25dcf96a5dc669e324c0f40056da5be53fb04819
[linux-2.6.git] / sound / core / oss / pcm_plugin.c
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 /*
40  *  because some cards might have rates "very close", we ignore
41  *  all "resampling" requests within +-5%
42  */
43 static int rate_match(unsigned int src_rate, unsigned int dst_rate)
44 {
45         unsigned int low = (src_rate * 95) / 100;
46         unsigned int high = (src_rate * 105) / 100;
47         return dst_rate >= low && dst_rate <= high;
48 }
49
50 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
51 {
52         struct snd_pcm_plugin_format *format;
53         ssize_t width;
54         size_t size;
55         unsigned int channel;
56         struct snd_pcm_plugin_channel *c;
57
58         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
59                 format = &plugin->src_format;
60         } else {
61                 format = &plugin->dst_format;
62         }
63         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
64                 return width;
65         size = frames * format->channels * width;
66         snd_assert((size % 8) == 0, 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                 snd_assert((size % format->channels) == 0,);
89                 size /= format->channels;
90                 for (channel = 0; channel < format->channels; channel++, c++) {
91                         c->frames = frames;
92                         c->enabled = 1;
93                         c->wanted = 0;
94                         c->area.addr = plugin->buf + (channel * size);
95                         c->area.first = 0;
96                         c->area.step = width;
97                 }
98         } else
99                 return -EINVAL;
100         return 0;
101 }
102
103 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
104 {
105         int err;
106         snd_assert(snd_pcm_plug_first(plug) != NULL, return -ENXIO);
107         if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
108                 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
109                 while (plugin->next) {
110                         if (plugin->dst_frames)
111                                 frames = plugin->dst_frames(plugin, frames);
112                         snd_assert(frames > 0, return -ENXIO);
113                         plugin = plugin->next;
114                         err = snd_pcm_plugin_alloc(plugin, frames);
115                         if (err < 0)
116                                 return err;
117                 }
118         } else {
119                 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
120                 while (plugin->prev) {
121                         if (plugin->src_frames)
122                                 frames = plugin->src_frames(plugin, frames);
123                         snd_assert(frames > 0, return -ENXIO);
124                         plugin = plugin->prev;
125                         err = snd_pcm_plugin_alloc(plugin, frames);
126                         if (err < 0)
127                                 return err;
128                 }
129         }
130         return 0;
131 }
132
133
134 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
135                                        snd_pcm_uframes_t frames,
136                                        struct snd_pcm_plugin_channel **channels)
137 {
138         *channels = plugin->buf_channels;
139         return frames;
140 }
141
142 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
143                          const char *name,
144                          struct snd_pcm_plugin_format *src_format,
145                          struct snd_pcm_plugin_format *dst_format,
146                          size_t extra,
147                          struct snd_pcm_plugin **ret)
148 {
149         struct snd_pcm_plugin *plugin;
150         unsigned int channels;
151         
152         snd_assert(plug != NULL, return -ENXIO);
153         snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);
154         plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
155         if (plugin == NULL)
156                 return -ENOMEM;
157         plugin->name = name;
158         plugin->plug = plug;
159         plugin->stream = snd_pcm_plug_stream(plug);
160         plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
161         plugin->src_format = *src_format;
162         plugin->src_width = snd_pcm_format_physical_width(src_format->format);
163         snd_assert(plugin->src_width > 0, );
164         plugin->dst_format = *dst_format;
165         plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
166         snd_assert(plugin->dst_width > 0, );
167         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
168                 channels = src_format->channels;
169         else
170                 channels = dst_format->channels;
171         plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
172         if (plugin->buf_channels == NULL) {
173                 snd_pcm_plugin_free(plugin);
174                 return -ENOMEM;
175         }
176         plugin->client_channels = snd_pcm_plugin_client_channels;
177         *ret = plugin;
178         return 0;
179 }
180
181 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
182 {
183         if (! plugin)
184                 return 0;
185         if (plugin->private_free)
186                 plugin->private_free(plugin);
187         kfree(plugin->buf_channels);
188         vfree(plugin->buf);
189         kfree(plugin);
190         return 0;
191 }
192
193 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
194 {
195         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
196         int stream = snd_pcm_plug_stream(plug);
197
198         snd_assert(plug != NULL, return -ENXIO);
199         if (drv_frames == 0)
200                 return 0;
201         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
202                 plugin = snd_pcm_plug_last(plug);
203                 while (plugin && drv_frames > 0) {
204                         plugin_prev = plugin->prev;
205                         if (plugin->src_frames)
206                                 drv_frames = plugin->src_frames(plugin, drv_frames);
207                         plugin = plugin_prev;
208                 }
209         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
210                 plugin = snd_pcm_plug_first(plug);
211                 while (plugin && drv_frames > 0) {
212                         plugin_next = plugin->next;
213                         if (plugin->dst_frames)
214                                 drv_frames = plugin->dst_frames(plugin, drv_frames);
215                         plugin = plugin_next;
216                 }
217         } else
218                 snd_BUG();
219         return drv_frames;
220 }
221
222 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
223 {
224         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
225         snd_pcm_sframes_t frames;
226         int stream = snd_pcm_plug_stream(plug);
227         
228         snd_assert(plug != NULL, return -ENXIO);
229         if (clt_frames == 0)
230                 return 0;
231         frames = clt_frames;
232         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
233                 plugin = snd_pcm_plug_first(plug);
234                 while (plugin && frames > 0) {
235                         plugin_next = plugin->next;
236                         if (plugin->dst_frames) {
237                                 frames = plugin->dst_frames(plugin, frames);
238                                 if (frames < 0)
239                                         return frames;
240                         }
241                         plugin = plugin_next;
242                 }
243         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
244                 plugin = snd_pcm_plug_last(plug);
245                 while (plugin) {
246                         plugin_prev = plugin->prev;
247                         if (plugin->src_frames) {
248                                 frames = plugin->src_frames(plugin, frames);
249                                 if (frames < 0)
250                                         return frames;
251                         }
252                         plugin = plugin_prev;
253                 }
254         } else
255                 snd_BUG();
256         return frames;
257 }
258
259 static int snd_pcm_plug_formats(struct snd_mask *mask, int format)
260 {
261         struct snd_mask formats = *mask;
262         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
263                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
264                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
265                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
266                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
267                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
268                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
269                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
270                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
271         snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);
272         
273         if (formats.bits[0] & (u32)linfmts)
274                 formats.bits[0] |= (u32)linfmts;
275         if (formats.bits[1] & (u32)(linfmts >> 32))
276                 formats.bits[1] |= (u32)(linfmts >> 32);
277         return snd_mask_test(&formats, format);
278 }
279
280 static int preferred_formats[] = {
281         SNDRV_PCM_FORMAT_S16_LE,
282         SNDRV_PCM_FORMAT_S16_BE,
283         SNDRV_PCM_FORMAT_U16_LE,
284         SNDRV_PCM_FORMAT_U16_BE,
285         SNDRV_PCM_FORMAT_S24_3LE,
286         SNDRV_PCM_FORMAT_S24_3BE,
287         SNDRV_PCM_FORMAT_U24_3LE,
288         SNDRV_PCM_FORMAT_U24_3BE,
289         SNDRV_PCM_FORMAT_S24_LE,
290         SNDRV_PCM_FORMAT_S24_BE,
291         SNDRV_PCM_FORMAT_U24_LE,
292         SNDRV_PCM_FORMAT_U24_BE,
293         SNDRV_PCM_FORMAT_S32_LE,
294         SNDRV_PCM_FORMAT_S32_BE,
295         SNDRV_PCM_FORMAT_U32_LE,
296         SNDRV_PCM_FORMAT_U32_BE,
297         SNDRV_PCM_FORMAT_S8,
298         SNDRV_PCM_FORMAT_U8
299 };
300
301 int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask)
302 {
303         int i;
304
305         if (snd_mask_test(format_mask, format))
306                 return format;
307         if (! snd_pcm_plug_formats(format_mask, format))
308                 return -EINVAL;
309         if (snd_pcm_format_linear(format)) {
310                 unsigned int width = snd_pcm_format_width(format);
311                 int unsignd = snd_pcm_format_unsigned(format) > 0;
312                 int big = snd_pcm_format_big_endian(format) > 0;
313                 unsigned int badness, best = -1;
314                 int best_format = -1;
315                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
316                         int f = preferred_formats[i];
317                         unsigned int w;
318                         if (!snd_mask_test(format_mask, f))
319                                 continue;
320                         w = snd_pcm_format_width(f);
321                         if (w >= width)
322                                 badness = w - width;
323                         else
324                                 badness = width - w + 32;
325                         badness += snd_pcm_format_unsigned(f) != unsignd;
326                         badness += snd_pcm_format_big_endian(f) != big;
327                         if (badness < best) {
328                                 best_format = f;
329                                 best = badness;
330                         }
331                 }
332                 return best_format >= 0 ? best_format : -EINVAL;
333         } else {
334                 switch (format) {
335                 case SNDRV_PCM_FORMAT_MU_LAW:
336                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
337                                 int format1 = preferred_formats[i];
338                                 if (snd_mask_test(format_mask, format1))
339                                         return format1;
340                         }
341                 default:
342                         return -EINVAL;
343                 }
344         }
345 }
346
347 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
348                                 struct snd_pcm_hw_params *params,
349                                 struct snd_pcm_hw_params *slave_params)
350 {
351         struct snd_pcm_plugin_format tmpformat;
352         struct snd_pcm_plugin_format dstformat;
353         struct snd_pcm_plugin_format srcformat;
354         int src_access, dst_access;
355         struct snd_pcm_plugin *plugin = NULL;
356         int err;
357         int stream = snd_pcm_plug_stream(plug);
358         int slave_interleaved = (params_channels(slave_params) == 1 ||
359                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
360
361         switch (stream) {
362         case SNDRV_PCM_STREAM_PLAYBACK:
363                 dstformat.format = params_format(slave_params);
364                 dstformat.rate = params_rate(slave_params);
365                 dstformat.channels = params_channels(slave_params);
366                 srcformat.format = params_format(params);
367                 srcformat.rate = params_rate(params);
368                 srcformat.channels = params_channels(params);
369                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
370                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
371                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
372                 break;
373         case SNDRV_PCM_STREAM_CAPTURE:
374                 dstformat.format = params_format(params);
375                 dstformat.rate = params_rate(params);
376                 dstformat.channels = params_channels(params);
377                 srcformat.format = params_format(slave_params);
378                 srcformat.rate = params_rate(slave_params);
379                 srcformat.channels = params_channels(slave_params);
380                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
381                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
382                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
383                 break;
384         default:
385                 snd_BUG();
386                 return -EINVAL;
387         }
388         tmpformat = srcformat;
389                 
390         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 
391                  srcformat.format,
392                  srcformat.rate,
393                  srcformat.channels);
394         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 
395                  dstformat.format,
396                  dstformat.rate,
397                  dstformat.channels);
398
399         /* Format change (linearization) */
400         if (! rate_match(srcformat.rate, dstformat.rate) &&
401             ! snd_pcm_format_linear(srcformat.format)) {
402                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
403                         return -EINVAL;
404                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
405                 err = snd_pcm_plugin_build_mulaw(plug,
406                                                  &srcformat, &tmpformat,
407                                                  &plugin);
408                 if (err < 0)
409                         return err;
410                 err = snd_pcm_plugin_append(plugin);
411                 if (err < 0) {
412                         snd_pcm_plugin_free(plugin);
413                         return err;
414                 }
415                 srcformat = tmpformat;
416                 src_access = dst_access;
417         }
418
419         /* channels reduction */
420         if (srcformat.channels > dstformat.channels) {
421                 tmpformat.channels = dstformat.channels;
422                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
423                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
424                 if (err < 0)
425                         return err;
426                 err = snd_pcm_plugin_append(plugin);
427                 if (err < 0) {
428                         snd_pcm_plugin_free(plugin);
429                         return err;
430                 }
431                 srcformat = tmpformat;
432                 src_access = dst_access;
433         }
434
435         /* rate resampling */
436         if (!rate_match(srcformat.rate, dstformat.rate)) {
437                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
438                         /* convert to S16 for resampling */
439                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
440                         err = snd_pcm_plugin_build_linear(plug,
441                                                           &srcformat, &tmpformat,
442                                                           &plugin);
443                         if (err < 0)
444                                 return err;
445                         err = snd_pcm_plugin_append(plugin);
446                         if (err < 0) {
447                                 snd_pcm_plugin_free(plugin);
448                                 return err;
449                         }
450                         srcformat = tmpformat;
451                         src_access = dst_access;
452                 }
453                 tmpformat.rate = dstformat.rate;
454                 err = snd_pcm_plugin_build_rate(plug,
455                                                 &srcformat, &tmpformat,
456                                                 &plugin);
457                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
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
469         /* format change */
470         if (srcformat.format != dstformat.format) {
471                 tmpformat.format = dstformat.format;
472                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
473                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
474                         err = snd_pcm_plugin_build_mulaw(plug,
475                                                          &srcformat, &tmpformat,
476                                                          &plugin);
477                 }
478                 else if (snd_pcm_format_linear(srcformat.format) &&
479                          snd_pcm_format_linear(tmpformat.format)) {
480                         err = snd_pcm_plugin_build_linear(plug,
481                                                           &srcformat, &tmpformat,
482                                                           &plugin);
483                 }
484                 else
485                         return -EINVAL;
486                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
487                 if (err < 0)
488                         return err;
489                 err = snd_pcm_plugin_append(plugin);
490                 if (err < 0) {
491                         snd_pcm_plugin_free(plugin);
492                         return err;
493                 }
494                 srcformat = tmpformat;
495                 src_access = dst_access;
496         }
497
498         /* channels extension */
499         if (srcformat.channels < dstformat.channels) {
500                 tmpformat.channels = dstformat.channels;
501                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
502                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
503                 if (err < 0)
504                         return err;
505                 err = snd_pcm_plugin_append(plugin);
506                 if (err < 0) {
507                         snd_pcm_plugin_free(plugin);
508                         return err;
509                 }
510                 srcformat = tmpformat;
511                 src_access = dst_access;
512         }
513
514         /* de-interleave */
515         if (src_access != dst_access) {
516                 err = snd_pcm_plugin_build_copy(plug,
517                                                 &srcformat,
518                                                 &tmpformat,
519                                                 &plugin);
520                 pdprintf("interleave change (copy: returns %i)\n", err);
521                 if (err < 0)
522                         return err;
523                 err = snd_pcm_plugin_append(plugin);
524                 if (err < 0) {
525                         snd_pcm_plugin_free(plugin);
526                         return err;
527                 }
528         }
529
530         return 0;
531 }
532
533 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
534                                          char *buf,
535                                          snd_pcm_uframes_t count,
536                                          struct snd_pcm_plugin_channel **channels)
537 {
538         struct snd_pcm_plugin *plugin;
539         struct snd_pcm_plugin_channel *v;
540         struct snd_pcm_plugin_format *format;
541         int width, nchannels, channel;
542         int stream = snd_pcm_plug_stream(plug);
543
544         snd_assert(buf != NULL, return -ENXIO);
545         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
546                 plugin = snd_pcm_plug_first(plug);
547                 format = &plugin->src_format;
548         } else {
549                 plugin = snd_pcm_plug_last(plug);
550                 format = &plugin->dst_format;
551         }
552         v = plugin->buf_channels;
553         *channels = v;
554         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
555                 return width;
556         nchannels = format->channels;
557         snd_assert(plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || format->channels <= 1, return -ENXIO);
558         for (channel = 0; channel < nchannels; channel++, v++) {
559                 v->frames = count;
560                 v->enabled = 1;
561                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
562                 v->area.addr = buf;
563                 v->area.first = channel * width;
564                 v->area.step = nchannels * width;
565         }
566         return count;
567 }
568
569 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)
570 {
571         struct snd_pcm_plugin *plugin, *next;
572         struct snd_pcm_plugin_channel *dst_channels;
573         int err;
574         snd_pcm_sframes_t frames = size;
575
576         plugin = snd_pcm_plug_first(plug);
577         while (plugin && frames > 0) {
578                 if ((next = plugin->next) != NULL) {
579                         snd_pcm_sframes_t frames1 = frames;
580                         if (plugin->dst_frames)
581                                 frames1 = plugin->dst_frames(plugin, frames);
582                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
583                                 return err;
584                         }
585                         if (err != frames1) {
586                                 frames = err;
587                                 if (plugin->src_frames)
588                                         frames = plugin->src_frames(plugin, frames1);
589                         }
590                 } else
591                         dst_channels = NULL;
592                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
593                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
594                         return frames;
595                 src_channels = dst_channels;
596                 plugin = next;
597         }
598         return snd_pcm_plug_client_size(plug, frames);
599 }
600
601 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)
602 {
603         struct snd_pcm_plugin *plugin, *next;
604         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
605         snd_pcm_sframes_t frames = size;
606         int err;
607
608         frames = snd_pcm_plug_slave_size(plug, frames);
609         if (frames < 0)
610                 return frames;
611
612         src_channels = NULL;
613         plugin = snd_pcm_plug_first(plug);
614         while (plugin && frames > 0) {
615                 if ((next = plugin->next) != NULL) {
616                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
617                                 return err;
618                         }
619                         frames = err;
620                 } else {
621                         dst_channels = dst_channels_final;
622                 }
623                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
624                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
625                         return frames;
626                 plugin = next;
627                 src_channels = dst_channels;
628         }
629         return frames;
630 }
631
632 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
633                          size_t samples, int format)
634 {
635         /* FIXME: sub byte resolution and odd dst_offset */
636         unsigned char *dst;
637         unsigned int dst_step;
638         int width;
639         const unsigned char *silence;
640         if (!dst_area->addr)
641                 return 0;
642         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
643         width = snd_pcm_format_physical_width(format);
644         if (width <= 0)
645                 return -EINVAL;
646         if (dst_area->step == (unsigned int) width && width >= 8)
647                 return snd_pcm_format_set_silence(format, dst, samples);
648         silence = snd_pcm_format_silence_64(format);
649         if (! silence)
650                 return -EINVAL;
651         dst_step = dst_area->step / 8;
652         if (width == 4) {
653                 /* Ima ADPCM */
654                 int dstbit = dst_area->first % 8;
655                 int dstbit_step = dst_area->step % 8;
656                 while (samples-- > 0) {
657                         if (dstbit)
658                                 *dst &= 0xf0;
659                         else
660                                 *dst &= 0x0f;
661                         dst += dst_step;
662                         dstbit += dstbit_step;
663                         if (dstbit == 8) {
664                                 dst++;
665                                 dstbit = 0;
666                         }
667                 }
668         } else {
669                 width /= 8;
670                 while (samples-- > 0) {
671                         memcpy(dst, silence, width);
672                         dst += dst_step;
673                 }
674         }
675         return 0;
676 }
677
678 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
679                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
680                       size_t samples, int format)
681 {
682         /* FIXME: sub byte resolution and odd dst_offset */
683         char *src, *dst;
684         int width;
685         int src_step, dst_step;
686         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
687         if (!src_area->addr)
688                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
689         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
690         if (!dst_area->addr)
691                 return 0;
692         width = snd_pcm_format_physical_width(format);
693         if (width <= 0)
694                 return -EINVAL;
695         if (src_area->step == (unsigned int) width &&
696             dst_area->step == (unsigned int) width && width >= 8) {
697                 size_t bytes = samples * width / 8;
698                 memcpy(dst, src, bytes);
699                 return 0;
700         }
701         src_step = src_area->step / 8;
702         dst_step = dst_area->step / 8;
703         if (width == 4) {
704                 /* Ima ADPCM */
705                 int srcbit = src_area->first % 8;
706                 int srcbit_step = src_area->step % 8;
707                 int dstbit = dst_area->first % 8;
708                 int dstbit_step = dst_area->step % 8;
709                 while (samples-- > 0) {
710                         unsigned char srcval;
711                         if (srcbit)
712                                 srcval = *src & 0x0f;
713                         else
714                                 srcval = (*src & 0xf0) >> 4;
715                         if (dstbit)
716                                 *dst = (*dst & 0xf0) | srcval;
717                         else
718                                 *dst = (*dst & 0x0f) | (srcval << 4);
719                         src += src_step;
720                         srcbit += srcbit_step;
721                         if (srcbit == 8) {
722                                 src++;
723                                 srcbit = 0;
724                         }
725                         dst += dst_step;
726                         dstbit += dstbit_step;
727                         if (dstbit == 8) {
728                                 dst++;
729                                 dstbit = 0;
730                         }
731                 }
732         } else {
733                 width /= 8;
734                 while (samples-- > 0) {
735                         memcpy(dst, src, width);
736                         src += src_step;
737                         dst += dst_step;
738                 }
739         }
740         return 0;
741 }