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USB Interface Association Descriptor - Windows drivers ...
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-interface-association-descriptor
USB Audio Class Specification (Class Code - 0x01) USB Bluetooth Class Specification (Class Code - 0xE0) Windows 7, Windows Server 2008, Windows Vista, Microsoft Windows Server 2003 Service Pack 1 (SP1), and Microsoft Windows XP Service Pack 2 (SP2) support IADs. The following subsections describe information about how to use IADs.
Defined Class Codes | USB-IF
https://www.usb.org/defined-class-codes
Base Class 01h (Audio) This base class is defined for Audio capable devices that conform to the Audio Device Class Specification found on the USB-IF website. That specification defines the usable set of SubClass and Protocol values. Values outside of that defined spec are reserved. These class codes may only be used in Interface Descriptors.
USB audio Device to Host volume control - Stack Overflow
https://stackoverflow.com/questions/70800715/usb-audio-device-to-host-volume-control
I used example code from X-CUBE-USB-AUDIO package to stream audio to\from PC. Everything seems to work fine. Now I want to modify the code to allow USB device to notify the host of volume/mute changes. According to USB audio specification 1.0 p.30, an optional Status Interrupt Endpoint can be used for this purpose.
USB Audio Device using PIC18F4550 | Microchip
https://www.microchip.com/forums/m231496-p4.aspx
bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 40 bInCollection 1 baInterfaceNr( 0) 1
FT90x USB Audio Device - FTDI
https://www.ftdichip.com/Support/Documents/AppNotes/AN_433_FT90x-USB-Audio-Device.pdf
audio data to a DAC. The audio stream is sent via I2S and the DAC is normally controlled via I2C. The USB device interface may be configured to report a USB Audio Device and receive a suitable audio stream from a host PC. This can be received by the FT900 and subsequently streamed to the DAC. There is a large choice of suitable DACs available.
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