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