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