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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30
  31 #ifdef HAVE_SYS_POLL_H
  32 #include <sys/poll.h>
  33 #else
  34 #include "poll.h"
  35 #endif
  36
  37 #include <asoundlib.h>
  38
  39 #include <pulse/xmalloc.h>
  40 #include <pulse/util.h>
  41
  42 #include <pulsecore/core.h>
  43 #include <pulsecore/module.h>
  44 #include <pulsecore/memchunk.h>
  45 #include <pulsecore/sink.h>
  46 #include <pulsecore/modargs.h>
  47 #include <pulsecore/core-util.h>
  48 #include <pulsecore/sample-util.h>
  49 #include <pulsecore/log.h>
  50 #include <pulsecore/macro.h>
  51 #include <pulsecore/thread.h>
  52 #include <pulsecore/core-error.h>
  53 #include <pulsecore/thread-mq.h>
  54
  55 #include "alsa-util.h"
  56 #include "module-alsa-sink-symdef.h"
  57
  58 PA_MODULE_AUTHOR("Lennart Poettering")
  59 PA_MODULE_DESCRIPTION("ALSA Sink")
  60 PA_MODULE_VERSION(PACKAGE_VERSION)
  61 PA_MODULE_USAGE(
  62         "sink_name=<name for the sink> "
  63         "device=<ALSA device> "
  64         "format=<sample format> "
  65         "channels=<number of channels> "
  66         "rate=<sample rate> "
  67         "fragments=<number of fragments> "
  68         "fragment_size=<fragment size> "
  69         "channel_map=<channel map> "
  70         "mmap=<enable memory mapping?>")
  71
  72 #define DEFAULT_DEVICE "default"
  73
  74 #define DEFAULT_NFRAGS 4
  75 #define DEFAULT_FRAGSIZE_MSEC 25
  76
  77 struct userdata {
  78     pa_core *core;
  79     pa_module *module;
  80     pa_sink *sink;
  81     pa_thread *thread;
  82     pa_thread_mq thread_mq;
  83
  84     snd_pcm_t *pcm_handle;
  85
  86     pa_alsa_fdlist *mixer_fdl;
  87     snd_mixer_t *mixer_handle;
  88     snd_mixer_elem_t *mixer_elem;
  89     long hw_volume_max, hw_volume_min;
  90
  91     size_t frame_size, fragment_size, hwbuf_size;
  92     unsigned nfragments;
  93     pa_memchunk memchunk;
  94
  95     char *device_name;
  96
  97     int use_mmap;
  98
  99     int first;
 100
 101     struct pollfd *pollfd;
 102     int n_alsa_fds;
 103 };
 104
 105 enum {
 106     POLLFD_ASYNCQ,
 107     POLLFD_ALSA_BASE
 108 };
 109
 110 static const char* const valid_modargs[] = {
 111     "device",
 112     "sink_name",
 113     "format",
 114     "channels",
 115     "rate",
 116     "fragments",
 117     "fragment_size",
 118     "channel_map",
 119     "mmap",
 120     NULL
 121 };
 122
 123 static int mmap_write(struct userdata *u) {
 124     snd_pcm_sframes_t n;
 125     int err;
 126     const snd_pcm_channel_area_t *areas;
 127     snd_pcm_uframes_t offset, frames;
 128     int work_done = 0;
 129
 130     pa_assert(u);
 131     pa_assert(u->sink);
 132
 133     for (;;) {
 134         pa_memchunk chunk;
 135         void *p;
 136
 137         if ((n = snd_pcm_avail_update(u->pcm_handle)) < 0) {
 138
 139             if (n == -EPIPE) {
 140                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
 141                 u->first = 1;
 142             }
 143
 144             if ((err = snd_pcm_recover(u->pcm_handle, n, 1)) == 0)
 145                 continue;
 146
 147             if (err == -EAGAIN)
 148                 return work_done;
 149
 150             pa_log("snd_pcm_avail_update: %s", snd_strerror(n));
 151             return -1;
 152         }
 153
 154 /*         pa_log("Got request for %i samples", (int) n); */
 155
 156         if (n <= 0)
 157             return work_done;
 158
 159         frames = n;
 160
 161         if ((err = snd_pcm_mmap_begin(u->pcm_handle, &areas, &offset, &frames)) < 0) {
 162
 163             if (err == -EPIPE) {
 164                 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
 165                 u->first = 1;
 166             }
 167
 168             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 169                 continue;
 170
 171             if (err == -EAGAIN)
 172                 return work_done;
 173
 174             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 175             return -1;
 176         }
 177
 178         /* Check these are multiples of 8 bit */
 179         pa_assert((areas[0].first & 7) == 0);
 180         pa_assert((areas[0].step & 7)== 0);
 181
 182         /* We assume a single interleaved memory buffer */
 183         pa_assert((areas[0].first >> 3) == 0);
 184         pa_assert((areas[0].step >> 3) == u->frame_size);
 185
 186         p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
 187
 188         chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, 1);
 189         chunk.length = pa_memblock_get_length(chunk.memblock);
 190         chunk.index = 0;
 191
 192         pa_sink_render_into_full(u->sink, &chunk);
 193
 194         /* FIXME: Maybe we can do something to keep this memory block
 195          * a little bit longer around? */
 196         pa_memblock_unref_fixed(chunk.memblock);
 197
 198         if ((err = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0) {
 199
 200             if (err == -EPIPE) {
 201                 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
 202                 u->first = 1;
 203             }
 204
 205             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 206                 continue;
 207
 208             if (err == -EAGAIN)
 209                 return work_done;
 210
 211             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 212             return -1;
 213         }
 214
 215         work_done = 1;
 216
 217 /*         pa_log("wrote %i samples", (int) frames); */
 218     }
 219 }
 220
 221 static pa_usec_t sink_get_latency(struct userdata *u) {
 222     pa_usec_t r = 0;
 223     snd_pcm_sframes_t frames = 0;
 224     int err;
 225
 226     pa_assert(u);
 227
 228     snd_pcm_avail_update(u->pcm_handle);
 229
 230     if ((err = snd_pcm_delay(u->pcm_handle, &frames)) < 0) {
 231         pa_log("Failed to get delay: %s", snd_strerror(err));
 232         return 0;
 233     }
 234
 235     if (frames > 0)
 236         r = pa_bytes_to_usec(frames * u->frame_size, &u->sink->sample_spec);
 237
 238     if (u->memchunk.memblock)
 239         r += pa_bytes_to_usec(u->memchunk.length, &u->sink->sample_spec);
 240
 241     return r;
 242 }
 243
 244 static int build_pollfd(struct userdata *u) {
 245     int err;
 246
 247     pa_assert(u);
 248     pa_assert(u->pcm_handle);
 249
 250     if ((u->n_alsa_fds = snd_pcm_poll_descriptors_count(u->pcm_handle)) < 0) {
 251         pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(u->n_alsa_fds));
 252         return -1;
 253     }
 254
 255     pa_xfree(u->pollfd);
 256     u->pollfd = pa_xnew0(struct pollfd, POLLFD_ALSA_BASE + u->n_alsa_fds);
 257
 258     u->pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->thread_mq.inq);
 259     u->pollfd[POLLFD_ASYNCQ].events = POLLIN;
 260
 261     if ((err = snd_pcm_poll_descriptors(u->pcm_handle, u->pollfd+POLLFD_ALSA_BASE, u->n_alsa_fds)) < 0) {
 262         pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
 263         return -1;
 264     }
 265
 266     return 0;
 267 }
 268
 269 static int suspend(struct userdata *u) {
 270     pa_assert(u);
 271     pa_assert(u->pcm_handle);
 272
 273     snd_pcm_drain(u->pcm_handle);    /* Let's suspend */
 274     snd_pcm_close(u->pcm_handle);
 275     u->pcm_handle = NULL;
 276
 277     pa_log_debug("Device suspended...");
 278
 279     return 0;
 280 }
 281
 282 static int unsuspend(struct userdata *u) {
 283     pa_sample_spec ss;
 284     int err, b;
 285     unsigned nfrags;
 286     snd_pcm_uframes_t period_size;
 287
 288     pa_assert(u);
 289     pa_assert(!u->pcm_handle);
 290
 291     pa_log_debug("Trying resume...");
 292
 293     snd_config_update_free_global();
 294     if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
 295         pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
 296         goto fail;
 297     }
 298
 299     ss = u->sink->sample_spec;
 300     nfrags = u->nfragments;
 301     period_size = u->fragment_size / u->frame_size;
 302     b = u->use_mmap;
 303
 304     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 305         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 306         goto fail;
 307     }
 308
 309     if (b != u->use_mmap) {
 310         pa_log_warn("Resume failed, couldn't get original access mode.");
 311         goto fail;
 312     }
 313
 314     if (!pa_sample_spec_equal(&ss, &u->sink->sample_spec)) {
 315         pa_log_warn("Resume failed, couldn't restore original sample settings.");
 316         goto fail;
 317     }
 318
 319     if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
 320         pa_log_warn("Resume failed, couldn't restore original fragment settings.");
 321         goto fail;
 322     }
 323
 324     if ((err = pa_alsa_set_sw_params(u->pcm_handle)) < 0) {
 325         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 326         goto fail;
 327     }
 328
 329     if (build_pollfd(u) < 0)
 330         goto fail;
 331
 332     /* FIXME: We need to reload the volume somehow */
 333
 334     u->first = 1;
 335
 336     pa_log_debug("Resumed successfully...");
 337
 338     return 0;
 339
 340 fail:
 341     if (u->pcm_handle) {
 342         snd_pcm_close(u->pcm_handle);
 343         u->pcm_handle = NULL;
 344     }
 345
 346     return -1;
 347 }
 348
 349 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 350     struct userdata *u = PA_SINK(o)->userdata;
 351
 352     switch (code) {
 353
 354         case PA_SINK_MESSAGE_GET_LATENCY: {
 355             pa_usec_t r = 0;
 356
 357             if (u->pcm_handle)
 358                 r = sink_get_latency(u);
 359
 360             *((pa_usec_t*) data) = r;
 361
 362             break;
 363         }
 364
 365         case PA_SINK_MESSAGE_SET_STATE:
 366
 367             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 368
 369                 case PA_SINK_SUSPENDED:
 370                     pa_assert(PA_SINK_OPENED(u->sink->thread_info.state));
 371
 372                     if (suspend(u) < 0)
 373                         return -1;
 374
 375                     break;
 376
 377                 case PA_SINK_IDLE:
 378                 case PA_SINK_RUNNING:
 379
 380                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
 381                         if (unsuspend(u) < 0)
 382                             return -1;
 383                     }
 384
 385                     break;
 386
 387                 case PA_SINK_DISCONNECTED:
 388                     ;
 389             }
 390
 391             break;
 392     }
 393
 394     return pa_sink_process_msg(o, code, data, offset, chunk);
 395 }
 396
 397 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 398     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 399
 400     pa_assert(u);
 401     pa_assert(u->mixer_handle);
 402
 403     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 404         return 0;
 405
 406     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 407         pa_sink_get_volume(u->sink);
 408         pa_sink_get_mute(u->sink);
 409     }
 410
 411     return 0;
 412 }
 413
 414 static int sink_get_volume_cb(pa_sink *s) {
 415     struct userdata *u = s->userdata;
 416     int err;
 417     int i;
 418
 419     pa_assert(u);
 420     pa_assert(u->mixer_elem);
 421
 422     for (i = 0; i < s->sample_spec.channels; i++) {
 423         long set_vol, vol;
 424
 425         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 426
 427         if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, i, &vol)) < 0)
 428             goto fail;
 429
 430         set_vol = (long) roundf(((float) s->volume.values[i] * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 431
 432         /* Try to avoid superfluous volume changes */
 433         if (set_vol != vol)
 434             s->volume.values[i] = (pa_volume_t) roundf(((float) (vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
 435     }
 436
 437     return 0;
 438
 439 fail:
 440     pa_log_error("Unable to read volume: %s", snd_strerror(err));
 441
 442     s->get_volume = NULL;
 443     s->set_volume = NULL;
 444     return -1;
 445 }
 446
 447 static int sink_set_volume_cb(pa_sink *s) {
 448     struct userdata *u = s->userdata;
 449     int err;
 450     int i;
 451
 452     pa_assert(u);
 453     pa_assert(u->mixer_elem);
 454
 455     for (i = 0; i < s->sample_spec.channels; i++) {
 456         long alsa_vol;
 457         pa_volume_t vol;
 458
 459         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 460
 461         vol = s->volume.values[i];
 462
 463         if (vol > PA_VOLUME_NORM)
 464             vol = PA_VOLUME_NORM;
 465
 466         alsa_vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 467
 468         if ((err = snd_mixer_selem_set_playback_volume(u->mixer_elem, i, alsa_vol)) < 0)
 469             goto fail;
 470     }
 471
 472     return 0;
 473
 474 fail:
 475     pa_log_error("Unable to set volume: %s", snd_strerror(err));
 476
 477     s->get_volume = NULL;
 478     s->set_volume = NULL;
 479     return -1;
 480 }
 481
 482 static int sink_get_mute_cb(pa_sink *s) {
 483     struct userdata *u = s->userdata;
 484     int err, sw;
 485
 486     pa_assert(u);
 487     pa_assert(u->mixer_elem);
 488
 489     if ((err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw)) < 0) {
 490         pa_log_error("Unable to get switch: %s", snd_strerror(err));
 491
 492         s->get_mute = NULL;
 493         s->set_mute = NULL;
 494         return -1;
 495     }
 496
 497     s->muted = !sw;
 498
 499     return 0;
 500 }
 501
 502 static int sink_set_mute_cb(pa_sink *s) {
 503     struct userdata *u = s->userdata;
 504     int err;
 505
 506     pa_assert(u);
 507     pa_assert(u->mixer_elem);
 508
 509     if ((err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->muted)) < 0) {
 510         pa_log_error("Unable to set switch: %s", snd_strerror(err));
 511
 512         s->get_mute = NULL;
 513         s->set_mute = NULL;
 514         return -1;
 515     }
 516
 517     return 0;
 518 }
 519
 520 static void thread_func(void *userdata) {
 521
 522     struct userdata *u = userdata;
 523     unsigned short revents = 0;
 524     snd_pcm_status_t *status;
 525     int err;
 526
 527     pa_assert(u);
 528     snd_pcm_status_alloca(&status);
 529
 530     pa_log_debug("Thread starting up");
 531
 532     pa_thread_mq_install(&u->thread_mq);
 533
 534     if (build_pollfd(u) < 0)
 535         goto fail;
 536
 537     for (;;) {
 538         pa_msgobject *object;
 539         int code;
 540         void *data;
 541         pa_memchunk chunk;
 542         int64_t offset;
 543         int r;
 544
 545 /*         pa_log("loop");      */
 546
 547         /* Check whether there is a message for us to process */
 548         if (pa_asyncmsgq_get(u->thread_mq.inq, &object, &code, &data, &offset, &chunk, 0) == 0) {
 549             int ret;
 550
 551 /*             pa_log("processing msg");  */
 552
 553             if (!object && code == PA_MESSAGE_SHUTDOWN) {
 554                 pa_asyncmsgq_done(u->thread_mq.inq, 0);
 555                 goto finish;
 556             }
 557
 558             ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
 559             pa_asyncmsgq_done(u->thread_mq.inq, ret);
 560             continue;
 561         }
 562
 563 /*         pa_log("loop2"); */
 564
 565         /* Render some data and write it to the dsp */
 566
 567         if (PA_SINK_OPENED(u->sink->thread_info.state) && ((revents & POLLOUT) || u->first == 1)) {
 568             int work_done = 0;
 569             pa_assert(u->pcm_handle);
 570
 571             if (u->use_mmap) {
 572
 573                 if ((work_done = mmap_write(u)) < 0)
 574                     goto fail;
 575
 576             } else {
 577
 578                 for (;;) {
 579                     void *p;
 580                     snd_pcm_sframes_t t;
 581                     ssize_t l;
 582
 583                     if ((err = snd_pcm_status(u->pcm_handle, status)) < 0) {
 584                         pa_log("Failed to query DSP status data: %s", snd_strerror(t));
 585                         goto fail;
 586                     }
 587
 588                     if (snd_pcm_status_get_avail_max(status)*u->frame_size >= u->hwbuf_size)
 589                         pa_log_debug("Buffer underrun!");
 590
 591                     l = snd_pcm_status_get_avail(status) * u->frame_size;
 592
 593 /*                     pa_log("%u bytes to write", l); */
 594
 595                     if (l <= 0)
 596                         break;
 597
 598                     if (u->memchunk.length <= 0)
 599                         pa_sink_render(u->sink, l, &u->memchunk);
 600
 601                     pa_assert(u->memchunk.length > 0);
 602
 603                     p = pa_memblock_acquire(u->memchunk.memblock);
 604                     t = snd_pcm_writei(u->pcm_handle, (const uint8_t*) p + u->memchunk.index, u->memchunk.length / u->frame_size);
 605                     pa_memblock_release(u->memchunk.memblock);
 606
 607 /*                     pa_log("wrote %i bytes of %u (%u)", t*u->frame_size, u->memchunk.length, l);   */
 608
 609                     pa_assert(t != 0);
 610
 611                     if (t < 0) {
 612
 613                         if ((t = snd_pcm_recover(u->pcm_handle, t, 1)) == 0)
 614                             continue;
 615
 616                         if (t == -EAGAIN) {
 617                             pa_log_debug("EAGAIN");
 618                             break;
 619                         } else {
 620                             pa_log("Failed to write data to DSP: %s", snd_strerror(t));
 621                             goto fail;
 622                         }
 623                     }
 624
 625                     u->memchunk.index += t * u->frame_size;
 626                     u->memchunk.length -= t * u->frame_size;
 627
 628                     if (u->memchunk.length <= 0) {
 629                         pa_memblock_unref(u->memchunk.memblock);
 630                         pa_memchunk_reset(&u->memchunk);
 631                     }
 632
 633                     work_done = 1;
 634
 635                     if (t * u->frame_size >= (unsigned) l)
 636                         break;
 637                 }
 638             }
 639
 640             revents &= ~POLLOUT;
 641
 642             if (work_done) {
 643
 644                 if (u->first) {
 645                     pa_log_info("Starting playback.");
 646                     snd_pcm_start(u->pcm_handle);
 647                     u->first = 0;
 648                 }
 649
 650                 continue;
 651             }
 652         }
 653
 654         /* Hmm, nothing to do. Let's sleep */
 655         if (pa_asyncmsgq_before_poll(u->thread_mq.inq) < 0)
 656             continue;
 657
 658 /*         pa_log("polling for %i", POLLFD_ALSA_BASE + (PA_SINK_OPENED(u->sink->thread_info.state) ? u->n_alsa_fds : 0));    */
 659         r = poll(u->pollfd, POLLFD_ALSA_BASE + (PA_SINK_OPENED(u->sink->thread_info.state) ? u->n_alsa_fds : 0), -1);
 660 /*         pa_log("poll end"); */
 661
 662         pa_asyncmsgq_after_poll(u->thread_mq.inq);
 663
 664         if (r < 0) {
 665             if (errno == EINTR) {
 666                 u->pollfd[POLLFD_ASYNCQ].revents = 0;
 667                 revents = 0;
 668                 continue;
 669             }
 670
 671             pa_log("poll() failed: %s", pa_cstrerror(errno));
 672             goto fail;
 673         }
 674
 675         pa_assert(r > 0);
 676
 677         if (PA_SINK_OPENED(u->sink->thread_info.state)) {
 678             if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, u->pollfd + POLLFD_ALSA_BASE, u->n_alsa_fds, &revents)) < 0) {
 679                 pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
 680                 goto fail;
 681             }
 682
 683             if (revents & (POLLERR|POLLNVAL|POLLHUP)) {
 684                 if (revents & POLLERR)
 685                     pa_log_warn("Got POLLERR from ALSA");
 686                 if (revents & POLLNVAL)
 687                     pa_log_warn("Got POLLNVAL from ALSA");
 688                 if (revents & POLLHUP)
 689                     pa_log_warn("Got POLLHUP from ALSA");
 690
 691                 goto fail;
 692             }
 693 /*             pa_log("got alsa event"); */
 694         } else
 695             revents = 0;
 696
 697         pa_assert((u->pollfd[POLLFD_ASYNCQ].revents & ~POLLIN) == 0);
 698     }
 699
 700 fail:
 701     /* We have to continue processing messages until we receive the
 702      * SHUTDOWN message */
 703     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 704     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 705
 706 finish:
 707     pa_log_debug("Thread shutting down");
 708 }
 709
 710 int pa__init(pa_module*m) {
 711
 712     pa_modargs *ma = NULL;
 713     int ret = -1;
 714     struct userdata *u = NULL;
 715     const char *dev;
 716     pa_sample_spec ss;
 717     pa_channel_map map;
 718     uint32_t nfrags, frag_size;
 719     snd_pcm_uframes_t period_size;
 720     size_t frame_size;
 721     snd_pcm_info_t *pcm_info = NULL;
 722     int err;
 723     char *t;
 724     const char *name;
 725     char *name_buf = NULL;
 726     int namereg_fail;
 727     int use_mmap = 1, b;
 728
 729     pa_assert(m);
 730
 731     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 732         pa_log("Failed to parse module arguments");
 733         goto fail;
 734     }
 735
 736     ss = m->core->default_sample_spec;
 737     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
 738         pa_log("Failed to parse sample specification and channel map");
 739         goto fail;
 740     }
 741
 742     frame_size = pa_frame_size(&ss);
 743
 744     nfrags = DEFAULT_NFRAGS;
 745     frag_size = pa_usec_to_bytes(DEFAULT_FRAGSIZE_MSEC*1000, &ss);
 746     if (frag_size <= 0)
 747         frag_size = frame_size;
 748
 749     if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0) {
 750         pa_log("Failed to parse buffer metrics");
 751         goto fail;
 752     }
 753     period_size = frag_size/frame_size;
 754
 755     if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
 756         pa_log("Failed to parse mmap argument.");
 757         goto fail;
 758     }
 759
 760     u = pa_xnew0(struct userdata, 1);
 761     u->core = m->core;
 762     u->module = m;
 763     m->userdata = u;
 764     u->use_mmap = use_mmap;
 765     u->first = 1;
 766     u->n_alsa_fds = 0;
 767     u->pollfd = NULL;
 768     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
 769
 770     snd_config_update_free_global();
 771     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) {
 772         pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
 773         goto fail;
 774     }
 775
 776     u->device_name = pa_xstrdup(dev);
 777
 778     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 779         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 780         pa_log("Error fetching PCM info: %s", snd_strerror(err));
 781         goto fail;
 782     }
 783
 784     b = use_mmap;
 785     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 786         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 787         goto fail;
 788     }
 789
 790     if (use_mmap && !b) {
 791         pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
 792         u->use_mmap = use_mmap = b;
 793     }
 794
 795     if (u->use_mmap)
 796         pa_log_info("Successfully enabled mmap() mode.");
 797
 798     if ((err = pa_alsa_set_sw_params(u->pcm_handle)) < 0) {
 799         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 800         goto fail;
 801     }
 802
 803     /* ALSA might tweak the sample spec, so recalculate the frame size */
 804     frame_size = pa_frame_size(&ss);
 805
 806     if (ss.channels != map.channels)
 807         /* Seems ALSA didn't like the channel number, so let's fix the channel map */
 808         pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
 809
 810     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
 811         pa_log_warn("Error opening mixer: %s", snd_strerror(err));
 812     else {
 813
 814         if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 815             !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Master", "PCM"))) {
 816
 817             snd_mixer_close(u->mixer_handle);
 818             u->mixer_handle = NULL;
 819         }
 820     }
 821
 822     if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
 823         namereg_fail = 1;
 824     else {
 825         name = name_buf = pa_sprintf_malloc("alsa_output.%s", dev);
 826         namereg_fail = 0;
 827     }
 828
 829     u->sink = pa_sink_new(m->core, __FILE__, name, namereg_fail, &ss, &map);
 830     pa_xfree(name_buf);
 831
 832     if (!u->sink) {
 833         pa_log("Failed to create sink object");
 834         goto fail;
 835     }
 836
 837     u->sink->parent.process_msg = sink_process_msg;
 838     u->sink->userdata = u;
 839
 840     pa_sink_set_module(u->sink, m);
 841     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 842     pa_sink_set_description(u->sink, t = pa_sprintf_malloc(
 843                                     "ALSA PCM on %s (%s)",
 844                                     dev,
 845                                     snd_pcm_info_get_name(pcm_info)));
 846     pa_xfree(t);
 847
 848     u->sink->is_hardware = 1;
 849
 850     u->frame_size = frame_size;
 851     u->fragment_size = frag_size = period_size * frame_size;
 852     u->nfragments = nfrags;
 853     u->hwbuf_size = u->fragment_size * nfrags;
 854
 855     pa_log_info("Using %u fragments of size %lu bytes.", nfrags, (long unsigned) u->fragment_size);
 856
 857     pa_memchunk_reset(&u->memchunk);
 858
 859     if (u->mixer_handle) {
 860         /* Initialize mixer code */
 861
 862         pa_assert(u->mixer_elem);
 863
 864         if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
 865             int i;
 866
 867             for (i = 0;i < ss.channels; i++) {
 868                 if (!snd_mixer_selem_has_playback_channel(u->mixer_elem, i))
 869                     break;
 870             }
 871
 872             if (i == ss.channels) {
 873                 u->sink->get_volume = sink_get_volume_cb;
 874                 u->sink->set_volume = sink_set_volume_cb;
 875                 snd_mixer_selem_get_playback_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 876             }
 877         }
 878
 879         if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
 880             u->sink->get_mute = sink_get_mute_cb;
 881             u->sink->set_mute = sink_set_mute_cb;
 882         }
 883
 884         u->mixer_fdl = pa_alsa_fdlist_new();
 885
 886         if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, m->core->mainloop) < 0) {
 887             pa_log("failed to initialise file descriptor monitoring");
 888             goto fail;
 889         }
 890
 891         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 892         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 893     } else
 894         u->mixer_fdl = NULL;
 895
 896     if (!(u->thread = pa_thread_new(thread_func, u))) {
 897         pa_log("Failed to create thread.");
 898         goto fail;
 899     }
 900
 901     /* Get initial mixer settings */
 902     if (u->sink->get_volume)
 903         u->sink->get_volume(u->sink);
 904     if (u->sink->get_mute)
 905         u->sink->get_mute(u->sink);
 906
 907     ret = 0;
 908
 909 finish:
 910
 911      if (ma)
 912          pa_modargs_free(ma);
 913
 914      if (pcm_info)
 915          snd_pcm_info_free(pcm_info);
 916
 917     return ret;
 918
 919 fail:
 920
 921     if (u)
 922         pa__done(m);
 923
 924     goto finish;
 925 }
 926
 927 void pa__done(pa_module*m) {
 928     struct userdata *u;
 929
 930     pa_assert(m);
 931
 932     if (!(u = m->userdata))
 933         return;
 934
 935     if (u->sink)
 936         pa_sink_disconnect(u->sink);
 937
 938     if (u->thread) {
 939         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 940         pa_thread_free(u->thread);
 941     }
 942
 943     pa_thread_mq_done(&u->thread_mq);
 944
 945     if (u->sink)
 946         pa_sink_unref(u->sink);
 947
 948     if (u->memchunk.memblock)
 949         pa_memblock_unref(u->memchunk.memblock);
 950
 951     if (u->mixer_fdl)
 952         pa_alsa_fdlist_free(u->mixer_fdl);
 953
 954     if (u->mixer_handle)
 955         snd_mixer_close(u->mixer_handle);
 956
 957     if (u->pcm_handle) {
 958         snd_pcm_drop(u->pcm_handle);
 959         snd_pcm_close(u->pcm_handle);
 960     }
 961
 962     pa_xfree(u->pollfd);
 963     pa_xfree(u->device_name);
 964     pa_xfree(u);
 965
 966     snd_config_update_free_global();
 967 }
 968