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_BUG_ON((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_BUG_ON((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 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] & lower_32_bits(linfmts)) 285 formats.bits[0] |= lower_32_bits(linfmts); 286 if (formats.bits[1] & upper_32_bits(linfmts)) 287 formats.bits[1] |= upper_32_bits(linfmts); 288 return snd_mask_test(&formats, (__force int)format); 289 } 290 291 static const 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 /* fall through */ 357 default: 358 return (__force snd_pcm_format_t)-EINVAL; 359 } 360 } 361 } 362 363 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, 364 struct snd_pcm_hw_params *params, 365 struct snd_pcm_hw_params *slave_params) 366 { 367 struct snd_pcm_plugin_format tmpformat; 368 struct snd_pcm_plugin_format dstformat; 369 struct snd_pcm_plugin_format srcformat; 370 snd_pcm_access_t src_access, dst_access; 371 struct snd_pcm_plugin *plugin = NULL; 372 int err; 373 int stream = snd_pcm_plug_stream(plug); 374 int slave_interleaved = (params_channels(slave_params) == 1 || 375 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); 376 377 switch (stream) { 378 case SNDRV_PCM_STREAM_PLAYBACK: 379 dstformat.format = params_format(slave_params); 380 dstformat.rate = params_rate(slave_params); 381 dstformat.channels = params_channels(slave_params); 382 srcformat.format = params_format(params); 383 srcformat.rate = params_rate(params); 384 srcformat.channels = params_channels(params); 385 src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 386 dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 387 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 388 break; 389 case SNDRV_PCM_STREAM_CAPTURE: 390 dstformat.format = params_format(params); 391 dstformat.rate = params_rate(params); 392 dstformat.channels = params_channels(params); 393 srcformat.format = params_format(slave_params); 394 srcformat.rate = params_rate(slave_params); 395 srcformat.channels = params_channels(slave_params); 396 src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : 397 SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 398 dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; 399 break; 400 default: 401 snd_BUG(); 402 return -EINVAL; 403 } 404 tmpformat = srcformat; 405 406 pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 407 srcformat.format, 408 srcformat.rate, 409 srcformat.channels); 410 pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 411 dstformat.format, 412 dstformat.rate, 413 dstformat.channels); 414 415 /* Format change (linearization) */ 416 if (! rate_match(srcformat.rate, dstformat.rate) && 417 ! snd_pcm_format_linear(srcformat.format)) { 418 if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) 419 return -EINVAL; 420 tmpformat.format = SNDRV_PCM_FORMAT_S16; 421 err = snd_pcm_plugin_build_mulaw(plug, 422 &srcformat, &tmpformat, 423 &plugin); 424 if (err < 0) 425 return err; 426 err = snd_pcm_plugin_append(plugin); 427 if (err < 0) { 428 snd_pcm_plugin_free(plugin); 429 return err; 430 } 431 srcformat = tmpformat; 432 src_access = dst_access; 433 } 434 435 /* channels reduction */ 436 if (srcformat.channels > dstformat.channels) { 437 tmpformat.channels = dstformat.channels; 438 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 439 pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 440 if (err < 0) 441 return err; 442 err = snd_pcm_plugin_append(plugin); 443 if (err < 0) { 444 snd_pcm_plugin_free(plugin); 445 return err; 446 } 447 srcformat = tmpformat; 448 src_access = dst_access; 449 } 450 451 /* rate resampling */ 452 if (!rate_match(srcformat.rate, dstformat.rate)) { 453 if (srcformat.format != SNDRV_PCM_FORMAT_S16) { 454 /* convert to S16 for resampling */ 455 tmpformat.format = SNDRV_PCM_FORMAT_S16; 456 err = snd_pcm_plugin_build_linear(plug, 457 &srcformat, &tmpformat, 458 &plugin); 459 if (err < 0) 460 return err; 461 err = snd_pcm_plugin_append(plugin); 462 if (err < 0) { 463 snd_pcm_plugin_free(plugin); 464 return err; 465 } 466 srcformat = tmpformat; 467 src_access = dst_access; 468 } 469 tmpformat.rate = dstformat.rate; 470 err = snd_pcm_plugin_build_rate(plug, 471 &srcformat, &tmpformat, 472 &plugin); 473 pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); 474 if (err < 0) 475 return err; 476 err = snd_pcm_plugin_append(plugin); 477 if (err < 0) { 478 snd_pcm_plugin_free(plugin); 479 return err; 480 } 481 srcformat = tmpformat; 482 src_access = dst_access; 483 } 484 485 /* format change */ 486 if (srcformat.format != dstformat.format) { 487 tmpformat.format = dstformat.format; 488 if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || 489 tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { 490 err = snd_pcm_plugin_build_mulaw(plug, 491 &srcformat, &tmpformat, 492 &plugin); 493 } 494 else if (snd_pcm_format_linear(srcformat.format) && 495 snd_pcm_format_linear(tmpformat.format)) { 496 err = snd_pcm_plugin_build_linear(plug, 497 &srcformat, &tmpformat, 498 &plugin); 499 } 500 else 501 return -EINVAL; 502 pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); 503 if (err < 0) 504 return err; 505 err = snd_pcm_plugin_append(plugin); 506 if (err < 0) { 507 snd_pcm_plugin_free(plugin); 508 return err; 509 } 510 srcformat = tmpformat; 511 src_access = dst_access; 512 } 513 514 /* channels extension */ 515 if (srcformat.channels < dstformat.channels) { 516 tmpformat.channels = dstformat.channels; 517 err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); 518 pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); 519 if (err < 0) 520 return err; 521 err = snd_pcm_plugin_append(plugin); 522 if (err < 0) { 523 snd_pcm_plugin_free(plugin); 524 return err; 525 } 526 srcformat = tmpformat; 527 src_access = dst_access; 528 } 529 530 /* de-interleave */ 531 if (src_access != dst_access) { 532 err = snd_pcm_plugin_build_copy(plug, 533 &srcformat, 534 &tmpformat, 535 &plugin); 536 pdprintf("interleave change (copy: returns %i)\n", err); 537 if (err < 0) 538 return err; 539 err = snd_pcm_plugin_append(plugin); 540 if (err < 0) { 541 snd_pcm_plugin_free(plugin); 542 return err; 543 } 544 } 545 546 return 0; 547 } 548 549 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, 550 char *buf, 551 snd_pcm_uframes_t count, 552 struct snd_pcm_plugin_channel **channels) 553 { 554 struct snd_pcm_plugin *plugin; 555 struct snd_pcm_plugin_channel *v; 556 struct snd_pcm_plugin_format *format; 557 int width, nchannels, channel; 558 int stream = snd_pcm_plug_stream(plug); 559 560 if (snd_BUG_ON(!buf)) 561 return -ENXIO; 562 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 563 plugin = snd_pcm_plug_first(plug); 564 format = &plugin->src_format; 565 } else { 566 plugin = snd_pcm_plug_last(plug); 567 format = &plugin->dst_format; 568 } 569 v = plugin->buf_channels; 570 *channels = v; 571 if ((width = snd_pcm_format_physical_width(format->format)) < 0) 572 return width; 573 nchannels = format->channels; 574 if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 575 format->channels > 1)) 576 return -ENXIO; 577 for (channel = 0; channel < nchannels; channel++, v++) { 578 v->frames = count; 579 v->enabled = 1; 580 v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); 581 v->area.addr = buf; 582 v->area.first = channel * width; 583 v->area.step = nchannels * width; 584 } 585 return count; 586 } 587 588 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) 589 { 590 struct snd_pcm_plugin *plugin, *next; 591 struct snd_pcm_plugin_channel *dst_channels; 592 int err; 593 snd_pcm_sframes_t frames = size; 594 595 plugin = snd_pcm_plug_first(plug); 596 while (plugin) { 597 if (frames <= 0) 598 return frames; 599 if ((next = plugin->next) != NULL) { 600 snd_pcm_sframes_t frames1 = frames; 601 if (plugin->dst_frames) { 602 frames1 = plugin->dst_frames(plugin, frames); 603 if (frames1 <= 0) 604 return frames1; 605 } 606 if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) { 607 return err; 608 } 609 if (err != frames1) { 610 frames = err; 611 if (plugin->src_frames) { 612 frames = plugin->src_frames(plugin, frames1); 613 if (frames <= 0) 614 return frames; 615 } 616 } 617 } else 618 dst_channels = NULL; 619 pdprintf("write plugin: %s, %li\n", plugin->name, frames); 620 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 621 return frames; 622 src_channels = dst_channels; 623 plugin = next; 624 } 625 return snd_pcm_plug_client_size(plug, frames); 626 } 627 628 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) 629 { 630 struct snd_pcm_plugin *plugin, *next; 631 struct snd_pcm_plugin_channel *src_channels, *dst_channels; 632 snd_pcm_sframes_t frames = size; 633 int err; 634 635 frames = snd_pcm_plug_slave_size(plug, frames); 636 if (frames < 0) 637 return frames; 638 639 src_channels = NULL; 640 plugin = snd_pcm_plug_first(plug); 641 while (plugin && frames > 0) { 642 if ((next = plugin->next) != NULL) { 643 if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) { 644 return err; 645 } 646 frames = err; 647 } else { 648 dst_channels = dst_channels_final; 649 } 650 pdprintf("read plugin: %s, %li\n", plugin->name, frames); 651 if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0) 652 return frames; 653 plugin = next; 654 src_channels = dst_channels; 655 } 656 return frames; 657 } 658 659 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 660 size_t samples, snd_pcm_format_t format) 661 { 662 /* FIXME: sub byte resolution and odd dst_offset */ 663 unsigned char *dst; 664 unsigned int dst_step; 665 int width; 666 const unsigned char *silence; 667 if (!dst_area->addr) 668 return 0; 669 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 670 width = snd_pcm_format_physical_width(format); 671 if (width <= 0) 672 return -EINVAL; 673 if (dst_area->step == (unsigned int) width && width >= 8) 674 return snd_pcm_format_set_silence(format, dst, samples); 675 silence = snd_pcm_format_silence_64(format); 676 if (! silence) 677 return -EINVAL; 678 dst_step = dst_area->step / 8; 679 if (width == 4) { 680 /* Ima ADPCM */ 681 int dstbit = dst_area->first % 8; 682 int dstbit_step = dst_area->step % 8; 683 while (samples-- > 0) { 684 if (dstbit) 685 *dst &= 0xf0; 686 else 687 *dst &= 0x0f; 688 dst += dst_step; 689 dstbit += dstbit_step; 690 if (dstbit == 8) { 691 dst++; 692 dstbit = 0; 693 } 694 } 695 } else { 696 width /= 8; 697 while (samples-- > 0) { 698 memcpy(dst, silence, width); 699 dst += dst_step; 700 } 701 } 702 return 0; 703 } 704 705 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, 706 const struct snd_pcm_channel_area *dst_area, size_t dst_offset, 707 size_t samples, snd_pcm_format_t format) 708 { 709 /* FIXME: sub byte resolution and odd dst_offset */ 710 char *src, *dst; 711 int width; 712 int src_step, dst_step; 713 src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; 714 if (!src_area->addr) 715 return snd_pcm_area_silence(dst_area, dst_offset, samples, format); 716 dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; 717 if (!dst_area->addr) 718 return 0; 719 width = snd_pcm_format_physical_width(format); 720 if (width <= 0) 721 return -EINVAL; 722 if (src_area->step == (unsigned int) width && 723 dst_area->step == (unsigned int) width && width >= 8) { 724 size_t bytes = samples * width / 8; 725 memcpy(dst, src, bytes); 726 return 0; 727 } 728 src_step = src_area->step / 8; 729 dst_step = dst_area->step / 8; 730 if (width == 4) { 731 /* Ima ADPCM */ 732 int srcbit = src_area->first % 8; 733 int srcbit_step = src_area->step % 8; 734 int dstbit = dst_area->first % 8; 735 int dstbit_step = dst_area->step % 8; 736 while (samples-- > 0) { 737 unsigned char srcval; 738 if (srcbit) 739 srcval = *src & 0x0f; 740 else 741 srcval = (*src & 0xf0) >> 4; 742 if (dstbit) 743 *dst = (*dst & 0xf0) | srcval; 744 else 745 *dst = (*dst & 0x0f) | (srcval << 4); 746 src += src_step; 747 srcbit += srcbit_step; 748 if (srcbit == 8) { 749 src++; 750 srcbit = 0; 751 } 752 dst += dst_step; 753 dstbit += dstbit_step; 754 if (dstbit == 8) { 755 dst++; 756 dstbit = 0; 757 } 758 } 759 } else { 760 width /= 8; 761 while (samples-- > 0) { 762 memcpy(dst, src, width); 763 src += src_step; 764 dst += dst_step; 765 } 766 } 767 return 0; 768 } 769