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1 | /* |
2 | * PCM Interface - misc routines |
3 | * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz> |
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 | |
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, |
77 | .silence = { 0x00, 0x80, 0x00, 0x00 }, |
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 | |
209 | EXPORT_SYMBOL(snd_pcm_format_signed); |
210 | |
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 | |
228 | EXPORT_SYMBOL(snd_pcm_format_unsigned); |
229 | |
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 | |
241 | EXPORT_SYMBOL(snd_pcm_format_linear); |
242 | |
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 | |
260 | EXPORT_SYMBOL(snd_pcm_format_little_endian); |
261 | |
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 | |
279 | EXPORT_SYMBOL(snd_pcm_format_big_endian); |
280 | |
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 | |
298 | EXPORT_SYMBOL(snd_pcm_format_width); |
299 | |
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 | |
317 | EXPORT_SYMBOL(snd_pcm_format_physical_width); |
318 | |
319 | /** |
320 | * snd_pcm_format_size - return the byte size of samples on the given format |
321 | * @format: the format to check |
322 | * @samples: sampling rate |
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 | |
335 | EXPORT_SYMBOL(snd_pcm_format_size); |
336 | |
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 | |
352 | EXPORT_SYMBOL(snd_pcm_format_silence_64); |
353 | |
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 | |
423 | EXPORT_SYMBOL(snd_pcm_format_set_silence); |
424 | |
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 | */ |
434 | int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) |
435 | { |
436 | int i; |
437 | for (i = 0; i < (int)snd_pcm_known_rates.count; i++) { |
438 | if (runtime->hw.rates & (1 << i)) { |
439 | runtime->hw.rate_min = snd_pcm_known_rates.list[i]; |
440 | break; |
441 | } |
442 | } |
443 | for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) { |
444 | if (runtime->hw.rates & (1 << i)) { |
445 | runtime->hw.rate_max = snd_pcm_known_rates.list[i]; |
446 | break; |
447 | } |
448 | } |
449 | return 0; |
450 | } |
451 | |
452 | EXPORT_SYMBOL(snd_pcm_limit_hw_rates); |
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); |
471 |
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