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[POWERPC] add clrsetbits macros
[linux-2.6/kvm.git] / sound / core / oss / pcm_plugin.c
blob0e67dd280a5d4ea8490b6758f424ec6b4cbdc583
1 /*
2 * PCM Plug-In shared (kernel/library) code
3 * Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
4 * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Library General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #if 0
24 #define PLUGIN_DEBUG
25 #endif
26
27 #include <sound/driver.h>
28
29 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
30
31 #include <linux/slab.h>
32 #include <linux/time.h>
33 #include <linux/vmalloc.h>
34 #include <sound/core.h>
35 #include <sound/pcm.h>
36 #include <sound/pcm_params.h>
37 #include "pcm_plugin.h"
38
39 #define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
40 #define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
41
42 /*
43 * because some cards might have rates "very close", we ignore
44 * all "resampling" requests within +-5%
45 */
46 static int rate_match(unsigned int src_rate, unsigned int dst_rate)
47 {
48 unsigned int low = (src_rate * 95) / 100;
49 unsigned int high = (src_rate * 105) / 100;
50 return dst_rate >= low && dst_rate <= high;
51 }
52
53 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
54 {
55 struct snd_pcm_plugin_format *format;
56 ssize_t width;
57 size_t size;
58 unsigned int channel;
59 struct snd_pcm_plugin_channel *c;
60
61 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
62 format = &plugin->src_format;
63 } else {
64 format = &plugin->dst_format;
65 }
66 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
67 return width;
68 size = frames * format->channels * width;
69 snd_assert((size % 8) == 0, return -ENXIO);
70 size /= 8;
71 if (plugin->buf_frames < frames) {
72 vfree(plugin->buf);
73 plugin->buf = vmalloc(size);
74 plugin->buf_frames = frames;
75 }
76 if (!plugin->buf) {
77 plugin->buf_frames = 0;
78 return -ENOMEM;
79 }
80 c = plugin->buf_channels;
81 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
82 for (channel = 0; channel < format->channels; channel++, c++) {
83 c->frames = frames;
84 c->enabled = 1;
85 c->wanted = 0;
86 c->area.addr = plugin->buf;
87 c->area.first = channel * width;
88 c->area.step = format->channels * width;
89 }
90 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
91 snd_assert((size % format->channels) == 0,);
92 size /= format->channels;
93 for (channel = 0; channel < format->channels; channel++, c++) {
94 c->frames = frames;
95 c->enabled = 1;
96 c->wanted = 0;
97 c->area.addr = plugin->buf + (channel * size);
98 c->area.first = 0;
99 c->area.step = width;
100 }
101 } else
102 return -EINVAL;
103 return 0;
104 }
105
106 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
107 {
108 int err;
109 snd_assert(snd_pcm_plug_first(plug) != NULL, 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 snd_assert(frames > 0, 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 snd_assert(frames > 0, return -ENXIO);
127 plugin = plugin->prev;
128 err = snd_pcm_plugin_alloc(plugin, frames);
129 if (err < 0)
130 return err;
131 }
132 }
133 return 0;
134 }
135
136
137 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
138 snd_pcm_uframes_t frames,
139 struct snd_pcm_plugin_channel **channels)
140 {
141 *channels = plugin->buf_channels;
142 return frames;
143 }
144
145 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
146 const char *name,
147 struct snd_pcm_plugin_format *src_format,
148 struct snd_pcm_plugin_format *dst_format,
149 size_t extra,
150 struct snd_pcm_plugin **ret)
151 {
152 struct snd_pcm_plugin *plugin;
153 unsigned int channels;
154
155 snd_assert(plug != NULL, return -ENXIO);
156 snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);
157 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
158 if (plugin == NULL)
159 return -ENOMEM;
160 plugin->name = name;
161 plugin->plug = plug;
162 plugin->stream = snd_pcm_plug_stream(plug);
163 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
164 plugin->src_format = *src_format;
165 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
166 snd_assert(plugin->src_width > 0, );
167 plugin->dst_format = *dst_format;
168 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
169 snd_assert(plugin->dst_width > 0, );
170 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
171 channels = src_format->channels;
172 else
173 channels = dst_format->channels;
174 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
175 if (plugin->buf_channels == NULL) {
176 snd_pcm_plugin_free(plugin);
177 return -ENOMEM;
178 }
179 plugin->client_channels = snd_pcm_plugin_client_channels;
180 *ret = plugin;
181 return 0;
182 }
183
184 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
185 {
186 if (! plugin)
187 return 0;
188 if (plugin->private_free)
189 plugin->private_free(plugin);
190 kfree(plugin->buf_channels);
191 vfree(plugin->buf);
192 kfree(plugin);
193 return 0;
194 }
195
196 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
197 {
198 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
199 int stream = snd_pcm_plug_stream(plug);
200
201 snd_assert(plug != NULL, return -ENXIO);
202 if (drv_frames == 0)
203 return 0;
204 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
205 plugin = snd_pcm_plug_last(plug);
206 while (plugin && drv_frames > 0) {
207 plugin_prev = plugin->prev;
208 if (plugin->src_frames)
209 drv_frames = plugin->src_frames(plugin, drv_frames);
210 plugin = plugin_prev;
211 }
212 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
213 plugin = snd_pcm_plug_first(plug);
214 while (plugin && drv_frames > 0) {
215 plugin_next = plugin->next;
216 if (plugin->dst_frames)
217 drv_frames = plugin->dst_frames(plugin, drv_frames);
218 plugin = plugin_next;
219 }
220 } else
221 snd_BUG();
222 return drv_frames;
223 }
224
225 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
226 {
227 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
228 snd_pcm_sframes_t frames;
229 int stream = snd_pcm_plug_stream(plug);
230
231 snd_assert(plug != NULL, return -ENXIO);
232 if (clt_frames == 0)
233 return 0;
234 frames = clt_frames;
235 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
236 plugin = snd_pcm_plug_first(plug);
237 while (plugin && frames > 0) {
238 plugin_next = plugin->next;
239 if (plugin->dst_frames) {
240 frames = plugin->dst_frames(plugin, frames);
241 if (frames < 0)
242 return frames;
243 }
244 plugin = plugin_next;
245 }
246 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
247 plugin = snd_pcm_plug_last(plug);
248 while (plugin) {
249 plugin_prev = plugin->prev;
250 if (plugin->src_frames) {
251 frames = plugin->src_frames(plugin, frames);
252 if (frames < 0)
253 return frames;
254 }
255 plugin = plugin_prev;
256 }
257 } else
258 snd_BUG();
259 return frames;
260 }
261
262 static int snd_pcm_plug_formats(struct snd_mask *mask, int format)
263 {
264 struct snd_mask formats = *mask;
265 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
266 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
267 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
268 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
269 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
270 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
271 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
272 snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);
273
274 if (formats.bits[0] & (u32)linfmts)
275 formats.bits[0] |= (u32)linfmts;
276 if (formats.bits[1] & (u32)(linfmts >> 32))
277 formats.bits[1] |= (u32)(linfmts >> 32);
278 return snd_mask_test(&formats, format);
279 }
280
281 static int preferred_formats[] = {
282 SNDRV_PCM_FORMAT_S16_LE,
283 SNDRV_PCM_FORMAT_S16_BE,
284 SNDRV_PCM_FORMAT_U16_LE,
285 SNDRV_PCM_FORMAT_U16_BE,
286 SNDRV_PCM_FORMAT_S24_LE,
287 SNDRV_PCM_FORMAT_S24_BE,
288 SNDRV_PCM_FORMAT_U24_LE,
289 SNDRV_PCM_FORMAT_U24_BE,
290 SNDRV_PCM_FORMAT_S32_LE,
291 SNDRV_PCM_FORMAT_S32_BE,
292 SNDRV_PCM_FORMAT_U32_LE,
293 SNDRV_PCM_FORMAT_U32_BE,
294 SNDRV_PCM_FORMAT_S8,
295 SNDRV_PCM_FORMAT_U8
296 };
297
298 int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask)
299 {
300 if (snd_mask_test(format_mask, format))
301 return format;
302 if (! snd_pcm_plug_formats(format_mask, format))
303 return -EINVAL;
304 if (snd_pcm_format_linear(format)) {
305 int width = snd_pcm_format_width(format);
306 int unsignd = snd_pcm_format_unsigned(format);
307 int big = snd_pcm_format_big_endian(format);
308 int format1;
309 int wid, width1=width;
310 int dwidth1 = 8;
311 for (wid = 0; wid < 4; ++wid) {
312 int end, big1 = big;
313 for (end = 0; end < 2; ++end) {
314 int sgn, unsignd1 = unsignd;
315 for (sgn = 0; sgn < 2; ++sgn) {
316 format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);
317 if (format1 >= 0 &&
318 snd_mask_test(format_mask, format1))
319 goto _found;
320 unsignd1 = !unsignd1;
321 }
322 big1 = !big1;
323 }
324 if (width1 == 32) {
325 dwidth1 = -dwidth1;
326 width1 = width;
327 }
328 width1 += dwidth1;
329 }
330 return -EINVAL;
331 _found:
332 return format1;
333 } else {
334 unsigned int i;
335 switch (format) {
336 case SNDRV_PCM_FORMAT_MU_LAW:
337 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
338 int format1 = preferred_formats[i];
339 if (snd_mask_test(format_mask, format1))
340 return format1;
341 }
342 default:
343 return -EINVAL;
344 }
345 }
346 }
347
348 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
349 struct snd_pcm_hw_params *params,
350 struct snd_pcm_hw_params *slave_params)
351 {
352 struct snd_pcm_plugin_format tmpformat;
353 struct snd_pcm_plugin_format dstformat;
354 struct snd_pcm_plugin_format srcformat;
355 int src_access, dst_access;
356 struct snd_pcm_plugin *plugin = NULL;
357 int err;
358 int stream = snd_pcm_plug_stream(plug);
359 int slave_interleaved = (params_channels(slave_params) == 1 ||
360 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
361
362 switch (stream) {
363 case SNDRV_PCM_STREAM_PLAYBACK:
364 dstformat.format = params_format(slave_params);
365 dstformat.rate = params_rate(slave_params);
366 dstformat.channels = params_channels(slave_params);
367 srcformat.format = params_format(params);
368 srcformat.rate = params_rate(params);
369 srcformat.channels = params_channels(params);
370 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
371 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
372 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
373 break;
374 case SNDRV_PCM_STREAM_CAPTURE:
375 dstformat.format = params_format(params);
376 dstformat.rate = params_rate(params);
377 dstformat.channels = params_channels(params);
378 srcformat.format = params_format(slave_params);
379 srcformat.rate = params_rate(slave_params);
380 srcformat.channels = params_channels(slave_params);
381 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
382 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
383 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
384 break;
385 default:
386 snd_BUG();
387 return -EINVAL;
388 }
389 tmpformat = srcformat;
390
391 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
392 srcformat.format,
393 srcformat.rate,
394 srcformat.channels);
395 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
396 dstformat.format,
397 dstformat.rate,
398 dstformat.channels);
399
400 /* Format change (linearization) */
401 if (! rate_match(srcformat.rate, dstformat.rate) &&
402 ! snd_pcm_format_linear(srcformat.format)) {
403 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
404 return -EINVAL;
405 tmpformat.format = SNDRV_PCM_FORMAT_S16;
406 err = snd_pcm_plugin_build_mulaw(plug,
407 &srcformat, &tmpformat,
408 &plugin);
409 if (err < 0)
410 return err;
411 err = snd_pcm_plugin_append(plugin);
412 if (err < 0) {
413 snd_pcm_plugin_free(plugin);
414 return err;
415 }
416 srcformat = tmpformat;
417 src_access = dst_access;
418 }
419
420 /* channels reduction */
421 if (srcformat.channels > dstformat.channels) {
422 tmpformat.channels = dstformat.channels;
423 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
424 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
425 if (err < 0)
426 return err;
427 err = snd_pcm_plugin_append(plugin);
428 if (err < 0) {
429 snd_pcm_plugin_free(plugin);
430 return err;
431 }
432 srcformat = tmpformat;
433 src_access = dst_access;
434 }
435
436 /* rate resampling */
437 if (!rate_match(srcformat.rate, dstformat.rate)) {
438 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
439 /* convert to S16 for resampling */
440 tmpformat.format = SNDRV_PCM_FORMAT_S16;
441 err = snd_pcm_plugin_build_linear(plug,
442 &srcformat, &tmpformat,
443 &plugin);
444 if (err < 0)
445 return err;
446 err = snd_pcm_plugin_append(plugin);
447 if (err < 0) {
448 snd_pcm_plugin_free(plugin);
449 return err;
450 }
451 srcformat = tmpformat;
452 src_access = dst_access;
453 }
454 tmpformat.rate = dstformat.rate;
455 err = snd_pcm_plugin_build_rate(plug,
456 &srcformat, &tmpformat,
457 &plugin);
458 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
459 if (err < 0)
460 return err;
461 err = snd_pcm_plugin_append(plugin);
462 if (err < 0) {
463 snd_pcm_plugin_free(plugin);
464 return err;
465 }
466 srcformat = tmpformat;
467 src_access = dst_access;
468 }
469
470 /* format change */
471 if (srcformat.format != dstformat.format) {
472 tmpformat.format = dstformat.format;
473 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
474 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
475 err = snd_pcm_plugin_build_mulaw(plug,
476 &srcformat, &tmpformat,
477 &plugin);
478 }
479 else if (snd_pcm_format_linear(srcformat.format) &&
480 snd_pcm_format_linear(tmpformat.format)) {
481 err = snd_pcm_plugin_build_linear(plug,
482 &srcformat, &tmpformat,
483 &plugin);
484 }
485 else
486 return -EINVAL;
487 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
488 if (err < 0)
489 return err;
490 err = snd_pcm_plugin_append(plugin);
491 if (err < 0) {
492 snd_pcm_plugin_free(plugin);
493 return err;
494 }
495 srcformat = tmpformat;
496 src_access = dst_access;
497 }
498
499 /* channels extension */
500 if (srcformat.channels < dstformat.channels) {
501 tmpformat.channels = dstformat.channels;
502 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
503 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
504 if (err < 0)
505 return err;
506 err = snd_pcm_plugin_append(plugin);
507 if (err < 0) {
508 snd_pcm_plugin_free(plugin);
509 return err;
510 }
511 srcformat = tmpformat;
512 src_access = dst_access;
513 }
514
515 /* de-interleave */
516 if (src_access != dst_access) {
517 err = snd_pcm_plugin_build_copy(plug,
518 &srcformat,
519 &tmpformat,
520 &plugin);
521 pdprintf("interleave change (copy: returns %i)\n", err);
522 if (err < 0)
523 return err;
524 err = snd_pcm_plugin_append(plugin);
525 if (err < 0) {
526 snd_pcm_plugin_free(plugin);
527 return err;
528 }
529 }
530
531 return 0;
532 }
533
534 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
535 char *buf,
536 snd_pcm_uframes_t count,
537 struct snd_pcm_plugin_channel **channels)
538 {
539 struct snd_pcm_plugin *plugin;
540 struct snd_pcm_plugin_channel *v;
541 struct snd_pcm_plugin_format *format;
542 int width, nchannels, channel;
543 int stream = snd_pcm_plug_stream(plug);
544
545 snd_assert(buf != NULL, return -ENXIO);
546 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
547 plugin = snd_pcm_plug_first(plug);
548 format = &plugin->src_format;
549 } else {
550 plugin = snd_pcm_plug_last(plug);
551 format = &plugin->dst_format;
552 }
553 v = plugin->buf_channels;
554 *channels = v;
555 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
556 return width;
557 nchannels = format->channels;
558 snd_assert(plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || format->channels <= 1, return -ENXIO);
559 for (channel = 0; channel < nchannels; channel++, v++) {
560 v->frames = count;
561 v->enabled = 1;
562 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
563 v->area.addr = buf;
564 v->area.first = channel * width;
565 v->area.step = nchannels * width;
566 }
567 return count;
568 }
569
570 snd_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)
571 {
572 struct snd_pcm_plugin *plugin, *next;
573 struct snd_pcm_plugin_channel *dst_channels;
574 int err;
575 snd_pcm_sframes_t frames = size;
576
577 plugin = snd_pcm_plug_first(plug);
578 while (plugin && frames > 0) {
579 if ((next = plugin->next) != NULL) {
580 snd_pcm_sframes_t frames1 = frames;
581 if (plugin->dst_frames)
582 frames1 = plugin->dst_frames(plugin, frames);
583 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
584 return err;
585 }
586 if (err != frames1) {
587 frames = err;
588 if (plugin->src_frames)
589 frames = plugin->src_frames(plugin, frames1);
590 }
591 } else
592 dst_channels = NULL;
593 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
594 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
595 return frames;
596 src_channels = dst_channels;
597 plugin = next;
598 }
599 return snd_pcm_plug_client_size(plug, frames);
600 }
601
602 snd_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)
603 {
604 struct snd_pcm_plugin *plugin, *next;
605 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
606 snd_pcm_sframes_t frames = size;
607 int err;
608
609 frames = snd_pcm_plug_slave_size(plug, frames);
610 if (frames < 0)
611 return frames;
612
613 src_channels = NULL;
614 plugin = snd_pcm_plug_first(plug);
615 while (plugin && frames > 0) {
616 if ((next = plugin->next) != NULL) {
617 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
618 return err;
619 }
620 frames = err;
621 } else {
622 dst_channels = dst_channels_final;
623 }
624 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
625 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
626 return frames;
627 plugin = next;
628 src_channels = dst_channels;
629 }
630 return frames;
631 }
632
633 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
634 size_t samples, int format)
635 {
636 /* FIXME: sub byte resolution and odd dst_offset */
637 unsigned char *dst;
638 unsigned int dst_step;
639 int width;
640 const unsigned char *silence;
641 if (!dst_area->addr)
642 return 0;
643 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
644 width = snd_pcm_format_physical_width(format);
645 if (width <= 0)
646 return -EINVAL;
647 if (dst_area->step == (unsigned int) width && width >= 8)
648 return snd_pcm_format_set_silence(format, dst, samples);
649 silence = snd_pcm_format_silence_64(format);
650 if (! silence)
651 return -EINVAL;
652 dst_step = dst_area->step / 8;
653 if (width == 4) {
654 /* Ima ADPCM */
655 int dstbit = dst_area->first % 8;
656 int dstbit_step = dst_area->step % 8;
657 while (samples-- > 0) {
658 if (dstbit)
659 *dst &= 0xf0;
660 else
661 *dst &= 0x0f;
662 dst += dst_step;
663 dstbit += dstbit_step;
664 if (dstbit == 8) {
665 dst++;
666 dstbit = 0;
667 }
668 }
669 } else {
670 width /= 8;
671 while (samples-- > 0) {
672 memcpy(dst, silence, width);
673 dst += dst_step;
674 }
675 }
676 return 0;
677 }
678
679 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
680 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
681 size_t samples, int format)
682 {
683 /* FIXME: sub byte resolution and odd dst_offset */
684 char *src, *dst;
685 int width;
686 int src_step, dst_step;
687 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
688 if (!src_area->addr)
689 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
690 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
691 if (!dst_area->addr)
692 return 0;
693 width = snd_pcm_format_physical_width(format);
694 if (width <= 0)
695 return -EINVAL;
696 if (src_area->step == (unsigned int) width &&
697 dst_area->step == (unsigned int) width && width >= 8) {
698 size_t bytes = samples * width / 8;
699 memcpy(dst, src, bytes);
700 return 0;
701 }
702 src_step = src_area->step / 8;
703 dst_step = dst_area->step / 8;
704 if (width == 4) {
705 /* Ima ADPCM */
706 int srcbit = src_area->first % 8;
707 int srcbit_step = src_area->step % 8;
708 int dstbit = dst_area->first % 8;
709 int dstbit_step = dst_area->step % 8;
710 while (samples-- > 0) {
711 unsigned char srcval;
712 if (srcbit)
713 srcval = *src & 0x0f;
714 else
715 srcval = (*src & 0xf0) >> 4;
716 if (dstbit)
717 *dst = (*dst & 0xf0) | srcval;
718 else
719 *dst = (*dst & 0x0f) | (srcval << 4);
720 src += src_step;
721 srcbit += srcbit_step;
722 if (srcbit == 8) {
723 src++;
724 srcbit = 0;
725 }
726 dst += dst_step;
727 dstbit += dstbit_step;
728 if (dstbit == 8) {
729 dst++;
730 dstbit = 0;
731 }
732 }
733 } else {
734 width /= 8;
735 while (samples-- > 0) {
736 memcpy(dst, src, width);
737 src += src_step;
738 dst += dst_step;
739 }
740 }
741 return 0;
742 }
743
744 #endif
kernel-based virtual machine