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