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001: /*
002:  * <linux/usb/audio.h> -- USB Audio definitions.
003:  *
004:  * Copyright (C) 2006 Thumtronics Pty Ltd.
005:  * Developed for Thumtronics by Grey Innovation
006:  * Ben Williamson <ben.williamson@greyinnovation.com>
007:  *
008:  * This software is distributed under the terms of the GNU General Public
009:  * License ("GPL") version 2, as published by the Free Software Foundation.
010:  *
011:  * This file holds USB constants and structures defined
012:  * by the USB Device Class Definition for Audio Devices.
013:  * Comments below reference relevant sections of that document:
014:  *
015:  * http://www.usb.org/developers/devclass_docs/audio10.pdf
016:  *
017:  * Types and defines in this file are either specific to version 1.0 of
018:  * this standard or common for newer versions.
019:  */
020: 
021: #ifndef __LINUX_USB_AUDIO_H
022: #define __LINUX_USB_AUDIO_H
023: 
024: #include <linux/types.h>
025: 
026: /* bInterfaceProtocol values to denote the version of the standard used */
027: #define UAC_VERSION_1                   0x00
028: #define UAC_VERSION_2                   0x20
029: 
030: /* A.2 Audio Interface Subclass Codes */
031: #define USB_SUBCLASS_AUDIOCONTROL       0x01
032: #define USB_SUBCLASS_AUDIOSTREAMING     0x02
033: #define USB_SUBCLASS_MIDISTREAMING      0x03
034: 
035: /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
036: #define UAC_HEADER                      0x01
037: #define UAC_INPUT_TERMINAL              0x02
038: #define UAC_OUTPUT_TERMINAL             0x03
039: #define UAC_MIXER_UNIT                  0x04
040: #define UAC_SELECTOR_UNIT               0x05
041: #define UAC_FEATURE_UNIT                0x06
042: #define UAC1_PROCESSING_UNIT            0x07
043: #define UAC1_EXTENSION_UNIT             0x08
044: 
045: /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
046: #define UAC_AS_GENERAL                  0x01
047: #define UAC_FORMAT_TYPE                 0x02
048: #define UAC_FORMAT_SPECIFIC             0x03
049: 
050: /* A.7 Processing Unit Process Types */
051: #define UAC_PROCESS_UNDEFINED           0x00
052: #define UAC_PROCESS_UP_DOWNMIX          0x01
053: #define UAC_PROCESS_DOLBY_PROLOGIC      0x02
054: #define UAC_PROCESS_STEREO_EXTENDER     0x03
055: #define UAC_PROCESS_REVERB              0x04
056: #define UAC_PROCESS_CHORUS              0x05
057: #define UAC_PROCESS_DYN_RANGE_COMP      0x06
058: 
059: /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
060: #define UAC_EP_GENERAL                  0x01
061: 
062: /* A.9 Audio Class-Specific Request Codes */
063: #define UAC_SET_                        0x00
064: #define UAC_GET_                        0x80
065: 
066: #define UAC__CUR                        0x1
067: #define UAC__MIN                        0x2
068: #define UAC__MAX                        0x3
069: #define UAC__RES                        0x4
070: #define UAC__MEM                        0x5
071: 
072: #define UAC_SET_CUR                     (UAC_SET_ | UAC__CUR)
073: #define UAC_GET_CUR                     (UAC_GET_ | UAC__CUR)
074: #define UAC_SET_MIN                     (UAC_SET_ | UAC__MIN)
075: #define UAC_GET_MIN                     (UAC_GET_ | UAC__MIN)
076: #define UAC_SET_MAX                     (UAC_SET_ | UAC__MAX)
077: #define UAC_GET_MAX                     (UAC_GET_ | UAC__MAX)
078: #define UAC_SET_RES                     (UAC_SET_ | UAC__RES)
079: #define UAC_GET_RES                     (UAC_GET_ | UAC__RES)
080: #define UAC_SET_MEM                     (UAC_SET_ | UAC__MEM)
081: #define UAC_GET_MEM                     (UAC_GET_ | UAC__MEM)
082: 
083: #define UAC_GET_STAT                    0xff
084: 
085: /* A.10 Control Selector Codes */
086: 
087: /* A.10.1 Terminal Control Selectors */
088: #define UAC_TERM_COPY_PROTECT           0x01
089: 
090: /* A.10.2 Feature Unit Control Selectors */
091: #define UAC_FU_MUTE                     0x01
092: #define UAC_FU_VOLUME                   0x02
093: #define UAC_FU_BASS                     0x03
094: #define UAC_FU_MID                      0x04
095: #define UAC_FU_TREBLE                   0x05
096: #define UAC_FU_GRAPHIC_EQUALIZER        0x06
097: #define UAC_FU_AUTOMATIC_GAIN           0x07
098: #define UAC_FU_DELAY                    0x08
099: #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: 
545: #endif /* __LINUX_USB_AUDIO_H */
546: 

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