ATMEL: usb_commun_audio.h File Reference

Used in:

Mixer Unit Control requests
Feature Unit Control requests with AUDIO_FU_CONTROL_CS_VOLUME

The settings for the CUR, MIN, and MAX attributes can range from +127.9961 dB (0x7FFF) down to -127.9961 dB (0x8001) in steps of 1/256 dB The range for the CUR attribute is extended by code 0x8000, representing silence, i.e., -� dB. The settings for the RES attribute can only take positive values and range from 1/256 dB (0x0001) to +127.9961 dB (0x7FFF).

usb_commun_audio.h File Reference

Defines

Detailed Description

Define Documentation


Defines
#define	AUDIO_CLASS_REVISION 0x0100
	Revision of class specification - 1.0.
Global Class, SubClass & Protocol constants for AUDIO
#define	AUDIO_CLASS 0x01
#define	AUDIO_SUB_CLASS_CONTROL 0x01
	Audio control sub class.
#define	AUDIO_SUB_CLASS_STREAMING 0x02
	Audio stream sub class.
#define	AUDIO_SUB_CLASS_MIDISTREAMING 0x03
	Audio midi stream sub class.
Audio Class-Specific Descriptor Types
#define	DESCRIPTOR_AUDIO_UNDEFINED 0x20
#define	DESCRIPTOR_AUDIO_DEVICE 0x21
#define	DESCRIPTOR_AUDIO_CONFIGURATION 0x22
#define	DESCRIPTOR_AUDIO_STRING 0x23
#define	DESCRIPTOR_AUDIO_INTERFACE 0x24
#define	DESCRIPTOR_AUDIO_ENDPOINT 0x25
Audio Class-Specific AC Interface Descriptor Subtypes
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_UNDEFINED 0x00
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_HEADER 0x01
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_INPUT_TERMINAL 0x02
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_OUTPUT_TERMINAL 0x03
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_MIXER_UNIT 0x04
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_SELECTOR_UNIT 0x05
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_FEATURE_UNIT 0x06
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_PROCESSING_UNIT 0x07
#define	DESCRIPTOR_SUBTYPE_AUDIO_AC_EXTENSION_UNIT 0x08
Audio Class-Specific AS Interface Descriptor Subtypes
#define	DESCRIPTOR_SUBTYPE_AUDIO_AS_UNDEFINED 0x00
#define	DESCRIPTOR_SUBTYPE_AUDIO_AS_GENERAL 0x01
#define	DESCRIPTOR_SUBTYPE_AUDIO_AS_FORMAT_TYPE 0x02
#define	DESCRIPTOR_SUBTYPE_AUDIO_AS_FORMAT_SPECIFIC 0x03
Audio Class-Specific Endpoint Descriptor Subtypes
#define	DESCRIPTOR_SUBTYPE_AUDIO_ENDP_UNDEFINED 0x00
#define	DESCRIPTOR_SUBTYPE_AUDIO_ENDP_GENERAL 0x01
Processing Unit Process Types (in request DESCRIPTOR_AUDIO_INTERFACE + DESCRIPTOR_SUBTYPE_AUDIO_AC_PROCESSING_UNIT)
#define	AUDIO_PROCESSING_UNIT_UNDEFINED 0x00
#define	AUDIO_PROCESSING_UNIT_UPDOWNMIX 0x01
#define	AUDIO_PROCESSING_UNIT_DOLBY_PROLOGIC 0x02
#define	AUDIO_PROCESSING_UNIT_3D_STEREO_EXTENDER 0x03
#define	AUDIO_PROCESSING_UNIT_REVERBERATION 0x04
#define	AUDIO_PROCESSING_UNIT_CHORUS 0x05
#define	AUDIO_PROCESSING_UNIT_DYN_RANGE_COMP 0x06
logical audio channels
There are twelve predefined spatial locations:
#define	AUDIO_CHANNEL_NO_POSITION 0x0000
#define	AUDIO_CHANNEL_L 0x0001
#define	AUDIO_CHANNEL_R 0x0002
#define	AUDIO_CHANNEL_C 0x0004
#define	AUDIO_CHANNEL_LFE 0x0008
#define	AUDIO_CHANNEL_LS 0x0010
#define	AUDIO_CHANNEL_RS 0x0020
#define	AUDIO_CHANNEL_LC 0x0040
#define	AUDIO_CHANNEL_RC 0x0080
#define	AUDIO_CHANNEL_S 0x0100
#define	AUDIO_CHANNEL_SL 0x0200
#define	AUDIO_CHANNEL_SR 0x0400
#define	AUDIO_CHANNEL_T 0x0800
USB Terminal Types
#define	AUDIO_TE_TYPE_USB_UNDEFINE 0x0100
#define	AUDIO_TE_TYPE_USB_STREAMING 0x0101
#define	AUDIO_TE_TYPE_USB_VENDOR_SPECIFIC 0x01FF
Input Terminal Types
#define	AUDIO_TE_TYPE_INPUT_UNDEFINED 0x0200
#define	AUDIO_TE_TYPE_INPUT_MICROPHONE 0x0201
#define	AUDIO_TE_TYPE_INPUT_DESKTOP_MICROPHONE 0x0202
#define	AUDIO_TE_TYPE_INPUT_PERSONAL_MICROPHONE 0x0203
#define	AUDIO_TE_TYPE_INPUT_OMNI_DIRECTIONAL_MICROPHONE 0x0204
#define	AUDIO_TE_TYPE_INPUT_MICROPHONE_ARRAY 0x0205
#define	AUDIO_TE_TYPE_INPUT_PROCESSING_MICROPHONE_ARRAY 0x0206
Output Terminal Types
#define	AUDIO_TE_TYPE_OUTPUT_UNDEFINED 0x0300
#define	AUDIO_TE_TYPE_OUTPUT_SPEAKER 0x0301
#define	AUDIO_TE_TYPE_OUTPUT_HEADPHONES 0x0302
#define	AUDIO_TE_TYPE_OUTPUT_HEAD_MOUNTED DISPLAY AUDIO 0x0303
#define	AUDIO_TE_TYPE_OUTPUT_DESKTOP_SPEAKER 0x0304
#define	AUDIO_TE_TYPE_OUTPUT_ROOM_SPEAKER 0x0305
#define	AUDIO_TE_TYPE_OUTPUT_COMMUNICATION_SPEAKER 0x0306
#define	AUDIO_TE_TYPE_OUTPUT_LOW_FREQUENCY_EFFECTS_SPEAKER 0x0307
Bi-directional Terminal Types
#define	AUDIO_TE_TYPE_BI_UNDEFINED 0x0400
#define	AUDIO_TE_TYPE_BI_HANDSET 0x0401
#define	AUDIO_TE_TYPE_BI_HEADSET 0x0402
#define	AUDIO_TE_TYPE_BI_SPEAKERPHONE_NO_ECHO_REDUCTION 0x0403
#define	AUDIO_TE_TYPE_BI_ECHO_SUPPRESSING_SPEAKERPHONE 0x0404
#define	AUDIO_TE_TYPE_BI_ECHO_CANCELING_SPEAKERPHONE 0x0405
Telephony Terminal Types
#define	AUDIO_TE_TYPE_TELEPHONY_UNDEFINED 0x0500
#define	AUDIO_TE_TYPE_TELEPHONY_PHONE_LINE 0x0501
#define	AUDIO_TE_TYPE_TELEPHONY_TELEPHONE 0x0502
#define	AUDIO_TE_TYPE_TELEPHONY_DOWN_LINE_PHONE 0x0503
External Terminal Types
#define	AUDIO_TE_TYPE_EXTERNAL_UNDEFINED 0x0600
#define	AUDIO_TE_TYPE_EXTERNAL_ANALOG_CONNECTOR 0x0601
#define	AUDIO_TE_TYPE_EXTERNAL_DIGITAL_AUDIO_INTERFACE 0x0602
#define	AUDIO_TE_TYPE_EXTERNAL_LINE_CONNECTOR 0x0603
#define	AUDIO_TE_TYPE_EXTERNAL_LEGACY_AUDIO_CONNECTOR 0x0604
#define	AUDIO_TE_TYPE_EXTERNAL_S_PDIF_INTERFACE 0x0605
#define	AUDIO_TE_TYPE_EXTERNAL_1394_DA_STREAM 0x0606
#define	AUDIO_TE_TYPE_EXTERNAL_1394_DV_STREAM_SOUNDTRACK 0x0607
Embedded Function Terminal Types
#define	AUDIO_TE_TYPE_EMBEDDED_UNDEFINED 0x0700
#define	AUDIO_TE_TYPE_EMBEDDED_LEVEL_CALIBRATION_NOISE_SRC 0x0701
#define	AUDIO_TE_TYPE_EMBEDDED_EQUALIZATION NOISE 0x0702
#define	AUDIO_TE_TYPE_EMBEDDED_CD_PLAYER 0x0703
#define	AUDIO_TE_TYPE_EMBEDDED_DAT 0x0704
#define	AUDIO_TE_TYPE_EMBEDDED_DCC 0x0705
#define	AUDIO_TE_TYPE_EMBEDDED_MINIDISK 0x0706
#define	AUDIO_TE_TYPE_EMBEDDED_ANALOG_TAPE 0x0707
#define	AUDIO_TE_TYPE_EMBEDDED_PHONOGRAPH 0x0708
#define	AUDIO_TE_TYPE_EMBEDDED_VCR_AUDIO 0x0709
#define	AUDIO_TE_TYPE_EMBEDDED_VIDEO_DISC_AUDIO 0x070A
#define	AUDIO_TE_TYPE_EMBEDDED_DVD_AUDIO 0x070B
#define	AUDIO_TE_TYPE_EMBEDDED_TV_TUNER_AUDIO 0x070C
#define	AUDIO_TE_TYPE_EMBEDDED_SATELLITE_RECEIVER_AUDIO 0x070D
#define	AUDIO_TE_TYPE_EMBEDDED_CABLE_TUNER_AUDIO 0x070E
#define	AUDIO_TE_TYPE_EMBEDDED_DSS_AUDIO 0x070F
#define	AUDIO_TE_TYPE_EMBEDDED_RADIO_RECEIVER 0x0710
#define	AUDIO_TE_TYPE_EMBEDDED_RADIO_TRANSMITTER 0x0711
#define	AUDIO_TE_TYPE_EMBEDDED_MULTI_TRACK_RECORDER 0x0712
#define	AUDIO_TE_TYPE_EMBEDDED_SYNTHESIZER 0x0713
Format Type Codes
#define	AUDIO_FORMAT_TYPE_UNDEFINED 0x00
#define	AUDIO_FORMAT_TYPE_I 0x01
#define	AUDIO_FORMAT_TYPE_II 0x02
#define	AUDIO_FORMAT_TYPE_III 0x03
Audio Data Format Type I Codes
#define	AUDIO_FORMAT_TI_UNDEFINE 0x0000
#define	AUDIO_FORMAT_TI_PCM 0x0001
#define	AUDIO_FORMAT_TI_PCM8 0x0002
#define	AUDIO_FORMAT_TI_IEEE_FLOAT 0x0003
#define	AUDIO_FORMAT_TI_ALAW 0x0004
#define	AUDIO_FORMAT_TI_MULAW 0x0005
Audio Data Format Type II Codes
#define	AUDIO_FORMAT_TII_UNDEFINED 0x1000
#define	AUDIO_FORMAT_TII_MPEG 0x1001
#define	AUDIO_FORMAT_TII_AC_3 0x1002
Audio Data Format Type III Codes
#define	AUDIO_FORMAT_TIII_UNDEFINED 0x2000
#define	AUDIO_FORMAT_TIII_IEC1937_AC_3 0x2001
#define	AUDIO_FORMAT_TIII_IEC1937_MPEG1_L1 0x2002
#define	AUDIO_FORMAT_TIII_IEC1937_MPEG1_L2_3_OR_MP_2_NOEXT 0x2003
#define	AUDIO_FORMAT_TIII_IEC1937_MPEG2_EXT 0x2004
#define	AUDIO_FORMAT_TIII_IEC1937_MPEG2_L1_LS 0x2005
#define	AUDIO_FORMAT_TIII_IEC1937_MPEG2_L2_L3_LS 0x2006
MPEG Control Selectors
#define	AUDIO_FORMAT_CS_MP_UNDEFINED 0x00
#define	AUDIO_FORMAT_CS_MP_DUAL_CHANNEL 0x01
#define	AUDIO_FORMAT_CS_MP_SECOND_STEREO 0x02
#define	AUDIO_FORMAT_CS_MP_MULTILINGUAL 0x03
#define	AUDIO_FORMAT_CS_MP_DYN_RANGE 0x04
#define	AUDIO_FORMAT_CS_MP_SCALING 0x05
#define	AUDIO_FORMAT_CS_MP_HILO_SCALING 0x06
AC-3 Control Selectors
#define	AUDIO_FORMAT_CS_AC_CONTROL_UNDEFINED 0x00
#define	AUDIO_FORMAT_CS_AC_MODE 0x01
#define	AUDIO_FORMAT_CS_AC_DYN_RANGE 0x02
#define	AUDIO_FORMAT_CS_AC_SCALING 0x03
#define	AUDIO_FORMAT_CS_AC_HILO_SCALING 0x04
AudioControl & AudioStreaming setup requests
AudioControl requests : Terminal Control requests Mixer Unit Control requests Selector Unit Control requests Feature Unit Control requests Processing Unit Control requests Extension Unit Control requests AudioStreaming requests : Interface Control Requests
#define	SETUP_AUDIO_SET_CUR 0x01
#define	SETUP_AUDIO_SET_MIN 0x02
#define	SETUP_AUDIO_SET_MAX 0x03
#define	SETUP_AUDIO_SET_RES 0x04
#define	SETUP_AUDIO_GET_CUR 0x81
#define	SETUP_AUDIO_GET_MIN 0x82
#define	SETUP_AUDIO_GET_MAX 0x83
#define	SETUP_AUDIO_GET_RES 0x84
Additional setup Requests
Memory requests Get status requests
#define	SETUP_AUDIO_SET_MEM 0x05
#define	SETUP_AUDIO_GET_MEM 0x85
#define	SETUP_AUDIO_GET_STAT 0xFF
Control Selectors
#define	AUDIO_TE_CONTROL_CS_UNDEFINED 0x00
#define	AUDIO_TE_CONTROL_CS_COPY_PROTECT 0x01
The Copy Protect Control (AUDIO_TE_CONTROL_COPY_PROTECT) only supports the CUR attribute
#define	AUDIO_TE_CONTROL_CS_COPY_PROTECT_ATT_CPL0 0x00
#define	AUDIO_TE_CONTROL_CS_COPY_PROTECT_ATT_CPL1 0x01
#define	AUDIO_TE_CONTROL_CS_COPY_PROTECT_ATT_CPL2 0x02
Broadcast Channels (wValue)
#define	AUDIO_MIXER_CONTROL_IOCN_ALL_PROGRAM 0xFFFF
#define	AUDIO_MIXER_CONTROL_IOCN_ALL 0x0000
Control Selectors
#define	AUDIO_FU_CONTROL_CS_UNDEFINED 0x00
#define	AUDIO_FU_CONTROL_CS_MUTE 0x01
#define	AUDIO_FU_CONTROL_CS_VOLUME 0x02
#define	AUDIO_FU_CONTROL_CS_BASS 0x03
#define	AUDIO_FU_CONTROL_CS_MID 0x04
#define	AUDIO_FU_CONTROL_CS_TREBLE 0x05
#define	AUDIO_FU_CONTROL_CS_GRAPHIC_EQUALIZER 0x06
#define	AUDIO_FU_CONTROL_CS_AUTOMATIC_GAIN 0x07
#define	AUDIO_FU_CONTROL_CS_DELAY 0x08
#define	AUDIO_FU_CONTROL_CS_BASS_BOOST 0x09
#define	AUDIO_FU_CONTROL_CS_LOUDNESS 0x0A
Broadcast Channels (wValue)
#define	AUDIO_FU_CONTROL_CN_ALL 0xFF
Bands parameter for AUDIO_FU_CONTROL_CS_GRAPHIC_EQUALIZER
#define	AUDIO_FU_CONTROL_BAND_EQ_25Hz 0x00000001
#define	AUDIO_FU_CONTROL_BAND_EQ_31_5Hz 0x00000002
#define	AUDIO_FU_CONTROL_BAND_EQ_40Hz 0x00000004
#define	AUDIO_FU_CONTROL_BAND_EQ_50Hz 0x00000008
#define	AUDIO_FU_CONTROL_BAND_EQ_63Hz 0x00000010
#define	AUDIO_FU_CONTROL_BAND_EQ_80Hz 0x00000020
#define	AUDIO_FU_CONTROL_BAND_EQ_100Hz 0x00000040
#define	AUDIO_FU_CONTROL_BAND_EQ_125Hz 0x00000080
#define	AUDIO_FU_CONTROL_BAND_EQ_160Hz 0x00000100
#define	AUDIO_FU_CONTROL_BAND_EQ_200Hz 0x00000200
#define	AUDIO_FU_CONTROL_BAND_EQ_250Hz 0x00000400
#define	AUDIO_FU_CONTROL_BAND_EQ_315Hz 0x00000800
#define	AUDIO_FU_CONTROL_BAND_EQ_400Hz 0x00001000
#define	AUDIO_FU_CONTROL_BAND_EQ_500Hz 0x00002000
#define	AUDIO_FU_CONTROL_BAND_EQ_630Hz 0x00004000
#define	AUDIO_FU_CONTROL_BAND_EQ_800Hz 0x00008000
#define	AUDIO_FU_CONTROL_BAND_EQ_1000Hz 0x00010000
#define	AUDIO_FU_CONTROL_BAND_EQ_1250Hz 0x00020000
#define	AUDIO_FU_CONTROL_BAND_EQ_1600Hz 0x00040000
#define	AUDIO_FU_CONTROL_BAND_EQ_2000Hz 0x00080000
#define	AUDIO_FU_CONTROL_BAND_EQ_2500Hz 0x00100000
#define	AUDIO_FU_CONTROL_BAND_EQ_3150Hz 0x00200000
#define	AUDIO_FU_CONTROL_BAND_EQ_4000Hz 0x00400000
#define	AUDIO_FU_CONTROL_BAND_EQ_5000Hz 0x00800000
#define	AUDIO_FU_CONTROL_BAND_EQ_6300Hz 0x01000000
#define	AUDIO_FU_CONTROL_BAND_EQ_8000Hz 0x02000000
#define	AUDIO_FU_CONTROL_BAND_EQ_10000Hz 0x04000000
#define	AUDIO_FU_CONTROL_BAND_EQ_12500Hz 0x08000000
#define	AUDIO_FU_CONTROL_BAND_EQ_16000Hz 0x10000000
#define	AUDIO_FU_CONTROL_BAND_EQ_20000Hz 0x20000000
Bands parameter for AUDIO_FU_CONTROL_CS_DELAY
The settings for the CUR, MIN, MAX, and RES attributes can range from zero (0x0000) to 1023.9844ms (0xFFFF) in steps of 1/64 ms (0x0001).
#define	AUDIO_FU_CONTROL_DELAY_0MS 0x0000
#define	AUDIO_FU_CONTROL_DELAY_1MS 0x0040
#define	AUDIO_FU_CONTROL_DELAY_MAX 0xFFFF
Up/Down-mix Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_UD_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_UD_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_UD_MODE_SELECT 0x02
Dolby Prologic� Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_DP_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_DP_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_DP_MODE_SELECT 0x02
3D Stereo Extender Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_3D_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_3D_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_3D_SPACIOUSNESS 0x03
Reverberation Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_RV_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_RV_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_RV_LEVEL 0x02
#define	AUDIO_PU_CONTROL_CS_RV_TIME 0x03
#define	AUDIO_PU_CONTROL_CS_RV_FEEDBACK 0x04
Chorus Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_CH_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_CH_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_CH_LEVEL 0x02
#define	AUDIO_PU_CONTROL_CS_CH_RATE 0x03
#define	AUDIO_PU_CONTROL_CS_CH_DEPTH 0x04
Dynamic Range Compressor Processing Unit Control Selectors
#define	AUDIO_PU_CONTROL_CS_DR_UNDEFINED 0x00
#define	AUDIO_PU_CONTROL_CS_DR_ENABLE 0x01
#define	AUDIO_PU_CONTROL_CS_DR_COMPRESSION_RATE 0x02
#define	AUDIO_PU_CONTROL_CS_DR_MAXAMPL 0x03
#define	AUDIO_PU_CONTROL_CS_DR_THRESHOLD 0x04
#define	AUDIO_PU_CONTROL_CS_DR_ATTACK_TIME 0x05
#define	AUDIO_PU_CONTROL_CS_DR_RELEASE_TIME 0x06
bReverbType Parameter for AUDIO_PU_CONTROL_CS_RV_ENABLE Control Selectors
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_ROOM1 0
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_ROOM2 1
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_ROOM3 2
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_HALL1 3
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_HALL2 4
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_PLATE 5
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_DELAY 6
#define	AUDIO_PU_CONTROL_CS_RV_TYPE_PANNING_DELAY 7
Bands parameter for AUDIO_PU_CONTROL_CS_DR_RELEASE_TIME
The settings for the CUR, MIN, MAX, and RES attributes can range from zero (0x0000) to 255.9961 ms (0xFFFF) in steps of 1/256 ms or 0.00390625 ms (0x0001)
#define	AUDIO_PU_CONTROL_CS_DR_RELEASE_TIME_DELAY_0MS 0x0000
#define	AUDIO_PU_CONTROL_CS_DR_RELEASE_TIME_DELAY_MAX 0xFFFF
Control Selectors
#define	AUDIO_XU_CONTROL_CS_UNDEFINED 0x00
#define	AUDIO_XU_CONTROL_CS_ENABLE 0x01
Control Selectors
#define	AUDIO_EP_CONTROL_CS_UNDEFINED 0x00
#define	AUDIO_EP_CONTROL_CS_SAMPLING_FREQ 0x01
#define	AUDIO_EP_CONTROL_CS_PITCH 0x02
Level 16bits
Used in: Mixer Unit Control requests Feature Unit Control requests with AUDIO_FU_CONTROL_CS_VOLUME The settings for the CUR, MIN, and MAX attributes can range from +127.9961 dB (0x7FFF) down to -127.9961 dB (0x8001) in steps of 1/256 dB The range for the CUR attribute is extended by code 0x8000, representing silence, i.e., -� dB. The settings for the RES attribute can only take positive values and range from 1/256 dB (0x0001) to +127.9961 dB (0x7FFF).
#define	AUDIO_CONTROL_LEVEL16_DB_STEP (1L/256)
#define	AUDIO_CONTROL_LEVEL16_MAX 0x7FFF
#define	AUDIO_CONTROL_LEVEL16_1DB 0x0100
#define	AUDIO_CONTROL_LEVEL16_0DB 0x0000
#define	AUDIO_CONTROL_LEVEL16_M1DB 0xFE00
#define	AUDIO_CONTROL_LEVEL16_MIN 0x8001
#define	AUDIO_CONTROL_LEVEL16_MUTE 0x8000
Level 8bits
Used in: Feature Unit Control requests withAUDIO_FU_CONTROL_CS_BASS, _MID, _TREBLE The settings for the CUR, MIN, and MAX attributes can range from +31.75 dB (0x7F) down to �32.00 dB (0x80) in steps of 0.25 dB (0x01) The settings for the RES attribute can only take positive values and range from 0.25 dB (0x01) to +31.75 dB (0x7F)
#define	AUDIO_CONTROL_LEVEL8_MAX 0x7F
#define	AUDIO_CONTROL_LEVEL8_0DB 0x00
#define	AUDIO_CONTROL_LEVEL8_MIN 0x80