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 width = snd_pcm_format_physical_width(format->format); 63 if (width < 0) 64 return width; 65 size = frames * format->channels * width; 66 if (snd_BUG_ON(size % 8)) 67 return -ENXIO; 68 size /= 8; 69 if (plugin->buf_frames < frames) { 70 kvfree(plugin->buf); 71 plugin->buf = kvzalloc(size, GFP_KERNEL); 72 plugin->buf_frames = frames; 73 } 74 if (!plugin->buf) { 75 plugin->buf_frames = 0; 76 return -ENOMEM; 77 } 78 c = plugin->buf_channels; 79 if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { 80 for (channel = 0; channel < format->channels; channel++, c++) { 81 c->frames = frames; 82 c->enabled = 1; 83 c->wanted = 0; 84 c->area.addr = plugin->buf; 85 c->area.first = channel * width; 86 c->area.step = format->channels * width; 87 } 88 } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) { 89 if (snd_BUG_ON(size % format->channels)) 90 return -EINVAL; 91 size /= format->channels; 92 for (channel = 0; channel < format->channels; channel++, c++) { 93 c->frames = frames; 94 c->enabled = 1; 95 c->wanted = 0; 96 c->area.addr = plugin->buf + (channel * size); 97 c->area.first = 0; 98 c->area.step = width; 99 } 100 } else 101 return -EINVAL; 102 return 0; 103 } 104 105 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames) 106 { 107 int err; 108 if (snd_BUG_ON(!snd_pcm_plug_first(plug))) 109 return -ENXIO; 110 if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { 111 struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug); 112 while (plugin->next) { 113 if (plugin->dst_frames) 114 frames = plugin->dst_frames(plugin, frames); 115 if ((snd_pcm_sframes_t)frames <= 0) 116 return -ENXIO; 117 plugin = plugin->next; 118 err = snd_pcm_plugin_alloc(plugin, frames); 119 if (err < 0) 120 return err; 121 } 122 } else { 123 struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug); 124 while (plugin->prev) { 125 if (plugin->src_frames) 126 frames = plugin->src_frames(plugin, frames); 127 if ((snd_pcm_sframes_t)frames <= 0) 128 return -ENXIO; 129 plugin = plugin->prev; 130 err = snd_pcm_plugin_alloc(plugin, frames); 131 if (err < 0) 132 return err; 133 } 134 } 135 return 0; 136 } 137 138 139 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, 140 snd_pcm_uframes_t frames, 141 struct snd_pcm_plugin_channel **channels) 142 { 143 *channels = plugin->buf_channels; 144 return frames; 145 } 146 147 int snd_pcm_plugin_build(struct snd_pcm_substream *plug, 148 const char *name, 149 struct snd_pcm_plugin_format *src_format, 150 struct snd_pcm_plugin_format *dst_format, 151 size_t extra, 152 struct snd_pcm_plugin **ret) 153 { 154 struct snd_pcm_plugin *plugin; 155 unsigned int channels; 156 157 if (snd_BUG_ON(!plug)) 158 return -ENXIO; 159 if (snd_BUG_ON(!src_format || !dst_format)) 160 return -ENXIO; 161 plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL); 162 if (plugin == NULL) 163 return -ENOMEM; 164 plugin->name = name; 165 plugin->plug = plug; 166 plugin->stream = snd_pcm_plug_stream(plug); 167 plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 168 plugin->src_format = *src_format; 169 plugin->src_width = snd_pcm_format_physical_width(src_format->format); 170 snd_BUG_ON(plugin->src_width <= 0); 171 plugin->dst_format = *dst_format; 172 plugin->dst_width = snd_pcm_format_physical_width(dst_format->format); 173 snd_BUG_ON(plugin->dst_width <= 0); 174 if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) 175 channels = src_format->channels; 176 else 177 channels = dst_format->channels; 178 plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL); 179 if (plugin->buf_channels == NULL) { 180 snd_pcm_plugin_free(plugin); 181 return -ENOMEM; 182 } 183 plugin->client_channels = snd_pcm_plugin_client_channels; 184 *ret = plugin; 185 return 0; 186 } 187 188 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin) 189 { 190 if (! plugin) 191 return 0; 192 if (plugin->private_free) 193 plugin->private_free(plugin); 194 kfree(plugin->buf_channels); 195 kvfree(plugin->buf); 196 kfree(plugin); 197 return 0; 198 } 199 200 static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug, 201 snd_pcm_sframes_t frames, 202 bool check_size) 203 { 204 struct snd_pcm_plugin *plugin, *plugin_next; 205 206 plugin = snd_pcm_plug_first(plug); 207 while (plugin && frames > 0) { 208 plugin_next = plugin->next; 209 if (check_size && plugin->buf_frames && 210 frames > plugin->buf_frames) 211 frames = plugin->buf_frames; 212 if (plugin->dst_frames) { 213 frames = plugin->dst_frames(plugin, frames); 214 if (frames < 0) 215 return frames; 216 } 217 plugin = plugin_next; 218 } 219 return frames; 220 } 221 222 static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug, 223 snd_pcm_sframes_t frames, 224 bool check_size) 225 { 226 struct snd_pcm_plugin *plugin, *plugin_prev; 227 228 plugin = snd_pcm_plug_last(plug); 229 while (plugin && frames > 0) { 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 if (check_size && plugin->buf_frames && 237 frames > plugin->buf_frames) 238 frames = plugin->buf_frames; 239 plugin = plugin_prev; 240 } 241 return frames; 242 } 243 244 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames) 245 { 246 if (snd_BUG_ON(!plug)) 247 return -ENXIO; 248 switch (snd_pcm_plug_stream(plug)) { 249 case SNDRV_PCM_STREAM_PLAYBACK: 250 return calc_src_frames(plug, drv_frames, false); 251 case SNDRV_PCM_STREAM_CAPTURE: 252 return calc_dst_frames(plug, drv_frames, false); 253 default: 254 snd_BUG(); 255 return -EINVAL; 256 } 257 } 258 259 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) 260 { 261 if (snd_BUG_ON(!plug)) 262 return -ENXIO; 263 switch (snd_pcm_plug_stream(plug)) { 264 case SNDRV_PCM_STREAM_PLAYBACK: 265 return calc_dst_frames(plug, clt_frames, false); 266 case SNDRV_PCM_STREAM_CAPTURE: 267 return calc_src_frames(plug, clt_frames, false); 268 default: 269 snd_BUG(); 270 return -EINVAL; 271 } 272 } 273 274 static int snd_pcm_plug_formats(const struct snd_mask *mask, 275 snd_pcm_format_t format) 276 { 277 struct snd_mask formats = *mask; 278 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | 279 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | 280 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | 281 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | 282 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | 283 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | 284 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | 285 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | 286 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); 287 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); 288 289 if (formats.bits[0] & lower_32_bits(linfmts)) 290 formats.bits[0] |= lower_32_bits(linfmts); 291 if (formats.bits[1] & upper_32_bits(linfmts)) 292 formats.bits[1] |= upper_32_bits(linfmts); 293 return snd_mask_test(&formats, (__force int)format); 294 } 295 296 static const snd_pcm_format_t preferred_formats[] = { 297 SNDRV_PCM_FORMAT_S16_LE, 298 SNDRV_PCM_FORMAT_S16_BE, 299 SNDRV_PCM_FORMAT_U16_LE, 300 SNDRV_PCM_FORMAT_U16_BE, 301 SNDRV_PCM_FORMAT_S24_3LE, 302 SNDRV_PCM_FORMAT_S24_3BE, 303 SNDRV_PCM_FORMAT_U24_3LE, 304 SNDRV_PCM_FORMAT_U24_3BE, 305 SNDRV_PCM_FORMAT_S24_LE, 306 SNDRV_PCM_FORMAT_S24_BE, 307 SNDRV_PCM_FORMAT_U24_LE, 308 SNDRV_PCM_FORMAT_U24_BE, 309 SNDRV_PCM_FORMAT_S32_LE, 310 SNDRV_PCM_FORMAT_S32_BE, 311 SNDRV_PCM_FORMAT_U32_LE, 312 SNDRV_PCM_FORMAT_U32_BE, 313 SNDRV_PCM_FORMAT_S8, 314 SNDRV_PCM_FORMAT_U8 315 }; 316 317 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, 318 const struct snd_mask *format_mask) 319 { 320 int i; 321 322 if (snd_mask_test(format_mask, (__force int)format)) 323 return format; 324 if (!snd_pcm_plug_formats(format_mask, format)) 325 return (__force snd_pcm_format_t)-EINVAL; 326 if (snd_pcm_format_linear(format)) { 327 unsigned int width = snd_pcm_format_width(format); 328 int unsignd = snd_pcm_format_unsigned(format) > 0; 329 int big = snd_pcm_format_big_endian(format) > 0; 330 unsigned int badness, best = -1; 331 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; 332 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { 333 snd_pcm_format_t f = preferred_formats[i]; 334 unsigned int w; 335 if (!snd_mask_test(format_mask, (__force int)f)) 336 continue; 337 w = snd_pcm_format_width(f); 338 if (w >= width) 339 badness = w - width; 340 else 341 badness = width - w + 32; 342 badness += snd_pcm_format_unsigned(f) != unsignd; 343 badness += snd_pcm_format_big_endian(f) != big; 344 if (badness < best) { 345 best_format = f; 346 best = badness; 347 } 348 } 349 if ((__force int)best_format >= 0) 350 return best_format; 351 else 352 return (__force snd_pcm_format_t)-EINVAL; 353 } else { 354 switch (format) { 355 case SNDRV_PCM_FORMAT_MU_LAW: 356 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { 357 snd_pcm_format_t format1 = preferred_formats[i]; 358 if (snd_mask_test(format_mask, (__force int)format1)) 359 return format1; 360 } 361 fallthrough; 362 default: 363 return (__force snd_pcm_format_t)-EINVAL; 364 } 365 } 366 } 367 368 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 369 struct snd_pcm_hw_params *params, 370 struct snd_pcm_hw_params *slave_params) 371 { 372 struct snd_pcm_plugin_format tmpformat; 373 struct snd_pcm_plugin_format dstformat; 374 struct snd_pcm_plugin_format srcformat; 375 snd_pcm_access_t src_access, dst_access; 376 struct snd_pcm_plugin *plugin = NULL; 377 int err; 378 int stream = snd_pcm_plug_stream(plug); 379 int slave_interleaved = (params_channels(slave_params) == 1 || 380 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 381 382 switch (stream) { 383 case SNDRV_PCM_STREAM_PLAYBACK: 384 dstformat.format = params_format(slave_params); 385 dstformat.rate = params_rate(slave_params); 386 dstformat.channels = params_channels(slave_params); 387 srcformat.format = params_format(params); 388 srcformat.rate = params_rate(params); 389 srcformat.channels = params_channels(params); 390 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 391 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 392 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 393 break; 394 case SNDRV_PCM_STREAM_CAPTURE: 395 dstformat.format = params_format(params); 396 dstformat.rate = params_rate(params); 397 dstformat.channels = params_channels(params); 398 srcformat.format = params_format(slave_params); 399 srcformat.rate = params_rate(slave_params); 400 srcformat.channels = params_channels(slave_params); 401 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 402 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 403 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 404 break; 405 default: 406 snd_BUG(); 407 return -EINVAL; 408 } 409 tmpformat = srcformat; 410 411 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 412 srcformat.format, 413 srcformat.rate, 414 srcformat.channels); 415 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 416 dstformat.format, 417 dstformat.rate, 418 dstformat.channels); 419 420 /* Format change (linearization) */ 421 if (! rate_match(srcformat.rate, dstformat.rate) && 422 ! snd_pcm_format_linear(srcformat.format)) { 423 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 424 return -EINVAL; 425 tmpformat.format = SNDRV_PCM_FORMAT_S16; 426 err = snd_pcm_plugin_build_mulaw(plug, 427 &srcformat, &tmpformat, 428 &plugin); 429 if (err < 0) 430 return err; 431 err = snd_pcm_plugin_append(plugin); 432 if (err < 0) { 433 snd_pcm_plugin_free(plugin); 434 return err; 435 } 436 srcformat = tmpformat; 437 src_access = dst_access; 438 } 439 440 /* channels reduction */ 441 if (srcformat.channels > dstformat.channels) { 442 tmpformat.channels = dstformat.channels; 443 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 444 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 445 if (err < 0) 446 return err; 447 err = snd_pcm_plugin_append(plugin); 448 if (err < 0) { 449 snd_pcm_plugin_free(plugin); 450 return err; 451 } 452 srcformat = tmpformat; 453 src_access = dst_access; 454 } 455 456 /* rate resampling */ 457 if (!rate_match(srcformat.rate, dstformat.rate)) { 458 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 459 /* convert to S16 for resampling */ 460 tmpformat.format = SNDRV_PCM_FORMAT_S16; 461 err = snd_pcm_plugin_build_linear(plug, 462 &srcformat, &tmpformat, 463 &plugin); 464 if (err < 0) 465 return err; 466 err = snd_pcm_plugin_append(plugin); 467 if (err < 0) { 468 snd_pcm_plugin_free(plugin); 469 return err; 470 } 471 srcformat = tmpformat; 472 src_access = dst_access; 473 } 474 tmpformat.rate = dstformat.rate; 475 err = snd_pcm_plugin_build_rate(plug, 476 &srcformat, &tmpformat, 477 &plugin); 478 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 479 if (err < 0) 480 return err; 481 err = snd_pcm_plugin_append(plugin); 482 if (err < 0) { 483 snd_pcm_plugin_free(plugin); 484 return err; 485 } 486 srcformat = tmpformat; 487 src_access = dst_access; 488 } 489 490 /* format change */ 491 if (srcformat.format != dstformat.format) { 492 tmpformat.format = dstformat.format; 493 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 494 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 495 err = snd_pcm_plugin_build_mulaw(plug, 496 &srcformat, &tmpformat, 497 &plugin); 498 } 499 else if (snd_pcm_format_linear(srcformat.format) && 500 snd_pcm_format_linear(tmpformat.format)) { 501 err = snd_pcm_plugin_build_linear(plug, 502 &srcformat, &tmpformat, 503 &plugin); 504 } 505 else 506 return -EINVAL; 507 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 508 if (err < 0) 509 return err; 510 err = snd_pcm_plugin_append(plugin); 511 if (err < 0) { 512 snd_pcm_plugin_free(plugin); 513 return err; 514 } 515 srcformat = tmpformat; 516 src_access = dst_access; 517 } 518 519 /* channels extension */ 520 if (srcformat.channels < dstformat.channels) { 521 tmpformat.channels = dstformat.channels; 522 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 523 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 524 if (err < 0) 525 return err; 526 err = snd_pcm_plugin_append(plugin); 527 if (err < 0) { 528 snd_pcm_plugin_free(plugin); 529 return err; 530 } 531 srcformat = tmpformat; 532 src_access = dst_access; 533 } 534 535 /* de-interleave */ 536 if (src_access != dst_access) { 537 err = snd_pcm_plugin_build_copy(plug, 538 &srcformat, 539 &tmpformat, 540 &plugin); 541 pdprintf("interleave change (copy: returns %i)\n", err); 542 if (err < 0) 543 return err; 544 err = snd_pcm_plugin_append(plugin); 545 if (err < 0) { 546 snd_pcm_plugin_free(plugin); 547 return err; 548 } 549 } 550 551 return 0; 552 } 553 554 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 555 char *buf, 556 snd_pcm_uframes_t count, 557 struct snd_pcm_plugin_channel **channels) 558 { 559 struct snd_pcm_plugin *plugin; 560 struct snd_pcm_plugin_channel *v; 561 struct snd_pcm_plugin_format *format; 562 int width, nchannels, channel; 563 int stream = snd_pcm_plug_stream(plug); 564 565 if (snd_BUG_ON(!buf)) 566 return -ENXIO; 567 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 568 plugin = snd_pcm_plug_first(plug); 569 format = &plugin->src_format; 570 } else { 571 plugin = snd_pcm_plug_last(plug); 572 format = &plugin->dst_format; 573 } 574 v = plugin->buf_channels; 575 *channels = v; 576 width = snd_pcm_format_physical_width(format->format); 577 if (width < 0) 578 return width; 579 nchannels = format->channels; 580 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 581 format->channels > 1)) 582 return -ENXIO; 583 for (channel = 0; channel < nchannels; channel++, v++) { 584 v->frames = count; 585 v->enabled = 1; 586 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 587 v->area.addr = buf; 588 v->area.first = channel * width; 589 v->area.step = nchannels * width; 590 } 591 return count; 592 } 593 594 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) 595 { 596 struct snd_pcm_plugin *plugin, *next; 597 struct snd_pcm_plugin_channel *dst_channels; 598 int err; 599 snd_pcm_sframes_t frames = size; 600 601 plugin = snd_pcm_plug_first(plug); 602 while (plugin) { 603 if (frames <= 0) 604 return frames; 605 next = plugin->next; 606 if (next) { 607 snd_pcm_sframes_t frames1 = frames; 608 if (plugin->dst_frames) { 609 frames1 = plugin->dst_frames(plugin, frames); 610 if (frames1 <= 0) 611 return frames1; 612 } 613 err = next->client_channels(next, frames1, &dst_channels); 614 if (err < 0) 615 return err; 616 if (err != frames1) { 617 frames = err; 618 if (plugin->src_frames) { 619 frames = plugin->src_frames(plugin, frames1); 620 if (frames <= 0) 621 return frames; 622 } 623 } 624 } else 625 dst_channels = NULL; 626 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 627 frames = plugin->transfer(plugin, src_channels, dst_channels, frames); 628 if (frames < 0) 629 return frames; 630 src_channels = dst_channels; 631 plugin = next; 632 } 633 return calc_src_frames(plug, frames, true); 634 } 635 636 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size) 637 { 638 struct snd_pcm_plugin *plugin, *next; 639 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 640 snd_pcm_sframes_t frames = size; 641 int err; 642 643 frames = calc_src_frames(plug, frames, true); 644 if (frames < 0) 645 return frames; 646 647 src_channels = NULL; 648 plugin = snd_pcm_plug_first(plug); 649 while (plugin && frames > 0) { 650 next = plugin->next; 651 if (next) { 652 err = plugin->client_channels(plugin, frames, &dst_channels); 653 if (err < 0) 654 return err; 655 frames = err; 656 } else { 657 dst_channels = dst_channels_final; 658 } 659 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 660 frames = plugin->transfer(plugin, src_channels, dst_channels, frames); 661 if (frames < 0) 662 return frames; 663 plugin = next; 664 src_channels = dst_channels; 665 } 666 return frames; 667 } 668 669 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 670 size_t samples, snd_pcm_format_t format) 671 { 672 /* FIXME: sub byte resolution and odd dst_offset */ 673 unsigned char *dst; 674 unsigned int dst_step; 675 int width; 676 const unsigned char *silence; 677 if (!dst_area->addr) 678 return 0; 679 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 680 width = snd_pcm_format_physical_width(format); 681 if (width <= 0) 682 return -EINVAL; 683 if (dst_area->step == (unsigned int) width && width >= 8) 684 return snd_pcm_format_set_silence(format, dst, samples); 685 silence = snd_pcm_format_silence_64(format); 686 if (! silence) 687 return -EINVAL; 688 dst_step = dst_area->step / 8; 689 if (width == 4) { 690 /* Ima ADPCM */ 691 int dstbit = dst_area->first % 8; 692 int dstbit_step = dst_area->step % 8; 693 while (samples-- > 0) { 694 if (dstbit) 695 *dst &= 0xf0; 696 else 697 *dst &= 0x0f; 698 dst += dst_step; 699 dstbit += dstbit_step; 700 if (dstbit == 8) { 701 dst++; 702 dstbit = 0; 703 } 704 } 705 } else { 706 width /= 8; 707 while (samples-- > 0) { 708 memcpy(dst, silence, width); 709 dst += dst_step; 710 } 711 } 712 return 0; 713 } 714 715 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 716 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 717 size_t samples, snd_pcm_format_t format) 718 { 719 /* FIXME: sub byte resolution and odd dst_offset */ 720 char *src, *dst; 721 int width; 722 int src_step, dst_step; 723 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 724 if (!src_area->addr) 725 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 726 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 727 if (!dst_area->addr) 728 return 0; 729 width = snd_pcm_format_physical_width(format); 730 if (width <= 0) 731 return -EINVAL; 732 if (src_area->step == (unsigned int) width && 733 dst_area->step == (unsigned int) width && width >= 8) { 734 size_t bytes = samples * width / 8; 735 memcpy(dst, src, bytes); 736 return 0; 737 } 738 src_step = src_area->step / 8; 739 dst_step = dst_area->step / 8; 740 if (width == 4) { 741 /* Ima ADPCM */ 742 int srcbit = src_area->first % 8; 743 int srcbit_step = src_area->step % 8; 744 int dstbit = dst_area->first % 8; 745 int dstbit_step = dst_area->step % 8; 746 while (samples-- > 0) { 747 unsigned char srcval; 748 if (srcbit) 749 srcval = *src & 0x0f; 750 else 751 srcval = (*src & 0xf0) >> 4; 752 if (dstbit) 753 *dst = (*dst & 0xf0) | srcval; 754 else 755 *dst = (*dst & 0x0f) | (srcval << 4); 756 src += src_step; 757 srcbit += srcbit_step; 758 if (srcbit == 8) { 759 src++; 760 srcbit = 0; 761 } 762 dst += dst_step; 763 dstbit += dstbit_step; 764 if (dstbit == 8) { 765 dst++; 766 dstbit = 0; 767 } 768 } 769 } else { 770 width /= 8; 771 while (samples-- > 0) { 772 memcpy(dst, src, width); 773 src += src_step; 774 dst += dst_step; 775 } 776 } 777 return 0; 778 } 779