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 && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0);
 122
 123         if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
 124             if (frames == -EAGAIN)
 125                 return;
 126
 127             if (frames == -EPIPE) {
 128                 xrun_recovery(u);
 129                 continue;
 130             }
 131
 132             pa_log(__FILE__": snd_pcm_readi() failed: %s", strerror(-frames));
 133             return;
 134         }
 135
 136         l = frames * u->frame_size;
 137
 138         post_memchunk = u->memchunk;
 139         post_memchunk.length = l;
 140
 141         pa_source_post(u->source, &post_memchunk);
 142
 143         u->memchunk.index += l;
 144         u->memchunk.length -= l;
 145
 146         if (u->memchunk.length == 0) {
 147             pa_memblock_unref(u->memchunk.memblock);
 148             u->memchunk.memblock = NULL;
 149             u->memchunk.index = u->memchunk.length = 0;
 150         }
 151
 152         break;
 153     }
 154 }
 155
 156 static void fdl_callback(void *userdata) {
 157     struct userdata *u = userdata;
 158     assert(u);
 159
 160     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 161         xrun_recovery(u);
 162
 163     do_read(u);
 164 }
 165
 166 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 167     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 168
 169     assert(u && u->mixer_handle);
 170
 171     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 172         return 0;
 173
 174     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 175         if (u->source->get_hw_volume)
 176             u->source->get_hw_volume(u->source);
 177         if (u->source->get_hw_mute)
 178             u->source->get_hw_mute(u->source);
 179         pa_subscription_post(u->source->core,
 180             PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
 181             u->source->index);
 182     }
 183
 184     return 0;
 185 }
 186
 187 static pa_usec_t source_get_latency_cb(pa_source *s) {
 188     struct userdata *u = s->userdata;
 189     snd_pcm_sframes_t frames;
 190     assert(s && u && u->source);
 191
 192     if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
 193         pa_log(__FILE__": failed to get delay");
 194         s->get_latency = NULL;
 195         return 0;
 196     }
 197
 198     return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 199 }
 200
 201 static int source_get_hw_volume_cb(pa_source *s) {
 202     struct userdata *u = s->userdata;
 203     long vol;
 204     int err;
 205     int i;
 206
 207     assert(u && u->mixer_elem);
 208
 209     for (i = 0;i < s->hw_volume.channels;i++) {
 210         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 211
 212         err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
 213         if (err < 0)
 214             goto fail;
 215         s->hw_volume.values[i] =
 216             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 217     }
 218
 219     return 0;
 220
 221 fail:
 222     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 223     s->get_hw_volume = NULL;
 224     s->set_hw_volume = NULL;
 225     return -1;
 226 }
 227
 228 static int source_set_hw_volume_cb(pa_source *s) {
 229     struct userdata *u = s->userdata;
 230     int err;
 231     pa_volume_t vol;
 232     int i;
 233
 234     assert(u && u->mixer_elem);
 235
 236     for (i = 0;i < s->hw_volume.channels;i++) {
 237         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 238
 239         vol = s->hw_volume.values[i];
 240
 241         if (vol > PA_VOLUME_NORM)
 242             vol = PA_VOLUME_NORM;
 243
 244         vol = vol * (u->hw_volume_max - u->hw_volume_min) /
 245             PA_VOLUME_NORM + u->hw_volume_min;
 246         err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
 247         if (err < 0)
 248             goto fail;
 249     }
 250
 251     return 0;
 252
 253 fail:
 254     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 255     s->get_hw_volume = NULL;
 256     s->set_hw_volume = NULL;
 257     return -1;
 258 }
 259
 260 static int source_get_hw_mute_cb(pa_source *s) {
 261     struct userdata *u = s->userdata;
 262     int err, sw;
 263
 264     assert(u && u->mixer_elem);
 265
 266     err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
 267     if (err) {
 268         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 269         s->get_hw_mute = NULL;
 270         s->set_hw_mute = NULL;
 271         return -1;
 272     }
 273
 274     s->hw_muted = !sw;
 275
 276     return 0;
 277 }
 278
 279 static int source_set_hw_mute_cb(pa_source *s) {
 280     struct userdata *u = s->userdata;
 281     int err;
 282
 283     assert(u && u->mixer_elem);
 284
 285     err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
 286     if (err) {
 287         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 288         s->get_hw_mute = NULL;
 289         s->set_hw_mute = NULL;
 290         return -1;
 291     }
 292
 293     return 0;
 294 }
 295
 296 int pa__init(pa_core *c, pa_module*m) {
 297     pa_modargs *ma = NULL;
 298     int ret = -1;
 299     struct userdata *u = NULL;
 300     const char *dev;
 301     pa_sample_spec ss;
 302     pa_channel_map map;
 303     unsigned periods, fragsize;
 304     snd_pcm_uframes_t period_size;
 305     size_t frame_size;
 306     snd_pcm_info_t *pcm_info = NULL;
 307     int err;
 308
 309     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 310         pa_log(__FILE__": failed to parse module arguments");
 311         goto fail;
 312     }
 313
 314     ss = c->default_sample_spec;
 315     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 316         pa_log(__FILE__": failed to parse sample specification");
 317         goto fail;
 318     }
 319
 320     pa_alsa_channel_map_init_auto(&map, ss.channels);
 321     if ((pa_modargs_get_channel_map(ma, &map) < 0)) {
 322         pa_log(__FILE__": invalid channel map.");
 323         goto fail;
 324     }
 325
 326     if (ss.channels != map.channels) {
 327         pa_log(__FILE__": channel map and sample specification don't match.");
 328         goto fail;
 329     }
 330
 331     frame_size = pa_frame_size(&ss);
 332
 333     periods = 12;
 334     fragsize = 1024;
 335     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 336         pa_log(__FILE__": failed to parse buffer metrics");
 337         goto fail;
 338     }
 339     period_size = fragsize;
 340
 341     u = pa_xmalloc0(sizeof(struct userdata));
 342     m->userdata = u;
 343     u->module = m;
 344
 345     snd_config_update_free_global();
 346     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) {
 347         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 348         goto fail;
 349     }
 350
 351     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 352         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 353         pa_log(__FILE__": Error fetching PCM info: %s", snd_strerror(err));
 354         goto fail;
 355     }
 356
 357     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 358         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 359         goto fail;
 360     }
 361
 362     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 363         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 364         goto fail;
 365     }
 366
 367     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 368         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
 369         snd_mixer_close(u->mixer_handle);
 370         u->mixer_handle = NULL;
 371     }
 372
 373     u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map);
 374     assert(u->source);
 375
 376     u->source->userdata = u;
 377     u->source->get_latency = source_get_latency_cb;
 378     if (u->mixer_handle) {
 379         assert(u->mixer_elem);
 380         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 381             int i;
 382
 383             for (i = 0;i < ss.channels;i++) {
 384                 if (!snd_mixer_selem_has_capture_channel(u->mixer_elem, i))
 385                     break;
 386             }
 387
 388             if (i == ss.channels) {
 389                 u->source->get_hw_volume = source_get_hw_volume_cb;
 390                 u->source->set_hw_volume = source_set_hw_volume_cb;
 391                 snd_mixer_selem_get_capture_volume_range(
 392                     u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 393             }
 394         }
 395         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 396             u->source->get_hw_mute = source_get_hw_mute_cb;
 397             u->source->set_hw_mute = source_set_hw_mute_cb;
 398         }
 399     }
 400     pa_source_set_owner(u->source, m);
 401     u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s' (%s)", dev, snd_pcm_info_get_name(pcm_info));
 402
 403     u->pcm_fdl = pa_alsa_fdlist_new();
 404     assert(u->pcm_fdl);
 405     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 406         pa_log(__FILE__": failed to initialise file descriptor monitoring");
 407         goto fail;
 408     }
 409
 410     if (u->mixer_handle) {
 411         u->mixer_fdl = pa_alsa_fdlist_new();
 412         assert(u->mixer_fdl);
 413         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 414             pa_log(__FILE__": failed to initialise file descriptor monitoring");
 415             goto fail;
 416         }
 417         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 418         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 419     }
 420
 421     u->frame_size = frame_size;
 422     u->fragment_size = period_size;
 423
 424     pa_log(__FILE__": using %u fragments of size %lu bytes.", periods, (long unsigned)u->fragment_size);
 425
 426     u->memchunk.memblock = NULL;
 427     u->memchunk.index = u->memchunk.length = 0;
 428
 429     snd_pcm_start(u->pcm_handle);
 430
 431     ret = 0;
 432
 433     /* Get initial mixer settings */
 434     if (u->source->get_hw_volume)
 435         u->source->get_hw_volume(u->source);
 436     if (u->source->get_hw_mute)
 437         u->source->get_hw_mute(u->source);
 438
 439 finish:
 440      if (ma)
 441          pa_modargs_free(ma);
 442
 443     if (pcm_info)
 444         snd_pcm_info_free(pcm_info);
 445
 446     return ret;
 447
 448 fail:
 449
 450     if (u)
 451         pa__done(c, m);
 452
 453     goto finish;
 454 }
 455
 456 void pa__done(pa_core *c, pa_module*m) {
 457     struct userdata *u;
 458     assert(c && m);
 459
 460     if (!(u = m->userdata))
 461         return;
 462
 463     if (u->source) {
 464         pa_source_disconnect(u->source);
 465         pa_source_unref(u->source);
 466     }
 467
 468     if (u->pcm_fdl)
 469         pa_alsa_fdlist_free(u->pcm_fdl);
 470     if (u->mixer_fdl)
 471         pa_alsa_fdlist_free(u->mixer_fdl);
 472
 473     if (u->mixer_handle)
 474         snd_mixer_close(u->mixer_handle);
 475
 476     if (u->pcm_handle) {
 477         snd_pcm_drop(u->pcm_handle);
 478         snd_pcm_close(u->pcm_handle);
 479     }
 480
 481     if (u->memchunk.memblock)
 482         pa_memblock_unref(u->memchunk.memblock);
 483
 484     pa_xfree(u);
 485 }
 486