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         width = snd_pcm_format_physical_width(format->format);
  63         if (width < 0)
  64                 return width;
  65         size = frames * format->channels * width;
  66         if (snd_BUG_ON(size % 8))
  67                 return -ENXIO;
  68         size /= 8;
  69         if (plugin->buf_frames < frames) {
  70                 kvfree(plugin->buf);
  71                 plugin->buf = kvzalloc(size, GFP_KERNEL);
  72                 plugin->buf_frames = frames;
  73         }
  74         if (!plugin->buf) {
  75                 plugin->buf_frames = 0;
  76                 return -ENOMEM;
  77         }
  78         c = plugin->buf_channels;
  79         if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
  80                 for (channel = 0; channel < format->channels; channel++, c++) {
  81                         c->frames = frames;
  82                         c->enabled = 1;
  83                         c->wanted = 0;
  84                         c->area.addr = plugin->buf;
  85                         c->area.first = channel * width;
  86                         c->area.step = format->channels * width;
  87                 }
  88         } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
  89                 if (snd_BUG_ON(size % format->channels))
  90                         return -EINVAL;
  91                 size /= format->channels;
  92                 for (channel = 0; channel < format->channels; channel++, c++) {
  93                         c->frames = frames;
  94                         c->enabled = 1;
  95                         c->wanted = 0;
  96                         c->area.addr = plugin->buf + (channel * size);
  97                         c->area.first = 0;
  98                         c->area.step = width;
  99                 }
 100         } else
 101                 return -EINVAL;
 102         return 0;
 103 }
 104
 105 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
 106 {
 107         int err;
 108         if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
 109                 return -ENXIO;
 110         if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
 111                 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
 112                 while (plugin->next) {
 113                         if (plugin->dst_frames)
 114                                 frames = plugin->dst_frames(plugin, frames);
 115                         if ((snd_pcm_sframes_t)frames <= 0)
 116                                 return -ENXIO;
 117                         plugin = plugin->next;
 118                         err = snd_pcm_plugin_alloc(plugin, frames);
 119                         if (err < 0)
 120                                 return err;
 121                 }
 122         } else {
 123                 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
 124                 while (plugin->prev) {
 125                         if (plugin->src_frames)
 126                                 frames = plugin->src_frames(plugin, frames);
 127                         if ((snd_pcm_sframes_t)frames <= 0)
 128                                 return -ENXIO;
 129                         plugin = plugin->prev;
 130                         err = snd_pcm_plugin_alloc(plugin, frames);
 131                         if (err < 0)
 132                                 return err;
 133                 }
 134         }
 135         return 0;
 136 }
 137
 138
 139 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
 140                                        snd_pcm_uframes_t frames,
 141                                        struct snd_pcm_plugin_channel **channels)
 142 {
 143         *channels = plugin->buf_channels;
 144         return frames;
 145 }
 146
 147 int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
 148                          const char *name,
 149                          struct snd_pcm_plugin_format *src_format,
 150                          struct snd_pcm_plugin_format *dst_format,
 151                          size_t extra,
 152                          struct snd_pcm_plugin **ret)
 153 {
 154         struct snd_pcm_plugin *plugin;
 155         unsigned int channels;
 156
 157         if (snd_BUG_ON(!plug))
 158                 return -ENXIO;
 159         if (snd_BUG_ON(!src_format || !dst_format))
 160                 return -ENXIO;
 161         plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
 162         if (plugin == NULL)
 163                 return -ENOMEM;
 164         plugin->name = name;
 165         plugin->plug = plug;
 166         plugin->stream = snd_pcm_plug_stream(plug);
 167         plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 168         plugin->src_format = *src_format;
 169         plugin->src_width = snd_pcm_format_physical_width(src_format->format);
 170         snd_BUG_ON(plugin->src_width <= 0);
 171         plugin->dst_format = *dst_format;
 172         plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
 173         snd_BUG_ON(plugin->dst_width <= 0);
 174         if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
 175                 channels = src_format->channels;
 176         else
 177                 channels = dst_format->channels;
 178         plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
 179         if (plugin->buf_channels == NULL) {
 180                 snd_pcm_plugin_free(plugin);
 181                 return -ENOMEM;
 182         }
 183         plugin->client_channels = snd_pcm_plugin_client_channels;
 184         *ret = plugin;
 185         return 0;
 186 }
 187
 188 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
 189 {
 190         if (! plugin)
 191                 return 0;
 192         if (plugin->private_free)
 193                 plugin->private_free(plugin);
 194         kfree(plugin->buf_channels);
 195         kvfree(plugin->buf);
 196         kfree(plugin);
 197         return 0;
 198 }
 199
 200 static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
 201                                          snd_pcm_sframes_t frames,
 202                                          bool check_size)
 203 {
 204         struct snd_pcm_plugin *plugin, *plugin_next;
 205
 206         plugin = snd_pcm_plug_first(plug);
 207         while (plugin && frames > 0) {
 208                 plugin_next = plugin->next;
 209                 if (check_size && plugin->buf_frames &&
 210                     frames > plugin->buf_frames)
 211                         frames = plugin->buf_frames;
 212                 if (plugin->dst_frames) {
 213                         frames = plugin->dst_frames(plugin, frames);
 214                         if (frames < 0)
 215                                 return frames;
 216                 }
 217                 plugin = plugin_next;
 218         }
 219         return frames;
 220 }
 221
 222 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
 223                                          snd_pcm_sframes_t frames,
 224                                          bool check_size)
 225 {
 226         struct snd_pcm_plugin *plugin, *plugin_prev;
 227
 228         plugin = snd_pcm_plug_last(plug);
 229         while (plugin && frames > 0) {
 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                 if (check_size && plugin->buf_frames &&
 237                     frames > plugin->buf_frames)
 238                         frames = plugin->buf_frames;
 239                 plugin = plugin_prev;
 240         }
 241         return frames;
 242 }
 243
 244 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
 245 {
 246         if (snd_BUG_ON(!plug))
 247                 return -ENXIO;
 248         switch (snd_pcm_plug_stream(plug)) {
 249         case SNDRV_PCM_STREAM_PLAYBACK:
 250                 return calc_src_frames(plug, drv_frames, false);
 251         case SNDRV_PCM_STREAM_CAPTURE:
 252                 return calc_dst_frames(plug, drv_frames, false);
 253         default:
 254                 snd_BUG();
 255                 return -EINVAL;
 256         }
 257 }
 258
 259 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
 260 {
 261         if (snd_BUG_ON(!plug))
 262                 return -ENXIO;
 263         switch (snd_pcm_plug_stream(plug)) {
 264         case SNDRV_PCM_STREAM_PLAYBACK:
 265                 return calc_dst_frames(plug, clt_frames, false);
 266         case SNDRV_PCM_STREAM_CAPTURE:
 267                 return calc_src_frames(plug, clt_frames, false);
 268         default:
 269                 snd_BUG();
 270                 return -EINVAL;
 271         }
 272 }
 273
 274 static int snd_pcm_plug_formats(const struct snd_mask *mask,
 275                                 snd_pcm_format_t format)
 276 {
 277         struct snd_mask formats = *mask;
 278         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 279                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 280                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 281                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 282                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 283                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
 284                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
 285                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 286                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 287         snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
 288
 289         if (formats.bits[0] & lower_32_bits(linfmts))
 290                 formats.bits[0] |= lower_32_bits(linfmts);
 291         if (formats.bits[1] & upper_32_bits(linfmts))
 292                 formats.bits[1] |= upper_32_bits(linfmts);
 293         return snd_mask_test(&formats, (__force int)format);
 294 }
 295
 296 static const snd_pcm_format_t preferred_formats[] = {
 297         SNDRV_PCM_FORMAT_S16_LE,
 298         SNDRV_PCM_FORMAT_S16_BE,
 299         SNDRV_PCM_FORMAT_U16_LE,
 300         SNDRV_PCM_FORMAT_U16_BE,
 301         SNDRV_PCM_FORMAT_S24_3LE,
 302         SNDRV_PCM_FORMAT_S24_3BE,
 303         SNDRV_PCM_FORMAT_U24_3LE,
 304         SNDRV_PCM_FORMAT_U24_3BE,
 305         SNDRV_PCM_FORMAT_S24_LE,
 306         SNDRV_PCM_FORMAT_S24_BE,
 307         SNDRV_PCM_FORMAT_U24_LE,
 308         SNDRV_PCM_FORMAT_U24_BE,
 309         SNDRV_PCM_FORMAT_S32_LE,
 310         SNDRV_PCM_FORMAT_S32_BE,
 311         SNDRV_PCM_FORMAT_U32_LE,
 312         SNDRV_PCM_FORMAT_U32_BE,
 313         SNDRV_PCM_FORMAT_S8,
 314         SNDRV_PCM_FORMAT_U8
 315 };
 316
 317 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
 318                                            const struct snd_mask *format_mask)
 319 {
 320         int i;
 321
 322         if (snd_mask_test(format_mask, (__force int)format))
 323                 return format;
 324         if (!snd_pcm_plug_formats(format_mask, format))
 325                 return (__force snd_pcm_format_t)-EINVAL;
 326         if (snd_pcm_format_linear(format)) {
 327                 unsigned int width = snd_pcm_format_width(format);
 328                 int unsignd = snd_pcm_format_unsigned(format) > 0;
 329                 int big = snd_pcm_format_big_endian(format) > 0;
 330                 unsigned int badness, best = -1;
 331                 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
 332                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
 333                         snd_pcm_format_t f = preferred_formats[i];
 334                         unsigned int w;
 335                         if (!snd_mask_test(format_mask, (__force int)f))
 336                                 continue;
 337                         w = snd_pcm_format_width(f);
 338                         if (w >= width)
 339                                 badness = w - width;
 340                         else
 341                                 badness = width - w + 32;
 342                         badness += snd_pcm_format_unsigned(f) != unsignd;
 343                         badness += snd_pcm_format_big_endian(f) != big;
 344                         if (badness < best) {
 345                                 best_format = f;
 346                                 best = badness;
 347                         }
 348                 }
 349                 if ((__force int)best_format >= 0)
 350                         return best_format;
 351                 else
 352                         return (__force snd_pcm_format_t)-EINVAL;
 353         } else {
 354                 switch (format) {
 355                 case SNDRV_PCM_FORMAT_MU_LAW:
 356                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
 357                                 snd_pcm_format_t format1 = preferred_formats[i];
 358                                 if (snd_mask_test(format_mask, (__force int)format1))
 359                                         return format1;
 360                         }
 361                         fallthrough;
 362                 default:
 363                         return (__force snd_pcm_format_t)-EINVAL;
 364                 }
 365         }
 366 }
 367
 368 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
 369                                 struct snd_pcm_hw_params *params,
 370                                 struct snd_pcm_hw_params *slave_params)
 371 {
 372         struct snd_pcm_plugin_format tmpformat;
 373         struct snd_pcm_plugin_format dstformat;
 374         struct snd_pcm_plugin_format srcformat;
 375         snd_pcm_access_t src_access, dst_access;
 376         struct snd_pcm_plugin *plugin = NULL;
 377         int err;
 378         int stream = snd_pcm_plug_stream(plug);
 379         int slave_interleaved = (params_channels(slave_params) == 1 ||
 380                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 381
 382         switch (stream) {
 383         case SNDRV_PCM_STREAM_PLAYBACK:
 384                 dstformat.format = params_format(slave_params);
 385                 dstformat.rate = params_rate(slave_params);
 386                 dstformat.channels = params_channels(slave_params);
 387                 srcformat.format = params_format(params);
 388                 srcformat.rate = params_rate(params);
 389                 srcformat.channels = params_channels(params);
 390                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 391                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 392                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 393                 break;
 394         case SNDRV_PCM_STREAM_CAPTURE:
 395                 dstformat.format = params_format(params);
 396                 dstformat.rate = params_rate(params);
 397                 dstformat.channels = params_channels(params);
 398                 srcformat.format = params_format(slave_params);
 399                 srcformat.rate = params_rate(slave_params);
 400                 srcformat.channels = params_channels(slave_params);
 401                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 402                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 403                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 404                 break;
 405         default:
 406                 snd_BUG();
 407                 return -EINVAL;
 408         }
 409         tmpformat = srcformat;
 410
 411         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 412                  srcformat.format,
 413                  srcformat.rate,
 414                  srcformat.channels);
 415         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 416                  dstformat.format,
 417                  dstformat.rate,
 418                  dstformat.channels);
 419
 420         /* Format change (linearization) */
 421         if (! rate_match(srcformat.rate, dstformat.rate) &&
 422             ! snd_pcm_format_linear(srcformat.format)) {
 423                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
 424                         return -EINVAL;
 425                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
 426                 err = snd_pcm_plugin_build_mulaw(plug,
 427                                                  &srcformat, &tmpformat,
 428                                                  &plugin);
 429                 if (err < 0)
 430                         return err;
 431                 err = snd_pcm_plugin_append(plugin);
 432                 if (err < 0) {
 433                         snd_pcm_plugin_free(plugin);
 434                         return err;
 435                 }
 436                 srcformat = tmpformat;
 437                 src_access = dst_access;
 438         }
 439
 440         /* channels reduction */
 441         if (srcformat.channels > dstformat.channels) {
 442                 tmpformat.channels = dstformat.channels;
 443                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 444                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 445                 if (err < 0)
 446                         return err;
 447                 err = snd_pcm_plugin_append(plugin);
 448                 if (err < 0) {
 449                         snd_pcm_plugin_free(plugin);
 450                         return err;
 451                 }
 452                 srcformat = tmpformat;
 453                 src_access = dst_access;
 454         }
 455
 456         /* rate resampling */
 457         if (!rate_match(srcformat.rate, dstformat.rate)) {
 458                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
 459                         /* convert to S16 for resampling */
 460                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 461                         err = snd_pcm_plugin_build_linear(plug,
 462                                                           &srcformat, &tmpformat,
 463                                                           &plugin);
 464                         if (err < 0)
 465                                 return err;
 466                         err = snd_pcm_plugin_append(plugin);
 467                         if (err < 0) {
 468                                 snd_pcm_plugin_free(plugin);
 469                                 return err;
 470                         }
 471                         srcformat = tmpformat;
 472                         src_access = dst_access;
 473                 }
 474                 tmpformat.rate = dstformat.rate;
 475                 err = snd_pcm_plugin_build_rate(plug,
 476                                                 &srcformat, &tmpformat,
 477                                                 &plugin);
 478                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
 479                 if (err < 0)
 480                         return err;
 481                 err = snd_pcm_plugin_append(plugin);
 482                 if (err < 0) {
 483                         snd_pcm_plugin_free(plugin);
 484                         return err;
 485                 }
 486                 srcformat = tmpformat;
 487                 src_access = dst_access;
 488         }
 489
 490         /* format change */
 491         if (srcformat.format != dstformat.format) {
 492                 tmpformat.format = dstformat.format;
 493                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
 494                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 495                         err = snd_pcm_plugin_build_mulaw(plug,
 496                                                          &srcformat, &tmpformat,
 497                                                          &plugin);
 498                 }
 499                 else if (snd_pcm_format_linear(srcformat.format) &&
 500                          snd_pcm_format_linear(tmpformat.format)) {
 501                         err = snd_pcm_plugin_build_linear(plug,
 502                                                           &srcformat, &tmpformat,
 503                                                           &plugin);
 504                 }
 505                 else
 506                         return -EINVAL;
 507                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 508                 if (err < 0)
 509                         return err;
 510                 err = snd_pcm_plugin_append(plugin);
 511                 if (err < 0) {
 512                         snd_pcm_plugin_free(plugin);
 513                         return err;
 514                 }
 515                 srcformat = tmpformat;
 516                 src_access = dst_access;
 517         }
 518
 519         /* channels extension */
 520         if (srcformat.channels < dstformat.channels) {
 521                 tmpformat.channels = dstformat.channels;
 522                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 523                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 524                 if (err < 0)
 525                         return err;
 526                 err = snd_pcm_plugin_append(plugin);
 527                 if (err < 0) {
 528                         snd_pcm_plugin_free(plugin);
 529                         return err;
 530                 }
 531                 srcformat = tmpformat;
 532                 src_access = dst_access;
 533         }
 534
 535         /* de-interleave */
 536         if (src_access != dst_access) {
 537                 err = snd_pcm_plugin_build_copy(plug,
 538                                                 &srcformat,
 539                                                 &tmpformat,
 540                                                 &plugin);
 541                 pdprintf("interleave change (copy: returns %i)\n", err);
 542                 if (err < 0)
 543                         return err;
 544                 err = snd_pcm_plugin_append(plugin);
 545                 if (err < 0) {
 546                         snd_pcm_plugin_free(plugin);
 547                         return err;
 548                 }
 549         }
 550
 551         return 0;
 552 }
 553
 554 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
 555                                          char *buf,
 556                                          snd_pcm_uframes_t count,
 557                                          struct snd_pcm_plugin_channel **channels)
 558 {
 559         struct snd_pcm_plugin *plugin;
 560         struct snd_pcm_plugin_channel *v;
 561         struct snd_pcm_plugin_format *format;
 562         int width, nchannels, channel;
 563         int stream = snd_pcm_plug_stream(plug);
 564
 565         if (snd_BUG_ON(!buf))
 566                 return -ENXIO;
 567         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 568                 plugin = snd_pcm_plug_first(plug);
 569                 format = &plugin->src_format;
 570         } else {
 571                 plugin = snd_pcm_plug_last(plug);
 572                 format = &plugin->dst_format;
 573         }
 574         v = plugin->buf_channels;
 575         *channels = v;
 576         width = snd_pcm_format_physical_width(format->format);
 577         if (width < 0)
 578                 return width;
 579         nchannels = format->channels;
 580         if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
 581                        format->channels > 1))
 582                 return -ENXIO;
 583         for (channel = 0; channel < nchannels; channel++, v++) {
 584                 v->frames = count;
 585                 v->enabled = 1;
 586                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 587                 v->area.addr = buf;
 588                 v->area.first = channel * width;
 589                 v->area.step = nchannels * width;
 590         }
 591         return count;
 592 }
 593
 594 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)
 595 {
 596         struct snd_pcm_plugin *plugin, *next;
 597         struct snd_pcm_plugin_channel *dst_channels;
 598         int err;
 599         snd_pcm_sframes_t frames = size;
 600
 601         plugin = snd_pcm_plug_first(plug);
 602         while (plugin) {
 603                 if (frames <= 0)
 604                         return frames;
 605                 next = plugin->next;
 606                 if (next) {
 607                         snd_pcm_sframes_t frames1 = frames;
 608                         if (plugin->dst_frames) {
 609                                 frames1 = plugin->dst_frames(plugin, frames);
 610                                 if (frames1 <= 0)
 611                                         return frames1;
 612                         }
 613                         err = next->client_channels(next, frames1, &dst_channels);
 614                         if (err < 0)
 615                                 return err;
 616                         if (err != frames1) {
 617                                 frames = err;
 618                                 if (plugin->src_frames) {
 619                                         frames = plugin->src_frames(plugin, frames1);
 620                                         if (frames <= 0)
 621                                                 return frames;
 622                                 }
 623                         }
 624                 } else
 625                         dst_channels = NULL;
 626                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 627                 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
 628                 if (frames < 0)
 629                         return frames;
 630                 src_channels = dst_channels;
 631                 plugin = next;
 632         }
 633         return calc_src_frames(plug, frames, true);
 634 }
 635
 636 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)
 637 {
 638         struct snd_pcm_plugin *plugin, *next;
 639         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
 640         snd_pcm_sframes_t frames = size;
 641         int err;
 642
 643         frames = calc_src_frames(plug, frames, true);
 644         if (frames < 0)
 645                 return frames;
 646
 647         src_channels = NULL;
 648         plugin = snd_pcm_plug_first(plug);
 649         while (plugin && frames > 0) {
 650                 next = plugin->next;
 651                 if (next) {
 652                         err = plugin->client_channels(plugin, frames, &dst_channels);
 653                         if (err < 0)
 654                                 return err;
 655                         frames = err;
 656                 } else {
 657                         dst_channels = dst_channels_final;
 658                 }
 659                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 660                 frames = plugin->transfer(plugin, src_channels, dst_channels, frames);
 661                 if (frames < 0)
 662                         return frames;
 663                 plugin = next;
 664                 src_channels = dst_channels;
 665         }
 666         return frames;
 667 }
 668
 669 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 670                          size_t samples, snd_pcm_format_t format)
 671 {
 672         /* FIXME: sub byte resolution and odd dst_offset */
 673         unsigned char *dst;
 674         unsigned int dst_step;
 675         int width;
 676         const unsigned char *silence;
 677         if (!dst_area->addr)
 678                 return 0;
 679         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 680         width = snd_pcm_format_physical_width(format);
 681         if (width <= 0)
 682                 return -EINVAL;
 683         if (dst_area->step == (unsigned int) width && width >= 8)
 684                 return snd_pcm_format_set_silence(format, dst, samples);
 685         silence = snd_pcm_format_silence_64(format);
 686         if (! silence)
 687                 return -EINVAL;
 688         dst_step = dst_area->step / 8;
 689         if (width == 4) {
 690                 /* Ima ADPCM */
 691                 int dstbit = dst_area->first % 8;
 692                 int dstbit_step = dst_area->step % 8;
 693                 while (samples-- > 0) {
 694                         if (dstbit)
 695                                 *dst &= 0xf0;
 696                         else
 697                                 *dst &= 0x0f;
 698                         dst += dst_step;
 699                         dstbit += dstbit_step;
 700                         if (dstbit == 8) {
 701                                 dst++;
 702                                 dstbit = 0;
 703                         }
 704                 }
 705         } else {
 706                 width /= 8;
 707                 while (samples-- > 0) {
 708                         memcpy(dst, silence, width);
 709                         dst += dst_step;
 710                 }
 711         }
 712         return 0;
 713 }
 714
 715 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
 716                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 717                       size_t samples, snd_pcm_format_t format)
 718 {
 719         /* FIXME: sub byte resolution and odd dst_offset */
 720         char *src, *dst;
 721         int width;
 722         int src_step, dst_step;
 723         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 724         if (!src_area->addr)
 725                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 726         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 727         if (!dst_area->addr)
 728                 return 0;
 729         width = snd_pcm_format_physical_width(format);
 730         if (width <= 0)
 731                 return -EINVAL;
 732         if (src_area->step == (unsigned int) width &&
 733             dst_area->step == (unsigned int) width && width >= 8) {
 734                 size_t bytes = samples * width / 8;
 735                 memcpy(dst, src, bytes);
 736                 return 0;
 737         }
 738         src_step = src_area->step / 8;
 739         dst_step = dst_area->step / 8;
 740         if (width == 4) {
 741                 /* Ima ADPCM */
 742                 int srcbit = src_area->first % 8;
 743                 int srcbit_step = src_area->step % 8;
 744                 int dstbit = dst_area->first % 8;
 745                 int dstbit_step = dst_area->step % 8;
 746                 while (samples-- > 0) {
 747                         unsigned char srcval;
 748                         if (srcbit)
 749                                 srcval = *src & 0x0f;
 750                         else
 751                                 srcval = (*src & 0xf0) >> 4;
 752                         if (dstbit)
 753                                 *dst = (*dst & 0xf0) | srcval;
 754                         else
 755                                 *dst = (*dst & 0x0f) | (srcval << 4);
 756                         src += src_step;
 757                         srcbit += srcbit_step;
 758                         if (srcbit == 8) {
 759                                 src++;
 760                                 srcbit = 0;
 761                         }
 762                         dst += dst_step;
 763                         dstbit += dstbit_step;
 764                         if (dstbit == 8) {
 765                                 dst++;
 766                                 dstbit = 0;
 767                         }
 768                 }
 769         } else {
 770                 width /= 8;
 771                 while (samples-- > 0) {
 772                         memcpy(dst, src, width);
 773                         src += src_step;
 774                         dst += dst_step;
 775                 }
 776         }
 777         return 0;
 778 }