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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(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
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
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
451 if (!rate_match(srcformat.rate, dstformat.rate)) {
452 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
453
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
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
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
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 && frames > 0) {
596 if ((next = plugin->next) != NULL) {
597 snd_pcm_sframes_t frames1 = frames;
598 if (plugin->dst_frames)
599 frames1 = plugin->dst_frames(plugin, frames);
600 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
601 return err;
602 }
603 if (err != frames1) {
604 frames = err;
605 if (plugin->src_frames)
606 frames = plugin->src_frames(plugin, frames1);
607 }
608 } else
609 dst_channels = NULL;
610 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
611 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
612 return frames;
613 src_channels = dst_channels;
614 plugin = next;
615 }
616 return snd_pcm_plug_client_size(plug, frames);
617}
618
619snd_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)
620{
621 struct snd_pcm_plugin *plugin, *next;
622 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
623 snd_pcm_sframes_t frames = size;
624 int err;
625
626 frames = snd_pcm_plug_slave_size(plug, frames);
627 if (frames < 0)
628 return frames;
629
630 src_channels = NULL;
631 plugin = snd_pcm_plug_first(plug);
632 while (plugin && frames > 0) {
633 if ((next = plugin->next) != NULL) {
634 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
635 return err;
636 }
637 frames = err;
638 } else {
639 dst_channels = dst_channels_final;
640 }
641 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
642 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
643 return frames;
644 plugin = next;
645 src_channels = dst_channels;
646 }
647 return frames;
648}
649
650int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
651 size_t samples, snd_pcm_format_t format)
652{
653
654 unsigned char *dst;
655 unsigned int dst_step;
656 int width;
657 const unsigned char *silence;
658 if (!dst_area->addr)
659 return 0;
660 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
661 width = snd_pcm_format_physical_width(format);
662 if (width <= 0)
663 return -EINVAL;
664 if (dst_area->step == (unsigned int) width && width >= 8)
665 return snd_pcm_format_set_silence(format, dst, samples);
666 silence = snd_pcm_format_silence_64(format);
667 if (! silence)
668 return -EINVAL;
669 dst_step = dst_area->step / 8;
670 if (width == 4) {
671
672 int dstbit = dst_area->first % 8;
673 int dstbit_step = dst_area->step % 8;
674 while (samples-- > 0) {
675 if (dstbit)
676 *dst &= 0xf0;
677 else
678 *dst &= 0x0f;
679 dst += dst_step;
680 dstbit += dstbit_step;
681 if (dstbit == 8) {
682 dst++;
683 dstbit = 0;
684 }
685 }
686 } else {
687 width /= 8;
688 while (samples-- > 0) {
689 memcpy(dst, silence, width);
690 dst += dst_step;
691 }
692 }
693 return 0;
694}
695
696int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
697 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
698 size_t samples, snd_pcm_format_t format)
699{
700
701 char *src, *dst;
702 int width;
703 int src_step, dst_step;
704 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
705 if (!src_area->addr)
706 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
707 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
708 if (!dst_area->addr)
709 return 0;
710 width = snd_pcm_format_physical_width(format);
711 if (width <= 0)
712 return -EINVAL;
713 if (src_area->step == (unsigned int) width &&
714 dst_area->step == (unsigned int) width && width >= 8) {
715 size_t bytes = samples * width / 8;
716 memcpy(dst, src, bytes);
717 return 0;
718 }
719 src_step = src_area->step / 8;
720 dst_step = dst_area->step / 8;
721 if (width == 4) {
722
723 int srcbit = src_area->first % 8;
724 int srcbit_step = src_area->step % 8;
725 int dstbit = dst_area->first % 8;
726 int dstbit_step = dst_area->step % 8;
727 while (samples-- > 0) {
728 unsigned char srcval;
729 if (srcbit)
730 srcval = *src & 0x0f;
731 else
732 srcval = (*src & 0xf0) >> 4;
733 if (dstbit)
734 *dst = (*dst & 0xf0) | srcval;
735 else
736 *dst = (*dst & 0x0f) | (srcval << 4);
737 src += src_step;
738 srcbit += srcbit_step;
739 if (srcbit == 8) {
740 src++;
741 srcbit = 0;
742 }
743 dst += dst_step;
744 dstbit += dstbit_step;
745 if (dstbit == 8) {
746 dst++;
747 dstbit = 0;
748 }
749 }
750 } else {
751 width /= 8;
752 while (samples-- > 0) {
753 memcpy(dst, src, width);
754 src += src_step;
755 dst += dst_step;
756 }
757 }
758 return 0;
759}
760
