sound/core/oss/pcm_plugin.c

   1 /*
   2  *  PCM Plug-In shared (kernel/library) code
   3  *  Copyright (c) 1999 by Jaroslav Kysela <perex@perex.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 <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 = array3_size(frames, format->channels, width);
  65         /* check for too large period size once again */
  66         if (size > 1024 * 1024)
  67                 return -ENOMEM;
  68         if (snd_BUG_ON(size % 8))
  69                 return -ENXIO;
  70         size /= 8;
  71         if (plugin->buf_frames < frames) {
  72                 kvfree(plugin->buf);
  73                 plugin->buf = kvzalloc(size, GFP_KERNEL);
  74                 plugin->buf_frames = frames;
  75         }
  76         if (!plugin->buf) {
  77                 plugin->buf_frames = 0;
  78                 return -ENOMEM;
  79         }
  80         c = plugin->buf_channels;
  81         if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
  82                 for (channel = 0; channel < format->channels; channel++, c++) {
  83                         c->frames = frames;
  84                         c->enabled = 1;
  85                         c->wanted = 0;
  86                         c->area.addr = plugin->buf;
  87                         c->area.first = channel * width;
  88                         c->area.step = format->channels * width;
  89                 }
  90         } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
  91                 if (snd_BUG_ON(size % format->channels))
  92                         return -EINVAL;
  93                 size /= format->channels;
  94                 for (channel = 0; channel < format->channels; channel++, c++) {
  95                         c->frames = frames;
  96                         c->enabled = 1;
  97                         c->wanted = 0;
  98                         c->area.addr = plugin->buf + (channel * size);
  99                         c->area.first = 0;
 100                         c->area.step = width;
 101                 }
 102         } else
 103                 return -EINVAL;
 104         return 0;
 105 }
 106
 107 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
 108 {
 109         int err;
 110         if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
 111                 return -ENXIO;
 112         if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
 113                 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
 114                 while (plugin->next) {
 115                         if (plugin->dst_frames)
 116                                 frames = plugin->dst_frames(plugin, frames);
 117                         if ((snd_pcm_sframes_t)frames <= 0)
 118                                 return -ENXIO;
 119                         plugin = plugin->next;
 120                         err = snd_pcm_plugin_alloc(plugin, frames);
 121                         if (err < 0)
 122                                 return err;
 123                 }
 124         } else {
 125                 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
 126                 while (plugin->prev) {
 127                         if (plugin->src_frames)
 128                                 frames = plugin->src_frames(plugin, frames);
 129                         if ((snd_pcm_sframes_t)frames <= 0)
 130                                 return -ENXIO;
 131                         plugin = plugin->prev;
 132                         err = snd_pcm_plugin_alloc(plugin, frames);
 133                         if (err < 0)
 134                                 return err;
 135                 }
 136         }
 137         return 0;
 138 }
 139
 140
 141 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
 142                                        snd_pcm_uframes_t frames,
 143                                        struct snd_pcm_plugin_channel **channels)
 144 {
 145         *channels = plugin->buf_channels;
 146         return frames;
 147 }
 148
 149 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
 150                          const char *name,
 151                          struct snd_pcm_plugin_format *src_format,
 152                          struct snd_pcm_plugin_format *dst_format,
 153                          size_t extra,
 154                          struct snd_pcm_plugin **ret)
 155 {
 156         struct snd_pcm_plugin *plugin;
 157         unsigned int channels;
 158
 159         if (snd_BUG_ON(!plug))
 160                 return -ENXIO;
 161         if (snd_BUG_ON(!src_format || !dst_format))
 162                 return -ENXIO;
 163         plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
 164         if (plugin == NULL)
 165                 return -ENOMEM;
 166         plugin->name = name;
 167         plugin->plug = plug;
 168         plugin->stream = snd_pcm_plug_stream(plug);
 169         plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 170         plugin->src_format = *src_format;
 171         plugin->src_width = snd_pcm_format_physical_width(src_format->format);
 172         snd_BUG_ON(plugin->src_width <= 0);
 173         plugin->dst_format = *dst_format;
 174         plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
 175         snd_BUG_ON(plugin->dst_width <= 0);
 176         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
 177                 channels = src_format->channels;
 178         else
 179                 channels = dst_format->channels;
 180         plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
 181         if (plugin->buf_channels == NULL) {
 182                 snd_pcm_plugin_free(plugin);
 183                 return -ENOMEM;
 184         }
 185         plugin->client_channels = snd_pcm_plugin_client_channels;
 186         *ret = plugin;
 187         return 0;
 188 }
 189
 190 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
 191 {
 192         if (! plugin)
 193                 return 0;
 194         if (plugin->private_free)
 195                 plugin->private_free(plugin);
 196         kfree(plugin->buf_channels);
 197         kvfree(plugin->buf);
 198         kfree(plugin);
 199         return 0;
 200 }
 201
 202 static snd_pcm_sframes_t plug_client_size(struct snd_pcm_substream *plug,
 203                                           snd_pcm_uframes_t drv_frames,
 204                                           bool check_size)
 205 {
 206         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
 207         int stream;
 208
 209         if (snd_BUG_ON(!plug))
 210                 return -ENXIO;
 211         if (drv_frames == 0)
 212                 return 0;
 213         stream = snd_pcm_plug_stream(plug);
 214         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 215                 plugin = snd_pcm_plug_last(plug);
 216                 while (plugin && drv_frames > 0) {
 217                         plugin_prev = plugin->prev;
 218                         if (plugin->src_frames)
 219                                 drv_frames = plugin->src_frames(plugin, drv_frames);
 220                         if (check_size && plugin->buf_frames &&
 221                             drv_frames > plugin->buf_frames)
 222                                 drv_frames = plugin->buf_frames;
 223                         plugin = plugin_prev;
 224                 }
 225         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 226                 plugin = snd_pcm_plug_first(plug);
 227                 while (plugin && drv_frames > 0) {
 228                         plugin_next = plugin->next;
 229                         if (check_size && plugin->buf_frames &&
 230                             drv_frames > plugin->buf_frames)
 231                                 drv_frames = plugin->buf_frames;
 232                         if (plugin->dst_frames)
 233                                 drv_frames = plugin->dst_frames(plugin, drv_frames);
 234                         plugin = plugin_next;
 235                 }
 236         } else
 237                 snd_BUG();
 238         return drv_frames;
 239 }
 240
 241 static snd_pcm_sframes_t plug_slave_size(struct snd_pcm_substream *plug,
 242                                          snd_pcm_uframes_t clt_frames,
 243                                          bool check_size)
 244 {
 245         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
 246         snd_pcm_sframes_t frames;
 247         int stream;
 248
 249         if (snd_BUG_ON(!plug))
 250                 return -ENXIO;
 251         if (clt_frames == 0)
 252                 return 0;
 253         frames = clt_frames;
 254         stream = snd_pcm_plug_stream(plug);
 255         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 256                 plugin = snd_pcm_plug_first(plug);
 257                 while (plugin && frames > 0) {
 258                         plugin_next = plugin->next;
 259                         if (check_size && plugin->buf_frames &&
 260                             frames > plugin->buf_frames)
 261                                 frames = plugin->buf_frames;
 262                         if (plugin->dst_frames) {
 263                                 frames = plugin->dst_frames(plugin, frames);
 264                                 if (frames < 0)
 265                                         return frames;
 266                         }
 267                         plugin = plugin_next;
 268                 }
 269         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 270                 plugin = snd_pcm_plug_last(plug);
 271                 while (plugin) {
 272                         plugin_prev = plugin->prev;
 273                         if (plugin->src_frames) {
 274                                 frames = plugin->src_frames(plugin, frames);
 275                                 if (frames < 0)
 276                                         return frames;
 277                         }
 278                         if (check_size && plugin->buf_frames &&
 279                             frames > plugin->buf_frames)
 280                                 frames = plugin->buf_frames;
 281                         plugin = plugin_prev;
 282                 }
 283         } else
 284                 snd_BUG();
 285         return frames;
 286 }
 287
 288 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug,
 289                                            snd_pcm_uframes_t drv_frames)
 290 {
 291         return plug_client_size(plug, drv_frames, false);
 292 }
 293
 294 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug,
 295                                           snd_pcm_uframes_t clt_frames)
 296 {
 297         return plug_slave_size(plug, clt_frames, false);
 298 }
 299
 300 static int snd_pcm_plug_formats(const struct snd_mask *mask,
 301                                 snd_pcm_format_t format)
 302 {
 303         struct snd_mask formats = *mask;
 304         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 305                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 306                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 307                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 308                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 309                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
 310                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
 311                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 312                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 313         snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
 314
 315         if (formats.bits[0] & lower_32_bits(linfmts))
 316                 formats.bits[0] |= lower_32_bits(linfmts);
 317         if (formats.bits[1] & upper_32_bits(linfmts))
 318                 formats.bits[1] |= upper_32_bits(linfmts);
 319         return snd_mask_test(&formats, (__force int)format);
 320 }
 321
 322 static snd_pcm_format_t preferred_formats[] = {
 323         SNDRV_PCM_FORMAT_S16_LE,
 324         SNDRV_PCM_FORMAT_S16_BE,
 325         SNDRV_PCM_FORMAT_U16_LE,
 326         SNDRV_PCM_FORMAT_U16_BE,
 327         SNDRV_PCM_FORMAT_S24_3LE,
 328         SNDRV_PCM_FORMAT_S24_3BE,
 329         SNDRV_PCM_FORMAT_U24_3LE,
 330         SNDRV_PCM_FORMAT_U24_3BE,
 331         SNDRV_PCM_FORMAT_S24_LE,
 332         SNDRV_PCM_FORMAT_S24_BE,
 333         SNDRV_PCM_FORMAT_U24_LE,
 334         SNDRV_PCM_FORMAT_U24_BE,
 335         SNDRV_PCM_FORMAT_S32_LE,
 336         SNDRV_PCM_FORMAT_S32_BE,
 337         SNDRV_PCM_FORMAT_U32_LE,
 338         SNDRV_PCM_FORMAT_U32_BE,
 339         SNDRV_PCM_FORMAT_S8,
 340         SNDRV_PCM_FORMAT_U8
 341 };
 342
 343 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
 344                                            const struct snd_mask *format_mask)
 345 {
 346         int i;
 347
 348         if (snd_mask_test(format_mask, (__force int)format))
 349                 return format;
 350         if (!snd_pcm_plug_formats(format_mask, format))
 351                 return (__force snd_pcm_format_t)-EINVAL;
 352         if (snd_pcm_format_linear(format)) {
 353                 unsigned int width = snd_pcm_format_width(format);
 354                 int unsignd = snd_pcm_format_unsigned(format) > 0;
 355                 int big = snd_pcm_format_big_endian(format) > 0;
 356                 unsigned int badness, best = -1;
 357                 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
 358                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
 359                         snd_pcm_format_t f = preferred_formats[i];
 360                         unsigned int w;
 361                         if (!snd_mask_test(format_mask, (__force int)f))
 362                                 continue;
 363                         w = snd_pcm_format_width(f);
 364                         if (w >= width)
 365                                 badness = w - width;
 366                         else
 367                                 badness = width - w + 32;
 368                         badness += snd_pcm_format_unsigned(f) != unsignd;
 369                         badness += snd_pcm_format_big_endian(f) != big;
 370                         if (badness < best) {
 371                                 best_format = f;
 372                                 best = badness;
 373                         }
 374                 }
 375                 if ((__force int)best_format >= 0)
 376                         return best_format;
 377                 else
 378                         return (__force snd_pcm_format_t)-EINVAL;
 379         } else {
 380                 switch (format) {
 381                 case SNDRV_PCM_FORMAT_MU_LAW:
 382                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
 383                                 snd_pcm_format_t format1 = preferred_formats[i];
 384                                 if (snd_mask_test(format_mask, (__force int)format1))
 385                                         return format1;
 386                         }
 387                         /* fall through */
 388                 default:
 389                         return (__force snd_pcm_format_t)-EINVAL;
 390                 }
 391         }
 392 }
 393
 394 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
 395                                 struct snd_pcm_hw_params *params,
 396                                 struct snd_pcm_hw_params *slave_params)
 397 {
 398         struct snd_pcm_plugin_format tmpformat;
 399         struct snd_pcm_plugin_format dstformat;
 400         struct snd_pcm_plugin_format srcformat;
 401         snd_pcm_access_t src_access, dst_access;
 402         struct snd_pcm_plugin *plugin = NULL;
 403         int err;
 404         int stream = snd_pcm_plug_stream(plug);
 405         int slave_interleaved = (params_channels(slave_params) == 1 ||
 406                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 407
 408         switch (stream) {
 409         case SNDRV_PCM_STREAM_PLAYBACK:
 410                 dstformat.format = params_format(slave_params);
 411                 dstformat.rate = params_rate(slave_params);
 412                 dstformat.channels = params_channels(slave_params);
 413                 srcformat.format = params_format(params);
 414                 srcformat.rate = params_rate(params);
 415                 srcformat.channels = params_channels(params);
 416                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 417                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 418                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 419                 break;
 420         case SNDRV_PCM_STREAM_CAPTURE:
 421                 dstformat.format = params_format(params);
 422                 dstformat.rate = params_rate(params);
 423                 dstformat.channels = params_channels(params);
 424                 srcformat.format = params_format(slave_params);
 425                 srcformat.rate = params_rate(slave_params);
 426                 srcformat.channels = params_channels(slave_params);
 427                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 428                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 429                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 430                 break;
 431         default:
 432                 snd_BUG();
 433                 return -EINVAL;
 434         }
 435         tmpformat = srcformat;
 436
 437         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 438                  srcformat.format,
 439                  srcformat.rate,
 440                  srcformat.channels);
 441         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 442                  dstformat.format,
 443                  dstformat.rate,
 444                  dstformat.channels);
 445
 446         /* Format change (linearization) */
 447         if (! rate_match(srcformat.rate, dstformat.rate) &&
 448             ! snd_pcm_format_linear(srcformat.format)) {
 449                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
 450                         return -EINVAL;
 451                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
 452                 err = snd_pcm_plugin_build_mulaw(plug,
 453                                                  &srcformat, &tmpformat,
 454                                                  &plugin);
 455                 if (err < 0)
 456                         return err;
 457                 err = snd_pcm_plugin_append(plugin);
 458                 if (err < 0) {
 459                         snd_pcm_plugin_free(plugin);
 460                         return err;
 461                 }
 462                 srcformat = tmpformat;
 463                 src_access = dst_access;
 464         }
 465
 466         /* channels reduction */
 467         if (srcformat.channels > dstformat.channels) {
 468                 tmpformat.channels = dstformat.channels;
 469                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 470                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 471                 if (err < 0)
 472                         return err;
 473                 err = snd_pcm_plugin_append(plugin);
 474                 if (err < 0) {
 475                         snd_pcm_plugin_free(plugin);
 476                         return err;
 477                 }
 478                 srcformat = tmpformat;
 479                 src_access = dst_access;
 480         }
 481
 482         /* rate resampling */
 483         if (!rate_match(srcformat.rate, dstformat.rate)) {
 484                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
 485                         /* convert to S16 for resampling */
 486                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 487                         err = snd_pcm_plugin_build_linear(plug,
 488                                                           &srcformat, &tmpformat,
 489                                                           &plugin);
 490                         if (err < 0)
 491                                 return err;
 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                 tmpformat.rate = dstformat.rate;
 501                 err = snd_pcm_plugin_build_rate(plug,
 502                                                 &srcformat, &tmpformat,
 503                                                 &plugin);
 504                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, 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         /* format change */
 517         if (srcformat.format != dstformat.format) {
 518                 tmpformat.format = dstformat.format;
 519                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
 520                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 521                         err = snd_pcm_plugin_build_mulaw(plug,
 522                                                          &srcformat, &tmpformat,
 523                                                          &plugin);
 524                 }
 525                 else if (snd_pcm_format_linear(srcformat.format) &&
 526                          snd_pcm_format_linear(tmpformat.format)) {
 527                         err = snd_pcm_plugin_build_linear(plug,
 528                                                           &srcformat, &tmpformat,
 529                                                           &plugin);
 530                 }
 531                 else
 532                         return -EINVAL;
 533                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 534                 if (err < 0)
 535                         return err;
 536                 err = snd_pcm_plugin_append(plugin);
 537                 if (err < 0) {
 538                         snd_pcm_plugin_free(plugin);
 539                         return err;
 540                 }
 541                 srcformat = tmpformat;
 542                 src_access = dst_access;
 543         }
 544
 545         /* channels extension */
 546         if (srcformat.channels < dstformat.channels) {
 547                 tmpformat.channels = dstformat.channels;
 548                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 549                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 550                 if (err < 0)
 551                         return err;
 552                 err = snd_pcm_plugin_append(plugin);
 553                 if (err < 0) {
 554                         snd_pcm_plugin_free(plugin);
 555                         return err;
 556                 }
 557                 srcformat = tmpformat;
 558                 src_access = dst_access;
 559         }
 560
 561         /* de-interleave */
 562         if (src_access != dst_access) {
 563                 err = snd_pcm_plugin_build_copy(plug,
 564                                                 &srcformat,
 565                                                 &tmpformat,
 566                                                 &plugin);
 567                 pdprintf("interleave change (copy: returns %i)\n", err);
 568                 if (err < 0)
 569                         return err;
 570                 err = snd_pcm_plugin_append(plugin);
 571                 if (err < 0) {
 572                         snd_pcm_plugin_free(plugin);
 573                         return err;
 574                 }
 575         }
 576
 577         return 0;
 578 }
 579
 580 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
 581                                          char *buf,
 582                                          snd_pcm_uframes_t count,
 583                                          struct snd_pcm_plugin_channel **channels)
 584 {
 585         struct snd_pcm_plugin *plugin;
 586         struct snd_pcm_plugin_channel *v;
 587         struct snd_pcm_plugin_format *format;
 588         int width, nchannels, channel;
 589         int stream = snd_pcm_plug_stream(plug);
 590
 591         if (snd_BUG_ON(!buf))
 592                 return -ENXIO;
 593         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 594                 plugin = snd_pcm_plug_first(plug);
 595                 format = &plugin->src_format;
 596         } else {
 597                 plugin = snd_pcm_plug_last(plug);
 598                 format = &plugin->dst_format;
 599         }
 600         v = plugin->buf_channels;
 601         *channels = v;
 602         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
 603                 return width;
 604         nchannels = format->channels;
 605         if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
 606                        format->channels > 1))
 607                 return -ENXIO;
 608         for (channel = 0; channel < nchannels; channel++, v++) {
 609                 v->frames = count;
 610                 v->enabled = 1;
 611                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 612                 v->area.addr = buf;
 613                 v->area.first = channel * width;
 614                 v->area.step = nchannels * width;
 615         }
 616         return count;
 617 }
 618
 619 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)
 620 {
 621         struct snd_pcm_plugin *plugin, *next;
 622         struct snd_pcm_plugin_channel *dst_channels;
 623         int err;
 624         snd_pcm_sframes_t frames = size;
 625
 626         plugin = snd_pcm_plug_first(plug);
 627         while (plugin) {
 628                 if (frames <= 0)
 629                         return frames;
 630                 if ((next = plugin->next) != NULL) {
 631                         snd_pcm_sframes_t frames1 = frames;
 632                         if (plugin->dst_frames) {
 633                                 frames1 = plugin->dst_frames(plugin, frames);
 634                                 if (frames1 <= 0)
 635                                         return frames1;
 636                         }
 637                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
 638                                 return err;
 639                         }
 640                         if (err != frames1) {
 641                                 frames = err;
 642                                 if (plugin->src_frames) {
 643                                         frames = plugin->src_frames(plugin, frames1);
 644                                         if (frames <= 0)
 645                                                 return frames;
 646                                 }
 647                         }
 648                 } else
 649                         dst_channels = NULL;
 650                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 651                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 652                         return frames;
 653                 src_channels = dst_channels;
 654                 plugin = next;
 655         }
 656         return plug_client_size(plug, frames, true);
 657 }
 658
 659 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)
 660 {
 661         struct snd_pcm_plugin *plugin, *next;
 662         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
 663         snd_pcm_sframes_t frames = size;
 664         int err;
 665
 666         frames = plug_slave_size(plug, frames, true);
 667         if (frames < 0)
 668                 return frames;
 669
 670         src_channels = NULL;
 671         plugin = snd_pcm_plug_first(plug);
 672         while (plugin && frames > 0) {
 673                 if ((next = plugin->next) != NULL) {
 674                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
 675                                 return err;
 676                         }
 677                         frames = err;
 678                 } else {
 679                         dst_channels = dst_channels_final;
 680                 }
 681                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 682                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 683                         return frames;
 684                 plugin = next;
 685                 src_channels = dst_channels;
 686         }
 687         return frames;
 688 }
 689
 690 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 691                          size_t samples, snd_pcm_format_t format)
 692 {
 693         /* FIXME: sub byte resolution and odd dst_offset */
 694         unsigned char *dst;
 695         unsigned int dst_step;
 696         int width;
 697         const unsigned char *silence;
 698         if (!dst_area->addr)
 699                 return 0;
 700         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 701         width = snd_pcm_format_physical_width(format);
 702         if (width <= 0)
 703                 return -EINVAL;
 704         if (dst_area->step == (unsigned int) width && width >= 8)
 705                 return snd_pcm_format_set_silence(format, dst, samples);
 706         silence = snd_pcm_format_silence_64(format);
 707         if (! silence)
 708                 return -EINVAL;
 709         dst_step = dst_area->step / 8;
 710         if (width == 4) {
 711                 /* Ima ADPCM */
 712                 int dstbit = dst_area->first % 8;
 713                 int dstbit_step = dst_area->step % 8;
 714                 while (samples-- > 0) {
 715                         if (dstbit)
 716                                 *dst &= 0xf0;
 717                         else
 718                                 *dst &= 0x0f;
 719                         dst += dst_step;
 720                         dstbit += dstbit_step;
 721                         if (dstbit == 8) {
 722                                 dst++;
 723                                 dstbit = 0;
 724                         }
 725                 }
 726         } else {
 727                 width /= 8;
 728                 while (samples-- > 0) {
 729                         memcpy(dst, silence, width);
 730                         dst += dst_step;
 731                 }
 732         }
 733         return 0;
 734 }
 735
 736 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
 737                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 738                       size_t samples, snd_pcm_format_t format)
 739 {
 740         /* FIXME: sub byte resolution and odd dst_offset */
 741         char *src, *dst;
 742         int width;
 743         int src_step, dst_step;
 744         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 745         if (!src_area->addr)
 746                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 747         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 748         if (!dst_area->addr)
 749                 return 0;
 750         width = snd_pcm_format_physical_width(format);
 751         if (width <= 0)
 752                 return -EINVAL;
 753         if (src_area->step == (unsigned int) width &&
 754             dst_area->step == (unsigned int) width && width >= 8) {
 755                 size_t bytes = samples * width / 8;
 756                 memcpy(dst, src, bytes);
 757                 return 0;
 758         }
 759         src_step = src_area->step / 8;
 760         dst_step = dst_area->step / 8;
 761         if (width == 4) {
 762                 /* Ima ADPCM */
 763                 int srcbit = src_area->first % 8;
 764                 int srcbit_step = src_area->step % 8;
 765                 int dstbit = dst_area->first % 8;
 766                 int dstbit_step = dst_area->step % 8;
 767                 while (samples-- > 0) {
 768                         unsigned char srcval;
 769                         if (srcbit)
 770                                 srcval = *src & 0x0f;
 771                         else
 772                                 srcval = (*src & 0xf0) >> 4;
 773                         if (dstbit)
 774                                 *dst = (*dst & 0xf0) | srcval;
 775                         else
 776                                 *dst = (*dst & 0x0f) | (srcval << 4);
 777                         src += src_step;
 778                         srcbit += srcbit_step;
 779                         if (srcbit == 8) {
 780                                 src++;
 781                                 srcbit = 0;
 782                         }
 783                         dst += dst_step;
 784                         dstbit += dstbit_step;
 785                         if (dstbit == 8) {
 786                                 dst++;
 787                                 dstbit = 0;
 788                         }
 789                 }
 790         } else {
 791                 width /= 8;
 792                 while (samples-- > 0) {
 793                         memcpy(dst, src, width);
 794                         src += src_step;
 795                         dst += dst_step;
 796                 }
 797         }
 798         return 0;
 799 }