[ALSA] kill dead code
[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 static int snd_pcm_plugin_src_channels_mask(snd_pcm_plugin_t *plugin,
40                                             bitset_t *dst_vmask,
41                                             bitset_t **src_vmask)
42 {
43         bitset_t *vmask = plugin->src_vmask;
44         bitset_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(snd_pcm_plugin_t *plugin,
50                                             bitset_t *src_vmask,
51                                             bitset_t **dst_vmask)
52 {
53         bitset_t *vmask = plugin->dst_vmask;
54         bitset_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(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t frames)
71 {
72         snd_pcm_plugin_format_t *format;
73         ssize_t width;
74         size_t size;
75         unsigned int channel;
76         snd_pcm_plugin_channel_t *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(snd_pcm_plug_t *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                 snd_pcm_plugin_t *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                 snd_pcm_plugin_t *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(snd_pcm_plugin_t *plugin,
155                                        snd_pcm_uframes_t frames,
156                                        snd_pcm_plugin_channel_t **channels)
157 {
158         *channels = plugin->buf_channels;
159         return frames;
160 }
161
162 int snd_pcm_plugin_build(snd_pcm_plug_t *plug,
163                          const char *name,
164                          snd_pcm_plugin_format_t *src_format,
165                          snd_pcm_plugin_format_t *dst_format,
166                          size_t extra,
167                          snd_pcm_plugin_t **ret)
168 {
169         snd_pcm_plugin_t *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 = kcalloc(1, 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 = bitset_alloc(src_format->channels);
197         if (plugin->src_vmask == NULL) {
198                 snd_pcm_plugin_free(plugin);
199                 return -ENOMEM;
200         }
201         plugin->dst_vmask = bitset_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(snd_pcm_plugin_t *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(snd_pcm_plug_t *plug, snd_pcm_uframes_t drv_frames)
228 {
229         snd_pcm_plugin_t *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(snd_pcm_plug_t *plug, snd_pcm_uframes_t clt_frames)
257 {
258         snd_pcm_plugin_t *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(snd_mask_t *mask, int format)
294 {
295         snd_mask_t 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, snd_mask_t *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(snd_pcm_plug_t *plug,
380                                 snd_pcm_hw_params_t *params,
381                                 snd_pcm_hw_params_t *slave_params)
382 {
383         snd_pcm_plugin_format_t tmpformat;
384         snd_pcm_plugin_format_t dstformat;
385         snd_pcm_plugin_format_t srcformat;
386         int src_access, dst_access;
387         snd_pcm_plugin_t *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                 route_ttable_entry_t *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                 route_ttable_entry_t *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(snd_pcm_plug_t *plug,
618                                          char *buf,
619                                          snd_pcm_uframes_t count,
620                                          snd_pcm_plugin_channel_t **channels)
621 {
622         snd_pcm_plugin_t *plugin;
623         snd_pcm_plugin_channel_t *v;
624         snd_pcm_plugin_format_t *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(snd_pcm_plug_t *plug,
654                                                bitset_t *client_vmask)
655 {
656         snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
657         if (plugin == NULL) {
658                 return 0;
659         } else {
660                 int schannels = plugin->dst_format.channels;
661                 bitset_t bs[bitset_size(schannels)];
662                 bitset_t *srcmask;
663                 bitset_t *dstmask = bs;
664                 int err;
665                 bitset_one(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                 bitset_and(client_vmask, dstmask, plugin->src_format.channels);
677                 return 0;
678         }
679 }
680
681 static int snd_pcm_plug_playback_disable_useless_channels(snd_pcm_plug_t *plug,
682                                                           snd_pcm_plugin_channel_t *src_channels)
683 {
684         snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
685         unsigned int nchannels = plugin->src_format.channels;
686         bitset_t bs[bitset_size(nchannels)];
687         bitset_t *srcmask = bs;
688         int err;
689         unsigned int channel;
690         for (channel = 0; channel < nchannels; channel++) {
691                 if (src_channels[channel].enabled)
692                         bitset_set(srcmask, channel);
693                 else
694                         bitset_reset(srcmask, channel);
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 (!bitset_get(srcmask, channel))
701                         src_channels[channel].enabled = 0;
702         }
703         return 0;
704 }
705
706 static int snd_pcm_plug_capture_disable_useless_channels(snd_pcm_plug_t *plug,
707                                                          snd_pcm_plugin_channel_t *src_channels,
708                                                          snd_pcm_plugin_channel_t *client_channels)
709 {
710         snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
711         unsigned int nchannels = plugin->dst_format.channels;
712         bitset_t bs[bitset_size(nchannels)];
713         bitset_t *dstmask = bs;
714         bitset_t *srcmask;
715         int err;
716         unsigned int channel;
717         for (channel = 0; channel < nchannels; channel++) {
718                 if (client_channels[channel].enabled)
719                         bitset_set(dstmask, channel);
720                 else
721                         bitset_reset(dstmask, channel);
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 (!bitset_get(dstmask, channel))
734                         src_channels[channel].enabled = 0;
735         }
736         return 0;
737 }
738
739 snd_pcm_sframes_t snd_pcm_plug_write_transfer(snd_pcm_plug_t *plug, snd_pcm_plugin_channel_t *src_channels, snd_pcm_uframes_t size)
740 {
741         snd_pcm_plugin_t *plugin, *next;
742         snd_pcm_plugin_channel_t *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(snd_pcm_plug_t *plug, snd_pcm_plugin_channel_t *dst_channels_final, snd_pcm_uframes_t size)
775 {
776         snd_pcm_plugin_t *plugin, *next;
777         snd_pcm_plugin_channel_t *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 snd_pcm_channel_area_t *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 snd_pcm_channel_area_t *src_area, size_t src_offset,
856                       const snd_pcm_channel_area_t *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 }