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Building Audio Accessories | Android Open Source Project
https://source.android.com/devices/accessories/audio
Provided by Android Open Accessory (AOA) 2.0 and provides limited audio capability, as described in Connecting custom audio over USB. Host. Enables the Android device to drive the USB bus and operate with a wide range of USB-based peripherals, including audio interfaces. Devices that implement host mode will be compatible with USB headsets that follow the USB …
Amazon.com: android audio interface
https://www.amazon.com/android-audio-interface/s?k=android+audio+interface
How to enable USB "Audio Source" option on Android 9 ...
https://android.stackexchange.com/questions/225334/how-to-enable-usb-audio-source-option-on-android-9
However Android devices support audio peripherals in host mode (kernel must be built with CONFIG_SND_USB_AUDIO). Since AOA is specific to Android, such accessories aren't usable with other hosts like PCs. So there was a demand from audio peripheral manufacturers, device OEMs and ROM developers community to support standard USB audio out capability in host mode …
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