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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 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(struct snd_mask *mask, snd_pcm_format_t format)
270{
271 struct snd_mask formats = *mask;
272 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
273 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
274 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
275 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
276 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
277 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
278 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
279 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
280 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
281 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
282
283 if (formats.bits[0] & (u32)linfmts)
284 formats.bits[0] |= (u32)linfmts;
285 if (formats.bits[1] & (u32)(linfmts >> 32))
286 formats.bits[1] |= (u32)(linfmts >> 32);
287 return snd_mask_test(&formats, (__force int)format);
288}
289
290static snd_pcm_format_t preferred_formats[] = {
291 SNDRV_PCM_FORMAT_S16_LE,
292 SNDRV_PCM_FORMAT_S16_BE,
293 SNDRV_PCM_FORMAT_U16_LE,
294 SNDRV_PCM_FORMAT_U16_BE,
295 SNDRV_PCM_FORMAT_S24_3LE,
296 SNDRV_PCM_FORMAT_S24_3BE,
297 SNDRV_PCM_FORMAT_U24_3LE,
298 SNDRV_PCM_FORMAT_U24_3BE,
299 SNDRV_PCM_FORMAT_S24_LE,
300 SNDRV_PCM_FORMAT_S24_BE,
301 SNDRV_PCM_FORMAT_U24_LE,
302 SNDRV_PCM_FORMAT_U24_BE,
303 SNDRV_PCM_FORMAT_S32_LE,
304 SNDRV_PCM_FORMAT_S32_BE,
305 SNDRV_PCM_FORMAT_U32_LE,
306 SNDRV_PCM_FORMAT_U32_BE,
307 SNDRV_PCM_FORMAT_S8,
308 SNDRV_PCM_FORMAT_U8
309};
310
311snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
312 struct snd_mask *format_mask)
313{
314 int i;
315
316 if (snd_mask_test(format_mask, (__force int)format))
317 return format;
318 if (!snd_pcm_plug_formats(format_mask, format))
319 return (__force snd_pcm_format_t)-EINVAL;
320 if (snd_pcm_format_linear(format)) {
321 unsigned int width = snd_pcm_format_width(format);
322 int unsignd = snd_pcm_format_unsigned(format) > 0;
323 int big = snd_pcm_format_big_endian(format) > 0;
324 unsigned int badness, best = -1;
325 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
326 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
327 snd_pcm_format_t f = preferred_formats[i];
328 unsigned int w;
329 if (!snd_mask_test(format_mask, (__force int)f))
330 continue;
331 w = snd_pcm_format_width(f);
332 if (w >= width)
333 badness = w - width;
334 else
335 badness = width - w + 32;
336 badness += snd_pcm_format_unsigned(f) != unsignd;
337 badness += snd_pcm_format_big_endian(f) != big;
338 if (badness < best) {
339 best_format = f;
340 best = badness;
341 }
342 }
343 if ((__force int)best_format >= 0)
344 return best_format;
345 else
346 return (__force snd_pcm_format_t)-EINVAL;
347 } else {
348 switch (format) {
349 case SNDRV_PCM_FORMAT_MU_LAW:
350 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
351 snd_pcm_format_t format1 = preferred_formats[i];
352 if (snd_mask_test(format_mask, (__force int)format1))
353 return format1;
354 }
355 default:
356 return (__force snd_pcm_format_t)-EINVAL;
357 }
358 }
359}
360
361int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
362 struct snd_pcm_hw_params *params,
363 struct snd_pcm_hw_params *slave_params)
364{
365 struct snd_pcm_plugin_format tmpformat;
366 struct snd_pcm_plugin_format dstformat;
367 struct snd_pcm_plugin_format srcformat;
368 snd_pcm_access_t src_access, dst_access;
369 struct snd_pcm_plugin *plugin = NULL;
370 int err;
371 int stream = snd_pcm_plug_stream(plug);
372 int slave_interleaved = (params_channels(slave_params) == 1 ||
373 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
374
375 switch (stream) {
376 case SNDRV_PCM_STREAM_PLAYBACK:
377 dstformat.format = params_format(slave_params);
378 dstformat.rate = params_rate(slave_params);
379 dstformat.channels = params_channels(slave_params);
380 srcformat.format = params_format(params);
381 srcformat.rate = params_rate(params);
382 srcformat.channels = params_channels(params);
383 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
384 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
385 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
386 break;
387 case SNDRV_PCM_STREAM_CAPTURE:
388 dstformat.format = params_format(params);
389 dstformat.rate = params_rate(params);
390 dstformat.channels = params_channels(params);
391 srcformat.format = params_format(slave_params);
392 srcformat.rate = params_rate(slave_params);
393 srcformat.channels = params_channels(slave_params);
394 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
395 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
396 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
397 break;
398 default:
399 snd_BUG();
400 return -EINVAL;
401 }
402 tmpformat = srcformat;
403
404 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
405 srcformat.format,
406 srcformat.rate,
407 srcformat.channels);
408 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
409 dstformat.format,
410 dstformat.rate,
411 dstformat.channels);
412
413
414 if (! rate_match(srcformat.rate, dstformat.rate) &&
415 ! snd_pcm_format_linear(srcformat.format)) {
416 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
417 return -EINVAL;
418 tmpformat.format = SNDRV_PCM_FORMAT_S16;
419 err = snd_pcm_plugin_build_mulaw(plug,
420 &srcformat, &tmpformat,
421 &plugin);
422 if (err < 0)
423 return err;
424 err = snd_pcm_plugin_append(plugin);
425 if (err < 0) {
426 snd_pcm_plugin_free(plugin);
427 return err;
428 }
429 srcformat = tmpformat;
430 src_access = dst_access;
431 }
432
433
434 if (srcformat.channels > dstformat.channels) {
435 tmpformat.channels = dstformat.channels;
436 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
437 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
438 if (err < 0)
439 return err;
440 err = snd_pcm_plugin_append(plugin);
441 if (err < 0) {
442 snd_pcm_plugin_free(plugin);
443 return err;
444 }
445 srcformat = tmpformat;
446 src_access = dst_access;
447 }
448
449
450 if (!rate_match(srcformat.rate, dstformat.rate)) {
451 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
452
453 tmpformat.format = SNDRV_PCM_FORMAT_S16;
454 err = snd_pcm_plugin_build_linear(plug,
455 &srcformat, &tmpformat,
456 &plugin);
457 if (err < 0)
458 return err;
459 err = snd_pcm_plugin_append(plugin);
460 if (err < 0) {
461 snd_pcm_plugin_free(plugin);
462 return err;
463 }
464 srcformat = tmpformat;
465 src_access = dst_access;
466 }
467 tmpformat.rate = dstformat.rate;
468 err = snd_pcm_plugin_build_rate(plug,
469 &srcformat, &tmpformat,
470 &plugin);
471 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
472 if (err < 0)
473 return err;
474 err = snd_pcm_plugin_append(plugin);
475 if (err < 0) {
476 snd_pcm_plugin_free(plugin);
477 return err;
478 }
479 srcformat = tmpformat;
480 src_access = dst_access;
481 }
482
483
484 if (srcformat.format != dstformat.format) {
485 tmpformat.format = dstformat.format;
486 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
487 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
488 err = snd_pcm_plugin_build_mulaw(plug,
489 &srcformat, &tmpformat,
490 &plugin);
491 }
492 else if (snd_pcm_format_linear(srcformat.format) &&
493 snd_pcm_format_linear(tmpformat.format)) {
494 err = snd_pcm_plugin_build_linear(plug,
495 &srcformat, &tmpformat,
496 &plugin);
497 }
498 else
499 return -EINVAL;
500 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
501 if (err < 0)
502 return err;
503 err = snd_pcm_plugin_append(plugin);
504 if (err < 0) {
505 snd_pcm_plugin_free(plugin);
506 return err;
507 }
508 srcformat = tmpformat;
509 src_access = dst_access;
510 }
511
512
513 if (srcformat.channels < dstformat.channels) {
514 tmpformat.channels = dstformat.channels;
515 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
516 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
517 if (err < 0)
518 return err;
519 err = snd_pcm_plugin_append(plugin);
520 if (err < 0) {
521 snd_pcm_plugin_free(plugin);
522 return err;
523 }
524 srcformat = tmpformat;
525 src_access = dst_access;
526 }
527
528
529 if (src_access != dst_access) {
530 err = snd_pcm_plugin_build_copy(plug,
531 &srcformat,
532 &tmpformat,
533 &plugin);
534 pdprintf("interleave change (copy: returns %i)\n", err);
535 if (err < 0)
536 return err;
537 err = snd_pcm_plugin_append(plugin);
538 if (err < 0) {
539 snd_pcm_plugin_free(plugin);
540 return err;
541 }
542 }
543
544 return 0;
545}
546
547snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
548 char *buf,
549 snd_pcm_uframes_t count,
550 struct snd_pcm_plugin_channel **channels)
551{
552 struct snd_pcm_plugin *plugin;
553 struct snd_pcm_plugin_channel *v;
554 struct snd_pcm_plugin_format *format;
555 int width, nchannels, channel;
556 int stream = snd_pcm_plug_stream(plug);
557
558 if (snd_BUG_ON(!buf))
559 return -ENXIO;
560 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
561 plugin = snd_pcm_plug_first(plug);
562 format = &plugin->src_format;
563 } else {
564 plugin = snd_pcm_plug_last(plug);
565 format = &plugin->dst_format;
566 }
567 v = plugin->buf_channels;
568 *channels = v;
569 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
570 return width;
571 nchannels = format->channels;
572 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
573 format->channels > 1))
574 return -ENXIO;
575 for (channel = 0; channel < nchannels; channel++, v++) {
576 v->frames = count;
577 v->enabled = 1;
578 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
579 v->area.addr = buf;
580 v->area.first = channel * width;
581 v->area.step = nchannels * width;
582 }
583 return count;
584}
585
586snd_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)
587{
588 struct snd_pcm_plugin *plugin, *next;
589 struct snd_pcm_plugin_channel *dst_channels;
590 int err;
591 snd_pcm_sframes_t frames = size;
592
593 plugin = snd_pcm_plug_first(plug);
594 while (plugin && frames > 0) {
595 if ((next = plugin->next) != NULL) {
596 snd_pcm_sframes_t frames1 = frames;
597 if (plugin->dst_frames)
598 frames1 = plugin->dst_frames(plugin, frames);
599 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
600 return err;
601 }
602 if (err != frames1) {
603 frames = err;
604 if (plugin->src_frames)
605 frames = plugin->src_frames(plugin, frames1);
606 }
607 } else
608 dst_channels = NULL;
609 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
610 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
611 return frames;
612 src_channels = dst_channels;
613 plugin = next;
614 }
615 return snd_pcm_plug_client_size(plug, frames);
616}
617
618snd_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)
619{
620 struct snd_pcm_plugin *plugin, *next;
621 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
622 snd_pcm_sframes_t frames = size;
623 int err;
624
625 frames = snd_pcm_plug_slave_size(plug, frames);
626 if (frames < 0)
627 return frames;
628
629 src_channels = NULL;
630 plugin = snd_pcm_plug_first(plug);
631 while (plugin && frames > 0) {
632 if ((next = plugin->next) != NULL) {
633 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
634 return err;
635 }
636 frames = err;
637 } else {
638 dst_channels = dst_channels_final;
639 }
640 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
641 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
642 return frames;
643 plugin = next;
644 src_channels = dst_channels;
645 }
646 return frames;
647}
648
649int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
650 size_t samples, snd_pcm_format_t format)
651{
652
653 unsigned char *dst;
654 unsigned int dst_step;
655 int width;
656 const unsigned char *silence;
657 if (!dst_area->addr)
658 return 0;
659 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
660 width = snd_pcm_format_physical_width(format);
661 if (width <= 0)
662 return -EINVAL;
663 if (dst_area->step == (unsigned int) width && width >= 8)
664 return snd_pcm_format_set_silence(format, dst, samples);
665 silence = snd_pcm_format_silence_64(format);
666 if (! silence)
667 return -EINVAL;
668 dst_step = dst_area->step / 8;
669 if (width == 4) {
670
671 int dstbit = dst_area->first % 8;
672 int dstbit_step = dst_area->step % 8;
673 while (samples-- > 0) {
674 if (dstbit)
675 *dst &= 0xf0;
676 else
677 *dst &= 0x0f;
678 dst += dst_step;
679 dstbit += dstbit_step;
680 if (dstbit == 8) {
681 dst++;
682 dstbit = 0;
683 }
684 }
685 } else {
686 width /= 8;
687 while (samples-- > 0) {
688 memcpy(dst, silence, width);
689 dst += dst_step;
690 }
691 }
692 return 0;
693}
694
695int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
696 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
697 size_t samples, snd_pcm_format_t format)
698{
699
700 char *src, *dst;
701 int width;
702 int src_step, dst_step;
703 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
704 if (!src_area->addr)
705 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
706 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
707 if (!dst_area->addr)
708 return 0;
709 width = snd_pcm_format_physical_width(format);
710 if (width <= 0)
711 return -EINVAL;
712 if (src_area->step == (unsigned int) width &&
713 dst_area->step == (unsigned int) width && width >= 8) {
714 size_t bytes = samples * width / 8;
715 memcpy(dst, src, bytes);
716 return 0;
717 }
718 src_step = src_area->step / 8;
719 dst_step = dst_area->step / 8;
720 if (width == 4) {
721
722 int srcbit = src_area->first % 8;
723 int srcbit_step = src_area->step % 8;
724 int dstbit = dst_area->first % 8;
725 int dstbit_step = dst_area->step % 8;
726 while (samples-- > 0) {
727 unsigned char srcval;
728 if (srcbit)
729 srcval = *src & 0x0f;
730 else
731 srcval = (*src & 0xf0) >> 4;
732 if (dstbit)
733 *dst = (*dst & 0xf0) | srcval;
734 else
735 *dst = (*dst & 0x0f) | (srcval << 4);
736 src += src_step;
737 srcbit += srcbit_step;
738 if (srcbit == 8) {
739 src++;
740 srcbit = 0;
741 }
742 dst += dst_step;
743 dstbit += dstbit_step;
744 if (dstbit == 8) {
745 dst++;
746 dstbit = 0;
747 }
748 }
749 } else {
750 width /= 8;
751 while (samples-- > 0) {
752 memcpy(dst, src, width);
753 src += src_step;
754 dst += dst_step;
755 }
756 }
757 return 0;
758}
759
