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 struct userdata {
  75     pa_core *core;
  76     pa_module *module;
  77     pa_sink *sink;
  78     pa_thread *thread;
  79     pa_thread_mq thread_mq;
  80
  81     snd_pcm_t *pcm_handle;
  82
  83     pa_alsa_fdlist *mixer_fdl;
  84     snd_mixer_t *mixer_handle;
  85     snd_mixer_elem_t *mixer_elem;
  86     long hw_volume_max, hw_volume_min;
  87
  88     size_t frame_size, fragment_size, hwbuf_size;
  89     unsigned nfragments;
  90     pa_memchunk memchunk;
  91
  92     char *device_name;
  93
  94     int use_mmap;
  95
  96     int first;
  97
  98     struct pollfd *pollfd;
  99     int n_alsa_fds;
 100 };
 101
 102 enum {
 103     POLLFD_ASYNCQ,
 104     POLLFD_ALSA_BASE
 105 };
 106
 107 static const char* const valid_modargs[] = {
 108     "device",
 109     "sink_name",
 110     "format",
 111     "channels",
 112     "rate",
 113     "fragments",
 114     "fragment_size",
 115     "channel_map",
 116     "mmap",
 117     NULL
 118 };
 119
 120 static int mmap_write(struct userdata *u) {
 121     snd_pcm_sframes_t n;
 122     int err;
 123     const snd_pcm_channel_area_t *areas;
 124     snd_pcm_uframes_t offset, frames;
 125     int work_done = 0;
 126
 127     pa_assert(u);
 128     pa_assert(u->sink);
 129
 130     for (;;) {
 131         pa_memchunk chunk;
 132         void *p;
 133
 134         if ((n = snd_pcm_avail_update(u->pcm_handle)) < 0) {
 135
 136             if (n == -EPIPE) {
 137                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
 138                 u->first = 1;
 139             }
 140
 141             if ((err = snd_pcm_recover(u->pcm_handle, n, 1)) == 0)
 142                 continue;
 143
 144             if (err == -EAGAIN)
 145                 return work_done;
 146
 147             pa_log("snd_pcm_avail_update: %s", snd_strerror(n));
 148             return -1;
 149         }
 150
 151 /*         pa_log("Got request for %i samples", (int) n); */
 152
 153         if (n <= 0)
 154             return work_done;
 155
 156         frames = n;
 157
 158         if ((err = snd_pcm_mmap_begin(u->pcm_handle, &areas, &offset, &frames)) < 0) {
 159
 160             if (err == -EPIPE) {
 161                 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
 162                 u->first = 1;
 163             }
 164
 165             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 166                 continue;
 167
 168             if (err == -EAGAIN)
 169                 return work_done;
 170
 171             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 172             return -1;
 173         }
 174
 175         /* Check these are multiples of 8 bit */
 176         pa_assert((areas[0].first & 7) == 0);
 177         pa_assert((areas[0].step & 7)== 0);
 178
 179         /* We assume a single interleaved memory buffer */
 180         pa_assert((areas[0].first >> 3) == 0);
 181         pa_assert((areas[0].step >> 3) == u->frame_size);
 182
 183         p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
 184
 185         chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, 1);
 186         chunk.length = pa_memblock_get_length(chunk.memblock);
 187         chunk.index = 0;
 188
 189         pa_sink_render_into_full(u->sink, &chunk);
 190
 191         /* FIXME: Maybe we can do something to keep this memory block
 192          * a little bit longer around? */
 193         pa_memblock_unref_fixed(chunk.memblock);
 194
 195         if ((err = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0) {
 196
 197             if (err == -EPIPE) {
 198                 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
 199                 u->first = 1;
 200             }
 201
 202             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 203                 continue;
 204
 205             if (err == -EAGAIN)
 206                 return work_done;
 207
 208             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 209             return -1;
 210         }
 211
 212         work_done = 1;
 213
 214 /*         pa_log("wrote %i samples", (int) frames); */
 215     }
 216 }
 217
 218 static pa_usec_t sink_get_latency(struct userdata *u) {
 219     pa_usec_t r = 0;
 220     snd_pcm_status_t *status;
 221     snd_pcm_sframes_t frames = 0;
 222     int err;
 223
 224     snd_pcm_status_alloca(&status);
 225
 226     pa_assert(u);
 227
 228     if ((err = snd_pcm_status(u->pcm_handle, status)) < 0)
 229         pa_log("Failed to get delay: %s", snd_strerror(err));
 230     else
 231         frames = snd_pcm_status_get_delay(status);
 232
 233     if (frames > 0)
 234         r = pa_bytes_to_usec(frames * u->frame_size, &u->sink->sample_spec);
 235
 236     if (u->memchunk.memblock)
 237         r += pa_bytes_to_usec(u->memchunk.length, &u->sink->sample_spec);
 238
 239     return r;
 240 }
 241
 242 static int build_pollfd(struct userdata *u) {
 243     int err;
 244
 245     pa_assert(u);
 246     pa_assert(u->pcm_handle);
 247
 248     if ((u->n_alsa_fds = snd_pcm_poll_descriptors_count(u->pcm_handle)) < 0) {
 249         pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(u->n_alsa_fds));
 250         return -1;
 251     }
 252
 253     pa_xfree(u->pollfd);
 254     u->pollfd = pa_xnew0(struct pollfd, POLLFD_ALSA_BASE + u->n_alsa_fds);
 255
 256     u->pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->thread_mq.inq);
 257     u->pollfd[POLLFD_ASYNCQ].events = POLLIN;
 258
 259     if ((err = snd_pcm_poll_descriptors(u->pcm_handle, u->pollfd+POLLFD_ALSA_BASE, u->n_alsa_fds)) < 0) {
 260         pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
 261         return -1;
 262     }
 263
 264     return 0;
 265 }
 266
 267 static int suspend(struct userdata *u) {
 268     pa_assert(u);
 269     pa_assert(u->pcm_handle);
 270
 271     snd_pcm_drain(u->pcm_handle);    /* Let's suspend */
 272     snd_pcm_close(u->pcm_handle);
 273     u->pcm_handle = NULL;
 274
 275     pa_log_debug("Device suspended...");
 276
 277     return 0;
 278 }
 279
 280 static int unsuspend(struct userdata *u) {
 281     pa_sample_spec ss;
 282     int err, b;
 283     unsigned nfrags;
 284     snd_pcm_uframes_t period_size;
 285
 286     pa_assert(u);
 287     pa_assert(!u->pcm_handle);
 288
 289     pa_log_debug("Trying resume...");
 290
 291     snd_config_update_free_global();
 292     if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
 293         pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
 294         goto fail;
 295     }
 296
 297     ss = u->sink->sample_spec;
 298     nfrags = u->nfragments;
 299     period_size = u->fragment_size / u->frame_size;
 300     b = u->use_mmap;
 301
 302     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 303         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 304         goto fail;
 305     }
 306
 307     if (b != u->use_mmap) {
 308         pa_log_warn("Resume failed, couldn't get original access mode.");
 309         goto fail;
 310     }
 311
 312     if (!pa_sample_spec_equal(&ss, &u->sink->sample_spec)) {
 313         pa_log_warn("Resume failed, couldn't restore original sample settings.");
 314         goto fail;
 315     }
 316
 317     if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
 318         pa_log_warn("Resume failed, couldn't restore original fragment settings.");
 319         goto fail;
 320     }
 321
 322     if ((err = pa_alsa_set_sw_params(u->pcm_handle)) < 0) {
 323         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 324         goto fail;
 325     }
 326
 327     if (build_pollfd(u) < 0)
 328         goto fail;
 329
 330     /* FIXME: We need to reload the volume somehow */
 331
 332     u->first = 1;
 333
 334     pa_log_debug("Resumed successfully...");
 335
 336     return 0;
 337
 338 fail:
 339     if (u->pcm_handle) {
 340         snd_pcm_close(u->pcm_handle);
 341         u->pcm_handle = NULL;
 342     }
 343
 344     return -1;
 345 }
 346
 347 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 348     struct userdata *u = PA_SINK(o)->userdata;
 349
 350     switch (code) {
 351
 352         case PA_SINK_MESSAGE_GET_LATENCY: {
 353             pa_usec_t r = 0;
 354
 355             if (u->pcm_handle)
 356                 r = sink_get_latency(u);
 357
 358             *((pa_usec_t*) data) = r;
 359
 360             return 0;
 361         }
 362
 363         case PA_SINK_MESSAGE_SET_STATE:
 364
 365             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 366
 367                 case PA_SINK_SUSPENDED:
 368                     pa_assert(PA_SINK_OPENED(u->sink->thread_info.state));
 369
 370                     if (suspend(u) < 0)
 371                         return -1;
 372
 373                     break;
 374
 375                 case PA_SINK_IDLE:
 376                 case PA_SINK_RUNNING:
 377
 378                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
 379                         if (unsuspend(u) < 0)
 380                             return -1;
 381                     }
 382
 383                     break;
 384
 385                 case PA_SINK_DISCONNECTED:
 386                     ;
 387             }
 388
 389             break;
 390     }
 391
 392     return pa_sink_process_msg(o, code, data, offset, chunk);
 393 }
 394
 395 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 396     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 397
 398     pa_assert(u);
 399     pa_assert(u->mixer_handle);
 400
 401     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 402         return 0;
 403
 404     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 405         pa_sink_get_volume(u->sink);
 406         pa_sink_get_mute(u->sink);
 407     }
 408
 409     return 0;
 410 }
 411
 412 static int sink_get_volume_cb(pa_sink *s) {
 413     struct userdata *u = s->userdata;
 414     int err;
 415     int i;
 416
 417     pa_assert(u);
 418     pa_assert(u->mixer_elem);
 419
 420     for (i = 0; i < s->sample_spec.channels; i++) {
 421         long set_vol, vol;
 422
 423         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 424
 425         if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, i, &vol)) < 0)
 426             goto fail;
 427
 428         set_vol = (long) roundf(((float) s->volume.values[i] * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 429
 430         /* Try to avoid superfluous volume changes */
 431         if (set_vol != vol)
 432             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));
 433     }
 434
 435     return 0;
 436
 437 fail:
 438     pa_log_error("Unable to read volume: %s", snd_strerror(err));
 439
 440     s->get_volume = NULL;
 441     s->set_volume = NULL;
 442     return -1;
 443 }
 444
 445 static int sink_set_volume_cb(pa_sink *s) {
 446     struct userdata *u = s->userdata;
 447     int err;
 448     int i;
 449
 450     pa_assert(u);
 451     pa_assert(u->mixer_elem);
 452
 453     for (i = 0; i < s->sample_spec.channels; i++) {
 454         long alsa_vol;
 455         pa_volume_t vol;
 456
 457         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
 458
 459         vol = s->volume.values[i];
 460
 461         if (vol > PA_VOLUME_NORM)
 462             vol = PA_VOLUME_NORM;
 463
 464         alsa_vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 465
 466         if ((err = snd_mixer_selem_set_playback_volume(u->mixer_elem, i, alsa_vol)) < 0)
 467             goto fail;
 468     }
 469
 470     return 0;
 471
 472 fail:
 473     pa_log_error("Unable to set volume: %s", snd_strerror(err));
 474
 475     s->get_volume = NULL;
 476     s->set_volume = NULL;
 477     return -1;
 478 }
 479
 480 static int sink_get_mute_cb(pa_sink *s) {
 481     struct userdata *u = s->userdata;
 482     int err, sw;
 483
 484     pa_assert(u);
 485     pa_assert(u->mixer_elem);
 486
 487     if ((err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw)) < 0) {
 488         pa_log_error("Unable to get switch: %s", snd_strerror(err));
 489
 490         s->get_mute = NULL;
 491         s->set_mute = NULL;
 492         return -1;
 493     }
 494
 495     s->muted = !sw;
 496
 497     return 0;
 498 }
 499
 500 static int sink_set_mute_cb(pa_sink *s) {
 501     struct userdata *u = s->userdata;
 502     int err;
 503
 504     pa_assert(u);
 505     pa_assert(u->mixer_elem);
 506
 507     if ((err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->muted)) < 0) {
 508         pa_log_error("Unable to set switch: %s", snd_strerror(err));
 509
 510         s->get_mute = NULL;
 511         s->set_mute = NULL;
 512         return -1;
 513     }
 514
 515     return 0;
 516 }
 517
 518 static void thread_func(void *userdata) {
 519
 520     struct userdata *u = userdata;
 521     unsigned short revents = 0;
 522     snd_pcm_status_t *status;
 523     int err;
 524
 525     pa_assert(u);
 526     snd_pcm_status_alloca(&status);
 527
 528     pa_log_debug("Thread starting up");
 529
 530     if (u->core->high_priority)
 531         pa_make_realtime();
 532
 533     pa_thread_mq_install(&u->thread_mq);
 534
 535     if (build_pollfd(u) < 0)
 536         goto fail;
 537
 538     for (;;) {
 539         pa_msgobject *object;
 540         int code;
 541         void *data;
 542         pa_memchunk chunk;
 543         int64_t offset;
 544         int r;
 545
 546 /*         pa_log("loop");      */
 547
 548         /* Check whether there is a message for us to process */
 549         if (pa_asyncmsgq_get(u->thread_mq.inq, &object, &code, &data, &offset, &chunk, 0) == 0) {
 550             int ret;
 551
 552 /*             pa_log("processing msg");  */
 553
 554             if (!object && code == PA_MESSAGE_SHUTDOWN) {
 555                 pa_asyncmsgq_done(u->thread_mq.inq, 0);
 556                 goto finish;
 557             }
 558
 559             ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
 560             pa_asyncmsgq_done(u->thread_mq.inq, ret);
 561             continue;
 562         }
 563
 564 /*         pa_log("loop2"); */
 565
 566         /* Render some data and write it to the dsp */
 567
 568         if (PA_SINK_OPENED(u->sink->thread_info.state) && ((revents & POLLOUT) || u->first == 1)) {
 569             int work_done = 0;
 570             pa_assert(u->pcm_handle);
 571
 572             if (u->use_mmap) {
 573
 574                 if ((work_done = mmap_write(u)) < 0)
 575                     goto fail;
 576
 577             } else {
 578
 579                 for (;;) {
 580                     void *p;
 581                     snd_pcm_sframes_t t;
 582                     ssize_t l;
 583
 584                     if ((err = snd_pcm_status(u->pcm_handle, status)) < 0) {
 585                         pa_log("Failed to query DSP status data: %s", snd_strerror(t));
 586                         goto fail;
 587                     }
 588
 589                     if (snd_pcm_status_get_avail_max(status)*u->frame_size >= u->hwbuf_size)
 590                         pa_log_debug("Buffer underrun!");
 591
 592                     l = snd_pcm_status_get_avail(status) * u->frame_size;
 593
 594 /*                     pa_log("%u bytes to write", l); */
 595
 596                     if (l <= 0)
 597                         break;
 598
 599                     if (u->memchunk.length <= 0)
 600                         pa_sink_render(u->sink, l, &u->memchunk);
 601
 602                     pa_assert(u->memchunk.length > 0);
 603
 604                     p = pa_memblock_acquire(u->memchunk.memblock);
 605                     t = snd_pcm_writei(u->pcm_handle, (const uint8_t*) p + u->memchunk.index, u->memchunk.length / u->frame_size);
 606                     pa_memblock_release(u->memchunk.memblock);
 607
 608 /*                     pa_log("wrote %i bytes of %u (%u)", t*u->frame_size, u->memchunk.length, l);   */
 609
 610                     pa_assert(t != 0);
 611
 612                     if (t < 0) {
 613
 614                         if ((t = snd_pcm_recover(u->pcm_handle, t, 1)) == 0)
 615                             continue;
 616
 617                         if (t == -EAGAIN) {
 618                             pa_log_debug("EAGAIN");
 619                             break;
 620                         } else {
 621                             pa_log("Failed to write data to DSP: %s", snd_strerror(t));
 622                             goto fail;
 623                         }
 624                     }
 625
 626                     u->memchunk.index += t * u->frame_size;
 627                     u->memchunk.length -= t * u->frame_size;
 628
 629                     if (u->memchunk.length <= 0) {
 630                         pa_memblock_unref(u->memchunk.memblock);
 631                         pa_memchunk_reset(&u->memchunk);
 632                     }
 633
 634                     work_done = 1;
 635
 636                     if (t * u->frame_size >= (unsigned) l)
 637                         break;
 638                 }
 639             }
 640
 641             revents &= ~POLLOUT;
 642
 643             if (work_done) {
 644
 645                 if (u->first) {
 646                     pa_log_info("Starting playback.");
 647                     snd_pcm_start(u->pcm_handle);
 648                     u->first = 0;
 649                 }
 650
 651                 continue;
 652             }
 653         }
 654
 655         /* Hmm, nothing to do. Let's sleep */
 656         if (pa_asyncmsgq_before_poll(u->thread_mq.inq) < 0)
 657             continue;
 658
 659 /*         pa_log("polling for %i", POLLFD_ALSA_BASE + (PA_SINK_OPENED(u->sink->thread_info.state) ? u->n_alsa_fds : 0));    */
 660         r = poll(u->pollfd, POLLFD_ALSA_BASE + (PA_SINK_OPENED(u->sink->thread_info.state) ? u->n_alsa_fds : 0), -1);
 661 /*         pa_log("poll end"); */
 662
 663         pa_asyncmsgq_after_poll(u->thread_mq.inq);
 664
 665         if (r < 0) {
 666             if (errno == EINTR) {
 667                 u->pollfd[POLLFD_ASYNCQ].revents = 0;
 668                 revents = 0;
 669                 continue;
 670             }
 671
 672             pa_log("poll() failed: %s", pa_cstrerror(errno));
 673             goto fail;
 674         }
 675
 676         pa_assert(r > 0);
 677
 678         if (PA_SINK_OPENED(u->sink->thread_info.state)) {
 679             if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, u->pollfd + POLLFD_ALSA_BASE, u->n_alsa_fds, &revents)) < 0) {
 680                 pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
 681                 goto fail;
 682             }
 683
 684             if (revents & (POLLERR|POLLNVAL|POLLHUP)) {
 685                 if (revents & POLLERR)
 686                     pa_log_warn("Got POLLERR from ALSA");
 687                 if (revents & POLLNVAL)
 688                     pa_log_warn("Got POLLNVAL from ALSA");
 689                 if (revents & POLLHUP)
 690                     pa_log_warn("Got POLLHUP from ALSA");
 691
 692                 goto fail;
 693             }
 694 /*             pa_log("got alsa event"); */
 695         } else
 696             revents = 0;
 697
 698         pa_assert((u->pollfd[POLLFD_ASYNCQ].revents & ~POLLIN) == 0);
 699     }
 700
 701 fail:
 702     /* We have to continue processing messages until we receive the
 703      * SHUTDOWN message */
 704     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 705     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 706
 707 finish:
 708     pa_log_debug("Thread shutting down");
 709 }
 710
 711 int pa__init(pa_module*m) {
 712
 713     pa_modargs *ma = NULL;
 714     int ret = -1;
 715     struct userdata *u = NULL;
 716     const char *dev;
 717     pa_sample_spec ss;
 718     pa_channel_map map;
 719     uint32_t nfrags, frag_size;
 720     snd_pcm_uframes_t period_size;
 721     size_t frame_size;
 722     snd_pcm_info_t *pcm_info = NULL;
 723     int err;
 724     char *t;
 725     const char *name;
 726     char *name_buf = NULL;
 727     int namereg_fail;
 728     int use_mmap = 1, b;
 729
 730     pa_assert(m);
 731
 732     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 733         pa_log("Failed to parse module arguments");
 734         goto fail;
 735     }
 736
 737     ss = m->core->default_sample_spec;
 738     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
 739         pa_log("Failed to parse sample specification and channel map");
 740         goto fail;
 741     }
 742
 743     frame_size = pa_frame_size(&ss);
 744
 745     nfrags = m->core->default_n_fragments;
 746     frag_size = pa_usec_to_bytes(m->core->default_fragment_size_msec*1000, &ss);
 747     if (frag_size <= 0)
 748         frag_size = frame_size;
 749
 750     if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0) {
 751         pa_log("Failed to parse buffer metrics");
 752         goto fail;
 753     }
 754     period_size = frag_size/frame_size;
 755
 756     if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
 757         pa_log("Failed to parse mmap argument.");
 758         goto fail;
 759     }
 760
 761     u = pa_xnew0(struct userdata, 1);
 762     u->core = m->core;
 763     u->module = m;
 764     m->userdata = u;
 765     u->use_mmap = use_mmap;
 766     u->first = 1;
 767     u->n_alsa_fds = 0;
 768     u->pollfd = NULL;
 769     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
 770
 771     snd_config_update_free_global();
 772     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) {
 773         pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
 774         goto fail;
 775     }
 776
 777     u->device_name = pa_xstrdup(dev);
 778
 779     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 780         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 781         pa_log("Error fetching PCM info: %s", snd_strerror(err));
 782         goto fail;
 783     }
 784
 785     b = use_mmap;
 786     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 787         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 788         goto fail;
 789     }
 790
 791     if (use_mmap && !b) {
 792         pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
 793         u->use_mmap = use_mmap = b;
 794     }
 795
 796     if (u->use_mmap)
 797         pa_log_info("Successfully enabled mmap() mode.");
 798
 799     if ((err = pa_alsa_set_sw_params(u->pcm_handle)) < 0) {
 800         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 801         goto fail;
 802     }
 803
 804     /* ALSA might tweak the sample spec, so recalculate the frame size */
 805     frame_size = pa_frame_size(&ss);
 806
 807     if (ss.channels != map.channels)
 808         /* Seems ALSA didn't like the channel number, so let's fix the channel map */
 809         pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
 810
 811     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
 812         pa_log_warn("Error opening mixer: %s", snd_strerror(err));
 813     else {
 814
 815         if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 816             !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Master", "PCM"))) {
 817
 818             snd_mixer_close(u->mixer_handle);
 819             u->mixer_handle = NULL;
 820         }
 821     }
 822
 823     if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
 824         namereg_fail = 1;
 825     else {
 826         name = name_buf = pa_sprintf_malloc("alsa_output.%s", dev);
 827         namereg_fail = 0;
 828     }
 829
 830     u->sink = pa_sink_new(m->core, __FILE__, name, namereg_fail, &ss, &map);
 831     pa_xfree(name_buf);
 832
 833     if (!u->sink) {
 834         pa_log("Failed to create sink object");
 835         goto fail;
 836     }
 837
 838     u->sink->parent.process_msg = sink_process_msg;
 839     u->sink->userdata = u;
 840
 841     pa_sink_set_module(u->sink, m);
 842     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 843     pa_sink_set_description(u->sink, t = pa_sprintf_malloc(
 844                                     "ALSA PCM on %s (%s)%s",
 845                                     dev,
 846                                     snd_pcm_info_get_name(pcm_info),
 847                                     use_mmap ? " via DMA" : ""));
 848     pa_xfree(t);
 849
 850     u->sink->is_hardware = 1;
 851
 852     u->frame_size = frame_size;
 853     u->fragment_size = frag_size = period_size * frame_size;
 854     u->nfragments = nfrags;
 855     u->hwbuf_size = u->fragment_size * nfrags;
 856
 857     pa_log_info("Using %u fragments of size %lu bytes.", nfrags, (long unsigned) u->fragment_size);
 858
 859     pa_memchunk_reset(&u->memchunk);
 860
 861     if (u->mixer_handle) {
 862         /* Initialize mixer code */
 863
 864         pa_assert(u->mixer_elem);
 865
 866         if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
 867             int i;
 868
 869             for (i = 0;i < ss.channels; i++) {
 870                 if (!snd_mixer_selem_has_playback_channel(u->mixer_elem, i))
 871                     break;
 872             }
 873
 874             if (i == ss.channels) {
 875                 u->sink->get_volume = sink_get_volume_cb;
 876                 u->sink->set_volume = sink_set_volume_cb;
 877                 snd_mixer_selem_get_playback_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 878             }
 879         }
 880
 881         if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
 882             u->sink->get_mute = sink_get_mute_cb;
 883             u->sink->set_mute = sink_set_mute_cb;
 884         }
 885
 886         u->mixer_fdl = pa_alsa_fdlist_new();
 887
 888         if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, m->core->mainloop) < 0) {
 889             pa_log("failed to initialise file descriptor monitoring");
 890             goto fail;
 891         }
 892
 893         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 894         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 895     } else
 896         u->mixer_fdl = NULL;
 897
 898     if (!(u->thread = pa_thread_new(thread_func, u))) {
 899         pa_log("Failed to create thread.");
 900         goto fail;
 901     }
 902
 903     /* Get initial mixer settings */
 904     if (u->sink->get_volume)
 905         u->sink->get_volume(u->sink);
 906     if (u->sink->get_mute)
 907         u->sink->get_mute(u->sink);
 908
 909     ret = 0;
 910
 911 finish:
 912
 913      if (ma)
 914          pa_modargs_free(ma);
 915
 916      if (pcm_info)
 917          snd_pcm_info_free(pcm_info);
 918
 919     return ret;
 920
 921 fail:
 922
 923     if (u)
 924         pa__done(m);
 925
 926     goto finish;
 927 }
 928
 929 void pa__done(pa_module*m) {
 930     struct userdata *u;
 931
 932     pa_assert(m);
 933
 934     if (!(u = m->userdata))
 935         return;
 936
 937     if (u->sink)
 938         pa_sink_disconnect(u->sink);
 939
 940     if (u->thread) {
 941         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 942         pa_thread_free(u->thread);
 943     }
 944
 945     pa_thread_mq_done(&u->thread_mq);
 946
 947     if (u->sink)
 948         pa_sink_unref(u->sink);
 949
 950     if (u->memchunk.memblock)
 951         pa_memblock_unref(u->memchunk.memblock);
 952
 953     if (u->mixer_fdl)
 954         pa_alsa_fdlist_free(u->mixer_fdl);
 955
 956     if (u->mixer_handle)
 957         snd_mixer_close(u->mixer_handle);
 958
 959     if (u->pcm_handle) {
 960         snd_pcm_drop(u->pcm_handle);
 961         snd_pcm_close(u->pcm_handle);
 962     }
 963
 964     pa_xfree(u->pollfd);
 965     pa_xfree(u->device_name);
 966     pa_xfree(u);
 967
 968     snd_config_update_free_global();
 969 }
 970