1 /* 2 * PCM Plug-In shared (kernel/library) code 3 * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> 4 * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org> 5 * 6 * 7 * This library is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU Library General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public 18 * License along with this library; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23 #if 0 24 #define PLUGIN_DEBUG 25 #endif 26 27 #include <linux/slab.h> 28 #include <linux/time.h> 29 #include <linux/vmalloc.h> 30 #include <sound/core.h> 31 #include <sound/pcm.h> 32 #include <sound/pcm_params.h> 33 #include "pcm_plugin.h" 34 35 #define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first) 36 #define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last) 37 38 /* 39 * because some cards might have rates "very close", we ignore 40 * all "resampling" requests within +-5% 41 */ 42 static int rate_match(unsigned int src_rate, unsigned int dst_rate) 43 { 44 unsigned int low = (src_rate * 95) / 100; 45 unsigned int high = (src_rate * 105) / 100; 46 return dst_rate >= low && dst_rate <= high; 47 } 48 49 static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames) 50 { 51 struct snd_pcm_plugin_format *format; 52 ssize_t width; 53 size_t size; 54 unsigned int channel; 55 struct snd_pcm_plugin_channel *c; 56 57 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) { 58 format = &plugin->src_format; 59 } else { 60 format = &plugin->dst_format; 61 } 62 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 63 return width; 64 size = frames * format->channels * width; 65 if (snd_BUG_ON(size % 8)) 66 return -ENXIO; 67 size /= 8; 68 if (plugin->buf_frames < frames) { 69 kvfree(plugin->buf); 70 plugin->buf = kvzalloc(size, GFP_KERNEL); 71 plugin->buf_frames = frames; 72 } 73 if (!plugin->buf) { 74 plugin->buf_frames = 0; 75 return -ENOMEM; 76 } 77 c = plugin->buf_channels; 78 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { 79 for (channel = 0; channel < format->channels; channel++, c++) { 80 c->frames = frames; 81 c->enabled = 1; 82 c->wanted = 0; 83 c->area.addr = plugin->buf; 84 c->area.first = channel * width; 85 c->area.step = format->channels * width; 86 } 87 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) { 88 if (snd_BUG_ON(size % format->channels)) 89 return -EINVAL; 90 size /= format->channels; 91 for (channel = 0; channel < format->channels; channel++, c++) { 92 c->frames = frames; 93 c->enabled = 1; 94 c->wanted = 0; 95 c->area.addr = plugin->buf + (channel * size); 96 c->area.first = 0; 97 c->area.step = width; 98 } 99 } else 100 return -EINVAL; 101 return 0; 102 } 103 104 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames) 105 { 106 int err; 107 if (snd_BUG_ON(!snd_pcm_plug_first(plug))) 108 return -ENXIO; 109 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { 110 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug); 111 while (plugin->next) { 112 if (plugin->dst_frames) 113 frames = plugin->dst_frames(plugin, frames); 114 if ((snd_pcm_sframes_t)frames <= 0) 115 return -ENXIO; 116 plugin = plugin->next; 117 err = snd_pcm_plugin_alloc(plugin, frames); 118 if (err < 0) 119 return err; 120 } 121 } else { 122 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug); 123 while (plugin->prev) { 124 if (plugin->src_frames) 125 frames = plugin->src_frames(plugin, frames); 126 if ((snd_pcm_sframes_t)frames <= 0) 127 return -ENXIO; 128 plugin = plugin->prev; 129 err = snd_pcm_plugin_alloc(plugin, frames); 130 if (err < 0) 131 return err; 132 } 133 } 134 return 0; 135 } 136 137 138 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, 139 snd_pcm_uframes_t frames, 140 struct snd_pcm_plugin_channel **channels) 141 { 142 *channels = plugin->buf_channels; 143 return frames; 144 } 145 146 int snd_pcm_plugin_build(struct snd_pcm_substream *plug, 147 const char *name, 148 struct snd_pcm_plugin_format *src_format, 149 struct snd_pcm_plugin_format *dst_format, 150 size_t extra, 151 struct snd_pcm_plugin **ret) 152 { 153 struct snd_pcm_plugin *plugin; 154 unsigned int channels; 155 156 if (snd_BUG_ON(!plug)) 157 return -ENXIO; 158 if (snd_BUG_ON(!src_format || !dst_format)) 159 return -ENXIO; 160 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL); 161 if (plugin == NULL) 162 return -ENOMEM; 163 plugin->name = name; 164 plugin->plug = plug; 165 plugin->stream = snd_pcm_plug_stream(plug); 166 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 167 plugin->src_format = *src_format; 168 plugin->src_width = snd_pcm_format_physical_width(src_format->format); 169 snd_BUG_ON(plugin->src_width <= 0); 170 plugin->dst_format = *dst_format; 171 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format); 172 snd_BUG_ON(plugin->dst_width <= 0); 173 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) 174 channels = src_format->channels; 175 else 176 channels = dst_format->channels; 177 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL); 178 if (plugin->buf_channels == NULL) { 179 snd_pcm_plugin_free(plugin); 180 return -ENOMEM; 181 } 182 plugin->client_channels = snd_pcm_plugin_client_channels; 183 *ret = plugin; 184 return 0; 185 } 186 187 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin) 188 { 189 if (! plugin) 190 return 0; 191 if (plugin->private_free) 192 plugin->private_free(plugin); 193 kfree(plugin->buf_channels); 194 kvfree(plugin->buf); 195 kfree(plugin); 196 return 0; 197 } 198 199 static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug, 200 snd_pcm_sframes_t frames, 201 bool check_size) 202 { 203 struct snd_pcm_plugin *plugin, *plugin_next; 204 205 plugin = snd_pcm_plug_first(plug); 206 while (plugin && frames > 0) { 207 plugin_next = plugin->next; 208 if (plugin->dst_frames) { 209 frames = plugin->dst_frames(plugin, frames); 210 if (frames < 0) 211 return frames; 212 } 213 if (check_size && frames > plugin->buf_frames) 214 frames = plugin->buf_frames; 215 plugin = plugin_next; 216 } 217 return frames; 218 } 219 220 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug, 221 snd_pcm_sframes_t frames, 222 bool check_size) 223 { 224 struct snd_pcm_plugin *plugin, *plugin_prev; 225 226 plugin = snd_pcm_plug_last(plug); 227 while (plugin && frames > 0) { 228 if (check_size && frames > plugin->buf_frames) 229 frames = plugin->buf_frames; 230 plugin_prev = plugin->prev; 231 if (plugin->src_frames) { 232 frames = plugin->src_frames(plugin, frames); 233 if (frames < 0) 234 return frames; 235 } 236 plugin = plugin_prev; 237 } 238 return frames; 239 } 240 241 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames) 242 { 243 if (snd_BUG_ON(!plug)) 244 return -ENXIO; 245 switch (snd_pcm_plug_stream(plug)) { 246 case SNDRV_PCM_STREAM_PLAYBACK: 247 return calc_src_frames(plug, drv_frames, false); 248 case SNDRV_PCM_STREAM_CAPTURE: 249 return calc_dst_frames(plug, drv_frames, false); 250 default: 251 snd_BUG(); 252 return -EINVAL; 253 } 254 } 255 256 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) 257 { 258 if (snd_BUG_ON(!plug)) 259 return -ENXIO; 260 switch (snd_pcm_plug_stream(plug)) { 261 case SNDRV_PCM_STREAM_PLAYBACK: 262 return calc_dst_frames(plug, clt_frames, false); 263 case SNDRV_PCM_STREAM_CAPTURE: 264 return calc_src_frames(plug, clt_frames, false); 265 default: 266 snd_BUG(); 267 return -EINVAL; 268 } 269 } 270 271 static int snd_pcm_plug_formats(const struct snd_mask *mask, 272 snd_pcm_format_t format) 273 { 274 struct snd_mask formats = *mask; 275 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | 276 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | 277 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | 278 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | 279 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | 280 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | 281 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | 282 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | 283 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); 284 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); 285 286 if (formats.bits[0] & lower_32_bits(linfmts)) 287 formats.bits[0] |= lower_32_bits(linfmts); 288 if (formats.bits[1] & upper_32_bits(linfmts)) 289 formats.bits[1] |= upper_32_bits(linfmts); 290 return snd_mask_test(&formats, (__force int)format); 291 } 292 293 static const snd_pcm_format_t preferred_formats[] = { 294 SNDRV_PCM_FORMAT_S16_LE, 295 SNDRV_PCM_FORMAT_S16_BE, 296 SNDRV_PCM_FORMAT_U16_LE, 297 SNDRV_PCM_FORMAT_U16_BE, 298 SNDRV_PCM_FORMAT_S24_3LE, 299 SNDRV_PCM_FORMAT_S24_3BE, 300 SNDRV_PCM_FORMAT_U24_3LE, 301 SNDRV_PCM_FORMAT_U24_3BE, 302 SNDRV_PCM_FORMAT_S24_LE, 303 SNDRV_PCM_FORMAT_S24_BE, 304 SNDRV_PCM_FORMAT_U24_LE, 305 SNDRV_PCM_FORMAT_U24_BE, 306 SNDRV_PCM_FORMAT_S32_LE, 307 SNDRV_PCM_FORMAT_S32_BE, 308 SNDRV_PCM_FORMAT_U32_LE, 309 SNDRV_PCM_FORMAT_U32_BE, 310 SNDRV_PCM_FORMAT_S8, 311 SNDRV_PCM_FORMAT_U8 312 }; 313 314 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, 315 const struct snd_mask *format_mask) 316 { 317 int i; 318 319 if (snd_mask_test(format_mask, (__force int)format)) 320 return format; 321 if (!snd_pcm_plug_formats(format_mask, format)) 322 return (__force snd_pcm_format_t)-EINVAL; 323 if (snd_pcm_format_linear(format)) { 324 unsigned int width = snd_pcm_format_width(format); 325 int unsignd = snd_pcm_format_unsigned(format) > 0; 326 int big = snd_pcm_format_big_endian(format) > 0; 327 unsigned int badness, best = -1; 328 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; 329 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { 330 snd_pcm_format_t f = preferred_formats[i]; 331 unsigned int w; 332 if (!snd_mask_test(format_mask, (__force int)f)) 333 continue; 334 w = snd_pcm_format_width(f); 335 if (w >= width) 336 badness = w - width; 337 else 338 badness = width - w + 32; 339 badness += snd_pcm_format_unsigned(f) != unsignd; 340 badness += snd_pcm_format_big_endian(f) != big; 341 if (badness < best) { 342 best_format = f; 343 best = badness; 344 } 345 } 346 if ((__force int)best_format >= 0) 347 return best_format; 348 else 349 return (__force snd_pcm_format_t)-EINVAL; 350 } else { 351 switch (format) { 352 case SNDRV_PCM_FORMAT_MU_LAW: 353 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { 354 snd_pcm_format_t format1 = preferred_formats[i]; 355 if (snd_mask_test(format_mask, (__force int)format1)) 356 return format1; 357 } 358 /* fall through */ 359 default: 360 return (__force snd_pcm_format_t)-EINVAL; 361 } 362 } 363 } 364 365 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 366 struct snd_pcm_hw_params *params, 367 struct snd_pcm_hw_params *slave_params) 368 { 369 struct snd_pcm_plugin_format tmpformat; 370 struct snd_pcm_plugin_format dstformat; 371 struct snd_pcm_plugin_format srcformat; 372 snd_pcm_access_t src_access, dst_access; 373 struct snd_pcm_plugin *plugin = NULL; 374 int err; 375 int stream = snd_pcm_plug_stream(plug); 376 int slave_interleaved = (params_channels(slave_params) == 1 || 377 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 378 379 switch (stream) { 380 case SNDRV_PCM_STREAM_PLAYBACK: 381 dstformat.format = params_format(slave_params); 382 dstformat.rate = params_rate(slave_params); 383 dstformat.channels = params_channels(slave_params); 384 srcformat.format = params_format(params); 385 srcformat.rate = params_rate(params); 386 srcformat.channels = params_channels(params); 387 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 388 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 389 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 390 break; 391 case SNDRV_PCM_STREAM_CAPTURE: 392 dstformat.format = params_format(params); 393 dstformat.rate = params_rate(params); 394 dstformat.channels = params_channels(params); 395 srcformat.format = params_format(slave_params); 396 srcformat.rate = params_rate(slave_params); 397 srcformat.channels = params_channels(slave_params); 398 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 399 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 400 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 401 break; 402 default: 403 snd_BUG(); 404 return -EINVAL; 405 } 406 tmpformat = srcformat; 407 408 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 409 srcformat.format, 410 srcformat.rate, 411 srcformat.channels); 412 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 413 dstformat.format, 414 dstformat.rate, 415 dstformat.channels); 416 417 /* Format change (linearization) */ 418 if (! rate_match(srcformat.rate, dstformat.rate) && 419 ! snd_pcm_format_linear(srcformat.format)) { 420 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 421 return -EINVAL; 422 tmpformat.format = SNDRV_PCM_FORMAT_S16; 423 err = snd_pcm_plugin_build_mulaw(plug, 424 &srcformat, &tmpformat, 425 &plugin); 426 if (err < 0) 427 return err; 428 err = snd_pcm_plugin_append(plugin); 429 if (err < 0) { 430 snd_pcm_plugin_free(plugin); 431 return err; 432 } 433 srcformat = tmpformat; 434 src_access = dst_access; 435 } 436 437 /* channels reduction */ 438 if (srcformat.channels > dstformat.channels) { 439 tmpformat.channels = dstformat.channels; 440 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 441 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 442 if (err < 0) 443 return err; 444 err = snd_pcm_plugin_append(plugin); 445 if (err < 0) { 446 snd_pcm_plugin_free(plugin); 447 return err; 448 } 449 srcformat = tmpformat; 450 src_access = dst_access; 451 } 452 453 /* rate resampling */ 454 if (!rate_match(srcformat.rate, dstformat.rate)) { 455 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 456 /* convert to S16 for resampling */ 457 tmpformat.format = SNDRV_PCM_FORMAT_S16; 458 err = snd_pcm_plugin_build_linear(plug, 459 &srcformat, &tmpformat, 460 &plugin); 461 if (err < 0) 462 return err; 463 err = snd_pcm_plugin_append(plugin); 464 if (err < 0) { 465 snd_pcm_plugin_free(plugin); 466 return err; 467 } 468 srcformat = tmpformat; 469 src_access = dst_access; 470 } 471 tmpformat.rate = dstformat.rate; 472 err = snd_pcm_plugin_build_rate(plug, 473 &srcformat, &tmpformat, 474 &plugin); 475 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 476 if (err < 0) 477 return err; 478 err = snd_pcm_plugin_append(plugin); 479 if (err < 0) { 480 snd_pcm_plugin_free(plugin); 481 return err; 482 } 483 srcformat = tmpformat; 484 src_access = dst_access; 485 } 486 487 /* format change */ 488 if (srcformat.format != dstformat.format) { 489 tmpformat.format = dstformat.format; 490 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 491 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 492 err = snd_pcm_plugin_build_mulaw(plug, 493 &srcformat, &tmpformat, 494 &plugin); 495 } 496 else if (snd_pcm_format_linear(srcformat.format) && 497 snd_pcm_format_linear(tmpformat.format)) { 498 err = snd_pcm_plugin_build_linear(plug, 499 &srcformat, &tmpformat, 500 &plugin); 501 } 502 else 503 return -EINVAL; 504 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 505 if (err < 0) 506 return err; 507 err = snd_pcm_plugin_append(plugin); 508 if (err < 0) { 509 snd_pcm_plugin_free(plugin); 510 return err; 511 } 512 srcformat = tmpformat; 513 src_access = dst_access; 514 } 515 516 /* channels extension */ 517 if (srcformat.channels < dstformat.channels) { 518 tmpformat.channels = dstformat.channels; 519 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 520 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 521 if (err < 0) 522 return err; 523 err = snd_pcm_plugin_append(plugin); 524 if (err < 0) { 525 snd_pcm_plugin_free(plugin); 526 return err; 527 } 528 srcformat = tmpformat; 529 src_access = dst_access; 530 } 531 532 /* de-interleave */ 533 if (src_access != dst_access) { 534 err = snd_pcm_plugin_build_copy(plug, 535 &srcformat, 536 &tmpformat, 537 &plugin); 538 pdprintf("interleave change (copy: returns %i)\n", err); 539 if (err < 0) 540 return err; 541 err = snd_pcm_plugin_append(plugin); 542 if (err < 0) { 543 snd_pcm_plugin_free(plugin); 544 return err; 545 } 546 } 547 548 return 0; 549 } 550 551 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 552 char *buf, 553 snd_pcm_uframes_t count, 554 struct snd_pcm_plugin_channel **channels) 555 { 556 struct snd_pcm_plugin *plugin; 557 struct snd_pcm_plugin_channel *v; 558 struct snd_pcm_plugin_format *format; 559 int width, nchannels, channel; 560 int stream = snd_pcm_plug_stream(plug); 561 562 if (snd_BUG_ON(!buf)) 563 return -ENXIO; 564 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 565 plugin = snd_pcm_plug_first(plug); 566 format = &plugin->src_format; 567 } else { 568 plugin = snd_pcm_plug_last(plug); 569 format = &plugin->dst_format; 570 } 571 v = plugin->buf_channels; 572 *channels = v; 573 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 574 return width; 575 nchannels = format->channels; 576 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 577 format->channels > 1)) 578 return -ENXIO; 579 for (channel = 0; channel < nchannels; channel++, v++) { 580 v->frames = count; 581 v->enabled = 1; 582 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 583 v->area.addr = buf; 584 v->area.first = channel * width; 585 v->area.step = nchannels * width; 586 } 587 return count; 588 } 589 590 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) 591 { 592 struct snd_pcm_plugin *plugin, *next; 593 struct snd_pcm_plugin_channel *dst_channels; 594 int err; 595 snd_pcm_sframes_t frames = size; 596 597 plugin = snd_pcm_plug_first(plug); 598 while (plugin) { 599 if (frames <= 0) 600 return frames; 601 if ((next = plugin->next) != NULL) { 602 snd_pcm_sframes_t frames1 = frames; 603 if (plugin->dst_frames) { 604 frames1 = plugin->dst_frames(plugin, frames); 605 if (frames1 <= 0) 606 return frames1; 607 } 608 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) { 609 return err; 610 } 611 if (err != frames1) { 612 frames = err; 613 if (plugin->src_frames) { 614 frames = plugin->src_frames(plugin, frames1); 615 if (frames <= 0) 616 return frames; 617 } 618 } 619 } else 620 dst_channels = NULL; 621 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 622 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 623 return frames; 624 src_channels = dst_channels; 625 plugin = next; 626 } 627 return calc_src_frames(plug, frames, true); 628 } 629 630 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) 631 { 632 struct snd_pcm_plugin *plugin, *next; 633 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 634 snd_pcm_sframes_t frames = size; 635 int err; 636 637 frames = calc_src_frames(plug, frames, true); 638 if (frames < 0) 639 return frames; 640 641 src_channels = NULL; 642 plugin = snd_pcm_plug_first(plug); 643 while (plugin && frames > 0) { 644 if ((next = plugin->next) != NULL) { 645 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) { 646 return err; 647 } 648 frames = err; 649 } else { 650 dst_channels = dst_channels_final; 651 } 652 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 653 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 654 return frames; 655 plugin = next; 656 src_channels = dst_channels; 657 } 658 return frames; 659 } 660 661 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 662 size_t samples, snd_pcm_format_t format) 663 { 664 /* FIXME: sub byte resolution and odd dst_offset */ 665 unsigned char *dst; 666 unsigned int dst_step; 667 int width; 668 const unsigned char *silence; 669 if (!dst_area->addr) 670 return 0; 671 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 672 width = snd_pcm_format_physical_width(format); 673 if (width <= 0) 674 return -EINVAL; 675 if (dst_area->step == (unsigned int) width && width >= 8) 676 return snd_pcm_format_set_silence(format, dst, samples); 677 silence = snd_pcm_format_silence_64(format); 678 if (! silence) 679 return -EINVAL; 680 dst_step = dst_area->step / 8; 681 if (width == 4) { 682 /* Ima ADPCM */ 683 int dstbit = dst_area->first % 8; 684 int dstbit_step = dst_area->step % 8; 685 while (samples-- > 0) { 686 if (dstbit) 687 *dst &= 0xf0; 688 else 689 *dst &= 0x0f; 690 dst += dst_step; 691 dstbit += dstbit_step; 692 if (dstbit == 8) { 693 dst++; 694 dstbit = 0; 695 } 696 } 697 } else { 698 width /= 8; 699 while (samples-- > 0) { 700 memcpy(dst, silence, width); 701 dst += dst_step; 702 } 703 } 704 return 0; 705 } 706 707 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 708 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 709 size_t samples, snd_pcm_format_t format) 710 { 711 /* FIXME: sub byte resolution and odd dst_offset */ 712 char *src, *dst; 713 int width; 714 int src_step, dst_step; 715 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 716 if (!src_area->addr) 717 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 718 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 719 if (!dst_area->addr) 720 return 0; 721 width = snd_pcm_format_physical_width(format); 722 if (width <= 0) 723 return -EINVAL; 724 if (src_area->step == (unsigned int) width && 725 dst_area->step == (unsigned int) width && width >= 8) { 726 size_t bytes = samples * width / 8; 727 memcpy(dst, src, bytes); 728 return 0; 729 } 730 src_step = src_area->step / 8; 731 dst_step = dst_area->step / 8; 732 if (width == 4) { 733 /* Ima ADPCM */ 734 int srcbit = src_area->first % 8; 735 int srcbit_step = src_area->step % 8; 736 int dstbit = dst_area->first % 8; 737 int dstbit_step = dst_area->step % 8; 738 while (samples-- > 0) { 739 unsigned char srcval; 740 if (srcbit) 741 srcval = *src & 0x0f; 742 else 743 srcval = (*src & 0xf0) >> 4; 744 if (dstbit) 745 *dst = (*dst & 0xf0) | srcval; 746 else 747 *dst = (*dst & 0x0f) | (srcval << 4); 748 src += src_step; 749 srcbit += srcbit_step; 750 if (srcbit == 8) { 751 src++; 752 srcbit = 0; 753 } 754 dst += dst_step; 755 dstbit += dstbit_step; 756 if (dstbit == 8) { 757 dst++; 758 dstbit = 0; 759 } 760 } 761 } else { 762 width /= 8; 763 while (samples-- > 0) { 764 memcpy(dst, src, width); 765 src += src_step; 766 dst += dst_step; 767 } 768 } 769 return 0; 770 } 771