code.delx.au - pulseaudio/blob - src/modules/module-alsa-sink.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/memchunk.h>
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/sample-util.h>
  46 #include <pulsecore/log.h>
  47
  48 #include "alsa-util.h"
  49 #include "module-alsa-sink-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering")
  52 PA_MODULE_DESCRIPTION("ALSA Sink")
  53 PA_MODULE_VERSION(PACKAGE_VERSION)
  54 PA_MODULE_USAGE(
  55         "sink_name=<name for the sink> "
  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_sink *sink;
  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, silence;
  75     pa_module *module;
  76 };
  77
  78 static const char* const valid_modargs[] = {
  79     "device",
  80     "sink_name",
  81     "format",
  82     "channels",
  83     "rate",
  84     "fragments",
  85     "fragment_size",
  86     "channel_map",
  87     NULL
  88 };
  89
  90 #define DEFAULT_DEVICE "default"
  91
  92 static void update_usage(struct userdata *u) {
  93     pa_module_set_used(u->module, u->sink ? pa_sink_used_by(u->sink) : 0);
  94 }
  95
  96 static void clear_up(struct userdata *u) {
  97     assert(u);
  98
  99     if (u->sink) {
 100         pa_sink_disconnect(u->sink);
 101         pa_sink_unref(u->sink);
 102         u->sink = NULL;
 103     }
 104
 105     if (u->pcm_fdl)
 106         pa_alsa_fdlist_free(u->pcm_fdl);
 107     if (u->mixer_fdl)
 108         pa_alsa_fdlist_free(u->mixer_fdl);
 109
 110     u->pcm_fdl = u->mixer_fdl = NULL;
 111
 112     if (u->mixer_handle) {
 113         snd_mixer_close(u->mixer_handle);
 114         u->mixer_handle = NULL;
 115     }
 116
 117     if (u->pcm_handle) {
 118         snd_pcm_drop(u->pcm_handle);
 119         snd_pcm_close(u->pcm_handle);
 120         u->pcm_handle = NULL;
 121     }
 122 }
 123
 124 static int xrun_recovery(struct userdata *u) {
 125     int ret;
 126     assert(u);
 127
 128     pa_log_info("*** ALSA-XRUN (playback) ***");
 129
 130     if ((ret = snd_pcm_prepare(u->pcm_handle)) < 0) {
 131         pa_log("snd_pcm_prepare() failed: %s", snd_strerror(-ret));
 132
 133         clear_up(u);
 134         pa_module_unload_request(u->module);
 135         return -1;
 136     }
 137
 138     return ret;
 139 }
 140
 141 static void do_write(struct userdata *u) {
 142     assert(u);
 143
 144     update_usage(u);
 145
 146     for (;;) {
 147         pa_memchunk *memchunk = NULL;
 148         snd_pcm_sframes_t frames;
 149
 150         if (u->memchunk.memblock)
 151             memchunk = &u->memchunk;
 152         else {
 153             if (pa_sink_render(u->sink, u->fragment_size, &u->memchunk) < 0)
 154                 memchunk = &u->silence;
 155             else
 156                 memchunk = &u->memchunk;
 157         }
 158
 159         assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
 160
 161         if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
 162             if (frames == -EAGAIN)
 163                 return;
 164
 165             if (frames == -EPIPE) {
 166                 if (xrun_recovery(u) < 0)
 167                     return;
 168
 169                 continue;
 170             }
 171
 172             pa_log("snd_pcm_writei() failed: %s", snd_strerror(-frames));
 173
 174             clear_up(u);
 175             pa_module_unload_request(u->module);
 176             return;
 177         }
 178
 179         if (memchunk == &u->memchunk) {
 180             size_t l = frames * u->frame_size;
 181             memchunk->index += l;
 182             memchunk->length -= l;
 183
 184             if (memchunk->length == 0) {
 185                 pa_memblock_unref(memchunk->memblock);
 186                 memchunk->memblock = NULL;
 187                 memchunk->index = memchunk->length = 0;
 188             }
 189         }
 190
 191         break;
 192     }
 193 }
 194
 195 static void fdl_callback(void *userdata) {
 196     struct userdata *u = userdata;
 197     assert(u);
 198
 199     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 200         if (xrun_recovery(u) < 0)
 201             return;
 202
 203     do_write(u);
 204 }
 205
 206 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 207     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 208
 209     assert(u && u->mixer_handle);
 210
 211     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 212         return 0;
 213
 214     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 215         if (u->sink->get_hw_volume)
 216             u->sink->get_hw_volume(u->sink);
 217         if (u->sink->get_hw_mute)
 218             u->sink->get_hw_mute(u->sink);
 219         pa_subscription_post(u->sink->core,
 220             PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE,
 221             u->sink->index);
 222     }
 223
 224     return 0;
 225 }
 226
 227 static pa_usec_t sink_get_latency_cb(pa_sink *s) {
 228     pa_usec_t r = 0;
 229     struct userdata *u = s->userdata;
 230     snd_pcm_sframes_t frames;
 231     int err;
 232
 233     assert(s && u && u->sink);
 234
 235     if ((err = snd_pcm_delay(u->pcm_handle, &frames)) < 0) {
 236         pa_log("failed to get delay: %s", snd_strerror(err));
 237         s->get_latency = NULL;
 238         return 0;
 239     }
 240
 241     if (frames < 0)
 242         frames = 0;
 243
 244     r += pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 245
 246     if (u->memchunk.memblock)
 247         r += pa_bytes_to_usec(u->memchunk.length, &s->sample_spec);
 248
 249     return r;
 250 }
 251
 252 static int sink_get_hw_volume_cb(pa_sink *s) {
 253     struct userdata *u = s->userdata;
 254     int err;
 255     int i;
 256
 257     assert(u);
 258     assert(u->mixer_elem);
 259
 260     for (i = 0; i < s->hw_volume.channels; i++) {
 261         long set_vol, vol;
 262
 263         assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 264
 265         if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, i, &vol)) < 0)
 266             goto fail;
 267
 268         set_vol = (long) roundf(((float) s->hw_volume.values[i] * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 269
 270         /* Try to avoid superfluous volume changes */
 271         if (set_vol != vol)
 272             s->hw_volume.values[i] = (pa_volume_t) roundf(((float) (vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
 273     }
 274
 275     return 0;
 276
 277 fail:
 278     pa_log_error("Unable to read volume: %s", snd_strerror(err));
 279     s->get_hw_volume = NULL;
 280     s->set_hw_volume = NULL;
 281     return -1;
 282 }
 283
 284 static int sink_set_hw_volume_cb(pa_sink *s) {
 285     struct userdata *u = s->userdata;
 286     int err;
 287     int i;
 288     pa_volume_t vol;
 289
 290     assert(u);
 291     assert(u->mixer_elem);
 292
 293     for (i = 0; i < s->hw_volume.channels; i++) {
 294         long alsa_vol;
 295
 296         assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 297
 298         vol = s->hw_volume.values[i];
 299
 300         if (vol > PA_VOLUME_NORM)
 301             vol = PA_VOLUME_NORM;
 302
 303         alsa_vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 304
 305         if ((err = snd_mixer_selem_set_playback_volume(u->mixer_elem, i, alsa_vol)) < 0)
 306             goto fail;
 307     }
 308
 309     return 0;
 310
 311 fail:
 312     pa_log_error("Unable to set volume: %s", snd_strerror(err));
 313     s->get_hw_volume = NULL;
 314     s->set_hw_volume = NULL;
 315     return -1;
 316 }
 317
 318 static int sink_get_hw_mute_cb(pa_sink *s) {
 319     struct userdata *u = s->userdata;
 320     int err, sw;
 321
 322     assert(u && u->mixer_elem);
 323
 324     err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw);
 325     if (err) {
 326         pa_log_error("Unable to get switch: %s", snd_strerror(err));
 327         s->get_hw_mute = NULL;
 328         s->set_hw_mute = NULL;
 329         return -1;
 330     }
 331
 332     s->hw_muted = !sw;
 333
 334     return 0;
 335 }
 336
 337 static int sink_set_hw_mute_cb(pa_sink *s) {
 338     struct userdata *u = s->userdata;
 339     int err;
 340
 341     assert(u && u->mixer_elem);
 342
 343     err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->hw_muted);
 344     if (err) {
 345         pa_log_error("Unable to set switch: %s", snd_strerror(err));
 346         s->get_hw_mute = NULL;
 347         s->set_hw_mute = NULL;
 348         return -1;
 349     }
 350
 351     return 0;
 352 }
 353
 354 int pa__init(pa_core *c, pa_module*m) {
 355     pa_modargs *ma = NULL;
 356     int ret = -1;
 357     struct userdata *u = NULL;
 358     const char *dev;
 359     pa_sample_spec ss;
 360     pa_channel_map map;
 361     uint32_t periods, fragsize;
 362     snd_pcm_uframes_t period_size;
 363     size_t frame_size;
 364     snd_pcm_info_t *pcm_info = NULL;
 365     int err;
 366     char *t;
 367     const char *name;
 368     char *name_buf = NULL;
 369     int namereg_fail;
 370
 371     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 372         pa_log("failed to parse module arguments");
 373         goto fail;
 374     }
 375
 376     ss = c->default_sample_spec;
 377     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
 378         pa_log("failed to parse sample specification and channel map");
 379         goto fail;
 380     }
 381
 382     frame_size = pa_frame_size(&ss);
 383
 384     /* Fix latency to 100ms */
 385     periods = 8;
 386     fragsize = pa_bytes_per_second(&ss)/128;
 387
 388     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 389         pa_log("failed to parse buffer metrics");
 390         goto fail;
 391     }
 392     period_size = fragsize/frame_size;
 393
 394     u = pa_xnew0(struct userdata, 1);
 395     m->userdata = u;
 396     u->module = m;
 397
 398     snd_config_update_free_global();
 399     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) {
 400         pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
 401         goto fail;
 402     }
 403
 404     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 405         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 406         pa_log("Error fetching PCM info: %s", snd_strerror(err));
 407         goto fail;
 408     }
 409
 410     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 411         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 412         goto fail;
 413     }
 414
 415     if (ss.channels != map.channels)
 416         /* Seems ALSA didn't like the channel number, so let's fix the channel map */
 417         pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
 418
 419     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 420         pa_log("Error opening mixer: %s", snd_strerror(err));
 421         goto fail;
 422     }
 423
 424     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 425         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "PCM", "Master"))) {
 426         snd_mixer_close(u->mixer_handle);
 427         u->mixer_handle = NULL;
 428     }
 429
 430     if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
 431         namereg_fail = 1;
 432     else {
 433         name = name_buf = pa_sprintf_malloc("alsa_output.%s", dev);
 434         namereg_fail = 0;
 435     }
 436
 437     if (!(u->sink = pa_sink_new(c, __FILE__, name, namereg_fail, &ss, &map))) {
 438         pa_log("Failed to create sink object");
 439         goto fail;
 440     }
 441
 442     u->sink->is_hardware = 1;
 443     u->sink->get_latency = sink_get_latency_cb;
 444     if (u->mixer_handle) {
 445         assert(u->mixer_elem);
 446         if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
 447             int i;
 448
 449             for (i = 0;i < ss.channels;i++) {
 450                 if (!snd_mixer_selem_has_playback_channel(u->mixer_elem, i))
 451                     break;
 452             }
 453
 454             if (i == ss.channels) {
 455                 u->sink->get_hw_volume = sink_get_hw_volume_cb;
 456                 u->sink->set_hw_volume = sink_set_hw_volume_cb;
 457                 snd_mixer_selem_get_playback_volume_range(
 458                     u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 459             }
 460         }
 461         if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
 462             u->sink->get_hw_mute = sink_get_hw_mute_cb;
 463             u->sink->set_hw_mute = sink_set_hw_mute_cb;
 464         }
 465     }
 466     u->sink->userdata = u;
 467     pa_sink_set_owner(u->sink, m);
 468     pa_sink_set_description(u->sink, t = pa_sprintf_malloc("ALSA PCM on %s (%s)", dev, snd_pcm_info_get_name(pcm_info)));
 469     pa_xfree(t);
 470
 471     u->pcm_fdl = pa_alsa_fdlist_new();
 472     assert(u->pcm_fdl);
 473     if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
 474         pa_log("failed to initialise file descriptor monitoring");
 475         goto fail;
 476     }
 477
 478     if (u->mixer_handle) {
 479         u->mixer_fdl = pa_alsa_fdlist_new();
 480         assert(u->mixer_fdl);
 481         if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 482             pa_log("failed to initialise file descriptor monitoring");
 483             goto fail;
 484         }
 485         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 486         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 487     } else
 488         u->mixer_fdl = NULL;
 489
 490     u->frame_size = frame_size;
 491     u->fragment_size = period_size * frame_size;
 492
 493     pa_log_info("using %u fragments of size %lu bytes.", periods, (long unsigned)u->fragment_size);
 494
 495     u->silence.memblock = pa_memblock_new(c->mempool, u->silence.length = u->fragment_size);
 496     assert(u->silence.memblock);
 497     pa_silence_memblock(u->silence.memblock, &ss);
 498     u->silence.index = 0;
 499
 500     u->memchunk.memblock = NULL;
 501     u->memchunk.index = u->memchunk.length = 0;
 502
 503     ret = 0;
 504
 505     /* Get initial mixer settings */
 506     if (u->sink->get_hw_volume)
 507         u->sink->get_hw_volume(u->sink);
 508     if (u->sink->get_hw_mute)
 509         u->sink->get_hw_mute(u->sink);
 510
 511 finish:
 512
 513     pa_xfree(name_buf);
 514
 515      if (ma)
 516          pa_modargs_free(ma);
 517
 518     if (pcm_info)
 519         snd_pcm_info_free(pcm_info);
 520
 521     return ret;
 522
 523 fail:
 524
 525     if (u)
 526         pa__done(c, m);
 527
 528     goto finish;
 529 }
 530
 531 void pa__done(pa_core *c, pa_module*m) {
 532     struct userdata *u;
 533     assert(c && m);
 534
 535     if (!(u = m->userdata))
 536         return;
 537
 538     clear_up(u);
 539
 540     if (u->memchunk.memblock)
 541         pa_memblock_unref(u->memchunk.memblock);
 542     if (u->silence.memblock)
 543         pa_memblock_unref(u->silence.memblock);
 544
 545     pa_xfree(u);
 546 }
 547