对USB audio 上位机Mute设备协议的解析

21 01 00 01 02 02 01 00

01

21:type

01: req

00 01 :  value (00 channel 01 contrl)

02 02 : index (first02 interface 02 unit)


A.17.7 Feature Unit Control Selectors
Table A-23: Feature Unit Control Selectors
Control Selector
Value
FU_CONTROL_UNDEFINED
0x00
FU_MUTE_CONTROL0x01FU_VOLUME_CONTROL0x02FU_BASS_CONTROL0x03FU_MID_CONTROL0x04FU_TREBLE_CONTROL0x05FU_GRAPHIC_EQUALIZER_CONTROL0x06FU_AUTOMATIC_GAIN_CONTROL0x07FU_DELAY_CONTROL0x08FU_BASS_BOOST_CONTROL0x09FU_LOUDNESS_CONTROL0x0AFU_INPUT_GAIN_CONTROL0x0BFU_INPUT_GAIN_PAD_CONTROL0x0CFU_PHASE_INVERTER_CONTROL0x0DFU_UNDERFLOW_CONTROL0x0EUSB Device Class Definition for Audio DevicesRelease 2.0May 31, 2006 138Control Selector ValueFU_OVERFLOW_CONTROL0x0FFU_LATENCY_CONTROL0x10

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