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; 203 204 if (snd_BUG_ON(!plug)) 205 return -ENXIO; 206 if (drv_frames == 0) 207 return 0; 208 stream = snd_pcm_plug_stream(plug); 209 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 210 plugin = snd_pcm_plug_last(plug); 211 while (plugin && drv_frames > 0) { 212 plugin_prev = plugin->prev; 213 if (plugin->src_frames) 214 drv_frames = plugin->src_frames(plugin, drv_frames); 215 plugin = plugin_prev; 216 } 217 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) { 218 plugin = snd_pcm_plug_first(plug); 219 while (plugin && drv_frames > 0) { 220 plugin_next = plugin->next; 221 if (plugin->dst_frames) 222 drv_frames = plugin->dst_frames(plugin, drv_frames); 223 plugin = plugin_next; 224 } 225 } else 226 snd_BUG(); 227 return drv_frames; 228 } 229 230 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) 231 { 232 struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next; 233 snd_pcm_sframes_t frames; 234 int stream; 235 236 if (snd_BUG_ON(!plug)) 237 return -ENXIO; 238 if (clt_frames == 0) 239 return 0; 240 frames = clt_frames; 241 stream = snd_pcm_plug_stream(plug); 242 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 243 plugin = snd_pcm_plug_first(plug); 244 while (plugin && frames > 0) { 245 plugin_next = plugin->next; 246 if (plugin->dst_frames) { 247 frames = plugin->dst_frames(plugin, frames); 248 if (frames < 0) 249 return frames; 250 } 251 plugin = plugin_next; 252 } 253 } else if (stream == SNDRV_PCM_STREAM_CAPTURE) { 254 plugin = snd_pcm_plug_last(plug); 255 while (plugin) { 256 plugin_prev = plugin->prev; 257 if (plugin->src_frames) { 258 frames = plugin->src_frames(plugin, frames); 259 if (frames < 0) 260 return frames; 261 } 262 plugin = plugin_prev; 263 } 264 } else 265 snd_BUG(); 266 return frames; 267 } 268 269 static int snd_pcm_plug_formats(const struct snd_mask *mask, 270 snd_pcm_format_t format) 271 { 272 struct snd_mask formats = *mask; 273 u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | 274 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | 275 SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | 276 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | 277 SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | 278 SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | 279 SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | 280 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | 281 SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); 282 snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); 283 284 if (formats.bits[0] & (u32)linfmts) 285 formats.bits[0] |= (u32)linfmts; 286 if (formats.bits[1] & (u32)(linfmts >> 32)) 287 formats.bits[1] |= (u32)(linfmts >> 32); 288 return snd_mask_test(&formats, (__force int)format); 289 } 290 291 static snd_pcm_format_t preferred_formats[] = { 292 SNDRV_PCM_FORMAT_S16_LE, 293 SNDRV_PCM_FORMAT_S16_BE, 294 SNDRV_PCM_FORMAT_U16_LE, 295 SNDRV_PCM_FORMAT_U16_BE, 296 SNDRV_PCM_FORMAT_S24_3LE, 297 SNDRV_PCM_FORMAT_S24_3BE, 298 SNDRV_PCM_FORMAT_U24_3LE, 299 SNDRV_PCM_FORMAT_U24_3BE, 300 SNDRV_PCM_FORMAT_S24_LE, 301 SNDRV_PCM_FORMAT_S24_BE, 302 SNDRV_PCM_FORMAT_U24_LE, 303 SNDRV_PCM_FORMAT_U24_BE, 304 SNDRV_PCM_FORMAT_S32_LE, 305 SNDRV_PCM_FORMAT_S32_BE, 306 SNDRV_PCM_FORMAT_U32_LE, 307 SNDRV_PCM_FORMAT_U32_BE, 308 SNDRV_PCM_FORMAT_S8, 309 SNDRV_PCM_FORMAT_U8 310 }; 311 312 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, 313 const struct snd_mask *format_mask) 314 { 315 int i; 316 317 if (snd_mask_test(format_mask, (__force int)format)) 318 return format; 319 if (!snd_pcm_plug_formats(format_mask, format)) 320 return (__force snd_pcm_format_t)-EINVAL; 321 if (snd_pcm_format_linear(format)) { 322 unsigned int width = snd_pcm_format_width(format); 323 int unsignd = snd_pcm_format_unsigned(format) > 0; 324 int big = snd_pcm_format_big_endian(format) > 0; 325 unsigned int badness, best = -1; 326 snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; 327 for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { 328 snd_pcm_format_t f = preferred_formats[i]; 329 unsigned int w; 330 if (!snd_mask_test(format_mask, (__force int)f)) 331 continue; 332 w = snd_pcm_format_width(f); 333 if (w >= width) 334 badness = w - width; 335 else 336 badness = width - w + 32; 337 badness += snd_pcm_format_unsigned(f) != unsignd; 338 badness += snd_pcm_format_big_endian(f) != big; 339 if (badness < best) { 340 best_format = f; 341 best = badness; 342 } 343 } 344 if ((__force int)best_format >= 0) 345 return best_format; 346 else 347 return (__force snd_pcm_format_t)-EINVAL; 348 } else { 349 switch (format) { 350 case SNDRV_PCM_FORMAT_MU_LAW: 351 for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { 352 snd_pcm_format_t format1 = preferred_formats[i]; 353 if (snd_mask_test(format_mask, (__force int)format1)) 354 return format1; 355 } 356 default: 357 return (__force snd_pcm_format_t)-EINVAL; 358 } 359 } 360 } 361 362 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 363 struct snd_pcm_hw_params *params, 364 struct snd_pcm_hw_params *slave_params) 365 { 366 struct snd_pcm_plugin_format tmpformat; 367 struct snd_pcm_plugin_format dstformat; 368 struct snd_pcm_plugin_format srcformat; 369 snd_pcm_access_t src_access, dst_access; 370 struct snd_pcm_plugin *plugin = NULL; 371 int err; 372 int stream = snd_pcm_plug_stream(plug); 373 int slave_interleaved = (params_channels(slave_params) == 1 || 374 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 375 376 switch (stream) { 377 case SNDRV_PCM_STREAM_PLAYBACK: 378 dstformat.format = params_format(slave_params); 379 dstformat.rate = params_rate(slave_params); 380 dstformat.channels = params_channels(slave_params); 381 srcformat.format = params_format(params); 382 srcformat.rate = params_rate(params); 383 srcformat.channels = params_channels(params); 384 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 385 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 386 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 387 break; 388 case SNDRV_PCM_STREAM_CAPTURE: 389 dstformat.format = params_format(params); 390 dstformat.rate = params_rate(params); 391 dstformat.channels = params_channels(params); 392 srcformat.format = params_format(slave_params); 393 srcformat.rate = params_rate(slave_params); 394 srcformat.channels = params_channels(slave_params); 395 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 396 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 397 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 398 break; 399 default: 400 snd_BUG(); 401 return -EINVAL; 402 } 403 tmpformat = srcformat; 404 405 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 406 srcformat.format, 407 srcformat.rate, 408 srcformat.channels); 409 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 410 dstformat.format, 411 dstformat.rate, 412 dstformat.channels); 413 414 /* Format change (linearization) */ 415 if (! rate_match(srcformat.rate, dstformat.rate) && 416 ! snd_pcm_format_linear(srcformat.format)) { 417 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 418 return -EINVAL; 419 tmpformat.format = SNDRV_PCM_FORMAT_S16; 420 err = snd_pcm_plugin_build_mulaw(plug, 421 &srcformat, &tmpformat, 422 &plugin); 423 if (err < 0) 424 return err; 425 err = snd_pcm_plugin_append(plugin); 426 if (err < 0) { 427 snd_pcm_plugin_free(plugin); 428 return err; 429 } 430 srcformat = tmpformat; 431 src_access = dst_access; 432 } 433 434 /* channels reduction */ 435 if (srcformat.channels > dstformat.channels) { 436 tmpformat.channels = dstformat.channels; 437 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 438 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 439 if (err < 0) 440 return err; 441 err = snd_pcm_plugin_append(plugin); 442 if (err < 0) { 443 snd_pcm_plugin_free(plugin); 444 return err; 445 } 446 srcformat = tmpformat; 447 src_access = dst_access; 448 } 449 450 /* rate resampling */ 451 if (!rate_match(srcformat.rate, dstformat.rate)) { 452 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 453 /* convert to S16 for resampling */ 454 tmpformat.format = SNDRV_PCM_FORMAT_S16; 455 err = snd_pcm_plugin_build_linear(plug, 456 &srcformat, &tmpformat, 457 &plugin); 458 if (err < 0) 459 return err; 460 err = snd_pcm_plugin_append(plugin); 461 if (err < 0) { 462 snd_pcm_plugin_free(plugin); 463 return err; 464 } 465 srcformat = tmpformat; 466 src_access = dst_access; 467 } 468 tmpformat.rate = dstformat.rate; 469 err = snd_pcm_plugin_build_rate(plug, 470 &srcformat, &tmpformat, 471 &plugin); 472 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 473 if (err < 0) 474 return err; 475 err = snd_pcm_plugin_append(plugin); 476 if (err < 0) { 477 snd_pcm_plugin_free(plugin); 478 return err; 479 } 480 srcformat = tmpformat; 481 src_access = dst_access; 482 } 483 484 /* format change */ 485 if (srcformat.format != dstformat.format) { 486 tmpformat.format = dstformat.format; 487 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 488 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 489 err = snd_pcm_plugin_build_mulaw(plug, 490 &srcformat, &tmpformat, 491 &plugin); 492 } 493 else if (snd_pcm_format_linear(srcformat.format) && 494 snd_pcm_format_linear(tmpformat.format)) { 495 err = snd_pcm_plugin_build_linear(plug, 496 &srcformat, &tmpformat, 497 &plugin); 498 } 499 else 500 return -EINVAL; 501 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 502 if (err < 0) 503 return err; 504 err = snd_pcm_plugin_append(plugin); 505 if (err < 0) { 506 snd_pcm_plugin_free(plugin); 507 return err; 508 } 509 srcformat = tmpformat; 510 src_access = dst_access; 511 } 512 513 /* channels extension */ 514 if (srcformat.channels < dstformat.channels) { 515 tmpformat.channels = dstformat.channels; 516 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 517 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 518 if (err < 0) 519 return err; 520 err = snd_pcm_plugin_append(plugin); 521 if (err < 0) { 522 snd_pcm_plugin_free(plugin); 523 return err; 524 } 525 srcformat = tmpformat; 526 src_access = dst_access; 527 } 528 529 /* de-interleave */ 530 if (src_access != dst_access) { 531 err = snd_pcm_plugin_build_copy(plug, 532 &srcformat, 533 &tmpformat, 534 &plugin); 535 pdprintf("interleave change (copy: returns %i)\n", err); 536 if (err < 0) 537 return err; 538 err = snd_pcm_plugin_append(plugin); 539 if (err < 0) { 540 snd_pcm_plugin_free(plugin); 541 return err; 542 } 543 } 544 545 return 0; 546 } 547 548 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 549 char *buf, 550 snd_pcm_uframes_t count, 551 struct snd_pcm_plugin_channel **channels) 552 { 553 struct snd_pcm_plugin *plugin; 554 struct snd_pcm_plugin_channel *v; 555 struct snd_pcm_plugin_format *format; 556 int width, nchannels, channel; 557 int stream = snd_pcm_plug_stream(plug); 558 559 if (snd_BUG_ON(!buf)) 560 return -ENXIO; 561 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 562 plugin = snd_pcm_plug_first(plug); 563 format = &plugin->src_format; 564 } else { 565 plugin = snd_pcm_plug_last(plug); 566 format = &plugin->dst_format; 567 } 568 v = plugin->buf_channels; 569 *channels = v; 570 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 571 return width; 572 nchannels = format->channels; 573 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 574 format->channels > 1)) 575 return -ENXIO; 576 for (channel = 0; channel < nchannels; channel++, v++) { 577 v->frames = count; 578 v->enabled = 1; 579 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 580 v->area.addr = buf; 581 v->area.first = channel * width; 582 v->area.step = nchannels * width; 583 } 584 return count; 585 } 586 587 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) 588 { 589 struct snd_pcm_plugin *plugin, *next; 590 struct snd_pcm_plugin_channel *dst_channels; 591 int err; 592 snd_pcm_sframes_t frames = size; 593 594 plugin = snd_pcm_plug_first(plug); 595 while (plugin && frames > 0) { 596 if ((next = plugin->next) != NULL) { 597 snd_pcm_sframes_t frames1 = frames; 598 if (plugin->dst_frames) 599 frames1 = plugin->dst_frames(plugin, frames); 600 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) { 601 return err; 602 } 603 if (err != frames1) { 604 frames = err; 605 if (plugin->src_frames) 606 frames = plugin->src_frames(plugin, frames1); 607 } 608 } else 609 dst_channels = NULL; 610 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 611 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 612 return frames; 613 src_channels = dst_channels; 614 plugin = next; 615 } 616 return snd_pcm_plug_client_size(plug, frames); 617 } 618 619 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) 620 { 621 struct snd_pcm_plugin *plugin, *next; 622 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 623 snd_pcm_sframes_t frames = size; 624 int err; 625 626 frames = snd_pcm_plug_slave_size(plug, frames); 627 if (frames < 0) 628 return frames; 629 630 src_channels = NULL; 631 plugin = snd_pcm_plug_first(plug); 632 while (plugin && frames > 0) { 633 if ((next = plugin->next) != NULL) { 634 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) { 635 return err; 636 } 637 frames = err; 638 } else { 639 dst_channels = dst_channels_final; 640 } 641 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 642 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 643 return frames; 644 plugin = next; 645 src_channels = dst_channels; 646 } 647 return frames; 648 } 649 650 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 651 size_t samples, snd_pcm_format_t format) 652 { 653 /* FIXME: sub byte resolution and odd dst_offset */ 654 unsigned char *dst; 655 unsigned int dst_step; 656 int width; 657 const unsigned char *silence; 658 if (!dst_area->addr) 659 return 0; 660 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 661 width = snd_pcm_format_physical_width(format); 662 if (width <= 0) 663 return -EINVAL; 664 if (dst_area->step == (unsigned int) width && width >= 8) 665 return snd_pcm_format_set_silence(format, dst, samples); 666 silence = snd_pcm_format_silence_64(format); 667 if (! silence) 668 return -EINVAL; 669 dst_step = dst_area->step / 8; 670 if (width == 4) { 671 /* Ima ADPCM */ 672 int dstbit = dst_area->first % 8; 673 int dstbit_step = dst_area->step % 8; 674 while (samples-- > 0) { 675 if (dstbit) 676 *dst &= 0xf0; 677 else 678 *dst &= 0x0f; 679 dst += dst_step; 680 dstbit += dstbit_step; 681 if (dstbit == 8) { 682 dst++; 683 dstbit = 0; 684 } 685 } 686 } else { 687 width /= 8; 688 while (samples-- > 0) { 689 memcpy(dst, silence, width); 690 dst += dst_step; 691 } 692 } 693 return 0; 694 } 695 696 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 697 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 698 size_t samples, snd_pcm_format_t format) 699 { 700 /* FIXME: sub byte resolution and odd dst_offset */ 701 char *src, *dst; 702 int width; 703 int src_step, dst_step; 704 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 705 if (!src_area->addr) 706 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 707 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 708 if (!dst_area->addr) 709 return 0; 710 width = snd_pcm_format_physical_width(format); 711 if (width <= 0) 712 return -EINVAL; 713 if (src_area->step == (unsigned int) width && 714 dst_area->step == (unsigned int) width && width >= 8) { 715 size_t bytes = samples * width / 8; 716 memcpy(dst, src, bytes); 717 return 0; 718 } 719 src_step = src_area->step / 8; 720 dst_step = dst_area->step / 8; 721 if (width == 4) { 722 /* Ima ADPCM */ 723 int srcbit = src_area->first % 8; 724 int srcbit_step = src_area->step % 8; 725 int dstbit = dst_area->first % 8; 726 int dstbit_step = dst_area->step % 8; 727 while (samples-- > 0) { 728 unsigned char srcval; 729 if (srcbit) 730 srcval = *src & 0x0f; 731 else 732 srcval = (*src & 0xf0) >> 4; 733 if (dstbit) 734 *dst = (*dst & 0xf0) | srcval; 735 else 736 *dst = (*dst & 0x0f) | (srcval << 4); 737 src += src_step; 738 srcbit += srcbit_step; 739 if (srcbit == 8) { 740 src++; 741 srcbit = 0; 742 } 743 dst += dst_step; 744 dstbit += dstbit_step; 745 if (dstbit == 8) { 746 dst++; 747 dstbit = 0; 748 } 749 } 750 } else { 751 width /= 8; 752 while (samples-- > 0) { 753 memcpy(dst, src, width); 754 src += src_step; 755 dst += dst_step; 756 } 757 } 758 return 0; 759 } 760