/*
* Copyright (c) 2022, sakumisu
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef USB_AUDIO_H
#define USB_AUDIO_H
/** Audio Interface Subclass Codes
* Refer to Table A-2 from audio10.pdf
*/
#define AUDIO_SUBCLASS_UNDEFINED 0x00
#define AUDIO_SUBCLASS_AUDIOCONTROL 0x01
#define AUDIO_SUBCLASS_AUDIOSTREAMING 0x02
#define AUDIO_SUBCLASS_MIDISTREAMING 0x03
#define AUDIO_PROTOCOL_UNDEFINED 0x00
#define AUDIO_PROTOCOLv20 0x20 /* IP version 2.0 */
/** Audio Class-Specific Request Codes
* Refer to Table A-9 from audio10.pdf
*/
#define AUDIO_REQUEST_UNDEFINED 0x00
#define AUDIO_REQUEST_SET_CUR 0x01
#define AUDIO_REQUEST_GET_CUR 0x81
#define AUDIO_REQUEST_SET_MIN 0x02
#define AUDIO_REQUEST_GET_MIN 0x82
#define AUDIO_REQUEST_SET_MAX 0x03
#define AUDIO_REQUEST_GET_MAX 0x83
#define AUDIO_REQUEST_SET_RES 0x04
#define AUDIO_REQUEST_GET_RES 0x84
#define AUDIO_REQUEST_SET_MEM 0x05
#define AUDIO_REQUEST_GET_MEM 0x85
#define AUDIO_REQUEST_GET_STAT 0xFF
/** Audio Class-Specific Request Codes
* Refer from audio20_final.pdf
*/
#define AUDIO_REQUEST_CUR 0x01
#define AUDIO_REQUEST_RANGE 0x02
/** Audio Class-Specific Control Interface Descriptor Subtypes
* Refer to Table A-5 from audio10.pdf
*/
#define AUDIO_CONTROL_UNDEF 0x01U
#define AUDIO_CONTROL_HEADER 0x01U
#define AUDIO_CONTROL_INPUT_TERMINAL 0x02U
#define AUDIO_CONTROL_OUTPUT_TERMINAL 0x03U
#define AUDIO_CONTROL_MIXER_UNIT 0x04U
#define AUDIO_CONTROL_SELECTOR_UNIT 0x05U
#define AUDIO_CONTROL_FEATURE_UNIT 0x06U
#define AUDIO_CONTROL_EFFECT_UNIT 0x07U
#define AUDIO_CONTROL_PROCESSING_UNIT 0x08U
#define AUDIO_CONTROL_EXTENSION_UNIT 0x09U
#define AUDIO_CONTROL_CLOCK_SOURCE 0x0aU
#define AUDIO_CONTROL_CLOCK_SELECTOR 0x0bU
#define AUDIO_CONTROL_CLOCK_MULTIPLIER 0x0cU
#define AUDIO_CONTROL_SAMPLERATE_CONVERTER 0x0dU
/** Audio Class-Specific AS Interface Descriptor Subtypes
* Refer to Table A-6 from audio10.pdf
*/
#define AUDIO_STREAMING_UNDEFINED 0x00U
#define AUDIO_STREAMING_GENERAL 0x01U
#define AUDIO_STREAMING_FORMAT_TYPE 0x02U
#define AUDIO_STREAMING_ENCODER 0x03U
#define AUDIO_STREAMING_DECODER 0x04U
/* Clock Source Descriptor Clock Types */
#define AUDIO_CLKSRC_EXTERNAL 0x00 /* External clock */
#define AUDIO_CLKSRC_INTERNAL_FIXED 0x01 /* Internal fixed clock */
#define AUDIO_CLKSRC_INTERNAL_VAR 0x02 /* Internal variable clock */
#define AUDIO_CLKSRC_INTERNAL_PROG 0x03 /* Internal programmable clock */
/* Effect Unit Effect Types */
#define AUDIO_EFFECT_UNDEF 0x00
#define AUDIO_EFFECT_PARAM_EQ_SECTION 0x01
#define AUDIO_EFFECT_REVERBERATION 0x02
#define AUDIO_EFFECT_MOD_DELAY 0x03
#define AUDIO_EFFECT_DYN_RANGE_COMP 0x04
/* Processing Unit Process Types */
#define AUDIO_PROCESS_UNDEFINED 0x00
#define AUDIO_PROCESS_UPDOWNMIX 0x01
#define AUDIO_PROCESS_DOLBY_PROLOGIC 0x02
#define AUDIO_PROCESS_STEREO_EXTENDER 0x03
/* Audio Class-Specific Endpoint Descriptor Subtypes */
#define AUDIO_ENDPOINT_UNDEFINED 0x00U
#define AUDIO_ENDPOINT_GENERAL 0x01U
/* Feature Unit Control Bits */
#define AUDIO_CONTROL_MUTE 0x0001
#define AUDIO_CONTROL_VOLUME 0x0002
#define AUDIO_CONTROL_BASS 0x0004
#define AUDIO_CONTROL_MID 0x0008
#define AUDIO_CONTROL_TREBLE 0x0010
#define AUDIO_CONTROL_GRAPHIC_EQUALIZER 0x0020
#define AUDIO_CONTROL_AUTOMATIC_GAIN 0x0040
#define AUDIO_CONTROL_DEALY 0x0080
#define AUDIO_CONTROL_BASS_BOOST 0x0100
#define AUDIO_CONTROL_LOUDNESS 0x0200
/* Encoder Type Codes */
#define AUDIO_ENCODER_UNDEF 0x00
#define AUDIO_ENCODER_OTHER 0x01
#define AUDIO_ENCODER_MPEG 0x02
#define AUDIO_ENCODER_AC3 0x03
#define AUDIO_ENCODER_WMA 0x04
#define AUDIO_ENCODER_DTS 0x05
/* Decoder Type Codes */
#define AUDIO_DECODER_UNDEF 0x00
#define AUDIO_DECODER_OTHER 0x01
#define AUDIO_DECODER_MPEG 0x02
#define AUDIO_DECODER_AC3 0x03
#define AUDIO_DECODER_WMA 0x04
#define AUDIO_DECODER_DTS 0x05
/* Audio Descriptor Types */
#define AUDIO_UNDEFINED_DESCRIPTOR_TYPE 0x20
#define AUDIO_DEVICE_DESCRIPTOR_TYPE 0x21
#define AUDIO_CONFIGURATION_DESCRIPTOR_TYPE 0x22
#define AUDIO_STRING_DESCRIPTOR_TYPE 0x23
#define AUDIO_INTERFACE_DESCRIPTOR_TYPE 0x24
#define AUDIO_ENDPOINT_DESCRIPTOR_TYPE 0x25
/* Audio Data Format Type I Codes */
#define AUDIO_FORMAT_TYPE_I_UNDEFINED 0x0000
#define AUDIO_FORMAT_PCM 0x0001
#define AUDIO_FORMAT_PCM8 0x0002
#define AUDIO_FORMAT_IEEE_FLOAT 0x0003
#define AUDIO_FORMAT_ALAW 0x0004
#define AUDIO_FORMAT_MULAW 0x0005
#define AUDIO_V2_FORMAT_PCM 0x00000001
#define AUDIO_V2_FORMAT_PCM8 0x00000002
#define AUDIO_V2_FORMAT_IEEE_FLOAT 0x00000004
#define AUDIO_V2_FORMAT_ALAW 0x00000008
#define AUDIO_V2_FORMAT_MULAW 0x00000010
/* bmChannelConfig: a bitmap field that indicates which spatial locations
* are occupied by the channels present in the cluster. The bit allocations
* are as follows:
*/
#define AUDIO_CHANNEL_M 0 /* Mono */
#define AUDIO_CHANNEL_FL (1 << 0) /* Front Left */
#define AUDIO_CHANNEL_FR (1 << 1) /* Front Right */
#define AUDIO_CHANNEL_FC (1 << 2) /* Front Center */
#define AUDIO_CHANNEL_LFE (1 << 3) /* Low Frequency Effects */
#define AUDIO_CHANNEL_BL (1 << 4) /* Back Left */
#define AUDIO_CHANNEL_BR (1 << 5) /* Back Right */
#define AUDIO_CHANNEL_FLC (1 << 6) /* Front Left of Center */
#define AUDIO_CHANNEL_FRC (1 << 7) /* Front Right of Center */
#define AUDIO_CHANNEL_BC (1 << 8) /* Back Center */
#define AUDIO_CHANNEL_SL (1 << 9) /* Side Left */
#define AUDIO_CHANNEL_SR (1 << 10) /* Side Right */
#define AUDIO_CHANNEL_TC (1 << 11) /* Top Center */
#define AUDIO_CHANNEL_TFL (1 << 12) /* Top Front Left */
#define AUDIO_CHANNEL_TFC (1 << 13) /* Top Front Center */
#define AUDIO_CHANNEL_TFR (1 << 14) /* Top Front Right */
#define AUDIO_CHANNEL_TBL (1 << 15) /* Top Back Left */
#define AUDIO_CHANNEL_TBC (1 << 16) /* Top Back Center */
#define AUDIO_CHANNEL_TBR (1 << 17) /* Top Back Right */
#define AUDIO_CHANNEL_TFLC (1 << 18) /* Top Front Left of Center */
#define AUDIO_CHANNEL_TFRC (1 << 19) /* Top Front Right of Center */
#define AUDIO_CHANNEL_LLFE (1 << 20) /* Left Low Frequency Effects */
#define AUDIO_CHANNEL_RLFE (1 << 21) /* Right Low Frequency Effects */
#define AUDIO_CHANNEL_TSL (1 << 22) /* Top Side Left */
#define AUDIO_CHANNEL_TSR (1 << 23) /* Top Side Right */
#define AUDIO_CHANNEL_BOC (1 << 24) /* Bottom Center */
#define AUDIO_CHANNEL_BLC (1 << 25) /* Back Left of Center */
#define AUDIO_CHANNEL_BRC (1 << 26) /* Back Right of Center */
/* Bits 27-30: Reserved */
#define AUDIO_CHANNEL_RD (1 << 31) /* Raw Data */
/* Audio Function Category Codes */
#define AUDIO_CATEGORY_UNDEF 0x00 /* Undefined */
#define AUDIO_CATEGORY_SPEAKER 0x01 /* Desktop speaker */
#define AUDIO_CATEGORY_THEATER 0x02 /* Home theater */
#define AUDIO_CATEGORY_MICROPHONE 0x03 /* Microphone */
#define AUDIO_CATEGORY_HEADSET 0x04 /* Headset */
#define AUDIO_CATEGORY_TELEPHONE 0x05 /* Telephone */
#define AUDIO_CATEGORY_CONVERTER 0x06 /* Converter */
#define AUDIO_CATEGORY_RECORDER 0x07 /* Voice/Sound recorder */
#define AUDIO_CATEGORY_IO_BOX 0x08 /* I/O box */
#define AUDIO_CATEGORY_INSTRUMENT 0x09 /* Musical instrument */
#define AUDIO_CATEGORY_PROAUDIO 0x0a /* Pro-audio */
#define AUDIO_CATEGORY_AV 0x0b /* Audio/video */
#define AUDIO_CATEGORY_CONTROL 0x0c /* Control panel */
#define AUDIO_CATEGORY_OTHER 0xff
/* Clock Source Control Selectors */
#define AUDIO_CS_CONTROL_UNDEF 0x00
#define AUDIO_CS_CONTROL_SAM_FREQ 0x01
#define AUDIO_CS_CONTROL_CLOCK_VALID 0x02
/* Clock Selector Control Selectors */
#define AUDIO_CX_CONTROL_UNDEF 0x00
#define AUDIO_CX_CONTROL_CLOCKSEL 0x01
/* Clock Multiplier Control Selectors */
#define AUDIO_CM_CONTROL_UNDEF 0x00
#define AUDIO_CM_CONTROL_NUMERATOR 0x01
#define AUDIO_CM_CONTROL_DENOMINATOR 0x02
/* Terminal Control Selectors */
#define AUDIO_TE_CONTROL_UNDEF 0x00
#define AUDIO_TE_CONTROL_COPY_PROTECT 0x01
#define AUDIO_TE_CONTROL_CONNECTOR 0x02
#define AUDIO_TE_CONTROL_OVERLOAD 0x03
#define AUDIO_TE_CONTROL_CLUSTER 0x04
#define AUDIO_TE_CONTROL_UNDERFLOW 0x05
#define AUDIO_TE_CONTROL_OVERFLOW 0x06
#define AUDIO_TE_CONTROL_LATENCY 0x07
/* Mixer Control Selectors */
#define AUDIO_MU_CONTROL_UNDEF 0x00
#define AUDIO_MU_CONTROL_MIXER 0x01
#define AUDIO_MU_CONTROL_CLUSTER 0x02
#define AUDIO_MU_CONTROL_UNDERFLOW 0x03
#define AUDIO_MU_CONTROL_OVERFLOW 0x04
#define AUDIO_MU_CONTROL_LATENCY 0x05
/* Selector Control Selectors */
#define AUDIO_SU_CONTROL_UNDEFINE 0x00
#define AUDIO_SU_CONTROL_SELECTOR 0x01
#define AUDIO_SU_CONTROL_LATENCY 0x02
/* Feature Unit Control Selectors */
#define AUDIO_FU_CONTROL_UNDEF 0x00
#define AUDIO_FU_CONTROL_MUTE 0x01
#define AUDIO_FU_CONTROL_VOLUME 0x02
#define AUDIO_FU_CONTROL_BASS 0x03
#define AUDIO_FU_CONTROL_MID 0x04
#define AUDIO_FU_CONTROL_TREBLE 0x05
#define AUDIO_FU_CONTROL_EQUALIZER 0x06
#define AUDIO_FU_CONTROL_AGC 0x07
#define AUDIO_FU_CONTROL_DELAY 0x08
#define AUDIO_FU_CONTROL_BASS_BOOST 0x09
#define AUDIO_FU_CONTROL_LOUDNESS 0x0a
#define AUDIO_FU_CONTROL_INP_GAIN 0x0b
#define AUDIO_FU_CONTROL_INP_GAIN_PAD 0x0c
#define AUDIO_FU_CONTROL_PHASE_INVERT 0x0d
#define AUDIO_FU_CONTROL_UNDERFLOW 0x0e
#define AUDIO_FU_CONTROL_OVERFLOW 0x0f
#define AUDIO_FU_CONTROL_LATENCY 0x10
#define AUDIO_V2_FU_CONTROL_UNDEF 0x00
#define AUDIO_V2_FU_CONTROL_MUTE (0x03 << 0)
#define AUDIO_V2_FU_CONTROL_VOLUME (0x03 << 2)
#define AUDIO_V2_FU_CONTROL_BASS (0x03 << 4)
#define AUDIO_V2_FU_CONTROL_MID (0x03 << 6)
#define AUDIO_V2_FU_CONTROL_TREBLE (0x03 << 8)
#define AUDIO_V2_FU_CONTROL_EQUALIZER (0x03 << 10)
#define AUDIO_V2_FU_CONTROL_AGC (0x03 << 12)
#define AUDIO_V2_FU_CONTROL_DELAY (0x03 << 14)
#define AUDIO_V2_FU_CONTROL_BASS_BOOST (0x03 << 16)
#define AUDIO_V2_FU_CONTROL_LOUDNESS (0x03 << 18)
#define AUDIO_V2_FU_CONTROL_INP_GAIN (0x03 << 20)
#define AUDIO_V2_FU_CONTROL_INP_GAIN_PAD (0x03 << 22)
#define AUDIO_V2_FU_CONTROL_PHASE_INVERT (0x03 << 24)
#define AUDIO_V2_FU_CONTROL_UNDERFLOW (0x03 << 26)
#define AUDIO_V2_FU_CONTROL_OVERFLOW (0x03 << 28)
/* Parametric Equalizer Section Effect Unit Control Selectors */
#define AUDIO_PE_CONTROL_UNDEF 0x00
#define AUDIO_PE_CONTROL_ENABLE 0x01
#define AUDIO_PE_CONTROL_CENTERFREQ 0x02
#define AUDIO_PE_CONTROL_QFACTOR 0x03
#define AUDIO_PE_CONTROL_GAIN 0x04
#define AUDIO_PE_CONTROL_UNDERFLOW 0x05
#define AUDIO_PE_CONTROL_OVERFLOW 0x06
#define AUDIO_PE_CONTROL_LATENCY 0x07
/* Reverberation Effect Unit Control Selectors */
#define AUDIO_RV_CONTROL_UNDEF 0x00
#define AUDIO_RV_CONTROL_ENABLE 0x01
#define AUDIO_RV_CONTROL_TYPE 0x02
#define AUDIO_RV_CONTROL_LEVEL 0x03
#define AUDIO_RV_CONTROL_TIME 0x04
#define AUDIO_RV_CONTROL_FEEDBACK 0x05
#define AUDIO_RV_CONTROL_PREDELAY 0x06
#define AUDIO_RV_CONTROL_DENSITY 0x07
#define AUDIO_RV_CONTROL_HF_ROLLOFF 0x08
#define AUDIO_RV_CONTROL_UNDERFLOW 0x09
#define AUDIO_RV_CONTROL_OVERFLOW 0x0a
#define AUDIO_RV_CONTROL_LATENCY 0x0b
/* Modulation Delay Effect Unit Control Selectors */
#define AUDIO_MD_CONTROL_UNDEF 0x00
#define AUDIO_MD_CONTROL_ENABLE 0x01
#define AUDIO_MD_CONTROL_BALANCE 0x02
#define AUDIO_MD_CONTROL_RATE 0x03
#define AUDIO_MD_CONTROL_DEPTH 0x04
#define AUDIO_MD_CONTROL_TIME 0x05
#define AUDIO_MD_CONTROL_FEEDBACK 0x06
#define AUDIO_MD_CONTROL_UNDERFLOW 0x07
#define AUDIO_MD_CONTROL_OVERFLOW 0x08
#define AUDIO_MD_CONTROL_LATENCY 0x09
/* Dynamic Range Compressor Effect Unit Control Selectors */
#define AUDIO_DR_CONTROL_UNDEF 0x00
#define AUDIO_DR_CONTROL_ENABLE 0x01
#define AUDIO_DR_CONTROL_COMP_RATE 0x02
#define AUDIO_DR_CONTROL_MAXAMPL 0x03
#define AUDIO_DR_CONTROL_THRESHOLD 0x04
#define AUDIO_DR_CONTROL_ATTACK_TIME 0x05
#define AUDIO_DR_CONTROL_RELEASE_TIME 0x06
#define AUDIO_DR_CONTROL_UNDERFLOW 0x07
#define AUDIO_DR_CONTROL_OVERFLOW 0x08
#define AUDIO_DR_CONTROL_LATENCY 0x09
/* Up/Down-mix Processing Unit Control Selectors */
#define AUDIO_UD_CONTROL_UNDEF 0x00
#define AUDIO_UD_CONTROL_ENABLE 0x01
#define AUDIO_UD_CONTROL_MODE_SELECT 0x02
#define AUDIO_UD_CONTROL_CLUSTER 0x03
#define AUDIO_UD_CONTROL_UNDERFLOW 0x04
#define AUDIO_UD_CONTROL_OVERFLOW 0x05
#define AUDIO_UD_CONTROL_LATENCY 0x06
/* Dolby Prologic?Processing Unit Control Selectors */
#define AUDIO_DP_CONTROL_UNDEF 0x00
#define AUDIO_DP_CONTROL_ENABLE 0x01
#define AUDIO_DP_CONTROL_MODE_SELECT 0x02
#define AUDIO_DP_CONTROL_CLUSTER 0x03
#define AUDIO_DP_CONTROL_UNDERFLOW 0x04
#define AUDIO_DP_CONTROL_OVERFLOW 0x05
#define AUDIO_DP_CONTROL_LATENCY 0x06
/* Stereo Extender Processing Unit Control Selectors */
#define AUDIO_STEXT_CONTROL_UNDEF 0x00
#define AUDIO_STEXT_CONTROL_ENABLE 0x01
#define AUDIO_STEXT_CONTROL_WIDTH 0x02
#define AUDIO_STEXT_CONTROL_UNDERFLOW 0x03
#define AUDIO_STEXT_CONTROL_OVERFLOW 0x04
#define AUDIO_STEXT_CONTROL_LATENCY 0x05
/* Extension Unit Control Selectors */
#define AUDIO_XU_CONTROL_UNDEF 0x00
#define AUDIO_XU_CONTROL_ENABLE 0x01
#define AUDIO_XU_CONTROL_CLUSTER 0x02
#define AUDIO_XU_CONTROL_UNDERFLOW 0x03
#define AUDIO_XU_CONTROL_OVERFLOW 0x04
#define AUDIO_XU_CONTROL_LATENCY 0x05
/* AudioStreaming Interface Control Selectors */
#define AUDIO_AS_CONTROL_UNDEF 0x00
#define AUDIO_AS_CONTROL_ACT_ALT 0x01
#define AUDIO_AS_CONTROL_VAL_ALT 0x02
#define AUDIO_AS_CONTROL_AUDIO_FORMAT 0x03
/* Encoder Control Selectors */
#define AUDIO_EN_CONTROL_UNDEF 0x00
#define AUDIO_EN_CONTROL_BIT_RATE 0x01
#define AUDIO_EN_CONTROL_QUALITY 0x02
#define AUDIO_EN_CONTROL_VBR 0x03
#define AUDIO_EN_CONTROL_TYPE 0x04
#define AUDIO_EN_CONTROL_UNDERFLOW 0x05
#define AUDIO_EN_CONTROL_OVERFLOW 0x06
#define AUDIO_EN_CONTROL_ENCODER_ERR 0x07
#define AUDIO_EN_CONTROL_PARAM1 0x08
#define AUDIO_EN_CONTROL_PARAM2 0x09
#define AUDIO_EN_CONTROL_PARAM3 0x0a
#define AUDIO_EN_CONTROL_PARAM4 0x0b
#define AUDIO_EN_CONTROL_PARAM5 0x0c
#define AUDIO_EN_CONTROL_PARAM6 0x0d
#define AUDIO_EN_CONTROL_PARAM7 0x0e
#define AUDIO_EN_CONTROL_PARAM8 0x0f
/* MPEG Decoder Control Selectors */
#define AUDIO_MPGD_CONTROL_UNDEF 0x00
#define AUDIO_MPGD_CONTROL_DUAL_CHAN 0x01
#define AUDIO_MPGD_CONTROL_2ND_STEREO 0x02
#define AUDIO_MPGD_CONTROL_MULTILING 0x03
#define AUDIO_MPGD_CONTROL_DYN_RANGE 0x04
#define AUDIO_MPGD_CONTROL_SCALING 0x05
#define AUDIO_MPGD_CONTROL_HILO_SCALE 0x06
#define AUDIO_MPGD_CONTROL_UNDERFLOW 0x07
#define AUDIO_MPGD_CONTROL_OVERFLOW 0x08
#define AUDIO_MPGD_CONTROL_DECODE_ERR 0x09
/* AC-3 Decoder Control Selectors */
#define AUDIO_AC3D_CONTROL_UNDEF 0x00
#define AUDIO_AC3D_CONTROL_MODE 0x01
#define AUDIO_AC3D_CONTROL_DYN_RANGE 0x02
#define AUDIO_AC3D_CONTROL_SCALING 0x03
#define AUDIO_AC3D_CONTROL_HILO_SCALE 0x04
#define AUDIO_AC3D_CONTROL_UNDERFLOW 0x05
#define AUDIO_AC3D_CONTROL_OVERFLOW 0x06
#define AUDIO_AC3D_CONTROL_DECODE_ERR 0x07
/* WMA Decoder Control Selectors */
#define AUDIO_WMAD_CONTROL_UNDEF 0x00
#define AUDIO_WMAD_CONTROL_UNDERFLOW 0x01
#define AUDIO_WMAD_CONTROL_OVERFLOW 0x02
#define AUDIO_WMAD_CONTROL_DECODE_ERR 0x03
/* DTS Decoder Control Selectors */
#define AUDIO_DTSD_CONTROL_UNDEF 0x00
#define AUDIO_DTSD_CONTROL_UNDERFLOW 0x01
#define AUDIO_DTSD_CONTROL_OVERFLOW 0x02
#define AUDIO_DTSD_CONTROL_DECODE_ERR 0x03
/* Endpoint Control Selectors */
#define AUDIO_EP_CONTROL_UNDEF 0x00
#define AUDIO_EP_CONTROL_SAMPLING_FEQ 0x01
#define AUDIO_EP_CONTROL_PITCH 0x02
/* Encoder Error Codes */
/* <0: Reserved for vendor extensions */
#define AUDIO_ENCODER_SUCCESS 0 /* No Error */
#define AUDIO_ENCODER_ERROR_NOMEM 1 /* Out of Memory */
#define AUDIO_ENCODER_ERROR_BW 2 /* Out of Bandwidth */
#define AUDIO_ENCODER_ERROR_CYCLE 3 /* Out of Processing Cycles */
#define AUDIO_ENCODER_ERROR_FRAME 4 /* General Format Frame Error */
#define AUDIO_ENCODER_ERROR_TOOSMALL 5 /* Format Frame Too Small */
#define AUDIO_ENCODER_ERROR_TOOBIG 6 /* Format Frame Too Large */
#define AUDIO_ENCODER_ERROR_BADFORMAT 7 /* Bad Data Format */
#define AUDIO_ENCODER_ERROR_NCHAN 8 /* Incorrect Number of Channels */
#define AUDIO_ENCODER_ERROR_RATE 9 /* Incorrect Sampling Rate */
#define AUDIO_ENCODER_ERROR_BITRATE 10 /* Unable to Meet Target Bitrate */
#define AUDIO_ENCODER_ERROR_PARMS 11 /* Inconsistent Set of Parameters */
#define AUDIO_ENCODER_ERROR_NOTREADY 12 /* Not Ready */
#define AUDIO_ENCODER_ERROR_BUSY 13 /* Busy */
/* >13: Reserved */
/* Format Type Codes */
#define AUDIO_FORMAT_TYPE_UNDEF 0x00
#define AUDIO_FORMAT_TYPEI 0x01
#define AUDIO_FORMAT_TYPEII 0x02
#define AUDIO_FORMAT_TYPEIII 0x03
#define AUDIO_FORMAT_TYPEIV 0x04
#define AUDIO_FORMAT_EXT_TYPEI 0x81
#define AUDIO_FORMAT_EXT_TYPEII 0x82
#define AUDIO_FORMAT_EXT_TYPEIII 0x83
/* Audio Data Format Type I Bit Allocations */
#define AUDIO_FORMAT_TYPEI_PCM (1 << 0)
#define AUDIO_FORMAT_TYPEI_PCM8 (1 << 1)
#define AUDIO_FORMAT_TYPEI_IEEEFLOAT (1 << 2)
#define AUDIO_FORMAT_TYPEI_ALAW (1 << 3)
#define AUDIO_FORMAT_TYPEI_MULAW (1 << 4)
#define AUDIO_FORMAT_TYPEI_RAWDATA (1 << 31)
/* Audio Data Format Type II Bit Allocations */
#define AUDIO_FORMAT_TYPEII_MPEG (1 << 0)
#define AUDIO_FORMAT_TYPEII_AC3 (1 << 1)
#define AUDIO_FORMAT_TYPEII_WMA (1 << 2)
#define AUDIO_FORMAT_TYPEII_DTS (1 << 3)
#define AUDIO_FORMAT_TYPEII_RAWDATA (1 << 31)
/* Audio Data Format Type III Bit Allocations */
#define AUDIO_FORMAT_TYPEIII_IEC61937_AC3 (1 << 0)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG1_L1 (1 << 1)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG1_L2_3 (1 << 1)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG2_NOEXT (1 << 2)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG2_EXT (1 << 3)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG2_AAC_ADTS (1 << 4)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG2_L1_LS (1 << 5)
#define AUDIO_FORMAT_TYPEIII_IEC61937_MPEG2_L2_3_LS (1 << 6)
#define AUDIO_FORMAT_TYPEIII_IEC61937_DTS_I (1 << 7)
#define AUDIO_FORMAT_TYPEIII_IEC61937_DTS_II (1 << 8)
#define AUDIO_FORMAT_TYPEIII_IEC61937_DTS_III (1 << 9)
#define AUDIO_FORMAT_TYPEIII_IEC61937_ATRAC (1 << 10)
#define AUDIO_FORMAT_TYPEIII_IEC61937_ATRAC2_3 (1 << 11)
#define AUDIO_FORMAT_TYPEIII_WMA (1 << 12)
/* Audio Data Format Type IV Bit Allocations */
#define AUDIO_FORMAT_TYPEIV_PCM (1 << 0)
#define AUDIO_FORMAT_TYPEIV_PCM8 (1 << 1)
#define AUDIO_FORMAT_TYPEIV_IEEE_FLOAT (1 << 2)
#define AUDIO_FORMAT_TYPEIV_ALAW (1 << 3)
#define AUDIO_FORMAT_TYPEIV_MULAW (1 << 4)
#define AUDIO_FORMAT_TYPEIV_MPEG (1 << 5)
#define AUDIO_FORMAT_TYPEIV_AC3 (1 << 6)
#define AUDIO_FORMAT_TYPEIV_WMA (1 << 7)
#define AUDIO_FORMAT_TYPEIV_IEC61937_AC3 (1 << 8)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG1_L1 (1 << 9)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG1_L2_3 (1 << 10)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG2_NOEXT (1 << 10)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG2_EXT (1 << 11)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG2_AAC_ADTS (1 << 12)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG2_L1_LS (1 << 13)
#define AUDIO_FORMAT_TYPEIV_IEC61937_MPEG2_L2_3_LS (1 << 14)
#define AUDIO_FORMAT_TYPEIV_IEC61937_DTS_I (1 << 15)
#define AUDIO_FORMAT_TYPEIV_IEC61937_DTS_II (1 << 16)
#define AUDIO_FORMAT_TYPEIV_IEC61937_DTS_III (1 << 17)
#define AUDIO_FORMAT_TYPEIV_IEC61937_ATRAC (1 << 18)
#define AUDIO_FORMAT_TYPEIV_IEC61937_ATRAC2_3 (1 << 19)
#define AUDIO_FORMAT_TYPEIV_TYPE_III_WMA (1 << 20)
#define AUDIO_FORMAT_TYPEIV_IEC60958_PCM (1 << 21)
/* Side Band Protocol Codes */
#define AUDIO_SIDEBAND_PROTOCOL_UNDEF 0x00
#define AUDIO_PRES_TIMESTAMP_PROTOCOL 0x01
/** USB Terminal Types
* Refer to Table 2-1 - Table 2-4 from termt10.pdf
*/
/* USB Terminal Types */
#define AUDIO_TERMINAL_UNDEF 0x0100
#define AUDIO_TERMINAL_STREAMING 0x0101
#define AUDIO_TERMINAL_VENDOR 0x01ff
/* Input Terminal Types */
#define AUDIO_INTERM_UNDEF 0x0200 /* Undefined Type */
#define AUDIO_INTERM_MIC 0x0201 /* A generic microhpone */
#define AUDIO_INTERM_DESKTOP_MIC 0x0202 /* A desktop microphone */
#define AUDIO_INTERM_PERSONAL_MIC 0x0203 /* Head-mounted or clip-on microphone */
#define AUDIO_INTERM_OMNI_MIC 0x0204 /* Omni-directional microphone */
#define AUDIO_INTERM_MIC_ARRAY 0x0205 /* Microphone array */
#define AUDIO_INTERM_PROC_MIC_ARRAY 0x0206 /* Microphone array with signal processor */
/* Output Terminal Types */
#define AUDIO_OUTTERM_UNDEF 0x0300 /* Undefined Type */
#define AUDIO_OUTTERM_SPEAKER 0x0301 /* Generic speakers */
#define AUDIO_OUTTERM_HEADPHONES 0x0302 /* A head-mounted audio output device */
#define AUDIO_OUTTERM_HEADDISPLAY 0x0303 /* Head Mounted Display Audio */
#define AUDIO_OUTTERM_DESKTOP 0x0304 /* Desktop speaker */
#define AUDIO_OUTTERM_ROOM 0x0305 /* Room speaker */
#define AUDIO_OUTTERM_COMMS 0x0306 /* Communication speaker */
#define AUDIO_OUTTERM_LOFREQ 0x0307 /* Low frequency effects speaker */
/* Bi-directional Terminal Types */
#define AUDIO_BIDITERM_UNDEF 0x0400 /* Undefined Type */
#define AUDIO_BIDITERM_HANDSET 0x0401 /* Hand-held bi-directional audio device */
#define AUDIO_BIDITERM_HEADSET 0x0402 /* Head-mounted bi-directional audio device */
#define AUDIO_BIDITERM_SPEAKERPHONE 0x0403 /* Speakerphone, no echo reduction */
#define AUDIO_BIDITERM_ECHOSUPPRESS 0x0404 /* Echo-suppressing speakerphone */
#define AUDIO_BIDITERM_ECHOCANCEL 0x0405 /* Echo-canceling speakerphone */
/* Telephony Terminal Types */
#define AUDIO_TELETERM_UNDEF 0x0500 /* Undefined Type */
#define AUDIO_TELETERM_PHONELINE 0x0501 /* Analog telephone line jack, an ISDN line,
* a proprietary PBX interface, or a wireless link */
#define AUDIO_TELETERM_TELEPHONE 0x0502 /* Device can be used as a telephone */
#define AUDIO_TELETERM_DOWNLINE 0x0503 /* Down Line Phone */
/* External Terminal Types */
#define AUDIO_EXTTERM_UNDEF 0x0600 /* Undefined Type */
#define AUDIO_EXTTERM_ANALOG 0x0601 /* Generic analog connector */
#define AUDIO_EXTTERM_DIGITAL 0x0602 /* Generic digital audio interface */
#define AUDIO_EXTTERM_LINE 0x0603 /* Analog connector at standard line levels */
#define AUDIO_EXTTERM_LEGACY 0x0604 /* Legacy audio line out connector */
#define AUDIO_EXTTERM_SPDIF 0x0605 /* SPDIF interface */
#define AUDIO_EXTTERM_1394DA 0x0606 /* 1394 DA stream */
#define AUDIO_EXTTERM_1394DV 0x0607 /* 1394 DV stream soundtrack */
#define AUDIO_EXTTERM_ADAT 0x0608 /* ADAT Lightpipe */
#define AUDIO_EXTTERM_TDIF 0x0609 /* TDIF - Tascam Digital Interface */
#define AUDIO_EXTTERM_MADI 0x060a /* MADI - Multi-channel Audio Digital Interface (AES) */
/* Embedded Function Terminal Types */
#define AUDIO_EMBEDTERM_UNDEF 0x0700 /* Undefined Type */
#define AUDIO_EMBEDTERM_CALIBRATION 0x0701 /* Level Calibration Noise Source */
#define AUDIO_EMBEDTERM_EQUALIZATION 0x0702 /* Equalization Noise */
#define AUDIO_EMBEDTERM_CD 0x0703 /* CD player */
#define AUDIO_EMBEDTERM_DAT 0x0704 /* Digital Audio Tape */
#define AUDIO_EMBEDTERM_DCC 0x0705 /* Digital Compact Cassette */
#define AUDIO_EMBEDTERM_COMPRESSED 0x0706 /* Compressed Audio Player */
#define AUDIO_EMBEDTERM_TAPE 0x0707 /* Analog Audio Tape */
#define AUDIO_EMBEDTERM_PHONOGRAPH 0x0708 /* Analog vinyl record player */
#define AUDIO_EMBEDTERM_VCR 0x0709 /* Audio track of VCR */
#define AUDIO_EMBEDTERM_VIDDISC 0x070a /* Audio track of VideoDisc player */
#define AUDIO_EMBEDTERM_DVD 0x070b /* Audio track of DVD player */
#define AUDIO_EMBEDTERM_TVTUNER 0x070c /* Audio track of TV tuner */
#define AUDIO_EMBEDTERM_SATELLITE 0x070d /* Audio track of satellite receiver */
#define AUDIO_EMBEDTERM_CABLETUNER 0x070e /* Audio track of cable tuner */
#define AUDIO_EMBEDTERM_DSS 0x070f /* Audio track of DSS receiver */
#define AUDIO_EMBEDTERM_RADIO 0x0710 /* AM/FM radio receiver */
#define AUDIO_EMBEDTERM_TRANSMITTER 0x0711 /* AM/FM radio transmitter */
#define AUDIO_EMBEDTERM_MULTITRACK 0x0712 /* A multi-track recording system */
#define AUDIO_EMBEDTERM_SYNTHESIZER 0x0713 /* Synthesizer */
#define AUDIO_EMBEDTERM_PIANO 0x0714 /* Piano */
#define AUDIO_EMBEDTERM_GUITAR 0x0715 /* Guitar */
#define AUDIO_EMBEDTERM_PERCUSSON 0x0716 /* Percussion Instrument */
#define AUDIO_EMBEDTERM_INSTRUMENT 0x0717 /* Other Musical Instrument */
#define AUDIO_FORMAT_TYPE_I 0x01
#define AUDIO_FORMAT_TYPE_II 0x02
#define AUDIO_FORMAT_TYPE_III 0x03
struct audio_cs_if_ac_header_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint16_t bcdADC;
uint16_t wTotalLength;
uint8_t bInCollection;
uint8_t baInterfaceNr[];
} __PACKED;
#define AUDIO_SIZEOF_AC_HEADER_DESC(n) (8 + n)
struct audio_cs_if_ac_input_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bNrChannels;
uint16_t wChannelConfig;
uint8_t iChannelNames;
uint8_t iTerminal;
} __PACKED;
#define AUDIO_SIZEOF_AC_INPUT_TERMINAL_DESC (12)
struct audio_cs_if_ac_output_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bSourceID;
uint8_t iTerminal;
} __PACKED;
#define AUDIO_SIZEOF_AC_OUTPUT_TERMINAL_DESC (9)
struct audio_cs_if_ac_feature_unit_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bUnitID;
uint8_t bSourceID;
uint8_t bControlSize;
uint8_t bmaControls[1];
uint8_t iFeature;
} __PACKED;
#define AUDIO_SIZEOF_AC_FEATURE_UNIT_DESC(ch, n) (7 + (ch + 1) * n)
struct audio_cs_if_ac_selector_unit_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bUnitID;
uint8_t bNrInPins;
uint8_t baSourceID[1];
uint8_t iSelector;
} __PACKED;
#define AUDIO_SIZEOF_AC_SELECTOR_UNIT_DESC(n) (6 + n)
struct audio_cs_if_as_general_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalLink;
uint8_t bDelay;
uint16_t wFormatTag;
} __PACKED;
#define AUDIO_SIZEOF_AS_GENERAL_DESC (7)
struct audio_cs_if_as_format_type_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bFormatType;
uint8_t bNrChannels;
uint8_t bSubframeSize;
uint8_t bBitResolution;
uint8_t bSamFreqType;
uint8_t tSamFreq[3];
} __PACKED;
#define AUDIO_SIZEOF_FORMAT_TYPE_DESC(n) (8 + 3 * n)
struct audio_ep_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bEndpointAddress;
uint8_t bmAttributes;
uint16_t wMaxPacketSize;
uint8_t bInterval;
uint8_t bRefresh;
uint8_t bSynchAddress;
} __PACKED;
#define AUDIO_SIZEOF_EP_DESC (9)
struct audio_cs_ep_ep_general_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bmAttributes;
uint8_t bLockDelayUnits;
uint16_t wLockDelay;
} __PACKED;
#define AUDIO_SIZEOF_CS_EP_GENERAL_DESC (7)
// clang-format off
#define AUDIO_AC_DESCRIPTOR_INIT(bFirstInterface, bInterfaceCount, wTotalLength, stridx, ...) \
/* Interface Association Descriptor */ \
0x08, \
USB_DESCRIPTOR_TYPE_INTERFACE_ASSOCIATION, \
bFirstInterface, \
bInterfaceCount, \
USB_DEVICE_CLASS_AUDIO, \
AUDIO_SUBCLASS_AUDIOCONTROL, \
AUDIO_PROTOCOL_UNDEFINED, \
0x00, \
/* ------------------ AudioControl Interface ------------------ */\
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bFirstInterface, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x00, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOCONTROL, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
stridx, /* iInterface */ \
0x08 + PP_NARG(__VA_ARGS__), /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_HEADER, /* bDescriptorSubtype */ \
WBVAL(0x0100), /* bcdADC */ \
WBVAL(wTotalLength), /* wTotalLength */ \
PP_NARG(__VA_ARGS__), /* bInCollection */ \
__VA_ARGS__ /* baInterfaceNr */
#define AUDIO_AC_DESCRIPTOR_INIT_LEN(n) (0x08 + 0x09 + 0x08 + n)
#define AUDIO_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(bTerminalID, wTerminalType, bNrChannels, wChannelConfig) \
0x0C, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype */ \
bTerminalID, /* bTerminalID */ \
WBVAL(wTerminalType), /* wTerminalType : Microphone 0x0201 */ \
0x00, /* bAssocTerminal */ \
bNrChannels, /* bNrChannels */ \
WBVAL(wChannelConfig), /* wChannelConfig : Mono sets no position bits */ \
0x00, /* iChannelNames */ \
0x00 /* iTerminal */
#define AUDIO_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(bTerminalID, wTerminalType, bSourceID) \
0x09, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype */ \
bTerminalID, /* bTerminalID */ \
WBVAL(wTerminalType), /* wTerminalType : USB Streaming */ \
0x00, /* bAssocTerminal */ \
bSourceID, /* bSourceID */ \
0x00 /* iTerminal */
#define AUDIO_AC_FEATURE_UNIT_DESCRIPTOR_INIT(bUnitID, bSourceID, bControlSize, ...) \
0x07 + PP_NARG(__VA_ARGS__), /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype */ \
bUnitID, /* bUnitID */ \
bSourceID, /* bSourceID */ \
bControlSize, /* bControlSize */ \
__VA_ARGS__, /* bmaControls(0) Mute */ \
0x00 /* iTerminal */
#define AUDIO_AS_DESCRIPTOR_INIT(bInterfaceNumber, bTerminalLink, bNrChannels, bSubFrameSize, bBitResolution, bEndpointAddress, bmAttributes, wMaxPacketSize, bInterval, ...) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x00, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x01, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x07, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */ \
bTerminalLink, /* bTerminalLink : Unit ID of the Output Terminal*/ \
0x01, /* bDelay */ \
WBVAL(AUDIO_FORMAT_PCM), /* wFormatTag : AUDIO_FORMAT_PCM */ \
0x08 + PP_NARG(__VA_ARGS__), /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType */ \
bNrChannels, /* bNrChannels */ \
bSubFrameSize, /* bSubFrameSize : Bytes per audio subframe */ \
bBitResolution, /* bBitResolution : bits per sample */ \
(PP_NARG(__VA_ARGS__)/3), /* bSamFreqType : only one frequency supported */ \
__VA_ARGS__, /* tSamFreq : Audio sampling frequency coded on 3 bytes */ \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bEndpointAddress, /* bEndpointAddress : IN endpoint 1 */ \
bmAttributes, /* bmAttributes */ \
WBVAL(wMaxPacketSize), /* wMaxPacketSize */ \
bInterval, /* bInterval : one packet per frame */ \
0x00, /* bRefresh */ \
0x00, /* bSynchAddress */ \
0x07, /* bLength */ \
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */ \
AUDIO_EP_CONTROL_SAMPLING_FEQ, /* bmAttributes AUDIO_SAMPLING_FREQ_CONTROL */ \
0x00, /* bLockDelayUnits */ \
0x00, /* wLockDelay */ \
0x00
#define AUDIO_AS_DESCRIPTOR_INIT_LEN(n) (0x09 + 0x09 + 0x07 + 0x08 + 3 * n + 0x09 + 0x07)
#define AUDIO_AS_ALTSETTING_DESCRIPTOR_INIT(bInterfaceNumber, bAlternateSetting, bTerminalLink, bNrChannels, bSubFrameSize, bBitResolution, bEndpointAddress, bmAttributes, wMaxPacketSize, bInterval, ...) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
bAlternateSetting, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x07, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */ \
bTerminalLink, /* bTerminalLink : Unit ID of the Output Terminal*/ \
0x01, /* bDelay */ \
WBVAL(AUDIO_FORMAT_PCM), /* wFormatTag : AUDIO_FORMAT_PCM */ \
0x08 + PP_NARG(__VA_ARGS__), /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType */ \
bNrChannels, /* bNrChannels */ \
bSubFrameSize, /* bSubFrameSize : Bytes per audio subframe */ \
bBitResolution, /* bBitResolution : bits per sample */ \
(PP_NARG(__VA_ARGS__)/3), /* bSamFreqType : only one frequency supported */ \
__VA_ARGS__, /* tSamFreq : Audio sampling frequency coded on 3 bytes */ \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bEndpointAddress, /* bEndpointAddress : IN endpoint 1 */ \
bmAttributes, /* bmAttributes */ \
WBVAL(wMaxPacketSize), /* wMaxPacketSize */ \
bInterval, /* bInterval : one packet per frame */ \
0x00, /* bRefresh */ \
0x00, /* bSynchAddress */ \
0x07, /* bLength */ \
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */ \
AUDIO_EP_CONTROL_SAMPLING_FEQ, /* bmAttributes AUDIO_SAMPLING_FREQ_CONTROL */ \
0x00, /* bLockDelayUnits */ \
0x00, /* wLockDelay */ \
0x00
#define AUDIO_AS_ALTSETTING_DESCRIPTOR_INIT_LEN(n) (0x09 + 0x07 + 0x08 + 3 * n + 0x09 + 0x07)
#define AUDIO_AS_ALTSETTING0_DESCRIPTOR_INIT(bInterfaceNumber) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
0x00 /* iInterface */
#define AUDIO_MS_STANDARD_DESCRIPTOR_INIT(bInterfaceNumber, bNumEndpoints) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
bNumEndpoints, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_MIDISTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */ \
0x00 /* iInterface */
#define AUDIO_MS_STANDARD_DESCRIPTOR_INIT_LEN 0x09
struct audio_v2_channel_cluster_descriptor {
uint8_t bNrChannels;
uint32_t bmChannelConfig;
uint8_t iChannelNames;
} __PACKED;
#define AUDIO_V2_SIZEOF_CHANNEL_CLUSTER_DESC (6)
struct audio_v2_cs_if_ac_header_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint16_t bcdADC;
uint8_t bCategory;
uint16_t wTotalLength;
uint8_t bmControls;
} __PACKED;
#define AUDIO_V2_SIZEOF_AC_HEADER_DESC (9)
struct audio_v2_cs_if_ac_clock_source_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bClockID;
uint8_t bmAttributes;
uint8_t bmControls;
uint8_t bAssocTerminal;
uint8_t iClockSource;
} __PACKED;
#define AUDIO_V2_SIZEOF_AC_CLOCK_SOURCE_DESC (8)
struct audio_v2_cs_if_ac_clock_selector_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bClockID;
uint8_t bNrInPins;
uint8_t baCSourceID[1];
uint8_t iClockSelector;
} __PACKED;
#define AUDIO_SIZEOF_AC_CLOCK_SELECTOR_DESC(n) (7 + n)
struct audio_v2_cs_if_ac_clock_multiplier_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bClockID;
uint8_t bCSourceID;
uint8_t bmControls;
uint8_t iClockMultiplier;
} __PACKED;
#define AUDIO_SIZEOF_AC_CLOCK_MULTIPLIER_DESC() (7)
struct audio_v2_cs_if_ac_input_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bCSourceID;
uint8_t bNrChannels;
uint32_t wChannelConfig;
uint8_t iChannelNames;
uint16_t bmControls;
uint8_t iTerminal;
} __PACKED;
#define AUDIO_V2_SIZEOF_AC_INPUT_TERMINAL_DESC (17)
struct audio_v2_cs_if_ac_output_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bSourceID;
uint8_t bCSourceID;
uint16_t bmControls;
uint8_t iTerminal;
} __PACKED;
#define AUDIO_V2_SIZEOF_AC_OUTPUT_TERMINAL_DESC (12)
struct audio_v2_cs_if_ac_feature_unit_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bUnitID;
uint8_t bSourceID;
uint32_t bmaControls[1];
uint8_t iFeature;
} __PACKED;
#define AUDIO_V2_SIZEOF_AC_FEATURE_UNIT_DESC(ch) (6 + (ch + 1) * 4)
struct audio_v2_cs_if_as_general_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalLink;
uint8_t bmControls;
uint8_t bFormatType;
uint32_t bmFormats;
uint8_t bNrChannels;
uint32_t bmChannelConfig;
uint8_t iChannelNames;
} __PACKED;
#define AUDIO_V2_SIZEOF_AS_GENERAL_DESC (16)
struct audio_v2_control_range1_param_block {
uint16_t wNumSubRanges;
struct
{
uint8_t bMin;
uint8_t bMax;
uint8_t bRes;
}subrange[];
} __PACKED;
struct audio_v2_control_range2_param_block {
uint16_t wNumSubRanges;
struct
{
uint16_t wMin;
uint16_t wMax;
uint16_t wRes;
}subrange[];
} __PACKED;
struct audio_v2_control_range3_param_block {
uint16_t wNumSubRanges;
struct
{
uint32_t dMin;
uint32_t dMax;
uint32_t dRes;
}subrange[];
} __PACKED;
#define AUDIO_V2_AC_DESCRIPTOR_INIT(bFirstInterface, bInterfaceCount, wTotalLength, bCategory, bmControls, stridx) \
/* Interface Association Descriptor */ \
0x08, \
USB_DESCRIPTOR_TYPE_INTERFACE_ASSOCIATION, \
bFirstInterface, \
bInterfaceCount, \
USB_DEVICE_CLASS_AUDIO, \
AUDIO_SUBCLASS_UNDEFINED, \
AUDIO_PROTOCOLv20, \
0x00, \
/* ------------------ AudioControl Interface ------------------ */\
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bFirstInterface, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x00, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOCONTROL, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
stridx, /* iInterface */ \
0x09, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_HEADER, /* bDescriptorSubtype */ \
WBVAL(0x0200), /* bcdADC */ \
bCategory, /* bCategory */ \
WBVAL(wTotalLength), /* wTotalLength */ \
bmControls /* bmControls */ \
#define AUDIO_V2_AC_DESCRIPTOR_INIT_LEN (0x08 + 0x09 + 0x09)
#define AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(bClockID, bmAttributes, bmControls) \
0x08, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_CLOCK_SOURCE, /* bDescriptorSubtype */ \
bClockID, /* bClockID */ \
bmAttributes, /* bmAttributes */ \
bmControls, /* bmControls */ \
0x00, /* bAssocTerminal */ \
0x00 /* iClockSource */
#define AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(bTerminalID, wTerminalType, bCSourceID, bNrChannels, wChannelConfig, bmControls) \
0x11, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype */ \
bTerminalID, /* bTerminalID */ \
WBVAL(wTerminalType), /* wTerminalType : Microphone 0x0201 */ \
0x00, /* bAssocTerminal */ \
bCSourceID, /* bCSourceID */ \
bNrChannels, /* bNrChannels */ \
DBVAL(wChannelConfig), /* wChannelConfig : Mono sets no position bits */ \
0x00, /* iChannelNames */ \
WBVAL(bmControls), /* bmControls */ \
0x00 /* iTerminal */
#define AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(bTerminalID, wTerminalType, bSourceID, bCSourceID, bmControls) \
0x0c, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype */ \
bTerminalID, /* bTerminalID */ \
WBVAL(wTerminalType), /* wTerminalType : USB Streaming */ \
0x00, /* bAssocTerminal */ \
bSourceID, /* bSourceID */ \
bCSourceID, /* bCSourceID */ \
WBVAL(bmControls), /* bmControls */ \
0x00 /* iTerminal */
#define AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(bUnitID, bSourceID, ...) \
0x06 + (PP_NARG(__VA_ARGS__)), /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype */ \
bUnitID, /* bUnitID */ \
bSourceID, /* bSourceID */ \
__VA_ARGS__, /* bmaControls(0) Mute */ \
0x00 /* iTerminal */
#define AUDIO_V2_AS_DESCRIPTOR_INIT(bInterfaceNumber, bTerminalLink, bNrChannels, bmChannelConfig, bSubslotSize, bBitResolution, bEndpointAddress, bmAttributes, wMaxPacketSize, bInterval) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x00, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x01, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x10, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */ \
bTerminalLink, /* bTerminalLink : Unit ID of the Output or Input Terminal*/ \
0x00, /* bmControls */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType : AUDIO_FORMAT_TYPE_I */ \
DBVAL(AUDIO_V2_FORMAT_PCM), /* bmFormats PCM */ \
bNrChannels, /* bNrChannels */ \
DBVAL(bmChannelConfig), /* bmChannelConfig */ \
0x00, /* iChannelNames */ \
0x06, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType */ \
bSubslotSize, /* bSubslotSize */ \
bBitResolution, /* bBitResolution */ \
0x07, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bEndpointAddress, /* bEndpointAddress 3 out endpoint for Audio */ \
bmAttributes, /* bmAttributes */ \
WBVAL(wMaxPacketSize), /* XXXX wMaxPacketSize in Bytes (SampleRate * SlotByteSize * NumChannels) */ \
bInterval, /* bInterval */ \
0x08, /* bLength */ \
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */ \
0x00, /* bmAttributes */ \
0x00, /* bmControls */ \
0x00, /* bLockDelayUnits */ \
0x00, /* wLockDelay */ \
0x00
#define AUDIO_V2_AS_ALTSETTING_DESCRIPTOR_INIT(bInterfaceNumber, bAlternateSetting, bTerminalLink, bNrChannels, bmChannelConfig, bSubslotSize, bBitResolution, bEndpointAddress, bmAttributes, wMaxPacketSize, bInterval) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
bAlternateSetting, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x10, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */ \
bTerminalLink, /* bTerminalLink : Unit ID of the Output or Input Terminal*/ \
0x00, /* bmControls */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType : AUDIO_FORMAT_TYPE_I */ \
DBVAL(AUDIO_V2_FORMAT_PCM), /* bmFormats PCM */ \
bNrChannels, /* bNrChannels */ \
DBVAL(bmChannelConfig), /* bmChannelConfig */ \
0x00, /* iChannelNames */ \
0x06, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType */ \
bSubslotSize, /* bSubslotSize */ \
bBitResolution, /* bBitResolution */ \
0x07, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bEndpointAddress, /* bEndpointAddress 3 out endpoint for Audio */ \
bmAttributes, /* bmAttributes */ \
WBVAL(wMaxPacketSize), /* XXXX wMaxPacketSize in Bytes (SampleRate * SlotByteSize * NumChannels) */ \
bInterval, /* bInterval */ \
0x08, /* bLength */ \
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */ \
0x00, /* bmAttributes */ \
0x00, /* bmControls */ \
0x00, /* bLockDelayUnits */ \
0x00, /* wLockDelay */ \
0x00
#define AUDIO_V2_AS_ALTSETTING0_DESCRIPTOR_INIT(bInterfaceNumber) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x01, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00 /* iInterface */
#define AUDIO_V2_AS_FEEDBACK_DESCRIPTOR_INIT(bInterfaceNumber, bTerminalLink, bNrChannels, bmChannelConfig, bSubslotSize, bBitResolution, bEndpointAddress, wMaxPacketSize, bInterval, bFeedbackEndpointAddress) \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x00, /* bAlternateSetting */ \
0x00, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x09, /* bLength */ \
USB_DESCRIPTOR_TYPE_INTERFACE, /* bDescriptorType */ \
bInterfaceNumber, /* bInterfaceNumber */ \
0x01, /* bAlternateSetting */ \
0x02, /* bNumEndpoints */ \
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */ \
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */ \
AUDIO_PROTOCOLv20, /* bInterfaceProtocol */ \
0x00, /* iInterface */ \
0x10, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */ \
bTerminalLink, /* bTerminalLink : Unit ID of the Output or Input Terminal*/ \
0x00, /* bmControls */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType : AUDIO_FORMAT_TYPE_I */ \
DBVAL(AUDIO_V2_FORMAT_PCM), /* bmFormats PCM */ \
bNrChannels, /* bNrChannels */ \
DBVAL(bmChannelConfig), /* bmChannelConfig */ \
0x00, /* iChannelNames */ \
0x06, /* bLength */ \
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ \
AUDIO_FORMAT_TYPE_I, /* bFormatType */ \
bSubslotSize, /* bSubslotSize */ \
bBitResolution, /* bBitResolution */ \
0x07, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bEndpointAddress, /* bEndpointAddress 3 out endpoint for Audio */ \
0x05, /* bmAttributes: TransferType=Isochronous SyncType=Asynchronous EndpointType=Data*/ \
WBVAL(wMaxPacketSize), /* XXXX wMaxPacketSize in Bytes (SampleRate * SlotByteSize * NumChannels) */ \
bInterval, /* bInterval */ \
0x08, /* bLength */ \
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ \
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */ \
0x00, /* bmAttributes */ \
0x00, /* bmControls */ \
0x00, /* bLockDelayUnits */ \
0x00, /* wLockDelay */ \
0x00, \
0x07, /* bLength */ \
USB_DESCRIPTOR_TYPE_ENDPOINT, /* bDescriptorType */ \
bFeedbackEndpointAddress, /* bFeedbackEndpointAddress Revise Dir to bEndpointAddress */ \
0x11, /* bmAttributes: TransferType=Isochronous SyncType=None EndpointType=Feedback */ \
WBVAL(4), /* XXXX wMaxPacketSize in Bytes */ \
bInterval /* bInterval */
// clang-format on
#define AUDIO_V2_AS_DESCRIPTOR_INIT_LEN (0x09 + 0x09 + 0x10 + 0x06 + 0x07 + 0x08)
#define AUDIO_V2_AS_ALTSETTING_DESCRIPTOR_INIT_LEN (0x09 + 0x10 + 0x06 + 0x07 + 0x08)
#define AUDIO_V2_AS_FEEDBACK_DESCRIPTOR_INIT_LEN (0x09 + 0x09 + 0x10 + 0x06 + 0x07 + 0x08 + 0x07)
#define AUDIO_SAMPLE_FREQ_NUM(num) (uint8_t)(num), (uint8_t)((num >> 8))
#define AUDIO_SAMPLE_FREQ_3B(frq) (uint8_t)(frq), (uint8_t)((frq >> 8)), (uint8_t)((frq >> 16))
#define AUDIO_SAMPLE_FREQ_4B(frq) (uint8_t)(frq), (uint8_t)((frq >> 8)), \
(uint8_t)((frq >> 16)), (uint8_t)((frq >> 24))
#endif /* USB_AUDIO_H */