include/uapi/linux/usb/audio.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * <linux/usb/audio.h> -- USB Audio definitions.
   4  *
   5  * Copyright (C) 2006 Thumtronics Pty Ltd.
   6  * Developed for Thumtronics by Grey Innovation
   7  * Ben Williamson <ben.williamson@greyinnovation.com>
   8  *
   9  * This software is distributed under the terms of the GNU General Public
  10  * License ("GPL") version 2, as published by the Free Software Foundation.
  11  *
  12  * This file holds USB constants and structures defined
  13  * by the USB Device Class Definition for Audio Devices.
  14  * Comments below reference relevant sections of that document:
  15  *
  16  * http://www.usb.org/developers/devclass_docs/audio10.pdf
  17  *
  18  * Types and defines in this file are either specific to version 1.0 of
  19  * this standard or common for newer versions.
  20  */
  21
  22 #ifndef _UAPI__LINUX_USB_AUDIO_H
  23 #define _UAPI__LINUX_USB_AUDIO_H
  24
  25 #include <linux/types.h>
  26
  27 /* bInterfaceProtocol values to denote the version of the standard used */
  28 #define UAC_VERSION_1                   0x00
  29 #define UAC_VERSION_2                   0x20
  30
  31 /* A.2 Audio Interface Subclass Codes */
  32 #define USB_SUBCLASS_AUDIOCONTROL       0x01
  33 #define USB_SUBCLASS_AUDIOSTREAMING     0x02
  34 #define USB_SUBCLASS_MIDISTREAMING      0x03
  35
  36 /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
  37 #define UAC_HEADER                      0x01
  38 #define UAC_INPUT_TERMINAL              0x02
  39 #define UAC_OUTPUT_TERMINAL             0x03
  40 #define UAC_MIXER_UNIT                  0x04
  41 #define UAC_SELECTOR_UNIT               0x05
  42 #define UAC_FEATURE_UNIT                0x06
  43 #define UAC1_PROCESSING_UNIT            0x07
  44 #define UAC1_EXTENSION_UNIT             0x08
  45
  46 /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
  47 #define UAC_AS_GENERAL                  0x01
  48 #define UAC_FORMAT_TYPE                 0x02
  49 #define UAC_FORMAT_SPECIFIC             0x03
  50
  51 /* A.7 Processing Unit Process Types */
  52 #define UAC_PROCESS_UNDEFINED           0x00
  53 #define UAC_PROCESS_UP_DOWNMIX          0x01
  54 #define UAC_PROCESS_DOLBY_PROLOGIC      0x02
  55 #define UAC_PROCESS_STEREO_EXTENDER     0x03
  56 #define UAC_PROCESS_REVERB              0x04
  57 #define UAC_PROCESS_CHORUS              0x05
  58 #define UAC_PROCESS_DYN_RANGE_COMP      0x06
  59
  60 /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
  61 #define UAC_EP_GENERAL                  0x01
  62
  63 /* A.9 Audio Class-Specific Request Codes */
  64 #define UAC_SET_                        0x00
  65 #define UAC_GET_                        0x80
  66
  67 #define UAC__CUR                        0x1
  68 #define UAC__MIN                        0x2
  69 #define UAC__MAX                        0x3
  70 #define UAC__RES                        0x4
  71 #define UAC__MEM                        0x5
  72
  73 #define UAC_SET_CUR                     (UAC_SET_ | UAC__CUR)
  74 #define UAC_GET_CUR                     (UAC_GET_ | UAC__CUR)
  75 #define UAC_SET_MIN                     (UAC_SET_ | UAC__MIN)
  76 #define UAC_GET_MIN                     (UAC_GET_ | UAC__MIN)
  77 #define UAC_SET_MAX                     (UAC_SET_ | UAC__MAX)
  78 #define UAC_GET_MAX                     (UAC_GET_ | UAC__MAX)
  79 #define UAC_SET_RES                     (UAC_SET_ | UAC__RES)
  80 #define UAC_GET_RES                     (UAC_GET_ | UAC__RES)
  81 #define UAC_SET_MEM                     (UAC_SET_ | UAC__MEM)
  82 #define UAC_GET_MEM                     (UAC_GET_ | UAC__MEM)
  83
  84 #define UAC_GET_STAT                    0xff
  85
  86 /* A.10 Control Selector Codes */
  87
  88 /* A.10.1 Terminal Control Selectors */
  89 #define UAC_TERM_COPY_PROTECT           0x01
  90
  91 /* A.10.2 Feature Unit Control Selectors */
  92 #define UAC_FU_MUTE                     0x01
  93 #define UAC_FU_VOLUME                   0x02
  94 #define UAC_FU_BASS                     0x03
  95 #define UAC_FU_MID                      0x04
  96 #define UAC_FU_TREBLE                   0x05
  97 #define UAC_FU_GRAPHIC_EQUALIZER        0x06
  98 #define UAC_FU_AUTOMATIC_GAIN           0x07
  99 #define UAC_FU_DELAY                    0x08
 100 #define UAC_FU_BASS_BOOST               0x09
 101 #define UAC_FU_LOUDNESS                 0x0a
 102
 103 #define UAC_CONTROL_BIT(CS)     (1 << ((CS) - 1))
 104
 105 /* A.10.3.1 Up/Down-mix Processing Unit Controls Selectors */
 106 #define UAC_UD_ENABLE                   0x01
 107 #define UAC_UD_MODE_SELECT              0x02
 108
 109 /* A.10.3.2 Dolby Prologic (tm) Processing Unit Controls Selectors */
 110 #define UAC_DP_ENABLE                   0x01
 111 #define UAC_DP_MODE_SELECT              0x02
 112
 113 /* A.10.3.3 3D Stereo Extender Processing Unit Control Selectors */
 114 #define UAC_3D_ENABLE                   0x01
 115 #define UAC_3D_SPACE                    0x02
 116
 117 /* A.10.3.4 Reverberation Processing Unit Control Selectors */
 118 #define UAC_REVERB_ENABLE               0x01
 119 #define UAC_REVERB_LEVEL                0x02
 120 #define UAC_REVERB_TIME                 0x03
 121 #define UAC_REVERB_FEEDBACK             0x04
 122
 123 /* A.10.3.5 Chorus Processing Unit Control Selectors */
 124 #define UAC_CHORUS_ENABLE               0x01
 125 #define UAC_CHORUS_LEVEL                0x02
 126 #define UAC_CHORUS_RATE                 0x03
 127 #define UAC_CHORUS_DEPTH                0x04
 128
 129 /* A.10.3.6 Dynamic Range Compressor Unit Control Selectors */
 130 #define UAC_DCR_ENABLE                  0x01
 131 #define UAC_DCR_RATE                    0x02
 132 #define UAC_DCR_MAXAMPL                 0x03
 133 #define UAC_DCR_THRESHOLD               0x04
 134 #define UAC_DCR_ATTACK_TIME             0x05
 135 #define UAC_DCR_RELEASE_TIME            0x06
 136
 137 /* A.10.4 Extension Unit Control Selectors */
 138 #define UAC_XU_ENABLE                   0x01
 139
 140 /* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */
 141 #define UAC_MS_HEADER                   0x01
 142 #define UAC_MIDI_IN_JACK                0x02
 143 #define UAC_MIDI_OUT_JACK               0x03
 144
 145 /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
 146 #define UAC_MS_GENERAL                  0x01
 147
 148 /* Terminals - 2.1 USB Terminal Types */
 149 #define UAC_TERMINAL_UNDEFINED          0x100
 150 #define UAC_TERMINAL_STREAMING          0x101
 151 #define UAC_TERMINAL_VENDOR_SPEC        0x1FF
 152
 153 /* Terminal Control Selectors */
 154 /* 4.3.2  Class-Specific AC Interface Descriptor */
 155 struct uac1_ac_header_descriptor {
 156         __u8  bLength;                  /* 8 + n */
 157         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 158         __u8  bDescriptorSubtype;       /* UAC_MS_HEADER */
 159         __le16 bcdADC;                  /* 0x0100 */
 160         __le16 wTotalLength;            /* includes Unit and Terminal desc. */
 161         __u8  bInCollection;            /* n */
 162         __u8  baInterfaceNr[];          /* [n] */
 163 } __attribute__ ((packed));
 164
 165 #define UAC_DT_AC_HEADER_SIZE(n)        (8 + (n))
 166
 167 /* As above, but more useful for defining your own descriptors: */
 168 #define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n)                     \
 169 struct uac1_ac_header_descriptor_##n {                  \
 170         __u8  bLength;                                          \
 171         __u8  bDescriptorType;                                  \
 172         __u8  bDescriptorSubtype;                               \
 173         __le16 bcdADC;                                          \
 174         __le16 wTotalLength;                                    \
 175         __u8  bInCollection;                                    \
 176         __u8  baInterfaceNr[n];                                 \
 177 } __attribute__ ((packed))
 178
 179 /* 4.3.2.1 Input Terminal Descriptor */
 180 struct uac_input_terminal_descriptor {
 181         __u8  bLength;                  /* in bytes: 12 */
 182         __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
 183         __u8  bDescriptorSubtype;       /* INPUT_TERMINAL descriptor subtype */
 184         __u8  bTerminalID;              /* Constant uniquely terminal ID */
 185         __le16 wTerminalType;           /* USB Audio Terminal Types */
 186         __u8  bAssocTerminal;           /* ID of the Output Terminal associated */
 187         __u8  bNrChannels;              /* Number of logical output channels */
 188         __le16 wChannelConfig;
 189         __u8  iChannelNames;
 190         __u8  iTerminal;
 191 } __attribute__ ((packed));
 192
 193 #define UAC_DT_INPUT_TERMINAL_SIZE                      12
 194
 195 /* Terminals - 2.2 Input Terminal Types */
 196 #define UAC_INPUT_TERMINAL_UNDEFINED                    0x200
 197 #define UAC_INPUT_TERMINAL_MICROPHONE                   0x201
 198 #define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE           0x202
 199 #define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE          0x203
 200 #define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE          0x204
 201 #define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY             0x205
 202 #define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY        0x206
 203
 204 /* Terminals - control selectors */
 205
 206 #define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL            0x01
 207
 208 /* 4.3.2.2 Output Terminal Descriptor */
 209 struct uac1_output_terminal_descriptor {
 210         __u8  bLength;                  /* in bytes: 9 */
 211         __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
 212         __u8  bDescriptorSubtype;       /* OUTPUT_TERMINAL descriptor subtype */
 213         __u8  bTerminalID;              /* Constant uniquely terminal ID */
 214         __le16 wTerminalType;           /* USB Audio Terminal Types */
 215         __u8  bAssocTerminal;           /* ID of the Input Terminal associated */
 216         __u8  bSourceID;                /* ID of the connected Unit or Terminal*/
 217         __u8  iTerminal;
 218 } __attribute__ ((packed));
 219
 220 #define UAC_DT_OUTPUT_TERMINAL_SIZE                     9
 221
 222 /* Terminals - 2.3 Output Terminal Types */
 223 #define UAC_OUTPUT_TERMINAL_UNDEFINED                   0x300
 224 #define UAC_OUTPUT_TERMINAL_SPEAKER                     0x301
 225 #define UAC_OUTPUT_TERMINAL_HEADPHONES                  0x302
 226 #define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO  0x303
 227 #define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER             0x304
 228 #define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER                0x305
 229 #define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER       0x306
 230 #define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER    0x307
 231
 232 /* Set bControlSize = 2 as default setting */
 233 #define UAC_DT_FEATURE_UNIT_SIZE(ch)            (7 + ((ch) + 1) * 2)
 234
 235 /* As above, but more useful for defining your own descriptors: */
 236 #define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch)                 \
 237 struct uac_feature_unit_descriptor_##ch {                       \
 238         __u8  bLength;                                          \
 239         __u8  bDescriptorType;                                  \
 240         __u8  bDescriptorSubtype;                               \
 241         __u8  bUnitID;                                          \
 242         __u8  bSourceID;                                        \
 243         __u8  bControlSize;                                     \
 244         __le16 bmaControls[ch + 1];                             \
 245         __u8  iFeature;                                         \
 246 } __attribute__ ((packed))
 247
 248 /* 4.3.2.3 Mixer Unit Descriptor */
 249 struct uac_mixer_unit_descriptor {
 250         __u8 bLength;
 251         __u8 bDescriptorType;
 252         __u8 bDescriptorSubtype;
 253         __u8 bUnitID;
 254         __u8 bNrInPins;
 255         __u8 baSourceID[];
 256 } __attribute__ ((packed));
 257
 258 static inline __u8 uac_mixer_unit_bNrChannels(struct uac_mixer_unit_descriptor *desc)
 259 {
 260         return desc->baSourceID[desc->bNrInPins];
 261 }
 262
 263 static inline __u32 uac_mixer_unit_wChannelConfig(struct uac_mixer_unit_descriptor *desc,
 264                                                   int protocol)
 265 {
 266         if (protocol == UAC_VERSION_1)
 267                 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
 268                         desc->baSourceID[desc->bNrInPins + 1];
 269         else
 270                 return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
 271                         (desc->baSourceID[desc->bNrInPins + 3] << 16) |
 272                         (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
 273                         (desc->baSourceID[desc->bNrInPins + 1]);
 274 }
 275
 276 static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor *desc,
 277                                                 int protocol)
 278 {
 279         return (protocol == UAC_VERSION_1) ?
 280                 desc->baSourceID[desc->bNrInPins + 3] :
 281                 desc->baSourceID[desc->bNrInPins + 5];
 282 }
 283
 284 static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc,
 285                                               int protocol)
 286 {
 287         return (protocol == UAC_VERSION_1) ?
 288                 &desc->baSourceID[desc->bNrInPins + 4] :
 289                 &desc->baSourceID[desc->bNrInPins + 6];
 290 }
 291
 292 static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc)
 293 {
 294         __u8 *raw = (__u8 *) desc;
 295         return raw[desc->bLength - 1];
 296 }
 297
 298 /* 4.3.2.4 Selector Unit Descriptor */
 299 struct uac_selector_unit_descriptor {
 300         __u8 bLength;
 301         __u8 bDescriptorType;
 302         __u8 bDescriptorSubtype;
 303         __u8 bUintID;
 304         __u8 bNrInPins;
 305         __u8 baSourceID[];
 306 } __attribute__ ((packed));
 307
 308 static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc)
 309 {
 310         __u8 *raw = (__u8 *) desc;
 311         return raw[desc->bLength - 1];
 312 }
 313
 314 /* 4.3.2.5 Feature Unit Descriptor */
 315 struct uac_feature_unit_descriptor {
 316         __u8 bLength;
 317         __u8 bDescriptorType;
 318         __u8 bDescriptorSubtype;
 319         __u8 bUnitID;
 320         __u8 bSourceID;
 321         __u8 bControlSize;
 322         __u8 bmaControls[0]; /* variable length */
 323 } __attribute__((packed));
 324
 325 static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc)
 326 {
 327         __u8 *raw = (__u8 *) desc;
 328         return raw[desc->bLength - 1];
 329 }
 330
 331 /* 4.3.2.6 Processing Unit Descriptors */
 332 struct uac_processing_unit_descriptor {
 333         __u8 bLength;
 334         __u8 bDescriptorType;
 335         __u8 bDescriptorSubtype;
 336         __u8 bUnitID;
 337         __le16 wProcessType;
 338         __u8 bNrInPins;
 339         __u8 baSourceID[];
 340 } __attribute__ ((packed));
 341
 342 static inline __u8 uac_processing_unit_bNrChannels(struct uac_processing_unit_descriptor *desc)
 343 {
 344         return desc->baSourceID[desc->bNrInPins];
 345 }
 346
 347 static inline __u32 uac_processing_unit_wChannelConfig(struct uac_processing_unit_descriptor *desc,
 348                                                        int protocol)
 349 {
 350         if (protocol == UAC_VERSION_1)
 351                 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
 352                         desc->baSourceID[desc->bNrInPins + 1];
 353         else
 354                 return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
 355                         (desc->baSourceID[desc->bNrInPins + 3] << 16) |
 356                         (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
 357                         (desc->baSourceID[desc->bNrInPins + 1]);
 358 }
 359
 360 static inline __u8 uac_processing_unit_iChannelNames(struct uac_processing_unit_descriptor *desc,
 361                                                      int protocol)
 362 {
 363         return (protocol == UAC_VERSION_1) ?
 364                 desc->baSourceID[desc->bNrInPins + 3] :
 365                 desc->baSourceID[desc->bNrInPins + 5];
 366 }
 367
 368 static inline __u8 uac_processing_unit_bControlSize(struct uac_processing_unit_descriptor *desc,
 369                                                     int protocol)
 370 {
 371         return (protocol == UAC_VERSION_1) ?
 372                 desc->baSourceID[desc->bNrInPins + 4] :
 373                 desc->baSourceID[desc->bNrInPins + 6];
 374 }
 375
 376 static inline __u8 *uac_processing_unit_bmControls(struct uac_processing_unit_descriptor *desc,
 377                                                    int protocol)
 378 {
 379         return (protocol == UAC_VERSION_1) ?
 380                 &desc->baSourceID[desc->bNrInPins + 5] :
 381                 &desc->baSourceID[desc->bNrInPins + 7];
 382 }
 383
 384 static inline __u8 uac_processing_unit_iProcessing(struct uac_processing_unit_descriptor *desc,
 385                                                    int protocol)
 386 {
 387         __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
 388         return *(uac_processing_unit_bmControls(desc, protocol)
 389                         + control_size);
 390 }
 391
 392 static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_descriptor *desc,
 393                                                  int protocol)
 394 {
 395         __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
 396         return uac_processing_unit_bmControls(desc, protocol)
 397                         + control_size + 1;
 398 }
 399
 400 /* 4.5.2 Class-Specific AS Interface Descriptor */
 401 struct uac1_as_header_descriptor {
 402         __u8  bLength;                  /* in bytes: 7 */
 403         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 404         __u8  bDescriptorSubtype;       /* AS_GENERAL */
 405         __u8  bTerminalLink;            /* Terminal ID of connected Terminal */
 406         __u8  bDelay;                   /* Delay introduced by the data path */
 407         __le16 wFormatTag;              /* The Audio Data Format */
 408 } __attribute__ ((packed));
 409
 410 #define UAC_DT_AS_HEADER_SIZE           7
 411
 412 /* Formats - A.1.1 Audio Data Format Type I Codes */
 413 #define UAC_FORMAT_TYPE_I_UNDEFINED     0x0
 414 #define UAC_FORMAT_TYPE_I_PCM           0x1
 415 #define UAC_FORMAT_TYPE_I_PCM8          0x2
 416 #define UAC_FORMAT_TYPE_I_IEEE_FLOAT    0x3
 417 #define UAC_FORMAT_TYPE_I_ALAW          0x4
 418 #define UAC_FORMAT_TYPE_I_MULAW         0x5
 419
 420 struct uac_format_type_i_continuous_descriptor {
 421         __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
 422         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 423         __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
 424         __u8  bFormatType;              /* FORMAT_TYPE_1 */
 425         __u8  bNrChannels;              /* physical channels in the stream */
 426         __u8  bSubframeSize;            /* */
 427         __u8  bBitResolution;
 428         __u8  bSamFreqType;
 429         __u8  tLowerSamFreq[3];
 430         __u8  tUpperSamFreq[3];
 431 } __attribute__ ((packed));
 432
 433 #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE  14
 434
 435 struct uac_format_type_i_discrete_descriptor {
 436         __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
 437         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 438         __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
 439         __u8  bFormatType;              /* FORMAT_TYPE_1 */
 440         __u8  bNrChannels;              /* physical channels in the stream */
 441         __u8  bSubframeSize;            /* */
 442         __u8  bBitResolution;
 443         __u8  bSamFreqType;
 444         __u8  tSamFreq[][3];
 445 } __attribute__ ((packed));
 446
 447 #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n)              \
 448 struct uac_format_type_i_discrete_descriptor_##n {              \
 449         __u8  bLength;                                          \
 450         __u8  bDescriptorType;                                  \
 451         __u8  bDescriptorSubtype;                               \
 452         __u8  bFormatType;                                      \
 453         __u8  bNrChannels;                                      \
 454         __u8  bSubframeSize;                                    \
 455         __u8  bBitResolution;                                   \
 456         __u8  bSamFreqType;                                     \
 457         __u8  tSamFreq[n][3];                                   \
 458 } __attribute__ ((packed))
 459
 460 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))
 461
 462 struct uac_format_type_i_ext_descriptor {
 463         __u8 bLength;
 464         __u8 bDescriptorType;
 465         __u8 bDescriptorSubtype;
 466         __u8 bFormatType;
 467         __u8 bSubslotSize;
 468         __u8 bBitResolution;
 469         __u8 bHeaderLength;
 470         __u8 bControlSize;
 471         __u8 bSideBandProtocol;
 472 } __attribute__((packed));
 473
 474 /* Formats - Audio Data Format Type I Codes */
 475
 476 #define UAC_FORMAT_TYPE_II_MPEG 0x1001
 477 #define UAC_FORMAT_TYPE_II_AC3  0x1002
 478
 479 struct uac_format_type_ii_discrete_descriptor {
 480         __u8 bLength;
 481         __u8 bDescriptorType;
 482         __u8 bDescriptorSubtype;
 483         __u8 bFormatType;
 484         __le16 wMaxBitRate;
 485         __le16 wSamplesPerFrame;
 486         __u8 bSamFreqType;
 487         __u8 tSamFreq[][3];
 488 } __attribute__((packed));
 489
 490 struct uac_format_type_ii_ext_descriptor {
 491         __u8 bLength;
 492         __u8 bDescriptorType;
 493         __u8 bDescriptorSubtype;
 494         __u8 bFormatType;
 495         __le16 wMaxBitRate;
 496         __le16 wSamplesPerFrame;
 497         __u8 bHeaderLength;
 498         __u8 bSideBandProtocol;
 499 } __attribute__((packed));
 500
 501 /* type III */
 502 #define UAC_FORMAT_TYPE_III_IEC1937_AC3 0x2001
 503 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG1_LAYER1        0x2002
 504 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_NOEXT 0x2003
 505 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_EXT   0x2004
 506 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER1_LS     0x2005
 507 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER23_LS    0x2006
 508
 509 /* Formats - A.2 Format Type Codes */
 510 #define UAC_FORMAT_TYPE_UNDEFINED       0x0
 511 #define UAC_FORMAT_TYPE_I               0x1
 512 #define UAC_FORMAT_TYPE_II              0x2
 513 #define UAC_FORMAT_TYPE_III             0x3
 514 #define UAC_EXT_FORMAT_TYPE_I           0x81
 515 #define UAC_EXT_FORMAT_TYPE_II          0x82
 516 #define UAC_EXT_FORMAT_TYPE_III         0x83
 517
 518 struct uac_iso_endpoint_descriptor {
 519         __u8  bLength;                  /* in bytes: 7 */
 520         __u8  bDescriptorType;          /* USB_DT_CS_ENDPOINT */
 521         __u8  bDescriptorSubtype;       /* EP_GENERAL */
 522         __u8  bmAttributes;
 523         __u8  bLockDelayUnits;
 524         __le16 wLockDelay;
 525 } __attribute__((packed));
 526 #define UAC_ISO_ENDPOINT_DESC_SIZE      7
 527
 528 #define UAC_EP_CS_ATTR_SAMPLE_RATE      0x01
 529 #define UAC_EP_CS_ATTR_PITCH_CONTROL    0x02
 530 #define UAC_EP_CS_ATTR_FILL_MAX         0x80
 531
 532 /* status word format (3.7.1.1) */
 533
 534 #define UAC1_STATUS_TYPE_ORIG_MASK              0x0f
 535 #define UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF  0x0
 536 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_IF   0x1
 537 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_EP   0x2
 538
 539 #define UAC1_STATUS_TYPE_IRQ_PENDING            (1 << 7)
 540 #define UAC1_STATUS_TYPE_MEM_CHANGED            (1 << 6)
 541
 542 struct uac1_status_word {
 543         __u8 bStatusType;
 544         __u8 bOriginator;
 545 } __attribute__((packed));
 546
 547
 548 #endif /* _UAPI__LINUX_USB_AUDIO_H */