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