specific Descriptor Types ................................................................... 132 A.9 Audio Class-Specific AC Interface Descriptor Subtypes......................................... 133 A.10 Audio Class-Specific AS Interface Descriptor Subtypes ..................................... 133 A.11 Effect Unit Effect Types ....................................................................................... 134 A.12 Processing Unit Process Types........................................................................... 134 A.13 Audio Class-Specific Endpoint Descriptor Subtypes........................................... 134 A.14 Audio Class-Specific Request Codes.................................................................. 134 A.15 Encoder Type Codes ........................................................................................... 135 A.16 Decoder Type Codes ........................................................................................... 135 A.17 Control Selector Codes........................................................................................ 135 A.17.1 Clock Source Control Selectors.................................................................... 135 A.17.2 Clock Selector Control Selectors.................................................................. 136 A.17.3 Clock Multiplier Control Selectors................................................................. 136 A.17.4 Terminal Control Selectors ........................................................................... 136 A.17.5 Mixer Control Selectors ................................................................................ 136 A.17.6 Selector Control Selectors............................................................................ 137 A.17.7 Feature Unit Control Selectors ..................................................................... 137 A.17.8 Effect Unit Control Selectors ........................................................................ 138 A.17.9 Processing Unit Control Selectors................................................................ 140 A.17.10 Extension Unit Control Selectors.................................................................. 141 A.17.11 AudioStreaming Interface Control Selectors ................................................ 141 A.17.12 Encoder Control Selectors............................................................................ 142 A.17.13 Decoder Control Selectors ........................................................................... 142 A.17.14 Endpoint Control Selectors........................................................................... 144
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