sound/core/oss/pcm_plugin.c

   1 /*
   2  *  PCM Plug-In shared (kernel/library) code
   3  *  Copyright (c) 1999 by Jaroslav Kysela <[email protected]>
   4  *  Copyright (c) 2000 by Abramo Bagnara <[email protected]>
   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 <linux/slab.h>
  28 #include <linux/time.h>
  29 #include <linux/vmalloc.h>
  30 #include <sound/core.h>
  31 #include <sound/pcm.h>
  32 #include <sound/pcm_params.h>
  33 #include "pcm_plugin.h"
  34
  35 #define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
  36 #define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
  37
  38 /*
  39  *  because some cards might have rates "very close", we ignore
  40  *  all "resampling" requests within +-5%
  41  */
  42 static int rate_match(unsigned int src_rate, unsigned int dst_rate)
  43 {
  44         unsigned int low = (src_rate * 95) / 100;
  45         unsigned int high = (src_rate * 105) / 100;
  46         return dst_rate >= low && dst_rate <= high;
  47 }
  48
  49 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
  50 {
  51         struct snd_pcm_plugin_format *format;
  52         ssize_t width;
  53         size_t size;
  54         unsigned int channel;
  55         struct snd_pcm_plugin_channel *c;
  56
  57         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  58                 format = &plugin->src_format;
  59         } else {
  60                 format = &plugin->dst_format;
  61         }
  62         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
  63                 return width;
  64         size = frames * format->channels * width;
  65         if (snd_BUG_ON(size % 8))
  66                 return -ENXIO;
  67         size /= 8;
  68         if (plugin->buf_frames < frames) {
  69                 kvfree(plugin->buf);
  70                 plugin->buf = kvzalloc(size, GFP_KERNEL);
  71                 plugin->buf_frames = frames;
  72         }
  73         if (!plugin->buf) {
  74                 plugin->buf_frames = 0;
  75                 return -ENOMEM;
  76         }
  77         c = plugin->buf_channels;
  78         if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
  79                 for (channel = 0; channel < format->channels; channel++, c++) {
  80                         c->frames = frames;
  81                         c->enabled = 1;
  82                         c->wanted = 0;
  83                         c->area.addr = plugin->buf;
  84                         c->area.first = channel * width;
  85                         c->area.step = format->channels * width;
  86                 }
  87         } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
  88                 if (snd_BUG_ON(size % format->channels))
  89                         return -EINVAL;
  90                 size /= format->channels;
  91                 for (channel = 0; channel < format->channels; channel++, c++) {
  92                         c->frames = frames;
  93                         c->enabled = 1;
  94                         c->wanted = 0;
  95                         c->area.addr = plugin->buf + (channel * size);
  96                         c->area.first = 0;
  97                         c->area.step = width;
  98                 }
  99         } else
 100                 return -EINVAL;
 101         return 0;
 102 }
 103
 104 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
 105 {
 106         int err;
 107         if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
 108                 return -ENXIO;
 109         if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
 110                 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
 111                 while (plugin->next) {
 112                         if (plugin->dst_frames)
 113                                 frames = plugin->dst_frames(plugin, frames);
 114                         if ((snd_pcm_sframes_t)frames <= 0)
 115                                 return -ENXIO;
 116                         plugin = plugin->next;
 117                         err = snd_pcm_plugin_alloc(plugin, frames);
 118                         if (err < 0)
 119                                 return err;
 120                 }
 121         } else {
 122                 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
 123                 while (plugin->prev) {
 124                         if (plugin->src_frames)
 125                                 frames = plugin->src_frames(plugin, frames);
 126                         if ((snd_pcm_sframes_t)frames <= 0)
 127                                 return -ENXIO;
 128                         plugin = plugin->prev;
 129                         err = snd_pcm_plugin_alloc(plugin, frames);
 130                         if (err < 0)
 131                                 return err;
 132                 }
 133         }
 134         return 0;
 135 }
 136
 137
 138 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
 139                                        snd_pcm_uframes_t frames,
 140                                        struct snd_pcm_plugin_channel **channels)
 141 {
 142         *channels = plugin->buf_channels;
 143         return frames;
 144 }
 145
 146 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
 147                          const char *name,
 148                          struct snd_pcm_plugin_format *src_format,
 149                          struct snd_pcm_plugin_format *dst_format,
 150                          size_t extra,
 151                          struct snd_pcm_plugin **ret)
 152 {
 153         struct snd_pcm_plugin *plugin;
 154         unsigned int channels;
 155
 156         if (snd_BUG_ON(!plug))
 157                 return -ENXIO;
 158         if (snd_BUG_ON(!src_format || !dst_format))
 159                 return -ENXIO;
 160         plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
 161         if (plugin == NULL)
 162                 return -ENOMEM;
 163         plugin->name = name;
 164         plugin->plug = plug;
 165         plugin->stream = snd_pcm_plug_stream(plug);
 166         plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 167         plugin->src_format = *src_format;
 168         plugin->src_width = snd_pcm_format_physical_width(src_format->format);
 169         snd_BUG_ON(plugin->src_width <= 0);
 170         plugin->dst_format = *dst_format;
 171         plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
 172         snd_BUG_ON(plugin->dst_width <= 0);
 173         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
 174                 channels = src_format->channels;
 175         else
 176                 channels = dst_format->channels;
 177         plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
 178         if (plugin->buf_channels == NULL) {
 179                 snd_pcm_plugin_free(plugin);
 180                 return -ENOMEM;
 181         }
 182         plugin->client_channels = snd_pcm_plugin_client_channels;
 183         *ret = plugin;
 184         return 0;
 185 }
 186
 187 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
 188 {
 189         if (! plugin)
 190                 return 0;
 191         if (plugin->private_free)
 192                 plugin->private_free(plugin);
 193         kfree(plugin->buf_channels);
 194         kvfree(plugin->buf);
 195         kfree(plugin);
 196         return 0;
 197 }
 198
 199 static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
 200                                          snd_pcm_sframes_t frames,
 201                                          bool check_size)
 202 {
 203         struct snd_pcm_plugin *plugin, *plugin_next;
 204
 205         plugin = snd_pcm_plug_first(plug);
 206         while (plugin && frames > 0) {
 207                 plugin_next = plugin->next;
 208                 if (plugin->dst_frames) {
 209                         frames = plugin->dst_frames(plugin, frames);
 210                         if (frames < 0)
 211                                 return frames;
 212                 }
 213                 if (check_size && frames > plugin->buf_frames)
 214                         frames = plugin->buf_frames;
 215                 plugin = plugin_next;
 216         }
 217         return frames;
 218 }
 219
 220 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
 221                                          snd_pcm_sframes_t frames,
 222                                          bool check_size)
 223 {
 224         struct snd_pcm_plugin *plugin, *plugin_prev;
 225
 226         plugin = snd_pcm_plug_last(plug);
 227         while (plugin && frames > 0) {
 228                 if (check_size && frames > plugin->buf_frames)
 229                         frames = plugin->buf_frames;
 230                 plugin_prev = plugin->prev;
 231                 if (plugin->src_frames) {
 232                         frames = plugin->src_frames(plugin, frames);
 233                         if (frames < 0)
 234                                 return frames;
 235                 }
 236                 plugin = plugin_prev;
 237         }
 238         return frames;
 239 }
 240
 241 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
 242 {
 243         if (snd_BUG_ON(!plug))
 244                 return -ENXIO;
 245         switch (snd_pcm_plug_stream(plug)) {
 246         case SNDRV_PCM_STREAM_PLAYBACK:
 247                 return calc_src_frames(plug, drv_frames, false);
 248         case SNDRV_PCM_STREAM_CAPTURE:
 249                 return calc_dst_frames(plug, drv_frames, false);
 250         default:
 251                 snd_BUG();
 252                 return -EINVAL;
 253         }
 254 }
 255
 256 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
 257 {
 258         if (snd_BUG_ON(!plug))
 259                 return -ENXIO;
 260         switch (snd_pcm_plug_stream(plug)) {
 261         case SNDRV_PCM_STREAM_PLAYBACK:
 262                 return calc_dst_frames(plug, clt_frames, false);
 263         case SNDRV_PCM_STREAM_CAPTURE:
 264                 return calc_src_frames(plug, clt_frames, false);
 265         default:
 266                 snd_BUG();
 267                 return -EINVAL;
 268         }
 269 }
 270
 271 static int snd_pcm_plug_formats(const struct snd_mask *mask,
 272                                 snd_pcm_format_t format)
 273 {
 274         struct snd_mask formats = *mask;
 275         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 276                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 277                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 278                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 279                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 280                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
 281                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
 282                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 283                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 284         snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
 285
 286         if (formats.bits[0] & lower_32_bits(linfmts))
 287                 formats.bits[0] |= lower_32_bits(linfmts);
 288         if (formats.bits[1] & upper_32_bits(linfmts))
 289                 formats.bits[1] |= upper_32_bits(linfmts);
 290         return snd_mask_test(&formats, (__force int)format);
 291 }
 292
 293 static const snd_pcm_format_t preferred_formats[] = {
 294         SNDRV_PCM_FORMAT_S16_LE,
 295         SNDRV_PCM_FORMAT_S16_BE,
 296         SNDRV_PCM_FORMAT_U16_LE,
 297         SNDRV_PCM_FORMAT_U16_BE,
 298         SNDRV_PCM_FORMAT_S24_3LE,
 299         SNDRV_PCM_FORMAT_S24_3BE,
 300         SNDRV_PCM_FORMAT_U24_3LE,
 301         SNDRV_PCM_FORMAT_U24_3BE,
 302         SNDRV_PCM_FORMAT_S24_LE,
 303         SNDRV_PCM_FORMAT_S24_BE,
 304         SNDRV_PCM_FORMAT_U24_LE,
 305         SNDRV_PCM_FORMAT_U24_BE,
 306         SNDRV_PCM_FORMAT_S32_LE,
 307         SNDRV_PCM_FORMAT_S32_BE,
 308         SNDRV_PCM_FORMAT_U32_LE,
 309         SNDRV_PCM_FORMAT_U32_BE,
 310         SNDRV_PCM_FORMAT_S8,
 311         SNDRV_PCM_FORMAT_U8
 312 };
 313
 314 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
 315                                            const struct snd_mask *format_mask)
 316 {
 317         int i;
 318
 319         if (snd_mask_test(format_mask, (__force int)format))
 320                 return format;
 321         if (!snd_pcm_plug_formats(format_mask, format))
 322                 return (__force snd_pcm_format_t)-EINVAL;
 323         if (snd_pcm_format_linear(format)) {
 324                 unsigned int width = snd_pcm_format_width(format);
 325                 int unsignd = snd_pcm_format_unsigned(format) > 0;
 326                 int big = snd_pcm_format_big_endian(format) > 0;
 327                 unsigned int badness, best = -1;
 328                 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
 329                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
 330                         snd_pcm_format_t f = preferred_formats[i];
 331                         unsigned int w;
 332                         if (!snd_mask_test(format_mask, (__force int)f))
 333                                 continue;
 334                         w = snd_pcm_format_width(f);
 335                         if (w >= width)
 336                                 badness = w - width;
 337                         else
 338                                 badness = width - w + 32;
 339                         badness += snd_pcm_format_unsigned(f) != unsignd;
 340                         badness += snd_pcm_format_big_endian(f) != big;
 341                         if (badness < best) {
 342                                 best_format = f;
 343                                 best = badness;
 344                         }
 345                 }
 346                 if ((__force int)best_format >= 0)
 347                         return best_format;
 348                 else
 349                         return (__force snd_pcm_format_t)-EINVAL;
 350         } else {
 351                 switch (format) {
 352                 case SNDRV_PCM_FORMAT_MU_LAW:
 353                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
 354                                 snd_pcm_format_t format1 = preferred_formats[i];
 355                                 if (snd_mask_test(format_mask, (__force int)format1))
 356                                         return format1;
 357                         }
 358                         /* fall through */
 359                 default:
 360                         return (__force snd_pcm_format_t)-EINVAL;
 361                 }
 362         }
 363 }
 364
 365 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
 366                                 struct snd_pcm_hw_params *params,
 367                                 struct snd_pcm_hw_params *slave_params)
 368 {
 369         struct snd_pcm_plugin_format tmpformat;
 370         struct snd_pcm_plugin_format dstformat;
 371         struct snd_pcm_plugin_format srcformat;
 372         snd_pcm_access_t src_access, dst_access;
 373         struct snd_pcm_plugin *plugin = NULL;
 374         int err;
 375         int stream = snd_pcm_plug_stream(plug);
 376         int slave_interleaved = (params_channels(slave_params) == 1 ||
 377                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 378
 379         switch (stream) {
 380         case SNDRV_PCM_STREAM_PLAYBACK:
 381                 dstformat.format = params_format(slave_params);
 382                 dstformat.rate = params_rate(slave_params);
 383                 dstformat.channels = params_channels(slave_params);
 384                 srcformat.format = params_format(params);
 385                 srcformat.rate = params_rate(params);
 386                 srcformat.channels = params_channels(params);
 387                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 388                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 389                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 390                 break;
 391         case SNDRV_PCM_STREAM_CAPTURE:
 392                 dstformat.format = params_format(params);
 393                 dstformat.rate = params_rate(params);
 394                 dstformat.channels = params_channels(params);
 395                 srcformat.format = params_format(slave_params);
 396                 srcformat.rate = params_rate(slave_params);
 397                 srcformat.channels = params_channels(slave_params);
 398                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 399                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 400                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 401                 break;
 402         default:
 403                 snd_BUG();
 404                 return -EINVAL;
 405         }
 406         tmpformat = srcformat;
 407
 408         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 409                  srcformat.format,
 410                  srcformat.rate,
 411                  srcformat.channels);
 412         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 413                  dstformat.format,
 414                  dstformat.rate,
 415                  dstformat.channels);
 416
 417         /* Format change (linearization) */
 418         if (! rate_match(srcformat.rate, dstformat.rate) &&
 419             ! snd_pcm_format_linear(srcformat.format)) {
 420                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
 421                         return -EINVAL;
 422                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
 423                 err = snd_pcm_plugin_build_mulaw(plug,
 424                                                  &srcformat, &tmpformat,
 425                                                  &plugin);
 426                 if (err < 0)
 427                         return err;
 428                 err = snd_pcm_plugin_append(plugin);
 429                 if (err < 0) {
 430                         snd_pcm_plugin_free(plugin);
 431                         return err;
 432                 }
 433                 srcformat = tmpformat;
 434                 src_access = dst_access;
 435         }
 436
 437         /* channels reduction */
 438         if (srcformat.channels > dstformat.channels) {
 439                 tmpformat.channels = dstformat.channels;
 440                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 441                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 442                 if (err < 0)
 443                         return err;
 444                 err = snd_pcm_plugin_append(plugin);
 445                 if (err < 0) {
 446                         snd_pcm_plugin_free(plugin);
 447                         return err;
 448                 }
 449                 srcformat = tmpformat;
 450                 src_access = dst_access;
 451         }
 452
 453         /* rate resampling */
 454         if (!rate_match(srcformat.rate, dstformat.rate)) {
 455                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
 456                         /* convert to S16 for resampling */
 457                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 458                         err = snd_pcm_plugin_build_linear(plug,
 459                                                           &srcformat, &tmpformat,
 460                                                           &plugin);
 461                         if (err < 0)
 462                                 return err;
 463                         err = snd_pcm_plugin_append(plugin);
 464                         if (err < 0) {
 465                                 snd_pcm_plugin_free(plugin);
 466                                 return err;
 467                         }
 468                         srcformat = tmpformat;
 469                         src_access = dst_access;
 470                 }
 471                 tmpformat.rate = dstformat.rate;
 472                 err = snd_pcm_plugin_build_rate(plug,
 473                                                 &srcformat, &tmpformat,
 474                                                 &plugin);
 475                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
 476                 if (err < 0)
 477                         return err;
 478                 err = snd_pcm_plugin_append(plugin);
 479                 if (err < 0) {
 480                         snd_pcm_plugin_free(plugin);
 481                         return err;
 482                 }
 483                 srcformat = tmpformat;
 484                 src_access = dst_access;
 485         }
 486
 487         /* format change */
 488         if (srcformat.format != dstformat.format) {
 489                 tmpformat.format = dstformat.format;
 490                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
 491                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 492                         err = snd_pcm_plugin_build_mulaw(plug,
 493                                                          &srcformat, &tmpformat,
 494                                                          &plugin);
 495                 }
 496                 else if (snd_pcm_format_linear(srcformat.format) &&
 497                          snd_pcm_format_linear(tmpformat.format)) {
 498                         err = snd_pcm_plugin_build_linear(plug,
 499                                                           &srcformat, &tmpformat,
 500                                                           &plugin);
 501                 }
 502                 else
 503                         return -EINVAL;
 504                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 505                 if (err < 0)
 506                         return err;
 507                 err = snd_pcm_plugin_append(plugin);
 508                 if (err < 0) {
 509                         snd_pcm_plugin_free(plugin);
 510                         return err;
 511                 }
 512                 srcformat = tmpformat;
 513                 src_access = dst_access;
 514         }
 515
 516         /* channels extension */
 517         if (srcformat.channels < dstformat.channels) {
 518                 tmpformat.channels = dstformat.channels;
 519                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 520                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 521                 if (err < 0)
 522                         return err;
 523                 err = snd_pcm_plugin_append(plugin);
 524                 if (err < 0) {
 525                         snd_pcm_plugin_free(plugin);
 526                         return err;
 527                 }
 528                 srcformat = tmpformat;
 529                 src_access = dst_access;
 530         }
 531
 532         /* de-interleave */
 533         if (src_access != dst_access) {
 534                 err = snd_pcm_plugin_build_copy(plug,
 535                                                 &srcformat,
 536                                                 &tmpformat,
 537                                                 &plugin);
 538                 pdprintf("interleave change (copy: returns %i)\n", err);
 539                 if (err < 0)
 540                         return err;
 541                 err = snd_pcm_plugin_append(plugin);
 542                 if (err < 0) {
 543                         snd_pcm_plugin_free(plugin);
 544                         return err;
 545                 }
 546         }
 547
 548         return 0;
 549 }
 550
 551 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
 552                                          char *buf,
 553                                          snd_pcm_uframes_t count,
 554                                          struct snd_pcm_plugin_channel **channels)
 555 {
 556         struct snd_pcm_plugin *plugin;
 557         struct snd_pcm_plugin_channel *v;
 558         struct snd_pcm_plugin_format *format;
 559         int width, nchannels, channel;
 560         int stream = snd_pcm_plug_stream(plug);
 561
 562         if (snd_BUG_ON(!buf))
 563                 return -ENXIO;
 564         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 565                 plugin = snd_pcm_plug_first(plug);
 566                 format = &plugin->src_format;
 567         } else {
 568                 plugin = snd_pcm_plug_last(plug);
 569                 format = &plugin->dst_format;
 570         }
 571         v = plugin->buf_channels;
 572         *channels = v;
 573         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
 574                 return width;
 575         nchannels = format->channels;
 576         if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
 577                        format->channels > 1))
 578                 return -ENXIO;
 579         for (channel = 0; channel < nchannels; channel++, v++) {
 580                 v->frames = count;
 581                 v->enabled = 1;
 582                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 583                 v->area.addr = buf;
 584                 v->area.first = channel * width;
 585                 v->area.step = nchannels * width;
 586         }
 587         return count;
 588 }
 589
 590 snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size)
 591 {
 592         struct snd_pcm_plugin *plugin, *next;
 593         struct snd_pcm_plugin_channel *dst_channels;
 594         int err;
 595         snd_pcm_sframes_t frames = size;
 596
 597         plugin = snd_pcm_plug_first(plug);
 598         while (plugin) {
 599                 if (frames <= 0)
 600                         return frames;
 601                 if ((next = plugin->next) != NULL) {
 602                         snd_pcm_sframes_t frames1 = frames;
 603                         if (plugin->dst_frames) {
 604                                 frames1 = plugin->dst_frames(plugin, frames);
 605                                 if (frames1 <= 0)
 606                                         return frames1;
 607                         }
 608                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
 609                                 return err;
 610                         }
 611                         if (err != frames1) {
 612                                 frames = err;
 613                                 if (plugin->src_frames) {
 614                                         frames = plugin->src_frames(plugin, frames1);
 615                                         if (frames <= 0)
 616                                                 return frames;
 617                                 }
 618                         }
 619                 } else
 620                         dst_channels = NULL;
 621                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 622                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 623                         return frames;
 624                 src_channels = dst_channels;
 625                 plugin = next;
 626         }
 627         return calc_src_frames(plug, frames, true);
 628 }
 629
 630 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
 631 {
 632         struct snd_pcm_plugin *plugin, *next;
 633         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
 634         snd_pcm_sframes_t frames = size;
 635         int err;
 636
 637         frames = calc_src_frames(plug, frames, true);
 638         if (frames < 0)
 639                 return frames;
 640
 641         src_channels = NULL;
 642         plugin = snd_pcm_plug_first(plug);
 643         while (plugin && frames > 0) {
 644                 if ((next = plugin->next) != NULL) {
 645                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
 646                                 return err;
 647                         }
 648                         frames = err;
 649                 } else {
 650                         dst_channels = dst_channels_final;
 651                 }
 652                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 653                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 654                         return frames;
 655                 plugin = next;
 656                 src_channels = dst_channels;
 657         }
 658         return frames;
 659 }
 660
 661 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 662                          size_t samples, snd_pcm_format_t format)
 663 {
 664         /* FIXME: sub byte resolution and odd dst_offset */
 665         unsigned char *dst;
 666         unsigned int dst_step;
 667         int width;
 668         const unsigned char *silence;
 669         if (!dst_area->addr)
 670                 return 0;
 671         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 672         width = snd_pcm_format_physical_width(format);
 673         if (width <= 0)
 674                 return -EINVAL;
 675         if (dst_area->step == (unsigned int) width && width >= 8)
 676                 return snd_pcm_format_set_silence(format, dst, samples);
 677         silence = snd_pcm_format_silence_64(format);
 678         if (! silence)
 679                 return -EINVAL;
 680         dst_step = dst_area->step / 8;
 681         if (width == 4) {
 682                 /* Ima ADPCM */
 683                 int dstbit = dst_area->first % 8;
 684                 int dstbit_step = dst_area->step % 8;
 685                 while (samples-- > 0) {
 686                         if (dstbit)
 687                                 *dst &= 0xf0;
 688                         else
 689                                 *dst &= 0x0f;
 690                         dst += dst_step;
 691                         dstbit += dstbit_step;
 692                         if (dstbit == 8) {
 693                                 dst++;
 694                                 dstbit = 0;
 695                         }
 696                 }
 697         } else {
 698                 width /= 8;
 699                 while (samples-- > 0) {
 700                         memcpy(dst, silence, width);
 701                         dst += dst_step;
 702                 }
 703         }
 704         return 0;
 705 }
 706
 707 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
 708                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 709                       size_t samples, snd_pcm_format_t format)
 710 {
 711         /* FIXME: sub byte resolution and odd dst_offset */
 712         char *src, *dst;
 713         int width;
 714         int src_step, dst_step;
 715         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 716         if (!src_area->addr)
 717                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 718         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 719         if (!dst_area->addr)
 720                 return 0;
 721         width = snd_pcm_format_physical_width(format);
 722         if (width <= 0)
 723                 return -EINVAL;
 724         if (src_area->step == (unsigned int) width &&
 725             dst_area->step == (unsigned int) width && width >= 8) {
 726                 size_t bytes = samples * width / 8;
 727                 memcpy(dst, src, bytes);
 728                 return 0;
 729         }
 730         src_step = src_area->step / 8;
 731         dst_step = dst_area->step / 8;
 732         if (width == 4) {
 733                 /* Ima ADPCM */
 734                 int srcbit = src_area->first % 8;
 735                 int srcbit_step = src_area->step % 8;
 736                 int dstbit = dst_area->first % 8;
 737                 int dstbit_step = dst_area->step % 8;
 738                 while (samples-- > 0) {
 739                         unsigned char srcval;
 740                         if (srcbit)
 741                                 srcval = *src & 0x0f;
 742                         else
 743                                 srcval = (*src & 0xf0) >> 4;
 744                         if (dstbit)
 745                                 *dst = (*dst & 0xf0) | srcval;
 746                         else
 747                                 *dst = (*dst & 0x0f) | (srcval << 4);
 748                         src += src_step;
 749                         srcbit += srcbit_step;
 750                         if (srcbit == 8) {
 751                                 src++;
 752                                 srcbit = 0;
 753                         }
 754                         dst += dst_step;
 755                         dstbit += dstbit_step;
 756                         if (dstbit == 8) {
 757                                 dst++;
 758                                 dstbit = 0;
 759                         }
 760                 }
 761         } else {
 762                 width /= 8;
 763                 while (samples-- > 0) {
 764                         memcpy(dst, src, width);
 765                         src += src_step;
 766                         dst += dst_step;
 767                 }
 768         }
 769         return 0;
 770 }