| 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 = array3_size(frames, format->channels, width); |
| 66 | /* check for too large period size once again */ |
| 67 | if (size > 1024 * 1024) |
| 68 | return -ENOMEM; |
| 69 | if (snd_BUG_ON(size % 8)) |
| 70 | return -ENXIO; |
| 71 | size /= 8; |
| 72 | if (plugin->buf_frames < frames) { |
| 73 | kvfree(plugin->buf); |
| 74 | plugin->buf = kvzalloc(size, GFP_KERNEL); |
| 75 | plugin->buf_frames = frames; |
| 76 | } |
| 77 | if (!plugin->buf) { |
| 78 | plugin->buf_frames = 0; |
| 79 | return -ENOMEM; |
| 80 | } |
| 81 | c = plugin->buf_channels; |
| 82 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { |
| 83 | for (channel = 0; channel < format->channels; channel++, c++) { |
| 84 | c->frames = frames; |
| 85 | c->enabled = 1; |
| 86 | c->wanted = 0; |
| 87 | c->area.addr = plugin->buf; |
| 88 | c->area.first = channel * width; |
| 89 | c->area.step = format->channels * width; |
| 90 | } |
| 91 | } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) { |
| 92 | if (snd_BUG_ON(size % format->channels)) |
| 93 | return -EINVAL; |
| 94 | size /= format->channels; |
| 95 | for (channel = 0; channel < format->channels; channel++, c++) { |
| 96 | c->frames = frames; |
| 97 | c->enabled = 1; |
| 98 | c->wanted = 0; |
| 99 | c->area.addr = plugin->buf + (channel * size); |
| 100 | c->area.first = 0; |
| 101 | c->area.step = width; |
| 102 | } |
| 103 | } else |
| 104 | return -EINVAL; |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames) |
| 109 | { |
| 110 | int err; |
| 111 | if (snd_BUG_ON(!snd_pcm_plug_first(plug))) |
| 112 | return -ENXIO; |
| 113 | if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { |
| 114 | struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug); |
| 115 | while (plugin->next) { |
| 116 | if (plugin->dst_frames) |
| 117 | frames = plugin->dst_frames(plugin, frames); |
| 118 | if ((snd_pcm_sframes_t)frames <= 0) |
| 119 | return -ENXIO; |
| 120 | plugin = plugin->next; |
| 121 | err = snd_pcm_plugin_alloc(plugin, frames); |
| 122 | if (err < 0) |
| 123 | return err; |
| 124 | } |
| 125 | } else { |
| 126 | struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug); |
| 127 | while (plugin->prev) { |
| 128 | if (plugin->src_frames) |
| 129 | frames = plugin->src_frames(plugin, frames); |
| 130 | if ((snd_pcm_sframes_t)frames <= 0) |
| 131 | return -ENXIO; |
| 132 | plugin = plugin->prev; |
| 133 | err = snd_pcm_plugin_alloc(plugin, frames); |
| 134 | if (err < 0) |
| 135 | return err; |
| 136 | } |
| 137 | } |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | |
| 142 | snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, |
| 143 | snd_pcm_uframes_t frames, |
| 144 | struct snd_pcm_plugin_channel **channels) |
| 145 | { |
| 146 | *channels = plugin->buf_channels; |
| 147 | return frames; |
| 148 | } |
| 149 | |
| 150 | int snd_pcm_plugin_build(struct snd_pcm_substream *plug, |
| 151 | const char *name, |
| 152 | struct snd_pcm_plugin_format *src_format, |
| 153 | struct snd_pcm_plugin_format *dst_format, |
| 154 | size_t extra, |
| 155 | struct snd_pcm_plugin **ret) |
| 156 | { |
| 157 | struct snd_pcm_plugin *plugin; |
| 158 | unsigned int channels; |
| 159 | |
| 160 | if (snd_BUG_ON(!plug)) |
| 161 | return -ENXIO; |
| 162 | if (snd_BUG_ON(!src_format || !dst_format)) |
| 163 | return -ENXIO; |
| 164 | plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL); |
| 165 | if (plugin == NULL) |
| 166 | return -ENOMEM; |
| 167 | plugin->name = name; |
| 168 | plugin->plug = plug; |
| 169 | plugin->stream = snd_pcm_plug_stream(plug); |
| 170 | plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; |
| 171 | plugin->src_format = *src_format; |
| 172 | plugin->src_width = snd_pcm_format_physical_width(src_format->format); |
| 173 | snd_BUG_ON(plugin->src_width <= 0); |
| 174 | plugin->dst_format = *dst_format; |
| 175 | plugin->dst_width = snd_pcm_format_physical_width(dst_format->format); |
| 176 | snd_BUG_ON(plugin->dst_width <= 0); |
| 177 | if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 178 | channels = src_format->channels; |
| 179 | else |
| 180 | channels = dst_format->channels; |
| 181 | plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL); |
| 182 | if (plugin->buf_channels == NULL) { |
| 183 | snd_pcm_plugin_free(plugin); |
| 184 | return -ENOMEM; |
| 185 | } |
| 186 | plugin->client_channels = snd_pcm_plugin_client_channels; |
| 187 | *ret = plugin; |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin) |
| 192 | { |
| 193 | if (! plugin) |
| 194 | return 0; |
| 195 | if (plugin->private_free) |
| 196 | plugin->private_free(plugin); |
| 197 | kfree(plugin->buf_channels); |
| 198 | kvfree(plugin->buf); |
| 199 | kfree(plugin); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug, |
| 204 | snd_pcm_sframes_t frames, |
| 205 | bool check_size) |
| 206 | { |
| 207 | struct snd_pcm_plugin *plugin, *plugin_next; |
| 208 | |
| 209 | plugin = snd_pcm_plug_first(plug); |
| 210 | while (plugin && frames > 0) { |
| 211 | plugin_next = plugin->next; |
| 212 | if (check_size && plugin->buf_frames && |
| 213 | frames > plugin->buf_frames) |
| 214 | frames = plugin->buf_frames; |
| 215 | if (plugin->dst_frames) { |
| 216 | frames = plugin->dst_frames(plugin, frames); |
| 217 | if (frames < 0) |
| 218 | return frames; |
| 219 | } |
| 220 | plugin = plugin_next; |
| 221 | } |
| 222 | return frames; |
| 223 | } |
| 224 | |
| 225 | static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug, |
| 226 | snd_pcm_sframes_t frames, |
| 227 | bool check_size) |
| 228 | { |
| 229 | struct snd_pcm_plugin *plugin, *plugin_prev; |
| 230 | |
| 231 | plugin = snd_pcm_plug_last(plug); |
| 232 | while (plugin && frames > 0) { |
| 233 | plugin_prev = plugin->prev; |
| 234 | if (plugin->src_frames) { |
| 235 | frames = plugin->src_frames(plugin, frames); |
| 236 | if (frames < 0) |
| 237 | return frames; |
| 238 | } |
| 239 | if (check_size && plugin->buf_frames && |
| 240 | frames > plugin->buf_frames) |
| 241 | frames = plugin->buf_frames; |
| 242 | plugin = plugin_prev; |
| 243 | } |
| 244 | return frames; |
| 245 | } |
| 246 | |
| 247 | snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames) |
| 248 | { |
| 249 | if (snd_BUG_ON(!plug)) |
| 250 | return -ENXIO; |
| 251 | switch (snd_pcm_plug_stream(plug)) { |
| 252 | case SNDRV_PCM_STREAM_PLAYBACK: |
| 253 | return calc_src_frames(plug, drv_frames, false); |
| 254 | case SNDRV_PCM_STREAM_CAPTURE: |
| 255 | return calc_dst_frames(plug, drv_frames, false); |
| 256 | default: |
| 257 | snd_BUG(); |
| 258 | return -EINVAL; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) |
| 263 | { |
| 264 | if (snd_BUG_ON(!plug)) |
| 265 | return -ENXIO; |
| 266 | switch (snd_pcm_plug_stream(plug)) { |
| 267 | case SNDRV_PCM_STREAM_PLAYBACK: |
| 268 | return calc_dst_frames(plug, clt_frames, false); |
| 269 | case SNDRV_PCM_STREAM_CAPTURE: |
| 270 | return calc_src_frames(plug, clt_frames, false); |
| 271 | default: |
| 272 | snd_BUG(); |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static int snd_pcm_plug_formats(const struct snd_mask *mask, |
| 278 | snd_pcm_format_t format) |
| 279 | { |
| 280 | struct snd_mask formats = *mask; |
| 281 | u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | |
| 282 | SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | |
| 283 | SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | |
| 284 | SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | |
| 285 | SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | |
| 286 | SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | |
| 287 | SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | |
| 288 | SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | |
| 289 | SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); |
| 290 | snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); |
| 291 | |
| 292 | if (formats.bits[0] & lower_32_bits(linfmts)) |
| 293 | formats.bits[0] |= lower_32_bits(linfmts); |
| 294 | if (formats.bits[1] & upper_32_bits(linfmts)) |
| 295 | formats.bits[1] |= upper_32_bits(linfmts); |
| 296 | return snd_mask_test(&formats, (__force int)format); |
| 297 | } |
| 298 | |
| 299 | static const snd_pcm_format_t preferred_formats[] = { |
| 300 | SNDRV_PCM_FORMAT_S16_LE, |
| 301 | SNDRV_PCM_FORMAT_S16_BE, |
| 302 | SNDRV_PCM_FORMAT_U16_LE, |
| 303 | SNDRV_PCM_FORMAT_U16_BE, |
| 304 | SNDRV_PCM_FORMAT_S24_3LE, |
| 305 | SNDRV_PCM_FORMAT_S24_3BE, |
| 306 | SNDRV_PCM_FORMAT_U24_3LE, |
| 307 | SNDRV_PCM_FORMAT_U24_3BE, |
| 308 | SNDRV_PCM_FORMAT_S24_LE, |
| 309 | SNDRV_PCM_FORMAT_S24_BE, |
| 310 | SNDRV_PCM_FORMAT_U24_LE, |
| 311 | SNDRV_PCM_FORMAT_U24_BE, |
| 312 | SNDRV_PCM_FORMAT_S32_LE, |
| 313 | SNDRV_PCM_FORMAT_S32_BE, |
| 314 | SNDRV_PCM_FORMAT_U32_LE, |
| 315 | SNDRV_PCM_FORMAT_U32_BE, |
| 316 | SNDRV_PCM_FORMAT_S8, |
| 317 | SNDRV_PCM_FORMAT_U8 |
| 318 | }; |
| 319 | |
| 320 | snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, |
| 321 | const struct snd_mask *format_mask) |
| 322 | { |
| 323 | int i; |
| 324 | |
| 325 | if (snd_mask_test(format_mask, (__force int)format)) |
| 326 | return format; |
| 327 | if (!snd_pcm_plug_formats(format_mask, format)) |
| 328 | return (__force snd_pcm_format_t)-EINVAL; |
| 329 | if (snd_pcm_format_linear(format)) { |
| 330 | unsigned int width = snd_pcm_format_width(format); |
| 331 | int unsignd = snd_pcm_format_unsigned(format) > 0; |
| 332 | int big = snd_pcm_format_big_endian(format) > 0; |
| 333 | unsigned int badness, best = -1; |
| 334 | snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; |
| 335 | for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { |
| 336 | snd_pcm_format_t f = preferred_formats[i]; |
| 337 | unsigned int w; |
| 338 | if (!snd_mask_test(format_mask, (__force int)f)) |
| 339 | continue; |
| 340 | w = snd_pcm_format_width(f); |
| 341 | if (w >= width) |
| 342 | badness = w - width; |
| 343 | else |
| 344 | badness = width - w + 32; |
| 345 | badness += snd_pcm_format_unsigned(f) != unsignd; |
| 346 | badness += snd_pcm_format_big_endian(f) != big; |
| 347 | if (badness < best) { |
| 348 | best_format = f; |
| 349 | best = badness; |
| 350 | } |
| 351 | } |
| 352 | if ((__force int)best_format >= 0) |
| 353 | return best_format; |
| 354 | else |
| 355 | return (__force snd_pcm_format_t)-EINVAL; |
| 356 | } else { |
| 357 | switch (format) { |
| 358 | case SNDRV_PCM_FORMAT_MU_LAW: |
| 359 | for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { |
| 360 | snd_pcm_format_t format1 = preferred_formats[i]; |
| 361 | if (snd_mask_test(format_mask, (__force int)format1)) |
| 362 | return format1; |
| 363 | } |
| 364 | fallthrough; |
| 365 | default: |
| 366 | return (__force snd_pcm_format_t)-EINVAL; |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, |
| 372 | struct snd_pcm_hw_params *params, |
| 373 | struct snd_pcm_hw_params *slave_params) |
| 374 | { |
| 375 | struct snd_pcm_plugin_format tmpformat; |
| 376 | struct snd_pcm_plugin_format dstformat; |
| 377 | struct snd_pcm_plugin_format srcformat; |
| 378 | snd_pcm_access_t src_access, dst_access; |
| 379 | struct snd_pcm_plugin *plugin = NULL; |
| 380 | int err; |
| 381 | int stream = snd_pcm_plug_stream(plug); |
| 382 | int slave_interleaved = (params_channels(slave_params) == 1 || |
| 383 | params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); |
| 384 | |
| 385 | switch (stream) { |
| 386 | case SNDRV_PCM_STREAM_PLAYBACK: |
| 387 | dstformat.format = params_format(slave_params); |
| 388 | dstformat.rate = params_rate(slave_params); |
| 389 | dstformat.channels = params_channels(slave_params); |
| 390 | srcformat.format = params_format(params); |
| 391 | srcformat.rate = params_rate(params); |
| 392 | srcformat.channels = params_channels(params); |
| 393 | src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; |
| 394 | dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : |
| 395 | SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); |
| 396 | break; |
| 397 | case SNDRV_PCM_STREAM_CAPTURE: |
| 398 | dstformat.format = params_format(params); |
| 399 | dstformat.rate = params_rate(params); |
| 400 | dstformat.channels = params_channels(params); |
| 401 | srcformat.format = params_format(slave_params); |
| 402 | srcformat.rate = params_rate(slave_params); |
| 403 | srcformat.channels = params_channels(slave_params); |
| 404 | src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : |
| 405 | SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); |
| 406 | dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; |
| 407 | break; |
| 408 | default: |
| 409 | snd_BUG(); |
| 410 | return -EINVAL; |
| 411 | } |
| 412 | tmpformat = srcformat; |
| 413 | |
| 414 | pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", |
| 415 | srcformat.format, |
| 416 | srcformat.rate, |
| 417 | srcformat.channels); |
| 418 | pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", |
| 419 | dstformat.format, |
| 420 | dstformat.rate, |
| 421 | dstformat.channels); |
| 422 | |
| 423 | /* Format change (linearization) */ |
| 424 | if (! rate_match(srcformat.rate, dstformat.rate) && |
| 425 | ! snd_pcm_format_linear(srcformat.format)) { |
| 426 | if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) |
| 427 | return -EINVAL; |
| 428 | tmpformat.format = SNDRV_PCM_FORMAT_S16; |
| 429 | err = snd_pcm_plugin_build_mulaw(plug, |
| 430 | &srcformat, &tmpformat, |
| 431 | &plugin); |
| 432 | if (err < 0) |
| 433 | return err; |
| 434 | err = snd_pcm_plugin_append(plugin); |
| 435 | if (err < 0) { |
| 436 | snd_pcm_plugin_free(plugin); |
| 437 | return err; |
| 438 | } |
| 439 | srcformat = tmpformat; |
| 440 | src_access = dst_access; |
| 441 | } |
| 442 | |
| 443 | /* channels reduction */ |
| 444 | if (srcformat.channels > dstformat.channels) { |
| 445 | tmpformat.channels = dstformat.channels; |
| 446 | err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); |
| 447 | pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); |
| 448 | if (err < 0) |
| 449 | return err; |
| 450 | err = snd_pcm_plugin_append(plugin); |
| 451 | if (err < 0) { |
| 452 | snd_pcm_plugin_free(plugin); |
| 453 | return err; |
| 454 | } |
| 455 | srcformat = tmpformat; |
| 456 | src_access = dst_access; |
| 457 | } |
| 458 | |
| 459 | /* rate resampling */ |
| 460 | if (!rate_match(srcformat.rate, dstformat.rate)) { |
| 461 | if (srcformat.format != SNDRV_PCM_FORMAT_S16) { |
| 462 | /* convert to S16 for resampling */ |
| 463 | tmpformat.format = SNDRV_PCM_FORMAT_S16; |
| 464 | err = snd_pcm_plugin_build_linear(plug, |
| 465 | &srcformat, &tmpformat, |
| 466 | &plugin); |
| 467 | if (err < 0) |
| 468 | return err; |
| 469 | err = snd_pcm_plugin_append(plugin); |
| 470 | if (err < 0) { |
| 471 | snd_pcm_plugin_free(plugin); |
| 472 | return err; |
| 473 | } |
| 474 | srcformat = tmpformat; |
| 475 | src_access = dst_access; |
| 476 | } |
| 477 | tmpformat.rate = dstformat.rate; |
| 478 | err = snd_pcm_plugin_build_rate(plug, |
| 479 | &srcformat, &tmpformat, |
| 480 | &plugin); |
| 481 | pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); |
| 482 | if (err < 0) |
| 483 | return err; |
| 484 | err = snd_pcm_plugin_append(plugin); |
| 485 | if (err < 0) { |
| 486 | snd_pcm_plugin_free(plugin); |
| 487 | return err; |
| 488 | } |
| 489 | srcformat = tmpformat; |
| 490 | src_access = dst_access; |
| 491 | } |
| 492 | |
| 493 | /* format change */ |
| 494 | if (srcformat.format != dstformat.format) { |
| 495 | tmpformat.format = dstformat.format; |
| 496 | if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || |
| 497 | tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { |
| 498 | err = snd_pcm_plugin_build_mulaw(plug, |
| 499 | &srcformat, &tmpformat, |
| 500 | &plugin); |
| 501 | } |
| 502 | else if (snd_pcm_format_linear(srcformat.format) && |
| 503 | snd_pcm_format_linear(tmpformat.format)) { |
| 504 | err = snd_pcm_plugin_build_linear(plug, |
| 505 | &srcformat, &tmpformat, |
| 506 | &plugin); |
| 507 | } |
| 508 | else |
| 509 | return -EINVAL; |
| 510 | pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); |
| 511 | if (err < 0) |
| 512 | return err; |
| 513 | err = snd_pcm_plugin_append(plugin); |
| 514 | if (err < 0) { |
| 515 | snd_pcm_plugin_free(plugin); |
| 516 | return err; |
| 517 | } |
| 518 | srcformat = tmpformat; |
| 519 | src_access = dst_access; |
| 520 | } |
| 521 | |
| 522 | /* channels extension */ |
| 523 | if (srcformat.channels < dstformat.channels) { |
| 524 | tmpformat.channels = dstformat.channels; |
| 525 | err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); |
| 526 | pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); |
| 527 | if (err < 0) |
| 528 | return err; |
| 529 | err = snd_pcm_plugin_append(plugin); |
| 530 | if (err < 0) { |
| 531 | snd_pcm_plugin_free(plugin); |
| 532 | return err; |
| 533 | } |
| 534 | srcformat = tmpformat; |
| 535 | src_access = dst_access; |
| 536 | } |
| 537 | |
| 538 | /* de-interleave */ |
| 539 | if (src_access != dst_access) { |
| 540 | err = snd_pcm_plugin_build_copy(plug, |
| 541 | &srcformat, |
| 542 | &tmpformat, |
| 543 | &plugin); |
| 544 | pdprintf("interleave change (copy: returns %i)\n", err); |
| 545 | if (err < 0) |
| 546 | return err; |
| 547 | err = snd_pcm_plugin_append(plugin); |
| 548 | if (err < 0) { |
| 549 | snd_pcm_plugin_free(plugin); |
| 550 | return err; |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, |
| 558 | char *buf, |
| 559 | snd_pcm_uframes_t count, |
| 560 | struct snd_pcm_plugin_channel **channels) |
| 561 | { |
| 562 | struct snd_pcm_plugin *plugin; |
| 563 | struct snd_pcm_plugin_channel *v; |
| 564 | struct snd_pcm_plugin_format *format; |
| 565 | int width, nchannels, channel; |
| 566 | int stream = snd_pcm_plug_stream(plug); |
| 567 | |
| 568 | if (snd_BUG_ON(!buf)) |
| 569 | return -ENXIO; |
| 570 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| 571 | plugin = snd_pcm_plug_first(plug); |
| 572 | format = &plugin->src_format; |
| 573 | } else { |
| 574 | plugin = snd_pcm_plug_last(plug); |
| 575 | format = &plugin->dst_format; |
| 576 | } |
| 577 | v = plugin->buf_channels; |
| 578 | *channels = v; |
| 579 | width = snd_pcm_format_physical_width(format->format); |
| 580 | if (width < 0) |
| 581 | return width; |
| 582 | nchannels = format->channels; |
| 583 | if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && |
| 584 | format->channels > 1)) |
| 585 | return -ENXIO; |
| 586 | for (channel = 0; channel < nchannels; channel++, v++) { |
| 587 | v->frames = count; |
| 588 | v->enabled = 1; |
| 589 | v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); |
| 590 | v->area.addr = buf; |
| 591 | v->area.first = channel * width; |
| 592 | v->area.step = nchannels * width; |
| 593 | } |
| 594 | return count; |
| 595 | } |
| 596 | |
| 597 | 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) |
| 598 | { |
| 599 | struct snd_pcm_plugin *plugin, *next; |
| 600 | struct snd_pcm_plugin_channel *dst_channels; |
| 601 | int err; |
| 602 | snd_pcm_sframes_t frames = size; |
| 603 | |
| 604 | plugin = snd_pcm_plug_first(plug); |
| 605 | while (plugin) { |
| 606 | if (frames <= 0) |
| 607 | return frames; |
| 608 | next = plugin->next; |
| 609 | if (next) { |
| 610 | snd_pcm_sframes_t frames1 = frames; |
| 611 | if (plugin->dst_frames) { |
| 612 | frames1 = plugin->dst_frames(plugin, frames); |
| 613 | if (frames1 <= 0) |
| 614 | return frames1; |
| 615 | } |
| 616 | err = next->client_channels(next, frames1, &dst_channels); |
| 617 | if (err < 0) |
| 618 | return err; |
| 619 | if (err != frames1) { |
| 620 | frames = err; |
| 621 | if (plugin->src_frames) { |
| 622 | frames = plugin->src_frames(plugin, frames1); |
| 623 | if (frames <= 0) |
| 624 | return frames; |
| 625 | } |
| 626 | } |
| 627 | } else |
| 628 | dst_channels = NULL; |
| 629 | pdprintf("write plugin: %s, %li\n", plugin->name, frames); |
| 630 | frames = plugin->transfer(plugin, src_channels, dst_channels, frames); |
| 631 | if (frames < 0) |
| 632 | return frames; |
| 633 | src_channels = dst_channels; |
| 634 | plugin = next; |
| 635 | } |
| 636 | return calc_src_frames(plug, frames, true); |
| 637 | } |
| 638 | |
| 639 | 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) |
| 640 | { |
| 641 | struct snd_pcm_plugin *plugin, *next; |
| 642 | struct snd_pcm_plugin_channel *src_channels, *dst_channels; |
| 643 | snd_pcm_sframes_t frames = size; |
| 644 | int err; |
| 645 | |
| 646 | frames = calc_src_frames(plug, frames, true); |
| 647 | if (frames < 0) |
| 648 | return frames; |
| 649 | |
| 650 | src_channels = NULL; |
| 651 | plugin = snd_pcm_plug_first(plug); |
| 652 | while (plugin && frames > 0) { |
| 653 | next = plugin->next; |
| 654 | if (next) { |
| 655 | err = plugin->client_channels(plugin, frames, &dst_channels); |
| 656 | if (err < 0) |
| 657 | return err; |
| 658 | frames = err; |
| 659 | } else { |
| 660 | dst_channels = dst_channels_final; |
| 661 | } |
| 662 | pdprintf("read plugin: %s, %li\n", plugin->name, frames); |
| 663 | frames = plugin->transfer(plugin, src_channels, dst_channels, frames); |
| 664 | if (frames < 0) |
| 665 | return frames; |
| 666 | plugin = next; |
| 667 | src_channels = dst_channels; |
| 668 | } |
| 669 | return frames; |
| 670 | } |
| 671 | |
| 672 | int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, |
| 673 | size_t samples, snd_pcm_format_t format) |
| 674 | { |
| 675 | /* FIXME: sub byte resolution and odd dst_offset */ |
| 676 | unsigned char *dst; |
| 677 | unsigned int dst_step; |
| 678 | int width; |
| 679 | const unsigned char *silence; |
| 680 | if (!dst_area->addr) |
| 681 | return 0; |
| 682 | dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; |
| 683 | width = snd_pcm_format_physical_width(format); |
| 684 | if (width <= 0) |
| 685 | return -EINVAL; |
| 686 | if (dst_area->step == (unsigned int) width && width >= 8) |
| 687 | return snd_pcm_format_set_silence(format, dst, samples); |
| 688 | silence = snd_pcm_format_silence_64(format); |
| 689 | if (! silence) |
| 690 | return -EINVAL; |
| 691 | dst_step = dst_area->step / 8; |
| 692 | if (width == 4) { |
| 693 | /* Ima ADPCM */ |
| 694 | int dstbit = dst_area->first % 8; |
| 695 | int dstbit_step = dst_area->step % 8; |
| 696 | while (samples-- > 0) { |
| 697 | if (dstbit) |
| 698 | *dst &= 0xf0; |
| 699 | else |
| 700 | *dst &= 0x0f; |
| 701 | dst += dst_step; |
| 702 | dstbit += dstbit_step; |
| 703 | if (dstbit == 8) { |
| 704 | dst++; |
| 705 | dstbit = 0; |
| 706 | } |
| 707 | } |
| 708 | } else { |
| 709 | width /= 8; |
| 710 | while (samples-- > 0) { |
| 711 | memcpy(dst, silence, width); |
| 712 | dst += dst_step; |
| 713 | } |
| 714 | } |
| 715 | return 0; |
| 716 | } |
| 717 | |
| 718 | int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, |
| 719 | const struct snd_pcm_channel_area *dst_area, size_t dst_offset, |
| 720 | size_t samples, snd_pcm_format_t format) |
| 721 | { |
| 722 | /* FIXME: sub byte resolution and odd dst_offset */ |
| 723 | char *src, *dst; |
| 724 | int width; |
| 725 | int src_step, dst_step; |
| 726 | src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; |
| 727 | if (!src_area->addr) |
| 728 | return snd_pcm_area_silence(dst_area, dst_offset, samples, format); |
| 729 | dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; |
| 730 | if (!dst_area->addr) |
| 731 | return 0; |
| 732 | width = snd_pcm_format_physical_width(format); |
| 733 | if (width <= 0) |
| 734 | return -EINVAL; |
| 735 | if (src_area->step == (unsigned int) width && |
| 736 | dst_area->step == (unsigned int) width && width >= 8) { |
| 737 | size_t bytes = samples * width / 8; |
| 738 | memcpy(dst, src, bytes); |
| 739 | return 0; |
| 740 | } |
| 741 | src_step = src_area->step / 8; |
| 742 | dst_step = dst_area->step / 8; |
| 743 | if (width == 4) { |
| 744 | /* Ima ADPCM */ |
| 745 | int srcbit = src_area->first % 8; |
| 746 | int srcbit_step = src_area->step % 8; |
| 747 | int dstbit = dst_area->first % 8; |
| 748 | int dstbit_step = dst_area->step % 8; |
| 749 | while (samples-- > 0) { |
| 750 | unsigned char srcval; |
| 751 | if (srcbit) |
| 752 | srcval = *src & 0x0f; |
| 753 | else |
| 754 | srcval = (*src & 0xf0) >> 4; |
| 755 | if (dstbit) |
| 756 | *dst = (*dst & 0xf0) | srcval; |
| 757 | else |
| 758 | *dst = (*dst & 0x0f) | (srcval << 4); |
| 759 | src += src_step; |
| 760 | srcbit += srcbit_step; |
| 761 | if (srcbit == 8) { |
| 762 | src++; |
| 763 | srcbit = 0; |
| 764 | } |
| 765 | dst += dst_step; |
| 766 | dstbit += dstbit_step; |
| 767 | if (dstbit == 8) { |
| 768 | dst++; |
| 769 | dstbit = 0; |
| 770 | } |
| 771 | } |
| 772 | } else { |
| 773 | width /= 8; |
| 774 | while (samples-- > 0) { |
| 775 | memcpy(dst, src, width); |
| 776 | src += src_step; |
| 777 | dst += dst_step; |
| 778 | } |
| 779 | } |
| 780 | return 0; |
| 781 | } |