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 = 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 (check_size && plugin->buf_frames &&
 209                     frames > plugin->buf_frames)
 210                         frames = plugin->buf_frames;
 211                 if (plugin->dst_frames) {
 212                         frames = plugin->dst_frames(plugin, frames);
 213                         if (frames < 0)
 214                                 return frames;
 215                 }
 216                 plugin = plugin_next;
 217         }
 218         return frames;
 219 }
 220
 221 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
 222                                          snd_pcm_sframes_t frames,
 223                                          bool check_size)
 224 {
 225         struct snd_pcm_plugin *plugin, *plugin_prev;
 226
 227         plugin = snd_pcm_plug_last(plug);
 228         while (plugin && frames > 0) {
 229                 plugin_prev = plugin->prev;
 230                 if (plugin->src_frames) {
 231                         frames = plugin->src_frames(plugin, frames);
 232                         if (frames < 0)
 233                                 return frames;
 234                 }
 235                 if (check_size && plugin->buf_frames &&
 236                     frames > plugin->buf_frames)
 237                         frames = plugin->buf_frames;
 238                 plugin = plugin_prev;
 239         }
 240         return frames;
 241 }
 242
 243 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
 244 {
 245         if (snd_BUG_ON(!plug))
 246                 return -ENXIO;
 247         switch (snd_pcm_plug_stream(plug)) {
 248         case SNDRV_PCM_STREAM_PLAYBACK:
 249                 return calc_src_frames(plug, drv_frames, false);
 250         case SNDRV_PCM_STREAM_CAPTURE:
 251                 return calc_dst_frames(plug, drv_frames, false);
 252         default:
 253                 snd_BUG();
 254                 return -EINVAL;
 255         }
 256 }
 257
 258 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
 259 {
 260         if (snd_BUG_ON(!plug))
 261                 return -ENXIO;
 262         switch (snd_pcm_plug_stream(plug)) {
 263         case SNDRV_PCM_STREAM_PLAYBACK:
 264                 return calc_dst_frames(plug, clt_frames, false);
 265         case SNDRV_PCM_STREAM_CAPTURE:
 266                 return calc_src_frames(plug, clt_frames, false);
 267         default:
 268                 snd_BUG();
 269                 return -EINVAL;
 270         }
 271 }
 272
 273 static int snd_pcm_plug_formats(const struct snd_mask *mask,
 274                                 snd_pcm_format_t format)
 275 {
 276         struct snd_mask formats = *mask;
 277         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 278                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 279                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 280                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 281                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 282                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
 283                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
 284                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 285                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 286         snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
 287
 288         if (formats.bits[0] & lower_32_bits(linfmts))
 289                 formats.bits[0] |= lower_32_bits(linfmts);
 290         if (formats.bits[1] & upper_32_bits(linfmts))
 291                 formats.bits[1] |= upper_32_bits(linfmts);
 292         return snd_mask_test(&formats, (__force int)format);
 293 }
 294
 295 static const snd_pcm_format_t preferred_formats[] = {
 296         SNDRV_PCM_FORMAT_S16_LE,
 297         SNDRV_PCM_FORMAT_S16_BE,
 298         SNDRV_PCM_FORMAT_U16_LE,
 299         SNDRV_PCM_FORMAT_U16_BE,
 300         SNDRV_PCM_FORMAT_S24_3LE,
 301         SNDRV_PCM_FORMAT_S24_3BE,
 302         SNDRV_PCM_FORMAT_U24_3LE,
 303         SNDRV_PCM_FORMAT_U24_3BE,
 304         SNDRV_PCM_FORMAT_S24_LE,
 305         SNDRV_PCM_FORMAT_S24_BE,
 306         SNDRV_PCM_FORMAT_U24_LE,
 307         SNDRV_PCM_FORMAT_U24_BE,
 308         SNDRV_PCM_FORMAT_S32_LE,
 309         SNDRV_PCM_FORMAT_S32_BE,
 310         SNDRV_PCM_FORMAT_U32_LE,
 311         SNDRV_PCM_FORMAT_U32_BE,
 312         SNDRV_PCM_FORMAT_S8,
 313         SNDRV_PCM_FORMAT_U8
 314 };
 315
 316 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
 317                                            const struct snd_mask *format_mask)
 318 {
 319         int i;
 320
 321         if (snd_mask_test(format_mask, (__force int)format))
 322                 return format;
 323         if (!snd_pcm_plug_formats(format_mask, format))
 324                 return (__force snd_pcm_format_t)-EINVAL;
 325         if (snd_pcm_format_linear(format)) {
 326                 unsigned int width = snd_pcm_format_width(format);
 327                 int unsignd = snd_pcm_format_unsigned(format) > 0;
 328                 int big = snd_pcm_format_big_endian(format) > 0;
 329                 unsigned int badness, best = -1;
 330                 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
 331                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
 332                         snd_pcm_format_t f = preferred_formats[i];
 333                         unsigned int w;
 334                         if (!snd_mask_test(format_mask, (__force int)f))
 335                                 continue;
 336                         w = snd_pcm_format_width(f);
 337                         if (w >= width)
 338                                 badness = w - width;
 339                         else
 340                                 badness = width - w + 32;
 341                         badness += snd_pcm_format_unsigned(f) != unsignd;
 342                         badness += snd_pcm_format_big_endian(f) != big;
 343                         if (badness < best) {
 344                                 best_format = f;
 345                                 best = badness;
 346                         }
 347                 }
 348                 if ((__force int)best_format >= 0)
 349                         return best_format;
 350                 else
 351                         return (__force snd_pcm_format_t)-EINVAL;
 352         } else {
 353                 switch (format) {
 354                 case SNDRV_PCM_FORMAT_MU_LAW:
 355                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
 356                                 snd_pcm_format_t format1 = preferred_formats[i];
 357                                 if (snd_mask_test(format_mask, (__force int)format1))
 358                                         return format1;
 359                         }
 360                         /* fall through */
 361                 default:
 362                         return (__force snd_pcm_format_t)-EINVAL;
 363                 }
 364         }
 365 }
 366
 367 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
 368                                 struct snd_pcm_hw_params *params,
 369                                 struct snd_pcm_hw_params *slave_params)
 370 {
 371         struct snd_pcm_plugin_format tmpformat;
 372         struct snd_pcm_plugin_format dstformat;
 373         struct snd_pcm_plugin_format srcformat;
 374         snd_pcm_access_t src_access, dst_access;
 375         struct snd_pcm_plugin *plugin = NULL;
 376         int err;
 377         int stream = snd_pcm_plug_stream(plug);
 378         int slave_interleaved = (params_channels(slave_params) == 1 ||
 379                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 380
 381         switch (stream) {
 382         case SNDRV_PCM_STREAM_PLAYBACK:
 383                 dstformat.format = params_format(slave_params);
 384                 dstformat.rate = params_rate(slave_params);
 385                 dstformat.channels = params_channels(slave_params);
 386                 srcformat.format = params_format(params);
 387                 srcformat.rate = params_rate(params);
 388                 srcformat.channels = params_channels(params);
 389                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 390                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 391                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 392                 break;
 393         case SNDRV_PCM_STREAM_CAPTURE:
 394                 dstformat.format = params_format(params);
 395                 dstformat.rate = params_rate(params);
 396                 dstformat.channels = params_channels(params);
 397                 srcformat.format = params_format(slave_params);
 398                 srcformat.rate = params_rate(slave_params);
 399                 srcformat.channels = params_channels(slave_params);
 400                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 401                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 402                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 403                 break;
 404         default:
 405                 snd_BUG();
 406                 return -EINVAL;
 407         }
 408         tmpformat = srcformat;
 409
 410         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 411                  srcformat.format,
 412                  srcformat.rate,
 413                  srcformat.channels);
 414         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 415                  dstformat.format,
 416                  dstformat.rate,
 417                  dstformat.channels);
 418
 419         /* Format change (linearization) */
 420         if (! rate_match(srcformat.rate, dstformat.rate) &&
 421             ! snd_pcm_format_linear(srcformat.format)) {
 422                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
 423                         return -EINVAL;
 424                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
 425                 err = snd_pcm_plugin_build_mulaw(plug,
 426                                                  &srcformat, &tmpformat,
 427                                                  &plugin);
 428                 if (err < 0)
 429                         return err;
 430                 err = snd_pcm_plugin_append(plugin);
 431                 if (err < 0) {
 432                         snd_pcm_plugin_free(plugin);
 433                         return err;
 434                 }
 435                 srcformat = tmpformat;
 436                 src_access = dst_access;
 437         }
 438
 439         /* channels reduction */
 440         if (srcformat.channels > dstformat.channels) {
 441                 tmpformat.channels = dstformat.channels;
 442                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 443                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 444                 if (err < 0)
 445                         return err;
 446                 err = snd_pcm_plugin_append(plugin);
 447                 if (err < 0) {
 448                         snd_pcm_plugin_free(plugin);
 449                         return err;
 450                 }
 451                 srcformat = tmpformat;
 452                 src_access = dst_access;
 453         }
 454
 455         /* rate resampling */
 456         if (!rate_match(srcformat.rate, dstformat.rate)) {
 457                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
 458                         /* convert to S16 for resampling */
 459                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 460                         err = snd_pcm_plugin_build_linear(plug,
 461                                                           &srcformat, &tmpformat,
 462                                                           &plugin);
 463                         if (err < 0)
 464                                 return err;
 465                         err = snd_pcm_plugin_append(plugin);
 466                         if (err < 0) {
 467                                 snd_pcm_plugin_free(plugin);
 468                                 return err;
 469                         }
 470                         srcformat = tmpformat;
 471                         src_access = dst_access;
 472                 }
 473                 tmpformat.rate = dstformat.rate;
 474                 err = snd_pcm_plugin_build_rate(plug,
 475                                                 &srcformat, &tmpformat,
 476                                                 &plugin);
 477                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
 478                 if (err < 0)
 479                         return err;
 480                 err = snd_pcm_plugin_append(plugin);
 481                 if (err < 0) {
 482                         snd_pcm_plugin_free(plugin);
 483                         return err;
 484                 }
 485                 srcformat = tmpformat;
 486                 src_access = dst_access;
 487         }
 488
 489         /* format change */
 490         if (srcformat.format != dstformat.format) {
 491                 tmpformat.format = dstformat.format;
 492                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
 493                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 494                         err = snd_pcm_plugin_build_mulaw(plug,
 495                                                          &srcformat, &tmpformat,
 496                                                          &plugin);
 497                 }
 498                 else if (snd_pcm_format_linear(srcformat.format) &&
 499                          snd_pcm_format_linear(tmpformat.format)) {
 500                         err = snd_pcm_plugin_build_linear(plug,
 501                                                           &srcformat, &tmpformat,
 502                                                           &plugin);
 503                 }
 504                 else
 505                         return -EINVAL;
 506                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 507                 if (err < 0)
 508                         return err;
 509                 err = snd_pcm_plugin_append(plugin);
 510                 if (err < 0) {
 511                         snd_pcm_plugin_free(plugin);
 512                         return err;
 513                 }
 514                 srcformat = tmpformat;
 515                 src_access = dst_access;
 516         }
 517
 518         /* channels extension */
 519         if (srcformat.channels < dstformat.channels) {
 520                 tmpformat.channels = dstformat.channels;
 521                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 522                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 523                 if (err < 0)
 524                         return err;
 525                 err = snd_pcm_plugin_append(plugin);
 526                 if (err < 0) {
 527                         snd_pcm_plugin_free(plugin);
 528                         return err;
 529                 }
 530                 srcformat = tmpformat;
 531                 src_access = dst_access;
 532         }
 533
 534         /* de-interleave */
 535         if (src_access != dst_access) {
 536                 err = snd_pcm_plugin_build_copy(plug,
 537                                                 &srcformat,
 538                                                 &tmpformat,
 539                                                 &plugin);
 540                 pdprintf("interleave change (copy: returns %i)\n", err);
 541                 if (err < 0)
 542                         return err;
 543                 err = snd_pcm_plugin_append(plugin);
 544                 if (err < 0) {
 545                         snd_pcm_plugin_free(plugin);
 546                         return err;
 547                 }
 548         }
 549
 550         return 0;
 551 }
 552
 553 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
 554                                          char *buf,
 555                                          snd_pcm_uframes_t count,
 556                                          struct snd_pcm_plugin_channel **channels)
 557 {
 558         struct snd_pcm_plugin *plugin;
 559         struct snd_pcm_plugin_channel *v;
 560         struct snd_pcm_plugin_format *format;
 561         int width, nchannels, channel;
 562         int stream = snd_pcm_plug_stream(plug);
 563
 564         if (snd_BUG_ON(!buf))
 565                 return -ENXIO;
 566         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 567                 plugin = snd_pcm_plug_first(plug);
 568                 format = &plugin->src_format;
 569         } else {
 570                 plugin = snd_pcm_plug_last(plug);
 571                 format = &plugin->dst_format;
 572         }
 573         v = plugin->buf_channels;
 574         *channels = v;
 575         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
 576                 return width;
 577         nchannels = format->channels;
 578         if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
 579                        format->channels > 1))
 580                 return -ENXIO;
 581         for (channel = 0; channel < nchannels; channel++, v++) {
 582                 v->frames = count;
 583                 v->enabled = 1;
 584                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 585                 v->area.addr = buf;
 586                 v->area.first = channel * width;
 587                 v->area.step = nchannels * width;
 588         }
 589         return count;
 590 }
 591
 592 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)
 593 {
 594         struct snd_pcm_plugin *plugin, *next;
 595         struct snd_pcm_plugin_channel *dst_channels;
 596         int err;
 597         snd_pcm_sframes_t frames = size;
 598
 599         plugin = snd_pcm_plug_first(plug);
 600         while (plugin) {
 601                 if (frames <= 0)
 602                         return frames;
 603                 if ((next = plugin->next) != NULL) {
 604                         snd_pcm_sframes_t frames1 = frames;
 605                         if (plugin->dst_frames) {
 606                                 frames1 = plugin->dst_frames(plugin, frames);
 607                                 if (frames1 <= 0)
 608                                         return frames1;
 609                         }
 610                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
 611                                 return err;
 612                         }
 613                         if (err != frames1) {
 614                                 frames = err;
 615                                 if (plugin->src_frames) {
 616                                         frames = plugin->src_frames(plugin, frames1);
 617                                         if (frames <= 0)
 618                                                 return frames;
 619                                 }
 620                         }
 621                 } else
 622                         dst_channels = NULL;
 623                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 624                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 625                         return frames;
 626                 src_channels = dst_channels;
 627                 plugin = next;
 628         }
 629         return calc_src_frames(plug, frames, true);
 630 }
 631
 632 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)
 633 {
 634         struct snd_pcm_plugin *plugin, *next;
 635         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
 636         snd_pcm_sframes_t frames = size;
 637         int err;
 638
 639         frames = calc_src_frames(plug, frames, true);
 640         if (frames < 0)
 641                 return frames;
 642
 643         src_channels = NULL;
 644         plugin = snd_pcm_plug_first(plug);
 645         while (plugin && frames > 0) {
 646                 if ((next = plugin->next) != NULL) {
 647                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
 648                                 return err;
 649                         }
 650                         frames = err;
 651                 } else {
 652                         dst_channels = dst_channels_final;
 653                 }
 654                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 655                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 656                         return frames;
 657                 plugin = next;
 658                 src_channels = dst_channels;
 659         }
 660         return frames;
 661 }
 662
 663 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 664                          size_t samples, snd_pcm_format_t format)
 665 {
 666         /* FIXME: sub byte resolution and odd dst_offset */
 667         unsigned char *dst;
 668         unsigned int dst_step;
 669         int width;
 670         const unsigned char *silence;
 671         if (!dst_area->addr)
 672                 return 0;
 673         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 674         width = snd_pcm_format_physical_width(format);
 675         if (width <= 0)
 676                 return -EINVAL;
 677         if (dst_area->step == (unsigned int) width && width >= 8)
 678                 return snd_pcm_format_set_silence(format, dst, samples);
 679         silence = snd_pcm_format_silence_64(format);
 680         if (! silence)
 681                 return -EINVAL;
 682         dst_step = dst_area->step / 8;
 683         if (width == 4) {
 684                 /* Ima ADPCM */
 685                 int dstbit = dst_area->first % 8;
 686                 int dstbit_step = dst_area->step % 8;
 687                 while (samples-- > 0) {
 688                         if (dstbit)
 689                                 *dst &= 0xf0;
 690                         else
 691                                 *dst &= 0x0f;
 692                         dst += dst_step;
 693                         dstbit += dstbit_step;
 694                         if (dstbit == 8) {
 695                                 dst++;
 696                                 dstbit = 0;
 697                         }
 698                 }
 699         } else {
 700                 width /= 8;
 701                 while (samples-- > 0) {
 702                         memcpy(dst, silence, width);
 703                         dst += dst_step;
 704                 }
 705         }
 706         return 0;
 707 }
 708
 709 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
 710                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 711                       size_t samples, snd_pcm_format_t format)
 712 {
 713         /* FIXME: sub byte resolution and odd dst_offset */
 714         char *src, *dst;
 715         int width;
 716         int src_step, dst_step;
 717         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 718         if (!src_area->addr)
 719                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 720         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 721         if (!dst_area->addr)
 722                 return 0;
 723         width = snd_pcm_format_physical_width(format);
 724         if (width <= 0)
 725                 return -EINVAL;
 726         if (src_area->step == (unsigned int) width &&
 727             dst_area->step == (unsigned int) width && width >= 8) {
 728                 size_t bytes = samples * width / 8;
 729                 memcpy(dst, src, bytes);
 730                 return 0;
 731         }
 732         src_step = src_area->step / 8;
 733         dst_step = dst_area->step / 8;
 734         if (width == 4) {
 735                 /* Ima ADPCM */
 736                 int srcbit = src_area->first % 8;
 737                 int srcbit_step = src_area->step % 8;
 738                 int dstbit = dst_area->first % 8;
 739                 int dstbit_step = dst_area->step % 8;
 740                 while (samples-- > 0) {
 741                         unsigned char srcval;
 742                         if (srcbit)
 743                                 srcval = *src & 0x0f;
 744                         else
 745                                 srcval = (*src & 0xf0) >> 4;
 746                         if (dstbit)
 747                                 *dst = (*dst & 0xf0) | srcval;
 748                         else
 749                                 *dst = (*dst & 0x0f) | (srcval << 4);
 750                         src += src_step;
 751                         srcbit += srcbit_step;
 752                         if (srcbit == 8) {
 753                                 src++;
 754                                 srcbit = 0;
 755                         }
 756                         dst += dst_step;
 757                         dstbit += dstbit_step;
 758                         if (dstbit == 8) {
 759                                 dst++;
 760                                 dstbit = 0;
 761                         }
 762                 }
 763         } else {
 764                 width /= 8;
 765                 while (samples-- > 0) {
 766                         memcpy(dst, src, width);
 767                         src += src_step;
 768                         dst += dst_step;
 769                 }
 770         }
 771         return 0;
 772 }