include/linux/usb/audio.h

   1 /*
   2  * <linux/usb/audio.h> -- USB Audio definitions.
   3  *
   4  * Copyright (C) 2006 Thumtronics Pty Ltd.
   5  * Developed for Thumtronics by Grey Innovation
   6  * Ben Williamson <ben.williamson@greyinnovation.com>
   7  *
   8  * This software is distributed under the terms of the GNU General Public
   9  * License ("GPL") version 2, as published by the Free Software Foundation.
  10  *
  11  * This file holds USB constants and structures defined
  12  * by the USB Device Class Definition for Audio Devices.
  13  * Comments below reference relevant sections of that document:
  14  *
  15  * http://www.usb.org/developers/devclass_docs/audio10.pdf
  16  *
  17  * Types and defines in this file are either specific to version 1.0 of
  18  * this standard or common for newer versions.
  19  */
  20
  21 #ifndef __LINUX_USB_AUDIO_H
  22 #define __LINUX_USB_AUDIO_H
  23
  24 #include <linux/types.h>
  25
  26 /* bInterfaceProtocol values to denote the version of the standard used */
  27 #define UAC_VERSION_1                   0x00
  28 #define UAC_VERSION_2                   0x20
  29
  30 /* A.2 Audio Interface Subclass Codes */
  31 #define USB_SUBCLASS_AUDIOCONTROL       0x01
  32 #define USB_SUBCLASS_AUDIOSTREAMING     0x02
  33 #define USB_SUBCLASS_MIDISTREAMING      0x03
  34
  35 /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
  36 #define UAC_HEADER                      0x01
  37 #define UAC_INPUT_TERMINAL              0x02
  38 #define UAC_OUTPUT_TERMINAL             0x03
  39 #define UAC_MIXER_UNIT                  0x04
  40 #define UAC_SELECTOR_UNIT               0x05
  41 #define UAC_FEATURE_UNIT                0x06
  42 #define UAC1_PROCESSING_UNIT            0x07
  43 #define UAC1_EXTENSION_UNIT             0x08
  44
  45 /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
  46 #define UAC_AS_GENERAL                  0x01
  47 #define UAC_FORMAT_TYPE                 0x02
  48 #define UAC_FORMAT_SPECIFIC             0x03
  49
  50 /* A.7 Processing Unit Process Types */
  51 #define UAC_PROCESS_UNDEFINED           0x00
  52 #define UAC_PROCESS_UP_DOWNMIX          0x01
  53 #define UAC_PROCESS_DOLBY_PROLOGIC      0x02
  54 #define UAC_PROCESS_STEREO_EXTENDER     0x03
  55 #define UAC_PROCESS_REVERB              0x04
  56 #define UAC_PROCESS_CHORUS              0x05
  57 #define UAC_PROCESS_DYN_RANGE_COMP      0x06
  58
  59 /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
  60 #define UAC_EP_GENERAL                  0x01
  61
  62 /* A.9 Audio Class-Specific Request Codes */
  63 #define UAC_SET_                        0x00
  64 #define UAC_GET_                        0x80
  65
  66 #define UAC__CUR                        0x1
  67 #define UAC__MIN                        0x2
  68 #define UAC__MAX                        0x3
  69 #define UAC__RES                        0x4
  70 #define UAC__MEM                        0x5
  71
  72 #define UAC_SET_CUR                     (UAC_SET_ | UAC__CUR)
  73 #define UAC_GET_CUR                     (UAC_GET_ | UAC__CUR)
  74 #define UAC_SET_MIN                     (UAC_SET_ | UAC__MIN)
  75 #define UAC_GET_MIN                     (UAC_GET_ | UAC__MIN)
  76 #define UAC_SET_MAX                     (UAC_SET_ | UAC__MAX)
  77 #define UAC_GET_MAX                     (UAC_GET_ | UAC__MAX)
  78 #define UAC_SET_RES                     (UAC_SET_ | UAC__RES)
  79 #define UAC_GET_RES                     (UAC_GET_ | UAC__RES)
  80 #define UAC_SET_MEM                     (UAC_SET_ | UAC__MEM)
  81 #define UAC_GET_MEM                     (UAC_GET_ | UAC__MEM)
  82
  83 #define UAC_GET_STAT                    0xff
  84
  85 /* A.10 Control Selector Codes */
  86
  87 /* A.10.1 Terminal Control Selectors */
  88 #define UAC_TERM_COPY_PROTECT           0x01
  89
  90 /* A.10.2 Feature Unit Control Selectors */
  91 #define UAC_FU_MUTE                     0x01
  92 #define UAC_FU_VOLUME                   0x02
  93 #define UAC_FU_BASS                     0x03
  94 #define UAC_FU_MID                      0x04
  95 #define UAC_FU_TREBLE                   0x05
  96 #define UAC_FU_GRAPHIC_EQUALIZER        0x06
  97 #define UAC_FU_AUTOMATIC_GAIN           0x07
  98 #define UAC_FU_DELAY                    0x08
  99 #define UAC_FU_BASS_BOOST               0x09
 100 #define UAC_FU_LOUDNESS                 0x0a
 101
 102 #define UAC_CONTROL_BIT(CS)     (1 << ((CS) - 1))
 103
 104 /* A.10.3.1 Up/Down-mix Processing Unit Controls Selectors */
 105 #define UAC_UD_ENABLE                   0x01
 106 #define UAC_UD_MODE_SELECT              0x02
 107
 108 /* A.10.3.2 Dolby Prologic (tm) Processing Unit Controls Selectors */
 109 #define UAC_DP_ENABLE                   0x01
 110 #define UAC_DP_MODE_SELECT              0x02
 111
 112 /* A.10.3.3 3D Stereo Extender Processing Unit Control Selectors */
 113 #define UAC_3D_ENABLE                   0x01
 114 #define UAC_3D_SPACE                    0x02
 115
 116 /* A.10.3.4 Reverberation Processing Unit Control Selectors */
 117 #define UAC_REVERB_ENABLE               0x01
 118 #define UAC_REVERB_LEVEL                0x02
 119 #define UAC_REVERB_TIME                 0x03
 120 #define UAC_REVERB_FEEDBACK             0x04
 121
 122 /* A.10.3.5 Chorus Processing Unit Control Selectors */
 123 #define UAC_CHORUS_ENABLE               0x01
 124 #define UAC_CHORUS_LEVEL                0x02
 125 #define UAC_CHORUS_RATE                 0x03
 126 #define UAC_CHORUS_DEPTH                0x04
 127
 128 /* A.10.3.6 Dynamic Range Compressor Unit Control Selectors */
 129 #define UAC_DCR_ENABLE                  0x01
 130 #define UAC_DCR_RATE                    0x02
 131 #define UAC_DCR_MAXAMPL                 0x03
 132 #define UAC_DCR_THRESHOLD               0x04
 133 #define UAC_DCR_ATTACK_TIME             0x05
 134 #define UAC_DCR_RELEASE_TIME            0x06
 135
 136 /* A.10.4 Extension Unit Control Selectors */
 137 #define UAC_XU_ENABLE                   0x01
 138
 139 /* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */
 140 #define UAC_MS_HEADER                   0x01
 141 #define UAC_MIDI_IN_JACK                0x02
 142 #define UAC_MIDI_OUT_JACK               0x03
 143
 144 /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
 145 #define UAC_MS_GENERAL                  0x01
 146
 147 /* Terminals - 2.1 USB Terminal Types */
 148 #define UAC_TERMINAL_UNDEFINED          0x100
 149 #define UAC_TERMINAL_STREAMING          0x101
 150 #define UAC_TERMINAL_VENDOR_SPEC        0x1FF
 151
 152 /* Terminal Control Selectors */
 153 /* 4.3.2  Class-Specific AC Interface Descriptor */
 154 struct uac1_ac_header_descriptor {
 155         __u8  bLength;                  /* 8 + n */
 156         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 157         __u8  bDescriptorSubtype;       /* UAC_MS_HEADER */
 158         __le16 bcdADC;                  /* 0x0100 */
 159         __le16 wTotalLength;            /* includes Unit and Terminal desc. */
 160         __u8  bInCollection;            /* n */
 161         __u8  baInterfaceNr[];          /* [n] */
 162 } __attribute__ ((packed));
 163
 164 #define UAC_DT_AC_HEADER_SIZE(n)        (8 + (n))
 165
 166 /* As above, but more useful for defining your own descriptors: */
 167 #define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n)                     \
 168 struct uac1_ac_header_descriptor_##n {                  \
 169         __u8  bLength;                                          \
 170         __u8  bDescriptorType;                                  \
 171         __u8  bDescriptorSubtype;                               \
 172         __le16 bcdADC;                                          \
 173         __le16 wTotalLength;                                    \
 174         __u8  bInCollection;                                    \
 175         __u8  baInterfaceNr[n];                                 \
 176 } __attribute__ ((packed))
 177
 178 /* 4.3.2.1 Input Terminal Descriptor */
 179 struct uac_input_terminal_descriptor {
 180         __u8  bLength;                  /* in bytes: 12 */
 181         __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
 182         __u8  bDescriptorSubtype;       /* INPUT_TERMINAL descriptor subtype */
 183         __u8  bTerminalID;              /* Constant uniquely terminal ID */
 184         __le16 wTerminalType;           /* USB Audio Terminal Types */
 185         __u8  bAssocTerminal;           /* ID of the Output Terminal associated */
 186         __u8  bNrChannels;              /* Number of logical output channels */
 187         __le16 wChannelConfig;
 188         __u8  iChannelNames;
 189         __u8  iTerminal;
 190 } __attribute__ ((packed));
 191
 192 #define UAC_DT_INPUT_TERMINAL_SIZE                      12
 193
 194 /* Terminals - 2.2 Input Terminal Types */
 195 #define UAC_INPUT_TERMINAL_UNDEFINED                    0x200
 196 #define UAC_INPUT_TERMINAL_MICROPHONE                   0x201
 197 #define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE           0x202
 198 #define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE          0x203
 199 #define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE          0x204
 200 #define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY             0x205
 201 #define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY        0x206
 202
 203 /* Terminals - control selectors */
 204
 205 #define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL            0x01
 206
 207 /* 4.3.2.2 Output Terminal Descriptor */
 208 struct uac1_output_terminal_descriptor {
 209         __u8  bLength;                  /* in bytes: 9 */
 210         __u8  bDescriptorType;          /* CS_INTERFACE descriptor type */
 211         __u8  bDescriptorSubtype;       /* OUTPUT_TERMINAL descriptor subtype */
 212         __u8  bTerminalID;              /* Constant uniquely terminal ID */
 213         __le16 wTerminalType;           /* USB Audio Terminal Types */
 214         __u8  bAssocTerminal;           /* ID of the Input Terminal associated */
 215         __u8  bSourceID;                /* ID of the connected Unit or Terminal*/
 216         __u8  iTerminal;
 217 } __attribute__ ((packed));
 218
 219 #define UAC_DT_OUTPUT_TERMINAL_SIZE                     9
 220
 221 /* Terminals - 2.3 Output Terminal Types */
 222 #define UAC_OUTPUT_TERMINAL_UNDEFINED                   0x300
 223 #define UAC_OUTPUT_TERMINAL_SPEAKER                     0x301
 224 #define UAC_OUTPUT_TERMINAL_HEADPHONES                  0x302
 225 #define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO  0x303
 226 #define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER             0x304
 227 #define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER                0x305
 228 #define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER       0x306
 229 #define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER    0x307
 230
 231 /* Set bControlSize = 2 as default setting */
 232 #define UAC_DT_FEATURE_UNIT_SIZE(ch)            (7 + ((ch) + 1) * 2)
 233
 234 /* As above, but more useful for defining your own descriptors: */
 235 #define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch)                 \
 236 struct uac_feature_unit_descriptor_##ch {                       \
 237         __u8  bLength;                                          \
 238         __u8  bDescriptorType;                                  \
 239         __u8  bDescriptorSubtype;                               \
 240         __u8  bUnitID;                                          \
 241         __u8  bSourceID;                                        \
 242         __u8  bControlSize;                                     \
 243         __le16 bmaControls[ch + 1];                             \
 244         __u8  iFeature;                                         \
 245 } __attribute__ ((packed))
 246
 247 /* 4.3.2.3 Mixer Unit Descriptor */
 248 struct uac_mixer_unit_descriptor {
 249         __u8 bLength;
 250         __u8 bDescriptorType;
 251         __u8 bDescriptorSubtype;
 252         __u8 bUnitID;
 253         __u8 bNrInPins;
 254         __u8 baSourceID[];
 255 } __attribute__ ((packed));
 256
 257 static inline __u8 uac_mixer_unit_bNrChannels(struct uac_mixer_unit_descriptor *desc)
 258 {
 259         return desc->baSourceID[desc->bNrInPins];
 260 }
 261
 262 static inline __u32 uac_mixer_unit_wChannelConfig(struct uac_mixer_unit_descriptor *desc,
 263                                                   int protocol)
 264 {
 265         if (protocol == UAC_VERSION_1)
 266                 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
 267                         desc->baSourceID[desc->bNrInPins + 1];
 268         else
 269                 return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
 270                         (desc->baSourceID[desc->bNrInPins + 3] << 16) |
 271                         (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
 272                         (desc->baSourceID[desc->bNrInPins + 1]);
 273 }
 274
 275 static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor *desc,
 276                                                 int protocol)
 277 {
 278         return (protocol == UAC_VERSION_1) ?
 279                 desc->baSourceID[desc->bNrInPins + 3] :
 280                 desc->baSourceID[desc->bNrInPins + 5];
 281 }
 282
 283 static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc,
 284                                               int protocol)
 285 {
 286         return (protocol == UAC_VERSION_1) ?
 287                 &desc->baSourceID[desc->bNrInPins + 4] :
 288                 &desc->baSourceID[desc->bNrInPins + 6];
 289 }
 290
 291 static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc)
 292 {
 293         __u8 *raw = (__u8 *) desc;
 294         return raw[desc->bLength - 1];
 295 }
 296
 297 /* 4.3.2.4 Selector Unit Descriptor */
 298 struct uac_selector_unit_descriptor {
 299         __u8 bLength;
 300         __u8 bDescriptorType;
 301         __u8 bDescriptorSubtype;
 302         __u8 bUintID;
 303         __u8 bNrInPins;
 304         __u8 baSourceID[];
 305 } __attribute__ ((packed));
 306
 307 static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc)
 308 {
 309         __u8 *raw = (__u8 *) desc;
 310         return raw[desc->bLength - 1];
 311 }
 312
 313 /* 4.3.2.5 Feature Unit Descriptor */
 314 struct uac_feature_unit_descriptor {
 315         __u8 bLength;
 316         __u8 bDescriptorType;
 317         __u8 bDescriptorSubtype;
 318         __u8 bUnitID;
 319         __u8 bSourceID;
 320         __u8 bControlSize;
 321         __u8 bmaControls[0]; /* variable length */
 322 } __attribute__((packed));
 323
 324 static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc)
 325 {
 326         __u8 *raw = (__u8 *) desc;
 327         return raw[desc->bLength - 1];
 328 }
 329
 330 /* 4.3.2.6 Processing Unit Descriptors */
 331 struct uac_processing_unit_descriptor {
 332         __u8 bLength;
 333         __u8 bDescriptorType;
 334         __u8 bDescriptorSubtype;
 335         __u8 bUnitID;
 336         __u16 wProcessType;
 337         __u8 bNrInPins;
 338         __u8 baSourceID[];
 339 } __attribute__ ((packed));
 340
 341 static inline __u8 uac_processing_unit_bNrChannels(struct uac_processing_unit_descriptor *desc)
 342 {
 343         return desc->baSourceID[desc->bNrInPins];
 344 }
 345
 346 static inline __u32 uac_processing_unit_wChannelConfig(struct uac_processing_unit_descriptor *desc,
 347                                                        int protocol)
 348 {
 349         if (protocol == UAC_VERSION_1)
 350                 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
 351                         desc->baSourceID[desc->bNrInPins + 1];
 352         else
 353                 return  (desc->baSourceID[desc->bNrInPins + 4] << 24) |
 354                         (desc->baSourceID[desc->bNrInPins + 3] << 16) |
 355                         (desc->baSourceID[desc->bNrInPins + 2] << 8)  |
 356                         (desc->baSourceID[desc->bNrInPins + 1]);
 357 }
 358
 359 static inline __u8 uac_processing_unit_iChannelNames(struct uac_processing_unit_descriptor *desc,
 360                                                      int protocol)
 361 {
 362         return (protocol == UAC_VERSION_1) ?
 363                 desc->baSourceID[desc->bNrInPins + 3] :
 364                 desc->baSourceID[desc->bNrInPins + 5];
 365 }
 366
 367 static inline __u8 uac_processing_unit_bControlSize(struct uac_processing_unit_descriptor *desc,
 368                                                     int protocol)
 369 {
 370         return (protocol == UAC_VERSION_1) ?
 371                 desc->baSourceID[desc->bNrInPins + 4] :
 372                 desc->baSourceID[desc->bNrInPins + 6];
 373 }
 374
 375 static inline __u8 *uac_processing_unit_bmControls(struct uac_processing_unit_descriptor *desc,
 376                                                    int protocol)
 377 {
 378         return (protocol == UAC_VERSION_1) ?
 379                 &desc->baSourceID[desc->bNrInPins + 5] :
 380                 &desc->baSourceID[desc->bNrInPins + 7];
 381 }
 382
 383 static inline __u8 uac_processing_unit_iProcessing(struct uac_processing_unit_descriptor *desc,
 384                                                    int protocol)
 385 {
 386         __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
 387         return desc->baSourceID[desc->bNrInPins + control_size];
 388 }
 389
 390 static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_descriptor *desc,
 391                                                  int protocol)
 392 {
 393         __u8 control_size = uac_processing_unit_bControlSize(desc, protocol);
 394         return &desc->baSourceID[desc->bNrInPins + control_size + 1];
 395 }
 396
 397 /* 4.5.2 Class-Specific AS Interface Descriptor */
 398 struct uac1_as_header_descriptor {
 399         __u8  bLength;                  /* in bytes: 7 */
 400         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 401         __u8  bDescriptorSubtype;       /* AS_GENERAL */
 402         __u8  bTerminalLink;            /* Terminal ID of connected Terminal */
 403         __u8  bDelay;                   /* Delay introduced by the data path */
 404         __le16 wFormatTag;              /* The Audio Data Format */
 405 } __attribute__ ((packed));
 406
 407 #define UAC_DT_AS_HEADER_SIZE           7
 408
 409 /* Formats - A.1.1 Audio Data Format Type I Codes */
 410 #define UAC_FORMAT_TYPE_I_UNDEFINED     0x0
 411 #define UAC_FORMAT_TYPE_I_PCM           0x1
 412 #define UAC_FORMAT_TYPE_I_PCM8          0x2
 413 #define UAC_FORMAT_TYPE_I_IEEE_FLOAT    0x3
 414 #define UAC_FORMAT_TYPE_I_ALAW          0x4
 415 #define UAC_FORMAT_TYPE_I_MULAW         0x5
 416
 417 struct uac_format_type_i_continuous_descriptor {
 418         __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
 419         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 420         __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
 421         __u8  bFormatType;              /* FORMAT_TYPE_1 */
 422         __u8  bNrChannels;              /* physical channels in the stream */
 423         __u8  bSubframeSize;            /* */
 424         __u8  bBitResolution;
 425         __u8  bSamFreqType;
 426         __u8  tLowerSamFreq[3];
 427         __u8  tUpperSamFreq[3];
 428 } __attribute__ ((packed));
 429
 430 #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE  14
 431
 432 struct uac_format_type_i_discrete_descriptor {
 433         __u8  bLength;                  /* in bytes: 8 + (ns * 3) */
 434         __u8  bDescriptorType;          /* USB_DT_CS_INTERFACE */
 435         __u8  bDescriptorSubtype;       /* FORMAT_TYPE */
 436         __u8  bFormatType;              /* FORMAT_TYPE_1 */
 437         __u8  bNrChannels;              /* physical channels in the stream */
 438         __u8  bSubframeSize;            /* */
 439         __u8  bBitResolution;
 440         __u8  bSamFreqType;
 441         __u8  tSamFreq[][3];
 442 } __attribute__ ((packed));
 443
 444 #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n)              \
 445 struct uac_format_type_i_discrete_descriptor_##n {              \
 446         __u8  bLength;                                          \
 447         __u8  bDescriptorType;                                  \
 448         __u8  bDescriptorSubtype;                               \
 449         __u8  bFormatType;                                      \
 450         __u8  bNrChannels;                                      \
 451         __u8  bSubframeSize;                                    \
 452         __u8  bBitResolution;                                   \
 453         __u8  bSamFreqType;                                     \
 454         __u8  tSamFreq[n][3];                                   \
 455 } __attribute__ ((packed))
 456
 457 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))
 458
 459 struct uac_format_type_i_ext_descriptor {
 460         __u8 bLength;
 461         __u8 bDescriptorType;
 462         __u8 bDescriptorSubtype;
 463         __u8 bFormatType;
 464         __u8 bSubslotSize;
 465         __u8 bBitResolution;
 466         __u8 bHeaderLength;
 467         __u8 bControlSize;
 468         __u8 bSideBandProtocol;
 469 } __attribute__((packed));
 470
 471 /* Formats - Audio Data Format Type I Codes */
 472
 473 #define UAC_FORMAT_TYPE_II_MPEG 0x1001
 474 #define UAC_FORMAT_TYPE_II_AC3  0x1002
 475
 476 struct uac_format_type_ii_discrete_descriptor {
 477         __u8 bLength;
 478         __u8 bDescriptorType;
 479         __u8 bDescriptorSubtype;
 480         __u8 bFormatType;
 481         __le16 wMaxBitRate;
 482         __le16 wSamplesPerFrame;
 483         __u8 bSamFreqType;
 484         __u8 tSamFreq[][3];
 485 } __attribute__((packed));
 486
 487 struct uac_format_type_ii_ext_descriptor {
 488         __u8 bLength;
 489         __u8 bDescriptorType;
 490         __u8 bDescriptorSubtype;
 491         __u8 bFormatType;
 492         __u16 wMaxBitRate;
 493         __u16 wSamplesPerFrame;
 494         __u8 bHeaderLength;
 495         __u8 bSideBandProtocol;
 496 } __attribute__((packed));
 497
 498 /* type III */
 499 #define UAC_FORMAT_TYPE_III_IEC1937_AC3 0x2001
 500 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG1_LAYER1        0x2002
 501 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_NOEXT 0x2003
 502 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_EXT   0x2004
 503 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER1_LS     0x2005
 504 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER23_LS    0x2006
 505
 506 /* Formats - A.2 Format Type Codes */
 507 #define UAC_FORMAT_TYPE_UNDEFINED       0x0
 508 #define UAC_FORMAT_TYPE_I               0x1
 509 #define UAC_FORMAT_TYPE_II              0x2
 510 #define UAC_FORMAT_TYPE_III             0x3
 511 #define UAC_EXT_FORMAT_TYPE_I           0x81
 512 #define UAC_EXT_FORMAT_TYPE_II          0x82
 513 #define UAC_EXT_FORMAT_TYPE_III         0x83
 514
 515 struct uac_iso_endpoint_descriptor {
 516         __u8  bLength;                  /* in bytes: 7 */
 517         __u8  bDescriptorType;          /* USB_DT_CS_ENDPOINT */
 518         __u8  bDescriptorSubtype;       /* EP_GENERAL */
 519         __u8  bmAttributes;
 520         __u8  bLockDelayUnits;
 521         __le16 wLockDelay;
 522 } __attribute__((packed));
 523 #define UAC_ISO_ENDPOINT_DESC_SIZE      7
 524
 525 #define UAC_EP_CS_ATTR_SAMPLE_RATE      0x01
 526 #define UAC_EP_CS_ATTR_PITCH_CONTROL    0x02
 527 #define UAC_EP_CS_ATTR_FILL_MAX         0x80
 528
 529 /* status word format (3.7.1.1) */
 530
 531 #define UAC1_STATUS_TYPE_ORIG_MASK              0x0f
 532 #define UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF  0x0
 533 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_IF   0x1
 534 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_EP   0x2
 535
 536 #define UAC1_STATUS_TYPE_IRQ_PENDING            (1 << 7)
 537 #define UAC1_STATUS_TYPE_MEM_CHANGED            (1 << 6)
 538
 539 struct uac1_status_word {
 540         __u8 bStatusType;
 541         __u8 bOriginator;
 542 } __attribute__((packed));
 543
 544 #ifdef __KERNEL__
 545
 546 struct usb_audio_control {
 547         struct list_head list;
 548         const char *name;
 549         u8 type;
 550         int data[5];
 551         int (*set)(struct usb_audio_control *con, u8 cmd, int value);
 552         int (*get)(struct usb_audio_control *con, u8 cmd);
 553 };
 554
 555 struct usb_audio_control_selector {
 556         struct list_head list;
 557         struct list_head control;
 558         u8 id;
 559         const char *name;
 560         u8 type;
 561         struct usb_descriptor_header *desc;
 562 };
 563
 564 #endif /* __KERNEL__ */
 565
 566 #endif /* __LINUX_USB_AUDIO_H */