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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
27#include "pcm_local.h"
28
29#define SND_PCM_FORMAT_UNKNOWN (-1)
30
31/* NOTE: "signed" prefix must be given below since the default char is
32 * unsigned on some architectures!
33 */
34struct pcm_format_data {
35 unsigned char width; /* bit width */
36 unsigned char phys; /* physical bit width */
37 signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
38 signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
39 unsigned char silence[8]; /* silence data to fill */
40};
41
42/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
43#define INT __force int
44
45static bool valid_format(snd_pcm_format_t format)
46{
47 return (INT)format >= 0 && (INT)format <= (INT)SNDRV_PCM_FORMAT_LAST;
48}
49
50static const struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
51 [SNDRV_PCM_FORMAT_S8] = {
52 .width = 8, .phys = 8, .le = -1, .signd = 1,
53 .silence = {},
54 },
55 [SNDRV_PCM_FORMAT_U8] = {
56 .width = 8, .phys = 8, .le = -1, .signd = 0,
57 .silence = { 0x80 },
58 },
59 [SNDRV_PCM_FORMAT_S16_LE] = {
60 .width = 16, .phys = 16, .le = 1, .signd = 1,
61 .silence = {},
62 },
63 [SNDRV_PCM_FORMAT_S16_BE] = {
64 .width = 16, .phys = 16, .le = 0, .signd = 1,
65 .silence = {},
66 },
67 [SNDRV_PCM_FORMAT_U16_LE] = {
68 .width = 16, .phys = 16, .le = 1, .signd = 0,
69 .silence = { 0x00, 0x80 },
70 },
71 [SNDRV_PCM_FORMAT_U16_BE] = {
72 .width = 16, .phys = 16, .le = 0, .signd = 0,
73 .silence = { 0x80, 0x00 },
74 },
75 [SNDRV_PCM_FORMAT_S24_LE] = {
76 .width = 24, .phys = 32, .le = 1, .signd = 1,
77 .silence = {},
78 },
79 [SNDRV_PCM_FORMAT_S24_BE] = {
80 .width = 24, .phys = 32, .le = 0, .signd = 1,
81 .silence = {},
82 },
83 [SNDRV_PCM_FORMAT_U24_LE] = {
84 .width = 24, .phys = 32, .le = 1, .signd = 0,
85 .silence = { 0x00, 0x00, 0x80 },
86 },
87 [SNDRV_PCM_FORMAT_U24_BE] = {
88 .width = 24, .phys = 32, .le = 0, .signd = 0,
89 .silence = { 0x00, 0x80, 0x00, 0x00 },
90 },
91 [SNDRV_PCM_FORMAT_S32_LE] = {
92 .width = 32, .phys = 32, .le = 1, .signd = 1,
93 .silence = {},
94 },
95 [SNDRV_PCM_FORMAT_S32_BE] = {
96 .width = 32, .phys = 32, .le = 0, .signd = 1,
97 .silence = {},
98 },
99 [SNDRV_PCM_FORMAT_U32_LE] = {
100 .width = 32, .phys = 32, .le = 1, .signd = 0,
101 .silence = { 0x00, 0x00, 0x00, 0x80 },
102 },
103 [SNDRV_PCM_FORMAT_U32_BE] = {
104 .width = 32, .phys = 32, .le = 0, .signd = 0,
105 .silence = { 0x80, 0x00, 0x00, 0x00 },
106 },
107 [SNDRV_PCM_FORMAT_FLOAT_LE] = {
108 .width = 32, .phys = 32, .le = 1, .signd = -1,
109 .silence = {},
110 },
111 [SNDRV_PCM_FORMAT_FLOAT_BE] = {
112 .width = 32, .phys = 32, .le = 0, .signd = -1,
113 .silence = {},
114 },
115 [SNDRV_PCM_FORMAT_FLOAT64_LE] = {
116 .width = 64, .phys = 64, .le = 1, .signd = -1,
117 .silence = {},
118 },
119 [SNDRV_PCM_FORMAT_FLOAT64_BE] = {
120 .width = 64, .phys = 64, .le = 0, .signd = -1,
121 .silence = {},
122 },
123 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
124 .width = 32, .phys = 32, .le = 1, .signd = -1,
125 .silence = {},
126 },
127 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
128 .width = 32, .phys = 32, .le = 0, .signd = -1,
129 .silence = {},
130 },
131 [SNDRV_PCM_FORMAT_MU_LAW] = {
132 .width = 8, .phys = 8, .le = -1, .signd = -1,
133 .silence = { 0x7f },
134 },
135 [SNDRV_PCM_FORMAT_A_LAW] = {
136 .width = 8, .phys = 8, .le = -1, .signd = -1,
137 .silence = { 0x55 },
138 },
139 [SNDRV_PCM_FORMAT_IMA_ADPCM] = {
140 .width = 4, .phys = 4, .le = -1, .signd = -1,
141 .silence = {},
142 },
143 [SNDRV_PCM_FORMAT_G723_24] = {
144 .width = 3, .phys = 3, .le = -1, .signd = -1,
145 .silence = {},
146 },
147 [SNDRV_PCM_FORMAT_G723_40] = {
148 .width = 5, .phys = 5, .le = -1, .signd = -1,
149 .silence = {},
150 },
151 [SNDRV_PCM_FORMAT_DSD_U8] = {
152 .width = 8, .phys = 8, .le = 1, .signd = 0,
153 .silence = { 0x69 },
154 },
155 [SNDRV_PCM_FORMAT_DSD_U16_LE] = {
156 .width = 16, .phys = 16, .le = 1, .signd = 0,
157 .silence = { 0x69, 0x69 },
158 },
159 [SNDRV_PCM_FORMAT_DSD_U32_LE] = {
160 .width = 32, .phys = 32, .le = 1, .signd = 0,
161 .silence = { 0x69, 0x69, 0x69, 0x69 },
162 },
163 [SNDRV_PCM_FORMAT_DSD_U16_BE] = {
164 .width = 16, .phys = 16, .le = 0, .signd = 0,
165 .silence = { 0x69, 0x69 },
166 },
167 [SNDRV_PCM_FORMAT_DSD_U32_BE] = {
168 .width = 32, .phys = 32, .le = 0, .signd = 0,
169 .silence = { 0x69, 0x69, 0x69, 0x69 },
170 },
171 /* FIXME: the following two formats are not defined properly yet */
172 [SNDRV_PCM_FORMAT_MPEG] = {
173 .le = -1, .signd = -1,
174 },
175 [SNDRV_PCM_FORMAT_GSM] = {
176 .le = -1, .signd = -1,
177 },
178 [SNDRV_PCM_FORMAT_S20_LE] = {
179 .width = 20, .phys = 32, .le = 1, .signd = 1,
180 .silence = {},
181 },
182 [SNDRV_PCM_FORMAT_S20_BE] = {
183 .width = 20, .phys = 32, .le = 0, .signd = 1,
184 .silence = {},
185 },
186 [SNDRV_PCM_FORMAT_U20_LE] = {
187 .width = 20, .phys = 32, .le = 1, .signd = 0,
188 .silence = { 0x00, 0x00, 0x08, 0x00 },
189 },
190 [SNDRV_PCM_FORMAT_U20_BE] = {
191 .width = 20, .phys = 32, .le = 0, .signd = 0,
192 .silence = { 0x00, 0x08, 0x00, 0x00 },
193 },
194 /* FIXME: the following format is not defined properly yet */
195 [SNDRV_PCM_FORMAT_SPECIAL] = {
196 .le = -1, .signd = -1,
197 },
198 [SNDRV_PCM_FORMAT_S24_3LE] = {
199 .width = 24, .phys = 24, .le = 1, .signd = 1,
200 .silence = {},
201 },
202 [SNDRV_PCM_FORMAT_S24_3BE] = {
203 .width = 24, .phys = 24, .le = 0, .signd = 1,
204 .silence = {},
205 },
206 [SNDRV_PCM_FORMAT_U24_3LE] = {
207 .width = 24, .phys = 24, .le = 1, .signd = 0,
208 .silence = { 0x00, 0x00, 0x80 },
209 },
210 [SNDRV_PCM_FORMAT_U24_3BE] = {
211 .width = 24, .phys = 24, .le = 0, .signd = 0,
212 .silence = { 0x80, 0x00, 0x00 },
213 },
214 [SNDRV_PCM_FORMAT_S20_3LE] = {
215 .width = 20, .phys = 24, .le = 1, .signd = 1,
216 .silence = {},
217 },
218 [SNDRV_PCM_FORMAT_S20_3BE] = {
219 .width = 20, .phys = 24, .le = 0, .signd = 1,
220 .silence = {},
221 },
222 [SNDRV_PCM_FORMAT_U20_3LE] = {
223 .width = 20, .phys = 24, .le = 1, .signd = 0,
224 .silence = { 0x00, 0x00, 0x08 },
225 },
226 [SNDRV_PCM_FORMAT_U20_3BE] = {
227 .width = 20, .phys = 24, .le = 0, .signd = 0,
228 .silence = { 0x08, 0x00, 0x00 },
229 },
230 [SNDRV_PCM_FORMAT_S18_3LE] = {
231 .width = 18, .phys = 24, .le = 1, .signd = 1,
232 .silence = {},
233 },
234 [SNDRV_PCM_FORMAT_S18_3BE] = {
235 .width = 18, .phys = 24, .le = 0, .signd = 1,
236 .silence = {},
237 },
238 [SNDRV_PCM_FORMAT_U18_3LE] = {
239 .width = 18, .phys = 24, .le = 1, .signd = 0,
240 .silence = { 0x00, 0x00, 0x02 },
241 },
242 [SNDRV_PCM_FORMAT_U18_3BE] = {
243 .width = 18, .phys = 24, .le = 0, .signd = 0,
244 .silence = { 0x02, 0x00, 0x00 },
245 },
246 [SNDRV_PCM_FORMAT_G723_24_1B] = {
247 .width = 3, .phys = 8, .le = -1, .signd = -1,
248 .silence = {},
249 },
250 [SNDRV_PCM_FORMAT_G723_40_1B] = {
251 .width = 5, .phys = 8, .le = -1, .signd = -1,
252 .silence = {},
253 },
254};
255
256
257/**
258 * snd_pcm_format_signed - Check the PCM format is signed linear
259 * @format: the format to check
260 *
261 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
262 * linear, and a negative error code for non-linear formats.
263 */
264int snd_pcm_format_signed(snd_pcm_format_t format)
265{
266 int val;
267 if (!valid_format(format))
268 return -EINVAL;
269 if ((val = pcm_formats[(INT)format].signd) < 0)
270 return -EINVAL;
271 return val;
272}
273EXPORT_SYMBOL(snd_pcm_format_signed);
274
275/**
276 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
277 * @format: the format to check
278 *
279 * Return: 1 if the given PCM format is unsigned linear, 0 if signed
280 * linear, and a negative error code for non-linear formats.
281 */
282int snd_pcm_format_unsigned(snd_pcm_format_t format)
283{
284 int val;
285
286 val = snd_pcm_format_signed(format);
287 if (val < 0)
288 return val;
289 return !val;
290}
291EXPORT_SYMBOL(snd_pcm_format_unsigned);
292
293/**
294 * snd_pcm_format_linear - Check the PCM format is linear
295 * @format: the format to check
296 *
297 * Return: 1 if the given PCM format is linear, 0 if not.
298 */
299int snd_pcm_format_linear(snd_pcm_format_t format)
300{
301 return snd_pcm_format_signed(format) >= 0;
302}
303EXPORT_SYMBOL(snd_pcm_format_linear);
304
305/**
306 * snd_pcm_format_little_endian - Check the PCM format is little-endian
307 * @format: the format to check
308 *
309 * Return: 1 if the given PCM format is little-endian, 0 if
310 * big-endian, or a negative error code if endian not specified.
311 */
312int snd_pcm_format_little_endian(snd_pcm_format_t format)
313{
314 int val;
315 if (!valid_format(format))
316 return -EINVAL;
317 if ((val = pcm_formats[(INT)format].le) < 0)
318 return -EINVAL;
319 return val;
320}
321EXPORT_SYMBOL(snd_pcm_format_little_endian);
322
323/**
324 * snd_pcm_format_big_endian - Check the PCM format is big-endian
325 * @format: the format to check
326 *
327 * Return: 1 if the given PCM format is big-endian, 0 if
328 * little-endian, or a negative error code if endian not specified.
329 */
330int snd_pcm_format_big_endian(snd_pcm_format_t format)
331{
332 int val;
333
334 val = snd_pcm_format_little_endian(format);
335 if (val < 0)
336 return val;
337 return !val;
338}
339EXPORT_SYMBOL(snd_pcm_format_big_endian);
340
341/**
342 * snd_pcm_format_width - return the bit-width of the format
343 * @format: the format to check
344 *
345 * Return: The bit-width of the format, or a negative error code
346 * if unknown format.
347 */
348int snd_pcm_format_width(snd_pcm_format_t format)
349{
350 int val;
351 if (!valid_format(format))
352 return -EINVAL;
353 if ((val = pcm_formats[(INT)format].width) == 0)
354 return -EINVAL;
355 return val;
356}
357EXPORT_SYMBOL(snd_pcm_format_width);
358
359/**
360 * snd_pcm_format_physical_width - return the physical bit-width of the format
361 * @format: the format to check
362 *
363 * Return: The physical bit-width of the format, or a negative error code
364 * if unknown format.
365 */
366int snd_pcm_format_physical_width(snd_pcm_format_t format)
367{
368 int val;
369 if (!valid_format(format))
370 return -EINVAL;
371 if ((val = pcm_formats[(INT)format].phys) == 0)
372 return -EINVAL;
373 return val;
374}
375EXPORT_SYMBOL(snd_pcm_format_physical_width);
376
377/**
378 * snd_pcm_format_size - return the byte size of samples on the given format
379 * @format: the format to check
380 * @samples: sampling rate
381 *
382 * Return: The byte size of the given samples for the format, or a
383 * negative error code if unknown format.
384 */
385ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
386{
387 int phys_width = snd_pcm_format_physical_width(format);
388 if (phys_width < 0)
389 return -EINVAL;
390 return samples * phys_width / 8;
391}
392EXPORT_SYMBOL(snd_pcm_format_size);
393
394/**
395 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
396 * @format: the format to check
397 *
398 * Return: The format pattern to fill or %NULL if error.
399 */
400const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
401{
402 if (!valid_format(format))
403 return NULL;
404 if (! pcm_formats[(INT)format].phys)
405 return NULL;
406 return pcm_formats[(INT)format].silence;
407}
408EXPORT_SYMBOL(snd_pcm_format_silence_64);
409
410/**
411 * snd_pcm_format_set_silence - set the silence data on the buffer
412 * @format: the PCM format
413 * @data: the buffer pointer
414 * @samples: the number of samples to set silence
415 *
416 * Sets the silence data on the buffer for the given samples.
417 *
418 * Return: Zero if successful, or a negative error code on failure.
419 */
420int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
421{
422 int width;
423 unsigned char *dst;
424 const unsigned char *pat;
425
426 if (!valid_format(format))
427 return -EINVAL;
428 if (samples == 0)
429 return 0;
430 width = pcm_formats[(INT)format].phys; /* physical width */
431 pat = pcm_formats[(INT)format].silence;
432 if (! width)
433 return -EINVAL;
434 /* signed or 1 byte data */
435 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
436 unsigned int bytes = samples * width / 8;
437 memset(data, *pat, bytes);
438 return 0;
439 }
440 /* non-zero samples, fill using a loop */
441 width /= 8;
442 dst = data;
443#if 0
444 while (samples--) {
445 memcpy(dst, pat, width);
446 dst += width;
447 }
448#else
449 /* a bit optimization for constant width */
450 switch (width) {
451 case 2:
452 while (samples--) {
453 memcpy(dst, pat, 2);
454 dst += 2;
455 }
456 break;
457 case 3:
458 while (samples--) {
459 memcpy(dst, pat, 3);
460 dst += 3;
461 }
462 break;
463 case 4:
464 while (samples--) {
465 memcpy(dst, pat, 4);
466 dst += 4;
467 }
468 break;
469 case 8:
470 while (samples--) {
471 memcpy(dst, pat, 8);
472 dst += 8;
473 }
474 break;
475 }
476#endif
477 return 0;
478}
479EXPORT_SYMBOL(snd_pcm_format_set_silence);
480
481/**
482 * snd_pcm_hw_limit_rates - determine rate_min/rate_max fields
483 * @hw: the pcm hw instance
484 *
485 * Determines the rate_min and rate_max fields from the rates bits of
486 * the given hw.
487 *
488 * Return: Zero if successful.
489 */
490int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw)
491{
492 int i;
493 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
494 if (hw->rates & (1 << i)) {
495 hw->rate_min = snd_pcm_known_rates.list[i];
496 break;
497 }
498 }
499 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
500 if (hw->rates & (1 << i)) {
501 hw->rate_max = snd_pcm_known_rates.list[i];
502 break;
503 }
504 }
505 return 0;
506}
507EXPORT_SYMBOL(snd_pcm_hw_limit_rates);
508
509/**
510 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
511 * @rate: the sample rate to convert
512 *
513 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
514 * SNDRV_PCM_RATE_KNOT for an unknown rate.
515 */
516unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
517{
518 unsigned int i;
519
520 for (i = 0; i < snd_pcm_known_rates.count; i++)
521 if (snd_pcm_known_rates.list[i] == rate)
522 return 1u << i;
523 return SNDRV_PCM_RATE_KNOT;
524}
525EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
526
527/**
528 * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
529 * @rate_bit: the rate bit to convert
530 *
531 * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
532 * or 0 for an unknown rate bit.
533 */
534unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
535{
536 unsigned int i;
537
538 for (i = 0; i < snd_pcm_known_rates.count; i++)
539 if ((1u << i) == rate_bit)
540 return snd_pcm_known_rates.list[i];
541 return 0;
542}
543EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
544
545static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
546{
547 if (rates & SNDRV_PCM_RATE_CONTINUOUS)
548 return SNDRV_PCM_RATE_CONTINUOUS;
549 else if (rates & SNDRV_PCM_RATE_KNOT)
550 return SNDRV_PCM_RATE_KNOT;
551 return rates;
552}
553
554/**
555 * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
556 * @rates_a: The first rate mask
557 * @rates_b: The second rate mask
558 *
559 * This function computes the rates that are supported by both rate masks passed
560 * to the function. It will take care of the special handling of
561 * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
562 *
563 * Return: A rate mask containing the rates that are supported by both rates_a
564 * and rates_b.
565 */
566unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
567 unsigned int rates_b)
568{
569 rates_a = snd_pcm_rate_mask_sanitize(rates_a);
570 rates_b = snd_pcm_rate_mask_sanitize(rates_b);
571
572 if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
573 return rates_b;
574 else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
575 return rates_a;
576 else if (rates_a & SNDRV_PCM_RATE_KNOT)
577 return rates_b;
578 else if (rates_b & SNDRV_PCM_RATE_KNOT)
579 return rates_a;
580 return rates_a & rates_b;
581}
582EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
583
584/**
585 * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit
586 * @rate_min: the minimum sample rate
587 * @rate_max: the maximum sample rate
588 *
589 * This function has an implicit assumption: the rates in the given range have
590 * only the pre-defined rates like 44100 or 16000.
591 *
592 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range,
593 * or SNDRV_PCM_RATE_KNOT for an unknown range.
594 */
595unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
596 unsigned int rate_max)
597{
598 unsigned int rates = 0;
599 int i;
600
601 for (i = 0; i < snd_pcm_known_rates.count; i++) {
602 if (snd_pcm_known_rates.list[i] >= rate_min
603 && snd_pcm_known_rates.list[i] <= rate_max)
604 rates |= 1 << i;
605 }
606
607 if (!rates)
608 rates = SNDRV_PCM_RATE_KNOT;
609
610 return rates;
611}
612EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);
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);