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, int 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, 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, format); 286 } 287 288 static int 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 int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask) 310 { 311 int i; 312 313 if (snd_mask_test(format_mask, format)) 314 return format; 315 if (! snd_pcm_plug_formats(format_mask, format)) 316 return -EINVAL; 317 if (snd_pcm_format_linear(format)) { 318 unsigned int width = snd_pcm_format_width(format); 319 int unsignd = snd_pcm_format_unsigned(format) > 0; 320 int big = snd_pcm_format_big_endian(format) > 0; 321 unsigned int badness, best = -1; 322 int best_format = -1; 323 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { 324 int f = preferred_formats[i]; 325 unsigned int w; 326 if (!snd_mask_test(format_mask, f)) 327 continue; 328 w = snd_pcm_format_width(f); 329 if (w >= width) 330 badness = w - width; 331 else 332 badness = width - w + 32; 333 badness += snd_pcm_format_unsigned(f) != unsignd; 334 badness += snd_pcm_format_big_endian(f) != big; 335 if (badness < best) { 336 best_format = f; 337 best = badness; 338 } 339 } 340 return best_format >= 0 ? best_format : -EINVAL; 341 } else { 342 switch (format) { 343 case SNDRV_PCM_FORMAT_MU_LAW: 344 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { 345 int format1 = preferred_formats[i]; 346 if (snd_mask_test(format_mask, format1)) 347 return format1; 348 } 349 default: 350 return -EINVAL; 351 } 352 } 353 } 354 355 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 356 struct snd_pcm_hw_params *params, 357 struct snd_pcm_hw_params *slave_params) 358 { 359 struct snd_pcm_plugin_format tmpformat; 360 struct snd_pcm_plugin_format dstformat; 361 struct snd_pcm_plugin_format srcformat; 362 int src_access, dst_access; 363 struct snd_pcm_plugin *plugin = NULL; 364 int err; 365 int stream = snd_pcm_plug_stream(plug); 366 int slave_interleaved = (params_channels(slave_params) == 1 || 367 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 368 369 switch (stream) { 370 case SNDRV_PCM_STREAM_PLAYBACK: 371 dstformat.format = params_format(slave_params); 372 dstformat.rate = params_rate(slave_params); 373 dstformat.channels = params_channels(slave_params); 374 srcformat.format = params_format(params); 375 srcformat.rate = params_rate(params); 376 srcformat.channels = params_channels(params); 377 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 378 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 379 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 380 break; 381 case SNDRV_PCM_STREAM_CAPTURE: 382 dstformat.format = params_format(params); 383 dstformat.rate = params_rate(params); 384 dstformat.channels = params_channels(params); 385 srcformat.format = params_format(slave_params); 386 srcformat.rate = params_rate(slave_params); 387 srcformat.channels = params_channels(slave_params); 388 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 389 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 390 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 391 break; 392 default: 393 snd_BUG(); 394 return -EINVAL; 395 } 396 tmpformat = srcformat; 397 398 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 399 srcformat.format, 400 srcformat.rate, 401 srcformat.channels); 402 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 403 dstformat.format, 404 dstformat.rate, 405 dstformat.channels); 406 407 /* Format change (linearization) */ 408 if (! rate_match(srcformat.rate, dstformat.rate) && 409 ! snd_pcm_format_linear(srcformat.format)) { 410 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 411 return -EINVAL; 412 tmpformat.format = SNDRV_PCM_FORMAT_S16; 413 err = snd_pcm_plugin_build_mulaw(plug, 414 &srcformat, &tmpformat, 415 &plugin); 416 if (err < 0) 417 return err; 418 err = snd_pcm_plugin_append(plugin); 419 if (err < 0) { 420 snd_pcm_plugin_free(plugin); 421 return err; 422 } 423 srcformat = tmpformat; 424 src_access = dst_access; 425 } 426 427 /* channels reduction */ 428 if (srcformat.channels > dstformat.channels) { 429 tmpformat.channels = dstformat.channels; 430 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 431 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 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 /* rate resampling */ 444 if (!rate_match(srcformat.rate, dstformat.rate)) { 445 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 446 /* convert to S16 for resampling */ 447 tmpformat.format = SNDRV_PCM_FORMAT_S16; 448 err = snd_pcm_plugin_build_linear(plug, 449 &srcformat, &tmpformat, 450 &plugin); 451 if (err < 0) 452 return err; 453 err = snd_pcm_plugin_append(plugin); 454 if (err < 0) { 455 snd_pcm_plugin_free(plugin); 456 return err; 457 } 458 srcformat = tmpformat; 459 src_access = dst_access; 460 } 461 tmpformat.rate = dstformat.rate; 462 err = snd_pcm_plugin_build_rate(plug, 463 &srcformat, &tmpformat, 464 &plugin); 465 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 466 if (err < 0) 467 return err; 468 err = snd_pcm_plugin_append(plugin); 469 if (err < 0) { 470 snd_pcm_plugin_free(plugin); 471 return err; 472 } 473 srcformat = tmpformat; 474 src_access = dst_access; 475 } 476 477 /* format change */ 478 if (srcformat.format != dstformat.format) { 479 tmpformat.format = dstformat.format; 480 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 481 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 482 err = snd_pcm_plugin_build_mulaw(plug, 483 &srcformat, &tmpformat, 484 &plugin); 485 } 486 else if (snd_pcm_format_linear(srcformat.format) && 487 snd_pcm_format_linear(tmpformat.format)) { 488 err = snd_pcm_plugin_build_linear(plug, 489 &srcformat, &tmpformat, 490 &plugin); 491 } 492 else 493 return -EINVAL; 494 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 495 if (err < 0) 496 return err; 497 err = snd_pcm_plugin_append(plugin); 498 if (err < 0) { 499 snd_pcm_plugin_free(plugin); 500 return err; 501 } 502 srcformat = tmpformat; 503 src_access = dst_access; 504 } 505 506 /* channels extension */ 507 if (srcformat.channels < dstformat.channels) { 508 tmpformat.channels = dstformat.channels; 509 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 510 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, 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 /* de-interleave */ 523 if (src_access != dst_access) { 524 err = snd_pcm_plugin_build_copy(plug, 525 &srcformat, 526 &tmpformat, 527 &plugin); 528 pdprintf("interleave change (copy: returns %i)\n", err); 529 if (err < 0) 530 return err; 531 err = snd_pcm_plugin_append(plugin); 532 if (err < 0) { 533 snd_pcm_plugin_free(plugin); 534 return err; 535 } 536 } 537 538 return 0; 539 } 540 541 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 542 char *buf, 543 snd_pcm_uframes_t count, 544 struct snd_pcm_plugin_channel **channels) 545 { 546 struct snd_pcm_plugin *plugin; 547 struct snd_pcm_plugin_channel *v; 548 struct snd_pcm_plugin_format *format; 549 int width, nchannels, channel; 550 int stream = snd_pcm_plug_stream(plug); 551 552 if (snd_BUG_ON(!buf)) 553 return -ENXIO; 554 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 555 plugin = snd_pcm_plug_first(plug); 556 format = &plugin->src_format; 557 } else { 558 plugin = snd_pcm_plug_last(plug); 559 format = &plugin->dst_format; 560 } 561 v = plugin->buf_channels; 562 *channels = v; 563 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 564 return width; 565 nchannels = format->channels; 566 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 567 format->channels > 1)) 568 return -ENXIO; 569 for (channel = 0; channel < nchannels; channel++, v++) { 570 v->frames = count; 571 v->enabled = 1; 572 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 573 v->area.addr = buf; 574 v->area.first = channel * width; 575 v->area.step = nchannels * width; 576 } 577 return count; 578 } 579 580 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) 581 { 582 struct snd_pcm_plugin *plugin, *next; 583 struct snd_pcm_plugin_channel *dst_channels; 584 int err; 585 snd_pcm_sframes_t frames = size; 586 587 plugin = snd_pcm_plug_first(plug); 588 while (plugin && frames > 0) { 589 if ((next = plugin->next) != NULL) { 590 snd_pcm_sframes_t frames1 = frames; 591 if (plugin->dst_frames) 592 frames1 = plugin->dst_frames(plugin, frames); 593 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) { 594 return err; 595 } 596 if (err != frames1) { 597 frames = err; 598 if (plugin->src_frames) 599 frames = plugin->src_frames(plugin, frames1); 600 } 601 } else 602 dst_channels = NULL; 603 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 604 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 605 return frames; 606 src_channels = dst_channels; 607 plugin = next; 608 } 609 return snd_pcm_plug_client_size(plug, frames); 610 } 611 612 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) 613 { 614 struct snd_pcm_plugin *plugin, *next; 615 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 616 snd_pcm_sframes_t frames = size; 617 int err; 618 619 frames = snd_pcm_plug_slave_size(plug, frames); 620 if (frames < 0) 621 return frames; 622 623 src_channels = NULL; 624 plugin = snd_pcm_plug_first(plug); 625 while (plugin && frames > 0) { 626 if ((next = plugin->next) != NULL) { 627 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) { 628 return err; 629 } 630 frames = err; 631 } else { 632 dst_channels = dst_channels_final; 633 } 634 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 635 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 636 return frames; 637 plugin = next; 638 src_channels = dst_channels; 639 } 640 return frames; 641 } 642 643 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 644 size_t samples, int format) 645 { 646 /* FIXME: sub byte resolution and odd dst_offset */ 647 unsigned char *dst; 648 unsigned int dst_step; 649 int width; 650 const unsigned char *silence; 651 if (!dst_area->addr) 652 return 0; 653 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 654 width = snd_pcm_format_physical_width(format); 655 if (width <= 0) 656 return -EINVAL; 657 if (dst_area->step == (unsigned int) width && width >= 8) 658 return snd_pcm_format_set_silence(format, dst, samples); 659 silence = snd_pcm_format_silence_64(format); 660 if (! silence) 661 return -EINVAL; 662 dst_step = dst_area->step / 8; 663 if (width == 4) { 664 /* Ima ADPCM */ 665 int dstbit = dst_area->first % 8; 666 int dstbit_step = dst_area->step % 8; 667 while (samples-- > 0) { 668 if (dstbit) 669 *dst &= 0xf0; 670 else 671 *dst &= 0x0f; 672 dst += dst_step; 673 dstbit += dstbit_step; 674 if (dstbit == 8) { 675 dst++; 676 dstbit = 0; 677 } 678 } 679 } else { 680 width /= 8; 681 while (samples-- > 0) { 682 memcpy(dst, silence, width); 683 dst += dst_step; 684 } 685 } 686 return 0; 687 } 688 689 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 690 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 691 size_t samples, int format) 692 { 693 /* FIXME: sub byte resolution and odd dst_offset */ 694 char *src, *dst; 695 int width; 696 int src_step, dst_step; 697 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 698 if (!src_area->addr) 699 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 700 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 701 if (!dst_area->addr) 702 return 0; 703 width = snd_pcm_format_physical_width(format); 704 if (width <= 0) 705 return -EINVAL; 706 if (src_area->step == (unsigned int) width && 707 dst_area->step == (unsigned int) width && width >= 8) { 708 size_t bytes = samples * width / 8; 709 memcpy(dst, src, bytes); 710 return 0; 711 } 712 src_step = src_area->step / 8; 713 dst_step = dst_area->step / 8; 714 if (width == 4) { 715 /* Ima ADPCM */ 716 int srcbit = src_area->first % 8; 717 int srcbit_step = src_area->step % 8; 718 int dstbit = dst_area->first % 8; 719 int dstbit_step = dst_area->step % 8; 720 while (samples-- > 0) { 721 unsigned char srcval; 722 if (srcbit) 723 srcval = *src & 0x0f; 724 else 725 srcval = (*src & 0xf0) >> 4; 726 if (dstbit) 727 *dst = (*dst & 0xf0) | srcval; 728 else 729 *dst = (*dst & 0x0f) | (srcval << 4); 730 src += src_step; 731 srcbit += srcbit_step; 732 if (srcbit == 8) { 733 src++; 734 srcbit = 0; 735 } 736 dst += dst_step; 737 dstbit += dstbit_step; 738 if (dstbit == 8) { 739 dst++; 740 dstbit = 0; 741 } 742 } 743 } else { 744 width /= 8; 745 while (samples-- > 0) { 746 memcpy(dst, src, width); 747 src += src_step; 748 dst += dst_step; 749 } 750 } 751 return 0; 752 } 753