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 vfree(plugin->buf); 70 plugin->buf = vmalloc(size); 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(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(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 vfree(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 = snd_pcm_plug_stream(plug); 203 204 if (snd_BUG_ON(!plug)) 205 return -ENXIO; 206 if (drv_frames == 0) 207 return 0; 208 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 209 plugin = snd_pcm_plug_last(plug); 210 while (plugin && drv_frames > 0) { 211 plugin_prev = plugin->prev; 212 if (plugin->src_frames) 213 drv_frames = plugin->src_frames(plugin, drv_frames); 214 plugin = plugin_prev; 215 } 216 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) { 217 plugin = snd_pcm_plug_first(plug); 218 while (plugin && drv_frames > 0) { 219 plugin_next = plugin->next; 220 if (plugin->dst_frames) 221 drv_frames = plugin->dst_frames(plugin, drv_frames); 222 plugin = plugin_next; 223 } 224 } else 225 snd_BUG(); 226 return drv_frames; 227 } 228 229 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) 230 { 231 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next; 232 snd_pcm_sframes_t frames; 233 int stream = snd_pcm_plug_stream(plug); 234 235 if (snd_BUG_ON(!plug)) 236 return -ENXIO; 237 if (clt_frames == 0) 238 return 0; 239 frames = clt_frames; 240 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 241 plugin = snd_pcm_plug_first(plug); 242 while (plugin && frames > 0) { 243 plugin_next = plugin->next; 244 if (plugin->dst_frames) { 245 frames = plugin->dst_frames(plugin, frames); 246 if (frames < 0) 247 return frames; 248 } 249 plugin = plugin_next; 250 } 251 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) { 252 plugin = snd_pcm_plug_last(plug); 253 while (plugin) { 254 plugin_prev = plugin->prev; 255 if (plugin->src_frames) { 256 frames = plugin->src_frames(plugin, frames); 257 if (frames < 0) 258 return frames; 259 } 260 plugin = plugin_prev; 261 } 262 } else 263 snd_BUG(); 264 return frames; 265 } 266 267 static int snd_pcm_plug_formats(struct snd_mask *mask, snd_pcm_format_t format) 268 { 269 struct snd_mask formats = *mask; 270 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | 271 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | 272 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | 273 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | 274 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | 275 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | 276 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | 277 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | 278 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); 279 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); 280 281 if (formats.bits[0] & (u32)linfmts) 282 formats.bits[0] |= (u32)linfmts; 283 if (formats.bits[1] & (u32)(linfmts >> 32)) 284 formats.bits[1] |= (u32)(linfmts >> 32); 285 return snd_mask_test(&formats, (__force int)format); 286 } 287 288 static snd_pcm_format_t preferred_formats[] = { 289 SNDRV_PCM_FORMAT_S16_LE, 290 SNDRV_PCM_FORMAT_S16_BE, 291 SNDRV_PCM_FORMAT_U16_LE, 292 SNDRV_PCM_FORMAT_U16_BE, 293 SNDRV_PCM_FORMAT_S24_3LE, 294 SNDRV_PCM_FORMAT_S24_3BE, 295 SNDRV_PCM_FORMAT_U24_3LE, 296 SNDRV_PCM_FORMAT_U24_3BE, 297 SNDRV_PCM_FORMAT_S24_LE, 298 SNDRV_PCM_FORMAT_S24_BE, 299 SNDRV_PCM_FORMAT_U24_LE, 300 SNDRV_PCM_FORMAT_U24_BE, 301 SNDRV_PCM_FORMAT_S32_LE, 302 SNDRV_PCM_FORMAT_S32_BE, 303 SNDRV_PCM_FORMAT_U32_LE, 304 SNDRV_PCM_FORMAT_U32_BE, 305 SNDRV_PCM_FORMAT_S8, 306 SNDRV_PCM_FORMAT_U8 307 }; 308 309 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, 310 struct snd_mask *format_mask) 311 { 312 int i; 313 314 if (snd_mask_test(format_mask, (__force int)format)) 315 return format; 316 if (!snd_pcm_plug_formats(format_mask, format)) 317 return (__force snd_pcm_format_t)-EINVAL; 318 if (snd_pcm_format_linear(format)) { 319 unsigned int width = snd_pcm_format_width(format); 320 int unsignd = snd_pcm_format_unsigned(format) > 0; 321 int big = snd_pcm_format_big_endian(format) > 0; 322 unsigned int badness, best = -1; 323 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; 324 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { 325 snd_pcm_format_t f = preferred_formats[i]; 326 unsigned int w; 327 if (!snd_mask_test(format_mask, (__force int)f)) 328 continue; 329 w = snd_pcm_format_width(f); 330 if (w >= width) 331 badness = w - width; 332 else 333 badness = width - w + 32; 334 badness += snd_pcm_format_unsigned(f) != unsignd; 335 badness += snd_pcm_format_big_endian(f) != big; 336 if (badness < best) { 337 best_format = f; 338 best = badness; 339 } 340 } 341 if ((__force int)best_format >= 0) 342 return best_format; 343 else 344 return (__force snd_pcm_format_t)-EINVAL; 345 } else { 346 switch (format) { 347 case SNDRV_PCM_FORMAT_MU_LAW: 348 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { 349 snd_pcm_format_t format1 = preferred_formats[i]; 350 if (snd_mask_test(format_mask, (__force int)format1)) 351 return format1; 352 } 353 default: 354 return (__force snd_pcm_format_t)-EINVAL; 355 } 356 } 357 } 358 359 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 360 struct snd_pcm_hw_params *params, 361 struct snd_pcm_hw_params *slave_params) 362 { 363 struct snd_pcm_plugin_format tmpformat; 364 struct snd_pcm_plugin_format dstformat; 365 struct snd_pcm_plugin_format srcformat; 366 snd_pcm_access_t src_access, dst_access; 367 struct snd_pcm_plugin *plugin = NULL; 368 int err; 369 int stream = snd_pcm_plug_stream(plug); 370 int slave_interleaved = (params_channels(slave_params) == 1 || 371 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 372 373 switch (stream) { 374 case SNDRV_PCM_STREAM_PLAYBACK: 375 dstformat.format = params_format(slave_params); 376 dstformat.rate = params_rate(slave_params); 377 dstformat.channels = params_channels(slave_params); 378 srcformat.format = params_format(params); 379 srcformat.rate = params_rate(params); 380 srcformat.channels = params_channels(params); 381 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 382 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 383 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 384 break; 385 case SNDRV_PCM_STREAM_CAPTURE: 386 dstformat.format = params_format(params); 387 dstformat.rate = params_rate(params); 388 dstformat.channels = params_channels(params); 389 srcformat.format = params_format(slave_params); 390 srcformat.rate = params_rate(slave_params); 391 srcformat.channels = params_channels(slave_params); 392 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 393 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 394 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 395 break; 396 default: 397 snd_BUG(); 398 return -EINVAL; 399 } 400 tmpformat = srcformat; 401 402 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 403 srcformat.format, 404 srcformat.rate, 405 srcformat.channels); 406 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 407 dstformat.format, 408 dstformat.rate, 409 dstformat.channels); 410 411 /* Format change (linearization) */ 412 if (! rate_match(srcformat.rate, dstformat.rate) && 413 ! snd_pcm_format_linear(srcformat.format)) { 414 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 415 return -EINVAL; 416 tmpformat.format = SNDRV_PCM_FORMAT_S16; 417 err = snd_pcm_plugin_build_mulaw(plug, 418 &srcformat, &tmpformat, 419 &plugin); 420 if (err < 0) 421 return err; 422 err = snd_pcm_plugin_append(plugin); 423 if (err < 0) { 424 snd_pcm_plugin_free(plugin); 425 return err; 426 } 427 srcformat = tmpformat; 428 src_access = dst_access; 429 } 430 431 /* channels reduction */ 432 if (srcformat.channels > dstformat.channels) { 433 tmpformat.channels = dstformat.channels; 434 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 435 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 436 if (err < 0) 437 return err; 438 err = snd_pcm_plugin_append(plugin); 439 if (err < 0) { 440 snd_pcm_plugin_free(plugin); 441 return err; 442 } 443 srcformat = tmpformat; 444 src_access = dst_access; 445 } 446 447 /* rate resampling */ 448 if (!rate_match(srcformat.rate, dstformat.rate)) { 449 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 450 /* convert to S16 for resampling */ 451 tmpformat.format = SNDRV_PCM_FORMAT_S16; 452 err = snd_pcm_plugin_build_linear(plug, 453 &srcformat, &tmpformat, 454 &plugin); 455 if (err < 0) 456 return err; 457 err = snd_pcm_plugin_append(plugin); 458 if (err < 0) { 459 snd_pcm_plugin_free(plugin); 460 return err; 461 } 462 srcformat = tmpformat; 463 src_access = dst_access; 464 } 465 tmpformat.rate = dstformat.rate; 466 err = snd_pcm_plugin_build_rate(plug, 467 &srcformat, &tmpformat, 468 &plugin); 469 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 470 if (err < 0) 471 return err; 472 err = snd_pcm_plugin_append(plugin); 473 if (err < 0) { 474 snd_pcm_plugin_free(plugin); 475 return err; 476 } 477 srcformat = tmpformat; 478 src_access = dst_access; 479 } 480 481 /* format change */ 482 if (srcformat.format != dstformat.format) { 483 tmpformat.format = dstformat.format; 484 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 485 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 486 err = snd_pcm_plugin_build_mulaw(plug, 487 &srcformat, &tmpformat, 488 &plugin); 489 } 490 else if (snd_pcm_format_linear(srcformat.format) && 491 snd_pcm_format_linear(tmpformat.format)) { 492 err = snd_pcm_plugin_build_linear(plug, 493 &srcformat, &tmpformat, 494 &plugin); 495 } 496 else 497 return -EINVAL; 498 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 499 if (err < 0) 500 return err; 501 err = snd_pcm_plugin_append(plugin); 502 if (err < 0) { 503 snd_pcm_plugin_free(plugin); 504 return err; 505 } 506 srcformat = tmpformat; 507 src_access = dst_access; 508 } 509 510 /* channels extension */ 511 if (srcformat.channels < dstformat.channels) { 512 tmpformat.channels = dstformat.channels; 513 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 514 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 515 if (err < 0) 516 return err; 517 err = snd_pcm_plugin_append(plugin); 518 if (err < 0) { 519 snd_pcm_plugin_free(plugin); 520 return err; 521 } 522 srcformat = tmpformat; 523 src_access = dst_access; 524 } 525 526 /* de-interleave */ 527 if (src_access != dst_access) { 528 err = snd_pcm_plugin_build_copy(plug, 529 &srcformat, 530 &tmpformat, 531 &plugin); 532 pdprintf("interleave change (copy: returns %i)\n", err); 533 if (err < 0) 534 return err; 535 err = snd_pcm_plugin_append(plugin); 536 if (err < 0) { 537 snd_pcm_plugin_free(plugin); 538 return err; 539 } 540 } 541 542 return 0; 543 } 544 545 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 546 char *buf, 547 snd_pcm_uframes_t count, 548 struct snd_pcm_plugin_channel **channels) 549 { 550 struct snd_pcm_plugin *plugin; 551 struct snd_pcm_plugin_channel *v; 552 struct snd_pcm_plugin_format *format; 553 int width, nchannels, channel; 554 int stream = snd_pcm_plug_stream(plug); 555 556 if (snd_BUG_ON(!buf)) 557 return -ENXIO; 558 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 559 plugin = snd_pcm_plug_first(plug); 560 format = &plugin->src_format; 561 } else { 562 plugin = snd_pcm_plug_last(plug); 563 format = &plugin->dst_format; 564 } 565 v = plugin->buf_channels; 566 *channels = v; 567 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 568 return width; 569 nchannels = format->channels; 570 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 571 format->channels > 1)) 572 return -ENXIO; 573 for (channel = 0; channel < nchannels; channel++, v++) { 574 v->frames = count; 575 v->enabled = 1; 576 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 577 v->area.addr = buf; 578 v->area.first = channel * width; 579 v->area.step = nchannels * width; 580 } 581 return count; 582 } 583 584 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) 585 { 586 struct snd_pcm_plugin *plugin, *next; 587 struct snd_pcm_plugin_channel *dst_channels; 588 int err; 589 snd_pcm_sframes_t frames = size; 590 591 plugin = snd_pcm_plug_first(plug); 592 while (plugin && frames > 0) { 593 if ((next = plugin->next) != NULL) { 594 snd_pcm_sframes_t frames1 = frames; 595 if (plugin->dst_frames) 596 frames1 = plugin->dst_frames(plugin, frames); 597 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) { 598 return err; 599 } 600 if (err != frames1) { 601 frames = err; 602 if (plugin->src_frames) 603 frames = plugin->src_frames(plugin, frames1); 604 } 605 } else 606 dst_channels = NULL; 607 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 608 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 609 return frames; 610 src_channels = dst_channels; 611 plugin = next; 612 } 613 return snd_pcm_plug_client_size(plug, frames); 614 } 615 616 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) 617 { 618 struct snd_pcm_plugin *plugin, *next; 619 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 620 snd_pcm_sframes_t frames = size; 621 int err; 622 623 frames = snd_pcm_plug_slave_size(plug, frames); 624 if (frames < 0) 625 return frames; 626 627 src_channels = NULL; 628 plugin = snd_pcm_plug_first(plug); 629 while (plugin && frames > 0) { 630 if ((next = plugin->next) != NULL) { 631 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) { 632 return err; 633 } 634 frames = err; 635 } else { 636 dst_channels = dst_channels_final; 637 } 638 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 639 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 640 return frames; 641 plugin = next; 642 src_channels = dst_channels; 643 } 644 return frames; 645 } 646 647 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 648 size_t samples, snd_pcm_format_t format) 649 { 650 /* FIXME: sub byte resolution and odd dst_offset */ 651 unsigned char *dst; 652 unsigned int dst_step; 653 int width; 654 const unsigned char *silence; 655 if (!dst_area->addr) 656 return 0; 657 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 658 width = snd_pcm_format_physical_width(format); 659 if (width <= 0) 660 return -EINVAL; 661 if (dst_area->step == (unsigned int) width && width >= 8) 662 return snd_pcm_format_set_silence(format, dst, samples); 663 silence = snd_pcm_format_silence_64(format); 664 if (! silence) 665 return -EINVAL; 666 dst_step = dst_area->step / 8; 667 if (width == 4) { 668 /* Ima ADPCM */ 669 int dstbit = dst_area->first % 8; 670 int dstbit_step = dst_area->step % 8; 671 while (samples-- > 0) { 672 if (dstbit) 673 *dst &= 0xf0; 674 else 675 *dst &= 0x0f; 676 dst += dst_step; 677 dstbit += dstbit_step; 678 if (dstbit == 8) { 679 dst++; 680 dstbit = 0; 681 } 682 } 683 } else { 684 width /= 8; 685 while (samples-- > 0) { 686 memcpy(dst, silence, width); 687 dst += dst_step; 688 } 689 } 690 return 0; 691 } 692 693 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 694 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 695 size_t samples, snd_pcm_format_t format) 696 { 697 /* FIXME: sub byte resolution and odd dst_offset */ 698 char *src, *dst; 699 int width; 700 int src_step, dst_step; 701 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 702 if (!src_area->addr) 703 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 704 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 705 if (!dst_area->addr) 706 return 0; 707 width = snd_pcm_format_physical_width(format); 708 if (width <= 0) 709 return -EINVAL; 710 if (src_area->step == (unsigned int) width && 711 dst_area->step == (unsigned int) width && width >= 8) { 712 size_t bytes = samples * width / 8; 713 memcpy(dst, src, bytes); 714 return 0; 715 } 716 src_step = src_area->step / 8; 717 dst_step = dst_area->step / 8; 718 if (width == 4) { 719 /* Ima ADPCM */ 720 int srcbit = src_area->first % 8; 721 int srcbit_step = src_area->step % 8; 722 int dstbit = dst_area->first % 8; 723 int dstbit_step = dst_area->step % 8; 724 while (samples-- > 0) { 725 unsigned char srcval; 726 if (srcbit) 727 srcval = *src & 0x0f; 728 else 729 srcval = (*src & 0xf0) >> 4; 730 if (dstbit) 731 *dst = (*dst & 0xf0) | srcval; 732 else 733 *dst = (*dst & 0x0f) | (srcval << 4); 734 src += src_step; 735 srcbit += srcbit_step; 736 if (srcbit == 8) { 737 src++; 738 srcbit = 0; 739 } 740 dst += dst_step; 741 dstbit += dstbit_step; 742 if (dstbit == 8) { 743 dst++; 744 dstbit = 0; 745 } 746 } 747 } else { 748 width /= 8; 749 while (samples-- > 0) { 750 memcpy(dst, src, width); 751 src += src_step; 752 dst += dst_step; 753 } 754 } 755 return 0; 756 } 757