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