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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
40
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 = frames * format->channels * width;
66 if (snd_BUG_ON(size % 8))
67 return -ENXIO;
68 size /= 8;
69 if (plugin->buf_frames < frames) {
70 kvfree(plugin->buf);
71 plugin->buf = kvzalloc(size, GFP_KERNEL);
72 plugin->buf_frames = frames;
73 }
74 if (!plugin->buf) {
75 plugin->buf_frames = 0;
76 return -ENOMEM;
77 }
78 c = plugin->buf_channels;
79 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
80 for (channel = 0; channel < format->channels; channel++, c++) {
81 c->frames = frames;
82 c->enabled = 1;
83 c->wanted = 0;
84 c->area.addr = plugin->buf;
85 c->area.first = channel * width;
86 c->area.step = format->channels * width;
87 }
88 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
89 if (snd_BUG_ON(size % format->channels))
90 return -EINVAL;
91 size /= format->channels;
92 for (channel = 0; channel < format->channels; channel++, c++) {
93 c->frames = frames;
94 c->enabled = 1;
95 c->wanted = 0;
96 c->area.addr = plugin->buf + (channel * size);
97 c->area.first = 0;
98 c->area.step = width;
99 }
100 } else
101 return -EINVAL;
102 return 0;
103}
104
105int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
106{
107 int err;
108 if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
109 return -ENXIO;
110 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
111 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
112 while (plugin->next) {
113 if (plugin->dst_frames)
114 frames = plugin->dst_frames(plugin, frames);
115 if ((snd_pcm_sframes_t)frames <= 0)
116 return -ENXIO;
117 plugin = plugin->next;
118 err = snd_pcm_plugin_alloc(plugin, frames);
119 if (err < 0)
120 return err;
121 }
122 } else {
123 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
124 while (plugin->prev) {
125 if (plugin->src_frames)
126 frames = plugin->src_frames(plugin, frames);
127 if ((snd_pcm_sframes_t)frames <= 0)
128 return -ENXIO;
129 plugin = plugin->prev;
130 err = snd_pcm_plugin_alloc(plugin, frames);
131 if (err < 0)
132 return err;
133 }
134 }
135 return 0;
136}
137
138
139snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
140 snd_pcm_uframes_t frames,
141 struct snd_pcm_plugin_channel **channels)
142{
143 *channels = plugin->buf_channels;
144 return frames;
145}
146
147int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
148 const char *name,
149 struct snd_pcm_plugin_format *src_format,
150 struct snd_pcm_plugin_format *dst_format,
151 size_t extra,
152 struct snd_pcm_plugin **ret)
153{
154 struct snd_pcm_plugin *plugin;
155 unsigned int channels;
156
157 if (snd_BUG_ON(!plug))
158 return -ENXIO;
159 if (snd_BUG_ON(!src_format || !dst_format))
160 return -ENXIO;
161 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
162 if (plugin == NULL)
163 return -ENOMEM;
164 plugin->name = name;
165 plugin->plug = plug;
166 plugin->stream = snd_pcm_plug_stream(plug);
167 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
168 plugin->src_format = *src_format;
169 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
170 snd_BUG_ON(plugin->src_width <= 0);
171 plugin->dst_format = *dst_format;
172 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
173 snd_BUG_ON(plugin->dst_width <= 0);
174 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
175 channels = src_format->channels;
176 else
177 channels = dst_format->channels;
178 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
179 if (plugin->buf_channels == NULL) {
180 snd_pcm_plugin_free(plugin);
181 return -ENOMEM;
182 }
183 plugin->client_channels = snd_pcm_plugin_client_channels;
184 *ret = plugin;
185 return 0;
186}
187
188int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
189{
190 if (! plugin)
191 return 0;
192 if (plugin->private_free)
193 plugin->private_free(plugin);
194 kfree(plugin->buf_channels);
195 kvfree(plugin->buf);
196 kfree(plugin);
197 return 0;
198}
199
200static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
201 snd_pcm_sframes_t frames,
202 bool check_size)
203{
204 struct snd_pcm_plugin *plugin, *plugin_next;
205
206 plugin = snd_pcm_plug_first(plug);
207 while (plugin && frames > 0) {
208 plugin_next = plugin->next;
209 if (check_size && plugin->buf_frames &&
210 frames > plugin->buf_frames)
211 frames = plugin->buf_frames;
212 if (plugin->dst_frames) {
213 frames = plugin->dst_frames(plugin, frames);
214 if (frames < 0)
215 return frames;
216 }
217 plugin = plugin_next;
218 }
219 return frames;
220}
221
222static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
223 snd_pcm_sframes_t frames,
224 bool check_size)
225{
226 struct snd_pcm_plugin *plugin, *plugin_prev;
227
228 plugin = snd_pcm_plug_last(plug);
229 while (plugin && frames > 0) {
230 plugin_prev = plugin->prev;
231 if (plugin->src_frames) {
232 frames = plugin->src_frames(plugin, frames);
233 if (frames < 0)
234 return frames;
235 }
236 if (check_size && plugin->buf_frames &&
237 frames > plugin->buf_frames)
238 frames = plugin->buf_frames;
239 plugin = plugin_prev;
240 }
241 return frames;
242}
243
244snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
245{
246 if (snd_BUG_ON(!plug))
247 return -ENXIO;
248 switch (snd_pcm_plug_stream(plug)) {
249 case SNDRV_PCM_STREAM_PLAYBACK:
250 return calc_src_frames(plug, drv_frames, false);
251 case SNDRV_PCM_STREAM_CAPTURE:
252 return calc_dst_frames(plug, drv_frames, false);
253 default:
254 snd_BUG();
255 return -EINVAL;
256 }
257}
258
259snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
260{
261 if (snd_BUG_ON(!plug))
262 return -ENXIO;
263 switch (snd_pcm_plug_stream(plug)) {
264 case SNDRV_PCM_STREAM_PLAYBACK:
265 return calc_dst_frames(plug, clt_frames, false);
266 case SNDRV_PCM_STREAM_CAPTURE:
267 return calc_src_frames(plug, clt_frames, false);
268 default:
269 snd_BUG();
270 return -EINVAL;
271 }
272}
273
274static int snd_pcm_plug_formats(const struct snd_mask *mask,
275 snd_pcm_format_t format)
276{
277 struct snd_mask formats = *mask;
278 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
279 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
280 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
281 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
282 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
283 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
284 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
285 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
286 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
287 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
288
289 if (formats.bits[0] & lower_32_bits(linfmts))
290 formats.bits[0] |= lower_32_bits(linfmts);
291 if (formats.bits[1] & upper_32_bits(linfmts))
292 formats.bits[1] |= upper_32_bits(linfmts);
293 return snd_mask_test(&formats, (__force int)format);
294}
295
296static const snd_pcm_format_t preferred_formats[] = {
297 SNDRV_PCM_FORMAT_S16_LE,
298 SNDRV_PCM_FORMAT_S16_BE,
299 SNDRV_PCM_FORMAT_U16_LE,
300 SNDRV_PCM_FORMAT_U16_BE,
301 SNDRV_PCM_FORMAT_S24_3LE,
302 SNDRV_PCM_FORMAT_S24_3BE,
303 SNDRV_PCM_FORMAT_U24_3LE,
304 SNDRV_PCM_FORMAT_U24_3BE,
305 SNDRV_PCM_FORMAT_S24_LE,
306 SNDRV_PCM_FORMAT_S24_BE,
307 SNDRV_PCM_FORMAT_U24_LE,
308 SNDRV_PCM_FORMAT_U24_BE,
309 SNDRV_PCM_FORMAT_S32_LE,
310 SNDRV_PCM_FORMAT_S32_BE,
311 SNDRV_PCM_FORMAT_U32_LE,
312 SNDRV_PCM_FORMAT_U32_BE,
313 SNDRV_PCM_FORMAT_S8,
314 SNDRV_PCM_FORMAT_U8
315};
316
317snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
318 const struct snd_mask *format_mask)
319{
320 int i;
321
322 if (snd_mask_test(format_mask, (__force int)format))
323 return format;
324 if (!snd_pcm_plug_formats(format_mask, format))
325 return (__force snd_pcm_format_t)-EINVAL;
326 if (snd_pcm_format_linear(format)) {
327 unsigned int width = snd_pcm_format_width(format);
328 int unsignd = snd_pcm_format_unsigned(format) > 0;
329 int big = snd_pcm_format_big_endian(format) > 0;
330 unsigned int badness, best = -1;
331 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
332 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
333 snd_pcm_format_t f = preferred_formats[i];
334 unsigned int w;
335 if (!snd_mask_test(format_mask, (__force int)f))
336 continue;
337 w = snd_pcm_format_width(f);
338 if (w >= width)
339 badness = w - width;
340 else
341 badness = width - w + 32;
342 badness += snd_pcm_format_unsigned(f) != unsignd;
343 badness += snd_pcm_format_big_endian(f) != big;
344 if (badness < best) {
345 best_format = f;
346 best = badness;
347 }
348 }
349 if ((__force int)best_format >= 0)
350 return best_format;
351 else
352 return (__force snd_pcm_format_t)-EINVAL;
353 } else {
354 switch (format) {
355 case SNDRV_PCM_FORMAT_MU_LAW:
356 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
357 snd_pcm_format_t format1 = preferred_formats[i];
358 if (snd_mask_test(format_mask, (__force int)format1))
359 return format1;
360 }
361 fallthrough;
362 default:
363 return (__force snd_pcm_format_t)-EINVAL;
364 }
365 }
366}
367
368int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
369 struct snd_pcm_hw_params *params,
370 struct snd_pcm_hw_params *slave_params)
371{
372 struct snd_pcm_plugin_format tmpformat;
373 struct snd_pcm_plugin_format dstformat;
374 struct snd_pcm_plugin_format srcformat;
375 snd_pcm_access_t src_access, dst_access;
376 struct snd_pcm_plugin *plugin = NULL;
377 int err;
378 int stream = snd_pcm_plug_stream(plug);
379 int slave_interleaved = (params_channels(slave_params) == 1 ||
380 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
381
382 switch (stream) {
383 case SNDRV_PCM_STREAM_PLAYBACK:
384 dstformat.format = params_format(slave_params);
385 dstformat.rate = params_rate(slave_params);
386 dstformat.channels = params_channels(slave_params);
387 srcformat.format = params_format(params);
388 srcformat.rate = params_rate(params);
389 srcformat.channels = params_channels(params);
390 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
391 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
392 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
393 break;
394 case SNDRV_PCM_STREAM_CAPTURE:
395 dstformat.format = params_format(params);
396 dstformat.rate = params_rate(params);
397 dstformat.channels = params_channels(params);
398 srcformat.format = params_format(slave_params);
399 srcformat.rate = params_rate(slave_params);
400 srcformat.channels = params_channels(slave_params);
401 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
402 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
403 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
404 break;
405 default:
406 snd_BUG();
407 return -EINVAL;
408 }
409 tmpformat = srcformat;
410
411 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
412 srcformat.format,
413 srcformat.rate,
414 srcformat.channels);
415 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
416 dstformat.format,
417 dstformat.rate,
418 dstformat.channels);
419
420
421 if (! rate_match(srcformat.rate, dstformat.rate) &&
422 ! snd_pcm_format_linear(srcformat.format)) {
423 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
424 return -EINVAL;
425 tmpformat.format = SNDRV_PCM_FORMAT_S16;
426 err = snd_pcm_plugin_build_mulaw(plug,
427 &srcformat, &tmpformat,
428 &plugin);
429 if (err < 0)
430 return err;
431 err = snd_pcm_plugin_append(plugin);
432 if (err < 0) {
433 snd_pcm_plugin_free(plugin);
434 return err;
435 }
436 srcformat = tmpformat;
437 src_access = dst_access;
438 }
439
440
441 if (srcformat.channels > dstformat.channels) {
442 tmpformat.channels = dstformat.channels;
443 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
444 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
445 if (err < 0)
446 return err;
447 err = snd_pcm_plugin_append(plugin);
448 if (err < 0) {
449 snd_pcm_plugin_free(plugin);
450 return err;
451 }
452 srcformat = tmpformat;
453 src_access = dst_access;
454 }
455
456
457 if (!rate_match(srcformat.rate, dstformat.rate)) {
458 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
459
460 tmpformat.format = SNDRV_PCM_FORMAT_S16;
461 err = snd_pcm_plugin_build_linear(plug,
462 &srcformat, &tmpformat,
463 &plugin);
464 if (err < 0)
465 return err;
466 err = snd_pcm_plugin_append(plugin);
467 if (err < 0) {
468 snd_pcm_plugin_free(plugin);
469 return err;
470 }
471 srcformat = tmpformat;
472 src_access = dst_access;
473 }
474 tmpformat.rate = dstformat.rate;
475 err = snd_pcm_plugin_build_rate(plug,
476 &srcformat, &tmpformat,
477 &plugin);
478 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
479 if (err < 0)
480 return err;
481 err = snd_pcm_plugin_append(plugin);
482 if (err < 0) {
483 snd_pcm_plugin_free(plugin);
484 return err;
485 }
486 srcformat = tmpformat;
487 src_access = dst_access;
488 }
489
490
491 if (srcformat.format != dstformat.format) {
492 tmpformat.format = dstformat.format;
493 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
494 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
495 err = snd_pcm_plugin_build_mulaw(plug,
496 &srcformat, &tmpformat,
497 &plugin);
498 }
499 else if (snd_pcm_format_linear(srcformat.format) &&
500 snd_pcm_format_linear(tmpformat.format)) {
501 err = snd_pcm_plugin_build_linear(plug,
502 &srcformat, &tmpformat,
503 &plugin);
504 }
505 else
506 return -EINVAL;
507 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
508 if (err < 0)
509 return err;
510 err = snd_pcm_plugin_append(plugin);
511 if (err < 0) {
512 snd_pcm_plugin_free(plugin);
513 return err;
514 }
515 srcformat = tmpformat;
516 src_access = dst_access;
517 }
518
519
520 if (srcformat.channels < dstformat.channels) {
521 tmpformat.channels = dstformat.channels;
522 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
523 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
524 if (err < 0)
525 return err;
526 err = snd_pcm_plugin_append(plugin);
527 if (err < 0) {
528 snd_pcm_plugin_free(plugin);
529 return err;
530 }
531 srcformat = tmpformat;
532 src_access = dst_access;
533 }
534
535
536 if (src_access != dst_access) {
537 err = snd_pcm_plugin_build_copy(plug,
538 &srcformat,
539 &tmpformat,
540 &plugin);
541 pdprintf("interleave change (copy: returns %i)\n", err);
542 if (err < 0)
543 return err;
544 err = snd_pcm_plugin_append(plugin);
545 if (err < 0) {
546 snd_pcm_plugin_free(plugin);
547 return err;
548 }
549 }
550
551 return 0;
552}
553
554snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
555 char *buf,
556 snd_pcm_uframes_t count,
557 struct snd_pcm_plugin_channel **channels)
558{
559 struct snd_pcm_plugin *plugin;
560 struct snd_pcm_plugin_channel *v;
561 struct snd_pcm_plugin_format *format;
562 int width, nchannels, channel;
563 int stream = snd_pcm_plug_stream(plug);
564
565 if (snd_BUG_ON(!buf))
566 return -ENXIO;
567 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
568 plugin = snd_pcm_plug_first(plug);
569 format = &plugin->src_format;
570 } else {
571 plugin = snd_pcm_plug_last(plug);
572 format = &plugin->dst_format;
573 }
574 v = plugin->buf_channels;
575 *channels = v;
576 width = snd_pcm_format_physical_width(format->format);
577 if (width < 0)
578 return width;
579 nchannels = format->channels;
580 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
581 format->channels > 1))
582 return -ENXIO;
583 for (channel = 0; channel < nchannels; channel++, v++) {
584 v->frames = count;
585 v->enabled = 1;
586 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
587 v->area.addr = buf;
588 v->area.first = channel * width;
589 v->area.step = nchannels * width;
590 }
591 return count;
592}
593
594snd_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)
595{
596 struct snd_pcm_plugin *plugin, *next;
597 struct snd_pcm_plugin_channel *dst_channels;
598 int err;
599 snd_pcm_sframes_t frames = size;
600
601 plugin = snd_pcm_plug_first(plug);
602 while (plugin) {
603 if (frames <= 0)
604 return frames;
605 next = plugin->next;
606 if (next) {
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 err = next->client_channels(next, frames1, &dst_channels);
614 if (err < 0)
615 return err;
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 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
628 if (frames < 0)
629 return frames;
630 src_channels = dst_channels;
631 plugin = next;
632 }
633 return calc_src_frames(plug, frames, true);
634}
635
636snd_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)
637{
638 struct snd_pcm_plugin *plugin, *next;
639 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
640 snd_pcm_sframes_t frames = size;
641 int err;
642
643 frames = calc_src_frames(plug, frames, true);
644 if (frames < 0)
645 return frames;
646
647 src_channels = NULL;
648 plugin = snd_pcm_plug_first(plug);
649 while (plugin && frames > 0) {
650 next = plugin->next;
651 if (next) {
652 err = plugin->client_channels(plugin, frames, &dst_channels);
653 if (err < 0)
654 return err;
655 frames = err;
656 } else {
657 dst_channels = dst_channels_final;
658 }
659 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
660 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
661 if (frames < 0)
662 return frames;
663 plugin = next;
664 src_channels = dst_channels;
665 }
666 return frames;
667}
668
669int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
670 size_t samples, snd_pcm_format_t format)
671{
672
673 unsigned char *dst;
674 unsigned int dst_step;
675 int width;
676 const unsigned char *silence;
677 if (!dst_area->addr)
678 return 0;
679 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
680 width = snd_pcm_format_physical_width(format);
681 if (width <= 0)
682 return -EINVAL;
683 if (dst_area->step == (unsigned int) width && width >= 8)
684 return snd_pcm_format_set_silence(format, dst, samples);
685 silence = snd_pcm_format_silence_64(format);
686 if (! silence)
687 return -EINVAL;
688 dst_step = dst_area->step / 8;
689 if (width == 4) {
690
691 int dstbit = dst_area->first % 8;
692 int dstbit_step = dst_area->step % 8;
693 while (samples-- > 0) {
694 if (dstbit)
695 *dst &= 0xf0;
696 else
697 *dst &= 0x0f;
698 dst += dst_step;
699 dstbit += dstbit_step;
700 if (dstbit == 8) {
701 dst++;
702 dstbit = 0;
703 }
704 }
705 } else {
706 width /= 8;
707 while (samples-- > 0) {
708 memcpy(dst, silence, width);
709 dst += dst_step;
710 }
711 }
712 return 0;
713}
714
715int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
716 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
717 size_t samples, snd_pcm_format_t format)
718{
719
720 char *src, *dst;
721 int width;
722 int src_step, dst_step;
723 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
724 if (!src_area->addr)
725 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
726 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
727 if (!dst_area->addr)
728 return 0;
729 width = snd_pcm_format_physical_width(format);
730 if (width <= 0)
731 return -EINVAL;
732 if (src_area->step == (unsigned int) width &&
733 dst_area->step == (unsigned int) width && width >= 8) {
734 size_t bytes = samples * width / 8;
735 memcpy(dst, src, bytes);
736 return 0;
737 }
738 src_step = src_area->step / 8;
739 dst_step = dst_area->step / 8;
740 if (width == 4) {
741
742 int srcbit = src_area->first % 8;
743 int srcbit_step = src_area->step % 8;
744 int dstbit = dst_area->first % 8;
745 int dstbit_step = dst_area->step % 8;
746 while (samples-- > 0) {
747 unsigned char srcval;
748 if (srcbit)
749 srcval = *src & 0x0f;
750 else
751 srcval = (*src & 0xf0) >> 4;
752 if (dstbit)
753 *dst = (*dst & 0xf0) | srcval;
754 else
755 *dst = (*dst & 0x0f) | (srcval << 4);
756 src += src_step;
757 srcbit += srcbit_step;
758 if (srcbit == 8) {
759 src++;
760 srcbit = 0;
761 }
762 dst += dst_step;
763 dstbit += dstbit_step;
764 if (dstbit == 8) {
765 dst++;
766 dstbit = 0;
767 }
768 }
769 } else {
770 width /= 8;
771 while (samples-- > 0) {
772 memcpy(dst, src, width);
773 src += src_step;
774 dst += dst_step;
775 }
776 }
777 return 0;
778}
779
