Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groec...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / pcm_misc.c
blob9c9eff9afbac85030effbe23b1aa1b6e117912f2
1 /*
2 * PCM Interface - misc routines
3 * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
22 #include <linux/time.h>
23 #include <linux/export.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #define SND_PCM_FORMAT_UNKNOWN (-1)
28 /* NOTE: "signed" prefix must be given below since the default char is
29 * unsigned on some architectures!
31 struct 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 */
39 /* we do lots of calculations on snd_pcm_format_t; shut up sparse */
40 #define INT __force int
42 static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
43 [SNDRV_PCM_FORMAT_S8] = {
44 .width = 8, .phys = 8, .le = -1, .signd = 1,
45 .silence = {},
47 [SNDRV_PCM_FORMAT_U8] = {
48 .width = 8, .phys = 8, .le = -1, .signd = 0,
49 .silence = { 0x80 },
51 [SNDRV_PCM_FORMAT_S16_LE] = {
52 .width = 16, .phys = 16, .le = 1, .signd = 1,
53 .silence = {},
55 [SNDRV_PCM_FORMAT_S16_BE] = {
56 .width = 16, .phys = 16, .le = 0, .signd = 1,
57 .silence = {},
59 [SNDRV_PCM_FORMAT_U16_LE] = {
60 .width = 16, .phys = 16, .le = 1, .signd = 0,
61 .silence = { 0x00, 0x80 },
63 [SNDRV_PCM_FORMAT_U16_BE] = {
64 .width = 16, .phys = 16, .le = 0, .signd = 0,
65 .silence = { 0x80, 0x00 },
67 [SNDRV_PCM_FORMAT_S24_LE] = {
68 .width = 24, .phys = 32, .le = 1, .signd = 1,
69 .silence = {},
71 [SNDRV_PCM_FORMAT_S24_BE] = {
72 .width = 24, .phys = 32, .le = 0, .signd = 1,
73 .silence = {},
75 [SNDRV_PCM_FORMAT_U24_LE] = {
76 .width = 24, .phys = 32, .le = 1, .signd = 0,
77 .silence = { 0x00, 0x00, 0x80 },
79 [SNDRV_PCM_FORMAT_U24_BE] = {
80 .width = 24, .phys = 32, .le = 0, .signd = 0,
81 .silence = { 0x00, 0x80, 0x00, 0x00 },
83 [SNDRV_PCM_FORMAT_S32_LE] = {
84 .width = 32, .phys = 32, .le = 1, .signd = 1,
85 .silence = {},
87 [SNDRV_PCM_FORMAT_S32_BE] = {
88 .width = 32, .phys = 32, .le = 0, .signd = 1,
89 .silence = {},
91 [SNDRV_PCM_FORMAT_U32_LE] = {
92 .width = 32, .phys = 32, .le = 1, .signd = 0,
93 .silence = { 0x00, 0x00, 0x00, 0x80 },
95 [SNDRV_PCM_FORMAT_U32_BE] = {
96 .width = 32, .phys = 32, .le = 0, .signd = 0,
97 .silence = { 0x80, 0x00, 0x00, 0x00 },
99 [SNDRV_PCM_FORMAT_FLOAT_LE] = {
100 .width = 32, .phys = 32, .le = 1, .signd = -1,
101 .silence = {},
103 [SNDRV_PCM_FORMAT_FLOAT_BE] = {
104 .width = 32, .phys = 32, .le = 0, .signd = -1,
105 .silence = {},
107 [SNDRV_PCM_FORMAT_FLOAT64_LE] = {
108 .width = 64, .phys = 64, .le = 1, .signd = -1,
109 .silence = {},
111 [SNDRV_PCM_FORMAT_FLOAT64_BE] = {
112 .width = 64, .phys = 64, .le = 0, .signd = -1,
113 .silence = {},
115 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
116 .width = 32, .phys = 32, .le = 1, .signd = -1,
117 .silence = {},
119 [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
120 .width = 32, .phys = 32, .le = 0, .signd = -1,
121 .silence = {},
123 [SNDRV_PCM_FORMAT_MU_LAW] = {
124 .width = 8, .phys = 8, .le = -1, .signd = -1,
125 .silence = { 0x7f },
127 [SNDRV_PCM_FORMAT_A_LAW] = {
128 .width = 8, .phys = 8, .le = -1, .signd = -1,
129 .silence = { 0x55 },
131 [SNDRV_PCM_FORMAT_IMA_ADPCM] = {
132 .width = 4, .phys = 4, .le = -1, .signd = -1,
133 .silence = {},
135 [SNDRV_PCM_FORMAT_G723_24] = {
136 .width = 3, .phys = 3, .le = -1, .signd = -1,
137 .silence = {},
139 [SNDRV_PCM_FORMAT_G723_40] = {
140 .width = 5, .phys = 5, .le = -1, .signd = -1,
141 .silence = {},
143 /* FIXME: the following three formats are not defined properly yet */
144 [SNDRV_PCM_FORMAT_MPEG] = {
145 .le = -1, .signd = -1,
147 [SNDRV_PCM_FORMAT_GSM] = {
148 .le = -1, .signd = -1,
150 [SNDRV_PCM_FORMAT_SPECIAL] = {
151 .le = -1, .signd = -1,
153 [SNDRV_PCM_FORMAT_S24_3LE] = {
154 .width = 24, .phys = 24, .le = 1, .signd = 1,
155 .silence = {},
157 [SNDRV_PCM_FORMAT_S24_3BE] = {
158 .width = 24, .phys = 24, .le = 0, .signd = 1,
159 .silence = {},
161 [SNDRV_PCM_FORMAT_U24_3LE] = {
162 .width = 24, .phys = 24, .le = 1, .signd = 0,
163 .silence = { 0x00, 0x00, 0x80 },
165 [SNDRV_PCM_FORMAT_U24_3BE] = {
166 .width = 24, .phys = 24, .le = 0, .signd = 0,
167 .silence = { 0x80, 0x00, 0x00 },
169 [SNDRV_PCM_FORMAT_S20_3LE] = {
170 .width = 20, .phys = 24, .le = 1, .signd = 1,
171 .silence = {},
173 [SNDRV_PCM_FORMAT_S20_3BE] = {
174 .width = 20, .phys = 24, .le = 0, .signd = 1,
175 .silence = {},
177 [SNDRV_PCM_FORMAT_U20_3LE] = {
178 .width = 20, .phys = 24, .le = 1, .signd = 0,
179 .silence = { 0x00, 0x00, 0x08 },
181 [SNDRV_PCM_FORMAT_U20_3BE] = {
182 .width = 20, .phys = 24, .le = 0, .signd = 0,
183 .silence = { 0x08, 0x00, 0x00 },
185 [SNDRV_PCM_FORMAT_S18_3LE] = {
186 .width = 18, .phys = 24, .le = 1, .signd = 1,
187 .silence = {},
189 [SNDRV_PCM_FORMAT_S18_3BE] = {
190 .width = 18, .phys = 24, .le = 0, .signd = 1,
191 .silence = {},
193 [SNDRV_PCM_FORMAT_U18_3LE] = {
194 .width = 18, .phys = 24, .le = 1, .signd = 0,
195 .silence = { 0x00, 0x00, 0x02 },
197 [SNDRV_PCM_FORMAT_U18_3BE] = {
198 .width = 18, .phys = 24, .le = 0, .signd = 0,
199 .silence = { 0x02, 0x00, 0x00 },
201 [SNDRV_PCM_FORMAT_G723_24_1B] = {
202 .width = 3, .phys = 8, .le = -1, .signd = -1,
203 .silence = {},
205 [SNDRV_PCM_FORMAT_G723_40_1B] = {
206 .width = 5, .phys = 8, .le = -1, .signd = -1,
207 .silence = {},
213 * snd_pcm_format_signed - Check the PCM format is signed linear
214 * @format: the format to check
216 * Returns 1 if the given PCM format is signed linear, 0 if unsigned
217 * linear, and a negative error code for non-linear formats.
219 int snd_pcm_format_signed(snd_pcm_format_t format)
221 int val;
222 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
223 return -EINVAL;
224 if ((val = pcm_formats[(INT)format].signd) < 0)
225 return -EINVAL;
226 return val;
229 EXPORT_SYMBOL(snd_pcm_format_signed);
232 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
233 * @format: the format to check
235 * Returns 1 if the given PCM format is unsigned linear, 0 if signed
236 * linear, and a negative error code for non-linear formats.
238 int snd_pcm_format_unsigned(snd_pcm_format_t format)
240 int val;
242 val = snd_pcm_format_signed(format);
243 if (val < 0)
244 return val;
245 return !val;
248 EXPORT_SYMBOL(snd_pcm_format_unsigned);
251 * snd_pcm_format_linear - Check the PCM format is linear
252 * @format: the format to check
254 * Returns 1 if the given PCM format is linear, 0 if not.
256 int snd_pcm_format_linear(snd_pcm_format_t format)
258 return snd_pcm_format_signed(format) >= 0;
261 EXPORT_SYMBOL(snd_pcm_format_linear);
264 * snd_pcm_format_little_endian - Check the PCM format is little-endian
265 * @format: the format to check
267 * Returns 1 if the given PCM format is little-endian, 0 if
268 * big-endian, or a negative error code if endian not specified.
270 int snd_pcm_format_little_endian(snd_pcm_format_t format)
272 int val;
273 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
274 return -EINVAL;
275 if ((val = pcm_formats[(INT)format].le) < 0)
276 return -EINVAL;
277 return val;
280 EXPORT_SYMBOL(snd_pcm_format_little_endian);
283 * snd_pcm_format_big_endian - Check the PCM format is big-endian
284 * @format: the format to check
286 * Returns 1 if the given PCM format is big-endian, 0 if
287 * little-endian, or a negative error code if endian not specified.
289 int snd_pcm_format_big_endian(snd_pcm_format_t format)
291 int val;
293 val = snd_pcm_format_little_endian(format);
294 if (val < 0)
295 return val;
296 return !val;
299 EXPORT_SYMBOL(snd_pcm_format_big_endian);
302 * snd_pcm_format_width - return the bit-width of the format
303 * @format: the format to check
305 * Returns the bit-width of the format, or a negative error code
306 * if unknown format.
308 int snd_pcm_format_width(snd_pcm_format_t format)
310 int val;
311 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
312 return -EINVAL;
313 if ((val = pcm_formats[(INT)format].width) == 0)
314 return -EINVAL;
315 return val;
318 EXPORT_SYMBOL(snd_pcm_format_width);
321 * snd_pcm_format_physical_width - return the physical bit-width of the format
322 * @format: the format to check
324 * Returns the physical bit-width of the format, or a negative error code
325 * if unknown format.
327 int snd_pcm_format_physical_width(snd_pcm_format_t format)
329 int val;
330 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
331 return -EINVAL;
332 if ((val = pcm_formats[(INT)format].phys) == 0)
333 return -EINVAL;
334 return val;
337 EXPORT_SYMBOL(snd_pcm_format_physical_width);
340 * snd_pcm_format_size - return the byte size of samples on the given format
341 * @format: the format to check
342 * @samples: sampling rate
344 * Returns the byte size of the given samples for the format, or a
345 * negative error code if unknown format.
347 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
349 int phys_width = snd_pcm_format_physical_width(format);
350 if (phys_width < 0)
351 return -EINVAL;
352 return samples * phys_width / 8;
355 EXPORT_SYMBOL(snd_pcm_format_size);
358 * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
359 * @format: the format to check
361 * Returns the format pattern to fill or NULL if error.
363 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
365 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
366 return NULL;
367 if (! pcm_formats[(INT)format].phys)
368 return NULL;
369 return pcm_formats[(INT)format].silence;
372 EXPORT_SYMBOL(snd_pcm_format_silence_64);
375 * snd_pcm_format_set_silence - set the silence data on the buffer
376 * @format: the PCM format
377 * @data: the buffer pointer
378 * @samples: the number of samples to set silence
380 * Sets the silence data on the buffer for the given samples.
382 * Returns zero if successful, or a negative error code on failure.
384 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
386 int width;
387 unsigned char *dst, *pat;
389 if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
390 return -EINVAL;
391 if (samples == 0)
392 return 0;
393 width = pcm_formats[(INT)format].phys; /* physical width */
394 pat = pcm_formats[(INT)format].silence;
395 if (! width)
396 return -EINVAL;
397 /* signed or 1 byte data */
398 if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
399 unsigned int bytes = samples * width / 8;
400 memset(data, *pat, bytes);
401 return 0;
403 /* non-zero samples, fill using a loop */
404 width /= 8;
405 dst = data;
406 #if 0
407 while (samples--) {
408 memcpy(dst, pat, width);
409 dst += width;
411 #else
412 /* a bit optimization for constant width */
413 switch (width) {
414 case 2:
415 while (samples--) {
416 memcpy(dst, pat, 2);
417 dst += 2;
419 break;
420 case 3:
421 while (samples--) {
422 memcpy(dst, pat, 3);
423 dst += 3;
425 break;
426 case 4:
427 while (samples--) {
428 memcpy(dst, pat, 4);
429 dst += 4;
431 break;
432 case 8:
433 while (samples--) {
434 memcpy(dst, pat, 8);
435 dst += 8;
437 break;
439 #endif
440 return 0;
443 EXPORT_SYMBOL(snd_pcm_format_set_silence);
446 * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
447 * @runtime: the runtime instance
449 * Determines the rate_min and rate_max fields from the rates bits of
450 * the given runtime->hw.
452 * Returns zero if successful.
454 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
456 int i;
457 for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
458 if (runtime->hw.rates & (1 << i)) {
459 runtime->hw.rate_min = snd_pcm_known_rates.list[i];
460 break;
463 for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
464 if (runtime->hw.rates & (1 << i)) {
465 runtime->hw.rate_max = snd_pcm_known_rates.list[i];
466 break;
469 return 0;
472 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
475 * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
476 * @rate: the sample rate to convert
478 * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
479 * SNDRV_PCM_RATE_KNOT for an unknown rate.
481 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
483 unsigned int i;
485 for (i = 0; i < snd_pcm_known_rates.count; i++)
486 if (snd_pcm_known_rates.list[i] == rate)
487 return 1u << i;
488 return SNDRV_PCM_RATE_KNOT;
490 EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);