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1/*
2 * PCM Interface - misc routines
3 * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Library General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/time.h>
23#include <linux/export.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#define SND_PCM_FORMAT_UNKNOWN (-1)
27
28/* NOTE: "signed" prefix must be given below since the default char is
29 * unsigned on some architectures!
30 */
31struct pcm_format_data {
32 unsigned char width; /* bit width */
33 unsigned char phys; /* physical bit width */
34 signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
35 signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
36 unsigned char silence[8]; /* silence data to fill */
37};
38
39/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
40#define INT __force int
41
42static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
43 [SNDRV_PCM_FORMAT_S8] = {
44 .width = 8, .phys = 8, .le = -1, .signd = 1,
45 .silence = {},
46 },
47 [SNDRV_PCM_FORMAT_U8] = {
48 .width = 8, .phys = 8, .le = -1, .signd = 0,
49 .silence = { 0x80 },
50 },
51 [SNDRV_PCM_FORMAT_S16_LE] = {
52 .width = 16, .phys = 16, .le = 1, .signd = 1,
53 .silence = {},
54 },
55 [SNDRV_PCM_FORMAT_S16_BE] = {
56 .width = 16, .phys = 16, .le = 0, .signd = 1,
57 .silence = {},
58 },
59 [SNDRV_PCM_FORMAT_U16_LE] = {
60 .width = 16, .phys = 16, .le = 1, .signd = 0,
61 .silence = { 0x00, 0x80 },
62 },
63 [SNDRV_PCM_FORMAT_U16_BE] = {
64 .width = 16, .phys = 16, .le = 0, .signd = 0,
65 .silence = { 0x80, 0x00 },
66 },
67 [SNDRV_PCM_FORMAT_S24_LE] = {
68 .width = 24, .phys = 32, .le = 1, .signd = 1,
69 .silence = {},
70 },
71 [SNDRV_PCM_FORMAT_S24_BE] = {
72 .width = 24, .phys = 32, .le = 0, .signd = 1,
73 .silence = {},
74 },
75 [SNDRV_PCM_FORMAT_U24_LE] = {
76 .width = 24, .phys = 32, .le = 1, .signd = 0,
77 .silence = { 0x00, 0x00, 0x80 },
78 },
79 [SNDRV_PCM_FORMAT_U24_BE] = {
80 .width = 24, .phys = 32, .le = 0, .signd = 0,
81 .silence = { 0x00, 0x80, 0x00, 0x00 },
82 },
83 [SNDRV_PCM_FORMAT_S32_LE] = {
84 .width = 32, .phys = 32, .le = 1, .signd = 1,
85 .silence = {},
86 },
87 [SNDRV_PCM_FORMAT_S32_BE] = {
88 .width = 32, .phys = 32, .le = 0, .signd = 1,
89 .silence = {},
90 },
91 [SNDRV_PCM_FORMAT_U32_LE] = {
92 .width = 32, .phys = 32, .le = 1, .signd = 0,
93 .silence = { 0x00, 0x00, 0x00, 0x80 },
94 },
95 [SNDRV_PCM_FORMAT_U32_BE] = {
96 .width = 32, .phys = 32, .le = 0, .signd = 0,
97 .silence = { 0x80, 0x00, 0x00, 0x00 },
98 },
99 [SNDRV_PCM_FORMAT_FLOAT_LE] = {
100 .width = 32, .phys = 32, .le = 1, .signd = -1,
101 .silence = {},
102 },
103 [SNDRV_PCM_FORMAT_FLOAT_BE] = {
104 .width = 32, .phys = 32, .le = 0, .signd = -1,
105 .silence = {},
106 },
107 [SNDRV_PCM_FORMAT_FLOAT64_LE] = {
108 .width = 64, .phys = 64, .le = 1, .signd = -1,
109 .silence = {},
110 },
111 [SNDRV_PCM_FORMAT_FLOAT64_BE] = {
112 .width = 64, .phys = 64, .le = 0, .signd = -1,
113 .silence = {},
114 },
115 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
116 .width = 32, .phys = 32, .le = 1, .signd = -1,
117 .silence = {},
118 },
119 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
120 .width = 32, .phys = 32, .le = 0, .signd = -1,
121 .silence = {},
122 },
123 [SNDRV_PCM_FORMAT_MU_LAW] = {
124 .width = 8, .phys = 8, .le = -1, .signd = -1,
125 .silence = { 0x7f },
126 },
127 [SNDRV_PCM_FORMAT_A_LAW] = {
128 .width = 8, .phys = 8, .le = -1, .signd = -1,
129 .silence = { 0x55 },
130 },
131 [SNDRV_PCM_FORMAT_IMA_ADPCM] = {
132 .width = 4, .phys = 4, .le = -1, .signd = -1,
133 .silence = {},
134 },
135 [SNDRV_PCM_FORMAT_G723_24] = {
136 .width = 3, .phys = 3, .le = -1, .signd = -1,
137 .silence = {},
138 },
139 [SNDRV_PCM_FORMAT_G723_40] = {
140 .width = 5, .phys = 5, .le = -1, .signd = -1,
141 .silence = {},
142 },
143 [SNDRV_PCM_FORMAT_DSD_U8] = {
144 .width = 8, .phys = 8, .le = 1, .signd = 0,
145 .silence = {},
146 },
147 [SNDRV_PCM_FORMAT_DSD_U16_LE] = {
148 .width = 16, .phys = 16, .le = 1, .signd = 0,
149 .silence = {},
150 },
151 /* FIXME: the following three formats are not defined properly yet */
152 [SNDRV_PCM_FORMAT_MPEG] = {
153 .le = -1, .signd = -1,
154 },
155 [SNDRV_PCM_FORMAT_GSM] = {
156 .le = -1, .signd = -1,
157 },
158 [SNDRV_PCM_FORMAT_SPECIAL] = {
159 .le = -1, .signd = -1,
160 },
161 [SNDRV_PCM_FORMAT_S24_3LE] = {
162 .width = 24, .phys = 24, .le = 1, .signd = 1,
163 .silence = {},
164 },
165 [SNDRV_PCM_FORMAT_S24_3BE] = {
166 .width = 24, .phys = 24, .le = 0, .signd = 1,
167 .silence = {},
168 },
169 [SNDRV_PCM_FORMAT_U24_3LE] = {
170 .width = 24, .phys = 24, .le = 1, .signd = 0,
171 .silence = { 0x00, 0x00, 0x80 },
172 },
173 [SNDRV_PCM_FORMAT_U24_3BE] = {
174 .width = 24, .phys = 24, .le = 0, .signd = 0,
175 .silence = { 0x80, 0x00, 0x00 },
176 },
177 [SNDRV_PCM_FORMAT_S20_3LE] = {
178 .width = 20, .phys = 24, .le = 1, .signd = 1,
179 .silence = {},
180 },
181 [SNDRV_PCM_FORMAT_S20_3BE] = {
182 .width = 20, .phys = 24, .le = 0, .signd = 1,
183 .silence = {},
184 },
185 [SNDRV_PCM_FORMAT_U20_3LE] = {
186 .width = 20, .phys = 24, .le = 1, .signd = 0,
187 .silence = { 0x00, 0x00, 0x08 },
188 },
189 [SNDRV_PCM_FORMAT_U20_3BE] = {
190 .width = 20, .phys = 24, .le = 0, .signd = 0,
191 .silence = { 0x08, 0x00, 0x00 },
192 },
193 [SNDRV_PCM_FORMAT_S18_3LE] = {
194 .width = 18, .phys = 24, .le = 1, .signd = 1,
195 .silence = {},
196 },
197 [SNDRV_PCM_FORMAT_S18_3BE] = {
198 .width = 18, .phys = 24, .le = 0, .signd = 1,
199 .silence = {},
200 },
201 [SNDRV_PCM_FORMAT_U18_3LE] = {
202 .width = 18, .phys = 24, .le = 1, .signd = 0,
203 .silence = { 0x00, 0x00, 0x02 },
204 },
205 [SNDRV_PCM_FORMAT_U18_3BE] = {
206 .width = 18, .phys = 24, .le = 0, .signd = 0,
207 .silence = { 0x02, 0x00, 0x00 },
208 },
209 [SNDRV_PCM_FORMAT_G723_24_1B] = {
210 .width = 3, .phys = 8, .le = -1, .signd = -1,
211 .silence = {},
212 },
213 [SNDRV_PCM_FORMAT_G723_40_1B] = {
214 .width = 5, .phys = 8, .le = -1, .signd = -1,
215 .silence = {},
216 },
217};
218
219
220/**
221 * snd_pcm_format_signed - Check the PCM format is signed linear
222 * @format: the format to check
223 *
224 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
225 * linear, and a negative error code for non-linear formats.
226 */
227int snd_pcm_format_signed(snd_pcm_format_t format)
228{
229 int val;
230 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
231 return -EINVAL;
232 if ((val = pcm_formats[(INT)format].signd) < 0)
233 return -EINVAL;
234 return val;
235}
236
237EXPORT_SYMBOL(snd_pcm_format_signed);
238
239/**
240 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
241 * @format: the format to check
242 *
243 * Return: 1 if the given PCM format is unsigned linear, 0 if signed
244 * linear, and a negative error code for non-linear formats.
245 */
246int snd_pcm_format_unsigned(snd_pcm_format_t format)
247{
248 int val;
249
250 val = snd_pcm_format_signed(format);
251 if (val < 0)
252 return val;
253 return !val;
254}
255
256EXPORT_SYMBOL(snd_pcm_format_unsigned);
257
258/**
259 * snd_pcm_format_linear - Check the PCM format is linear
260 * @format: the format to check
261 *
262 * Return: 1 if the given PCM format is linear, 0 if not.
263 */
264int snd_pcm_format_linear(snd_pcm_format_t format)
265{
266 return snd_pcm_format_signed(format) >= 0;
267}
268
269EXPORT_SYMBOL(snd_pcm_format_linear);
270
271/**
272 * snd_pcm_format_little_endian - Check the PCM format is little-endian
273 * @format: the format to check
274 *
275 * Return: 1 if the given PCM format is little-endian, 0 if
276 * big-endian, or a negative error code if endian not specified.
277 */
278int snd_pcm_format_little_endian(snd_pcm_format_t format)
279{
280 int val;
281 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
282 return -EINVAL;
283 if ((val = pcm_formats[(INT)format].le) < 0)
284 return -EINVAL;
285 return val;
286}
287
288EXPORT_SYMBOL(snd_pcm_format_little_endian);
289
290/**
291 * snd_pcm_format_big_endian - Check the PCM format is big-endian
292 * @format: the format to check
293 *
294 * Return: 1 if the given PCM format is big-endian, 0 if
295 * little-endian, or a negative error code if endian not specified.
296 */
297int snd_pcm_format_big_endian(snd_pcm_format_t format)
298{
299 int val;
300
301 val = snd_pcm_format_little_endian(format);
302 if (val < 0)
303 return val;
304 return !val;
305}
306
307EXPORT_SYMBOL(snd_pcm_format_big_endian);
308
309/**
310 * snd_pcm_format_width - return the bit-width of the format
311 * @format: the format to check
312 *
313 * Return: The bit-width of the format, or a negative error code
314 * if unknown format.
315 */
316int snd_pcm_format_width(snd_pcm_format_t format)
317{
318 int val;
319 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
320 return -EINVAL;
321 if ((val = pcm_formats[(INT)format].width) == 0)
322 return -EINVAL;
323 return val;
324}
325
326EXPORT_SYMBOL(snd_pcm_format_width);
327
328/**
329 * snd_pcm_format_physical_width - return the physical bit-width of the format
330 * @format: the format to check
331 *
332 * Return: The physical bit-width of the format, or a negative error code
333 * if unknown format.
334 */
335int snd_pcm_format_physical_width(snd_pcm_format_t format)
336{
337 int val;
338 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
339 return -EINVAL;
340 if ((val = pcm_formats[(INT)format].phys) == 0)
341 return -EINVAL;
342 return val;
343}
344
345EXPORT_SYMBOL(snd_pcm_format_physical_width);
346
347/**
348 * snd_pcm_format_size - return the byte size of samples on the given format
349 * @format: the format to check
350 * @samples: sampling rate
351 *
352 * Return: The byte size of the given samples for the format, or a
353 * negative error code if unknown format.
354 */
355ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
356{
357 int phys_width = snd_pcm_format_physical_width(format);
358 if (phys_width < 0)
359 return -EINVAL;
360 return samples * phys_width / 8;
361}
362
363EXPORT_SYMBOL(snd_pcm_format_size);
364
365/**
366 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
367 * @format: the format to check
368 *
369 * Return: The format pattern to fill or %NULL if error.
370 */
371const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
372{
373 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
374 return NULL;
375 if (! pcm_formats[(INT)format].phys)
376 return NULL;
377 return pcm_formats[(INT)format].silence;
378}
379
380EXPORT_SYMBOL(snd_pcm_format_silence_64);
381
382/**
383 * snd_pcm_format_set_silence - set the silence data on the buffer
384 * @format: the PCM format
385 * @data: the buffer pointer
386 * @samples: the number of samples to set silence
387 *
388 * Sets the silence data on the buffer for the given samples.
389 *
390 * Return: Zero if successful, or a negative error code on failure.
391 */
392int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
393{
394 int width;
395 unsigned char *dst, *pat;
396
397 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
398 return -EINVAL;
399 if (samples == 0)
400 return 0;
401 width = pcm_formats[(INT)format].phys; /* physical width */
402 pat = pcm_formats[(INT)format].silence;
403 if (! width)
404 return -EINVAL;
405 /* signed or 1 byte data */
406 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
407 unsigned int bytes = samples * width / 8;
408 memset(data, *pat, bytes);
409 return 0;
410 }
411 /* non-zero samples, fill using a loop */
412 width /= 8;
413 dst = data;
414#if 0
415 while (samples--) {
416 memcpy(dst, pat, width);
417 dst += width;
418 }
419#else
420 /* a bit optimization for constant width */
421 switch (width) {
422 case 2:
423 while (samples--) {
424 memcpy(dst, pat, 2);
425 dst += 2;
426 }
427 break;
428 case 3:
429 while (samples--) {
430 memcpy(dst, pat, 3);
431 dst += 3;
432 }
433 break;
434 case 4:
435 while (samples--) {
436 memcpy(dst, pat, 4);
437 dst += 4;
438 }
439 break;
440 case 8:
441 while (samples--) {
442 memcpy(dst, pat, 8);
443 dst += 8;
444 }
445 break;
446 }
447#endif
448 return 0;
449}
450
451EXPORT_SYMBOL(snd_pcm_format_set_silence);
452
453/**
454 * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
455 * @runtime: the runtime instance
456 *
457 * Determines the rate_min and rate_max fields from the rates bits of
458 * the given runtime->hw.
459 *
460 * Return: Zero if successful.
461 */
462int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
463{
464 int i;
465 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
466 if (runtime->hw.rates & (1 << i)) {
467 runtime->hw.rate_min = snd_pcm_known_rates.list[i];
468 break;
469 }
470 }
471 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
472 if (runtime->hw.rates & (1 << i)) {
473 runtime->hw.rate_max = snd_pcm_known_rates.list[i];
474 break;
475 }
476 }
477 return 0;
478}
479
480EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
481
482/**
483 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
484 * @rate: the sample rate to convert
485 *
486 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
487 * SNDRV_PCM_RATE_KNOT for an unknown rate.
488 */
489unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
490{
491 unsigned int i;
492
493 for (i = 0; i < snd_pcm_known_rates.count; i++)
494 if (snd_pcm_known_rates.list[i] == rate)
495 return 1u << i;
496 return SNDRV_PCM_RATE_KNOT;
497}
498EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
499
500/**
501 * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
502 * @rate_bit: the rate bit to convert
503 *
504 * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
505 * or 0 for an unknown rate bit.
506 */
507unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
508{
509 unsigned int i;
510
511 for (i = 0; i < snd_pcm_known_rates.count; i++)
512 if ((1u << i) == rate_bit)
513 return snd_pcm_known_rates.list[i];
514 return 0;
515}
516EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
517
518static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
519{
520 if (rates & SNDRV_PCM_RATE_CONTINUOUS)
521 return SNDRV_PCM_RATE_CONTINUOUS;
522 else if (rates & SNDRV_PCM_RATE_KNOT)
523 return SNDRV_PCM_RATE_KNOT;
524 return rates;
525}
526
527/**
528 * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
529 * @rates_a: The first rate mask
530 * @rates_b: The second rate mask
531 *
532 * This function computes the rates that are supported by both rate masks passed
533 * to the function. It will take care of the special handling of
534 * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
535 *
536 * Return: A rate mask containing the rates that are supported by both rates_a
537 * and rates_b.
538 */
539unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
540 unsigned int rates_b)
541{
542 rates_a = snd_pcm_rate_mask_sanitize(rates_a);
543 rates_b = snd_pcm_rate_mask_sanitize(rates_b);
544
545 if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
546 return rates_b;
547 else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
548 return rates_a;
549 else if (rates_a & SNDRV_PCM_RATE_KNOT)
550 return rates_b;
551 else if (rates_b & SNDRV_PCM_RATE_KNOT)
552 return rates_a;
553 return rates_a & rates_b;
554}
555EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
1/*
2 * PCM Interface - misc routines
3 * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Library General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/time.h>
23#include <sound/core.h>
24#include <sound/pcm.h>
25#define SND_PCM_FORMAT_UNKNOWN (-1)
26
27/* NOTE: "signed" prefix must be given below since the default char is
28 * unsigned on some architectures!
29 */
30struct pcm_format_data {
31 unsigned char width; /* bit width */
32 unsigned char phys; /* physical bit width */
33 signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
34 signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
35 unsigned char silence[8]; /* silence data to fill */
36};
37
38/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
39#define INT __force int
40
41static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
42 [SNDRV_PCM_FORMAT_S8] = {
43 .width = 8, .phys = 8, .le = -1, .signd = 1,
44 .silence = {},
45 },
46 [SNDRV_PCM_FORMAT_U8] = {
47 .width = 8, .phys = 8, .le = -1, .signd = 0,
48 .silence = { 0x80 },
49 },
50 [SNDRV_PCM_FORMAT_S16_LE] = {
51 .width = 16, .phys = 16, .le = 1, .signd = 1,
52 .silence = {},
53 },
54 [SNDRV_PCM_FORMAT_S16_BE] = {
55 .width = 16, .phys = 16, .le = 0, .signd = 1,
56 .silence = {},
57 },
58 [SNDRV_PCM_FORMAT_U16_LE] = {
59 .width = 16, .phys = 16, .le = 1, .signd = 0,
60 .silence = { 0x00, 0x80 },
61 },
62 [SNDRV_PCM_FORMAT_U16_BE] = {
63 .width = 16, .phys = 16, .le = 0, .signd = 0,
64 .silence = { 0x80, 0x00 },
65 },
66 [SNDRV_PCM_FORMAT_S24_LE] = {
67 .width = 24, .phys = 32, .le = 1, .signd = 1,
68 .silence = {},
69 },
70 [SNDRV_PCM_FORMAT_S24_BE] = {
71 .width = 24, .phys = 32, .le = 0, .signd = 1,
72 .silence = {},
73 },
74 [SNDRV_PCM_FORMAT_U24_LE] = {
75 .width = 24, .phys = 32, .le = 1, .signd = 0,
76 .silence = { 0x00, 0x00, 0x80 },
77 },
78 [SNDRV_PCM_FORMAT_U24_BE] = {
79 .width = 24, .phys = 32, .le = 0, .signd = 0,
80 .silence = { 0x00, 0x80, 0x00, 0x00 },
81 },
82 [SNDRV_PCM_FORMAT_S32_LE] = {
83 .width = 32, .phys = 32, .le = 1, .signd = 1,
84 .silence = {},
85 },
86 [SNDRV_PCM_FORMAT_S32_BE] = {
87 .width = 32, .phys = 32, .le = 0, .signd = 1,
88 .silence = {},
89 },
90 [SNDRV_PCM_FORMAT_U32_LE] = {
91 .width = 32, .phys = 32, .le = 1, .signd = 0,
92 .silence = { 0x00, 0x00, 0x00, 0x80 },
93 },
94 [SNDRV_PCM_FORMAT_U32_BE] = {
95 .width = 32, .phys = 32, .le = 0, .signd = 0,
96 .silence = { 0x80, 0x00, 0x00, 0x00 },
97 },
98 [SNDRV_PCM_FORMAT_FLOAT_LE] = {
99 .width = 32, .phys = 32, .le = 1, .signd = -1,
100 .silence = {},
101 },
102 [SNDRV_PCM_FORMAT_FLOAT_BE] = {
103 .width = 32, .phys = 32, .le = 0, .signd = -1,
104 .silence = {},
105 },
106 [SNDRV_PCM_FORMAT_FLOAT64_LE] = {
107 .width = 64, .phys = 64, .le = 1, .signd = -1,
108 .silence = {},
109 },
110 [SNDRV_PCM_FORMAT_FLOAT64_BE] = {
111 .width = 64, .phys = 64, .le = 0, .signd = -1,
112 .silence = {},
113 },
114 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
115 .width = 32, .phys = 32, .le = 1, .signd = -1,
116 .silence = {},
117 },
118 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
119 .width = 32, .phys = 32, .le = 0, .signd = -1,
120 .silence = {},
121 },
122 [SNDRV_PCM_FORMAT_MU_LAW] = {
123 .width = 8, .phys = 8, .le = -1, .signd = -1,
124 .silence = { 0x7f },
125 },
126 [SNDRV_PCM_FORMAT_A_LAW] = {
127 .width = 8, .phys = 8, .le = -1, .signd = -1,
128 .silence = { 0x55 },
129 },
130 [SNDRV_PCM_FORMAT_IMA_ADPCM] = {
131 .width = 4, .phys = 4, .le = -1, .signd = -1,
132 .silence = {},
133 },
134 [SNDRV_PCM_FORMAT_G723_24] = {
135 .width = 3, .phys = 3, .le = -1, .signd = -1,
136 .silence = {},
137 },
138 [SNDRV_PCM_FORMAT_G723_40] = {
139 .width = 5, .phys = 5, .le = -1, .signd = -1,
140 .silence = {},
141 },
142 /* FIXME: the following three formats are not defined properly yet */
143 [SNDRV_PCM_FORMAT_MPEG] = {
144 .le = -1, .signd = -1,
145 },
146 [SNDRV_PCM_FORMAT_GSM] = {
147 .le = -1, .signd = -1,
148 },
149 [SNDRV_PCM_FORMAT_SPECIAL] = {
150 .le = -1, .signd = -1,
151 },
152 [SNDRV_PCM_FORMAT_S24_3LE] = {
153 .width = 24, .phys = 24, .le = 1, .signd = 1,
154 .silence = {},
155 },
156 [SNDRV_PCM_FORMAT_S24_3BE] = {
157 .width = 24, .phys = 24, .le = 0, .signd = 1,
158 .silence = {},
159 },
160 [SNDRV_PCM_FORMAT_U24_3LE] = {
161 .width = 24, .phys = 24, .le = 1, .signd = 0,
162 .silence = { 0x00, 0x00, 0x80 },
163 },
164 [SNDRV_PCM_FORMAT_U24_3BE] = {
165 .width = 24, .phys = 24, .le = 0, .signd = 0,
166 .silence = { 0x80, 0x00, 0x00 },
167 },
168 [SNDRV_PCM_FORMAT_S20_3LE] = {
169 .width = 20, .phys = 24, .le = 1, .signd = 1,
170 .silence = {},
171 },
172 [SNDRV_PCM_FORMAT_S20_3BE] = {
173 .width = 20, .phys = 24, .le = 0, .signd = 1,
174 .silence = {},
175 },
176 [SNDRV_PCM_FORMAT_U20_3LE] = {
177 .width = 20, .phys = 24, .le = 1, .signd = 0,
178 .silence = { 0x00, 0x00, 0x08 },
179 },
180 [SNDRV_PCM_FORMAT_U20_3BE] = {
181 .width = 20, .phys = 24, .le = 0, .signd = 0,
182 .silence = { 0x08, 0x00, 0x00 },
183 },
184 [SNDRV_PCM_FORMAT_S18_3LE] = {
185 .width = 18, .phys = 24, .le = 1, .signd = 1,
186 .silence = {},
187 },
188 [SNDRV_PCM_FORMAT_S18_3BE] = {
189 .width = 18, .phys = 24, .le = 0, .signd = 1,
190 .silence = {},
191 },
192 [SNDRV_PCM_FORMAT_U18_3LE] = {
193 .width = 18, .phys = 24, .le = 1, .signd = 0,
194 .silence = { 0x00, 0x00, 0x02 },
195 },
196 [SNDRV_PCM_FORMAT_U18_3BE] = {
197 .width = 18, .phys = 24, .le = 0, .signd = 0,
198 .silence = { 0x02, 0x00, 0x00 },
199 },
200 [SNDRV_PCM_FORMAT_G723_24_1B] = {
201 .width = 3, .phys = 8, .le = -1, .signd = -1,
202 .silence = {},
203 },
204 [SNDRV_PCM_FORMAT_G723_40_1B] = {
205 .width = 5, .phys = 8, .le = -1, .signd = -1,
206 .silence = {},
207 },
208};
209
210
211/**
212 * snd_pcm_format_signed - Check the PCM format is signed linear
213 * @format: the format to check
214 *
215 * Returns 1 if the given PCM format is signed linear, 0 if unsigned
216 * linear, and a negative error code for non-linear formats.
217 */
218int snd_pcm_format_signed(snd_pcm_format_t format)
219{
220 int val;
221 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
222 return -EINVAL;
223 if ((val = pcm_formats[(INT)format].signd) < 0)
224 return -EINVAL;
225 return val;
226}
227
228EXPORT_SYMBOL(snd_pcm_format_signed);
229
230/**
231 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
232 * @format: the format to check
233 *
234 * Returns 1 if the given PCM format is unsigned linear, 0 if signed
235 * linear, and a negative error code for non-linear formats.
236 */
237int snd_pcm_format_unsigned(snd_pcm_format_t format)
238{
239 int val;
240
241 val = snd_pcm_format_signed(format);
242 if (val < 0)
243 return val;
244 return !val;
245}
246
247EXPORT_SYMBOL(snd_pcm_format_unsigned);
248
249/**
250 * snd_pcm_format_linear - Check the PCM format is linear
251 * @format: the format to check
252 *
253 * Returns 1 if the given PCM format is linear, 0 if not.
254 */
255int snd_pcm_format_linear(snd_pcm_format_t format)
256{
257 return snd_pcm_format_signed(format) >= 0;
258}
259
260EXPORT_SYMBOL(snd_pcm_format_linear);
261
262/**
263 * snd_pcm_format_little_endian - Check the PCM format is little-endian
264 * @format: the format to check
265 *
266 * Returns 1 if the given PCM format is little-endian, 0 if
267 * big-endian, or a negative error code if endian not specified.
268 */
269int snd_pcm_format_little_endian(snd_pcm_format_t format)
270{
271 int val;
272 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
273 return -EINVAL;
274 if ((val = pcm_formats[(INT)format].le) < 0)
275 return -EINVAL;
276 return val;
277}
278
279EXPORT_SYMBOL(snd_pcm_format_little_endian);
280
281/**
282 * snd_pcm_format_big_endian - Check the PCM format is big-endian
283 * @format: the format to check
284 *
285 * Returns 1 if the given PCM format is big-endian, 0 if
286 * little-endian, or a negative error code if endian not specified.
287 */
288int snd_pcm_format_big_endian(snd_pcm_format_t format)
289{
290 int val;
291
292 val = snd_pcm_format_little_endian(format);
293 if (val < 0)
294 return val;
295 return !val;
296}
297
298EXPORT_SYMBOL(snd_pcm_format_big_endian);
299
300/**
301 * snd_pcm_format_width - return the bit-width of the format
302 * @format: the format to check
303 *
304 * Returns the bit-width of the format, or a negative error code
305 * if unknown format.
306 */
307int snd_pcm_format_width(snd_pcm_format_t format)
308{
309 int val;
310 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
311 return -EINVAL;
312 if ((val = pcm_formats[(INT)format].width) == 0)
313 return -EINVAL;
314 return val;
315}
316
317EXPORT_SYMBOL(snd_pcm_format_width);
318
319/**
320 * snd_pcm_format_physical_width - return the physical bit-width of the format
321 * @format: the format to check
322 *
323 * Returns the physical bit-width of the format, or a negative error code
324 * if unknown format.
325 */
326int snd_pcm_format_physical_width(snd_pcm_format_t format)
327{
328 int val;
329 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
330 return -EINVAL;
331 if ((val = pcm_formats[(INT)format].phys) == 0)
332 return -EINVAL;
333 return val;
334}
335
336EXPORT_SYMBOL(snd_pcm_format_physical_width);
337
338/**
339 * snd_pcm_format_size - return the byte size of samples on the given format
340 * @format: the format to check
341 * @samples: sampling rate
342 *
343 * Returns the byte size of the given samples for the format, or a
344 * negative error code if unknown format.
345 */
346ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
347{
348 int phys_width = snd_pcm_format_physical_width(format);
349 if (phys_width < 0)
350 return -EINVAL;
351 return samples * phys_width / 8;
352}
353
354EXPORT_SYMBOL(snd_pcm_format_size);
355
356/**
357 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
358 * @format: the format to check
359 *
360 * Returns the format pattern to fill or NULL if error.
361 */
362const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
363{
364 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
365 return NULL;
366 if (! pcm_formats[(INT)format].phys)
367 return NULL;
368 return pcm_formats[(INT)format].silence;
369}
370
371EXPORT_SYMBOL(snd_pcm_format_silence_64);
372
373/**
374 * snd_pcm_format_set_silence - set the silence data on the buffer
375 * @format: the PCM format
376 * @data: the buffer pointer
377 * @samples: the number of samples to set silence
378 *
379 * Sets the silence data on the buffer for the given samples.
380 *
381 * Returns zero if successful, or a negative error code on failure.
382 */
383int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
384{
385 int width;
386 unsigned char *dst, *pat;
387
388 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
389 return -EINVAL;
390 if (samples == 0)
391 return 0;
392 width = pcm_formats[(INT)format].phys; /* physical width */
393 pat = pcm_formats[(INT)format].silence;
394 if (! width)
395 return -EINVAL;
396 /* signed or 1 byte data */
397 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
398 unsigned int bytes = samples * width / 8;
399 memset(data, *pat, bytes);
400 return 0;
401 }
402 /* non-zero samples, fill using a loop */
403 width /= 8;
404 dst = data;
405#if 0
406 while (samples--) {
407 memcpy(dst, pat, width);
408 dst += width;
409 }
410#else
411 /* a bit optimization for constant width */
412 switch (width) {
413 case 2:
414 while (samples--) {
415 memcpy(dst, pat, 2);
416 dst += 2;
417 }
418 break;
419 case 3:
420 while (samples--) {
421 memcpy(dst, pat, 3);
422 dst += 3;
423 }
424 break;
425 case 4:
426 while (samples--) {
427 memcpy(dst, pat, 4);
428 dst += 4;
429 }
430 break;
431 case 8:
432 while (samples--) {
433 memcpy(dst, pat, 8);
434 dst += 8;
435 }
436 break;
437 }
438#endif
439 return 0;
440}
441
442EXPORT_SYMBOL(snd_pcm_format_set_silence);
443
444/**
445 * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
446 * @runtime: the runtime instance
447 *
448 * Determines the rate_min and rate_max fields from the rates bits of
449 * the given runtime->hw.
450 *
451 * Returns zero if successful.
452 */
453int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
454{
455 int i;
456 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
457 if (runtime->hw.rates & (1 << i)) {
458 runtime->hw.rate_min = snd_pcm_known_rates.list[i];
459 break;
460 }
461 }
462 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
463 if (runtime->hw.rates & (1 << i)) {
464 runtime->hw.rate_max = snd_pcm_known_rates.list[i];
465 break;
466 }
467 }
468 return 0;
469}
470
471EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
472
473/**
474 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
475 * @rate: the sample rate to convert
476 *
477 * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
478 * SNDRV_PCM_RATE_KNOT for an unknown rate.
479 */
480unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
481{
482 unsigned int i;
483
484 for (i = 0; i < snd_pcm_known_rates.count; i++)
485 if (snd_pcm_known_rates.list[i] == rate)
486 return 1u << i;
487 return SNDRV_PCM_RATE_KNOT;
488}
489EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);