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