git.oblomov.eu Git - linux-2.6/blob - 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 = 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 = 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 }