USB Audio Device Class Definition for Basic Audio Functions
Release 3.0-Errata April 05, 2019 4
TABLE OF CONTENTS
Scope of This Release ................................................................................................................................................ 2
Contributors............................................................................................................................................................... 2
Revision History ......................................................................................................................................................... 2
Table of Contents ...................................................................................................................................................... 4
List of Tables .............................................................................................................................................................. 6
List of Figures ............................................................................................................................................................. 7
1 Introduction ....................................................................................................................................................... 8
1.1 Scope ......................................................................................................................................................... 8
1.2 Purpose ...................................................................................................................................................... 8
1.3 Related Documents ................................................................................................................................... 8
1.4 Terms and Abbreviations ........................................................................................................................... 8
2 Management Overview ................................................................................................................................... 10
3 Classification .................................................................................................................................................... 11
4 General Requirements ..................................................................................................................................... 13
4.1 Host and Basic Audio Device Interoperability.......................................................................................... 13
4.2 BADD AudioStreaming Interfaces ............................................................................................................ 13
4.2.1 USB Speeds ...................................................................................................................................... 13
4.2.2 Burst Modes ..................................................................................................................................... 13
4.2.3 Synchronization Type ....................................................................................................................... 13
4.2.4 Sampling Frequency & Bit Depth ..................................................................................................... 13
4.2.5 Cluster Descriptors........................................................................................................................... 14
4.3 Power Considerations .............................................................................................................................. 15
4.3.1 Power Domains ................................................................................................................................ 15
5 Topologies ....................................................................................................................................................... 16
5.1 BAOF Topology ........................................................................................................................................ 16
5.2 BAIF Topology .......................................................................................................................................... 16
5.3 BAIOF Topology ....................................................................................................................................... 17
6 Descriptors ....................................................................................................................................................... 19
6.1 Standard Descriptors ............................................................................................................................... 19
6.2 Interface Descriptors ............................................................................................................................... 19
6.2.1 Interface Association Descriptor ...................................................................................................... 19
6.2.2 AudioControl Interface Descriptors ................................................................................................. 20
6.2.3 AudioControl Endpoint Descriptors ................................................................................................. 27
6.2.4 AudioStreaming Interface Descriptors ............................................................................................ 27
6.3 String Descriptors .................................................................................................................................... 31
7 Requests .......................................................................................................................................................... 32
