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                 if (plugin->buf)
  90                         vfree(plugin->buf);
  91                 plugin->buf = vmalloc(size);
  92                 plugin->buf_frames = frames;
  93         }
  94         if (!plugin->buf) {
  95                 plugin->buf_frames = 0;
  96                 return -ENOMEM;
  97         }
  98         c = plugin->buf_channels;
  99         if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
 100                 for (channel = 0; channel < format->channels; channel++, c++) {
 101                         c->frames = frames;
 102                         c->enabled = 1;
 103                         c->wanted = 0;
 104                         c->area.addr = plugin->buf;
 105                         c->area.first = channel * width;
 106                         c->area.step = format->channels * width;
 107                 }
 108         } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
 109                 snd_assert((size % format->channels) == 0,);
 110                 size /= format->channels;
 111                 for (channel = 0; channel < format->channels; channel++, c++) {
 112                         c->frames = frames;
 113                         c->enabled = 1;
 114                         c->wanted = 0;
 115                         c->area.addr = plugin->buf + (channel * size);
 116                         c->area.first = 0;
 117                         c->area.step = width;
 118                 }
 119         } else
 120                 return -EINVAL;
 121         return 0;
 122 }
 123
 124 int snd_pcm_plug_alloc(snd_pcm_plug_t *plug, snd_pcm_uframes_t frames)
 125 {
 126         int err;
 127         snd_assert(snd_pcm_plug_first(plug) != NULL, return -ENXIO);
 128         if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
 129                 snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
 130                 while (plugin->next) {
 131                         if (plugin->dst_frames)
 132                                 frames = plugin->dst_frames(plugin, frames);
 133                         snd_assert(frames > 0, return -ENXIO);
 134                         plugin = plugin->next;
 135                         err = snd_pcm_plugin_alloc(plugin, frames);
 136                         if (err < 0)
 137                                 return err;
 138                 }
 139         } else {
 140                 snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
 141                 while (plugin->prev) {
 142                         if (plugin->src_frames)
 143                                 frames = plugin->src_frames(plugin, frames);
 144                         snd_assert(frames > 0, return -ENXIO);
 145                         plugin = plugin->prev;
 146                         err = snd_pcm_plugin_alloc(plugin, frames);
 147                         if (err < 0)
 148                                 return err;
 149                 }
 150         }
 151         return 0;
 152 }
 153
 154
 155 snd_pcm_sframes_t snd_pcm_plugin_client_channels(snd_pcm_plugin_t *plugin,
 156                                        snd_pcm_uframes_t frames,
 157                                        snd_pcm_plugin_channel_t **channels)
 158 {
 159         *channels = plugin->buf_channels;
 160         return frames;
 161 }
 162
 163 int snd_pcm_plugin_build(snd_pcm_plug_t *plug,
 164                          const char *name,
 165                          snd_pcm_plugin_format_t *src_format,
 166                          snd_pcm_plugin_format_t *dst_format,
 167                          size_t extra,
 168                          snd_pcm_plugin_t **ret)
 169 {
 170         snd_pcm_plugin_t *plugin;
 171         unsigned int channels;
 172
 173         snd_assert(plug != NULL, return -ENXIO);
 174         snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);
 175         plugin = (snd_pcm_plugin_t *)snd_kcalloc(sizeof(*plugin) + extra, GFP_KERNEL);
 176         if (plugin == NULL)
 177                 return -ENOMEM;
 178         plugin->name = name;
 179         plugin->plug = plug;
 180         plugin->stream = snd_pcm_plug_stream(plug);
 181         plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 182         plugin->src_format = *src_format;
 183         plugin->src_width = snd_pcm_format_physical_width(src_format->format);
 184         snd_assert(plugin->src_width > 0, );
 185         plugin->dst_format = *dst_format;
 186         plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
 187         snd_assert(plugin->dst_width > 0, );
 188         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
 189                 channels = src_format->channels;
 190         else
 191                 channels = dst_format->channels;
 192         plugin->buf_channels = snd_kcalloc(channels * sizeof(*plugin->buf_channels), GFP_KERNEL);
 193         if (plugin->buf_channels == NULL) {
 194                 snd_pcm_plugin_free(plugin);
 195                 return -ENOMEM;
 196         }
 197         plugin->src_vmask = bitset_alloc(src_format->channels);
 198         if (plugin->src_vmask == NULL) {
 199                 snd_pcm_plugin_free(plugin);
 200                 return -ENOMEM;
 201         }
 202         plugin->dst_vmask = bitset_alloc(dst_format->channels);
 203         if (plugin->dst_vmask == NULL) {
 204                 snd_pcm_plugin_free(plugin);
 205                 return -ENOMEM;
 206         }
 207         plugin->client_channels = snd_pcm_plugin_client_channels;
 208         plugin->src_channels_mask = snd_pcm_plugin_src_channels_mask;
 209         plugin->dst_channels_mask = snd_pcm_plugin_dst_channels_mask;
 210         *ret = plugin;
 211         return 0;
 212 }
 213
 214 int snd_pcm_plugin_free(snd_pcm_plugin_t *plugin)
 215 {
 216         if (! plugin)
 217                 return 0;
 218         if (plugin->private_free)
 219                 plugin->private_free(plugin);
 220         if (plugin->buf_channels)
 221                 kfree(plugin->buf_channels);
 222         if (plugin->buf)
 223                 vfree(plugin->buf);
 224         if (plugin->src_vmask)
 225                 kfree(plugin->src_vmask);
 226         if (plugin->dst_vmask)
 227                 kfree(plugin->dst_vmask);
 228         kfree(plugin);
 229         return 0;
 230 }
 231
 232 snd_pcm_sframes_t snd_pcm_plug_client_size(snd_pcm_plug_t *plug, snd_pcm_uframes_t drv_frames)
 233 {
 234         snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;
 235         int stream = snd_pcm_plug_stream(plug);
 236
 237         snd_assert(plug != NULL, return -ENXIO);
 238         if (drv_frames == 0)
 239                 return 0;
 240         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 241                 plugin = snd_pcm_plug_last(plug);
 242                 while (plugin && drv_frames > 0) {
 243                         plugin_prev = plugin->prev;
 244                         if (plugin->src_frames)
 245                                 drv_frames = plugin->src_frames(plugin, drv_frames);
 246                         plugin = plugin_prev;
 247                 }
 248         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 249                 plugin = snd_pcm_plug_first(plug);
 250                 while (plugin && drv_frames > 0) {
 251                         plugin_next = plugin->next;
 252                         if (plugin->dst_frames)
 253                                 drv_frames = plugin->dst_frames(plugin, drv_frames);
 254                         plugin = plugin_next;
 255                 }
 256         } else
 257                 snd_BUG();
 258         return drv_frames;
 259 }
 260
 261 snd_pcm_sframes_t snd_pcm_plug_slave_size(snd_pcm_plug_t *plug, snd_pcm_uframes_t clt_frames)
 262 {
 263         snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;
 264         snd_pcm_sframes_t frames;
 265         int stream = snd_pcm_plug_stream(plug);
 266
 267         snd_assert(plug != NULL, return -ENXIO);
 268         if (clt_frames == 0)
 269                 return 0;
 270         frames = clt_frames;
 271         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 272                 plugin = snd_pcm_plug_first(plug);
 273                 while (plugin && frames > 0) {
 274                         plugin_next = plugin->next;
 275                         if (plugin->dst_frames) {
 276                                 frames = plugin->dst_frames(plugin, frames);
 277                                 if (frames < 0)
 278                                         return frames;
 279                         }
 280                         plugin = plugin_next;
 281                 }
 282         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 283                 plugin = snd_pcm_plug_last(plug);
 284                 while (plugin) {
 285                         plugin_prev = plugin->prev;
 286                         if (plugin->src_frames) {
 287                                 frames = plugin->src_frames(plugin, frames);
 288                                 if (frames < 0)
 289                                         return frames;
 290                         }
 291                         plugin = plugin_prev;
 292                 }
 293         } else
 294                 snd_BUG();
 295         return frames;
 296 }
 297
 298 static int snd_pcm_plug_formats(snd_mask_t *mask, int format)
 299 {
 300         snd_mask_t formats = *mask;
 301         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 302                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 303                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 304                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 305                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 306                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 307                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 308         snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);
 309
 310         if (formats.bits[0] & (u32)linfmts)
 311                 formats.bits[0] |= (u32)linfmts;
 312         if (formats.bits[1] & (u32)(linfmts >> 32))
 313                 formats.bits[1] |= (u32)(linfmts >> 32);
 314         return snd_mask_test(&formats, format);
 315 }
 316
 317 static int preferred_formats[] = {
 318         SNDRV_PCM_FORMAT_S16_LE,
 319         SNDRV_PCM_FORMAT_S16_BE,
 320         SNDRV_PCM_FORMAT_U16_LE,
 321         SNDRV_PCM_FORMAT_U16_BE,
 322         SNDRV_PCM_FORMAT_S24_LE,
 323         SNDRV_PCM_FORMAT_S24_BE,
 324         SNDRV_PCM_FORMAT_U24_LE,
 325         SNDRV_PCM_FORMAT_U24_BE,
 326         SNDRV_PCM_FORMAT_S32_LE,
 327         SNDRV_PCM_FORMAT_S32_BE,
 328         SNDRV_PCM_FORMAT_U32_LE,
 329         SNDRV_PCM_FORMAT_U32_BE,
 330         SNDRV_PCM_FORMAT_S8,
 331         SNDRV_PCM_FORMAT_U8
 332 };
 333
 334 int snd_pcm_plug_slave_format(int format, snd_mask_t *format_mask)
 335 {
 336         if (snd_mask_test(format_mask, format))
 337                 return format;
 338         if (! snd_pcm_plug_formats(format_mask, format))
 339                 return -EINVAL;
 340         if (snd_pcm_format_linear(format)) {
 341                 int width = snd_pcm_format_width(format);
 342                 int unsignd = snd_pcm_format_unsigned(format);
 343                 int big = snd_pcm_format_big_endian(format);
 344                 int format1;
 345                 int wid, width1=width;
 346                 int dwidth1 = 8;
 347                 for (wid = 0; wid < 4; ++wid) {
 348                         int end, big1 = big;
 349                         for (end = 0; end < 2; ++end) {
 350                                 int sgn, unsignd1 = unsignd;
 351                                 for (sgn = 0; sgn < 2; ++sgn) {
 352                                         format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);
 353                                         if (format1 >= 0 &&
 354                                             snd_mask_test(format_mask, format1))
 355                                                 goto _found;
 356                                         unsignd1 = !unsignd1;
 357                                 }
 358                                 big1 = !big1;
 359                         }
 360                         if (width1 == 32) {
 361                                 dwidth1 = -dwidth1;
 362                                 width1 = width;
 363                         }
 364                         width1 += dwidth1;
 365                 }
 366                 return -EINVAL;
 367         _found:
 368                 return format1;
 369         } else {
 370                 unsigned int i;
 371                 switch (format) {
 372                 case SNDRV_PCM_FORMAT_MU_LAW:
 373                         for (i = 0; i < sizeof(preferred_formats) / sizeof(preferred_formats[0]); ++i) {
 374                                 int format1 = preferred_formats[i];
 375                                 if (snd_mask_test(format_mask, format1))
 376                                         return format1;
 377                         }
 378                 default:
 379                         return -EINVAL;
 380                 }
 381         }
 382 }
 383
 384 int snd_pcm_plug_format_plugins(snd_pcm_plug_t *plug,
 385                                 snd_pcm_hw_params_t *params,
 386                                 snd_pcm_hw_params_t *slave_params)
 387 {
 388         snd_pcm_plugin_format_t tmpformat;
 389         snd_pcm_plugin_format_t dstformat;
 390         snd_pcm_plugin_format_t srcformat;
 391         int src_access, dst_access;
 392         snd_pcm_plugin_t *plugin = NULL;
 393         int err, first;
 394         int stream = snd_pcm_plug_stream(plug);
 395         int slave_interleaved = (params_channels(slave_params) == 1 ||
 396                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 397
 398         switch (stream) {
 399         case SNDRV_PCM_STREAM_PLAYBACK:
 400                 dstformat.format = params_format(slave_params);
 401                 dstformat.rate = params_rate(slave_params);
 402                 dstformat.channels = params_channels(slave_params);
 403                 srcformat.format = params_format(params);
 404                 srcformat.rate = params_rate(params);
 405                 srcformat.channels = params_channels(params);
 406                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 407                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 408                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 409                 break;
 410         case SNDRV_PCM_STREAM_CAPTURE:
 411                 dstformat.format = params_format(params);
 412                 dstformat.rate = params_rate(params);
 413                 dstformat.channels = params_channels(params);
 414                 srcformat.format = params_format(slave_params);
 415                 srcformat.rate = params_rate(slave_params);
 416                 srcformat.channels = params_channels(slave_params);
 417                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 418                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 419                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 420                 break;
 421         default:
 422                 snd_BUG();
 423                 return -EINVAL;
 424         }
 425         tmpformat = srcformat;
 426
 427         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 428                  srcformat.format,
 429                  srcformat.rate,
 430                  srcformat.channels);
 431         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 432                  dstformat.format,
 433                  dstformat.rate,
 434                  dstformat.channels);
 435
 436         /* Format change (linearization) */
 437         if ((srcformat.format != dstformat.format ||
 438              !rate_match(srcformat.rate, dstformat.rate) ||
 439              srcformat.channels != dstformat.channels) &&
 440             !snd_pcm_format_linear(srcformat.format)) {
 441                 if (snd_pcm_format_linear(dstformat.format))
 442                         tmpformat.format = dstformat.format;
 443                 else
 444                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 445                 first = plugin == NULL;
 446                 switch (srcformat.format) {
 447                 case SNDRV_PCM_FORMAT_MU_LAW:
 448                         err = snd_pcm_plugin_build_mulaw(plug,
 449                                                          &srcformat, &tmpformat,
 450                                                          &plugin);
 451                         break;
 452                 default:
 453                         return -EINVAL;
 454                 }
 455                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 456                 if (err < 0)
 457                         return err;
 458                 err = snd_pcm_plugin_append(plugin);
 459                 if (err < 0) {
 460                         snd_pcm_plugin_free(plugin);
 461                         return err;
 462                 }
 463                 srcformat = tmpformat;
 464                 src_access = dst_access;
 465         }
 466
 467         /* channels reduction */
 468         if (srcformat.channels > dstformat.channels) {
 469                 int sv = srcformat.channels;
 470                 int dv = dstformat.channels;
 471                 route_ttable_entry_t *ttable = snd_kcalloc(dv*sv*sizeof(*ttable), GFP_KERNEL);
 472                 if (ttable == NULL)
 473                         return -ENOMEM;
 474 #if 1
 475                 if (sv == 2 && dv == 1) {
 476                         ttable[0] = HALF;
 477                         ttable[1] = HALF;
 478                 } else
 479 #endif
 480                 {
 481                         int v;
 482                         for (v = 0; v < dv; ++v)
 483                                 ttable[v * sv + v] = FULL;
 484                 }
 485                 tmpformat.channels = dstformat.channels;
 486                 if (rate_match(srcformat.rate, dstformat.rate) &&
 487                     snd_pcm_format_linear(dstformat.format))
 488                         tmpformat.format = dstformat.format;
 489                 err = snd_pcm_plugin_build_route(plug,
 490                                                  &srcformat, &tmpformat,
 491                                                  ttable, &plugin);
 492                 kfree(ttable);
 493                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 494                 if (err < 0) {
 495                         snd_pcm_plugin_free(plugin);
 496                         return err;
 497                 }
 498                 err = snd_pcm_plugin_append(plugin);
 499                 if (err < 0) {
 500                         snd_pcm_plugin_free(plugin);
 501                         return err;
 502                 }
 503                 srcformat = tmpformat;
 504                 src_access = dst_access;
 505         }
 506
 507         /* rate resampling */
 508         if (!rate_match(srcformat.rate, dstformat.rate)) {
 509                 tmpformat.rate = dstformat.rate;
 510                 if (srcformat.channels == dstformat.channels &&
 511                     snd_pcm_format_linear(dstformat.format))
 512                         tmpformat.format = dstformat.format;
 513                 err = snd_pcm_plugin_build_rate(plug,
 514                                                 &srcformat, &tmpformat,
 515                                                 &plugin);
 516                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
 517                 if (err < 0) {
 518                         snd_pcm_plugin_free(plugin);
 519                         return err;
 520                 }
 521                 err = snd_pcm_plugin_append(plugin);
 522                 if (err < 0) {
 523                         snd_pcm_plugin_free(plugin);
 524                         return err;
 525                 }
 526                 srcformat = tmpformat;
 527                 src_access = dst_access;
 528         }
 529
 530         /* channels extension  */
 531         if (srcformat.channels < dstformat.channels) {
 532                 int sv = srcformat.channels;
 533                 int dv = dstformat.channels;
 534                 route_ttable_entry_t *ttable = snd_kcalloc(dv * sv * sizeof(*ttable), GFP_KERNEL);
 535                 if (ttable == NULL)
 536                         return -ENOMEM;
 537 #if 0
 538                 {
 539                         int v;
 540                         for (v = 0; v < sv; ++v)
 541                                 ttable[v * sv + v] = FULL;
 542                 }
 543 #else
 544                 {
 545                         /* Playback is spreaded on all channels */
 546                         int vd, vs;
 547                         for (vd = 0, vs = 0; vd < dv; ++vd) {
 548                                 ttable[vd * sv + vs] = FULL;
 549                                 vs++;
 550                                 if (vs == sv)
 551                                         vs = 0;
 552                         }
 553                 }
 554 #endif
 555                 tmpformat.channels = dstformat.channels;
 556                 if (snd_pcm_format_linear(dstformat.format))
 557                         tmpformat.format = dstformat.format;
 558                 err = snd_pcm_plugin_build_route(plug,
 559                                                  &srcformat, &tmpformat,
 560                                                  ttable, &plugin);
 561                 kfree(ttable);
 562                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 563                 if (err < 0) {
 564                         snd_pcm_plugin_free(plugin);
 565                         return err;
 566                 }
 567                 err = snd_pcm_plugin_append(plugin);
 568                 if (err < 0) {
 569                         snd_pcm_plugin_free(plugin);
 570                         return err;
 571                 }
 572                 srcformat = tmpformat;
 573                 src_access = dst_access;
 574         }
 575
 576         /* format change */
 577         if (srcformat.format != dstformat.format) {
 578                 tmpformat.format = dstformat.format;
 579                 if (tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 580                         err = snd_pcm_plugin_build_mulaw(plug,
 581                                                          &srcformat, &tmpformat,
 582                                                          &plugin);
 583                 }
 584                 else if (snd_pcm_format_linear(srcformat.format) &&
 585                          snd_pcm_format_linear(tmpformat.format)) {
 586                         err = snd_pcm_plugin_build_linear(plug,
 587                                                           &srcformat, &tmpformat,
 588                                                           &plugin);
 589                 }
 590                 else
 591                         return -EINVAL;
 592                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 593                 if (err < 0)
 594                         return err;
 595                 err = snd_pcm_plugin_append(plugin);
 596                 if (err < 0) {
 597                         snd_pcm_plugin_free(plugin);
 598                         return err;
 599                 }
 600                 srcformat = tmpformat;
 601                 src_access = dst_access;
 602         }
 603
 604         /* de-interleave */
 605         if (src_access != dst_access) {
 606                 err = snd_pcm_plugin_build_copy(plug,
 607                                                 &srcformat,
 608                                                 &tmpformat,
 609                                                 &plugin);
 610                 pdprintf("interleave change (copy: returns %i)\n", err);
 611                 if (err < 0)
 612                         return err;
 613                 err = snd_pcm_plugin_append(plugin);
 614                 if (err < 0) {
 615                         snd_pcm_plugin_free(plugin);
 616                         return err;
 617                 }
 618         }
 619
 620         return 0;
 621 }
 622
 623 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(snd_pcm_plug_t *plug,
 624                                          char *buf,
 625                                          snd_pcm_uframes_t count,
 626                                          snd_pcm_plugin_channel_t **channels)
 627 {
 628         snd_pcm_plugin_t *plugin;
 629         snd_pcm_plugin_channel_t *v;
 630         snd_pcm_plugin_format_t *format;
 631         int width, nchannels, channel;
 632         int stream = snd_pcm_plug_stream(plug);
 633
 634         snd_assert(buf != NULL, return -ENXIO);
 635         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 636                 plugin = snd_pcm_plug_first(plug);
 637                 format = &plugin->src_format;
 638         } else {
 639                 plugin = snd_pcm_plug_last(plug);
 640                 format = &plugin->dst_format;
 641         }
 642         v = plugin->buf_channels;
 643         *channels = v;
 644         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
 645                 return width;
 646         nchannels = format->channels;
 647         snd_assert(plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || format->channels <= 1, return -ENXIO);
 648         for (channel = 0; channel < nchannels; channel++, v++) {
 649                 v->frames = count;
 650                 v->enabled = 1;
 651                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 652                 v->area.addr = buf;
 653                 v->area.first = channel * width;
 654                 v->area.step = nchannels * width;
 655         }
 656         return count;
 657 }
 658
 659 int snd_pcm_plug_playback_channels_mask(snd_pcm_plug_t *plug,
 660                                         bitset_t *client_vmask)
 661 {
 662         snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
 663         if (plugin == NULL) {
 664                 return 0;
 665         } else {
 666                 int schannels = plugin->dst_format.channels;
 667                 bitset_t bs[bitset_size(schannels)];
 668                 bitset_t *srcmask;
 669                 bitset_t *dstmask = bs;
 670                 int err;
 671                 bitset_one(dstmask, schannels);
 672                 if (plugin == NULL) {
 673                         bitset_and(client_vmask, dstmask, schannels);
 674                         return 0;
 675                 }
 676                 while (1) {
 677                         err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
 678                         if (err < 0)
 679                                 return err;
 680                         dstmask = srcmask;
 681                         if (plugin->prev == NULL)
 682                                 break;
 683                         plugin = plugin->prev;
 684                 }
 685                 bitset_and(client_vmask, dstmask, plugin->src_format.channels);
 686                 return 0;
 687         }
 688 }
 689
 690 int snd_pcm_plug_capture_channels_mask(snd_pcm_plug_t *plug,
 691                                        bitset_t *client_vmask)
 692 {
 693         snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
 694         if (plugin == NULL) {
 695                 return 0;
 696         } else {
 697                 int schannels = plugin->src_format.channels;
 698                 bitset_t bs[bitset_size(schannels)];
 699                 bitset_t *srcmask = bs;
 700                 bitset_t *dstmask;
 701                 int err;
 702                 bitset_one(srcmask, schannels);
 703                 while (1) {
 704                         err = plugin->dst_channels_mask(plugin, srcmask, &dstmask);
 705                         if (err < 0)
 706                                 return err;
 707                         srcmask = dstmask;
 708                         if (plugin->next == NULL)
 709                                 break;
 710                         plugin = plugin->next;
 711                 }
 712                 bitset_and(client_vmask, srcmask, plugin->dst_format.channels);
 713                 return 0;
 714         }
 715 }
 716
 717 static int snd_pcm_plug_playback_disable_useless_channels(snd_pcm_plug_t *plug,
 718                                                           snd_pcm_plugin_channel_t *src_channels)
 719 {
 720         snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
 721         unsigned int nchannels = plugin->src_format.channels;
 722         bitset_t bs[bitset_size(nchannels)];
 723         bitset_t *srcmask = bs;
 724         int err;
 725         unsigned int channel;
 726         for (channel = 0; channel < nchannels; channel++) {
 727                 if (src_channels[channel].enabled)
 728                         bitset_set(srcmask, channel);
 729                 else
 730                         bitset_reset(srcmask, channel);
 731         }
 732         err = snd_pcm_plug_playback_channels_mask(plug, srcmask);
 733         if (err < 0)
 734                 return err;
 735         for (channel = 0; channel < nchannels; channel++) {
 736                 if (!bitset_get(srcmask, channel))
 737                         src_channels[channel].enabled = 0;
 738         }
 739         return 0;
 740 }
 741
 742 static int snd_pcm_plug_capture_disable_useless_channels(snd_pcm_plug_t *plug,
 743                                                          snd_pcm_plugin_channel_t *src_channels,
 744                                                          snd_pcm_plugin_channel_t *client_channels)
 745 {
 746         snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
 747         unsigned int nchannels = plugin->dst_format.channels;
 748         bitset_t bs[bitset_size(nchannels)];
 749         bitset_t *dstmask = bs;
 750         bitset_t *srcmask;
 751         int err;
 752         unsigned int channel;
 753         for (channel = 0; channel < nchannels; channel++) {
 754                 if (client_channels[channel].enabled)
 755                         bitset_set(dstmask, channel);
 756                 else
 757                         bitset_reset(dstmask, channel);
 758         }
 759         while (plugin) {
 760                 err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
 761                 if (err < 0)
 762                         return err;
 763                 dstmask = srcmask;
 764                 plugin = plugin->prev;
 765         }
 766         plugin = snd_pcm_plug_first(plug);
 767         nchannels = plugin->src_format.channels;
 768         for (channel = 0; channel < nchannels; channel++) {
 769                 if (!bitset_get(dstmask, channel))
 770                         src_channels[channel].enabled = 0;
 771         }
 772         return 0;
 773 }
 774
 775 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)
 776 {
 777         snd_pcm_plugin_t *plugin, *next;
 778         snd_pcm_plugin_channel_t *dst_channels;
 779         int err;
 780         snd_pcm_sframes_t frames = size;
 781
 782         if ((err = snd_pcm_plug_playback_disable_useless_channels(plug, src_channels)) < 0)
 783                 return err;
 784
 785         plugin = snd_pcm_plug_first(plug);
 786         while (plugin && frames > 0) {
 787                 if ((next = plugin->next) != NULL) {
 788                         snd_pcm_sframes_t frames1 = frames;
 789                         if (plugin->dst_frames)
 790                                 frames1 = plugin->dst_frames(plugin, frames);
 791                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
 792                                 return err;
 793                         }
 794                         if (err != frames1) {
 795                                 frames = err;
 796                                 if (plugin->src_frames)
 797                                         frames = plugin->src_frames(plugin, frames1);
 798                         }
 799                 } else
 800                         dst_channels = 0;
 801                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 802                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 803                         return frames;
 804                 src_channels = dst_channels;
 805                 plugin = next;
 806         }
 807         return snd_pcm_plug_client_size(plug, frames);
 808 }
 809
 810 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)
 811 {
 812         snd_pcm_plugin_t *plugin, *next;
 813         snd_pcm_plugin_channel_t *src_channels, *dst_channels;
 814         snd_pcm_sframes_t frames = size;
 815         int err;
 816
 817         frames = snd_pcm_plug_slave_size(plug, frames);
 818         if (frames < 0)
 819                 return frames;
 820
 821         src_channels = 0;
 822         plugin = snd_pcm_plug_first(plug);
 823         while (plugin && frames > 0) {
 824                 if ((next = plugin->next) != NULL) {
 825                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
 826                                 return err;
 827                         }
 828                         frames = err;
 829                         if (!plugin->prev) {
 830                                 if ((err = snd_pcm_plug_capture_disable_useless_channels(plug, dst_channels, dst_channels_final)) < 0)
 831                                         return err;
 832                         }
 833                 } else {
 834                         dst_channels = dst_channels_final;
 835                 }
 836                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 837                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 838                         return frames;
 839                 plugin = next;
 840                 src_channels = dst_channels;
 841         }
 842         return frames;
 843 }
 844
 845 int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_area, size_t dst_offset,
 846                          size_t samples, int format)
 847 {
 848         /* FIXME: sub byte resolution and odd dst_offset */
 849         char *dst;
 850         unsigned int dst_step;
 851         int width;
 852         u_int64_t silence;
 853         if (!dst_area->addr)
 854                 return 0;
 855         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 856         width = snd_pcm_format_physical_width(format);
 857         silence = snd_pcm_format_silence_64(format);
 858         if (dst_area->step == (unsigned int) width) {
 859                 size_t dwords = samples * width / 64;
 860                 u_int64_t *dst64 = (u_int64_t *)dst;
 861
 862                 samples -= dwords * 64 / width;
 863                 while (dwords-- > 0)
 864                         *dst64++ = silence;
 865                 if (samples == 0)
 866                         return 0;
 867                 dst = (char *)dst64;
 868         }
 869         dst_step = dst_area->step / 8;
 870         switch (width) {
 871         case 4: {
 872                 u_int8_t s0 = silence & 0xf0;
 873                 u_int8_t s1 = silence & 0x0f;
 874                 int dstbit = dst_area->first % 8;
 875                 int dstbit_step = dst_area->step % 8;
 876                 while (samples-- > 0) {
 877                         if (dstbit) {
 878                                 *dst &= 0xf0;
 879                                 *dst |= s1;
 880                         } else {
 881                                 *dst &= 0x0f;
 882                                 *dst |= s0;
 883                         }
 884                         dst += dst_step;
 885                         dstbit += dstbit_step;
 886                         if (dstbit == 8) {
 887                                 dst++;
 888                                 dstbit = 0;
 889                         }
 890                 }
 891                 break;
 892         }
 893         case 8: {
 894                 u_int8_t sil = silence;
 895                 while (samples-- > 0) {
 896                         *dst = sil;
 897                         dst += dst_step;
 898                 }
 899                 break;
 900         }
 901         case 16: {
 902                 u_int16_t sil = silence;
 903                 while (samples-- > 0) {
 904                         *(u_int16_t*)dst = sil;
 905                         dst += dst_step;
 906                 }
 907                 break;
 908         }
 909         case 32: {
 910                 u_int32_t sil = silence;
 911                 while (samples-- > 0) {
 912                         *(u_int32_t*)dst = sil;
 913                         dst += dst_step;
 914                 }
 915                 break;
 916         }
 917         case 64: {
 918                 while (samples-- > 0) {
 919                         *(u_int64_t*)dst = silence;
 920                         dst += dst_step;
 921                 }
 922                 break;
 923         }
 924         default:
 925                 snd_BUG();
 926         }
 927         return 0;
 928 }
 929
 930 int snd_pcm_area_copy(const snd_pcm_channel_area_t *src_area, size_t src_offset,
 931                       const snd_pcm_channel_area_t *dst_area, size_t dst_offset,
 932                       size_t samples, int format)
 933 {
 934         /* FIXME: sub byte resolution and odd dst_offset */
 935         char *src, *dst;
 936         int width;
 937         int src_step, dst_step;
 938         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 939         if (!src_area->addr)
 940                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 941         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 942         if (!dst_area->addr)
 943                 return 0;
 944         width = snd_pcm_format_physical_width(format);
 945         if (src_area->step == (unsigned int) width &&
 946             dst_area->step == (unsigned int) width) {
 947                 size_t bytes = samples * width / 8;
 948                 samples -= bytes * 8 / width;
 949                 memcpy(dst, src, bytes);
 950                 if (samples == 0)
 951                         return 0;
 952         }
 953         src_step = src_area->step / 8;
 954         dst_step = dst_area->step / 8;
 955         switch (width) {
 956         case 4: {
 957                 int srcbit = src_area->first % 8;
 958                 int srcbit_step = src_area->step % 8;
 959                 int dstbit = dst_area->first % 8;
 960                 int dstbit_step = dst_area->step % 8;
 961                 while (samples-- > 0) {
 962                         unsigned char srcval;
 963                         if (srcbit)
 964                                 srcval = *src & 0x0f;
 965                         else
 966                                 srcval = *src & 0xf0;
 967                         if (dstbit)
 968                                 *dst &= 0xf0;
 969                         else
 970                                 *dst &= 0x0f;
 971                         *dst |= srcval;
 972                         src += src_step;
 973                         srcbit += srcbit_step;
 974                         if (srcbit == 8) {
 975                                 src++;
 976                                 srcbit = 0;
 977                         }
 978                         dst += dst_step;
 979                         dstbit += dstbit_step;
 980                         if (dstbit == 8) {
 981                                 dst++;
 982                                 dstbit = 0;
 983                         }
 984                 }
 985                 break;
 986         }
 987         case 8: {
 988                 while (samples-- > 0) {
 989                         *dst = *src;
 990                         src += src_step;
 991                         dst += dst_step;
 992                 }
 993                 break;
 994         }
 995         case 16: {
 996                 while (samples-- > 0) {
 997                         *(u_int16_t*)dst = *(u_int16_t*)src;
 998                         src += src_step;
 999                         dst += dst_step;
1000                 }
1001                 break;
1002         }
1003         case 32: {
1004                 while (samples-- > 0) {
1005                         *(u_int32_t*)dst = *(u_int32_t*)src;
1006                         src += src_step;
1007                         dst += dst_step;
1008                 }
1009                 break;
1010         }
1011         case 64: {
1012                 while (samples-- > 0) {
1013                         *(u_int64_t*)dst = *(u_int64_t*)src;
1014                         src += src_step;
1015                         dst += dst_step;
1016                 }
1017                 break;
1018         }
1019         default:
1020                 snd_BUG();
1021         }
1022         return 0;
1023 }