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[PATCH] kref: avoid an atomic operation in kref_put()
[linux-2.6/openmoko-kernel/knife-kernel.git] / sound / core / oss / pcm_plugin.c
blob7e8676880dde16f5d74fb75f63d361883c9b08b2
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 #include <linux/slab.h>
29 #include <linux/time.h>
30 #include <linux/vmalloc.h>
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include "pcm_plugin.h"
35
36 #define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
37 #define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
38
39 static int snd_pcm_plugin_src_channels_mask(struct snd_pcm_plugin *plugin,
40 unsigned long *dst_vmask,
41 unsigned long **src_vmask)
42 {
43 unsigned long *vmask = plugin->src_vmask;
44 bitmap_copy(vmask, dst_vmask, plugin->src_format.channels);
45 *src_vmask = vmask;
46 return 0;
47 }
48
49 static int snd_pcm_plugin_dst_channels_mask(struct snd_pcm_plugin *plugin,
50 unsigned long *src_vmask,
51 unsigned long **dst_vmask)
52 {
53 unsigned long *vmask = plugin->dst_vmask;
54 bitmap_copy(vmask, src_vmask, plugin->dst_format.channels);
55 *dst_vmask = vmask;
56 return 0;
57 }
58
59 /*
60 * because some cards might have rates "very close", we ignore
61 * all "resampling" requests within +-5%
62 */
63 static int rate_match(unsigned int src_rate, unsigned int dst_rate)
64 {
65 unsigned int low = (src_rate * 95) / 100;
66 unsigned int high = (src_rate * 105) / 100;
67 return dst_rate >= low && dst_rate <= high;
68 }
69
70 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
71 {
72 struct snd_pcm_plugin_format *format;
73 ssize_t width;
74 size_t size;
75 unsigned int channel;
76 struct snd_pcm_plugin_channel *c;
77
78 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
79 format = &plugin->src_format;
80 } else {
81 format = &plugin->dst_format;
82 }
83 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
84 return width;
85 size = frames * format->channels * width;
86 snd_assert((size % 8) == 0, return -ENXIO);
87 size /= 8;
88 if (plugin->buf_frames < frames) {
89 vfree(plugin->buf);
90 plugin->buf = vmalloc(size);
91 plugin->buf_frames = frames;
92 }
93 if (!plugin->buf) {
94 plugin->buf_frames = 0;
95 return -ENOMEM;
96 }
97 c = plugin->buf_channels;
98 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
99 for (channel = 0; channel < format->channels; channel++, c++) {
100 c->frames = frames;
101 c->enabled = 1;
102 c->wanted = 0;
103 c->area.addr = plugin->buf;
104 c->area.first = channel * width;
105 c->area.step = format->channels * width;
106 }
107 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
108 snd_assert((size % format->channels) == 0,);
109 size /= format->channels;
110 for (channel = 0; channel < format->channels; channel++, c++) {
111 c->frames = frames;
112 c->enabled = 1;
113 c->wanted = 0;
114 c->area.addr = plugin->buf + (channel * size);
115 c->area.first = 0;
116 c->area.step = width;
117 }
118 } else
119 return -EINVAL;
120 return 0;
121 }
122
123 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
124 {
125 int err;
126 snd_assert(snd_pcm_plug_first(plug) != NULL, return -ENXIO);
127 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
128 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
129 while (plugin->next) {
130 if (plugin->dst_frames)
131 frames = plugin->dst_frames(plugin, frames);
132 snd_assert(frames > 0, return -ENXIO);
133 plugin = plugin->next;
134 err = snd_pcm_plugin_alloc(plugin, frames);
135 if (err < 0)
136 return err;
137 }
138 } else {
139 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
140 while (plugin->prev) {
141 if (plugin->src_frames)
142 frames = plugin->src_frames(plugin, frames);
143 snd_assert(frames > 0, return -ENXIO);
144 plugin = plugin->prev;
145 err = snd_pcm_plugin_alloc(plugin, frames);
146 if (err < 0)
147 return err;
148 }
149 }
150 return 0;
151 }
152
153
154 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
155 snd_pcm_uframes_t frames,
156 struct snd_pcm_plugin_channel **channels)
157 {
158 *channels = plugin->buf_channels;
159 return frames;
160 }
161
162 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
163 const char *name,
164 struct snd_pcm_plugin_format *src_format,
165 struct snd_pcm_plugin_format *dst_format,
166 size_t extra,
167 struct snd_pcm_plugin **ret)
168 {
169 struct snd_pcm_plugin *plugin;
170 unsigned int channels;
171
172 snd_assert(plug != NULL, return -ENXIO);
173 snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);
174 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
175 if (plugin == NULL)
176 return -ENOMEM;
177 plugin->name = name;
178 plugin->plug = plug;
179 plugin->stream = snd_pcm_plug_stream(plug);
180 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
181 plugin->src_format = *src_format;
182 plugin->src_width = snd_pcm_format_physical_width(src_format->format);
183 snd_assert(plugin->src_width > 0, );
184 plugin->dst_format = *dst_format;
185 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
186 snd_assert(plugin->dst_width > 0, );
187 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
188 channels = src_format->channels;
189 else
190 channels = dst_format->channels;
191 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
192 if (plugin->buf_channels == NULL) {
193 snd_pcm_plugin_free(plugin);
194 return -ENOMEM;
195 }
196 plugin->src_vmask = bitmap_alloc(src_format->channels);
197 if (plugin->src_vmask == NULL) {
198 snd_pcm_plugin_free(plugin);
199 return -ENOMEM;
200 }
201 plugin->dst_vmask = bitmap_alloc(dst_format->channels);
202 if (plugin->dst_vmask == NULL) {
203 snd_pcm_plugin_free(plugin);
204 return -ENOMEM;
205 }
206 plugin->client_channels = snd_pcm_plugin_client_channels;
207 plugin->src_channels_mask = snd_pcm_plugin_src_channels_mask;
208 plugin->dst_channels_mask = snd_pcm_plugin_dst_channels_mask;
209 *ret = plugin;
210 return 0;
211 }
212
213 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
214 {
215 if (! plugin)
216 return 0;
217 if (plugin->private_free)
218 plugin->private_free(plugin);
219 kfree(plugin->buf_channels);
220 vfree(plugin->buf);
221 kfree(plugin->src_vmask);
222 kfree(plugin->dst_vmask);
223 kfree(plugin);
224 return 0;
225 }
226
227 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
228 {
229 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
230 int stream = snd_pcm_plug_stream(plug);
231
232 snd_assert(plug != NULL, return -ENXIO);
233 if (drv_frames == 0)
234 return 0;
235 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
236 plugin = snd_pcm_plug_last(plug);
237 while (plugin && drv_frames > 0) {
238 plugin_prev = plugin->prev;
239 if (plugin->src_frames)
240 drv_frames = plugin->src_frames(plugin, drv_frames);
241 plugin = plugin_prev;
242 }
243 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
244 plugin = snd_pcm_plug_first(plug);
245 while (plugin && drv_frames > 0) {
246 plugin_next = plugin->next;
247 if (plugin->dst_frames)
248 drv_frames = plugin->dst_frames(plugin, drv_frames);
249 plugin = plugin_next;
250 }
251 } else
252 snd_BUG();
253 return drv_frames;
254 }
255
256 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
257 {
258 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
259 snd_pcm_sframes_t frames;
260 int stream = snd_pcm_plug_stream(plug);
261
262 snd_assert(plug != NULL, return -ENXIO);
263 if (clt_frames == 0)
264 return 0;
265 frames = clt_frames;
266 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
267 plugin = snd_pcm_plug_first(plug);
268 while (plugin && frames > 0) {
269 plugin_next = plugin->next;
270 if (plugin->dst_frames) {
271 frames = plugin->dst_frames(plugin, frames);
272 if (frames < 0)
273 return frames;
274 }
275 plugin = plugin_next;
276 }
277 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
278 plugin = snd_pcm_plug_last(plug);
279 while (plugin) {
280 plugin_prev = plugin->prev;
281 if (plugin->src_frames) {
282 frames = plugin->src_frames(plugin, frames);
283 if (frames < 0)
284 return frames;
285 }
286 plugin = plugin_prev;
287 }
288 } else
289 snd_BUG();
290 return frames;
291 }
292
293 static int snd_pcm_plug_formats(struct snd_mask *mask, int format)
294 {
295 struct snd_mask formats = *mask;
296 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
297 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
298 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
299 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
300 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
301 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
302 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
303 snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);
304
305 if (formats.bits[0] & (u32)linfmts)
306 formats.bits[0] |= (u32)linfmts;
307 if (formats.bits[1] & (u32)(linfmts >> 32))
308 formats.bits[1] |= (u32)(linfmts >> 32);
309 return snd_mask_test(&formats, format);
310 }
311
312 static int preferred_formats[] = {
313 SNDRV_PCM_FORMAT_S16_LE,
314 SNDRV_PCM_FORMAT_S16_BE,
315 SNDRV_PCM_FORMAT_U16_LE,
316 SNDRV_PCM_FORMAT_U16_BE,
317 SNDRV_PCM_FORMAT_S24_LE,
318 SNDRV_PCM_FORMAT_S24_BE,
319 SNDRV_PCM_FORMAT_U24_LE,
320 SNDRV_PCM_FORMAT_U24_BE,
321 SNDRV_PCM_FORMAT_S32_LE,
322 SNDRV_PCM_FORMAT_S32_BE,
323 SNDRV_PCM_FORMAT_U32_LE,
324 SNDRV_PCM_FORMAT_U32_BE,
325 SNDRV_PCM_FORMAT_S8,
326 SNDRV_PCM_FORMAT_U8
327 };
328
329 int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask)
330 {
331 if (snd_mask_test(format_mask, format))
332 return format;
333 if (! snd_pcm_plug_formats(format_mask, format))
334 return -EINVAL;
335 if (snd_pcm_format_linear(format)) {
336 int width = snd_pcm_format_width(format);
337 int unsignd = snd_pcm_format_unsigned(format);
338 int big = snd_pcm_format_big_endian(format);
339 int format1;
340 int wid, width1=width;
341 int dwidth1 = 8;
342 for (wid = 0; wid < 4; ++wid) {
343 int end, big1 = big;
344 for (end = 0; end < 2; ++end) {
345 int sgn, unsignd1 = unsignd;
346 for (sgn = 0; sgn < 2; ++sgn) {
347 format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);
348 if (format1 >= 0 &&
349 snd_mask_test(format_mask, format1))
350 goto _found;
351 unsignd1 = !unsignd1;
352 }
353 big1 = !big1;
354 }
355 if (width1 == 32) {
356 dwidth1 = -dwidth1;
357 width1 = width;
358 }
359 width1 += dwidth1;
360 }
361 return -EINVAL;
362 _found:
363 return format1;
364 } else {
365 unsigned int i;
366 switch (format) {
367 case SNDRV_PCM_FORMAT_MU_LAW:
368 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
369 int format1 = preferred_formats[i];
370 if (snd_mask_test(format_mask, format1))
371 return format1;
372 }
373 default:
374 return -EINVAL;
375 }
376 }
377 }
378
379 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
380 struct snd_pcm_hw_params *params,
381 struct snd_pcm_hw_params *slave_params)
382 {
383 struct snd_pcm_plugin_format tmpformat;
384 struct snd_pcm_plugin_format dstformat;
385 struct snd_pcm_plugin_format srcformat;
386 int src_access, dst_access;
387 struct snd_pcm_plugin *plugin = NULL;
388 int err;
389 int stream = snd_pcm_plug_stream(plug);
390 int slave_interleaved = (params_channels(slave_params) == 1 ||
391 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
392
393 switch (stream) {
394 case SNDRV_PCM_STREAM_PLAYBACK:
395 dstformat.format = params_format(slave_params);
396 dstformat.rate = params_rate(slave_params);
397 dstformat.channels = params_channels(slave_params);
398 srcformat.format = params_format(params);
399 srcformat.rate = params_rate(params);
400 srcformat.channels = params_channels(params);
401 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
402 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
403 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
404 break;
405 case SNDRV_PCM_STREAM_CAPTURE:
406 dstformat.format = params_format(params);
407 dstformat.rate = params_rate(params);
408 dstformat.channels = params_channels(params);
409 srcformat.format = params_format(slave_params);
410 srcformat.rate = params_rate(slave_params);
411 srcformat.channels = params_channels(slave_params);
412 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
413 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
414 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
415 break;
416 default:
417 snd_BUG();
418 return -EINVAL;
419 }
420 tmpformat = srcformat;
421
422 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
423 srcformat.format,
424 srcformat.rate,
425 srcformat.channels);
426 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
427 dstformat.format,
428 dstformat.rate,
429 dstformat.channels);
430
431 /* Format change (linearization) */
432 if ((srcformat.format != dstformat.format ||
433 !rate_match(srcformat.rate, dstformat.rate) ||
434 srcformat.channels != dstformat.channels) &&
435 !snd_pcm_format_linear(srcformat.format)) {
436 if (snd_pcm_format_linear(dstformat.format))
437 tmpformat.format = dstformat.format;
438 else
439 tmpformat.format = SNDRV_PCM_FORMAT_S16;
440 switch (srcformat.format) {
441 case SNDRV_PCM_FORMAT_MU_LAW:
442 err = snd_pcm_plugin_build_mulaw(plug,
443 &srcformat, &tmpformat,
444 &plugin);
445 break;
446 default:
447 return -EINVAL;
448 }
449 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
450 if (err < 0)
451 return err;
452 err = snd_pcm_plugin_append(plugin);
453 if (err < 0) {
454 snd_pcm_plugin_free(plugin);
455 return err;
456 }
457 srcformat = tmpformat;
458 src_access = dst_access;
459 }
460
461 /* channels reduction */
462 if (srcformat.channels > dstformat.channels) {
463 int sv = srcformat.channels;
464 int dv = dstformat.channels;
465 int *ttable = kcalloc(dv * sv, sizeof(*ttable), GFP_KERNEL);
466 if (ttable == NULL)
467 return -ENOMEM;
468 #if 1
469 if (sv == 2 && dv == 1) {
470 ttable[0] = HALF;
471 ttable[1] = HALF;
472 } else
473 #endif
474 {
475 int v;
476 for (v = 0; v < dv; ++v)
477 ttable[v * sv + v] = FULL;
478 }
479 tmpformat.channels = dstformat.channels;
480 if (rate_match(srcformat.rate, dstformat.rate) &&
481 snd_pcm_format_linear(dstformat.format))
482 tmpformat.format = dstformat.format;
483 err = snd_pcm_plugin_build_route(plug,
484 &srcformat, &tmpformat,
485 ttable, &plugin);
486 kfree(ttable);
487 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
488 if (err < 0) {
489 snd_pcm_plugin_free(plugin);
490 return err;
491 }
492 err = snd_pcm_plugin_append(plugin);
493 if (err < 0) {
494 snd_pcm_plugin_free(plugin);
495 return err;
496 }
497 srcformat = tmpformat;
498 src_access = dst_access;
499 }
500
501 /* rate resampling */
502 if (!rate_match(srcformat.rate, dstformat.rate)) {
503 tmpformat.rate = dstformat.rate;
504 if (srcformat.channels == dstformat.channels &&
505 snd_pcm_format_linear(dstformat.format))
506 tmpformat.format = dstformat.format;
507 err = snd_pcm_plugin_build_rate(plug,
508 &srcformat, &tmpformat,
509 &plugin);
510 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
511 if (err < 0) {
512 snd_pcm_plugin_free(plugin);
513 return err;
514 }
515 err = snd_pcm_plugin_append(plugin);
516 if (err < 0) {
517 snd_pcm_plugin_free(plugin);
518 return err;
519 }
520 srcformat = tmpformat;
521 src_access = dst_access;
522 }
523
524 /* channels extension */
525 if (srcformat.channels < dstformat.channels) {
526 int sv = srcformat.channels;
527 int dv = dstformat.channels;
528 int *ttable = kcalloc(dv * sv, sizeof(*ttable), GFP_KERNEL);
529 if (ttable == NULL)
530 return -ENOMEM;
531 #if 0
532 {
533 int v;
534 for (v = 0; v < sv; ++v)
535 ttable[v * sv + v] = FULL;
536 }
537 #else
538 {
539 /* Playback is spreaded on all channels */
540 int vd, vs;
541 for (vd = 0, vs = 0; vd < dv; ++vd) {
542 ttable[vd * sv + vs] = FULL;
543 vs++;
544 if (vs == sv)
545 vs = 0;
546 }
547 }
548 #endif
549 tmpformat.channels = dstformat.channels;
550 if (snd_pcm_format_linear(dstformat.format))
551 tmpformat.format = dstformat.format;
552 err = snd_pcm_plugin_build_route(plug,
553 &srcformat, &tmpformat,
554 ttable, &plugin);
555 kfree(ttable);
556 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
557 if (err < 0) {
558 snd_pcm_plugin_free(plugin);
559 return err;
560 }
561 err = snd_pcm_plugin_append(plugin);
562 if (err < 0) {
563 snd_pcm_plugin_free(plugin);
564 return err;
565 }
566 srcformat = tmpformat;
567 src_access = dst_access;
568 }
569
570 /* format change */
571 if (srcformat.format != dstformat.format) {
572 tmpformat.format = dstformat.format;
573 if (tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
574 err = snd_pcm_plugin_build_mulaw(plug,
575 &srcformat, &tmpformat,
576 &plugin);
577 }
578 else if (snd_pcm_format_linear(srcformat.format) &&
579 snd_pcm_format_linear(tmpformat.format)) {
580 err = snd_pcm_plugin_build_linear(plug,
581 &srcformat, &tmpformat,
582 &plugin);
583 }
584 else
585 return -EINVAL;
586 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
587 if (err < 0)
588 return err;
589 err = snd_pcm_plugin_append(plugin);
590 if (err < 0) {
591 snd_pcm_plugin_free(plugin);
592 return err;
593 }
594 srcformat = tmpformat;
595 src_access = dst_access;
596 }
597
598 /* de-interleave */
599 if (src_access != dst_access) {
600 err = snd_pcm_plugin_build_copy(plug,
601 &srcformat,
602 &tmpformat,
603 &plugin);
604 pdprintf("interleave change (copy: returns %i)\n", err);
605 if (err < 0)
606 return err;
607 err = snd_pcm_plugin_append(plugin);
608 if (err < 0) {
609 snd_pcm_plugin_free(plugin);
610 return err;
611 }
612 }
613
614 return 0;
615 }
616
617 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
618 char *buf,
619 snd_pcm_uframes_t count,
620 struct snd_pcm_plugin_channel **channels)
621 {
622 struct snd_pcm_plugin *plugin;
623 struct snd_pcm_plugin_channel *v;
624 struct snd_pcm_plugin_format *format;
625 int width, nchannels, channel;
626 int stream = snd_pcm_plug_stream(plug);
627
628 snd_assert(buf != NULL, return -ENXIO);
629 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
630 plugin = snd_pcm_plug_first(plug);
631 format = &plugin->src_format;
632 } else {
633 plugin = snd_pcm_plug_last(plug);
634 format = &plugin->dst_format;
635 }
636 v = plugin->buf_channels;
637 *channels = v;
638 if ((width = snd_pcm_format_physical_width(format->format)) < 0)
639 return width;
640 nchannels = format->channels;
641 snd_assert(plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || format->channels <= 1, return -ENXIO);
642 for (channel = 0; channel < nchannels; channel++, v++) {
643 v->frames = count;
644 v->enabled = 1;
645 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
646 v->area.addr = buf;
647 v->area.first = channel * width;
648 v->area.step = nchannels * width;
649 }
650 return count;
651 }
652
653 static int snd_pcm_plug_playback_channels_mask(struct snd_pcm_substream *plug,
654 unsigned long *client_vmask)
655 {
656 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
657 if (plugin == NULL) {
658 return 0;
659 } else {
660 int schannels = plugin->dst_format.channels;
661 DECLARE_BITMAP(bs, schannels);
662 unsigned long *srcmask;
663 unsigned long *dstmask = bs;
664 int err;
665 bitmap_fill(dstmask, schannels);
666
667 while (1) {
668 err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
669 if (err < 0)
670 return err;
671 dstmask = srcmask;
672 if (plugin->prev == NULL)
673 break;
674 plugin = plugin->prev;
675 }
676 bitmap_and(client_vmask, client_vmask, dstmask, plugin->src_format.channels);
677 return 0;
678 }
679 }
680
681 static int snd_pcm_plug_playback_disable_useless_channels(struct snd_pcm_substream *plug,
682 struct snd_pcm_plugin_channel *src_channels)
683 {
684 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
685 unsigned int nchannels = plugin->src_format.channels;
686 DECLARE_BITMAP(bs, nchannels);
687 unsigned long *srcmask = bs;
688 int err;
689 unsigned int channel;
690 for (channel = 0; channel < nchannels; channel++) {
691 if (src_channels[channel].enabled)
692 set_bit(channel, srcmask);
693 else
694 clear_bit(channel, srcmask);
695 }
696 err = snd_pcm_plug_playback_channels_mask(plug, srcmask);
697 if (err < 0)
698 return err;
699 for (channel = 0; channel < nchannels; channel++) {
700 if (!test_bit(channel, srcmask))
701 src_channels[channel].enabled = 0;
702 }
703 return 0;
704 }
705
706 static int snd_pcm_plug_capture_disable_useless_channels(struct snd_pcm_substream *plug,
707 struct snd_pcm_plugin_channel *src_channels,
708 struct snd_pcm_plugin_channel *client_channels)
709 {
710 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
711 unsigned int nchannels = plugin->dst_format.channels;
712 DECLARE_BITMAP(bs, nchannels);
713 unsigned long *dstmask = bs;
714 unsigned long *srcmask;
715 int err;
716 unsigned int channel;
717 for (channel = 0; channel < nchannels; channel++) {
718 if (client_channels[channel].enabled)
719 set_bit(channel, dstmask);
720 else
721 clear_bit(channel, dstmask);
722 }
723 while (plugin) {
724 err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
725 if (err < 0)
726 return err;
727 dstmask = srcmask;
728 plugin = plugin->prev;
729 }
730 plugin = snd_pcm_plug_first(plug);
731 nchannels = plugin->src_format.channels;
732 for (channel = 0; channel < nchannels; channel++) {
733 if (!test_bit(channel, dstmask))
734 src_channels[channel].enabled = 0;
735 }
736 return 0;
737 }
738
739 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)
740 {
741 struct snd_pcm_plugin *plugin, *next;
742 struct snd_pcm_plugin_channel *dst_channels;
743 int err;
744 snd_pcm_sframes_t frames = size;
745
746 if ((err = snd_pcm_plug_playback_disable_useless_channels(plug, src_channels)) < 0)
747 return err;
748
749 plugin = snd_pcm_plug_first(plug);
750 while (plugin && frames > 0) {
751 if ((next = plugin->next) != NULL) {
752 snd_pcm_sframes_t frames1 = frames;
753 if (plugin->dst_frames)
754 frames1 = plugin->dst_frames(plugin, frames);
755 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
756 return err;
757 }
758 if (err != frames1) {
759 frames = err;
760 if (plugin->src_frames)
761 frames = plugin->src_frames(plugin, frames1);
762 }
763 } else
764 dst_channels = NULL;
765 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
766 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
767 return frames;
768 src_channels = dst_channels;
769 plugin = next;
770 }
771 return snd_pcm_plug_client_size(plug, frames);
772 }
773
774 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)
775 {
776 struct snd_pcm_plugin *plugin, *next;
777 struct snd_pcm_plugin_channel *src_channels, *dst_channels;
778 snd_pcm_sframes_t frames = size;
779 int err;
780
781 frames = snd_pcm_plug_slave_size(plug, frames);
782 if (frames < 0)
783 return frames;
784
785 src_channels = NULL;
786 plugin = snd_pcm_plug_first(plug);
787 while (plugin && frames > 0) {
788 if ((next = plugin->next) != NULL) {
789 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
790 return err;
791 }
792 frames = err;
793 if (!plugin->prev) {
794 if ((err = snd_pcm_plug_capture_disable_useless_channels(plug, dst_channels, dst_channels_final)) < 0)
795 return err;
796 }
797 } else {
798 dst_channels = dst_channels_final;
799 }
800 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
801 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
802 return frames;
803 plugin = next;
804 src_channels = dst_channels;
805 }
806 return frames;
807 }
808
809 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
810 size_t samples, int format)
811 {
812 /* FIXME: sub byte resolution and odd dst_offset */
813 unsigned char *dst;
814 unsigned int dst_step;
815 int width;
816 const unsigned char *silence;
817 if (!dst_area->addr)
818 return 0;
819 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
820 width = snd_pcm_format_physical_width(format);
821 if (width <= 0)
822 return -EINVAL;
823 if (dst_area->step == (unsigned int) width && width >= 8)
824 return snd_pcm_format_set_silence(format, dst, samples);
825 silence = snd_pcm_format_silence_64(format);
826 if (! silence)
827 return -EINVAL;
828 dst_step = dst_area->step / 8;
829 if (width == 4) {
830 /* Ima ADPCM */
831 int dstbit = dst_area->first % 8;
832 int dstbit_step = dst_area->step % 8;
833 while (samples-- > 0) {
834 if (dstbit)
835 *dst &= 0xf0;
836 else
837 *dst &= 0x0f;
838 dst += dst_step;
839 dstbit += dstbit_step;
840 if (dstbit == 8) {
841 dst++;
842 dstbit = 0;
843 }
844 }
845 } else {
846 width /= 8;
847 while (samples-- > 0) {
848 memcpy(dst, silence, width);
849 dst += dst_step;
850 }
851 }
852 return 0;
853 }
854
855 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
856 const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
857 size_t samples, int format)
858 {
859 /* FIXME: sub byte resolution and odd dst_offset */
860 char *src, *dst;
861 int width;
862 int src_step, dst_step;
863 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
864 if (!src_area->addr)
865 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
866 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
867 if (!dst_area->addr)
868 return 0;
869 width = snd_pcm_format_physical_width(format);
870 if (width <= 0)
871 return -EINVAL;
872 if (src_area->step == (unsigned int) width &&
873 dst_area->step == (unsigned int) width && width >= 8) {
874 size_t bytes = samples * width / 8;
875 memcpy(dst, src, bytes);
876 return 0;
877 }
878 src_step = src_area->step / 8;
879 dst_step = dst_area->step / 8;
880 if (width == 4) {
881 /* Ima ADPCM */
882 int srcbit = src_area->first % 8;
883 int srcbit_step = src_area->step % 8;
884 int dstbit = dst_area->first % 8;
885 int dstbit_step = dst_area->step % 8;
886 while (samples-- > 0) {
887 unsigned char srcval;
888 if (srcbit)
889 srcval = *src & 0x0f;
890 else
891 srcval = (*src & 0xf0) >> 4;
892 if (dstbit)
893 *dst = (*dst & 0xf0) | srcval;
894 else
895 *dst = (*dst & 0x0f) | (srcval << 4);
896 src += src_step;
897 srcbit += srcbit_step;
898 if (srcbit == 8) {
899 src++;
900 srcbit = 0;
901 }
902 dst += dst_step;
903 dstbit += dstbit_step;
904 if (dstbit == 8) {
905 dst++;
906 dstbit = 0;
907 }
908 }
909 } else {
910 width /= 8;
911 while (samples-- > 0) {
912 memcpy(dst, src, width);
913 src += src_step;
914 dst += dst_step;
915 }
916 }
917 return 0;
918 }
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