xref: /linux/include/uapi/linux/usb/audio.h (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
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 _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 */
546