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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 = snd_pcm_plug_stream(plug);
203
204 if (snd_BUG_ON(!plug))
205 return -ENXIO;
206 if (drv_frames == 0)
207 return 0;
208 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
209 plugin = snd_pcm_plug_last(plug);
210 while (plugin && drv_frames > 0) {
211 plugin_prev = plugin->prev;
212 if (plugin->src_frames)
213 drv_frames = plugin->src_frames(plugin, drv_frames);
214 plugin = plugin_prev;
215 }
216 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
217 plugin = snd_pcm_plug_first(plug);
218 while (plugin && drv_frames > 0) {
219 plugin_next = plugin->next;
220 if (plugin->dst_frames)
221 drv_frames = plugin->dst_frames(plugin, drv_frames);
222 plugin = plugin_next;
223 }
224 } else
225 snd_BUG();
226 return drv_frames;
227}
228
229snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
230{
231 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
232 snd_pcm_sframes_t frames;
233 int stream = snd_pcm_plug_stream(plug);
234
235 if (snd_BUG_ON(!plug))
236 return -ENXIO;
237 if (clt_frames == 0)
238 return 0;
239 frames = clt_frames;
240 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
241 plugin = snd_pcm_plug_first(plug);
242 while (plugin && frames > 0) {
243 plugin_next = plugin->next;
244 if (plugin->dst_frames) {
245 frames = plugin->dst_frames(plugin, frames);
246 if (frames < 0)
247 return frames;
248 }
249 plugin = plugin_next;
250 }
251 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
252 plugin = snd_pcm_plug_last(plug);
253 while (plugin) {
254 plugin_prev = plugin->prev;
255 if (plugin->src_frames) {
256 frames = plugin->src_frames(plugin, frames);
257 if (frames < 0)
258 return frames;
259 }
260 plugin = plugin_prev;
261 }
262 } else
263 snd_BUG();
264 return frames;
265}
266
267static int snd_pcm_plug_formats(struct snd_mask *mask, snd_pcm_format_t format)
268{
269 struct snd_mask formats = *mask;
270 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
271 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
272 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
273 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
274 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
275 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
276 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
277 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
278 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
279 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
280
281 if (formats.bits[0] & (u32)linfmts)
282 formats.bits[0] |= (u32)linfmts;
283 if (formats.bits[1] & (u32)(linfmts >> 32))
284 formats.bits[1] |= (u32)(linfmts >> 32);
285 return snd_mask_test(&formats, (__force int)format);
286}
287
288static snd_pcm_format_t preferred_formats[] = {
289 SNDRV_PCM_FORMAT_S16_LE,
290 SNDRV_PCM_FORMAT_S16_BE,
291 SNDRV_PCM_FORMAT_U16_LE,
292 SNDRV_PCM_FORMAT_U16_BE,
293 SNDRV_PCM_FORMAT_S24_3LE,
294 SNDRV_PCM_FORMAT_S24_3BE,
295 SNDRV_PCM_FORMAT_U24_3LE,
296 SNDRV_PCM_FORMAT_U24_3BE,
297 SNDRV_PCM_FORMAT_S24_LE,
298 SNDRV_PCM_FORMAT_S24_BE,
299 SNDRV_PCM_FORMAT_U24_LE,
300 SNDRV_PCM_FORMAT_U24_BE,
301 SNDRV_PCM_FORMAT_S32_LE,
302 SNDRV_PCM_FORMAT_S32_BE,
303 SNDRV_PCM_FORMAT_U32_LE,
304 SNDRV_PCM_FORMAT_U32_BE,
305 SNDRV_PCM_FORMAT_S8,
306 SNDRV_PCM_FORMAT_U8
307};
308
309snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
310 struct snd_mask *format_mask)
311{
312 int i;
313
314 if (snd_mask_test(format_mask, (__force int)format))
315 return format;
316 if (!snd_pcm_plug_formats(format_mask, format))
317 return (__force snd_pcm_format_t)-EINVAL;
318 if (snd_pcm_format_linear(format)) {
319 unsigned int width = snd_pcm_format_width(format);
320 int unsignd = snd_pcm_format_unsigned(format) > 0;
321 int big = snd_pcm_format_big_endian(format) > 0;
322 unsigned int badness, best = -1;
323 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
324 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
325 snd_pcm_format_t f = preferred_formats[i];
326 unsigned int w;
327 if (!snd_mask_test(format_mask, (__force int)f))
328 continue;
329 w = snd_pcm_format_width(f);
330 if (w >= width)
331 badness = w - width;
332 else
333 badness = width - w + 32;
334 badness += snd_pcm_format_unsigned(f) != unsignd;
335 badness += snd_pcm_format_big_endian(f) != big;
336 if (badness < best) {
337 best_format = f;
338 best = badness;
339 }
340 }
341 if ((__force int)best_format >= 0)
342 return best_format;
343 else
344 return (__force snd_pcm_format_t)-EINVAL;
345 } else {
346 switch (format) {
347 case SNDRV_PCM_FORMAT_MU_LAW:
348 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
349 snd_pcm_format_t format1 = preferred_formats[i];
350 if (snd_mask_test(format_mask, (__force int)format1))
351 return format1;
352 }
353 default:
354 return (__force snd_pcm_format_t)-EINVAL;
355 }
356 }
357}
358
359int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
360 struct snd_pcm_hw_params *params,
361 struct snd_pcm_hw_params *slave_params)
362{
363 struct snd_pcm_plugin_format tmpformat;
364 struct snd_pcm_plugin_format dstformat;
365 struct snd_pcm_plugin_format srcformat;
366 snd_pcm_access_t src_access, dst_access;
367 struct snd_pcm_plugin *plugin = NULL;
368 int err;
369 int stream = snd_pcm_plug_stream(plug);
370 int slave_interleaved = (params_channels(slave_params) == 1 ||
371 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
372
373 switch (stream) {
374 case SNDRV_PCM_STREAM_PLAYBACK:
375 dstformat.format = params_format(slave_params);
376 dstformat.rate = params_rate(slave_params);
377 dstformat.channels = params_channels(slave_params);
378 srcformat.format = params_format(params);
379 srcformat.rate = params_rate(params);
380 srcformat.channels = params_channels(params);
381 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
382 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
383 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
384 break;
385 case SNDRV_PCM_STREAM_CAPTURE:
386 dstformat.format = params_format(params);
387 dstformat.rate = params_rate(params);
388 dstformat.channels = params_channels(params);
389 srcformat.format = params_format(slave_params);
390 srcformat.rate = params_rate(slave_params);
391 srcformat.channels = params_channels(slave_params);
392 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
393 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
394 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
395 break;
396 default:
397 snd_BUG();
398 return -EINVAL;
399 }
400 tmpformat = srcformat;
401
402 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
403 srcformat.format,
404 srcformat.rate,
405 srcformat.channels);
406 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
407 dstformat.format,
408 dstformat.rate,
409 dstformat.channels);
410
411
412 if (! rate_match(srcformat.rate, dstformat.rate) &&
413 ! snd_pcm_format_linear(srcformat.format)) {
414 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
415 return -EINVAL;
416 tmpformat.format = SNDRV_PCM_FORMAT_S16;
417 err = snd_pcm_plugin_build_mulaw(plug,
418 &srcformat, &tmpformat,
419 &plugin);
420 if (err < 0)
421 return err;
422 err = snd_pcm_plugin_append(plugin);
423 if (err < 0) {
424 snd_pcm_plugin_free(plugin);
425 return err;
426 }
427 srcformat = tmpformat;
428 src_access = dst_access;
429 }
430
431
432 if (srcformat.channels > dstformat.channels) {
433 tmpformat.channels = dstformat.channels;
434 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
435 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
436 if (err < 0)
437 return err;
438 err = snd_pcm_plugin_append(plugin);
439 if (err < 0) {
440 snd_pcm_plugin_free(plugin);
441 return err;
442 }
443 srcformat = tmpformat;
444 src_access = dst_access;
445 }
446
447
448 if (!rate_match(srcformat.rate, dstformat.rate)) {
449 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
450
451 tmpformat.format = SNDRV_PCM_FORMAT_S16;
452 err = snd_pcm_plugin_build_linear(plug,
453 &srcformat, &tmpformat,
454 &plugin);
455 if (err < 0)
456 return err;
457 err = snd_pcm_plugin_append(plugin);
458 if (err < 0) {
459 snd_pcm_plugin_free(plugin);
460 return err;
461 }
462 srcformat = tmpformat;
463 src_access = dst_access;
464 }
465 tmpformat.rate = dstformat.rate;
466 err = snd_pcm_plugin_build_rate(plug,
467 &srcformat, &tmpformat,
468 &plugin);
469 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
470 if (err < 0)
471 return err;
472 err = snd_pcm_plugin_append(plugin);
473 if (err < 0) {
474 snd_pcm_plugin_free(plugin);
475 return err;
476 }
477 srcformat = tmpformat;
478 src_access = dst_access;
479 }
480
481
482 if (srcformat.format != dstformat.format) {
483 tmpformat.format = dstformat.format;
484 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
485 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
486 err = snd_pcm_plugin_build_mulaw(plug,
487 &srcformat, &tmpformat,
488 &plugin);
489 }
490 else if (snd_pcm_format_linear(srcformat.format) &&
491 snd_pcm_format_linear(tmpformat.format)) {
492 err = snd_pcm_plugin_build_linear(plug,
493 &srcformat, &tmpformat,
494 &plugin);
495 }
496 else
497 return -EINVAL;
498 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
499 if (err < 0)
500 return err;
501 err = snd_pcm_plugin_append(plugin);
502 if (err < 0) {
503 snd_pcm_plugin_free(plugin);
504 return err;
505 }
506 srcformat = tmpformat;
507 src_access = dst_access;
508 }
509
510
511 if (srcformat.channels < dstformat.channels) {
512 tmpformat.channels = dstformat.channels;
513 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
514 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
515 if (err < 0)
516 return err;
517 err = snd_pcm_plugin_append(plugin);
518 if (err < 0) {
519 snd_pcm_plugin_free(plugin);
520 return err;
521 }
522 srcformat = tmpformat;
523 src_access = dst_access;
524 }
525
526
527 if (src_access != dst_access) {
528 err = snd_pcm_plugin_build_copy(plug,
529 &srcformat,
530 &tmpformat,
531 &plugin);
532 pdprintf("interleave change (copy: returns %i)\n", err);
533 if (err < 0)
534 return err;
535 err = snd_pcm_plugin_append(plugin);
536 if (err < 0) {
537 snd_pcm_plugin_free(plugin);
538 return err;
539 }
540 }
541
542 return 0;
543}
544
545snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
546 char *buf,
547 snd_pcm_uframes_t count,
548 struct snd_pcm_plugin_channel **channels)
549{
550 struct snd_pcm_plugin *plugin;
551 struct snd_pcm_plugin_channel *v;
552 struct snd_pcm_plugin_format *format;
553 int width, nchannels, channel;
554 int stream = snd_pcm_plug_stream(plug);
555
556 if (snd_BUG_ON(!buf))
557 return -ENXIO;
558 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
559 plugin = snd_pcm_plug_first(plug);
560 format = &plugin->src_format;
561 } else {
562 plugin = snd_pcm_plug_last(plug);
563 format = &plugin->dst_format;
564 }
565 v = plugin->buf_channels;
566 *channels = v;
567 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
568 return width;
569 nchannels = format->channels;
570 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
571 format->channels > 1))
572 return -ENXIO;
573 for (channel = 0; channel < nchannels; channel++, v++) {
574 v->frames = count;
575 v->enabled = 1;
576 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
577 v->area.addr = buf;
578 v->area.first = channel * width;
579 v->area.step = nchannels * width;
580 }
581 return count;
582}
583
584snd_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)
585{
586 struct snd_pcm_plugin *plugin, *next;
587 struct snd_pcm_plugin_channel *dst_channels;
588 int err;
589 snd_pcm_sframes_t frames = size;
590
591 plugin = snd_pcm_plug_first(plug);
592 while (plugin && frames > 0) {
593 if ((next = plugin->next) != NULL) {
594 snd_pcm_sframes_t frames1 = frames;
595 if (plugin->dst_frames)
596 frames1 = plugin->dst_frames(plugin, frames);
597 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
598 return err;
599 }
600 if (err != frames1) {
601 frames = err;
602 if (plugin->src_frames)
603 frames = plugin->src_frames(plugin, frames1);
604 }
605 } else
606 dst_channels = NULL;
607 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
608 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
609 return frames;
610 src_channels = dst_channels;
611 plugin = next;
612 }
613 return snd_pcm_plug_client_size(plug, frames);
614}
615
616snd_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)
617{
618 struct snd_pcm_plugin *plugin, *next;
619 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
620 snd_pcm_sframes_t frames = size;
621 int err;
622
623 frames = snd_pcm_plug_slave_size(plug, frames);
624 if (frames < 0)
625 return frames;
626
627 src_channels = NULL;
628 plugin = snd_pcm_plug_first(plug);
629 while (plugin && frames > 0) {
630 if ((next = plugin->next) != NULL) {
631 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
632 return err;
633 }
634 frames = err;
635 } else {
636 dst_channels = dst_channels_final;
637 }
638 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
639 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
640 return frames;
641 plugin = next;
642 src_channels = dst_channels;
643 }
644 return frames;
645}
646
647int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
648 size_t samples, snd_pcm_format_t format)
649{
650
651 unsigned char *dst;
652 unsigned int dst_step;
653 int width;
654 const unsigned char *silence;
655 if (!dst_area->addr)
656 return 0;
657 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
658 width = snd_pcm_format_physical_width(format);
659 if (width <= 0)
660 return -EINVAL;
661 if (dst_area->step == (unsigned int) width && width >= 8)
662 return snd_pcm_format_set_silence(format, dst, samples);
663 silence = snd_pcm_format_silence_64(format);
664 if (! silence)
665 return -EINVAL;
666 dst_step = dst_area->step / 8;
667 if (width == 4) {
668
669 int dstbit = dst_area->first % 8;
670 int dstbit_step = dst_area->step % 8;
671 while (samples-- > 0) {
672 if (dstbit)
673 *dst &= 0xf0;
674 else
675 *dst &= 0x0f;
676 dst += dst_step;
677 dstbit += dstbit_step;
678 if (dstbit == 8) {
679 dst++;
680 dstbit = 0;
681 }
682 }
683 } else {
684 width /= 8;
685 while (samples-- > 0) {
686 memcpy(dst, silence, width);
687 dst += dst_step;
688 }
689 }
690 return 0;
691}
692
693int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
694 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
695 size_t samples, snd_pcm_format_t format)
696{
697
698 char *src, *dst;
699 int width;
700 int src_step, dst_step;
701 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
702 if (!src_area->addr)
703 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
704 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
705 if (!dst_area->addr)
706 return 0;
707 width = snd_pcm_format_physical_width(format);
708 if (width <= 0)
709 return -EINVAL;
710 if (src_area->step == (unsigned int) width &&
711 dst_area->step == (unsigned int) width && width >= 8) {
712 size_t bytes = samples * width / 8;
713 memcpy(dst, src, bytes);
714 return 0;
715 }
716 src_step = src_area->step / 8;
717 dst_step = dst_area->step / 8;
718 if (width == 4) {
719
720 int srcbit = src_area->first % 8;
721 int srcbit_step = src_area->step % 8;
722 int dstbit = dst_area->first % 8;
723 int dstbit_step = dst_area->step % 8;
724 while (samples-- > 0) {
725 unsigned char srcval;
726 if (srcbit)
727 srcval = *src & 0x0f;
728 else
729 srcval = (*src & 0xf0) >> 4;
730 if (dstbit)
731 *dst = (*dst & 0xf0) | srcval;
732 else
733 *dst = (*dst & 0x0f) | (srcval << 4);
734 src += src_step;
735 srcbit += srcbit_step;
736 if (srcbit == 8) {
737 src++;
738 srcbit = 0;
739 }
740 dst += dst_step;
741 dstbit += dstbit_step;
742 if (dstbit == 8) {
743 dst++;
744 dstbit = 0;
745 }
746 }
747 } else {
748 width /= 8;
749 while (samples-- > 0) {
750 memcpy(dst, src, width);
751 src += src_step;
752 dst += dst_step;
753 }
754 }
755 return 0;
756}
757
