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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 LT |
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 | */ | |
30 | struct 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 | static struct pcm_format_data pcm_formats[SNDRV_PCM_FORMAT_LAST+1] = { | |
39 | [SNDRV_PCM_FORMAT_S8] = { | |
40 | .width = 8, .phys = 8, .le = -1, .signd = 1, | |
41 | .silence = {}, | |
42 | }, | |
43 | [SNDRV_PCM_FORMAT_U8] = { | |
44 | .width = 8, .phys = 8, .le = -1, .signd = 0, | |
45 | .silence = { 0x80 }, | |
46 | }, | |
47 | [SNDRV_PCM_FORMAT_S16_LE] = { | |
48 | .width = 16, .phys = 16, .le = 1, .signd = 1, | |
49 | .silence = {}, | |
50 | }, | |
51 | [SNDRV_PCM_FORMAT_S16_BE] = { | |
52 | .width = 16, .phys = 16, .le = 0, .signd = 1, | |
53 | .silence = {}, | |
54 | }, | |
55 | [SNDRV_PCM_FORMAT_U16_LE] = { | |
56 | .width = 16, .phys = 16, .le = 1, .signd = 0, | |
57 | .silence = { 0x00, 0x80 }, | |
58 | }, | |
59 | [SNDRV_PCM_FORMAT_U16_BE] = { | |
60 | .width = 16, .phys = 16, .le = 0, .signd = 0, | |
61 | .silence = { 0x80, 0x00 }, | |
62 | }, | |
63 | [SNDRV_PCM_FORMAT_S24_LE] = { | |
64 | .width = 24, .phys = 32, .le = 1, .signd = 1, | |
65 | .silence = {}, | |
66 | }, | |
67 | [SNDRV_PCM_FORMAT_S24_BE] = { | |
68 | .width = 24, .phys = 32, .le = 0, .signd = 1, | |
69 | .silence = {}, | |
70 | }, | |
71 | [SNDRV_PCM_FORMAT_U24_LE] = { | |
72 | .width = 24, .phys = 32, .le = 1, .signd = 0, | |
73 | .silence = { 0x00, 0x00, 0x80 }, | |
74 | }, | |
75 | [SNDRV_PCM_FORMAT_U24_BE] = { | |
76 | .width = 24, .phys = 32, .le = 0, .signd = 0, | |
67a7be7e | 77 | .silence = { 0x00, 0x80, 0x00, 0x00 }, |
1da177e4 LT |
78 | }, |
79 | [SNDRV_PCM_FORMAT_S32_LE] = { | |
80 | .width = 32, .phys = 32, .le = 1, .signd = 1, | |
81 | .silence = {}, | |
82 | }, | |
83 | [SNDRV_PCM_FORMAT_S32_BE] = { | |
84 | .width = 32, .phys = 32, .le = 0, .signd = 1, | |
85 | .silence = {}, | |
86 | }, | |
87 | [SNDRV_PCM_FORMAT_U32_LE] = { | |
88 | .width = 32, .phys = 32, .le = 1, .signd = 0, | |
89 | .silence = { 0x00, 0x00, 0x00, 0x80 }, | |
90 | }, | |
91 | [SNDRV_PCM_FORMAT_U32_BE] = { | |
92 | .width = 32, .phys = 32, .le = 0, .signd = 0, | |
93 | .silence = { 0x80, 0x00, 0x00, 0x00 }, | |
94 | }, | |
95 | [SNDRV_PCM_FORMAT_FLOAT_LE] = { | |
96 | .width = 32, .phys = 32, .le = 1, .signd = -1, | |
97 | .silence = {}, | |
98 | }, | |
99 | [SNDRV_PCM_FORMAT_FLOAT_BE] = { | |
100 | .width = 32, .phys = 32, .le = 0, .signd = -1, | |
101 | .silence = {}, | |
102 | }, | |
103 | [SNDRV_PCM_FORMAT_FLOAT64_LE] = { | |
104 | .width = 64, .phys = 64, .le = 1, .signd = -1, | |
105 | .silence = {}, | |
106 | }, | |
107 | [SNDRV_PCM_FORMAT_FLOAT64_BE] = { | |
108 | .width = 64, .phys = 64, .le = 0, .signd = -1, | |
109 | .silence = {}, | |
110 | }, | |
111 | [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = { | |
112 | .width = 32, .phys = 32, .le = 1, .signd = -1, | |
113 | .silence = {}, | |
114 | }, | |
115 | [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = { | |
116 | .width = 32, .phys = 32, .le = 0, .signd = -1, | |
117 | .silence = {}, | |
118 | }, | |
119 | [SNDRV_PCM_FORMAT_MU_LAW] = { | |
120 | .width = 8, .phys = 8, .le = -1, .signd = -1, | |
121 | .silence = { 0x7f }, | |
122 | }, | |
123 | [SNDRV_PCM_FORMAT_A_LAW] = { | |
124 | .width = 8, .phys = 8, .le = -1, .signd = -1, | |
125 | .silence = { 0x55 }, | |
126 | }, | |
127 | [SNDRV_PCM_FORMAT_IMA_ADPCM] = { | |
128 | .width = 4, .phys = 4, .le = -1, .signd = -1, | |
129 | .silence = {}, | |
130 | }, | |
131 | /* FIXME: the following three formats are not defined properly yet */ | |
132 | [SNDRV_PCM_FORMAT_MPEG] = { | |
133 | .le = -1, .signd = -1, | |
134 | }, | |
135 | [SNDRV_PCM_FORMAT_GSM] = { | |
136 | .le = -1, .signd = -1, | |
137 | }, | |
138 | [SNDRV_PCM_FORMAT_SPECIAL] = { | |
139 | .le = -1, .signd = -1, | |
140 | }, | |
141 | [SNDRV_PCM_FORMAT_S24_3LE] = { | |
142 | .width = 24, .phys = 24, .le = 1, .signd = 1, | |
143 | .silence = {}, | |
144 | }, | |
145 | [SNDRV_PCM_FORMAT_S24_3BE] = { | |
146 | .width = 24, .phys = 24, .le = 0, .signd = 1, | |
147 | .silence = {}, | |
148 | }, | |
149 | [SNDRV_PCM_FORMAT_U24_3LE] = { | |
150 | .width = 24, .phys = 24, .le = 1, .signd = 0, | |
151 | .silence = { 0x00, 0x00, 0x80 }, | |
152 | }, | |
153 | [SNDRV_PCM_FORMAT_U24_3BE] = { | |
154 | .width = 24, .phys = 24, .le = 0, .signd = 0, | |
155 | .silence = { 0x80, 0x00, 0x00 }, | |
156 | }, | |
157 | [SNDRV_PCM_FORMAT_S20_3LE] = { | |
158 | .width = 20, .phys = 24, .le = 1, .signd = 1, | |
159 | .silence = {}, | |
160 | }, | |
161 | [SNDRV_PCM_FORMAT_S20_3BE] = { | |
162 | .width = 20, .phys = 24, .le = 0, .signd = 1, | |
163 | .silence = {}, | |
164 | }, | |
165 | [SNDRV_PCM_FORMAT_U20_3LE] = { | |
166 | .width = 20, .phys = 24, .le = 1, .signd = 0, | |
167 | .silence = { 0x00, 0x00, 0x08 }, | |
168 | }, | |
169 | [SNDRV_PCM_FORMAT_U20_3BE] = { | |
170 | .width = 20, .phys = 24, .le = 0, .signd = 0, | |
171 | .silence = { 0x08, 0x00, 0x00 }, | |
172 | }, | |
173 | [SNDRV_PCM_FORMAT_S18_3LE] = { | |
174 | .width = 18, .phys = 24, .le = 1, .signd = 1, | |
175 | .silence = {}, | |
176 | }, | |
177 | [SNDRV_PCM_FORMAT_S18_3BE] = { | |
178 | .width = 18, .phys = 24, .le = 0, .signd = 1, | |
179 | .silence = {}, | |
180 | }, | |
181 | [SNDRV_PCM_FORMAT_U18_3LE] = { | |
182 | .width = 18, .phys = 24, .le = 1, .signd = 0, | |
183 | .silence = { 0x00, 0x00, 0x02 }, | |
184 | }, | |
185 | [SNDRV_PCM_FORMAT_U18_3BE] = { | |
186 | .width = 18, .phys = 24, .le = 0, .signd = 0, | |
187 | .silence = { 0x02, 0x00, 0x00 }, | |
188 | }, | |
189 | }; | |
190 | ||
191 | ||
192 | /** | |
193 | * snd_pcm_format_signed - Check the PCM format is signed linear | |
194 | * @format: the format to check | |
195 | * | |
196 | * Returns 1 if the given PCM format is signed linear, 0 if unsigned | |
197 | * linear, and a negative error code for non-linear formats. | |
198 | */ | |
199 | int snd_pcm_format_signed(snd_pcm_format_t format) | |
200 | { | |
201 | int val; | |
202 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
203 | return -EINVAL; | |
204 | if ((val = pcm_formats[format].signd) < 0) | |
205 | return -EINVAL; | |
206 | return val; | |
207 | } | |
208 | ||
e88e8ae6 TI |
209 | EXPORT_SYMBOL(snd_pcm_format_signed); |
210 | ||
1da177e4 LT |
211 | /** |
212 | * snd_pcm_format_unsigned - Check the PCM format is unsigned linear | |
213 | * @format: the format to check | |
214 | * | |
215 | * Returns 1 if the given PCM format is unsigned linear, 0 if signed | |
216 | * linear, and a negative error code for non-linear formats. | |
217 | */ | |
218 | int snd_pcm_format_unsigned(snd_pcm_format_t format) | |
219 | { | |
220 | int val; | |
221 | ||
222 | val = snd_pcm_format_signed(format); | |
223 | if (val < 0) | |
224 | return val; | |
225 | return !val; | |
226 | } | |
227 | ||
e88e8ae6 TI |
228 | EXPORT_SYMBOL(snd_pcm_format_unsigned); |
229 | ||
1da177e4 LT |
230 | /** |
231 | * snd_pcm_format_linear - Check the PCM format is linear | |
232 | * @format: the format to check | |
233 | * | |
234 | * Returns 1 if the given PCM format is linear, 0 if not. | |
235 | */ | |
236 | int snd_pcm_format_linear(snd_pcm_format_t format) | |
237 | { | |
238 | return snd_pcm_format_signed(format) >= 0; | |
239 | } | |
240 | ||
e88e8ae6 TI |
241 | EXPORT_SYMBOL(snd_pcm_format_linear); |
242 | ||
1da177e4 LT |
243 | /** |
244 | * snd_pcm_format_little_endian - Check the PCM format is little-endian | |
245 | * @format: the format to check | |
246 | * | |
247 | * Returns 1 if the given PCM format is little-endian, 0 if | |
248 | * big-endian, or a negative error code if endian not specified. | |
249 | */ | |
250 | int snd_pcm_format_little_endian(snd_pcm_format_t format) | |
251 | { | |
252 | int val; | |
253 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
254 | return -EINVAL; | |
255 | if ((val = pcm_formats[format].le) < 0) | |
256 | return -EINVAL; | |
257 | return val; | |
258 | } | |
259 | ||
e88e8ae6 TI |
260 | EXPORT_SYMBOL(snd_pcm_format_little_endian); |
261 | ||
1da177e4 LT |
262 | /** |
263 | * snd_pcm_format_big_endian - Check the PCM format is big-endian | |
264 | * @format: the format to check | |
265 | * | |
266 | * Returns 1 if the given PCM format is big-endian, 0 if | |
267 | * little-endian, or a negative error code if endian not specified. | |
268 | */ | |
269 | int snd_pcm_format_big_endian(snd_pcm_format_t format) | |
270 | { | |
271 | int val; | |
272 | ||
273 | val = snd_pcm_format_little_endian(format); | |
274 | if (val < 0) | |
275 | return val; | |
276 | return !val; | |
277 | } | |
278 | ||
e88e8ae6 TI |
279 | EXPORT_SYMBOL(snd_pcm_format_big_endian); |
280 | ||
1da177e4 LT |
281 | /** |
282 | * snd_pcm_format_width - return the bit-width of the format | |
283 | * @format: the format to check | |
284 | * | |
285 | * Returns the bit-width of the format, or a negative error code | |
286 | * if unknown format. | |
287 | */ | |
288 | int snd_pcm_format_width(snd_pcm_format_t format) | |
289 | { | |
290 | int val; | |
291 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
292 | return -EINVAL; | |
293 | if ((val = pcm_formats[format].width) == 0) | |
294 | return -EINVAL; | |
295 | return val; | |
296 | } | |
297 | ||
e88e8ae6 TI |
298 | EXPORT_SYMBOL(snd_pcm_format_width); |
299 | ||
1da177e4 LT |
300 | /** |
301 | * snd_pcm_format_physical_width - return the physical bit-width of the format | |
302 | * @format: the format to check | |
303 | * | |
304 | * Returns the physical bit-width of the format, or a negative error code | |
305 | * if unknown format. | |
306 | */ | |
307 | int snd_pcm_format_physical_width(snd_pcm_format_t format) | |
308 | { | |
309 | int val; | |
310 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
311 | return -EINVAL; | |
312 | if ((val = pcm_formats[format].phys) == 0) | |
313 | return -EINVAL; | |
314 | return val; | |
315 | } | |
316 | ||
e88e8ae6 TI |
317 | EXPORT_SYMBOL(snd_pcm_format_physical_width); |
318 | ||
1da177e4 LT |
319 | /** |
320 | * snd_pcm_format_size - return the byte size of samples on the given format | |
321 | * @format: the format to check | |
a66547f3 | 322 | * @samples: sampling rate |
1da177e4 LT |
323 | * |
324 | * Returns the byte size of the given samples for the format, or a | |
325 | * negative error code if unknown format. | |
326 | */ | |
327 | ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples) | |
328 | { | |
329 | int phys_width = snd_pcm_format_physical_width(format); | |
330 | if (phys_width < 0) | |
331 | return -EINVAL; | |
332 | return samples * phys_width / 8; | |
333 | } | |
334 | ||
e88e8ae6 TI |
335 | EXPORT_SYMBOL(snd_pcm_format_size); |
336 | ||
1da177e4 LT |
337 | /** |
338 | * snd_pcm_format_silence_64 - return the silent data in 8 bytes array | |
339 | * @format: the format to check | |
340 | * | |
341 | * Returns the format pattern to fill or NULL if error. | |
342 | */ | |
343 | const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format) | |
344 | { | |
345 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
346 | return NULL; | |
347 | if (! pcm_formats[format].phys) | |
348 | return NULL; | |
349 | return pcm_formats[format].silence; | |
350 | } | |
351 | ||
e88e8ae6 TI |
352 | EXPORT_SYMBOL(snd_pcm_format_silence_64); |
353 | ||
1da177e4 LT |
354 | /** |
355 | * snd_pcm_format_set_silence - set the silence data on the buffer | |
356 | * @format: the PCM format | |
357 | * @data: the buffer pointer | |
358 | * @samples: the number of samples to set silence | |
359 | * | |
360 | * Sets the silence data on the buffer for the given samples. | |
361 | * | |
362 | * Returns zero if successful, or a negative error code on failure. | |
363 | */ | |
364 | int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) | |
365 | { | |
366 | int width; | |
367 | unsigned char *dst, *pat; | |
368 | ||
369 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) | |
370 | return -EINVAL; | |
371 | if (samples == 0) | |
372 | return 0; | |
373 | width = pcm_formats[format].phys; /* physical width */ | |
374 | pat = pcm_formats[format].silence; | |
375 | if (! width) | |
376 | return -EINVAL; | |
377 | /* signed or 1 byte data */ | |
378 | if (pcm_formats[format].signd == 1 || width <= 8) { | |
379 | unsigned int bytes = samples * width / 8; | |
380 | memset(data, *pat, bytes); | |
381 | return 0; | |
382 | } | |
383 | /* non-zero samples, fill using a loop */ | |
384 | width /= 8; | |
385 | dst = data; | |
386 | #if 0 | |
387 | while (samples--) { | |
388 | memcpy(dst, pat, width); | |
389 | dst += width; | |
390 | } | |
391 | #else | |
392 | /* a bit optimization for constant width */ | |
393 | switch (width) { | |
394 | case 2: | |
395 | while (samples--) { | |
396 | memcpy(dst, pat, 2); | |
397 | dst += 2; | |
398 | } | |
399 | break; | |
400 | case 3: | |
401 | while (samples--) { | |
402 | memcpy(dst, pat, 3); | |
403 | dst += 3; | |
404 | } | |
405 | break; | |
406 | case 4: | |
407 | while (samples--) { | |
408 | memcpy(dst, pat, 4); | |
409 | dst += 4; | |
410 | } | |
411 | break; | |
412 | case 8: | |
413 | while (samples--) { | |
414 | memcpy(dst, pat, 8); | |
415 | dst += 8; | |
416 | } | |
417 | break; | |
418 | } | |
419 | #endif | |
420 | return 0; | |
421 | } | |
422 | ||
e88e8ae6 TI |
423 | EXPORT_SYMBOL(snd_pcm_format_set_silence); |
424 | ||
1da177e4 LT |
425 | /** |
426 | * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields | |
427 | * @runtime: the runtime instance | |
428 | * | |
429 | * Determines the rate_min and rate_max fields from the rates bits of | |
430 | * the given runtime->hw. | |
431 | * | |
432 | * Returns zero if successful. | |
433 | */ | |
877211f5 | 434 | int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) |
1da177e4 | 435 | { |
1da177e4 | 436 | int i; |
7653d557 | 437 | for (i = 0; i < (int)snd_pcm_known_rates.count; i++) { |
1da177e4 | 438 | if (runtime->hw.rates & (1 << i)) { |
7653d557 | 439 | runtime->hw.rate_min = snd_pcm_known_rates.list[i]; |
1da177e4 LT |
440 | break; |
441 | } | |
442 | } | |
7653d557 | 443 | for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) { |
1da177e4 | 444 | if (runtime->hw.rates & (1 << i)) { |
7653d557 | 445 | runtime->hw.rate_max = snd_pcm_known_rates.list[i]; |
1da177e4 LT |
446 | break; |
447 | } | |
448 | } | |
449 | return 0; | |
450 | } | |
e88e8ae6 TI |
451 | |
452 | EXPORT_SYMBOL(snd_pcm_limit_hw_rates); | |
918f3a0e CL |
453 | |
454 | /** | |
455 | * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit | |
456 | * @rate: the sample rate to convert | |
457 | * | |
458 | * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or | |
459 | * SNDRV_PCM_RATE_KNOT for an unknown rate. | |
460 | */ | |
461 | unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) | |
462 | { | |
463 | unsigned int i; | |
464 | ||
465 | for (i = 0; i < snd_pcm_known_rates.count; i++) | |
466 | if (snd_pcm_known_rates.list[i] == rate) | |
467 | return 1u << i; | |
468 | return SNDRV_PCM_RATE_KNOT; | |
469 | } | |
470 | EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit); |