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 plug_client_size(struct snd_pcm_substream *plug,
 200                                           snd_pcm_uframes_t drv_frames,
 201                                           bool check_size)
 202 {
 203         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
 204         int stream;
 205
 206         if (snd_BUG_ON(!plug))
 207                 return -ENXIO;
 208         if (drv_frames == 0)
 209                 return 0;
 210         stream = snd_pcm_plug_stream(plug);
 211         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 212                 plugin = snd_pcm_plug_last(plug);
 213                 while (plugin && drv_frames > 0) {
 214                         plugin_prev = plugin->prev;
 215                         if (plugin->src_frames)
 216                                 drv_frames = plugin->src_frames(plugin, drv_frames);
 217                         if (check_size && plugin->buf_frames &&
 218                             drv_frames > plugin->buf_frames)
 219                                 drv_frames = plugin->buf_frames;
 220                         plugin = plugin_prev;
 221                 }
 222         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 223                 plugin = snd_pcm_plug_first(plug);
 224                 while (plugin && drv_frames > 0) {
 225                         plugin_next = plugin->next;
 226                         if (check_size && plugin->buf_frames &&
 227                             drv_frames > plugin->buf_frames)
 228                                 drv_frames = plugin->buf_frames;
 229                         if (plugin->dst_frames)
 230                                 drv_frames = plugin->dst_frames(plugin, drv_frames);
 231                         plugin = plugin_next;
 232                 }
 233         } else
 234                 snd_BUG();
 235         return drv_frames;
 236 }
 237
 238 static snd_pcm_sframes_t plug_slave_size(struct snd_pcm_substream *plug,
 239                                          snd_pcm_uframes_t clt_frames,
 240                                          bool check_size)
 241 {
 242         struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
 243         snd_pcm_sframes_t frames;
 244         int stream;
 245
 246         if (snd_BUG_ON(!plug))
 247                 return -ENXIO;
 248         if (clt_frames == 0)
 249                 return 0;
 250         frames = clt_frames;
 251         stream = snd_pcm_plug_stream(plug);
 252         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 253                 plugin = snd_pcm_plug_first(plug);
 254                 while (plugin && frames > 0) {
 255                         plugin_next = plugin->next;
 256                         if (check_size && plugin->buf_frames &&
 257                             frames > plugin->buf_frames)
 258                                 frames = plugin->buf_frames;
 259                         if (plugin->dst_frames) {
 260                                 frames = plugin->dst_frames(plugin, frames);
 261                                 if (frames < 0)
 262                                         return frames;
 263                         }
 264                         plugin = plugin_next;
 265                 }
 266         } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
 267                 plugin = snd_pcm_plug_last(plug);
 268                 while (plugin) {
 269                         plugin_prev = plugin->prev;
 270                         if (plugin->src_frames) {
 271                                 frames = plugin->src_frames(plugin, frames);
 272                                 if (frames < 0)
 273                                         return frames;
 274                         }
 275                         if (check_size && plugin->buf_frames &&
 276                             frames > plugin->buf_frames)
 277                                 frames = plugin->buf_frames;
 278                         plugin = plugin_prev;
 279                 }
 280         } else
 281                 snd_BUG();
 282         return frames;
 283 }
 284
 285 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug,
 286                                            snd_pcm_uframes_t drv_frames)
 287 {
 288         return plug_client_size(plug, drv_frames, false);
 289 }
 290
 291 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug,
 292                                           snd_pcm_uframes_t clt_frames)
 293 {
 294         return plug_slave_size(plug, clt_frames, false);
 295 }
 296
 297 static int snd_pcm_plug_formats(const struct snd_mask *mask,
 298                                 snd_pcm_format_t format)
 299 {
 300         struct snd_mask formats = *mask;
 301         u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
 302                        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
 303                        SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
 304                        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
 305                        SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
 306                        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
 307                        SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
 308                        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
 309                        SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
 310         snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
 311
 312         if (formats.bits[0] & lower_32_bits(linfmts))
 313                 formats.bits[0] |= lower_32_bits(linfmts);
 314         if (formats.bits[1] & upper_32_bits(linfmts))
 315                 formats.bits[1] |= upper_32_bits(linfmts);
 316         return snd_mask_test(&formats, (__force int)format);
 317 }
 318
 319 static snd_pcm_format_t preferred_formats[] = {
 320         SNDRV_PCM_FORMAT_S16_LE,
 321         SNDRV_PCM_FORMAT_S16_BE,
 322         SNDRV_PCM_FORMAT_U16_LE,
 323         SNDRV_PCM_FORMAT_U16_BE,
 324         SNDRV_PCM_FORMAT_S24_3LE,
 325         SNDRV_PCM_FORMAT_S24_3BE,
 326         SNDRV_PCM_FORMAT_U24_3LE,
 327         SNDRV_PCM_FORMAT_U24_3BE,
 328         SNDRV_PCM_FORMAT_S24_LE,
 329         SNDRV_PCM_FORMAT_S24_BE,
 330         SNDRV_PCM_FORMAT_U24_LE,
 331         SNDRV_PCM_FORMAT_U24_BE,
 332         SNDRV_PCM_FORMAT_S32_LE,
 333         SNDRV_PCM_FORMAT_S32_BE,
 334         SNDRV_PCM_FORMAT_U32_LE,
 335         SNDRV_PCM_FORMAT_U32_BE,
 336         SNDRV_PCM_FORMAT_S8,
 337         SNDRV_PCM_FORMAT_U8
 338 };
 339
 340 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
 341                                            const struct snd_mask *format_mask)
 342 {
 343         int i;
 344
 345         if (snd_mask_test(format_mask, (__force int)format))
 346                 return format;
 347         if (!snd_pcm_plug_formats(format_mask, format))
 348                 return (__force snd_pcm_format_t)-EINVAL;
 349         if (snd_pcm_format_linear(format)) {
 350                 unsigned int width = snd_pcm_format_width(format);
 351                 int unsignd = snd_pcm_format_unsigned(format) > 0;
 352                 int big = snd_pcm_format_big_endian(format) > 0;
 353                 unsigned int badness, best = -1;
 354                 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
 355                 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
 356                         snd_pcm_format_t f = preferred_formats[i];
 357                         unsigned int w;
 358                         if (!snd_mask_test(format_mask, (__force int)f))
 359                                 continue;
 360                         w = snd_pcm_format_width(f);
 361                         if (w >= width)
 362                                 badness = w - width;
 363                         else
 364                                 badness = width - w + 32;
 365                         badness += snd_pcm_format_unsigned(f) != unsignd;
 366                         badness += snd_pcm_format_big_endian(f) != big;
 367                         if (badness < best) {
 368                                 best_format = f;
 369                                 best = badness;
 370                         }
 371                 }
 372                 if ((__force int)best_format >= 0)
 373                         return best_format;
 374                 else
 375                         return (__force snd_pcm_format_t)-EINVAL;
 376         } else {
 377                 switch (format) {
 378                 case SNDRV_PCM_FORMAT_MU_LAW:
 379                         for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
 380                                 snd_pcm_format_t format1 = preferred_formats[i];
 381                                 if (snd_mask_test(format_mask, (__force int)format1))
 382                                         return format1;
 383                         }
 384                         /* fall through */
 385                 default:
 386                         return (__force snd_pcm_format_t)-EINVAL;
 387                 }
 388         }
 389 }
 390
 391 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
 392                                 struct snd_pcm_hw_params *params,
 393                                 struct snd_pcm_hw_params *slave_params)
 394 {
 395         struct snd_pcm_plugin_format tmpformat;
 396         struct snd_pcm_plugin_format dstformat;
 397         struct snd_pcm_plugin_format srcformat;
 398         snd_pcm_access_t src_access, dst_access;
 399         struct snd_pcm_plugin *plugin = NULL;
 400         int err;
 401         int stream = snd_pcm_plug_stream(plug);
 402         int slave_interleaved = (params_channels(slave_params) == 1 ||
 403                                  params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 404
 405         switch (stream) {
 406         case SNDRV_PCM_STREAM_PLAYBACK:
 407                 dstformat.format = params_format(slave_params);
 408                 dstformat.rate = params_rate(slave_params);
 409                 dstformat.channels = params_channels(slave_params);
 410                 srcformat.format = params_format(params);
 411                 srcformat.rate = params_rate(params);
 412                 srcformat.channels = params_channels(params);
 413                 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 414                 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 415                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 416                 break;
 417         case SNDRV_PCM_STREAM_CAPTURE:
 418                 dstformat.format = params_format(params);
 419                 dstformat.rate = params_rate(params);
 420                 dstformat.channels = params_channels(params);
 421                 srcformat.format = params_format(slave_params);
 422                 srcformat.rate = params_rate(slave_params);
 423                 srcformat.channels = params_channels(slave_params);
 424                 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
 425                                                   SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 426                 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
 427                 break;
 428         default:
 429                 snd_BUG();
 430                 return -EINVAL;
 431         }
 432         tmpformat = srcformat;
 433
 434         pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
 435                  srcformat.format,
 436                  srcformat.rate,
 437                  srcformat.channels);
 438         pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
 439                  dstformat.format,
 440                  dstformat.rate,
 441                  dstformat.channels);
 442
 443         /* Format change (linearization) */
 444         if (! rate_match(srcformat.rate, dstformat.rate) &&
 445             ! snd_pcm_format_linear(srcformat.format)) {
 446                 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
 447                         return -EINVAL;
 448                 tmpformat.format = SNDRV_PCM_FORMAT_S16;
 449                 err = snd_pcm_plugin_build_mulaw(plug,
 450                                                  &srcformat, &tmpformat,
 451                                                  &plugin);
 452                 if (err < 0)
 453                         return err;
 454                 err = snd_pcm_plugin_append(plugin);
 455                 if (err < 0) {
 456                         snd_pcm_plugin_free(plugin);
 457                         return err;
 458                 }
 459                 srcformat = tmpformat;
 460                 src_access = dst_access;
 461         }
 462
 463         /* channels reduction */
 464         if (srcformat.channels > dstformat.channels) {
 465                 tmpformat.channels = dstformat.channels;
 466                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 467                 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 468                 if (err < 0)
 469                         return err;
 470                 err = snd_pcm_plugin_append(plugin);
 471                 if (err < 0) {
 472                         snd_pcm_plugin_free(plugin);
 473                         return err;
 474                 }
 475                 srcformat = tmpformat;
 476                 src_access = dst_access;
 477         }
 478
 479         /* rate resampling */
 480         if (!rate_match(srcformat.rate, dstformat.rate)) {
 481                 if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
 482                         /* convert to S16 for resampling */
 483                         tmpformat.format = SNDRV_PCM_FORMAT_S16;
 484                         err = snd_pcm_plugin_build_linear(plug,
 485                                                           &srcformat, &tmpformat,
 486                                                           &plugin);
 487                         if (err < 0)
 488                                 return err;
 489                         err = snd_pcm_plugin_append(plugin);
 490                         if (err < 0) {
 491                                 snd_pcm_plugin_free(plugin);
 492                                 return err;
 493                         }
 494                         srcformat = tmpformat;
 495                         src_access = dst_access;
 496                 }
 497                 tmpformat.rate = dstformat.rate;
 498                 err = snd_pcm_plugin_build_rate(plug,
 499                                                 &srcformat, &tmpformat,
 500                                                 &plugin);
 501                 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
 502                 if (err < 0)
 503                         return err;
 504                 err = snd_pcm_plugin_append(plugin);
 505                 if (err < 0) {
 506                         snd_pcm_plugin_free(plugin);
 507                         return err;
 508                 }
 509                 srcformat = tmpformat;
 510                 src_access = dst_access;
 511         }
 512
 513         /* format change */
 514         if (srcformat.format != dstformat.format) {
 515                 tmpformat.format = dstformat.format;
 516                 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
 517                     tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
 518                         err = snd_pcm_plugin_build_mulaw(plug,
 519                                                          &srcformat, &tmpformat,
 520                                                          &plugin);
 521                 }
 522                 else if (snd_pcm_format_linear(srcformat.format) &&
 523                          snd_pcm_format_linear(tmpformat.format)) {
 524                         err = snd_pcm_plugin_build_linear(plug,
 525                                                           &srcformat, &tmpformat,
 526                                                           &plugin);
 527                 }
 528                 else
 529                         return -EINVAL;
 530                 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
 531                 if (err < 0)
 532                         return err;
 533                 err = snd_pcm_plugin_append(plugin);
 534                 if (err < 0) {
 535                         snd_pcm_plugin_free(plugin);
 536                         return err;
 537                 }
 538                 srcformat = tmpformat;
 539                 src_access = dst_access;
 540         }
 541
 542         /* channels extension */
 543         if (srcformat.channels < dstformat.channels) {
 544                 tmpformat.channels = dstformat.channels;
 545                 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
 546                 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
 547                 if (err < 0)
 548                         return err;
 549                 err = snd_pcm_plugin_append(plugin);
 550                 if (err < 0) {
 551                         snd_pcm_plugin_free(plugin);
 552                         return err;
 553                 }
 554                 srcformat = tmpformat;
 555                 src_access = dst_access;
 556         }
 557
 558         /* de-interleave */
 559         if (src_access != dst_access) {
 560                 err = snd_pcm_plugin_build_copy(plug,
 561                                                 &srcformat,
 562                                                 &tmpformat,
 563                                                 &plugin);
 564                 pdprintf("interleave change (copy: returns %i)\n", err);
 565                 if (err < 0)
 566                         return err;
 567                 err = snd_pcm_plugin_append(plugin);
 568                 if (err < 0) {
 569                         snd_pcm_plugin_free(plugin);
 570                         return err;
 571                 }
 572         }
 573
 574         return 0;
 575 }
 576
 577 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
 578                                          char *buf,
 579                                          snd_pcm_uframes_t count,
 580                                          struct snd_pcm_plugin_channel **channels)
 581 {
 582         struct snd_pcm_plugin *plugin;
 583         struct snd_pcm_plugin_channel *v;
 584         struct snd_pcm_plugin_format *format;
 585         int width, nchannels, channel;
 586         int stream = snd_pcm_plug_stream(plug);
 587
 588         if (snd_BUG_ON(!buf))
 589                 return -ENXIO;
 590         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 591                 plugin = snd_pcm_plug_first(plug);
 592                 format = &plugin->src_format;
 593         } else {
 594                 plugin = snd_pcm_plug_last(plug);
 595                 format = &plugin->dst_format;
 596         }
 597         v = plugin->buf_channels;
 598         *channels = v;
 599         if ((width = snd_pcm_format_physical_width(format->format)) < 0)
 600                 return width;
 601         nchannels = format->channels;
 602         if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
 603                        format->channels > 1))
 604                 return -ENXIO;
 605         for (channel = 0; channel < nchannels; channel++, v++) {
 606                 v->frames = count;
 607                 v->enabled = 1;
 608                 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
 609                 v->area.addr = buf;
 610                 v->area.first = channel * width;
 611                 v->area.step = nchannels * width;
 612         }
 613         return count;
 614 }
 615
 616 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)
 617 {
 618         struct snd_pcm_plugin *plugin, *next;
 619         struct snd_pcm_plugin_channel *dst_channels;
 620         int err;
 621         snd_pcm_sframes_t frames = size;
 622
 623         plugin = snd_pcm_plug_first(plug);
 624         while (plugin) {
 625                 if (frames <= 0)
 626                         return frames;
 627                 if ((next = plugin->next) != NULL) {
 628                         snd_pcm_sframes_t frames1 = frames;
 629                         if (plugin->dst_frames) {
 630                                 frames1 = plugin->dst_frames(plugin, frames);
 631                                 if (frames1 <= 0)
 632                                         return frames1;
 633                         }
 634                         if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
 635                                 return err;
 636                         }
 637                         if (err != frames1) {
 638                                 frames = err;
 639                                 if (plugin->src_frames) {
 640                                         frames = plugin->src_frames(plugin, frames1);
 641                                         if (frames <= 0)
 642                                                 return frames;
 643                                 }
 644                         }
 645                 } else
 646                         dst_channels = NULL;
 647                 pdprintf("write plugin: %s, %li\n", plugin->name, frames);
 648                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 649                         return frames;
 650                 src_channels = dst_channels;
 651                 plugin = next;
 652         }
 653         return plug_client_size(plug, frames, true);
 654 }
 655
 656 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)
 657 {
 658         struct snd_pcm_plugin *plugin, *next;
 659         struct snd_pcm_plugin_channel *src_channels, *dst_channels;
 660         snd_pcm_sframes_t frames = size;
 661         int err;
 662
 663         frames = plug_slave_size(plug, frames, true);
 664         if (frames < 0)
 665                 return frames;
 666
 667         src_channels = NULL;
 668         plugin = snd_pcm_plug_first(plug);
 669         while (plugin && frames > 0) {
 670                 if ((next = plugin->next) != NULL) {
 671                         if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
 672                                 return err;
 673                         }
 674                         frames = err;
 675                 } else {
 676                         dst_channels = dst_channels_final;
 677                 }
 678                 pdprintf("read plugin: %s, %li\n", plugin->name, frames);
 679                 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
 680                         return frames;
 681                 plugin = next;
 682                 src_channels = dst_channels;
 683         }
 684         return frames;
 685 }
 686
 687 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 688                          size_t samples, snd_pcm_format_t format)
 689 {
 690         /* FIXME: sub byte resolution and odd dst_offset */
 691         unsigned char *dst;
 692         unsigned int dst_step;
 693         int width;
 694         const unsigned char *silence;
 695         if (!dst_area->addr)
 696                 return 0;
 697         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 698         width = snd_pcm_format_physical_width(format);
 699         if (width <= 0)
 700                 return -EINVAL;
 701         if (dst_area->step == (unsigned int) width && width >= 8)
 702                 return snd_pcm_format_set_silence(format, dst, samples);
 703         silence = snd_pcm_format_silence_64(format);
 704         if (! silence)
 705                 return -EINVAL;
 706         dst_step = dst_area->step / 8;
 707         if (width == 4) {
 708                 /* Ima ADPCM */
 709                 int dstbit = dst_area->first % 8;
 710                 int dstbit_step = dst_area->step % 8;
 711                 while (samples-- > 0) {
 712                         if (dstbit)
 713                                 *dst &= 0xf0;
 714                         else
 715                                 *dst &= 0x0f;
 716                         dst += dst_step;
 717                         dstbit += dstbit_step;
 718                         if (dstbit == 8) {
 719                                 dst++;
 720                                 dstbit = 0;
 721                         }
 722                 }
 723         } else {
 724                 width /= 8;
 725                 while (samples-- > 0) {
 726                         memcpy(dst, silence, width);
 727                         dst += dst_step;
 728                 }
 729         }
 730         return 0;
 731 }
 732
 733 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
 734                       const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
 735                       size_t samples, snd_pcm_format_t format)
 736 {
 737         /* FIXME: sub byte resolution and odd dst_offset */
 738         char *src, *dst;
 739         int width;
 740         int src_step, dst_step;
 741         src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
 742         if (!src_area->addr)
 743                 return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
 744         dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
 745         if (!dst_area->addr)
 746                 return 0;
 747         width = snd_pcm_format_physical_width(format);
 748         if (width <= 0)
 749                 return -EINVAL;
 750         if (src_area->step == (unsigned int) width &&
 751             dst_area->step == (unsigned int) width && width >= 8) {
 752                 size_t bytes = samples * width / 8;
 753                 memcpy(dst, src, bytes);
 754                 return 0;
 755         }
 756         src_step = src_area->step / 8;
 757         dst_step = dst_area->step / 8;
 758         if (width == 4) {
 759                 /* Ima ADPCM */
 760                 int srcbit = src_area->first % 8;
 761                 int srcbit_step = src_area->step % 8;
 762                 int dstbit = dst_area->first % 8;
 763                 int dstbit_step = dst_area->step % 8;
 764                 while (samples-- > 0) {
 765                         unsigned char srcval;
 766                         if (srcbit)
 767                                 srcval = *src & 0x0f;
 768                         else
 769                                 srcval = (*src & 0xf0) >> 4;
 770                         if (dstbit)
 771                                 *dst = (*dst & 0xf0) | srcval;
 772                         else
 773                                 *dst = (*dst & 0x0f) | (srcval << 4);
 774                         src += src_step;
 775                         srcbit += srcbit_step;
 776                         if (srcbit == 8) {
 777                                 src++;
 778                                 srcbit = 0;
 779                         }
 780                         dst += dst_step;
 781                         dstbit += dstbit_step;
 782                         if (dstbit == 8) {
 783                                 dst++;
 784                                 dstbit = 0;
 785                         }
 786                 }
 787         } else {
 788                 width /= 8;
 789                 while (samples-- > 0) {
 790                         memcpy(dst, src, width);
 791                         src += src_step;
 792                         dst += dst_step;
 793                 }
 794         }
 795         return 0;
 796 }