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
 194     assert(u && u->mixer_elem);
 195
 196     if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
 197         err = snd_mixer_selem_get_capture_volume(u->mixer_elem, 0, &vol);
 198         if (err < 0)
 199             goto fail;
 200         pa_cvolume_set(&s->hw_volume, s->hw_volume.channels,
 201             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min));
 202     } else {
 203         int i;
 204
 205         for (i = 0;i < s->hw_volume.channels;i++) {
 206             err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
 207             if (err < 0)
 208                 goto fail;
 209             s->hw_volume.values[i] =
 210                 (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 211         }
 212     }
 213
 214     return 0;
 215
 216 fail:
 217     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 218     s->get_hw_volume = NULL;
 219     s->set_hw_volume = NULL;
 220     return -1;
 221 }
 222
 223 static int source_set_hw_volume_cb(pa_source *s) {
 224     struct userdata *u = s->userdata;
 225     int err;
 226     pa_volume_t vol;
 227
 228     assert(u && u->mixer_elem);
 229
 230     if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
 231         vol = pa_cvolume_avg(&s->hw_volume) * (u->hw_volume_max - u->hw_volume_min) /
 232             PA_VOLUME_NORM + u->hw_volume_min;
 233         err = snd_mixer_selem_set_capture_volume_all(u->mixer_elem, vol);
 234         if (err < 0)
 235             goto fail;
 236     } else {
 237         int i;
 238
 239         for (i = 0;i < s->hw_volume.channels;i++) {
 240             vol = s->hw_volume.values[i] * (u->hw_volume_max - u->hw_volume_min) /
 241                 PA_VOLUME_NORM + u->hw_volume_min;
 242             err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
 243             if (err < 0)
 244                 goto fail;
 245         }
 246     }
 247
 248     return 0;
 249
 250 fail:
 251     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 252     s->get_hw_volume = NULL;
 253     s->set_hw_volume = NULL;
 254     return -1;
 255 }
 256
 257 static int source_get_hw_mute_cb(pa_source *s) {
 258     struct userdata *u = s->userdata;
 259     int err, sw;
 260
 261     assert(u && u->mixer_elem);
 262
 263     err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
 264     if (err) {
 265         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 266         s->get_hw_mute = NULL;
 267         s->set_hw_mute = NULL;
 268         return -1;
 269     }
 270
 271     s->hw_muted = !sw;
 272
 273     return 0;
 274 }
 275
 276 static int source_set_hw_mute_cb(pa_source *s) {
 277     struct userdata *u = s->userdata;
 278     int err;
 279
 280     assert(u && u->mixer_elem);
 281
 282     err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
 283     if (err) {
 284         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 285         s->get_hw_mute = NULL;
 286         s->set_hw_mute = NULL;
 287         return -1;
 288     }
 289
 290     return 0;
 291 }
 292
 293 int pa__init(pa_core *c, pa_module*m) {
 294     pa_modargs *ma = NULL;
 295     int ret = -1;
 296     struct userdata *u = NULL;
 297     const char *dev;
 298     pa_sample_spec ss;
 299     unsigned periods, fragsize;
 300     snd_pcm_uframes_t period_size;
 301     size_t frame_size;
 302     int err;
 303
 304     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 305         pa_log(__FILE__": failed to parse module arguments");
 306         goto fail;
 307     }
 308
 309     ss = c->default_sample_spec;
 310     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 311         pa_log(__FILE__": failed to parse sample specification");
 312         goto fail;
 313     }
 314     frame_size = pa_frame_size(&ss);
 315
 316     periods = 12;
 317     fragsize = 1024;
 318     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 319         pa_log(__FILE__": failed to parse buffer metrics");
 320         goto fail;
 321     }
 322     period_size = fragsize;
 323
 324     u = pa_xmalloc0(sizeof(struct userdata));
 325     m->userdata = u;
 326     u->module = m;
 327
 328     snd_config_update_free_global();
 329     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) {
 330         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 331         goto fail;
 332     }
 333
 334     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 335         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 336         goto fail;
 337     }
 338
 339     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 340         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 341         goto fail;
 342     }
 343
 344     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 345         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
 346         snd_mixer_close(u->mixer_handle);
 347         u->mixer_handle = NULL;
 348     }
 349
 350     u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL);
 351     assert(u->source);
 352
 353     u->source->userdata = u;
 354     u->source->get_latency = source_get_latency_cb;
 355     if (u->mixer_handle) {
 356         assert(u->mixer_elem);
 357         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 358             u->source->get_hw_volume = source_get_hw_volume_cb;
 359             u->source->set_hw_volume = source_set_hw_volume_cb;
 360             snd_mixer_selem_get_capture_volume_range(
 361                 u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 362         }
 363         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 364             u->source->get_hw_mute = source_get_hw_mute_cb;
 365             u->source->set_hw_mute = source_set_hw_mute_cb;
 366         }
 367     }
 368     pa_source_set_owner(u->source, m);
 369     u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
 370
 371     u->pcm_fdl = pa_alsa_fdlist_new();
 372     assert(u->pcm_fdl);
 373     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 374         pa_log(__FILE__": failed to initialise file descriptor monitoring");
 375         goto fail;
 376     }
 377
 378     if (u->mixer_handle) {
 379         u->mixer_fdl = pa_alsa_fdlist_new();
 380         assert(u->mixer_fdl);
 381         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 382             pa_log(__FILE__": failed to initialise file descriptor monitoring");
 383             goto fail;
 384         }
 385         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 386         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 387     }
 388
 389     u->frame_size = frame_size;
 390     u->fragment_size = period_size;
 391
 392     pa_log(__FILE__": using %u fragments of size %u bytes.", periods, u->fragment_size);
 393
 394     u->memchunk.memblock = NULL;
 395     u->memchunk.index = u->memchunk.length = 0;
 396
 397     snd_pcm_start(u->pcm_handle);
 398
 399     ret = 0;
 400
 401 finish:
 402      if (ma)
 403          pa_modargs_free(ma);
 404
 405     /* Get initial mixer settings */
 406     if (u->source->get_hw_volume)
 407         u->source->get_hw_volume(u->source);
 408     if (u->source->get_hw_mute)
 409         u->source->get_hw_mute(u->source);
 410
 411     return ret;
 412
 413 fail:
 414
 415     if (u)
 416         pa__done(c, m);
 417
 418     goto finish;
 419 }
 420
 421 void pa__done(pa_core *c, pa_module*m) {
 422     struct userdata *u;
 423     assert(c && m);
 424
 425     if (!(u = m->userdata))
 426         return;
 427
 428     if (u->source) {
 429         pa_source_disconnect(u->source);
 430         pa_source_unref(u->source);
 431     }
 432
 433     if (u->pcm_fdl)
 434         pa_alsa_fdlist_free(u->pcm_fdl);
 435     if (u->mixer_fdl)
 436         pa_alsa_fdlist_free(u->mixer_fdl);
 437
 438     if (u->mixer_handle)
 439         snd_mixer_close(u->mixer_handle);
 440
 441     if (u->pcm_handle) {
 442         snd_pcm_drop(u->pcm_handle);
 443         snd_pcm_close(u->pcm_handle);
 444     }
 445
 446     if (u->memchunk.memblock)
 447         pa_memblock_unref(u->memchunk.memblock);
 448
 449     pa_xfree(u);
 450 }
 451