root/include/uapi/linux/usb/audio.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. uac_mixer_unit_bNrChannels
  2. uac_mixer_unit_wChannelConfig
  3. uac_mixer_unit_iChannelNames
  4. uac_mixer_unit_bmControls
  5. uac_mixer_unit_iMixer
  6. uac_selector_unit_iSelector
  7. uac_feature_unit_iFeature
  8. uac_processing_unit_bNrChannels
  9. uac_processing_unit_wChannelConfig
  10. uac_processing_unit_iChannelNames
  11. uac_processing_unit_bControlSize
  12. uac_processing_unit_bmControls
  13. uac_processing_unit_iProcessing
  14. uac_processing_unit_specific
/*
 * <linux/usb/audio.h> -- USB Audio definitions.
 *
 * Copyright (C) 2006 Thumtronics Pty Ltd.
 * Developed for Thumtronics by Grey Innovation
 * Ben Williamson <ben.williamson@greyinnovation.com>
 *
 * This software is distributed under the terms of the GNU General Public
 * License ("GPL") version 2, as published by the Free Software Foundation.
 *
 * This file holds USB constants and structures defined
 * by the USB Device Class Definition for Audio Devices.
 * Comments below reference relevant sections of that document:
 *
 * http://www.usb.org/developers/devclass_docs/audio10.pdf
 *
 * Types and defines in this file are either specific to version 1.0 of
 * this standard or common for newer versions.
 */

#ifndef _UAPI__LINUX_USB_AUDIO_H
#define _UAPI__LINUX_USB_AUDIO_H

#include <linux/types.h>

/* bInterfaceProtocol values to denote the version of the standard used */
#define UAC_VERSION_1                   0x00
#define UAC_VERSION_2                   0x20

/* A.2 Audio Interface Subclass Codes */
#define USB_SUBCLASS_AUDIOCONTROL       0x01
#define USB_SUBCLASS_AUDIOSTREAMING     0x02
#define USB_SUBCLASS_MIDISTREAMING      0x03

/* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
#define UAC_HEADER                      0x01
#define UAC_INPUT_TERMINAL              0x02
#define UAC_OUTPUT_TERMINAL             0x03
#define UAC_MIXER_UNIT                  0x04
#define UAC_SELECTOR_UNIT               0x05
#define UAC_FEATURE_UNIT                0x06
#define UAC1_PROCESSING_UNIT            0x07
#define UAC1_EXTENSION_UNIT             0x08

/* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
#define UAC_AS_GENERAL                  0x01
#define UAC_FORMAT_TYPE                 0x02
#define UAC_FORMAT_SPECIFIC             0x03

/* A.7 Processing Unit Process Types */
#define UAC_PROCESS_UNDEFINED           0x00
#define UAC_PROCESS_UP_DOWNMIX          0x01
#define UAC_PROCESS_DOLBY_PROLOGIC      0x02
#define UAC_PROCESS_STEREO_EXTENDER     0x03
#define UAC_PROCESS_REVERB              0x04
#define UAC_PROCESS_CHORUS              0x05
#define UAC_PROCESS_DYN_RANGE_COMP      0x06

/* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
#define UAC_EP_GENERAL                  0x01

/* A.9 Audio Class-Specific Request Codes */
#define UAC_SET_                        0x00
#define UAC_GET_                        0x80

#define UAC__CUR                        0x1
#define UAC__MIN                        0x2
#define UAC__MAX                        0x3
#define UAC__RES                        0x4
#define UAC__MEM                        0x5

#define UAC_SET_CUR                     (UAC_SET_ | UAC__CUR)
#define UAC_GET_CUR                     (UAC_GET_ | UAC__CUR)
#define UAC_SET_MIN                     (UAC_SET_ | UAC__MIN)
#define UAC_GET_MIN                     (UAC_GET_ | UAC__MIN)
#define UAC_SET_MAX                     (UAC_SET_ | UAC__MAX)
#define UAC_GET_MAX                     (UAC_GET_ | UAC__MAX)
#define UAC_SET_RES                     (UAC_SET_ | UAC__RES)
#define UAC_GET_RES                     (UAC_GET_ | UAC__RES)
#define UAC_SET_MEM                     (UAC_SET_ | UAC__MEM)
#define UAC_GET_MEM                     (UAC_GET_ | UAC__MEM)

#define UAC_GET_STAT                    0xff

/* A.10 Control Selector Codes */

/* A.10.1 Terminal Control Selectors */
#define UAC_TERM_COPY_PROTECT           0x01

/* A.10.2 Feature Unit Control Selectors */
#define UAC_FU_MUTE                     0x01
#define UAC_FU_VOLUME                   0x02
#define UAC_FU_BASS                     0x03
#define UAC_FU_MID                      0x04
#define UAC_FU_TREBLE                   0x05
#define UAC_FU_GRAPHIC_EQUALIZER        0x06
#define UAC_FU_AUTOMATIC_GAIN           0x07
#define UAC_FU_DELAY                    0x08
#define UAC_FU_BASS_BOOST               0x09
#define UAC_FU_LOUDNESS                 0x0a

#define UAC_CONTROL_BIT(CS)     (1 << ((CS) - 1))

/* A.10.3.1 Up/Down-mix Processing Unit Controls Selectors */
#define UAC_UD_ENABLE                   0x01
#define UAC_UD_MODE_SELECT              0x02

/* A.10.3.2 Dolby Prologic (tm) Processing Unit Controls Selectors */
#define UAC_DP_ENABLE                   0x01
#define UAC_DP_MODE_SELECT              0x02

/* A.10.3.3 3D Stereo Extender Processing Unit Control Selectors */
#define UAC_3D_ENABLE                   0x01
#define UAC_3D_SPACE                    0x02

/* A.10.3.4 Reverberation Processing Unit Control Selectors */
#define UAC_REVERB_ENABLE               0x01
#define UAC_REVERB_LEVEL                0x02
#define UAC_REVERB_TIME                 0x03
#define UAC_REVERB_FEEDBACK             0x04

/* A.10.3.5 Chorus Processing Unit Control Selectors */
#define UAC_CHORUS_ENABLE               0x01
#define UAC_CHORUS_LEVEL                0x02
#define UAC_CHORUS_RATE                 0x03
#define UAC_CHORUS_DEPTH                0x04

/* A.10.3.6 Dynamic Range Compressor Unit Control Selectors */
#define UAC_DCR_ENABLE                  0x01
#define UAC_DCR_RATE                    0x02
#define UAC_DCR_MAXAMPL                 0x03
#define UAC_DCR_THRESHOLD               0x04
#define UAC_DCR_ATTACK_TIME             0x05
#define UAC_DCR_RELEASE_TIME            0x06

/* A.10.4 Extension Unit Control Selectors */
#define UAC_XU_ENABLE                   0x01

/* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */
#define UAC_MS_HEADER                   0x01
#define UAC_MIDI_IN_JACK                0x02
#define UAC_MIDI_OUT_JACK               0x03

/* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
#define UAC_MS_GENERAL                  0x01

/* Terminals - 2.1 USB Terminal Types */
#define UAC_TERMINAL_UNDEFINED          0x100
#define UAC_TERMINAL_STREAMING          0x101
#define UAC_TERMINAL_VENDOR_SPEC        0x1FF

/* Terminal Control Selectors */
/* 4.3.2  Class-Specific AC Interface Descriptor */
struct uac1_ac_header_descriptor {
        __u8  bLength;                  /* 8 + n */
        __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
        __u8  bDescriptorSubtype;       /* UAC_MS_HEADER */
        __le16 bcdADC;                  /* 0x0100 */
        __le16 wTotalLength;            /* includes Unit and Terminal desc. */
        __u8  bInCollection;            /* n */
        __u8  baInterfaceNr[];          /* [n] */
} __attribute__ ((packed));

#define UAC_DT_AC_HEADER_SIZE(n)        (8 + (n))

/* As above, but more useful for defining your own descriptors: */
#define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n)                     \
struct uac1_ac_header_descriptor_##n {                  \
        __u8  bLength;                                          \
        __u8  bDescriptorType;                                  \
        __u8  bDescriptorSubtype;                               \
        __le16 bcdADC;                                          \
        __le16 wTotalLength;                                    \
        __u8  bInCollection;                                    \
        __u8  baInterfaceNr[n];                                 \
} __attribute__ ((packed))

/* 4.3.2.1 Input Terminal Descriptor */
struct uac_input_terminal_descriptor {
        __u8  bLength;                  /* in bytes: 12 */
        __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
        __u8  bDescriptorSubtype;       /* INPUT_TERMINAL descriptor subtype */
        __u8  bTerminalID;              /* Constant uniquely terminal ID */
        __le16 wTerminalType;           /* USB Audio Terminal Types */
        __u8  bAssocTerminal;           /* ID of the Output Terminal associated */
        __u8  bNrChannels;              /* Number of logical output channels */
        __le16 wChannelConfig;
        __u8  iChannelNames;
        __u8  iTerminal;
} __attribute__ ((packed));

#define UAC_DT_INPUT_TERMINAL_SIZE                      12

/* Terminals - 2.2 Input Terminal Types */
#define UAC_INPUT_TERMINAL_UNDEFINED                    0x200
#define UAC_INPUT_TERMINAL_MICROPHONE                   0x201
#define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE           0x202
#define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE          0x203
#define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE          0x204
#define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY             0x205
#define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY        0x206

/* Terminals - control selectors */

#define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL            0x01

/* 4.3.2.2 Output Terminal Descriptor */
struct uac1_output_terminal_descriptor {
        __u8  bLength;                  /* in bytes: 9 */
        __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
        __u8  bDescriptorSubtype;       /* OUTPUT_TERMINAL descriptor subtype */
        __u8  bTerminalID;              /* Constant uniquely terminal ID */
        __le16 wTerminalType;           /* USB Audio Terminal Types */
        __u8  bAssocTerminal;           /* ID of the Input Terminal associated */
        __u8  bSourceID;                /* ID of the connected Unit or Terminal*/
        __u8  iTerminal;
} __attribute__ ((packed));

#define UAC_DT_OUTPUT_TERMINAL_SIZE                     9

/* Terminals - 2.3 Output Terminal Types */
#define UAC_OUTPUT_TERMINAL_UNDEFINED                   0x300
#define UAC_OUTPUT_TERMINAL_SPEAKER                     0x301
#define UAC_OUTPUT_TERMINAL_HEADPHONES                  0x302
#define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO  0x303
#define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER             0x304
#define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER                0x305
#define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER       0x306
#define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER    0x307

/* Set bControlSize = 2 as default setting */
#define UAC_DT_FEATURE_UNIT_SIZE(ch)            (7 + ((ch) + 1) * 2)

/* As above, but more useful for defining your own descriptors: */
#define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch)                 \
struct uac_feature_unit_descriptor_##ch {                       \
        __u8  bLength;                                          \
        __u8  bDescriptorType;                                  \
        __u8  bDescriptorSubtype;                               \
        __u8  bUnitID;                                          \
        __u8  bSourceID;                                        \
        __u8  bControlSize;                                     \
        __le16 bmaControls[ch + 1];                             \
        __u8  iFeature;                                         \
} __attribute__ ((packed))

/* 4.3.2.3 Mixer Unit Descriptor */
struct uac_mixer_unit_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bUnitID;
        __u8 bNrInPins;
        __u8 baSourceID[];
} __attribute__ ((packed));

static inline __u8 uac_mixer_unit_bNrChannels(struct uac_mixer_unit_descriptor *desc)
{
        return desc->baSourceID[desc->bNrInPins];
}

static inline __u32 uac_mixer_unit_wChannelConfig(struct uac_mixer_unit_descriptor *desc,
                                                  int protocol)
{
        if (protocol == UAC_VERSION_1)
                return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
                        desc->baSourceID[desc->bNrInPins + 1];
        else
                return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
                        (desc->baSourceID[desc->bNrInPins + 3] << 16) |
                        (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
                        (desc->baSourceID[desc->bNrInPins + 1]);
}

static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor *desc,
                                                int protocol)
{
        return (protocol == UAC_VERSION_1) ?
                desc->baSourceID[desc->bNrInPins + 3] :
                desc->baSourceID[desc->bNrInPins + 5];
}

static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc,
                                              int protocol)
{
        return (protocol == UAC_VERSION_1) ?
                &desc->baSourceID[desc->bNrInPins + 4] :
                &desc->baSourceID[desc->bNrInPins + 6];
}

static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc)
{
        __u8 *raw = (__u8 *) desc;
        return raw[desc->bLength - 1];
}

/* 4.3.2.4 Selector Unit Descriptor */
struct uac_selector_unit_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bUintID;
        __u8 bNrInPins;
        __u8 baSourceID[];
} __attribute__ ((packed));

static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc)
{
        __u8 *raw = (__u8 *) desc;
        return raw[desc->bLength - 1];
}

/* 4.3.2.5 Feature Unit Descriptor */
struct uac_feature_unit_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bUnitID;
        __u8 bSourceID;
        __u8 bControlSize;
        __u8 bmaControls[0]; /* variable length */
} __attribute__((packed));

static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc)
{
        __u8 *raw = (__u8 *) desc;
        return raw[desc->bLength - 1];
}

/* 4.3.2.6 Processing Unit Descriptors */
struct uac_processing_unit_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bUnitID;
        __u16 wProcessType;
        __u8 bNrInPins;
        __u8 baSourceID[];
} __attribute__ ((packed));

static inline __u8 uac_processing_unit_bNrChannels(struct uac_processing_unit_descriptor *desc)
{
        return desc->baSourceID[desc->bNrInPins];
}

static inline __u32 uac_processing_unit_wChannelConfig(struct uac_processing_unit_descriptor *desc,
                                                       int protocol)
{
        if (protocol == UAC_VERSION_1)
                return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
                        desc->baSourceID[desc->bNrInPins + 1];
        else
                return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
                        (desc->baSourceID[desc->bNrInPins + 3] << 16) |
                        (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
                        (desc->baSourceID[desc->bNrInPins + 1]);
}

static inline __u8 uac_processing_unit_iChannelNames(struct uac_processing_unit_descriptor *desc,
                                                     int protocol)
{
        return (protocol == UAC_VERSION_1) ?
                desc->baSourceID[desc->bNrInPins + 3] :
                desc->baSourceID[desc->bNrInPins + 5];
}

static inline __u8 uac_processing_unit_bControlSize(struct uac_processing_unit_descriptor *desc,
                                                    int protocol)
{
        return (protocol == UAC_VERSION_1) ?
                desc->baSourceID[desc->bNrInPins + 4] :
                desc->baSourceID[desc->bNrInPins + 6];
}

static inline __u8 *uac_processing_unit_bmControls(struct uac_processing_unit_descriptor *desc,
                                                   int protocol)
{
        return (protocol == UAC_VERSION_1) ?
                &desc->baSourceID[desc->bNrInPins + 5] :
                &desc->baSourceID[desc->bNrInPins + 7];
}

static inline __u8 uac_processing_unit_iProcessing(struct uac_processing_unit_descriptor *desc,
                                                   int protocol)
{
        __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
        return *(uac_processing_unit_bmControls(desc, protocol)
                        + control_size);
}

static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_descriptor *desc,
                                                 int protocol)
{
        __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
        return uac_processing_unit_bmControls(desc, protocol)
                        + control_size + 1;
}

/* 4.5.2 Class-Specific AS Interface Descriptor */
struct uac1_as_header_descriptor {
        __u8  bLength;                  /* in bytes: 7 */
        __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
        __u8  bDescriptorSubtype;       /* AS_GENERAL */
        __u8  bTerminalLink;            /* Terminal ID of connected Terminal */
        __u8  bDelay;                   /* Delay introduced by the data path */
        __le16 wFormatTag;              /* The Audio Data Format */
} __attribute__ ((packed));

#define UAC_DT_AS_HEADER_SIZE           7

/* Formats - A.1.1 Audio Data Format Type I Codes */
#define UAC_FORMAT_TYPE_I_UNDEFINED     0x0
#define UAC_FORMAT_TYPE_I_PCM           0x1
#define UAC_FORMAT_TYPE_I_PCM8          0x2
#define UAC_FORMAT_TYPE_I_IEEE_FLOAT    0x3
#define UAC_FORMAT_TYPE_I_ALAW          0x4
#define UAC_FORMAT_TYPE_I_MULAW         0x5

struct uac_format_type_i_continuous_descriptor {
        __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
        __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
        __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
        __u8  bFormatType;              /* FORMAT_TYPE_1 */
        __u8  bNrChannels;              /* physical channels in the stream */
        __u8  bSubframeSize;            /* */
        __u8  bBitResolution;
        __u8  bSamFreqType;
        __u8  tLowerSamFreq[3];
        __u8  tUpperSamFreq[3];
} __attribute__ ((packed));

#define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE  14

struct uac_format_type_i_discrete_descriptor {
        __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
        __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
        __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
        __u8  bFormatType;              /* FORMAT_TYPE_1 */
        __u8  bNrChannels;              /* physical channels in the stream */
        __u8  bSubframeSize;            /* */
        __u8  bBitResolution;
        __u8  bSamFreqType;
        __u8  tSamFreq[][3];
} __attribute__ ((packed));

#define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n)              \
struct uac_format_type_i_discrete_descriptor_##n {              \
        __u8  bLength;                                          \
        __u8  bDescriptorType;                                  \
        __u8  bDescriptorSubtype;                               \
        __u8  bFormatType;                                      \
        __u8  bNrChannels;                                      \
        __u8  bSubframeSize;                                    \
        __u8  bBitResolution;                                   \
        __u8  bSamFreqType;                                     \
        __u8  tSamFreq[n][3];                                   \
} __attribute__ ((packed))

#define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))

struct uac_format_type_i_ext_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bFormatType;
        __u8 bSubslotSize;
        __u8 bBitResolution;
        __u8 bHeaderLength;
        __u8 bControlSize;
        __u8 bSideBandProtocol;
} __attribute__((packed));

/* Formats - Audio Data Format Type I Codes */

#define UAC_FORMAT_TYPE_II_MPEG 0x1001
#define UAC_FORMAT_TYPE_II_AC3  0x1002

struct uac_format_type_ii_discrete_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bFormatType;
        __le16 wMaxBitRate;
        __le16 wSamplesPerFrame;
        __u8 bSamFreqType;
        __u8 tSamFreq[][3];
} __attribute__((packed));

struct uac_format_type_ii_ext_descriptor {
        __u8 bLength;
        __u8 bDescriptorType;
        __u8 bDescriptorSubtype;
        __u8 bFormatType;
        __u16 wMaxBitRate;
        __u16 wSamplesPerFrame;
        __u8 bHeaderLength;
        __u8 bSideBandProtocol;
} __attribute__((packed));

/* type III */
#define UAC_FORMAT_TYPE_III_IEC1937_AC3 0x2001
#define UAC_FORMAT_TYPE_III_IEC1937_MPEG1_LAYER1        0x2002
#define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_NOEXT 0x2003
#define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_EXT   0x2004
#define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER1_LS     0x2005
#define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER23_LS    0x2006

/* Formats - A.2 Format Type Codes */
#define UAC_FORMAT_TYPE_UNDEFINED       0x0
#define UAC_FORMAT_TYPE_I               0x1
#define UAC_FORMAT_TYPE_II              0x2
#define UAC_FORMAT_TYPE_III             0x3
#define UAC_EXT_FORMAT_TYPE_I           0x81
#define UAC_EXT_FORMAT_TYPE_II          0x82
#define UAC_EXT_FORMAT_TYPE_III         0x83

struct uac_iso_endpoint_descriptor {
        __u8  bLength;                  /* in bytes: 7 */
        __u8  bDescriptorType;          /* USB_DT_CS_ENDPOINT */
        __u8  bDescriptorSubtype;       /* EP_GENERAL */
        __u8  bmAttributes;
        __u8  bLockDelayUnits;
        __le16 wLockDelay;
} __attribute__((packed));
#define UAC_ISO_ENDPOINT_DESC_SIZE      7

#define UAC_EP_CS_ATTR_SAMPLE_RATE      0x01
#define UAC_EP_CS_ATTR_PITCH_CONTROL    0x02
#define UAC_EP_CS_ATTR_FILL_MAX         0x80

/* status word format (3.7.1.1) */

#define UAC1_STATUS_TYPE_ORIG_MASK              0x0f
#define UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF  0x0
#define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_IF   0x1
#define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_EP   0x2

#define UAC1_STATUS_TYPE_IRQ_PENDING            (1 << 7)
#define UAC1_STATUS_TYPE_MEM_CHANGED            (1 << 6)

struct uac1_status_word {
        __u8 bStatusType;
        __u8 bOriginator;
} __attribute__((packed));


#endif /* _UAPI__LINUX_USB_AUDIO_H */
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