Development mode
USB audio is not supported in development mode.
Host mode
Android 5.0 (API level 21) and above supports a subset of USB audio class 1 (UAC1) features:
The Android device must act as host
The audio format must be PCM (interface type I)
The bit depth must be 16-bits, 24-bits, or 32-bits where 24 bits of useful audio data are left-justified within the most significant bits of the 32-bit word
The sample rate must be either 48, 44.1, 32, 24, 22.05, 16, 12, 11.025, or 8 kHz
The channel count must be 1 (mono) or 2 (stereo)
Perusal of the Android framework source code may show additional code beyond the minimum needed to support these features. But this code has not been validated, so more advanced features are not yet claimed.
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