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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>
Takashi Sakamoto2c4842d2017-05-26 09:30:46 +090026
27#include "pcm_local.h"
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#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
Clemens Ladischfea952e2011-02-14 11:00:47 +010042/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
43#define INT __force int
44
45static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 [SNDRV_PCM_FORMAT_S8] = {
47 .width = 8, .phys = 8, .le = -1, .signd = 1,
48 .silence = {},
49 },
50 [SNDRV_PCM_FORMAT_U8] = {
51 .width = 8, .phys = 8, .le = -1, .signd = 0,
52 .silence = { 0x80 },
53 },
54 [SNDRV_PCM_FORMAT_S16_LE] = {
55 .width = 16, .phys = 16, .le = 1, .signd = 1,
56 .silence = {},
57 },
58 [SNDRV_PCM_FORMAT_S16_BE] = {
59 .width = 16, .phys = 16, .le = 0, .signd = 1,
60 .silence = {},
61 },
62 [SNDRV_PCM_FORMAT_U16_LE] = {
63 .width = 16, .phys = 16, .le = 1, .signd = 0,
64 .silence = { 0x00, 0x80 },
65 },
66 [SNDRV_PCM_FORMAT_U16_BE] = {
67 .width = 16, .phys = 16, .le = 0, .signd = 0,
68 .silence = { 0x80, 0x00 },
69 },
70 [SNDRV_PCM_FORMAT_S24_LE] = {
71 .width = 24, .phys = 32, .le = 1, .signd = 1,
72 .silence = {},
73 },
74 [SNDRV_PCM_FORMAT_S24_BE] = {
75 .width = 24, .phys = 32, .le = 0, .signd = 1,
76 .silence = {},
77 },
78 [SNDRV_PCM_FORMAT_U24_LE] = {
79 .width = 24, .phys = 32, .le = 1, .signd = 0,
80 .silence = { 0x00, 0x00, 0x80 },
81 },
82 [SNDRV_PCM_FORMAT_U24_BE] = {
83 .width = 24, .phys = 32, .le = 0, .signd = 0,
Jaroslav Kysela67a7be72007-12-13 10:36:03 +010084 .silence = { 0x00, 0x80, 0x00, 0x00 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 },
86 [SNDRV_PCM_FORMAT_S32_LE] = {
87 .width = 32, .phys = 32, .le = 1, .signd = 1,
88 .silence = {},
89 },
90 [SNDRV_PCM_FORMAT_S32_BE] = {
91 .width = 32, .phys = 32, .le = 0, .signd = 1,
92 .silence = {},
93 },
94 [SNDRV_PCM_FORMAT_U32_LE] = {
95 .width = 32, .phys = 32, .le = 1, .signd = 0,
96 .silence = { 0x00, 0x00, 0x00, 0x80 },
97 },
98 [SNDRV_PCM_FORMAT_U32_BE] = {
99 .width = 32, .phys = 32, .le = 0, .signd = 0,
100 .silence = { 0x80, 0x00, 0x00, 0x00 },
101 },
102 [SNDRV_PCM_FORMAT_FLOAT_LE] = {
103 .width = 32, .phys = 32, .le = 1, .signd = -1,
104 .silence = {},
105 },
106 [SNDRV_PCM_FORMAT_FLOAT_BE] = {
107 .width = 32, .phys = 32, .le = 0, .signd = -1,
108 .silence = {},
109 },
110 [SNDRV_PCM_FORMAT_FLOAT64_LE] = {
111 .width = 64, .phys = 64, .le = 1, .signd = -1,
112 .silence = {},
113 },
114 [SNDRV_PCM_FORMAT_FLOAT64_BE] = {
115 .width = 64, .phys = 64, .le = 0, .signd = -1,
116 .silence = {},
117 },
118 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
119 .width = 32, .phys = 32, .le = 1, .signd = -1,
120 .silence = {},
121 },
122 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
123 .width = 32, .phys = 32, .le = 0, .signd = -1,
124 .silence = {},
125 },
126 [SNDRV_PCM_FORMAT_MU_LAW] = {
127 .width = 8, .phys = 8, .le = -1, .signd = -1,
128 .silence = { 0x7f },
129 },
130 [SNDRV_PCM_FORMAT_A_LAW] = {
131 .width = 8, .phys = 8, .le = -1, .signd = -1,
132 .silence = { 0x55 },
133 },
134 [SNDRV_PCM_FORMAT_IMA_ADPCM] = {
135 .width = 4, .phys = 4, .le = -1, .signd = -1,
136 .silence = {},
137 },
Ben Collins15c0cee62010-05-28 11:43:45 -0400138 [SNDRV_PCM_FORMAT_G723_24] = {
139 .width = 3, .phys = 3, .le = -1, .signd = -1,
140 .silence = {},
141 },
142 [SNDRV_PCM_FORMAT_G723_40] = {
143 .width = 5, .phys = 5, .le = -1, .signd = -1,
144 .silence = {},
145 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800146 [SNDRV_PCM_FORMAT_DSD_U8] = {
147 .width = 8, .phys = 8, .le = 1, .signd = 0,
Takashi Iwai94a988a2014-08-22 11:18:48 +0200148 .silence = { 0x69 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800149 },
150 [SNDRV_PCM_FORMAT_DSD_U16_LE] = {
151 .width = 16, .phys = 16, .le = 1, .signd = 0,
Takashi Iwai94a988a2014-08-22 11:18:48 +0200152 .silence = { 0x69, 0x69 },
Daniel Mackef7a4f92013-04-17 00:01:36 +0800153 },
Jurgen Kramerd4288d32014-09-05 10:47:56 +0200154 [SNDRV_PCM_FORMAT_DSD_U32_LE] = {
155 .width = 32, .phys = 32, .le = 1, .signd = 0,
156 .silence = { 0x69, 0x69, 0x69, 0x69 },
157 },
Jussi Laakod42472e2014-11-21 16:04:46 +0200158 [SNDRV_PCM_FORMAT_DSD_U16_BE] = {
159 .width = 16, .phys = 16, .le = 0, .signd = 0,
160 .silence = { 0x69, 0x69 },
161 },
162 [SNDRV_PCM_FORMAT_DSD_U32_BE] = {
163 .width = 32, .phys = 32, .le = 0, .signd = 0,
164 .silence = { 0x69, 0x69, 0x69, 0x69 },
165 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 /* FIXME: the following three formats are not defined properly yet */
167 [SNDRV_PCM_FORMAT_MPEG] = {
168 .le = -1, .signd = -1,
169 },
170 [SNDRV_PCM_FORMAT_GSM] = {
171 .le = -1, .signd = -1,
172 },
173 [SNDRV_PCM_FORMAT_SPECIAL] = {
174 .le = -1, .signd = -1,
175 },
176 [SNDRV_PCM_FORMAT_S24_3LE] = {
177 .width = 24, .phys = 24, .le = 1, .signd = 1,
178 .silence = {},
179 },
180 [SNDRV_PCM_FORMAT_S24_3BE] = {
181 .width = 24, .phys = 24, .le = 0, .signd = 1,
182 .silence = {},
183 },
184 [SNDRV_PCM_FORMAT_U24_3LE] = {
185 .width = 24, .phys = 24, .le = 1, .signd = 0,
186 .silence = { 0x00, 0x00, 0x80 },
187 },
188 [SNDRV_PCM_FORMAT_U24_3BE] = {
189 .width = 24, .phys = 24, .le = 0, .signd = 0,
190 .silence = { 0x80, 0x00, 0x00 },
191 },
192 [SNDRV_PCM_FORMAT_S20_3LE] = {
193 .width = 20, .phys = 24, .le = 1, .signd = 1,
194 .silence = {},
195 },
196 [SNDRV_PCM_FORMAT_S20_3BE] = {
197 .width = 20, .phys = 24, .le = 0, .signd = 1,
198 .silence = {},
199 },
200 [SNDRV_PCM_FORMAT_U20_3LE] = {
201 .width = 20, .phys = 24, .le = 1, .signd = 0,
202 .silence = { 0x00, 0x00, 0x08 },
203 },
204 [SNDRV_PCM_FORMAT_U20_3BE] = {
205 .width = 20, .phys = 24, .le = 0, .signd = 0,
206 .silence = { 0x08, 0x00, 0x00 },
207 },
208 [SNDRV_PCM_FORMAT_S18_3LE] = {
209 .width = 18, .phys = 24, .le = 1, .signd = 1,
210 .silence = {},
211 },
212 [SNDRV_PCM_FORMAT_S18_3BE] = {
213 .width = 18, .phys = 24, .le = 0, .signd = 1,
214 .silence = {},
215 },
216 [SNDRV_PCM_FORMAT_U18_3LE] = {
217 .width = 18, .phys = 24, .le = 1, .signd = 0,
218 .silence = { 0x00, 0x00, 0x02 },
219 },
220 [SNDRV_PCM_FORMAT_U18_3BE] = {
221 .width = 18, .phys = 24, .le = 0, .signd = 0,
222 .silence = { 0x02, 0x00, 0x00 },
223 },
Ben Collins15c0cee62010-05-28 11:43:45 -0400224 [SNDRV_PCM_FORMAT_G723_24_1B] = {
225 .width = 3, .phys = 8, .le = -1, .signd = -1,
226 .silence = {},
227 },
228 [SNDRV_PCM_FORMAT_G723_40_1B] = {
229 .width = 5, .phys = 8, .le = -1, .signd = -1,
230 .silence = {},
231 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232};
233
234
235/**
236 * snd_pcm_format_signed - Check the PCM format is signed linear
237 * @format: the format to check
238 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100239 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 * linear, and a negative error code for non-linear formats.
241 */
242int snd_pcm_format_signed(snd_pcm_format_t format)
243{
244 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100245 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100247 if ((val = pcm_formats[(INT)format].signd) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 return -EINVAL;
249 return val;
250}
251
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200252EXPORT_SYMBOL(snd_pcm_format_signed);
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/**
255 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
256 * @format: the format to check
257 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100258 * Return: 1 if the given PCM format is unsigned linear, 0 if signed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 * linear, and a negative error code for non-linear formats.
260 */
261int snd_pcm_format_unsigned(snd_pcm_format_t format)
262{
263 int val;
264
265 val = snd_pcm_format_signed(format);
266 if (val < 0)
267 return val;
268 return !val;
269}
270
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200271EXPORT_SYMBOL(snd_pcm_format_unsigned);
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273/**
274 * snd_pcm_format_linear - Check the PCM format is linear
275 * @format: the format to check
276 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100277 * Return: 1 if the given PCM format is linear, 0 if not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 */
279int snd_pcm_format_linear(snd_pcm_format_t format)
280{
281 return snd_pcm_format_signed(format) >= 0;
282}
283
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200284EXPORT_SYMBOL(snd_pcm_format_linear);
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286/**
287 * snd_pcm_format_little_endian - Check the PCM format is little-endian
288 * @format: the format to check
289 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100290 * Return: 1 if the given PCM format is little-endian, 0 if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 * big-endian, or a negative error code if endian not specified.
292 */
293int snd_pcm_format_little_endian(snd_pcm_format_t format)
294{
295 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100296 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100298 if ((val = pcm_formats[(INT)format].le) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return -EINVAL;
300 return val;
301}
302
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200303EXPORT_SYMBOL(snd_pcm_format_little_endian);
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/**
306 * snd_pcm_format_big_endian - Check the PCM format is big-endian
307 * @format: the format to check
308 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100309 * Return: 1 if the given PCM format is big-endian, 0 if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 * little-endian, or a negative error code if endian not specified.
311 */
312int snd_pcm_format_big_endian(snd_pcm_format_t format)
313{
314 int val;
315
316 val = snd_pcm_format_little_endian(format);
317 if (val < 0)
318 return val;
319 return !val;
320}
321
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200322EXPORT_SYMBOL(snd_pcm_format_big_endian);
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 * snd_pcm_format_width - return the bit-width of the format
326 * @format: the format to check
327 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100328 * Return: The bit-width of the format, or a negative error code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 * if unknown format.
330 */
331int snd_pcm_format_width(snd_pcm_format_t format)
332{
333 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100334 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100336 if ((val = pcm_formats[(INT)format].width) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return -EINVAL;
338 return val;
339}
340
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200341EXPORT_SYMBOL(snd_pcm_format_width);
342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343/**
344 * snd_pcm_format_physical_width - return the physical bit-width of the format
345 * @format: the format to check
346 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100347 * Return: The physical bit-width of the format, or a negative error code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 * if unknown format.
349 */
350int snd_pcm_format_physical_width(snd_pcm_format_t format)
351{
352 int val;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100353 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return -EINVAL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100355 if ((val = pcm_formats[(INT)format].phys) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return -EINVAL;
357 return val;
358}
359
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200360EXPORT_SYMBOL(snd_pcm_format_physical_width);
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362/**
363 * snd_pcm_format_size - return the byte size of samples on the given format
364 * @format: the format to check
Randy Dunlapa66547f2008-10-17 11:28:11 -0700365 * @samples: sampling rate
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100367 * Return: The byte size of the given samples for the format, or a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 * negative error code if unknown format.
369 */
370ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
371{
372 int phys_width = snd_pcm_format_physical_width(format);
373 if (phys_width < 0)
374 return -EINVAL;
375 return samples * phys_width / 8;
376}
377
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200378EXPORT_SYMBOL(snd_pcm_format_size);
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380/**
381 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
382 * @format: the format to check
383 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100384 * Return: The format pattern to fill or %NULL if error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 */
386const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
387{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100388 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return NULL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100390 if (! pcm_formats[(INT)format].phys)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return NULL;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100392 return pcm_formats[(INT)format].silence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}
394
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200395EXPORT_SYMBOL(snd_pcm_format_silence_64);
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397/**
398 * snd_pcm_format_set_silence - set the silence data on the buffer
399 * @format: the PCM format
400 * @data: the buffer pointer
401 * @samples: the number of samples to set silence
402 *
403 * Sets the silence data on the buffer for the given samples.
404 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100405 * Return: Zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 */
407int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
408{
409 int width;
410 unsigned char *dst, *pat;
411
Clemens Ladischfea952e2011-02-14 11:00:47 +0100412 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return -EINVAL;
414 if (samples == 0)
415 return 0;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100416 width = pcm_formats[(INT)format].phys; /* physical width */
417 pat = pcm_formats[(INT)format].silence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 if (! width)
419 return -EINVAL;
420 /* signed or 1 byte data */
Clemens Ladischfea952e2011-02-14 11:00:47 +0100421 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 unsigned int bytes = samples * width / 8;
423 memset(data, *pat, bytes);
424 return 0;
425 }
426 /* non-zero samples, fill using a loop */
427 width /= 8;
428 dst = data;
429#if 0
430 while (samples--) {
431 memcpy(dst, pat, width);
432 dst += width;
433 }
434#else
435 /* a bit optimization for constant width */
436 switch (width) {
437 case 2:
438 while (samples--) {
439 memcpy(dst, pat, 2);
440 dst += 2;
441 }
442 break;
443 case 3:
444 while (samples--) {
445 memcpy(dst, pat, 3);
446 dst += 3;
447 }
448 break;
449 case 4:
450 while (samples--) {
451 memcpy(dst, pat, 4);
452 dst += 4;
453 }
454 break;
455 case 8:
456 while (samples--) {
457 memcpy(dst, pat, 8);
458 dst += 8;
459 }
460 break;
461 }
462#endif
463 return 0;
464}
465
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200466EXPORT_SYMBOL(snd_pcm_format_set_silence);
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468/**
469 * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
470 * @runtime: the runtime instance
471 *
472 * Determines the rate_min and rate_max fields from the rates bits of
473 * the given runtime->hw.
474 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100475 * Return: Zero if successful.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100477int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 int i;
Clemens Ladisch7653d552007-08-13 17:38:54 +0200480 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (runtime->hw.rates & (1 << i)) {
Clemens Ladisch7653d552007-08-13 17:38:54 +0200482 runtime->hw.rate_min = snd_pcm_known_rates.list[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 break;
484 }
485 }
Clemens Ladisch7653d552007-08-13 17:38:54 +0200486 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (runtime->hw.rates & (1 << i)) {
Clemens Ladisch7653d552007-08-13 17:38:54 +0200488 runtime->hw.rate_max = snd_pcm_known_rates.list[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 break;
490 }
491 }
492 return 0;
493}
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200494
495EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
Clemens Ladisch918f3a02007-08-13 17:40:54 +0200496
497/**
498 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
499 * @rate: the sample rate to convert
500 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100501 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
Clemens Ladisch918f3a02007-08-13 17:40:54 +0200502 * SNDRV_PCM_RATE_KNOT for an unknown rate.
503 */
504unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
505{
506 unsigned int i;
507
508 for (i = 0; i < snd_pcm_known_rates.count; i++)
509 if (snd_pcm_known_rates.list[i] == rate)
510 return 1u << i;
511 return SNDRV_PCM_RATE_KNOT;
512}
513EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
Dimitris Papastamos4be77a52012-06-15 16:35:28 +0100514
515/**
516 * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
517 * @rate_bit: the rate bit to convert
518 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100519 * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
520 * or 0 for an unknown rate bit.
Dimitris Papastamos4be77a52012-06-15 16:35:28 +0100521 */
522unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
523{
524 unsigned int i;
525
526 for (i = 0; i < snd_pcm_known_rates.count; i++)
527 if ((1u << i) == rate_bit)
528 return snd_pcm_known_rates.list[i];
529 return 0;
530}
531EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
Lars-Peter Clausene3a92692014-01-11 10:24:43 +0100532
533static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
534{
535 if (rates & SNDRV_PCM_RATE_CONTINUOUS)
536 return SNDRV_PCM_RATE_CONTINUOUS;
537 else if (rates & SNDRV_PCM_RATE_KNOT)
538 return SNDRV_PCM_RATE_KNOT;
539 return rates;
540}
541
542/**
543 * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
544 * @rates_a: The first rate mask
545 * @rates_b: The second rate mask
546 *
547 * This function computes the rates that are supported by both rate masks passed
548 * to the function. It will take care of the special handling of
549 * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
550 *
551 * Return: A rate mask containing the rates that are supported by both rates_a
552 * and rates_b.
553 */
554unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
555 unsigned int rates_b)
556{
557 rates_a = snd_pcm_rate_mask_sanitize(rates_a);
558 rates_b = snd_pcm_rate_mask_sanitize(rates_b);
559
560 if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
561 return rates_b;
562 else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
563 return rates_a;
564 else if (rates_a & SNDRV_PCM_RATE_KNOT)
565 return rates_b;
566 else if (rates_b & SNDRV_PCM_RATE_KNOT)
567 return rates_a;
568 return rates_a & rates_b;
569}
570EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
Mengdong Lin3bdff242016-01-15 16:13:10 +0800571
572/**
573 * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit
574 * @rate_min: the minimum sample rate
575 * @rate_max: the maximum sample rate
576 *
577 * This function has an implicit assumption: the rates in the given range have
578 * only the pre-defined rates like 44100 or 16000.
579 *
580 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range,
581 * or SNDRV_PCM_RATE_KNOT for an unknown range.
582 */
583unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
584 unsigned int rate_max)
585{
586 unsigned int rates = 0;
587 int i;
588
589 for (i = 0; i < snd_pcm_known_rates.count; i++) {
590 if (snd_pcm_known_rates.list[i] >= rate_min
591 && snd_pcm_known_rates.list[i] <= rate_max)
592 rates |= 1 << i;
593 }
594
595 if (!rates)
596 rates = SNDRV_PCM_RATE_KNOT;
597
598 return rates;
599}
600EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);