code.delx.au - pulseaudio/blob - src/modules/module-alsa-sink.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-sink-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("ALSA Sink")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53 PA_MODULE_USAGE(
  54         "sink_name=<name for the sink> "
  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_sink *sink;
  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, silence;
  74     pa_module *module;
  75 };
  76
  77 static const char* const valid_modargs[] = {
  78     "device",
  79     "sink_name",
  80     "format",
  81     "channels",
  82     "rate",
  83     "fragments",
  84     "fragment_size",
  85     "channel_map",
  86     NULL
  87 };
  88
  89 #define DEFAULT_SINK_NAME "alsa_output"
  90 #define DEFAULT_DEVICE "default"
  91
  92 static void update_usage(struct userdata *u) {
  93    pa_module_set_used(u->module,
  94                       (u->sink ? pa_idxset_size(u->sink->inputs) : 0) +
  95                       (u->sink ? pa_idxset_size(u->sink->monitor_source->outputs) : 0));
  96 }
  97
  98 static void xrun_recovery(struct userdata *u) {
  99     assert(u);
 100
 101     pa_log(__FILE__": *** ALSA-XRUN (playback) ***");
 102
 103     if (snd_pcm_prepare(u->pcm_handle) < 0)
 104         pa_log(__FILE__": snd_pcm_prepare() failed");
 105 }
 106
 107 static void do_write(struct userdata *u) {
 108     assert(u);
 109
 110     update_usage(u);
 111
 112     for (;;) {
 113         pa_memchunk *memchunk = NULL;
 114         snd_pcm_sframes_t frames;
 115
 116         if (u->memchunk.memblock)
 117             memchunk = &u->memchunk;
 118         else {
 119             if (pa_sink_render(u->sink, u->fragment_size, &u->memchunk) < 0)
 120                 memchunk = &u->silence;
 121             else
 122                 memchunk = &u->memchunk;
 123         }
 124
 125         assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
 126
 127         if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) memchunk->memblock->data + memchunk->index, 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_writei() failed: %s", snd_strerror(frames));
 137             return;
 138         }
 139
 140         if (memchunk == &u->memchunk) {
 141             size_t l = frames * u->frame_size;
 142             memchunk->index += l;
 143             memchunk->length -= l;
 144
 145             if (memchunk->length == 0) {
 146                 pa_memblock_unref(memchunk->memblock);
 147                 memchunk->memblock = NULL;
 148                 memchunk->index = memchunk->length = 0;
 149             }
 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_write(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_VALUE) {
 172         if (u->sink->get_hw_volume)
 173             u->sink->get_hw_volume(u->sink);
 174         if (u->sink->get_hw_mute)
 175             u->sink->get_hw_mute(u->sink);
 176         pa_subscription_post(u->sink->core,
 177             PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE,
 178             u->sink->index);
 179     }
 180
 181     return 0;
 182 }
 183
 184 static pa_usec_t sink_get_latency_cb(pa_sink *s) {
 185     pa_usec_t r = 0;
 186     struct userdata *u = s->userdata;
 187     snd_pcm_sframes_t frames;
 188     int err;
 189
 190     assert(s && u && u->sink);
 191
 192     if ((err = snd_pcm_delay(u->pcm_handle, &frames)) < 0) {
 193         pa_log(__FILE__": failed to get delay: %s", snd_strerror(err));
 194         s->get_latency = NULL;
 195         return 0;
 196     }
 197
 198     if (frames < 0)
 199         frames = 0;
 200
 201     r += pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 202
 203     if (u->memchunk.memblock)
 204         r += pa_bytes_to_usec(u->memchunk.length, &s->sample_spec);
 205
 206     return r;
 207 }
 208
 209 static int sink_get_hw_volume_cb(pa_sink *s) {
 210     struct userdata *u = s->userdata;
 211     long vol;
 212     int err;
 213     int i;
 214
 215     assert(u && u->mixer_elem);
 216
 217     for (i = 0;i < s->hw_volume.channels;i++) {
 218         assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 219
 220         err = snd_mixer_selem_get_playback_volume(u->mixer_elem, i, &vol);
 221         if (err < 0)
 222             goto fail;
 223         s->hw_volume.values[i] =
 224             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 225     }
 226
 227     return 0;
 228
 229 fail:
 230     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 231     s->get_hw_volume = NULL;
 232     s->set_hw_volume = NULL;
 233     return -1;
 234 }
 235
 236 static int sink_set_hw_volume_cb(pa_sink *s) {
 237     struct userdata *u = s->userdata;
 238     int err;
 239     int i;
 240     pa_volume_t vol;
 241
 242     assert(u && u->mixer_elem);
 243
 244     for (i = 0;i < s->hw_volume.channels;i++) {
 245         assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 246
 247         vol = s->hw_volume.values[i];
 248
 249         if (vol > PA_VOLUME_NORM)
 250             vol = PA_VOLUME_NORM;
 251
 252         vol = (vol * (u->hw_volume_max - u->hw_volume_min)) /
 253             PA_VOLUME_NORM + u->hw_volume_min;
 254
 255         err = snd_mixer_selem_set_playback_volume(u->mixer_elem, i, vol);
 256         if (err < 0)
 257             goto fail;
 258     }
 259
 260     return 0;
 261
 262 fail:
 263     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 264     s->get_hw_volume = NULL;
 265     s->set_hw_volume = NULL;
 266     return -1;
 267 }
 268
 269 static int sink_get_hw_mute_cb(pa_sink *s) {
 270     struct userdata *u = s->userdata;
 271     int err, sw;
 272
 273     assert(u && u->mixer_elem);
 274
 275     err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw);
 276     if (err) {
 277         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 278         s->get_hw_mute = NULL;
 279         s->set_hw_mute = NULL;
 280         return -1;
 281     }
 282
 283     s->hw_muted = !sw;
 284
 285     return 0;
 286 }
 287
 288 static int sink_set_hw_mute_cb(pa_sink *s) {
 289     struct userdata *u = s->userdata;
 290     int err;
 291
 292     assert(u && u->mixer_elem);
 293
 294     err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->hw_muted);
 295     if (err) {
 296         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 297         s->get_hw_mute = NULL;
 298         s->set_hw_mute = NULL;
 299         return -1;
 300     }
 301
 302     return 0;
 303 }
 304
 305 int pa__init(pa_core *c, pa_module*m) {
 306     pa_modargs *ma = NULL;
 307     int ret = -1;
 308     struct userdata *u = NULL;
 309     const char *dev;
 310     pa_sample_spec ss;
 311     pa_channel_map map;
 312     uint32_t periods, fragsize;
 313     snd_pcm_uframes_t period_size;
 314     size_t frame_size;
 315     snd_pcm_info_t *pcm_info = NULL;
 316     int err;
 317
 318     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 319         pa_log(__FILE__": failed to parse module arguments");
 320         goto fail;
 321     }
 322
 323     ss = c->default_sample_spec;
 324     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map) < 0) {
 325         pa_log(__FILE__": failed to parse sample specification");
 326         goto fail;
 327     }
 328     frame_size = pa_frame_size(&ss);
 329
 330     periods = 8;
 331     fragsize = 1024;
 332     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 333         pa_log(__FILE__": failed to parse buffer metrics");
 334         goto fail;
 335     }
 336     period_size = fragsize;
 337
 338     u = pa_xmalloc0(sizeof(struct userdata));
 339     m->userdata = u;
 340     u->module = m;
 341
 342     snd_config_update_free_global();
 343     if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
 344         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 345         goto fail;
 346     }
 347
 348     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 349         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 350         pa_log(__FILE__": Error fetching PCM info: %s", snd_strerror(err));
 351         goto fail;
 352     }
 353
 354     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 355         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 356         goto fail;
 357     }
 358
 359     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 360         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 361         goto fail;
 362     }
 363
 364     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 365         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "PCM"))) {
 366         snd_mixer_close(u->mixer_handle);
 367         u->mixer_handle = NULL;
 368     }
 369
 370     u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map);
 371     assert(u->sink);
 372
 373     u->sink->get_latency = sink_get_latency_cb;
 374     if (u->mixer_handle) {
 375         assert(u->mixer_elem);
 376         if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
 377             int i;
 378
 379             for (i = 0;i < ss.channels;i++) {
 380                 if (!snd_mixer_selem_has_playback_channel(u->mixer_elem, i))
 381                     break;
 382             }
 383
 384             if (i == ss.channels) {
 385                 u->sink->get_hw_volume = sink_get_hw_volume_cb;
 386                 u->sink->set_hw_volume = sink_set_hw_volume_cb;
 387                 snd_mixer_selem_get_playback_volume_range(
 388                     u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 389             }
 390         }
 391         if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
 392             u->sink->get_hw_mute = sink_get_hw_mute_cb;
 393             u->sink->set_hw_mute = sink_set_hw_mute_cb;
 394         }
 395     }
 396     u->sink->userdata = u;
 397     pa_sink_set_owner(u->sink, m);
 398     u->sink->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s' (%s)", dev, snd_pcm_info_get_name(pcm_info));
 399
 400     u->pcm_fdl = pa_alsa_fdlist_new();
 401     assert(u->pcm_fdl);
 402     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 403         pa_log(__FILE__": failed to initialise file descriptor monitoring");
 404         goto fail;
 405     }
 406
 407     if (u->mixer_handle) {
 408         u->mixer_fdl = pa_alsa_fdlist_new();
 409         assert(u->mixer_fdl);
 410         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 411             pa_log(__FILE__": failed to initialise file descriptor monitoring");
 412             goto fail;
 413         }
 414         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 415         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 416     }
 417
 418     u->frame_size = frame_size;
 419     u->fragment_size = period_size;
 420
 421     pa_log_info(__FILE__": using %u fragments of size %lu bytes.", periods, (long unsigned)u->fragment_size);
 422
 423     u->silence.memblock = pa_memblock_new(u->silence.length = u->fragment_size, c->memblock_stat);
 424     assert(u->silence.memblock);
 425     pa_silence_memblock(u->silence.memblock, &ss);
 426     u->silence.index = 0;
 427
 428     u->memchunk.memblock = NULL;
 429     u->memchunk.index = u->memchunk.length = 0;
 430
 431     ret = 0;
 432
 433     /* Get initial mixer settings */
 434     if (u->sink->get_hw_volume)
 435         u->sink->get_hw_volume(u->sink);
 436     if (u->sink->get_hw_mute)
 437         u->sink->get_hw_mute(u->sink);
 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->sink) {
 464         pa_sink_disconnect(u->sink);
 465         pa_sink_unref(u->sink);
 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     if (u->silence.memblock)
 484         pa_memblock_unref(u->silence.memblock);
 485
 486     pa_xfree(u);
 487 }
 488