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