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audio.h
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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 <[email protected]>
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 _UAPI__LINUX_USB_AUDIO_H
22 #define _UAPI__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 
545 #endif /* _UAPI__LINUX_USB_AUDIO_H */
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