code.delx.au - pulseaudio/blob - src/modules/module-alsa-source.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <stdio.h>
  28
  29 #ifdef HAVE_SYS_POLL_H
  30 #include <sys/poll.h>
  31 #else
  32 #include "poll.h"
  33 #endif
  34
  35 #include <asoundlib.h>
  36
  37 #include <polypcore/core.h>
  38 #include <polypcore/module.h>
  39 #include <polypcore/memchunk.h>
  40 #include <polypcore/sink.h>
  41 #include <polypcore/modargs.h>
  42 #include <polypcore/util.h>
  43 #include <polypcore/sample-util.h>
  44 #include <polypcore/xmalloc.h>
  45 #include <polypcore/log.h>
  46
  47 #include "alsa-util.h"
  48 #include "module-alsa-source-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("ALSA Source")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53 PA_MODULE_USAGE(
  54         "source_name=<name for the source> "
  55         "device=<ALSA device> "
  56         "format=<sample format> "
  57         "channels=<number of channels> "
  58         "rate=<sample rate> "
  59         "fragments=<number of fragments> "
  60         "fragment_size=<fragment size> "
  61         "channel_map=<channel map>")
  62
  63 struct userdata {
  64     snd_pcm_t *pcm_handle;
  65     snd_mixer_t *mixer_handle;
  66     snd_mixer_elem_t *mixer_elem;
  67     pa_source *source;
  68     struct pa_alsa_fdlist *pcm_fdl;
  69     struct pa_alsa_fdlist *mixer_fdl;
  70     long hw_volume_max, hw_volume_min;
  71
  72     size_t frame_size, fragment_size;
  73     pa_memchunk memchunk;
  74     pa_module *module;
  75 };
  76
  77 static const char* const valid_modargs[] = {
  78     "device",
  79     "source_name",
  80     "channels",
  81     "rate",
  82     "format",
  83     "fragments",
  84     "fragment_size",
  85     "channel_map",
  86     NULL
  87 };
  88
  89 #define DEFAULT_SOURCE_NAME "alsa_input"
  90 #define DEFAULT_DEVICE "default"
  91
  92 static void update_usage(struct userdata *u) {
  93    pa_module_set_used(u->module,
  94                       (u->source ? pa_idxset_size(u->source->outputs) : 0));
  95 }
  96
  97 static void xrun_recovery(struct userdata *u) {
  98     assert(u);
  99
 100     pa_log(__FILE__": *** ALSA-XRUN (capture) ***");
 101
 102     if (snd_pcm_prepare(u->pcm_handle) < 0)
 103         pa_log(__FILE__": snd_pcm_prepare() failed");
 104 }
 105
 106 static void do_read(struct userdata *u) {
 107     assert(u);
 108
 109     update_usage(u);
 110
 111     for (;;) {
 112         pa_memchunk post_memchunk;
 113         snd_pcm_sframes_t frames;
 114         size_t l;
 115
 116         if (!u->memchunk.memblock) {
 117             u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size, u->source->core->memblock_stat);
 118             u->memchunk.index = 0;
 119         }
 120
 121         assert(u->memchunk.memblock);
 122         assert(u->memchunk.length);
 123         assert(u->memchunk.memblock->data);
 124         assert(u->memchunk.memblock->length);
 125         assert(u->memchunk.length % u->frame_size == 0);
 126
 127         if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
 128             if (frames == -EAGAIN)
 129                 return;
 130
 131             if (frames == -EPIPE) {
 132                 xrun_recovery(u);
 133                 continue;
 134             }
 135
 136             pa_log(__FILE__": snd_pcm_readi() failed: %s", strerror(-frames));
 137             return;
 138         }
 139
 140         l = frames * u->frame_size;
 141
 142         post_memchunk = u->memchunk;
 143         post_memchunk.length = l;
 144
 145         pa_source_post(u->source, &post_memchunk);
 146
 147         u->memchunk.index += l;
 148         u->memchunk.length -= l;
 149
 150         if (u->memchunk.length == 0) {
 151             pa_memblock_unref(u->memchunk.memblock);
 152             u->memchunk.memblock = NULL;
 153             u->memchunk.index = u->memchunk.length = 0;
 154         }
 155
 156         break;
 157     }
 158 }
 159
 160 static void fdl_callback(void *userdata) {
 161     struct userdata *u = userdata;
 162     assert(u);
 163
 164     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 165         xrun_recovery(u);
 166
 167     do_read(u);
 168 }
 169
 170 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 171     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 172
 173     assert(u && u->mixer_handle);
 174
 175     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 176         return 0;
 177
 178     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 179         if (u->source->get_hw_volume)
 180             u->source->get_hw_volume(u->source);
 181         if (u->source->get_hw_mute)
 182             u->source->get_hw_mute(u->source);
 183         pa_subscription_post(u->source->core,
 184             PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
 185             u->source->index);
 186     }
 187
 188     return 0;
 189 }
 190
 191 static pa_usec_t source_get_latency_cb(pa_source *s) {
 192     struct userdata *u = s->userdata;
 193     snd_pcm_sframes_t frames;
 194     assert(s && u && u->source);
 195
 196     if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
 197         pa_log(__FILE__": failed to get delay");
 198         s->get_latency = NULL;
 199         return 0;
 200     }
 201
 202     return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 203 }
 204
 205 static int source_get_hw_volume_cb(pa_source *s) {
 206     struct userdata *u = s->userdata;
 207     long vol;
 208     int err;
 209     int i;
 210
 211     assert(u && u->mixer_elem);
 212
 213     for (i = 0;i < s->hw_volume.channels;i++) {
 214         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 215
 216         err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
 217         if (err < 0)
 218             goto fail;
 219         s->hw_volume.values[i] =
 220             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 221     }
 222
 223     return 0;
 224
 225 fail:
 226     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 227     s->get_hw_volume = NULL;
 228     s->set_hw_volume = NULL;
 229     return -1;
 230 }
 231
 232 static int source_set_hw_volume_cb(pa_source *s) {
 233     struct userdata *u = s->userdata;
 234     int err;
 235     pa_volume_t vol;
 236     int i;
 237
 238     assert(u && u->mixer_elem);
 239
 240     for (i = 0;i < s->hw_volume.channels;i++) {
 241         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 242
 243         vol = s->hw_volume.values[i];
 244
 245         if (vol > PA_VOLUME_NORM)
 246             vol = PA_VOLUME_NORM;
 247
 248         vol = vol * (u->hw_volume_max - u->hw_volume_min) /
 249             PA_VOLUME_NORM + u->hw_volume_min;
 250         err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
 251         if (err < 0)
 252             goto fail;
 253     }
 254
 255     return 0;
 256
 257 fail:
 258     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 259     s->get_hw_volume = NULL;
 260     s->set_hw_volume = NULL;
 261     return -1;
 262 }
 263
 264 static int source_get_hw_mute_cb(pa_source *s) {
 265     struct userdata *u = s->userdata;
 266     int err, sw;
 267
 268     assert(u && u->mixer_elem);
 269
 270     err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
 271     if (err) {
 272         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 273         s->get_hw_mute = NULL;
 274         s->set_hw_mute = NULL;
 275         return -1;
 276     }
 277
 278     s->hw_muted = !sw;
 279
 280     return 0;
 281 }
 282
 283 static int source_set_hw_mute_cb(pa_source *s) {
 284     struct userdata *u = s->userdata;
 285     int err;
 286
 287     assert(u && u->mixer_elem);
 288
 289     err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
 290     if (err) {
 291         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 292         s->get_hw_mute = NULL;
 293         s->set_hw_mute = NULL;
 294         return -1;
 295     }
 296
 297     return 0;
 298 }
 299
 300 int pa__init(pa_core *c, pa_module*m) {
 301     pa_modargs *ma = NULL;
 302     int ret = -1;
 303     struct userdata *u = NULL;
 304     const char *dev;
 305     pa_sample_spec ss;
 306     pa_channel_map map;
 307     unsigned periods, fragsize;
 308     snd_pcm_uframes_t period_size;
 309     size_t frame_size;
 310     snd_pcm_info_t *pcm_info = NULL;
 311     int err;
 312
 313     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 314         pa_log(__FILE__": failed to parse module arguments");
 315         goto fail;
 316     }
 317
 318     ss = c->default_sample_spec;
 319     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 320         pa_log(__FILE__": failed to parse sample specification");
 321         goto fail;
 322     }
 323
 324     pa_alsa_channel_map_init_auto(&map, ss.channels);
 325     if ((pa_modargs_get_channel_map(ma, &map) < 0)) {
 326         pa_log(__FILE__": invalid channel map.");
 327         goto fail;
 328     }
 329
 330     if (ss.channels != map.channels) {
 331         pa_log(__FILE__": channel map and sample specification don't match.");
 332         goto fail;
 333     }
 334
 335     frame_size = pa_frame_size(&ss);
 336
 337     periods = 12;
 338     fragsize = frame_size*1024;
 339     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 340         pa_log(__FILE__": failed to parse buffer metrics");
 341         goto fail;
 342     }
 343     period_size = fragsize/frame_size;
 344
 345     u = pa_xmalloc0(sizeof(struct userdata));
 346     m->userdata = u;
 347     u->module = m;
 348
 349     snd_config_update_free_global();
 350     if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
 351         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 352         goto fail;
 353     }
 354
 355     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 356         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 357         pa_log(__FILE__": Error fetching PCM info: %s", snd_strerror(err));
 358         goto fail;
 359     }
 360
 361     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 362         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 363         goto fail;
 364     }
 365
 366     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 367         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 368         goto fail;
 369     }
 370
 371     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 372         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
 373         snd_mixer_close(u->mixer_handle);
 374         u->mixer_handle = NULL;
 375     }
 376
 377     u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map);
 378     assert(u->source);
 379
 380     u->source->userdata = u;
 381     u->source->get_latency = source_get_latency_cb;
 382     if (u->mixer_handle) {
 383         assert(u->mixer_elem);
 384         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 385             int i;
 386
 387             for (i = 0;i < ss.channels;i++) {
 388                 if (!snd_mixer_selem_has_capture_channel(u->mixer_elem, i))
 389                     break;
 390             }
 391
 392             if (i == ss.channels) {
 393                 u->source->get_hw_volume = source_get_hw_volume_cb;
 394                 u->source->set_hw_volume = source_set_hw_volume_cb;
 395                 snd_mixer_selem_get_capture_volume_range(
 396                     u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 397             }
 398         }
 399         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 400             u->source->get_hw_mute = source_get_hw_mute_cb;
 401             u->source->set_hw_mute = source_set_hw_mute_cb;
 402         }
 403     }
 404     pa_source_set_owner(u->source, m);
 405     u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s' (%s)", dev, snd_pcm_info_get_name(pcm_info));
 406
 407     u->pcm_fdl = pa_alsa_fdlist_new();
 408     assert(u->pcm_fdl);
 409     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 410         pa_log(__FILE__": failed to initialise file descriptor monitoring");
 411         goto fail;
 412     }
 413
 414     if (u->mixer_handle) {
 415         u->mixer_fdl = pa_alsa_fdlist_new();
 416         assert(u->mixer_fdl);
 417         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 418             pa_log(__FILE__": failed to initialise file descriptor monitoring");
 419             goto fail;
 420         }
 421         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 422         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 423     }
 424
 425     u->frame_size = frame_size;
 426     u->fragment_size = period_size * frame_size;
 427
 428     pa_log(__FILE__": using %u fragments of size %lu bytes.", periods, (long unsigned) u->fragment_size);
 429
 430     u->memchunk.memblock = NULL;
 431     u->memchunk.index = u->memchunk.length = 0;
 432
 433     snd_pcm_start(u->pcm_handle);
 434
 435     ret = 0;
 436
 437     /* Get initial mixer settings */
 438     if (u->source->get_hw_volume)
 439         u->source->get_hw_volume(u->source);
 440     if (u->source->get_hw_mute)
 441         u->source->get_hw_mute(u->source);
 442
 443 finish:
 444      if (ma)
 445          pa_modargs_free(ma);
 446
 447     if (pcm_info)
 448         snd_pcm_info_free(pcm_info);
 449
 450     return ret;
 451
 452 fail:
 453
 454     if (u)
 455         pa__done(c, m);
 456
 457     goto finish;
 458 }
 459
 460 void pa__done(pa_core *c, pa_module*m) {
 461     struct userdata *u;
 462     assert(c && m);
 463
 464     if (!(u = m->userdata))
 465         return;
 466
 467     if (u->source) {
 468         pa_source_disconnect(u->source);
 469         pa_source_unref(u->source);
 470     }
 471
 472     if (u->pcm_fdl)
 473         pa_alsa_fdlist_free(u->pcm_fdl);
 474     if (u->mixer_fdl)
 475         pa_alsa_fdlist_free(u->mixer_fdl);
 476
 477     if (u->mixer_handle)
 478         snd_mixer_close(u->mixer_handle);
 479
 480     if (u->pcm_handle) {
 481         snd_pcm_drop(u->pcm_handle);
 482         snd_pcm_close(u->pcm_handle);
 483     }
 484
 485     if (u->memchunk.memblock)
 486         pa_memblock_unref(u->memchunk.memblock);
 487
 488     pa_xfree(u);
 489 }
 490