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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 */
42static 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
49static 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 = frames * format->channels * width;
65 if (snd_BUG_ON(size % 8))
66 return -ENXIO;
67 size /= 8;
68 if (plugin->buf_frames < frames) {
69 vfree(plugin->buf);
70 plugin->buf = vmalloc(size);
71 plugin->buf_frames = frames;
72 }
73 if (!plugin->buf) {
74 plugin->buf_frames = 0;
75 return -ENOMEM;
76 }
77 c = plugin->buf_channels;
78 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
79 for (channel = 0; channel < format->channels; channel++, c++) {
80 c->frames = frames;
81 c->enabled = 1;
82 c->wanted = 0;
83 c->area.addr = plugin->buf;
84 c->area.first = channel * width;
85 c->area.step = format->channels * width;
86 }
87 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
88 if (snd_BUG_ON(size % format->channels))
89 return -EINVAL;
90 size /= format->channels;
91 for (channel = 0; channel < format->channels; channel++, c++) {
92 c->frames = frames;
93 c->enabled = 1;
94 c->wanted = 0;
95 c->area.addr = plugin->buf + (channel * size);
96 c->area.first = 0;
97 c->area.step = width;
98 }
99 } else
100 return -EINVAL;
101 return 0;
102}
103
104int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
105{
106 int err;
107 if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
108 return -ENXIO;
109 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
110 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
111 while (plugin->next) {
112 if (plugin->dst_frames)
113 frames = plugin->dst_frames(plugin, frames);
114 if (snd_BUG_ON(frames <= 0))
115 return -ENXIO;
116 plugin = plugin->next;
117 err = snd_pcm_plugin_alloc(plugin, frames);
118 if (err < 0)
119 return err;
120 }
121 } else {
122 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
123 while (plugin->prev) {
124 if (plugin->src_frames)
125 frames = plugin->src_frames(plugin, frames);
126 if (snd_BUG_ON(frames <= 0))
127 return -ENXIO;
128 plugin = plugin->prev;
129 err = snd_pcm_plugin_alloc(plugin, frames);
130 if (err < 0)
131 return err;
132 }
133 }
134 return 0;
135}
136
137
138snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
139 snd_pcm_uframes_t frames,
140 struct snd_pcm_plugin_channel **channels)
141{
142 *channels = plugin->buf_channels;
143 return frames;
144}
145
146int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
147 const char *name,
148 struct snd_pcm_plugin_format *src_format,
149 struct snd_pcm_plugin_format *dst_format,
150 size_t extra,
151 struct snd_pcm_plugin **ret)
152{
153 struct snd_pcm_plugin *plugin;
154 unsigned int channels;
155
156 if (snd_BUG_ON(!plug))
157 return -ENXIO;
158 if (snd_BUG_ON(!src_format || !dst_format))
159 return -ENXIO;
160 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
161 if (plugin == NULL)
162 return -ENOMEM;
163 plugin->name = name;
164 plugin->plug = plug;
165 plugin->stream = snd_pcm_plug_stream(plug);
166 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
167 plugin->src_format = *src_format;
168 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
169 snd_BUG_ON(plugin->src_width <= 0);
170 plugin->dst_format = *dst_format;
171 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
172 snd_BUG_ON(plugin->dst_width <= 0);
173 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
174 channels = src_format->channels;
175 else
176 channels = dst_format->channels;
177 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
178 if (plugin->buf_channels == NULL) {
179 snd_pcm_plugin_free(plugin);
180 return -ENOMEM;
181 }
182 plugin->client_channels = snd_pcm_plugin_client_channels;
183 *ret = plugin;
184 return 0;
185}
186
187int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
188{
189 if (! plugin)
190 return 0;
191 if (plugin->private_free)
192 plugin->private_free(plugin);
193 kfree(plugin->buf_channels);
194 vfree(plugin->buf);
195 kfree(plugin);
196 return 0;
197}
198
199snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
200{
201 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
202 int stream;
203
204 if (snd_BUG_ON(!plug))
205 return -ENXIO;
206 if (drv_frames == 0)
207 return 0;
208 stream = snd_pcm_plug_stream(plug);
209 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
210 plugin = snd_pcm_plug_last(plug);
211 while (plugin && drv_frames > 0) {
212 plugin_prev = plugin->prev;
213 if (plugin->src_frames)
214 drv_frames = plugin->src_frames(plugin, drv_frames);
215 plugin = plugin_prev;
216 }
217 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
218 plugin = snd_pcm_plug_first(plug);
219 while (plugin && drv_frames > 0) {
220 plugin_next = plugin->next;
221 if (plugin->dst_frames)
222 drv_frames = plugin->dst_frames(plugin, drv_frames);
223 plugin = plugin_next;
224 }
225 } else
226 snd_BUG();
227 return drv_frames;
228}
229
230snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
231{
232 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
233 snd_pcm_sframes_t frames;
234 int stream;
235
236 if (snd_BUG_ON(!plug))
237 return -ENXIO;
238 if (clt_frames == 0)
239 return 0;
240 frames = clt_frames;
241 stream = snd_pcm_plug_stream(plug);
242 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
243 plugin = snd_pcm_plug_first(plug);
244 while (plugin && frames > 0) {
245 plugin_next = plugin->next;
246 if (plugin->dst_frames) {
247 frames = plugin->dst_frames(plugin, frames);
248 if (frames < 0)
249 return frames;
250 }
251 plugin = plugin_next;
252 }
253 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
254 plugin = snd_pcm_plug_last(plug);
255 while (plugin) {
256 plugin_prev = plugin->prev;
257 if (plugin->src_frames) {
258 frames = plugin->src_frames(plugin, frames);
259 if (frames < 0)
260 return frames;
261 }
262 plugin = plugin_prev;
263 }
264 } else
265 snd_BUG();
266 return frames;
267}
268
269static int snd_pcm_plug_formats(const struct snd_mask *mask,
270 snd_pcm_format_t format)
271{
272 struct snd_mask formats = *mask;
273 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
274 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
275 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
276 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
277 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
278 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
279 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
280 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
281 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
282 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
283
284 if (formats.bits[0] & (u32)linfmts)
285 formats.bits[0] |= (u32)linfmts;
286 if (formats.bits[1] & (u32)(linfmts >> 32))
287 formats.bits[1] |= (u32)(linfmts >> 32);
288 return snd_mask_test(&formats, (__force int)format);
289}
290
291static snd_pcm_format_t preferred_formats[] = {
292 SNDRV_PCM_FORMAT_S16_LE,
293 SNDRV_PCM_FORMAT_S16_BE,
294 SNDRV_PCM_FORMAT_U16_LE,
295 SNDRV_PCM_FORMAT_U16_BE,
296 SNDRV_PCM_FORMAT_S24_3LE,
297 SNDRV_PCM_FORMAT_S24_3BE,
298 SNDRV_PCM_FORMAT_U24_3LE,
299 SNDRV_PCM_FORMAT_U24_3BE,
300 SNDRV_PCM_FORMAT_S24_LE,
301 SNDRV_PCM_FORMAT_S24_BE,
302 SNDRV_PCM_FORMAT_U24_LE,
303 SNDRV_PCM_FORMAT_U24_BE,
304 SNDRV_PCM_FORMAT_S32_LE,
305 SNDRV_PCM_FORMAT_S32_BE,
306 SNDRV_PCM_FORMAT_U32_LE,
307 SNDRV_PCM_FORMAT_U32_BE,
308 SNDRV_PCM_FORMAT_S8,
309 SNDRV_PCM_FORMAT_U8
310};
311
312snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
313 const struct snd_mask *format_mask)
314{
315 int i;
316
317 if (snd_mask_test(format_mask, (__force int)format))
318 return format;
319 if (!snd_pcm_plug_formats(format_mask, format))
320 return (__force snd_pcm_format_t)-EINVAL;
321 if (snd_pcm_format_linear(format)) {
322 unsigned int width = snd_pcm_format_width(format);
323 int unsignd = snd_pcm_format_unsigned(format) > 0;
324 int big = snd_pcm_format_big_endian(format) > 0;
325 unsigned int badness, best = -1;
326 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
327 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
328 snd_pcm_format_t f = preferred_formats[i];
329 unsigned int w;
330 if (!snd_mask_test(format_mask, (__force int)f))
331 continue;
332 w = snd_pcm_format_width(f);
333 if (w >= width)
334 badness = w - width;
335 else
336 badness = width - w + 32;
337 badness += snd_pcm_format_unsigned(f) != unsignd;
338 badness += snd_pcm_format_big_endian(f) != big;
339 if (badness < best) {
340 best_format = f;
341 best = badness;
342 }
343 }
344 if ((__force int)best_format >= 0)
345 return best_format;
346 else
347 return (__force snd_pcm_format_t)-EINVAL;
348 } else {
349 switch (format) {
350 case SNDRV_PCM_FORMAT_MU_LAW:
351 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
352 snd_pcm_format_t format1 = preferred_formats[i];
353 if (snd_mask_test(format_mask, (__force int)format1))
354 return format1;
355 }
356 default:
357 return (__force snd_pcm_format_t)-EINVAL;
358 }
359 }
360}
361
362int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
363 struct snd_pcm_hw_params *params,
364 struct snd_pcm_hw_params *slave_params)
365{
366 struct snd_pcm_plugin_format tmpformat;
367 struct snd_pcm_plugin_format dstformat;
368 struct snd_pcm_plugin_format srcformat;
369 snd_pcm_access_t src_access, dst_access;
370 struct snd_pcm_plugin *plugin = NULL;
371 int err;
372 int stream = snd_pcm_plug_stream(plug);
373 int slave_interleaved = (params_channels(slave_params) == 1 ||
374 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
375
376 switch (stream) {
377 case SNDRV_PCM_STREAM_PLAYBACK:
378 dstformat.format = params_format(slave_params);
379 dstformat.rate = params_rate(slave_params);
380 dstformat.channels = params_channels(slave_params);
381 srcformat.format = params_format(params);
382 srcformat.rate = params_rate(params);
383 srcformat.channels = params_channels(params);
384 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
385 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
386 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
387 break;
388 case SNDRV_PCM_STREAM_CAPTURE:
389 dstformat.format = params_format(params);
390 dstformat.rate = params_rate(params);
391 dstformat.channels = params_channels(params);
392 srcformat.format = params_format(slave_params);
393 srcformat.rate = params_rate(slave_params);
394 srcformat.channels = params_channels(slave_params);
395 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
396 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
397 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
398 break;
399 default:
400 snd_BUG();
401 return -EINVAL;
402 }
403 tmpformat = srcformat;
404
405 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
406 srcformat.format,
407 srcformat.rate,
408 srcformat.channels);
409 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
410 dstformat.format,
411 dstformat.rate,
412 dstformat.channels);
413
414 /* Format change (linearization) */
415 if (! rate_match(srcformat.rate, dstformat.rate) &&
416 ! snd_pcm_format_linear(srcformat.format)) {
417 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
418 return -EINVAL;
419 tmpformat.format = SNDRV_PCM_FORMAT_S16;
420 err = snd_pcm_plugin_build_mulaw(plug,
421 &srcformat, &tmpformat,
422 &plugin);
423 if (err < 0)
424 return err;
425 err = snd_pcm_plugin_append(plugin);
426 if (err < 0) {
427 snd_pcm_plugin_free(plugin);
428 return err;
429 }
430 srcformat = tmpformat;
431 src_access = dst_access;
432 }
433
434 /* channels reduction */
435 if (srcformat.channels > dstformat.channels) {
436 tmpformat.channels = dstformat.channels;
437 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
438 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
439 if (err < 0)
440 return err;
441 err = snd_pcm_plugin_append(plugin);
442 if (err < 0) {
443 snd_pcm_plugin_free(plugin);
444 return err;
445 }
446 srcformat = tmpformat;
447 src_access = dst_access;
448 }
449
450 /* rate resampling */
451 if (!rate_match(srcformat.rate, dstformat.rate)) {
452 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
453 /* convert to S16 for resampling */
454 tmpformat.format = SNDRV_PCM_FORMAT_S16;
455 err = snd_pcm_plugin_build_linear(plug,
456 &srcformat, &tmpformat,
457 &plugin);
458 if (err < 0)
459 return err;
460 err = snd_pcm_plugin_append(plugin);
461 if (err < 0) {
462 snd_pcm_plugin_free(plugin);
463 return err;
464 }
465 srcformat = tmpformat;
466 src_access = dst_access;
467 }
468 tmpformat.rate = dstformat.rate;
469 err = snd_pcm_plugin_build_rate(plug,
470 &srcformat, &tmpformat,
471 &plugin);
472 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
473 if (err < 0)
474 return err;
475 err = snd_pcm_plugin_append(plugin);
476 if (err < 0) {
477 snd_pcm_plugin_free(plugin);
478 return err;
479 }
480 srcformat = tmpformat;
481 src_access = dst_access;
482 }
483
484 /* format change */
485 if (srcformat.format != dstformat.format) {
486 tmpformat.format = dstformat.format;
487 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
488 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
489 err = snd_pcm_plugin_build_mulaw(plug,
490 &srcformat, &tmpformat,
491 &plugin);
492 }
493 else if (snd_pcm_format_linear(srcformat.format) &&
494 snd_pcm_format_linear(tmpformat.format)) {
495 err = snd_pcm_plugin_build_linear(plug,
496 &srcformat, &tmpformat,
497 &plugin);
498 }
499 else
500 return -EINVAL;
501 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
502 if (err < 0)
503 return err;
504 err = snd_pcm_plugin_append(plugin);
505 if (err < 0) {
506 snd_pcm_plugin_free(plugin);
507 return err;
508 }
509 srcformat = tmpformat;
510 src_access = dst_access;
511 }
512
513 /* channels extension */
514 if (srcformat.channels < dstformat.channels) {
515 tmpformat.channels = dstformat.channels;
516 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
517 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
518 if (err < 0)
519 return err;
520 err = snd_pcm_plugin_append(plugin);
521 if (err < 0) {
522 snd_pcm_plugin_free(plugin);
523 return err;
524 }
525 srcformat = tmpformat;
526 src_access = dst_access;
527 }
528
529 /* de-interleave */
530 if (src_access != dst_access) {
531 err = snd_pcm_plugin_build_copy(plug,
532 &srcformat,
533 &tmpformat,
534 &plugin);
535 pdprintf("interleave change (copy: returns %i)\n", err);
536 if (err < 0)
537 return err;
538 err = snd_pcm_plugin_append(plugin);
539 if (err < 0) {
540 snd_pcm_plugin_free(plugin);
541 return err;
542 }
543 }
544
545 return 0;
546}
547
548snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
549 char *buf,
550 snd_pcm_uframes_t count,
551 struct snd_pcm_plugin_channel **channels)
552{
553 struct snd_pcm_plugin *plugin;
554 struct snd_pcm_plugin_channel *v;
555 struct snd_pcm_plugin_format *format;
556 int width, nchannels, channel;
557 int stream = snd_pcm_plug_stream(plug);
558
559 if (snd_BUG_ON(!buf))
560 return -ENXIO;
561 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
562 plugin = snd_pcm_plug_first(plug);
563 format = &plugin->src_format;
564 } else {
565 plugin = snd_pcm_plug_last(plug);
566 format = &plugin->dst_format;
567 }
568 v = plugin->buf_channels;
569 *channels = v;
570 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
571 return width;
572 nchannels = format->channels;
573 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
574 format->channels > 1))
575 return -ENXIO;
576 for (channel = 0; channel < nchannels; channel++, v++) {
577 v->frames = count;
578 v->enabled = 1;
579 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
580 v->area.addr = buf;
581 v->area.first = channel * width;
582 v->area.step = nchannels * width;
583 }
584 return count;
585}
586
587snd_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)
588{
589 struct snd_pcm_plugin *plugin, *next;
590 struct snd_pcm_plugin_channel *dst_channels;
591 int err;
592 snd_pcm_sframes_t frames = size;
593
594 plugin = snd_pcm_plug_first(plug);
595 while (plugin) {
596 if (frames <= 0)
597 return frames;
598 if ((next = plugin->next) != NULL) {
599 snd_pcm_sframes_t frames1 = frames;
600 if (plugin->dst_frames) {
601 frames1 = plugin->dst_frames(plugin, frames);
602 if (frames1 <= 0)
603 return frames1;
604 }
605 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
606 return err;
607 }
608 if (err != frames1) {
609 frames = err;
610 if (plugin->src_frames) {
611 frames = plugin->src_frames(plugin, frames1);
612 if (frames <= 0)
613 return frames;
614 }
615 }
616 } else
617 dst_channels = NULL;
618 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
619 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
620 return frames;
621 src_channels = dst_channels;
622 plugin = next;
623 }
624 return snd_pcm_plug_client_size(plug, frames);
625}
626
627snd_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)
628{
629 struct snd_pcm_plugin *plugin, *next;
630 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
631 snd_pcm_sframes_t frames = size;
632 int err;
633
634 frames = snd_pcm_plug_slave_size(plug, frames);
635 if (frames < 0)
636 return frames;
637
638 src_channels = NULL;
639 plugin = snd_pcm_plug_first(plug);
640 while (plugin && frames > 0) {
641 if ((next = plugin->next) != NULL) {
642 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
643 return err;
644 }
645 frames = err;
646 } else {
647 dst_channels = dst_channels_final;
648 }
649 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
650 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
651 return frames;
652 plugin = next;
653 src_channels = dst_channels;
654 }
655 return frames;
656}
657
658int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
659 size_t samples, snd_pcm_format_t format)
660{
661 /* FIXME: sub byte resolution and odd dst_offset */
662 unsigned char *dst;
663 unsigned int dst_step;
664 int width;
665 const unsigned char *silence;
666 if (!dst_area->addr)
667 return 0;
668 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
669 width = snd_pcm_format_physical_width(format);
670 if (width <= 0)
671 return -EINVAL;
672 if (dst_area->step == (unsigned int) width && width >= 8)
673 return snd_pcm_format_set_silence(format, dst, samples);
674 silence = snd_pcm_format_silence_64(format);
675 if (! silence)
676 return -EINVAL;
677 dst_step = dst_area->step / 8;
678 if (width == 4) {
679 /* Ima ADPCM */
680 int dstbit = dst_area->first % 8;
681 int dstbit_step = dst_area->step % 8;
682 while (samples-- > 0) {
683 if (dstbit)
684 *dst &= 0xf0;
685 else
686 *dst &= 0x0f;
687 dst += dst_step;
688 dstbit += dstbit_step;
689 if (dstbit == 8) {
690 dst++;
691 dstbit = 0;
692 }
693 }
694 } else {
695 width /= 8;
696 while (samples-- > 0) {
697 memcpy(dst, silence, width);
698 dst += dst_step;
699 }
700 }
701 return 0;
702}
703
704int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
705 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
706 size_t samples, snd_pcm_format_t format)
707{
708 /* FIXME: sub byte resolution and odd dst_offset */
709 char *src, *dst;
710 int width;
711 int src_step, dst_step;
712 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
713 if (!src_area->addr)
714 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
715 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
716 if (!dst_area->addr)
717 return 0;
718 width = snd_pcm_format_physical_width(format);
719 if (width <= 0)
720 return -EINVAL;
721 if (src_area->step == (unsigned int) width &&
722 dst_area->step == (unsigned int) width && width >= 8) {
723 size_t bytes = samples * width / 8;
724 memcpy(dst, src, bytes);
725 return 0;
726 }
727 src_step = src_area->step / 8;
728 dst_step = dst_area->step / 8;
729 if (width == 4) {
730 /* Ima ADPCM */
731 int srcbit = src_area->first % 8;
732 int srcbit_step = src_area->step % 8;
733 int dstbit = dst_area->first % 8;
734 int dstbit_step = dst_area->step % 8;
735 while (samples-- > 0) {
736 unsigned char srcval;
737 if (srcbit)
738 srcval = *src & 0x0f;
739 else
740 srcval = (*src & 0xf0) >> 4;
741 if (dstbit)
742 *dst = (*dst & 0xf0) | srcval;
743 else
744 *dst = (*dst & 0x0f) | (srcval << 4);
745 src += src_step;
746 srcbit += srcbit_step;
747 if (srcbit == 8) {
748 src++;
749 srcbit = 0;
750 }
751 dst += dst_step;
752 dstbit += dstbit_step;
753 if (dstbit == 8) {
754 dst++;
755 dstbit = 0;
756 }
757 }
758 } else {
759 width /= 8;
760 while (samples-- > 0) {
761 memcpy(dst, src, width);
762 src += src_step;
763 dst += dst_step;
764 }
765 }
766 return 0;
767}
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 */
42static 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
49static 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 width = snd_pcm_format_physical_width(format->format);
63 if (width < 0)
64 return width;
65 size = array3_size(frames, format->channels, width);
66 /* check for too large period size once again */
67 if (size > 1024 * 1024)
68 return -ENOMEM;
69 if (snd_BUG_ON(size % 8))
70 return -ENXIO;
71 size /= 8;
72 if (plugin->buf_frames < frames) {
73 kvfree(plugin->buf);
74 plugin->buf = kvzalloc(size, GFP_KERNEL);
75 plugin->buf_frames = frames;
76 }
77 if (!plugin->buf) {
78 plugin->buf_frames = 0;
79 return -ENOMEM;
80 }
81 c = plugin->buf_channels;
82 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
83 for (channel = 0; channel < format->channels; channel++, c++) {
84 c->frames = frames;
85 c->enabled = 1;
86 c->wanted = 0;
87 c->area.addr = plugin->buf;
88 c->area.first = channel * width;
89 c->area.step = format->channels * width;
90 }
91 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
92 if (snd_BUG_ON(size % format->channels))
93 return -EINVAL;
94 size /= format->channels;
95 for (channel = 0; channel < format->channels; channel++, c++) {
96 c->frames = frames;
97 c->enabled = 1;
98 c->wanted = 0;
99 c->area.addr = plugin->buf + (channel * size);
100 c->area.first = 0;
101 c->area.step = width;
102 }
103 } else
104 return -EINVAL;
105 return 0;
106}
107
108int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
109{
110 int err;
111 if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
112 return -ENXIO;
113 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
114 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
115 while (plugin->next) {
116 if (plugin->dst_frames)
117 frames = plugin->dst_frames(plugin, frames);
118 if ((snd_pcm_sframes_t)frames <= 0)
119 return -ENXIO;
120 plugin = plugin->next;
121 err = snd_pcm_plugin_alloc(plugin, frames);
122 if (err < 0)
123 return err;
124 }
125 } else {
126 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
127 while (plugin->prev) {
128 if (plugin->src_frames)
129 frames = plugin->src_frames(plugin, frames);
130 if ((snd_pcm_sframes_t)frames <= 0)
131 return -ENXIO;
132 plugin = plugin->prev;
133 err = snd_pcm_plugin_alloc(plugin, frames);
134 if (err < 0)
135 return err;
136 }
137 }
138 return 0;
139}
140
141
142snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
143 snd_pcm_uframes_t frames,
144 struct snd_pcm_plugin_channel **channels)
145{
146 *channels = plugin->buf_channels;
147 return frames;
148}
149
150int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
151 const char *name,
152 struct snd_pcm_plugin_format *src_format,
153 struct snd_pcm_plugin_format *dst_format,
154 size_t extra,
155 struct snd_pcm_plugin **ret)
156{
157 struct snd_pcm_plugin *plugin;
158 unsigned int channels;
159
160 if (snd_BUG_ON(!plug))
161 return -ENXIO;
162 if (snd_BUG_ON(!src_format || !dst_format))
163 return -ENXIO;
164 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
165 if (plugin == NULL)
166 return -ENOMEM;
167 plugin->name = name;
168 plugin->plug = plug;
169 plugin->stream = snd_pcm_plug_stream(plug);
170 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
171 plugin->src_format = *src_format;
172 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
173 snd_BUG_ON(plugin->src_width <= 0);
174 plugin->dst_format = *dst_format;
175 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
176 snd_BUG_ON(plugin->dst_width <= 0);
177 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
178 channels = src_format->channels;
179 else
180 channels = dst_format->channels;
181 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
182 if (plugin->buf_channels == NULL) {
183 snd_pcm_plugin_free(plugin);
184 return -ENOMEM;
185 }
186 plugin->client_channels = snd_pcm_plugin_client_channels;
187 *ret = plugin;
188 return 0;
189}
190
191int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
192{
193 if (! plugin)
194 return 0;
195 if (plugin->private_free)
196 plugin->private_free(plugin);
197 kfree(plugin->buf_channels);
198 kvfree(plugin->buf);
199 kfree(plugin);
200 return 0;
201}
202
203static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
204 snd_pcm_sframes_t frames,
205 bool check_size)
206{
207 struct snd_pcm_plugin *plugin, *plugin_next;
208
209 plugin = snd_pcm_plug_first(plug);
210 while (plugin && frames > 0) {
211 plugin_next = plugin->next;
212 if (check_size && plugin->buf_frames &&
213 frames > plugin->buf_frames)
214 frames = plugin->buf_frames;
215 if (plugin->dst_frames) {
216 frames = plugin->dst_frames(plugin, frames);
217 if (frames < 0)
218 return frames;
219 }
220 plugin = plugin_next;
221 }
222 return frames;
223}
224
225static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
226 snd_pcm_sframes_t frames,
227 bool check_size)
228{
229 struct snd_pcm_plugin *plugin, *plugin_prev;
230
231 plugin = snd_pcm_plug_last(plug);
232 while (plugin && frames > 0) {
233 plugin_prev = plugin->prev;
234 if (plugin->src_frames) {
235 frames = plugin->src_frames(plugin, frames);
236 if (frames < 0)
237 return frames;
238 }
239 if (check_size && plugin->buf_frames &&
240 frames > plugin->buf_frames)
241 frames = plugin->buf_frames;
242 plugin = plugin_prev;
243 }
244 return frames;
245}
246
247snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
248{
249 if (snd_BUG_ON(!plug))
250 return -ENXIO;
251 switch (snd_pcm_plug_stream(plug)) {
252 case SNDRV_PCM_STREAM_PLAYBACK:
253 return calc_src_frames(plug, drv_frames, false);
254 case SNDRV_PCM_STREAM_CAPTURE:
255 return calc_dst_frames(plug, drv_frames, false);
256 default:
257 snd_BUG();
258 return -EINVAL;
259 }
260}
261
262snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
263{
264 if (snd_BUG_ON(!plug))
265 return -ENXIO;
266 switch (snd_pcm_plug_stream(plug)) {
267 case SNDRV_PCM_STREAM_PLAYBACK:
268 return calc_dst_frames(plug, clt_frames, false);
269 case SNDRV_PCM_STREAM_CAPTURE:
270 return calc_src_frames(plug, clt_frames, false);
271 default:
272 snd_BUG();
273 return -EINVAL;
274 }
275}
276
277static int snd_pcm_plug_formats(const struct snd_mask *mask,
278 snd_pcm_format_t format)
279{
280 struct snd_mask formats = *mask;
281 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
282 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
283 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
284 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
285 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
286 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
287 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
288 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
289 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
290 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
291
292 if (formats.bits[0] & lower_32_bits(linfmts))
293 formats.bits[0] |= lower_32_bits(linfmts);
294 if (formats.bits[1] & upper_32_bits(linfmts))
295 formats.bits[1] |= upper_32_bits(linfmts);
296 return snd_mask_test(&formats, (__force int)format);
297}
298
299static const snd_pcm_format_t preferred_formats[] = {
300 SNDRV_PCM_FORMAT_S16_LE,
301 SNDRV_PCM_FORMAT_S16_BE,
302 SNDRV_PCM_FORMAT_U16_LE,
303 SNDRV_PCM_FORMAT_U16_BE,
304 SNDRV_PCM_FORMAT_S24_3LE,
305 SNDRV_PCM_FORMAT_S24_3BE,
306 SNDRV_PCM_FORMAT_U24_3LE,
307 SNDRV_PCM_FORMAT_U24_3BE,
308 SNDRV_PCM_FORMAT_S24_LE,
309 SNDRV_PCM_FORMAT_S24_BE,
310 SNDRV_PCM_FORMAT_U24_LE,
311 SNDRV_PCM_FORMAT_U24_BE,
312 SNDRV_PCM_FORMAT_S32_LE,
313 SNDRV_PCM_FORMAT_S32_BE,
314 SNDRV_PCM_FORMAT_U32_LE,
315 SNDRV_PCM_FORMAT_U32_BE,
316 SNDRV_PCM_FORMAT_S8,
317 SNDRV_PCM_FORMAT_U8
318};
319
320snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
321 const struct snd_mask *format_mask)
322{
323 int i;
324
325 if (snd_mask_test(format_mask, (__force int)format))
326 return format;
327 if (!snd_pcm_plug_formats(format_mask, format))
328 return (__force snd_pcm_format_t)-EINVAL;
329 if (snd_pcm_format_linear(format)) {
330 unsigned int width = snd_pcm_format_width(format);
331 int unsignd = snd_pcm_format_unsigned(format) > 0;
332 int big = snd_pcm_format_big_endian(format) > 0;
333 unsigned int badness, best = -1;
334 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
335 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
336 snd_pcm_format_t f = preferred_formats[i];
337 unsigned int w;
338 if (!snd_mask_test(format_mask, (__force int)f))
339 continue;
340 w = snd_pcm_format_width(f);
341 if (w >= width)
342 badness = w - width;
343 else
344 badness = width - w + 32;
345 badness += snd_pcm_format_unsigned(f) != unsignd;
346 badness += snd_pcm_format_big_endian(f) != big;
347 if (badness < best) {
348 best_format = f;
349 best = badness;
350 }
351 }
352 if ((__force int)best_format >= 0)
353 return best_format;
354 else
355 return (__force snd_pcm_format_t)-EINVAL;
356 } else {
357 switch (format) {
358 case SNDRV_PCM_FORMAT_MU_LAW:
359 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
360 snd_pcm_format_t format1 = preferred_formats[i];
361 if (snd_mask_test(format_mask, (__force int)format1))
362 return format1;
363 }
364 fallthrough;
365 default:
366 return (__force snd_pcm_format_t)-EINVAL;
367 }
368 }
369}
370
371int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
372 struct snd_pcm_hw_params *params,
373 struct snd_pcm_hw_params *slave_params)
374{
375 struct snd_pcm_plugin_format tmpformat;
376 struct snd_pcm_plugin_format dstformat;
377 struct snd_pcm_plugin_format srcformat;
378 snd_pcm_access_t src_access, dst_access;
379 struct snd_pcm_plugin *plugin = NULL;
380 int err;
381 int stream = snd_pcm_plug_stream(plug);
382 int slave_interleaved = (params_channels(slave_params) == 1 ||
383 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
384
385 switch (stream) {
386 case SNDRV_PCM_STREAM_PLAYBACK:
387 dstformat.format = params_format(slave_params);
388 dstformat.rate = params_rate(slave_params);
389 dstformat.channels = params_channels(slave_params);
390 srcformat.format = params_format(params);
391 srcformat.rate = params_rate(params);
392 srcformat.channels = params_channels(params);
393 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
394 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
395 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
396 break;
397 case SNDRV_PCM_STREAM_CAPTURE:
398 dstformat.format = params_format(params);
399 dstformat.rate = params_rate(params);
400 dstformat.channels = params_channels(params);
401 srcformat.format = params_format(slave_params);
402 srcformat.rate = params_rate(slave_params);
403 srcformat.channels = params_channels(slave_params);
404 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
405 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
406 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
407 break;
408 default:
409 snd_BUG();
410 return -EINVAL;
411 }
412 tmpformat = srcformat;
413
414 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
415 srcformat.format,
416 srcformat.rate,
417 srcformat.channels);
418 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
419 dstformat.format,
420 dstformat.rate,
421 dstformat.channels);
422
423 /* Format change (linearization) */
424 if (! rate_match(srcformat.rate, dstformat.rate) &&
425 ! snd_pcm_format_linear(srcformat.format)) {
426 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
427 return -EINVAL;
428 tmpformat.format = SNDRV_PCM_FORMAT_S16;
429 err = snd_pcm_plugin_build_mulaw(plug,
430 &srcformat, &tmpformat,
431 &plugin);
432 if (err < 0)
433 return err;
434 err = snd_pcm_plugin_append(plugin);
435 if (err < 0) {
436 snd_pcm_plugin_free(plugin);
437 return err;
438 }
439 srcformat = tmpformat;
440 src_access = dst_access;
441 }
442
443 /* channels reduction */
444 if (srcformat.channels > dstformat.channels) {
445 tmpformat.channels = dstformat.channels;
446 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
447 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
448 if (err < 0)
449 return err;
450 err = snd_pcm_plugin_append(plugin);
451 if (err < 0) {
452 snd_pcm_plugin_free(plugin);
453 return err;
454 }
455 srcformat = tmpformat;
456 src_access = dst_access;
457 }
458
459 /* rate resampling */
460 if (!rate_match(srcformat.rate, dstformat.rate)) {
461 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
462 /* convert to S16 for resampling */
463 tmpformat.format = SNDRV_PCM_FORMAT_S16;
464 err = snd_pcm_plugin_build_linear(plug,
465 &srcformat, &tmpformat,
466 &plugin);
467 if (err < 0)
468 return err;
469 err = snd_pcm_plugin_append(plugin);
470 if (err < 0) {
471 snd_pcm_plugin_free(plugin);
472 return err;
473 }
474 srcformat = tmpformat;
475 src_access = dst_access;
476 }
477 tmpformat.rate = dstformat.rate;
478 err = snd_pcm_plugin_build_rate(plug,
479 &srcformat, &tmpformat,
480 &plugin);
481 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
482 if (err < 0)
483 return err;
484 err = snd_pcm_plugin_append(plugin);
485 if (err < 0) {
486 snd_pcm_plugin_free(plugin);
487 return err;
488 }
489 srcformat = tmpformat;
490 src_access = dst_access;
491 }
492
493 /* format change */
494 if (srcformat.format != dstformat.format) {
495 tmpformat.format = dstformat.format;
496 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
497 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
498 err = snd_pcm_plugin_build_mulaw(plug,
499 &srcformat, &tmpformat,
500 &plugin);
501 }
502 else if (snd_pcm_format_linear(srcformat.format) &&
503 snd_pcm_format_linear(tmpformat.format)) {
504 err = snd_pcm_plugin_build_linear(plug,
505 &srcformat, &tmpformat,
506 &plugin);
507 }
508 else
509 return -EINVAL;
510 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
511 if (err < 0)
512 return err;
513 err = snd_pcm_plugin_append(plugin);
514 if (err < 0) {
515 snd_pcm_plugin_free(plugin);
516 return err;
517 }
518 srcformat = tmpformat;
519 src_access = dst_access;
520 }
521
522 /* channels extension */
523 if (srcformat.channels < dstformat.channels) {
524 tmpformat.channels = dstformat.channels;
525 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
526 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
527 if (err < 0)
528 return err;
529 err = snd_pcm_plugin_append(plugin);
530 if (err < 0) {
531 snd_pcm_plugin_free(plugin);
532 return err;
533 }
534 srcformat = tmpformat;
535 src_access = dst_access;
536 }
537
538 /* de-interleave */
539 if (src_access != dst_access) {
540 err = snd_pcm_plugin_build_copy(plug,
541 &srcformat,
542 &tmpformat,
543 &plugin);
544 pdprintf("interleave change (copy: returns %i)\n", err);
545 if (err < 0)
546 return err;
547 err = snd_pcm_plugin_append(plugin);
548 if (err < 0) {
549 snd_pcm_plugin_free(plugin);
550 return err;
551 }
552 }
553
554 return 0;
555}
556
557snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
558 char *buf,
559 snd_pcm_uframes_t count,
560 struct snd_pcm_plugin_channel **channels)
561{
562 struct snd_pcm_plugin *plugin;
563 struct snd_pcm_plugin_channel *v;
564 struct snd_pcm_plugin_format *format;
565 int width, nchannels, channel;
566 int stream = snd_pcm_plug_stream(plug);
567
568 if (snd_BUG_ON(!buf))
569 return -ENXIO;
570 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
571 plugin = snd_pcm_plug_first(plug);
572 format = &plugin->src_format;
573 } else {
574 plugin = snd_pcm_plug_last(plug);
575 format = &plugin->dst_format;
576 }
577 v = plugin->buf_channels;
578 *channels = v;
579 width = snd_pcm_format_physical_width(format->format);
580 if (width < 0)
581 return width;
582 nchannels = format->channels;
583 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
584 format->channels > 1))
585 return -ENXIO;
586 for (channel = 0; channel < nchannels; channel++, v++) {
587 v->frames = count;
588 v->enabled = 1;
589 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
590 v->area.addr = buf;
591 v->area.first = channel * width;
592 v->area.step = nchannels * width;
593 }
594 return count;
595}
596
597snd_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)
598{
599 struct snd_pcm_plugin *plugin, *next;
600 struct snd_pcm_plugin_channel *dst_channels;
601 int err;
602 snd_pcm_sframes_t frames = size;
603
604 plugin = snd_pcm_plug_first(plug);
605 while (plugin) {
606 if (frames <= 0)
607 return frames;
608 next = plugin->next;
609 if (next) {
610 snd_pcm_sframes_t frames1 = frames;
611 if (plugin->dst_frames) {
612 frames1 = plugin->dst_frames(plugin, frames);
613 if (frames1 <= 0)
614 return frames1;
615 }
616 err = next->client_channels(next, frames1, &dst_channels);
617 if (err < 0)
618 return err;
619 if (err != frames1) {
620 frames = err;
621 if (plugin->src_frames) {
622 frames = plugin->src_frames(plugin, frames1);
623 if (frames <= 0)
624 return frames;
625 }
626 }
627 } else
628 dst_channels = NULL;
629 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
630 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
631 if (frames < 0)
632 return frames;
633 src_channels = dst_channels;
634 plugin = next;
635 }
636 return calc_src_frames(plug, frames, true);
637}
638
639snd_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)
640{
641 struct snd_pcm_plugin *plugin, *next;
642 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
643 snd_pcm_sframes_t frames = size;
644 int err;
645
646 frames = calc_src_frames(plug, frames, true);
647 if (frames < 0)
648 return frames;
649
650 src_channels = NULL;
651 plugin = snd_pcm_plug_first(plug);
652 while (plugin && frames > 0) {
653 next = plugin->next;
654 if (next) {
655 err = plugin->client_channels(plugin, frames, &dst_channels);
656 if (err < 0)
657 return err;
658 frames = err;
659 } else {
660 dst_channels = dst_channels_final;
661 }
662 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
663 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
664 if (frames < 0)
665 return frames;
666 plugin = next;
667 src_channels = dst_channels;
668 }
669 return frames;
670}
671
672int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
673 size_t samples, snd_pcm_format_t format)
674{
675 /* FIXME: sub byte resolution and odd dst_offset */
676 unsigned char *dst;
677 unsigned int dst_step;
678 int width;
679 const unsigned char *silence;
680 if (!dst_area->addr)
681 return 0;
682 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
683 width = snd_pcm_format_physical_width(format);
684 if (width <= 0)
685 return -EINVAL;
686 if (dst_area->step == (unsigned int) width && width >= 8)
687 return snd_pcm_format_set_silence(format, dst, samples);
688 silence = snd_pcm_format_silence_64(format);
689 if (! silence)
690 return -EINVAL;
691 dst_step = dst_area->step / 8;
692 if (width == 4) {
693 /* Ima ADPCM */
694 int dstbit = dst_area->first % 8;
695 int dstbit_step = dst_area->step % 8;
696 while (samples-- > 0) {
697 if (dstbit)
698 *dst &= 0xf0;
699 else
700 *dst &= 0x0f;
701 dst += dst_step;
702 dstbit += dstbit_step;
703 if (dstbit == 8) {
704 dst++;
705 dstbit = 0;
706 }
707 }
708 } else {
709 width /= 8;
710 while (samples-- > 0) {
711 memcpy(dst, silence, width);
712 dst += dst_step;
713 }
714 }
715 return 0;
716}
717
718int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
719 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
720 size_t samples, snd_pcm_format_t format)
721{
722 /* FIXME: sub byte resolution and odd dst_offset */
723 char *src, *dst;
724 int width;
725 int src_step, dst_step;
726 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
727 if (!src_area->addr)
728 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
729 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
730 if (!dst_area->addr)
731 return 0;
732 width = snd_pcm_format_physical_width(format);
733 if (width <= 0)
734 return -EINVAL;
735 if (src_area->step == (unsigned int) width &&
736 dst_area->step == (unsigned int) width && width >= 8) {
737 size_t bytes = samples * width / 8;
738 memcpy(dst, src, bytes);
739 return 0;
740 }
741 src_step = src_area->step / 8;
742 dst_step = dst_area->step / 8;
743 if (width == 4) {
744 /* Ima ADPCM */
745 int srcbit = src_area->first % 8;
746 int srcbit_step = src_area->step % 8;
747 int dstbit = dst_area->first % 8;
748 int dstbit_step = dst_area->step % 8;
749 while (samples-- > 0) {
750 unsigned char srcval;
751 if (srcbit)
752 srcval = *src & 0x0f;
753 else
754 srcval = (*src & 0xf0) >> 4;
755 if (dstbit)
756 *dst = (*dst & 0xf0) | srcval;
757 else
758 *dst = (*dst & 0x0f) | (srcval << 4);
759 src += src_step;
760 srcbit += srcbit_step;
761 if (srcbit == 8) {
762 src++;
763 srcbit = 0;
764 }
765 dst += dst_step;
766 dstbit += dstbit_step;
767 if (dstbit == 8) {
768 dst++;
769 dstbit = 0;
770 }
771 }
772 } else {
773 width /= 8;
774 while (samples-- > 0) {
775 memcpy(dst, src, width);
776 src += src_step;
777 dst += dst_step;
778 }
779 }
780 return 0;
781}