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("source_name=<name for the source> device=<ALSA device> format=<sample format> channels=<number of channels> rate=<sample rate> fragments=<number of fragments> fragment_size=<fragment size>")
  54
  55 struct userdata {
  56     snd_pcm_t *pcm_handle;
  57     snd_mixer_t *mixer_handle;
  58     snd_mixer_elem_t *mixer_elem;
  59     pa_source *source;
  60     struct pa_alsa_fdlist *pcm_fdl;
  61     struct pa_alsa_fdlist *mixer_fdl;
  62     long hw_volume_max, hw_volume_min;
  63
  64     size_t frame_size, fragment_size;
  65     pa_memchunk memchunk;
  66     pa_module *module;
  67 };
  68
  69 static const char* const valid_modargs[] = {
  70     "device",
  71     "source_name",
  72     "channels",
  73     "rate",
  74     "format",
  75     "fragments",
  76     "fragment_size",
  77     NULL
  78 };
  79
  80 #define DEFAULT_SOURCE_NAME "alsa_input"
  81 #define DEFAULT_DEVICE "default"
  82
  83 static void update_usage(struct userdata *u) {
  84    pa_module_set_used(u->module,
  85                       (u->source ? pa_idxset_size(u->source->outputs) : 0));
  86 }
  87
  88 static void xrun_recovery(struct userdata *u) {
  89     assert(u);
  90
  91     pa_log(__FILE__": *** ALSA-XRUN (capture) ***");
  92
  93     if (snd_pcm_prepare(u->pcm_handle) < 0)
  94         pa_log(__FILE__": snd_pcm_prepare() failed");
  95 }
  96
  97 static void do_read(struct userdata *u) {
  98     assert(u);
  99
 100     update_usage(u);
 101
 102     for (;;) {
 103         pa_memchunk post_memchunk;
 104         snd_pcm_sframes_t frames;
 105         size_t l;
 106
 107         if (!u->memchunk.memblock) {
 108             u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size, u->source->core->memblock_stat);
 109             u->memchunk.index = 0;
 110         }
 111
 112         assert(u->memchunk.memblock && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0);
 113
 114         if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
 115             if (frames == -EAGAIN)
 116                 return;
 117
 118             if (frames == -EPIPE) {
 119                 xrun_recovery(u);
 120                 continue;
 121             }
 122
 123             pa_log(__FILE__": snd_pcm_readi() failed: %s", strerror(-frames));
 124             return;
 125         }
 126
 127         l = frames * u->frame_size;
 128
 129         post_memchunk = u->memchunk;
 130         post_memchunk.length = l;
 131
 132         pa_source_post(u->source, &post_memchunk);
 133
 134         u->memchunk.index += l;
 135         u->memchunk.length -= l;
 136
 137         if (u->memchunk.length == 0) {
 138             pa_memblock_unref(u->memchunk.memblock);
 139             u->memchunk.memblock = NULL;
 140             u->memchunk.index = u->memchunk.length = 0;
 141         }
 142
 143         break;
 144     }
 145 }
 146
 147 static void fdl_callback(void *userdata) {
 148     struct userdata *u = userdata;
 149     assert(u);
 150
 151     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 152         xrun_recovery(u);
 153
 154     do_read(u);
 155 }
 156
 157 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 158     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 159
 160     assert(u && u->mixer_handle);
 161
 162     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 163         if (u->source->get_hw_volume)
 164             u->source->get_hw_volume(u->source);
 165         if (u->source->get_hw_mute)
 166             u->source->get_hw_mute(u->source);
 167         pa_subscription_post(u->source->core,
 168             PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
 169             u->source->index);
 170     }
 171
 172     return 0;
 173 }
 174
 175 static pa_usec_t source_get_latency_cb(pa_source *s) {
 176     struct userdata *u = s->userdata;
 177     snd_pcm_sframes_t frames;
 178     assert(s && u && u->source);
 179
 180     if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
 181         pa_log(__FILE__": failed to get delay");
 182         s->get_latency = NULL;
 183         return 0;
 184     }
 185
 186     return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 187 }
 188
 189 static int source_get_hw_volume_cb(pa_source *s) {
 190     struct userdata *u = s->userdata;
 191     long vol;
 192     int err;
 193     int i;
 194
 195     assert(u && u->mixer_elem);
 196
 197     for (i = 0;i < s->hw_volume.channels;i++) {
 198         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 199
 200         err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
 201         if (err < 0)
 202             goto fail;
 203         s->hw_volume.values[i] =
 204             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 205     }
 206
 207     return 0;
 208
 209 fail:
 210     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 211     s->get_hw_volume = NULL;
 212     s->set_hw_volume = NULL;
 213     return -1;
 214 }
 215
 216 static int source_set_hw_volume_cb(pa_source *s) {
 217     struct userdata *u = s->userdata;
 218     int err;
 219     pa_volume_t vol;
 220     int i;
 221
 222     assert(u && u->mixer_elem);
 223
 224     for (i = 0;i < s->hw_volume.channels;i++) {
 225         assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 226
 227         vol = s->hw_volume.values[i];
 228
 229         if (vol > PA_VOLUME_NORM)
 230             vol = PA_VOLUME_NORM;
 231
 232         vol = vol * (u->hw_volume_max - u->hw_volume_min) /
 233             PA_VOLUME_NORM + u->hw_volume_min;
 234         err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
 235         if (err < 0)
 236             goto fail;
 237     }
 238
 239     return 0;
 240
 241 fail:
 242     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 243     s->get_hw_volume = NULL;
 244     s->set_hw_volume = NULL;
 245     return -1;
 246 }
 247
 248 static int source_get_hw_mute_cb(pa_source *s) {
 249     struct userdata *u = s->userdata;
 250     int err, sw;
 251
 252     assert(u && u->mixer_elem);
 253
 254     err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
 255     if (err) {
 256         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 257         s->get_hw_mute = NULL;
 258         s->set_hw_mute = NULL;
 259         return -1;
 260     }
 261
 262     s->hw_muted = !sw;
 263
 264     return 0;
 265 }
 266
 267 static int source_set_hw_mute_cb(pa_source *s) {
 268     struct userdata *u = s->userdata;
 269     int err;
 270
 271     assert(u && u->mixer_elem);
 272
 273     err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
 274     if (err) {
 275         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 276         s->get_hw_mute = NULL;
 277         s->set_hw_mute = NULL;
 278         return -1;
 279     }
 280
 281     return 0;
 282 }
 283
 284 int pa__init(pa_core *c, pa_module*m) {
 285     pa_modargs *ma = NULL;
 286     int ret = -1;
 287     struct userdata *u = NULL;
 288     const char *dev;
 289     pa_sample_spec ss;
 290     unsigned periods, fragsize;
 291     snd_pcm_uframes_t period_size;
 292     size_t frame_size;
 293     snd_pcm_info_t *pcm_info = NULL;
 294     int err;
 295
 296     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 297         pa_log(__FILE__": failed to parse module arguments");
 298         goto fail;
 299     }
 300
 301     ss = c->default_sample_spec;
 302     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 303         pa_log(__FILE__": failed to parse sample specification");
 304         goto fail;
 305     }
 306     frame_size = pa_frame_size(&ss);
 307
 308     periods = 12;
 309     fragsize = 1024;
 310     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 311         pa_log(__FILE__": failed to parse buffer metrics");
 312         goto fail;
 313     }
 314     period_size = fragsize;
 315
 316     u = pa_xmalloc0(sizeof(struct userdata));
 317     m->userdata = u;
 318     u->module = m;
 319
 320     snd_config_update_free_global();
 321     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) {
 322         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 323         goto fail;
 324     }
 325
 326     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 327         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 328         pa_log(__FILE__": Error fetching PCM info: %s", snd_strerror(err));
 329         goto fail;
 330     }
 331
 332     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 333         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 334         goto fail;
 335     }
 336
 337     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 338         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 339         goto fail;
 340     }
 341
 342     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 343         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
 344         snd_mixer_close(u->mixer_handle);
 345         u->mixer_handle = NULL;
 346     }
 347
 348     u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL);
 349     assert(u->source);
 350
 351     u->source->userdata = u;
 352     u->source->get_latency = source_get_latency_cb;
 353     if (u->mixer_handle) {
 354         assert(u->mixer_elem);
 355         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 356             int i;
 357
 358             for (i = 0;i < ss.channels;i++) {
 359                 if (!snd_mixer_selem_has_capture_channel(u->mixer_elem, i))
 360                     break;
 361             }
 362
 363             if (i == ss.channels) {
 364                 u->source->get_hw_volume = source_get_hw_volume_cb;
 365                 u->source->set_hw_volume = source_set_hw_volume_cb;
 366                 snd_mixer_selem_get_capture_volume_range(
 367                     u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 368             }
 369         }
 370         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 371             u->source->get_hw_mute = source_get_hw_mute_cb;
 372             u->source->set_hw_mute = source_set_hw_mute_cb;
 373         }
 374     }
 375     pa_source_set_owner(u->source, m);
 376     u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s' (%s)", dev, snd_pcm_info_get_name(pcm_info));
 377
 378     u->pcm_fdl = pa_alsa_fdlist_new();
 379     assert(u->pcm_fdl);
 380     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 381         pa_log(__FILE__": failed to initialise file descriptor monitoring");
 382         goto fail;
 383     }
 384
 385     if (u->mixer_handle) {
 386         u->mixer_fdl = pa_alsa_fdlist_new();
 387         assert(u->mixer_fdl);
 388         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 389             pa_log(__FILE__": failed to initialise file descriptor monitoring");
 390             goto fail;
 391         }
 392         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 393         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 394     }
 395
 396     u->frame_size = frame_size;
 397     u->fragment_size = period_size;
 398
 399     pa_log(__FILE__": using %u fragments of size %lu bytes.", periods, (long unsigned)u->fragment_size);
 400
 401     u->memchunk.memblock = NULL;
 402     u->memchunk.index = u->memchunk.length = 0;
 403
 404     snd_pcm_start(u->pcm_handle);
 405
 406     ret = 0;
 407
 408     /* Get initial mixer settings */
 409     if (u->source->get_hw_volume)
 410         u->source->get_hw_volume(u->source);
 411     if (u->source->get_hw_mute)
 412         u->source->get_hw_mute(u->source);
 413
 414 finish:
 415      if (ma)
 416          pa_modargs_free(ma);
 417
 418     if (pcm_info)
 419         snd_pcm_info_free(pcm_info);
 420
 421     return ret;
 422
 423 fail:
 424
 425     if (u)
 426         pa__done(c, m);
 427
 428     goto finish;
 429 }
 430
 431 void pa__done(pa_core *c, pa_module*m) {
 432     struct userdata *u;
 433     assert(c && m);
 434
 435     if (!(u = m->userdata))
 436         return;
 437
 438     if (u->source) {
 439         pa_source_disconnect(u->source);
 440         pa_source_unref(u->source);
 441     }
 442
 443     if (u->pcm_fdl)
 444         pa_alsa_fdlist_free(u->pcm_fdl);
 445     if (u->mixer_fdl)
 446         pa_alsa_fdlist_free(u->mixer_fdl);
 447
 448     if (u->mixer_handle)
 449         snd_mixer_close(u->mixer_handle);
 450
 451     if (u->pcm_handle) {
 452         snd_pcm_drop(u->pcm_handle);
 453         snd_pcm_close(u->pcm_handle);
 454     }
 455
 456     if (u->memchunk.memblock)
 457         pa_memblock_unref(u->memchunk.memblock);
 458
 459     pa_xfree(u);
 460 }
 461