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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * PCM Interface - misc routines
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/time.h>
Paul Gortmakerd81a6d72011-09-22 09:34:58 -040023#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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
Clemens Ladischfea952e2011-02-14 11:00:47 +010039/* 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] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 [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,
Jaroslav Kysela67a7be72007-12-13 10:36:03 +010081 .silence = { 0x00, 0x80, 0x00, 0x00 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 },
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 },
Ben Collins15c0cee62010-05-28 11:43:45 -0400135 [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 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800143 [SNDRV_PCM_FORMAT_DSD_U8] = {
144 .width = 8, .phys = 8, .le = 1, .signd = 0,
Takashi Iwai94a988a2014-08-22 11:18:48 +0200145 .silence = { 0x69 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800146 },
147 [SNDRV_PCM_FORMAT_DSD_U16_LE] = {
148 .width = 16, .phys = 16, .le = 1, .signd = 0,
Takashi Iwai94a988a2014-08-22 11:18:48 +0200149 .silence = { 0x69, 0x69 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800150 },
Jurgen Kramerd4288d32014-09-05 10:47:56 +0200151 [SNDRV_PCM_FORMAT_DSD_U32_LE] = {
152 .width = 32, .phys = 32, .le = 1, .signd = 0,
153 .silence = { 0x69, 0x69, 0x69, 0x69 },
154 },
Jussi Laakod42472e2014-11-21 16:04:46 +0200155 [SNDRV_PCM_FORMAT_DSD_U16_BE] = {
156 .width = 16, .phys = 16, .le = 0, .signd = 0,
157 .silence = { 0x69, 0x69 },
158 },
159 [SNDRV_PCM_FORMAT_DSD_U32_BE] = {
160 .width = 32, .phys = 32, .le = 0, .signd = 0,
161 .silence = { 0x69, 0x69, 0x69, 0x69 },
162 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 /* FIXME: the following three formats are not defined properly yet */
164 [SNDRV_PCM_FORMAT_MPEG] = {
165 .le = -1, .signd = -1,
166 },
167 [SNDRV_PCM_FORMAT_GSM] = {
168 .le = -1, .signd = -1,
169 },
170 [SNDRV_PCM_FORMAT_SPECIAL] = {
171 .le = -1, .signd = -1,
172 },
173 [SNDRV_PCM_FORMAT_S24_3LE] = {
174 .width = 24, .phys = 24, .le = 1, .signd = 1,
175 .silence = {},
176 },
177 [SNDRV_PCM_FORMAT_S24_3BE] = {
178 .width = 24, .phys = 24, .le = 0, .signd = 1,
179 .silence = {},
180 },
181 [SNDRV_PCM_FORMAT_U24_3LE] = {
182 .width = 24, .phys = 24, .le = 1, .signd = 0,
183 .silence = { 0x00, 0x00, 0x80 },
184 },
185 [SNDRV_PCM_FORMAT_U24_3BE] = {
186 .width = 24, .phys = 24, .le = 0, .signd = 0,
187 .silence = { 0x80, 0x00, 0x00 },
188 },
189 [SNDRV_PCM_FORMAT_S20_3LE] = {
190 .width = 20, .phys = 24, .le = 1, .signd = 1,
191 .silence = {},
192 },
193 [SNDRV_PCM_FORMAT_S20_3BE] = {
194 .width = 20, .phys = 24, .le = 0, .signd = 1,
195 .silence = {},
196 },
197 [SNDRV_PCM_FORMAT_U20_3LE] = {
198 .width = 20, .phys = 24, .le = 1, .signd = 0,
199 .silence = { 0x00, 0x00, 0x08 },
200 },
201 [SNDRV_PCM_FORMAT_U20_3BE] = {
202 .width = 20, .phys = 24, .le = 0, .signd = 0,
203 .silence = { 0x08, 0x00, 0x00 },
204 },
205 [SNDRV_PCM_FORMAT_S18_3LE] = {
206 .width = 18, .phys = 24, .le = 1, .signd = 1,
207 .silence = {},
208 },
209 [SNDRV_PCM_FORMAT_S18_3BE] = {
210 .width = 18, .phys = 24, .le = 0, .signd = 1,
211 .silence = {},
212 },
213 [SNDRV_PCM_FORMAT_U18_3LE] = {
214 .width = 18, .phys = 24, .le = 1, .signd = 0,
215 .silence = { 0x00, 0x00, 0x02 },
216 },
217 [SNDRV_PCM_FORMAT_U18_3BE] = {
218 .width = 18, .phys = 24, .le = 0, .signd = 0,
219 .silence = { 0x02, 0x00, 0x00 },
220 },
Ben Collins15c0cee62010-05-28 11:43:45 -0400221 [SNDRV_PCM_FORMAT_G723_24_1B] = {
222 .width = 3, .phys = 8, .le = -1, .signd = -1,
223 .silence = {},
224 },
225 [SNDRV_PCM_FORMAT_G723_40_1B] = {
226 .width = 5, .phys = 8, .le = -1, .signd = -1,
227 .silence = {},
228 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229};
230
231
232/**
233 * snd_pcm_format_signed - Check the PCM format is signed linear
234 * @format: the format to check
235 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100236 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 * linear, and a negative error code for non-linear formats.
238 */
239int snd_pcm_format_signed(snd_pcm_format_t format)
240{
241 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100242 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100244 if ((val = pcm_formats[(INT)format].signd) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return -EINVAL;
246 return val;
247}
248
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200249EXPORT_SYMBOL(snd_pcm_format_signed);
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251/**
252 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
253 * @format: the format to check
254 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100255 * Return: 1 if the given PCM format is unsigned linear, 0 if signed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 * linear, and a negative error code for non-linear formats.
257 */
258int snd_pcm_format_unsigned(snd_pcm_format_t format)
259{
260 int val;
261
262 val = snd_pcm_format_signed(format);
263 if (val < 0)
264 return val;
265 return !val;
266}
267
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200268EXPORT_SYMBOL(snd_pcm_format_unsigned);
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270/**
271 * snd_pcm_format_linear - Check the PCM format is linear
272 * @format: the format to check
273 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100274 * Return: 1 if the given PCM format is linear, 0 if not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 */
276int snd_pcm_format_linear(snd_pcm_format_t format)
277{
278 return snd_pcm_format_signed(format) >= 0;
279}
280
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200281EXPORT_SYMBOL(snd_pcm_format_linear);
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283/**
284 * snd_pcm_format_little_endian - Check the PCM format is little-endian
285 * @format: the format to check
286 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100287 * Return: 1 if the given PCM format is little-endian, 0 if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 * big-endian, or a negative error code if endian not specified.
289 */
290int snd_pcm_format_little_endian(snd_pcm_format_t format)
291{
292 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100293 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100295 if ((val = pcm_formats[(INT)format].le) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return -EINVAL;
297 return val;
298}
299
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200300EXPORT_SYMBOL(snd_pcm_format_little_endian);
301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302/**
303 * snd_pcm_format_big_endian - Check the PCM format is big-endian
304 * @format: the format to check
305 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100306 * Return: 1 if the given PCM format is big-endian, 0 if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 * little-endian, or a negative error code if endian not specified.
308 */
309int snd_pcm_format_big_endian(snd_pcm_format_t format)
310{
311 int val;
312
313 val = snd_pcm_format_little_endian(format);
314 if (val < 0)
315 return val;
316 return !val;
317}
318
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200319EXPORT_SYMBOL(snd_pcm_format_big_endian);
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 * snd_pcm_format_width - return the bit-width of the format
323 * @format: the format to check
324 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100325 * Return: The bit-width of the format, or a negative error code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 * if unknown format.
327 */
328int snd_pcm_format_width(snd_pcm_format_t format)
329{
330 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100331 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100333 if ((val = pcm_formats[(INT)format].width) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return -EINVAL;
335 return val;
336}
337
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200338EXPORT_SYMBOL(snd_pcm_format_width);
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340/**
341 * snd_pcm_format_physical_width - return the physical bit-width of the format
342 * @format: the format to check
343 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100344 * Return: The physical bit-width of the format, or a negative error code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 * if unknown format.
346 */
347int snd_pcm_format_physical_width(snd_pcm_format_t format)
348{
349 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100350 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100352 if ((val = pcm_formats[(INT)format].phys) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return -EINVAL;
354 return val;
355}
356
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200357EXPORT_SYMBOL(snd_pcm_format_physical_width);
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359/**
360 * snd_pcm_format_size - return the byte size of samples on the given format
361 * @format: the format to check
Randy Dunlapa66547f2008-10-17 11:28:11 -0700362 * @samples: sampling rate
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100364 * Return: The byte size of the given samples for the format, or a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 * negative error code if unknown format.
366 */
367ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
368{
369 int phys_width = snd_pcm_format_physical_width(format);
370 if (phys_width < 0)
371 return -EINVAL;
372 return samples * phys_width / 8;
373}
374
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200375EXPORT_SYMBOL(snd_pcm_format_size);
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377/**
378 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
379 * @format: the format to check
380 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100381 * Return: The format pattern to fill or %NULL if error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 */
383const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
384{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100385 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 return NULL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100387 if (! pcm_formats[(INT)format].phys)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 return NULL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100389 return pcm_formats[(INT)format].silence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200392EXPORT_SYMBOL(snd_pcm_format_silence_64);
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394/**
395 * snd_pcm_format_set_silence - set the silence data on the buffer
396 * @format: the PCM format
397 * @data: the buffer pointer
398 * @samples: the number of samples to set silence
399 *
400 * Sets the silence data on the buffer for the given samples.
401 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100402 * Return: Zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 */
404int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
405{
406 int width;
407 unsigned char *dst, *pat;
408
Clemens Ladischfea952e2011-02-14 11:00:47 +0100409 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return -EINVAL;
411 if (samples == 0)
412 return 0;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100413 width = pcm_formats[(INT)format].phys; /* physical width */
414 pat = pcm_formats[(INT)format].silence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (! width)
416 return -EINVAL;
417 /* signed or 1 byte data */
Clemens Ladischfea952e2011-02-14 11:00:47 +0100418 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 unsigned int bytes = samples * width / 8;
420 memset(data, *pat, bytes);
421 return 0;
422 }
423 /* non-zero samples, fill using a loop */
424 width /= 8;
425 dst = data;
426#if 0
427 while (samples--) {
428 memcpy(dst, pat, width);
429 dst += width;
430 }
431#else
432 /* a bit optimization for constant width */
433 switch (width) {
434 case 2:
435 while (samples--) {
436 memcpy(dst, pat, 2);
437 dst += 2;
438 }
439 break;
440 case 3:
441 while (samples--) {
442 memcpy(dst, pat, 3);
443 dst += 3;
444 }
445 break;
446 case 4:
447 while (samples--) {
448 memcpy(dst, pat, 4);
449 dst += 4;
450 }
451 break;
452 case 8:
453 while (samples--) {
454 memcpy(dst, pat, 8);
455 dst += 8;
456 }
457 break;
458 }
459#endif
460 return 0;
461}
462
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200463EXPORT_SYMBOL(snd_pcm_format_set_silence);
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465/**
466 * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
467 * @runtime: the runtime instance
468 *
469 * Determines the rate_min and rate_max fields from the rates bits of
470 * the given runtime->hw.
471 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100472 * Return: Zero if successful.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100474int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 int i;
Clemens Ladisch7653d552007-08-13 17:38:54 +0200477 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 if (runtime->hw.rates & (1 << i)) {
Clemens Ladisch7653d552007-08-13 17:38:54 +0200479 runtime->hw.rate_min = snd_pcm_known_rates.list[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 break;
481 }
482 }
Clemens Ladisch7653d552007-08-13 17:38:54 +0200483 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (runtime->hw.rates & (1 << i)) {
Clemens Ladisch7653d552007-08-13 17:38:54 +0200485 runtime->hw.rate_max = snd_pcm_known_rates.list[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 break;
487 }
488 }
489 return 0;
490}
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200491
492EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
Clemens Ladisch918f3a02007-08-13 17:40:54 +0200493
494/**
495 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
496 * @rate: the sample rate to convert
497 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100498 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
Clemens Ladisch918f3a02007-08-13 17:40:54 +0200499 * SNDRV_PCM_RATE_KNOT for an unknown rate.
500 */
501unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
502{
503 unsigned int i;
504
505 for (i = 0; i < snd_pcm_known_rates.count; i++)
506 if (snd_pcm_known_rates.list[i] == rate)
507 return 1u << i;
508 return SNDRV_PCM_RATE_KNOT;
509}
510EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
Dimitris Papastamos4be77a52012-06-15 16:35:28 +0100511
512/**
513 * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
514 * @rate_bit: the rate bit to convert
515 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100516 * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
517 * or 0 for an unknown rate bit.
Dimitris Papastamos4be77a52012-06-15 16:35:28 +0100518 */
519unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
520{
521 unsigned int i;
522
523 for (i = 0; i < snd_pcm_known_rates.count; i++)
524 if ((1u << i) == rate_bit)
525 return snd_pcm_known_rates.list[i];
526 return 0;
527}
528EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
Lars-Peter Clausene3a92692014-01-11 10:24:43 +0100529
530static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
531{
532 if (rates & SNDRV_PCM_RATE_CONTINUOUS)
533 return SNDRV_PCM_RATE_CONTINUOUS;
534 else if (rates & SNDRV_PCM_RATE_KNOT)
535 return SNDRV_PCM_RATE_KNOT;
536 return rates;
537}
538
539/**
540 * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
541 * @rates_a: The first rate mask
542 * @rates_b: The second rate mask
543 *
544 * This function computes the rates that are supported by both rate masks passed
545 * to the function. It will take care of the special handling of
546 * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
547 *
548 * Return: A rate mask containing the rates that are supported by both rates_a
549 * and rates_b.
550 */
551unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
552 unsigned int rates_b)
553{
554 rates_a = snd_pcm_rate_mask_sanitize(rates_a);
555 rates_b = snd_pcm_rate_mask_sanitize(rates_b);
556
557 if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
558 return rates_b;
559 else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
560 return rates_a;
561 else if (rates_a & SNDRV_PCM_RATE_KNOT)
562 return rates_b;
563 else if (rates_b & SNDRV_PCM_RATE_KNOT)
564 return rates_a;
565 return rates_a & rates_b;
566}
567EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);