Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PCM Interface - misc routines | |
c1017a4c | 3 | * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 | 22 | #include <linux/time.h> |
d81a6d71 | 23 | #include <linux/export.h> |
1da177e4 LT |
24 | #include <sound/core.h> |
25 | #include <sound/pcm.h> | |
2c4842d3 TS |
26 | |
27 | #include "pcm_local.h" | |
28 | ||
1da177e4 LT |
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 | */ | |
34 | struct 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 | ||
fea952e5 CL |
42 | /* we do lots of calculations on snd_pcm_format_t; shut up sparse */ |
43 | #define INT __force int | |
44 | ||
45 | static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = { | |
1da177e4 LT |
46 | [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, | |
67a7be7e | 84 | .silence = { 0x00, 0x80, 0x00, 0x00 }, |
1da177e4 LT |
85 | }, |
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 | }, | |
15c0cee6 BC |
138 | [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 | }, | |
ef7a4f97 DM |
146 | [SNDRV_PCM_FORMAT_DSD_U8] = { |
147 | .width = 8, .phys = 8, .le = 1, .signd = 0, | |
94a988a8 | 148 | .silence = { 0x69 }, |
ef7a4f97 DM |
149 | }, |
150 | [SNDRV_PCM_FORMAT_DSD_U16_LE] = { | |
151 | .width = 16, .phys = 16, .le = 1, .signd = 0, | |
94a988a8 | 152 | .silence = { 0x69, 0x69 }, |
ef7a4f97 | 153 | }, |
d4288d3f JK |
154 | [SNDRV_PCM_FORMAT_DSD_U32_LE] = { |
155 | .width = 32, .phys = 32, .le = 1, .signd = 0, | |
156 | .silence = { 0x69, 0x69, 0x69, 0x69 }, | |
157 | }, | |
d42472ec JL |
158 | [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 | }, | |
823dbb6e | 166 | /* FIXME: the following two formats are not defined properly yet */ |
1da177e4 LT |
167 | [SNDRV_PCM_FORMAT_MPEG] = { |
168 | .le = -1, .signd = -1, | |
169 | }, | |
170 | [SNDRV_PCM_FORMAT_GSM] = { | |
171 | .le = -1, .signd = -1, | |
172 | }, | |
823dbb6e MS |
173 | [SNDRV_PCM_FORMAT_S20_LE] = { |
174 | .width = 20, .phys = 32, .le = 1, .signd = 1, | |
175 | .silence = {}, | |
176 | }, | |
177 | [SNDRV_PCM_FORMAT_S20_BE] = { | |
178 | .width = 20, .phys = 32, .le = 0, .signd = 1, | |
179 | .silence = {}, | |
180 | }, | |
181 | [SNDRV_PCM_FORMAT_U20_LE] = { | |
182 | .width = 20, .phys = 32, .le = 1, .signd = 0, | |
183 | .silence = { 0x00, 0x00, 0x08, 0x00 }, | |
184 | }, | |
185 | [SNDRV_PCM_FORMAT_U20_BE] = { | |
186 | .width = 20, .phys = 32, .le = 0, .signd = 0, | |
187 | .silence = { 0x00, 0x08, 0x00, 0x00 }, | |
188 | }, | |
189 | /* FIXME: the following format is not defined properly yet */ | |
1da177e4 LT |
190 | [SNDRV_PCM_FORMAT_SPECIAL] = { |
191 | .le = -1, .signd = -1, | |
192 | }, | |
193 | [SNDRV_PCM_FORMAT_S24_3LE] = { | |
194 | .width = 24, .phys = 24, .le = 1, .signd = 1, | |
195 | .silence = {}, | |
196 | }, | |
197 | [SNDRV_PCM_FORMAT_S24_3BE] = { | |
198 | .width = 24, .phys = 24, .le = 0, .signd = 1, | |
199 | .silence = {}, | |
200 | }, | |
201 | [SNDRV_PCM_FORMAT_U24_3LE] = { | |
202 | .width = 24, .phys = 24, .le = 1, .signd = 0, | |
203 | .silence = { 0x00, 0x00, 0x80 }, | |
204 | }, | |
205 | [SNDRV_PCM_FORMAT_U24_3BE] = { | |
206 | .width = 24, .phys = 24, .le = 0, .signd = 0, | |
207 | .silence = { 0x80, 0x00, 0x00 }, | |
208 | }, | |
209 | [SNDRV_PCM_FORMAT_S20_3LE] = { | |
210 | .width = 20, .phys = 24, .le = 1, .signd = 1, | |
211 | .silence = {}, | |
212 | }, | |
213 | [SNDRV_PCM_FORMAT_S20_3BE] = { | |
214 | .width = 20, .phys = 24, .le = 0, .signd = 1, | |
215 | .silence = {}, | |
216 | }, | |
217 | [SNDRV_PCM_FORMAT_U20_3LE] = { | |
218 | .width = 20, .phys = 24, .le = 1, .signd = 0, | |
219 | .silence = { 0x00, 0x00, 0x08 }, | |
220 | }, | |
221 | [SNDRV_PCM_FORMAT_U20_3BE] = { | |
222 | .width = 20, .phys = 24, .le = 0, .signd = 0, | |
223 | .silence = { 0x08, 0x00, 0x00 }, | |
224 | }, | |
225 | [SNDRV_PCM_FORMAT_S18_3LE] = { | |
226 | .width = 18, .phys = 24, .le = 1, .signd = 1, | |
227 | .silence = {}, | |
228 | }, | |
229 | [SNDRV_PCM_FORMAT_S18_3BE] = { | |
230 | .width = 18, .phys = 24, .le = 0, .signd = 1, | |
231 | .silence = {}, | |
232 | }, | |
233 | [SNDRV_PCM_FORMAT_U18_3LE] = { | |
234 | .width = 18, .phys = 24, .le = 1, .signd = 0, | |
235 | .silence = { 0x00, 0x00, 0x02 }, | |
236 | }, | |
237 | [SNDRV_PCM_FORMAT_U18_3BE] = { | |
238 | .width = 18, .phys = 24, .le = 0, .signd = 0, | |
239 | .silence = { 0x02, 0x00, 0x00 }, | |
240 | }, | |
15c0cee6 BC |
241 | [SNDRV_PCM_FORMAT_G723_24_1B] = { |
242 | .width = 3, .phys = 8, .le = -1, .signd = -1, | |
243 | .silence = {}, | |
244 | }, | |
245 | [SNDRV_PCM_FORMAT_G723_40_1B] = { | |
246 | .width = 5, .phys = 8, .le = -1, .signd = -1, | |
247 | .silence = {}, | |
248 | }, | |
1da177e4 LT |
249 | }; |
250 | ||
251 | ||
252 | /** | |
253 | * snd_pcm_format_signed - Check the PCM format is signed linear | |
254 | * @format: the format to check | |
255 | * | |
eb7c06e8 | 256 | * Return: 1 if the given PCM format is signed linear, 0 if unsigned |
1da177e4 LT |
257 | * linear, and a negative error code for non-linear formats. |
258 | */ | |
259 | int snd_pcm_format_signed(snd_pcm_format_t format) | |
260 | { | |
261 | int val; | |
fea952e5 | 262 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 | 263 | return -EINVAL; |
fea952e5 | 264 | if ((val = pcm_formats[(INT)format].signd) < 0) |
1da177e4 LT |
265 | return -EINVAL; |
266 | return val; | |
267 | } | |
e88e8ae6 TI |
268 | EXPORT_SYMBOL(snd_pcm_format_signed); |
269 | ||
1da177e4 LT |
270 | /** |
271 | * snd_pcm_format_unsigned - Check the PCM format is unsigned linear | |
272 | * @format: the format to check | |
273 | * | |
eb7c06e8 | 274 | * Return: 1 if the given PCM format is unsigned linear, 0 if signed |
1da177e4 LT |
275 | * linear, and a negative error code for non-linear formats. |
276 | */ | |
277 | int snd_pcm_format_unsigned(snd_pcm_format_t format) | |
278 | { | |
279 | int val; | |
280 | ||
281 | val = snd_pcm_format_signed(format); | |
282 | if (val < 0) | |
283 | return val; | |
284 | return !val; | |
285 | } | |
e88e8ae6 TI |
286 | EXPORT_SYMBOL(snd_pcm_format_unsigned); |
287 | ||
1da177e4 LT |
288 | /** |
289 | * snd_pcm_format_linear - Check the PCM format is linear | |
290 | * @format: the format to check | |
291 | * | |
eb7c06e8 | 292 | * Return: 1 if the given PCM format is linear, 0 if not. |
1da177e4 LT |
293 | */ |
294 | int snd_pcm_format_linear(snd_pcm_format_t format) | |
295 | { | |
296 | return snd_pcm_format_signed(format) >= 0; | |
297 | } | |
e88e8ae6 TI |
298 | EXPORT_SYMBOL(snd_pcm_format_linear); |
299 | ||
1da177e4 LT |
300 | /** |
301 | * snd_pcm_format_little_endian - Check the PCM format is little-endian | |
302 | * @format: the format to check | |
303 | * | |
eb7c06e8 | 304 | * Return: 1 if the given PCM format is little-endian, 0 if |
1da177e4 LT |
305 | * big-endian, or a negative error code if endian not specified. |
306 | */ | |
307 | int snd_pcm_format_little_endian(snd_pcm_format_t format) | |
308 | { | |
309 | int val; | |
fea952e5 | 310 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 | 311 | return -EINVAL; |
fea952e5 | 312 | if ((val = pcm_formats[(INT)format].le) < 0) |
1da177e4 LT |
313 | return -EINVAL; |
314 | return val; | |
315 | } | |
e88e8ae6 TI |
316 | EXPORT_SYMBOL(snd_pcm_format_little_endian); |
317 | ||
1da177e4 LT |
318 | /** |
319 | * snd_pcm_format_big_endian - Check the PCM format is big-endian | |
320 | * @format: the format to check | |
321 | * | |
eb7c06e8 | 322 | * Return: 1 if the given PCM format is big-endian, 0 if |
1da177e4 LT |
323 | * little-endian, or a negative error code if endian not specified. |
324 | */ | |
325 | int snd_pcm_format_big_endian(snd_pcm_format_t format) | |
326 | { | |
327 | int val; | |
328 | ||
329 | val = snd_pcm_format_little_endian(format); | |
330 | if (val < 0) | |
331 | return val; | |
332 | return !val; | |
333 | } | |
e88e8ae6 TI |
334 | EXPORT_SYMBOL(snd_pcm_format_big_endian); |
335 | ||
1da177e4 LT |
336 | /** |
337 | * snd_pcm_format_width - return the bit-width of the format | |
338 | * @format: the format to check | |
339 | * | |
eb7c06e8 | 340 | * Return: The bit-width of the format, or a negative error code |
1da177e4 LT |
341 | * if unknown format. |
342 | */ | |
343 | int snd_pcm_format_width(snd_pcm_format_t format) | |
344 | { | |
345 | int val; | |
fea952e5 | 346 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 | 347 | return -EINVAL; |
fea952e5 | 348 | if ((val = pcm_formats[(INT)format].width) == 0) |
1da177e4 LT |
349 | return -EINVAL; |
350 | return val; | |
351 | } | |
e88e8ae6 TI |
352 | EXPORT_SYMBOL(snd_pcm_format_width); |
353 | ||
1da177e4 LT |
354 | /** |
355 | * snd_pcm_format_physical_width - return the physical bit-width of the format | |
356 | * @format: the format to check | |
357 | * | |
eb7c06e8 | 358 | * Return: The physical bit-width of the format, or a negative error code |
1da177e4 LT |
359 | * if unknown format. |
360 | */ | |
361 | int snd_pcm_format_physical_width(snd_pcm_format_t format) | |
362 | { | |
363 | int val; | |
fea952e5 | 364 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 | 365 | return -EINVAL; |
fea952e5 | 366 | if ((val = pcm_formats[(INT)format].phys) == 0) |
1da177e4 LT |
367 | return -EINVAL; |
368 | return val; | |
369 | } | |
e88e8ae6 TI |
370 | EXPORT_SYMBOL(snd_pcm_format_physical_width); |
371 | ||
1da177e4 LT |
372 | /** |
373 | * snd_pcm_format_size - return the byte size of samples on the given format | |
374 | * @format: the format to check | |
a66547f3 | 375 | * @samples: sampling rate |
1da177e4 | 376 | * |
eb7c06e8 | 377 | * Return: The byte size of the given samples for the format, or a |
1da177e4 LT |
378 | * negative error code if unknown format. |
379 | */ | |
380 | ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples) | |
381 | { | |
382 | int phys_width = snd_pcm_format_physical_width(format); | |
383 | if (phys_width < 0) | |
384 | return -EINVAL; | |
385 | return samples * phys_width / 8; | |
386 | } | |
e88e8ae6 TI |
387 | EXPORT_SYMBOL(snd_pcm_format_size); |
388 | ||
1da177e4 LT |
389 | /** |
390 | * snd_pcm_format_silence_64 - return the silent data in 8 bytes array | |
391 | * @format: the format to check | |
392 | * | |
eb7c06e8 | 393 | * Return: The format pattern to fill or %NULL if error. |
1da177e4 LT |
394 | */ |
395 | const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format) | |
396 | { | |
fea952e5 | 397 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 | 398 | return NULL; |
fea952e5 | 399 | if (! pcm_formats[(INT)format].phys) |
1da177e4 | 400 | return NULL; |
fea952e5 | 401 | return pcm_formats[(INT)format].silence; |
1da177e4 | 402 | } |
e88e8ae6 TI |
403 | EXPORT_SYMBOL(snd_pcm_format_silence_64); |
404 | ||
1da177e4 LT |
405 | /** |
406 | * snd_pcm_format_set_silence - set the silence data on the buffer | |
407 | * @format: the PCM format | |
408 | * @data: the buffer pointer | |
409 | * @samples: the number of samples to set silence | |
410 | * | |
411 | * Sets the silence data on the buffer for the given samples. | |
412 | * | |
eb7c06e8 | 413 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 LT |
414 | */ |
415 | int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) | |
416 | { | |
417 | int width; | |
418 | unsigned char *dst, *pat; | |
419 | ||
fea952e5 | 420 | if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) |
1da177e4 LT |
421 | return -EINVAL; |
422 | if (samples == 0) | |
423 | return 0; | |
fea952e5 CL |
424 | width = pcm_formats[(INT)format].phys; /* physical width */ |
425 | pat = pcm_formats[(INT)format].silence; | |
1da177e4 LT |
426 | if (! width) |
427 | return -EINVAL; | |
428 | /* signed or 1 byte data */ | |
fea952e5 | 429 | if (pcm_formats[(INT)format].signd == 1 || width <= 8) { |
1da177e4 LT |
430 | unsigned int bytes = samples * width / 8; |
431 | memset(data, *pat, bytes); | |
432 | return 0; | |
433 | } | |
434 | /* non-zero samples, fill using a loop */ | |
435 | width /= 8; | |
436 | dst = data; | |
437 | #if 0 | |
438 | while (samples--) { | |
439 | memcpy(dst, pat, width); | |
440 | dst += width; | |
441 | } | |
442 | #else | |
443 | /* a bit optimization for constant width */ | |
444 | switch (width) { | |
445 | case 2: | |
446 | while (samples--) { | |
447 | memcpy(dst, pat, 2); | |
448 | dst += 2; | |
449 | } | |
450 | break; | |
451 | case 3: | |
452 | while (samples--) { | |
453 | memcpy(dst, pat, 3); | |
454 | dst += 3; | |
455 | } | |
456 | break; | |
457 | case 4: | |
458 | while (samples--) { | |
459 | memcpy(dst, pat, 4); | |
460 | dst += 4; | |
461 | } | |
462 | break; | |
463 | case 8: | |
464 | while (samples--) { | |
465 | memcpy(dst, pat, 8); | |
466 | dst += 8; | |
467 | } | |
468 | break; | |
469 | } | |
470 | #endif | |
471 | return 0; | |
472 | } | |
e88e8ae6 TI |
473 | EXPORT_SYMBOL(snd_pcm_format_set_silence); |
474 | ||
1da177e4 LT |
475 | /** |
476 | * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields | |
477 | * @runtime: the runtime instance | |
478 | * | |
479 | * Determines the rate_min and rate_max fields from the rates bits of | |
480 | * the given runtime->hw. | |
481 | * | |
eb7c06e8 | 482 | * Return: Zero if successful. |
1da177e4 | 483 | */ |
877211f5 | 484 | int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) |
1da177e4 | 485 | { |
1da177e4 | 486 | int i; |
7653d557 | 487 | for (i = 0; i < (int)snd_pcm_known_rates.count; i++) { |
1da177e4 | 488 | if (runtime->hw.rates & (1 << i)) { |
7653d557 | 489 | runtime->hw.rate_min = snd_pcm_known_rates.list[i]; |
1da177e4 LT |
490 | break; |
491 | } | |
492 | } | |
7653d557 | 493 | for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) { |
1da177e4 | 494 | if (runtime->hw.rates & (1 << i)) { |
7653d557 | 495 | runtime->hw.rate_max = snd_pcm_known_rates.list[i]; |
1da177e4 LT |
496 | break; |
497 | } | |
498 | } | |
499 | return 0; | |
500 | } | |
e88e8ae6 | 501 | EXPORT_SYMBOL(snd_pcm_limit_hw_rates); |
918f3a0e CL |
502 | |
503 | /** | |
504 | * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit | |
505 | * @rate: the sample rate to convert | |
506 | * | |
eb7c06e8 | 507 | * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or |
918f3a0e CL |
508 | * SNDRV_PCM_RATE_KNOT for an unknown rate. |
509 | */ | |
510 | unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) | |
511 | { | |
512 | unsigned int i; | |
513 | ||
514 | for (i = 0; i < snd_pcm_known_rates.count; i++) | |
515 | if (snd_pcm_known_rates.list[i] == rate) | |
516 | return 1u << i; | |
517 | return SNDRV_PCM_RATE_KNOT; | |
518 | } | |
519 | EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit); | |
4be77a53 DP |
520 | |
521 | /** | |
522 | * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate | |
523 | * @rate_bit: the rate bit to convert | |
524 | * | |
eb7c06e8 YB |
525 | * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag |
526 | * or 0 for an unknown rate bit. | |
4be77a53 DP |
527 | */ |
528 | unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit) | |
529 | { | |
530 | unsigned int i; | |
531 | ||
532 | for (i = 0; i < snd_pcm_known_rates.count; i++) | |
533 | if ((1u << i) == rate_bit) | |
534 | return snd_pcm_known_rates.list[i]; | |
535 | return 0; | |
536 | } | |
537 | EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate); | |
e3a9269f LPC |
538 | |
539 | static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates) | |
540 | { | |
541 | if (rates & SNDRV_PCM_RATE_CONTINUOUS) | |
542 | return SNDRV_PCM_RATE_CONTINUOUS; | |
543 | else if (rates & SNDRV_PCM_RATE_KNOT) | |
544 | return SNDRV_PCM_RATE_KNOT; | |
545 | return rates; | |
546 | } | |
547 | ||
548 | /** | |
549 | * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks | |
550 | * @rates_a: The first rate mask | |
551 | * @rates_b: The second rate mask | |
552 | * | |
553 | * This function computes the rates that are supported by both rate masks passed | |
554 | * to the function. It will take care of the special handling of | |
555 | * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT. | |
556 | * | |
557 | * Return: A rate mask containing the rates that are supported by both rates_a | |
558 | * and rates_b. | |
559 | */ | |
560 | unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, | |
561 | unsigned int rates_b) | |
562 | { | |
563 | rates_a = snd_pcm_rate_mask_sanitize(rates_a); | |
564 | rates_b = snd_pcm_rate_mask_sanitize(rates_b); | |
565 | ||
566 | if (rates_a & SNDRV_PCM_RATE_CONTINUOUS) | |
567 | return rates_b; | |
568 | else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS) | |
569 | return rates_a; | |
570 | else if (rates_a & SNDRV_PCM_RATE_KNOT) | |
571 | return rates_b; | |
572 | else if (rates_b & SNDRV_PCM_RATE_KNOT) | |
573 | return rates_a; | |
574 | return rates_a & rates_b; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect); | |
3bdff244 ML |
577 | |
578 | /** | |
579 | * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit | |
580 | * @rate_min: the minimum sample rate | |
581 | * @rate_max: the maximum sample rate | |
582 | * | |
583 | * This function has an implicit assumption: the rates in the given range have | |
584 | * only the pre-defined rates like 44100 or 16000. | |
585 | * | |
586 | * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range, | |
587 | * or SNDRV_PCM_RATE_KNOT for an unknown range. | |
588 | */ | |
589 | unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, | |
590 | unsigned int rate_max) | |
591 | { | |
592 | unsigned int rates = 0; | |
593 | int i; | |
594 | ||
595 | for (i = 0; i < snd_pcm_known_rates.count; i++) { | |
596 | if (snd_pcm_known_rates.list[i] >= rate_min | |
597 | && snd_pcm_known_rates.list[i] <= rate_max) | |
598 | rates |= 1 << i; | |
599 | } | |
600 | ||
601 | if (!rates) | |
602 | rates = SNDRV_PCM_RATE_KNOT; | |
603 | ||
604 | return rates; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits); |