1 /*
2 * PCM Plug-In shared (kernel/library) code
3 * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>
4 * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Library General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #if 0
24 #define PLUGIN_DEBUG
25 #endif
26
27 #include <linux/slab.h>
28 #include <linux/time.h>
29 #include <linux/vmalloc.h>
30 #include <sound/core.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include "pcm_plugin.h"
34
35 #define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
36 #define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
37
38 /*
39 * because some cards might have rates "very close", we ignore
40 * all "resampling" requests within +-5%
41 */
rate_match(unsigned int src_rate,unsigned int dst_rate)42 static int rate_match(unsigned int src_rate, unsigned int dst_rate)
43 {
44 unsigned int low = (src_rate * 95) / 100;
45 unsigned int high = (src_rate * 105) / 100;
46 return dst_rate >= low && dst_rate <= high;
47 }
48
snd_pcm_plugin_alloc(struct snd_pcm_plugin * plugin,snd_pcm_uframes_t frames)49 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
50 {
51 struct snd_pcm_plugin_format *format;
52 ssize_t width;
53 size_t size;
54 unsigned int channel;
55 struct snd_pcm_plugin_channel *c;
56
57 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
58 format = &plugin->src_format;
59 } else {
60 format = &plugin->dst_format;
61 }
62 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
63 return width;
64 size = array3_size(frames, format->channels, width);
65 /* check for too large period size once again */
66 if (size > 1024 * 1024)
67 return -ENOMEM;
68 if (snd_BUG_ON(size % 8))
69 return -ENXIO;
70 size /= 8;
71 if (plugin->buf_frames < frames) {
72 kvfree(plugin->buf);
73 plugin->buf = kvzalloc(size, GFP_KERNEL);
74 plugin->buf_frames = frames;
75 }
76 if (!plugin->buf) {
77 plugin->buf_frames = 0;
78 return -ENOMEM;
79 }
80 c = plugin->buf_channels;
81 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
82 for (channel = 0; channel < format->channels; channel++, c++) {
83 c->frames = frames;
84 c->enabled = 1;
85 c->wanted = 0;
86 c->area.addr = plugin->buf;
87 c->area.first = channel * width;
88 c->area.step = format->channels * width;
89 }
90 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
91 if (snd_BUG_ON(size % format->channels))
92 return -EINVAL;
93 size /= format->channels;
94 for (channel = 0; channel < format->channels; channel++, c++) {
95 c->frames = frames;
96 c->enabled = 1;
97 c->wanted = 0;
98 c->area.addr = plugin->buf + (channel * size);
99 c->area.first = 0;
100 c->area.step = width;
101 }
102 } else
103 return -EINVAL;
104 return 0;
105 }
106
snd_pcm_plug_alloc(struct snd_pcm_substream * plug,snd_pcm_uframes_t frames)107 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
108 {
109 int err;
110 if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
111 return -ENXIO;
112 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
113 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
114 while (plugin->next) {
115 if (plugin->dst_frames)
116 frames = plugin->dst_frames(plugin, frames);
117 if ((snd_pcm_sframes_t)frames <= 0)
118 return -ENXIO;
119 plugin = plugin->next;
120 err = snd_pcm_plugin_alloc(plugin, frames);
121 if (err < 0)
122 return err;
123 }
124 } else {
125 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
126 while (plugin->prev) {
127 if (plugin->src_frames)
128 frames = plugin->src_frames(plugin, frames);
129 if ((snd_pcm_sframes_t)frames <= 0)
130 return -ENXIO;
131 plugin = plugin->prev;
132 err = snd_pcm_plugin_alloc(plugin, frames);
133 if (err < 0)
134 return err;
135 }
136 }
137 return 0;
138 }
139
140
snd_pcm_plugin_client_channels(struct snd_pcm_plugin * plugin,snd_pcm_uframes_t frames,struct snd_pcm_plugin_channel ** channels)141 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
142 snd_pcm_uframes_t frames,
143 struct snd_pcm_plugin_channel **channels)
144 {
145 *channels = plugin->buf_channels;
146 return frames;
147 }
148
snd_pcm_plugin_build(struct snd_pcm_substream * plug,const char * name,struct snd_pcm_plugin_format * src_format,struct snd_pcm_plugin_format * dst_format,size_t extra,struct snd_pcm_plugin ** ret)149 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
150 const char *name,
151 struct snd_pcm_plugin_format *src_format,
152 struct snd_pcm_plugin_format *dst_format,
153 size_t extra,
154 struct snd_pcm_plugin **ret)
155 {
156 struct snd_pcm_plugin *plugin;
157 unsigned int channels;
158
159 if (snd_BUG_ON(!plug))
160 return -ENXIO;
161 if (snd_BUG_ON(!src_format || !dst_format))
162 return -ENXIO;
163 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
164 if (plugin == NULL)
165 return -ENOMEM;
166 plugin->name = name;
167 plugin->plug = plug;
168 plugin->stream = snd_pcm_plug_stream(plug);
169 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
170 plugin->src_format = *src_format;
171 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
172 snd_BUG_ON(plugin->src_width <= 0);
173 plugin->dst_format = *dst_format;
174 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
175 snd_BUG_ON(plugin->dst_width <= 0);
176 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
177 channels = src_format->channels;
178 else
179 channels = dst_format->channels;
180 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
181 if (plugin->buf_channels == NULL) {
182 snd_pcm_plugin_free(plugin);
183 return -ENOMEM;
184 }
185 plugin->client_channels = snd_pcm_plugin_client_channels;
186 *ret = plugin;
187 return 0;
188 }
189
snd_pcm_plugin_free(struct snd_pcm_plugin * plugin)190 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
191 {
192 if (! plugin)
193 return 0;
194 if (plugin->private_free)
195 plugin->private_free(plugin);
196 kfree(plugin->buf_channels);
197 kvfree(plugin->buf);
198 kfree(plugin);
199 return 0;
200 }
201
calc_dst_frames(struct snd_pcm_substream * plug,snd_pcm_sframes_t frames,bool check_size)202 static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
203 snd_pcm_sframes_t frames,
204 bool check_size)
205 {
206 struct snd_pcm_plugin *plugin, *plugin_next;
207
208 plugin = snd_pcm_plug_first(plug);
209 while (plugin && frames > 0) {
210 plugin_next = plugin->next;
211 if (check_size && plugin->buf_frames &&
212 frames > plugin->buf_frames)
213 frames = plugin->buf_frames;
214 if (plugin->dst_frames) {
215 frames = plugin->dst_frames(plugin, frames);
216 if (frames < 0)
217 return frames;
218 }
219 plugin = plugin_next;
220 }
221 return frames;
222 }
223
calc_src_frames(struct snd_pcm_substream * plug,snd_pcm_sframes_t frames,bool check_size)224 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
225 snd_pcm_sframes_t frames,
226 bool check_size)
227 {
228 struct snd_pcm_plugin *plugin, *plugin_prev;
229
230 plugin = snd_pcm_plug_last(plug);
231 while (plugin && frames > 0) {
232 plugin_prev = plugin->prev;
233 if (plugin->src_frames) {
234 frames = plugin->src_frames(plugin, frames);
235 if (frames < 0)
236 return frames;
237 }
238 if (check_size && plugin->buf_frames &&
239 frames > plugin->buf_frames)
240 frames = plugin->buf_frames;
241 plugin = plugin_prev;
242 }
243 return frames;
244 }
245
snd_pcm_plug_client_size(struct snd_pcm_substream * plug,snd_pcm_uframes_t drv_frames)246 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
247 {
248 if (snd_BUG_ON(!plug))
249 return -ENXIO;
250 switch (snd_pcm_plug_stream(plug)) {
251 case SNDRV_PCM_STREAM_PLAYBACK:
252 return calc_src_frames(plug, drv_frames, false);
253 case SNDRV_PCM_STREAM_CAPTURE:
254 return calc_dst_frames(plug, drv_frames, false);
255 default:
256 snd_BUG();
257 return -EINVAL;
258 }
259 }
260
snd_pcm_plug_slave_size(struct snd_pcm_substream * plug,snd_pcm_uframes_t clt_frames)261 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
262 {
263 if (snd_BUG_ON(!plug))
264 return -ENXIO;
265 switch (snd_pcm_plug_stream(plug)) {
266 case SNDRV_PCM_STREAM_PLAYBACK:
267 return calc_dst_frames(plug, clt_frames, false);
268 case SNDRV_PCM_STREAM_CAPTURE:
269 return calc_src_frames(plug, clt_frames, false);
270 default:
271 snd_BUG();
272 return -EINVAL;
273 }
274 }
275
snd_pcm_plug_formats(const struct snd_mask * mask,snd_pcm_format_t format)276 static int snd_pcm_plug_formats(const struct snd_mask *mask,
277 snd_pcm_format_t format)
278 {
279 struct snd_mask formats = *mask;
280 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
281 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
282 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
283 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
284 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
285 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
286 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
287 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
288 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
289 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
290
291 if (formats.bits[0] & lower_32_bits(linfmts))
292 formats.bits[0] |= lower_32_bits(linfmts);
293 if (formats.bits[1] & upper_32_bits(linfmts))
294 formats.bits[1] |= upper_32_bits(linfmts);
295 return snd_mask_test(&formats, (__force int)format);
296 }
297
298 static const snd_pcm_format_t preferred_formats[] = {
299 SNDRV_PCM_FORMAT_S16_LE,
300 SNDRV_PCM_FORMAT_S16_BE,
301 SNDRV_PCM_FORMAT_U16_LE,
302 SNDRV_PCM_FORMAT_U16_BE,
303 SNDRV_PCM_FORMAT_S24_3LE,
304 SNDRV_PCM_FORMAT_S24_3BE,
305 SNDRV_PCM_FORMAT_U24_3LE,
306 SNDRV_PCM_FORMAT_U24_3BE,
307 SNDRV_PCM_FORMAT_S24_LE,
308 SNDRV_PCM_FORMAT_S24_BE,
309 SNDRV_PCM_FORMAT_U24_LE,
310 SNDRV_PCM_FORMAT_U24_BE,
311 SNDRV_PCM_FORMAT_S32_LE,
312 SNDRV_PCM_FORMAT_S32_BE,
313 SNDRV_PCM_FORMAT_U32_LE,
314 SNDRV_PCM_FORMAT_U32_BE,
315 SNDRV_PCM_FORMAT_S8,
316 SNDRV_PCM_FORMAT_U8
317 };
318
snd_pcm_plug_slave_format(snd_pcm_format_t format,const struct snd_mask * format_mask)319 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
320 const struct snd_mask *format_mask)
321 {
322 int i;
323
324 if (snd_mask_test(format_mask, (__force int)format))
325 return format;
326 if (!snd_pcm_plug_formats(format_mask, format))
327 return (__force snd_pcm_format_t)-EINVAL;
328 if (snd_pcm_format_linear(format)) {
329 unsigned int width = snd_pcm_format_width(format);
330 int unsignd = snd_pcm_format_unsigned(format) > 0;
331 int big = snd_pcm_format_big_endian(format) > 0;
332 unsigned int badness, best = -1;
333 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
334 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
335 snd_pcm_format_t f = preferred_formats[i];
336 unsigned int w;
337 if (!snd_mask_test(format_mask, (__force int)f))
338 continue;
339 w = snd_pcm_format_width(f);
340 if (w >= width)
341 badness = w - width;
342 else
343 badness = width - w + 32;
344 badness += snd_pcm_format_unsigned(f) != unsignd;
345 badness += snd_pcm_format_big_endian(f) != big;
346 if (badness < best) {
347 best_format = f;
348 best = badness;
349 }
350 }
351 if ((__force int)best_format >= 0)
352 return best_format;
353 else
354 return (__force snd_pcm_format_t)-EINVAL;
355 } else {
356 switch (format) {
357 case SNDRV_PCM_FORMAT_MU_LAW:
358 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
359 snd_pcm_format_t format1 = preferred_formats[i];
360 if (snd_mask_test(format_mask, (__force int)format1))
361 return format1;
362 }
363 fallthrough;
364 default:
365 return (__force snd_pcm_format_t)-EINVAL;
366 }
367 }
368 }
369
snd_pcm_plug_format_plugins(struct snd_pcm_substream * plug,struct snd_pcm_hw_params * params,struct snd_pcm_hw_params * slave_params)370 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
371 struct snd_pcm_hw_params *params,
372 struct snd_pcm_hw_params *slave_params)
373 {
374 struct snd_pcm_plugin_format tmpformat;
375 struct snd_pcm_plugin_format dstformat;
376 struct snd_pcm_plugin_format srcformat;
377 snd_pcm_access_t src_access, dst_access;
378 struct snd_pcm_plugin *plugin = NULL;
379 int err;
380 int stream = snd_pcm_plug_stream(plug);
381 int slave_interleaved = (params_channels(slave_params) == 1 ||
382 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
383
384 switch (stream) {
385 case SNDRV_PCM_STREAM_PLAYBACK:
386 dstformat.format = params_format(slave_params);
387 dstformat.rate = params_rate(slave_params);
388 dstformat.channels = params_channels(slave_params);
389 srcformat.format = params_format(params);
390 srcformat.rate = params_rate(params);
391 srcformat.channels = params_channels(params);
392 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
393 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
394 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
395 break;
396 case SNDRV_PCM_STREAM_CAPTURE:
397 dstformat.format = params_format(params);
398 dstformat.rate = params_rate(params);
399 dstformat.channels = params_channels(params);
400 srcformat.format = params_format(slave_params);
401 srcformat.rate = params_rate(slave_params);
402 srcformat.channels = params_channels(slave_params);
403 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
404 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
405 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
406 break;
407 default:
408 snd_BUG();
409 return -EINVAL;
410 }
411 tmpformat = srcformat;
412
413 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
414 srcformat.format,
415 srcformat.rate,
416 srcformat.channels);
417 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
418 dstformat.format,
419 dstformat.rate,
420 dstformat.channels);
421
422 /* Format change (linearization) */
423 if (! rate_match(srcformat.rate, dstformat.rate) &&
424 ! snd_pcm_format_linear(srcformat.format)) {
425 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
426 return -EINVAL;
427 tmpformat.format = SNDRV_PCM_FORMAT_S16;
428 err = snd_pcm_plugin_build_mulaw(plug,
429 &srcformat, &tmpformat,
430 &plugin);
431 if (err < 0)
432 return err;
433 err = snd_pcm_plugin_append(plugin);
434 if (err < 0) {
435 snd_pcm_plugin_free(plugin);
436 return err;
437 }
438 srcformat = tmpformat;
439 src_access = dst_access;
440 }
441
442 /* channels reduction */
443 if (srcformat.channels > dstformat.channels) {
444 tmpformat.channels = dstformat.channels;
445 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
446 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
447 if (err < 0)
448 return err;
449 err = snd_pcm_plugin_append(plugin);
450 if (err < 0) {
451 snd_pcm_plugin_free(plugin);
452 return err;
453 }
454 srcformat = tmpformat;
455 src_access = dst_access;
456 }
457
458 /* rate resampling */
459 if (!rate_match(srcformat.rate, dstformat.rate)) {
460 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
461 /* convert to S16 for resampling */
462 tmpformat.format = SNDRV_PCM_FORMAT_S16;
463 err = snd_pcm_plugin_build_linear(plug,
464 &srcformat, &tmpformat,
465 &plugin);
466 if (err < 0)
467 return err;
468 err = snd_pcm_plugin_append(plugin);
469 if (err < 0) {
470 snd_pcm_plugin_free(plugin);
471 return err;
472 }
473 srcformat = tmpformat;
474 src_access = dst_access;
475 }
476 tmpformat.rate = dstformat.rate;
477 err = snd_pcm_plugin_build_rate(plug,
478 &srcformat, &tmpformat,
479 &plugin);
480 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
481 if (err < 0)
482 return err;
483 err = snd_pcm_plugin_append(plugin);
484 if (err < 0) {
485 snd_pcm_plugin_free(plugin);
486 return err;
487 }
488 srcformat = tmpformat;
489 src_access = dst_access;
490 }
491
492 /* format change */
493 if (srcformat.format != dstformat.format) {
494 tmpformat.format = dstformat.format;
495 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
496 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
497 err = snd_pcm_plugin_build_mulaw(plug,
498 &srcformat, &tmpformat,
499 &plugin);
500 }
501 else if (snd_pcm_format_linear(srcformat.format) &&
502 snd_pcm_format_linear(tmpformat.format)) {
503 err = snd_pcm_plugin_build_linear(plug,
504 &srcformat, &tmpformat,
505 &plugin);
506 }
507 else
508 return -EINVAL;
509 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
510 if (err < 0)
511 return err;
512 err = snd_pcm_plugin_append(plugin);
513 if (err < 0) {
514 snd_pcm_plugin_free(plugin);
515 return err;
516 }
517 srcformat = tmpformat;
518 src_access = dst_access;
519 }
520
521 /* channels extension */
522 if (srcformat.channels < dstformat.channels) {
523 tmpformat.channels = dstformat.channels;
524 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
525 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
526 if (err < 0)
527 return err;
528 err = snd_pcm_plugin_append(plugin);
529 if (err < 0) {
530 snd_pcm_plugin_free(plugin);
531 return err;
532 }
533 srcformat = tmpformat;
534 src_access = dst_access;
535 }
536
537 /* de-interleave */
538 if (src_access != dst_access) {
539 err = snd_pcm_plugin_build_copy(plug,
540 &srcformat,
541 &tmpformat,
542 &plugin);
543 pdprintf("interleave change (copy: returns %i)\n", err);
544 if (err < 0)
545 return err;
546 err = snd_pcm_plugin_append(plugin);
547 if (err < 0) {
548 snd_pcm_plugin_free(plugin);
549 return err;
550 }
551 }
552
553 return 0;
554 }
555
snd_pcm_plug_client_channels_buf(struct snd_pcm_substream * plug,char * buf,snd_pcm_uframes_t count,struct snd_pcm_plugin_channel ** channels)556 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
557 char *buf,
558 snd_pcm_uframes_t count,
559 struct snd_pcm_plugin_channel **channels)
560 {
561 struct snd_pcm_plugin *plugin;
562 struct snd_pcm_plugin_channel *v;
563 struct snd_pcm_plugin_format *format;
564 int width, nchannels, channel;
565 int stream = snd_pcm_plug_stream(plug);
566
567 if (snd_BUG_ON(!buf))
568 return -ENXIO;
569 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
570 plugin = snd_pcm_plug_first(plug);
571 format = &plugin->src_format;
572 } else {
573 plugin = snd_pcm_plug_last(plug);
574 format = &plugin->dst_format;
575 }
576 v = plugin->buf_channels;
577 *channels = v;
578 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
579 return width;
580 nchannels = format->channels;
581 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
582 format->channels > 1))
583 return -ENXIO;
584 for (channel = 0; channel < nchannels; channel++, v++) {
585 v->frames = count;
586 v->enabled = 1;
587 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
588 v->area.addr = buf;
589 v->area.first = channel * width;
590 v->area.step = nchannels * width;
591 }
592 return count;
593 }
594
snd_pcm_plug_write_transfer(struct snd_pcm_substream * plug,struct snd_pcm_plugin_channel * src_channels,snd_pcm_uframes_t size)595 snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size)
596 {
597 struct snd_pcm_plugin *plugin, *next;
598 struct snd_pcm_plugin_channel *dst_channels;
599 int err;
600 snd_pcm_sframes_t frames = size;
601
602 plugin = snd_pcm_plug_first(plug);
603 while (plugin) {
604 if (frames <= 0)
605 return frames;
606 if ((next = plugin->next) != NULL) {
607 snd_pcm_sframes_t frames1 = frames;
608 if (plugin->dst_frames) {
609 frames1 = plugin->dst_frames(plugin, frames);
610 if (frames1 <= 0)
611 return frames1;
612 }
613 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
614 return err;
615 }
616 if (err != frames1) {
617 frames = err;
618 if (plugin->src_frames) {
619 frames = plugin->src_frames(plugin, frames1);
620 if (frames <= 0)
621 return frames;
622 }
623 }
624 } else
625 dst_channels = NULL;
626 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
627 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
628 return frames;
629 src_channels = dst_channels;
630 plugin = next;
631 }
632 return calc_src_frames(plug, frames, true);
633 }
634
snd_pcm_plug_read_transfer(struct snd_pcm_substream * plug,struct snd_pcm_plugin_channel * dst_channels_final,snd_pcm_uframes_t size)635 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
636 {
637 struct snd_pcm_plugin *plugin, *next;
638 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
639 snd_pcm_sframes_t frames = size;
640 int err;
641
642 frames = calc_src_frames(plug, frames, true);
643 if (frames < 0)
644 return frames;
645
646 src_channels = NULL;
647 plugin = snd_pcm_plug_first(plug);
648 while (plugin && frames > 0) {
649 if ((next = plugin->next) != NULL) {
650 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
651 return err;
652 }
653 frames = err;
654 } else {
655 dst_channels = dst_channels_final;
656 }
657 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
658 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
659 return frames;
660 plugin = next;
661 src_channels = dst_channels;
662 }
663 return frames;
664 }
665
snd_pcm_area_silence(const struct snd_pcm_channel_area * dst_area,size_t dst_offset,size_t samples,snd_pcm_format_t format)666 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
667 size_t samples, snd_pcm_format_t format)
668 {
669 /* FIXME: sub byte resolution and odd dst_offset */
670 unsigned char *dst;
671 unsigned int dst_step;
672 int width;
673 const unsigned char *silence;
674 if (!dst_area->addr)
675 return 0;
676 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
677 width = snd_pcm_format_physical_width(format);
678 if (width <= 0)
679 return -EINVAL;
680 if (dst_area->step == (unsigned int) width && width >= 8)
681 return snd_pcm_format_set_silence(format, dst, samples);
682 silence = snd_pcm_format_silence_64(format);
683 if (! silence)
684 return -EINVAL;
685 dst_step = dst_area->step / 8;
686 if (width == 4) {
687 /* Ima ADPCM */
688 int dstbit = dst_area->first % 8;
689 int dstbit_step = dst_area->step % 8;
690 while (samples-- > 0) {
691 if (dstbit)
692 *dst &= 0xf0;
693 else
694 *dst &= 0x0f;
695 dst += dst_step;
696 dstbit += dstbit_step;
697 if (dstbit == 8) {
698 dst++;
699 dstbit = 0;
700 }
701 }
702 } else {
703 width /= 8;
704 while (samples-- > 0) {
705 memcpy(dst, silence, width);
706 dst += dst_step;
707 }
708 }
709 return 0;
710 }
711
snd_pcm_area_copy(const struct snd_pcm_channel_area * src_area,size_t src_offset,const struct snd_pcm_channel_area * dst_area,size_t dst_offset,size_t samples,snd_pcm_format_t format)712 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
713 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
714 size_t samples, snd_pcm_format_t format)
715 {
716 /* FIXME: sub byte resolution and odd dst_offset */
717 char *src, *dst;
718 int width;
719 int src_step, dst_step;
720 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
721 if (!src_area->addr)
722 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
723 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
724 if (!dst_area->addr)
725 return 0;
726 width = snd_pcm_format_physical_width(format);
727 if (width <= 0)
728 return -EINVAL;
729 if (src_area->step == (unsigned int) width &&
730 dst_area->step == (unsigned int) width && width >= 8) {
731 size_t bytes = samples * width / 8;
732 memcpy(dst, src, bytes);
733 return 0;
734 }
735 src_step = src_area->step / 8;
736 dst_step = dst_area->step / 8;
737 if (width == 4) {
738 /* Ima ADPCM */
739 int srcbit = src_area->first % 8;
740 int srcbit_step = src_area->step % 8;
741 int dstbit = dst_area->first % 8;
742 int dstbit_step = dst_area->step % 8;
743 while (samples-- > 0) {
744 unsigned char srcval;
745 if (srcbit)
746 srcval = *src & 0x0f;
747 else
748 srcval = (*src & 0xf0) >> 4;
749 if (dstbit)
750 *dst = (*dst & 0xf0) | srcval;
751 else
752 *dst = (*dst & 0x0f) | (srcval << 4);
753 src += src_step;
754 srcbit += srcbit_step;
755 if (srcbit == 8) {
756 src++;
757 srcbit = 0;
758 }
759 dst += dst_step;
760 dstbit += dstbit_step;
761 if (dstbit == 8) {
762 dst++;
763 dstbit = 0;
764 }
765 }
766 } else {
767 width /= 8;
768 while (samples-- > 0) {
769 memcpy(dst, src, width);
770 src += src_step;
771 dst += dst_step;
772 }
773 }
774 return 0;
775 }
776