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 #include <asoundlib.h>
  32
  33 #include <pulse/xmalloc.h>
  34 #include <pulse/util.h>
  35 #include <pulse/timeval.h>
  36
  37 #include <pulsecore/core.h>
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/memchunk.h>
  40 #include <pulsecore/sink.h>
  41 #include <pulsecore/modargs.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/sample-util.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/macro.h>
  46 #include <pulsecore/thread.h>
  47 #include <pulsecore/core-error.h>
  48 #include <pulsecore/thread-mq.h>
  49 #include <pulsecore/rtpoll.h>
  50 #include <pulsecore/rtclock.h>
  51 #include <pulsecore/time-smoother.h>
  52
  53 #include "alsa-util.h"
  54 #include "module-alsa-sink-symdef.h"
  55
  56 PA_MODULE_AUTHOR("Lennart Poettering");
  57 PA_MODULE_DESCRIPTION("ALSA Sink");
  58 PA_MODULE_VERSION(PACKAGE_VERSION);
  59 PA_MODULE_LOAD_ONCE(FALSE);
  60 PA_MODULE_USAGE(
  61         "sink_name=<name for the sink> "
  62         "device=<ALSA device> "
  63         "device_id=<ALSA device id> "
  64         "format=<sample format> "
  65         "rate=<sample rate> "
  66         "channels=<number of channels> "
  67         "channel_map=<channel map> "
  68         "fragments=<number of fragments> "
  69         "fragment_size=<fragment size> "
  70         "mmap=<enable memory mapping?> "
  71         "tsched=<enable system timer based scheduling mode?> "
  72         "tsched_buffer_size=<buffer size when using timer based scheduling> "
  73         "tsched_buffer_watermark=<lower fill watermark>");
  74
  75 #define DEFAULT_DEVICE "default"
  76 #define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)
  77 #define DEFAULT_TSCHED_WATERMARK_USEC (10*PA_USEC_PER_MSEC)
  78
  79 struct userdata {
  80     pa_core *core;
  81     pa_module *module;
  82     pa_sink *sink;
  83
  84     pa_thread *thread;
  85     pa_thread_mq thread_mq;
  86     pa_rtpoll *rtpoll;
  87
  88     snd_pcm_t *pcm_handle;
  89
  90     pa_alsa_fdlist *mixer_fdl;
  91     snd_mixer_t *mixer_handle;
  92     snd_mixer_elem_t *mixer_elem;
  93     long hw_volume_max, hw_volume_min;
  94     long hw_dB_max, hw_dB_min;
  95     pa_bool_t hw_dB_supported;
  96
  97     size_t frame_size, fragment_size, hwbuf_size, tsched_watermark;
  98     unsigned nfragments;
  99     pa_memchunk memchunk;
 100
 101     char *device_name;
 102
 103     pa_bool_t use_mmap, use_tsched;
 104
 105     pa_bool_t first;
 106
 107     pa_rtpoll_item *alsa_rtpoll_item;
 108
 109     snd_mixer_selem_channel_id_t mixer_map[SND_MIXER_SCHN_LAST];
 110
 111     pa_smoother *smoother;
 112     int64_t frame_index;
 113
 114     snd_pcm_sframes_t hwbuf_unused_frames;
 115 };
 116
 117 static const char* const valid_modargs[] = {
 118     "sink_name",
 119     "device",
 120     "device_id",
 121     "format",
 122     "rate",
 123     "channels",
 124     "channel_map",
 125     "fragments",
 126     "fragment_size",
 127     "mmap",
 128     "tsched",
 129     "tsched_buffer_size",
 130     "tsched_buffer_watermark",
 131     NULL
 132 };
 133
 134 static int mmap_write(struct userdata *u) {
 135     int work_done = 0;
 136
 137     pa_assert(u);
 138     pa_sink_assert_ref(u->sink);
 139
 140     for (;;) {
 141         pa_memchunk chunk;
 142         void *p;
 143         snd_pcm_sframes_t n;
 144         int err;
 145         const snd_pcm_channel_area_t *areas;
 146         snd_pcm_uframes_t offset, frames;
 147
 148         snd_pcm_hwsync(u->pcm_handle);
 149
 150         /* First we determine how many samples are missing to fill the
 151          * buffer up to 100% */
 152
 153         if (PA_UNLIKELY((n = snd_pcm_avail_update(u->pcm_handle)) < 0)) {
 154
 155             pa_log_debug("snd_pcm_avail_update: %s", snd_strerror(n));
 156
 157             if (err == -EAGAIN) {
 158                 pa_log_debug("EAGAIN");
 159                 return work_done;
 160             }
 161
 162             if (n == -EPIPE)
 163                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
 164
 165             if ((err = snd_pcm_recover(u->pcm_handle, n, 1)) == 0) {
 166                 u->first = TRUE;
 167                 continue;
 168             }
 169
 170             pa_log("snd_pcm_recover: %s", snd_strerror(err));
 171             return -1;
 172         }
 173
 174         /* We only use part of the buffer that matches our
 175          * dynamically requested latency */
 176
 177         if (PA_UNLIKELY(n <= u->hwbuf_unused_frames))
 178             return work_done;
 179
 180         frames = n = n - u->hwbuf_unused_frames;
 181
 182         if (PA_UNLIKELY((err = snd_pcm_mmap_begin(u->pcm_handle, &areas, &offset, &frames)) < 0)) {
 183
 184             pa_log_debug("snd_pcm_mmap_begin: %s", snd_strerror(err));
 185
 186             if (err == -EAGAIN) {
 187                 pa_log_debug("EAGAIN");
 188                 return work_done;
 189             }
 190
 191             if (err == -EPIPE)
 192                 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
 193
 194             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0) {
 195                 u->first = TRUE;
 196                 continue;
 197             }
 198
 199             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 200             return -1;
 201         }
 202
 203         /* Check these are multiples of 8 bit */
 204         pa_assert((areas[0].first & 7) == 0);
 205         pa_assert((areas[0].step & 7)== 0);
 206
 207         /* We assume a single interleaved memory buffer */
 208         pa_assert((areas[0].first >> 3) == 0);
 209         pa_assert((areas[0].step >> 3) == u->frame_size);
 210
 211         p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
 212
 213         chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, 1);
 214         chunk.length = pa_memblock_get_length(chunk.memblock);
 215         chunk.index = 0;
 216
 217         pa_sink_render_into_full(u->sink, &chunk);
 218
 219         /* FIXME: Maybe we can do something to keep this memory block
 220          * a little bit longer around? */
 221         pa_memblock_unref_fixed(chunk.memblock);
 222
 223         if (PA_UNLIKELY((err = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0)) {
 224
 225             pa_log_debug("snd_pcm_mmap_commit: %s", snd_strerror(err));
 226
 227             if (err == -EAGAIN) {
 228                 pa_log_debug("EAGAIN");
 229                 return work_done;
 230             }
 231
 232             if (err == -EPIPE)
 233                 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
 234
 235             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0) {
 236                 u->first = TRUE;
 237                 continue;
 238             }
 239
 240             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 241             return -1;
 242         }
 243
 244         work_done = 1;
 245
 246         u->frame_index += frames;
 247
 248         pa_log_debug("wrote %llu frames", (unsigned long long) frames);
 249
 250         if (PA_LIKELY(frames >= (snd_pcm_uframes_t) n))
 251             return work_done;
 252     }
 253 }
 254
 255 static int unix_write(struct userdata *u) {
 256     snd_pcm_status_t *status;
 257     int work_done = 0;
 258
 259     snd_pcm_status_alloca(&status);
 260
 261     pa_assert(u);
 262     pa_sink_assert_ref(u->sink);
 263
 264     for (;;) {
 265         void *p;
 266         snd_pcm_sframes_t n, frames;
 267         int err;
 268
 269         snd_pcm_hwsync(u->pcm_handle);
 270
 271         if (PA_UNLIKELY((err = snd_pcm_status(u->pcm_handle, status)) < 0)) {
 272             pa_log("Failed to query DSP status data: %s", snd_strerror(err));
 273             return -1;
 274         }
 275
 276         if (PA_UNLIKELY(snd_pcm_status_get_avail_max(status)*u->frame_size >= u->hwbuf_size))
 277             pa_log_debug("Buffer underrun!");
 278
 279         n = snd_pcm_status_get_avail(status);
 280
 281         /* We only use part of the buffer that matches our
 282          * dynamically requested latency */
 283
 284         if (PA_UNLIKELY(n <= u->hwbuf_unused_frames))
 285             return work_done;
 286
 287         n -= u->hwbuf_unused_frames;
 288
 289         if (u->memchunk.length <= 0)
 290             pa_sink_render(u->sink, n * u->frame_size, &u->memchunk);
 291
 292         pa_assert(u->memchunk.length > 0);
 293
 294         frames = u->memchunk.length / u->frame_size;
 295
 296         if (frames > n)
 297             frames = n;
 298
 299         p = pa_memblock_acquire(u->memchunk.memblock);
 300         frames = snd_pcm_writei(u->pcm_handle, (const uint8_t*) p + u->memchunk.index, frames);
 301         pa_memblock_release(u->memchunk.memblock);
 302
 303         pa_assert(frames != 0);
 304
 305         if (PA_UNLIKELY(frames < 0)) {
 306
 307             if (frames == -EAGAIN) {
 308                 pa_log_debug("EAGAIN");
 309                 return work_done;
 310             }
 311
 312             if (frames == -EPIPE)
 313                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
 314
 315             if ((frames = snd_pcm_recover(u->pcm_handle, frames, 1)) == 0) {
 316                 u->first = TRUE;
 317                 continue;
 318             }
 319
 320             pa_log("Failed to write data to DSP: %s", snd_strerror(frames));
 321             return -1;
 322         }
 323
 324         u->memchunk.index += frames * u->frame_size;
 325         u->memchunk.length -= frames * u->frame_size;
 326
 327         if (u->memchunk.length <= 0) {
 328             pa_memblock_unref(u->memchunk.memblock);
 329             pa_memchunk_reset(&u->memchunk);
 330         }
 331
 332         work_done = 1;
 333
 334         u->frame_index += frames;
 335
 336         if (PA_LIKELY(frames >= n))
 337             return work_done;
 338     }
 339 }
 340
 341 static void update_smoother(struct userdata *u) {
 342     snd_pcm_sframes_t delay  = 0;
 343     int64_t frames;
 344     int err;
 345     pa_usec_t now1, now2;
 346
 347     pa_assert(u);
 348     pa_assert(u->pcm_handle);
 349
 350     /* Let's update the time smoother */
 351
 352     snd_pcm_hwsync(u->pcm_handle);
 353     snd_pcm_avail_update(u->pcm_handle);
 354
 355     if (PA_UNLIKELY((err = snd_pcm_delay(u->pcm_handle, &delay)) < 0)) {
 356         pa_log_warn("Failed to get delay: %s", snd_strerror(err));
 357         return;
 358     }
 359
 360     frames = u->frame_index - delay;
 361
 362     pa_log_debug("frame_index = %llu, delay = %llu, p = %llu", (unsigned long long) u->frame_index, (unsigned long long) delay, (unsigned long long) frames);
 363
 364     now1 = pa_rtclock_usec();
 365     now2 = pa_bytes_to_usec(frames * u->frame_size, &u->sink->sample_spec);
 366     pa_smoother_put(u->smoother, now1, now2);
 367 }
 368
 369 static pa_usec_t sink_get_latency(struct userdata *u) {
 370     pa_usec_t r = 0;
 371     int64_t delay;
 372
 373     pa_assert(u);
 374
 375     delay = u->frame_index - pa_smoother_get(u->smoother, pa_rtclock_usec());
 376
 377     if (delay > 0)
 378         r = pa_bytes_to_usec(delay * u->frame_size, &u->sink->sample_spec);
 379
 380     if (u->memchunk.memblock)
 381         r += pa_bytes_to_usec(u->memchunk.length, &u->sink->sample_spec);
 382
 383     return r;
 384 }
 385
 386 static int build_pollfd(struct userdata *u) {
 387     int err;
 388     struct pollfd *pollfd;
 389     int n;
 390
 391     pa_assert(u);
 392     pa_assert(u->pcm_handle);
 393
 394     if ((n = snd_pcm_poll_descriptors_count(u->pcm_handle)) < 0) {
 395         pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
 396         return -1;
 397     }
 398
 399     if (u->alsa_rtpoll_item)
 400         pa_rtpoll_item_free(u->alsa_rtpoll_item);
 401
 402     u->alsa_rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, n);
 403     pollfd = pa_rtpoll_item_get_pollfd(u->alsa_rtpoll_item, NULL);
 404
 405     if ((err = snd_pcm_poll_descriptors(u->pcm_handle, pollfd, n)) < 0) {
 406         pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
 407         return -1;
 408     }
 409
 410     return 0;
 411 }
 412
 413 static int suspend(struct userdata *u) {
 414     pa_assert(u);
 415     pa_assert(u->pcm_handle);
 416
 417     pa_smoother_pause(u->smoother, pa_rtclock_usec());
 418
 419     /* Let's suspend */
 420     snd_pcm_drain(u->pcm_handle);
 421     snd_pcm_close(u->pcm_handle);
 422     u->pcm_handle = NULL;
 423
 424     if (u->alsa_rtpoll_item) {
 425         pa_rtpoll_item_free(u->alsa_rtpoll_item);
 426         u->alsa_rtpoll_item = NULL;
 427     }
 428
 429     pa_log_info("Device suspended...");
 430
 431     return 0;
 432 }
 433
 434 static pa_usec_t hw_sleep_time(struct userdata *u) {
 435     pa_usec_t usec, wm;
 436
 437     pa_assert(u);
 438
 439     usec = pa_sink_get_requested_latency(u->sink);
 440
 441     if (usec <= 0)
 442         usec = pa_bytes_to_usec(u->hwbuf_size, &u->sink->sample_spec);
 443
 444     pa_log_debug("hw buffer time: %u ms", (unsigned) (usec / PA_USEC_PER_MSEC));
 445
 446     wm = pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec);
 447
 448     if (usec >= wm)
 449         usec -= wm;
 450     else
 451         usec /= 2;
 452
 453     pa_log_debug("after watermark: %u ms", (unsigned) (usec / PA_USEC_PER_MSEC));
 454
 455     return usec;
 456 }
 457
 458 static void update_hwbuf_unused_frames(struct userdata *u) {
 459     pa_usec_t usec;
 460     size_t b;
 461
 462     pa_assert(u);
 463
 464     if ((usec = pa_sink_get_requested_latency(u->sink)) <= 0) {
 465         /* Use the full buffer if noone asked us for anything
 466          * specific */
 467         u->hwbuf_unused_frames = 0;
 468         return;
 469     }
 470
 471     b = pa_usec_to_bytes(usec, &u->sink->sample_spec);
 472
 473     /* We need at least one sample in our buffer */
 474
 475     if (PA_UNLIKELY(b < u->frame_size))
 476         b = u->frame_size;
 477
 478     u->hwbuf_unused_frames =
 479         PA_LIKELY(b < u->hwbuf_size) ?
 480         ((u->hwbuf_size - b) / u->frame_size) : 0;
 481 }
 482
 483 static int update_sw_params(struct userdata *u) {
 484     snd_pcm_uframes_t avail_min;
 485     int err;
 486
 487     pa_assert(u);
 488
 489     if (u->use_tsched) {
 490         pa_usec_t usec;
 491
 492         usec = hw_sleep_time(u);
 493
 494         avail_min = pa_usec_to_bytes(usec, &u->sink->sample_spec) / u->frame_size;
 495
 496         if (avail_min <= 0)
 497             avail_min = 1;
 498
 499     } else
 500         avail_min = 1;
 501
 502     avail_min = (snd_pcm_uframes_t) -1;
 503
 504     pa_log("setting avail_min=%lu", (unsigned long) avail_min);
 505
 506     if ((err = pa_alsa_set_sw_params(u->pcm_handle, avail_min)) < 0) {
 507         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 508         return err;
 509     }
 510
 511     update_hwbuf_unused_frames(u);
 512
 513     pa_log("hwbuf_unused_frames=%lu", (unsigned long) u->hwbuf_unused_frames);
 514
 515     return 0;
 516 }
 517
 518 static int unsuspend(struct userdata *u) {
 519     pa_sample_spec ss;
 520     int err;
 521     pa_bool_t b, d;
 522     unsigned nfrags;
 523     snd_pcm_uframes_t period_size;
 524
 525     pa_assert(u);
 526     pa_assert(!u->pcm_handle);
 527
 528     pa_log_info("Trying resume...");
 529
 530     snd_config_update_free_global();
 531     if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
 532         pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
 533         goto fail;
 534     }
 535
 536     ss = u->sink->sample_spec;
 537     nfrags = u->nfragments;
 538     period_size = u->fragment_size / u->frame_size;
 539     b = u->use_mmap;
 540     d = u->use_tsched;
 541
 542     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, u->hwbuf_size / u->frame_size, &b, &d, TRUE)) < 0) {
 543         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 544         goto fail;
 545     }
 546
 547     if (b != u->use_mmap || d != u->use_tsched) {
 548         pa_log_warn("Resume failed, couldn't get original access mode.");
 549         goto fail;
 550     }
 551
 552     if (!pa_sample_spec_equal(&ss, &u->sink->sample_spec)) {
 553         pa_log_warn("Resume failed, couldn't restore original sample settings.");
 554         goto fail;
 555     }
 556
 557     if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
 558         pa_log_warn("Resume failed, couldn't restore original fragment settings.");
 559         goto fail;
 560     }
 561
 562     if (update_sw_params(u) < 0)
 563         goto fail;
 564
 565     if (build_pollfd(u) < 0)
 566         goto fail;
 567
 568     /* FIXME: We need to reload the volume somehow */
 569
 570     u->first = TRUE;
 571
 572     pa_log_info("Resumed successfully...");
 573
 574     return 0;
 575
 576 fail:
 577     if (u->pcm_handle) {
 578         snd_pcm_close(u->pcm_handle);
 579         u->pcm_handle = NULL;
 580     }
 581
 582     return -1;
 583 }
 584
 585 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 586     struct userdata *u = PA_SINK(o)->userdata;
 587
 588     switch (code) {
 589
 590         case PA_SINK_MESSAGE_GET_LATENCY: {
 591             pa_usec_t r = 0;
 592
 593             if (u->pcm_handle)
 594                 r = sink_get_latency(u);
 595
 596             *((pa_usec_t*) data) = r;
 597
 598             return 0;
 599         }
 600
 601         case PA_SINK_MESSAGE_SET_STATE:
 602
 603             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 604
 605                 case PA_SINK_SUSPENDED:
 606                     pa_assert(PA_SINK_OPENED(u->sink->thread_info.state));
 607
 608                     if (suspend(u) < 0)
 609                         return -1;
 610
 611                     break;
 612
 613                 case PA_SINK_IDLE:
 614                 case PA_SINK_RUNNING:
 615
 616                     if (u->sink->thread_info.state == PA_SINK_INIT) {
 617                         if (build_pollfd(u) < 0)
 618                             return -1;
 619                     }
 620
 621                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
 622                         if (unsuspend(u) < 0)
 623                             return -1;
 624                     }
 625
 626                     break;
 627
 628                 case PA_SINK_UNLINKED:
 629                 case PA_SINK_INIT:
 630                     ;
 631             }
 632
 633             break;
 634
 635 /*         case PA_SINK_MESSAGE_ADD_INPUT: */
 636 /*         case PA_SINK_MESSAGE_REMOVE_INPUT: */
 637 /*         case PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER: { */
 638 /*             int r = pa_sink_process_msg(o, code, data, offset, chunk); */
 639 /*             update_hwbuf_unused_frames(u); */
 640 /*             return r; */
 641 /*         } */
 642     }
 643
 644     return pa_sink_process_msg(o, code, data, offset, chunk);
 645 }
 646
 647 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 648     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 649
 650     pa_assert(u);
 651     pa_assert(u->mixer_handle);
 652
 653     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 654         return 0;
 655
 656     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 657         pa_sink_get_volume(u->sink);
 658         pa_sink_get_mute(u->sink);
 659     }
 660
 661     return 0;
 662 }
 663
 664 static int sink_get_volume_cb(pa_sink *s) {
 665     struct userdata *u = s->userdata;
 666     int err;
 667     int i;
 668
 669     pa_assert(u);
 670     pa_assert(u->mixer_elem);
 671
 672     for (i = 0; i < s->sample_spec.channels; i++) {
 673         long alsa_vol;
 674
 675         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, u->mixer_map[i]));
 676
 677         if (u->hw_dB_supported) {
 678
 679             if ((err = snd_mixer_selem_get_playback_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol)) >= 0) {
 680                 s->volume.values[i] = pa_sw_volume_from_dB(alsa_vol / 100.0);
 681                 continue;
 682             }
 683
 684             u->hw_dB_supported = FALSE;
 685         }
 686
 687         if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
 688             goto fail;
 689
 690         s->volume.values[i] = (pa_volume_t) roundf(((float) (alsa_vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
 691     }
 692
 693     return 0;
 694
 695 fail:
 696     pa_log_error("Unable to read volume: %s", snd_strerror(err));
 697
 698     return -1;
 699 }
 700
 701 static int sink_set_volume_cb(pa_sink *s) {
 702     struct userdata *u = s->userdata;
 703     int err;
 704     int i;
 705
 706     pa_assert(u);
 707     pa_assert(u->mixer_elem);
 708
 709     for (i = 0; i < s->sample_spec.channels; i++) {
 710         long alsa_vol;
 711         pa_volume_t vol;
 712
 713         pa_assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, u->mixer_map[i]));
 714
 715         vol = PA_MIN(s->volume.values[i], PA_VOLUME_NORM);
 716
 717         if (u->hw_dB_supported) {
 718             alsa_vol = (long) (pa_sw_volume_to_dB(vol) * 100);
 719             alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_dB_min, u->hw_dB_max);
 720
 721             if ((err = snd_mixer_selem_set_playback_dB(u->mixer_elem, u->mixer_map[i], alsa_vol, -1)) >= 0) {
 722
 723                 if (snd_mixer_selem_get_playback_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol) >= 0)
 724                     s->volume.values[i] = pa_sw_volume_from_dB(alsa_vol / 100.0);
 725
 726                 continue;
 727             }
 728
 729             u->hw_dB_supported = FALSE;
 730
 731         }
 732
 733         alsa_vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 734         alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_volume_min, u->hw_volume_max);
 735
 736         if ((err = snd_mixer_selem_set_playback_volume(u->mixer_elem, u->mixer_map[i], alsa_vol)) < 0)
 737             goto fail;
 738
 739         if (snd_mixer_selem_get_playback_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol) >= 0)
 740             s->volume.values[i] = (pa_volume_t) roundf(((float) (alsa_vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
 741     }
 742
 743     return 0;
 744
 745 fail:
 746     pa_log_error("Unable to set volume: %s", snd_strerror(err));
 747
 748     return -1;
 749 }
 750
 751 static int sink_get_mute_cb(pa_sink *s) {
 752     struct userdata *u = s->userdata;
 753     int err, sw;
 754
 755     pa_assert(u);
 756     pa_assert(u->mixer_elem);
 757
 758     if ((err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw)) < 0) {
 759         pa_log_error("Unable to get switch: %s", snd_strerror(err));
 760         return -1;
 761     }
 762
 763     s->muted = !sw;
 764
 765     return 0;
 766 }
 767
 768 static int sink_set_mute_cb(pa_sink *s) {
 769     struct userdata *u = s->userdata;
 770     int err;
 771
 772     pa_assert(u);
 773     pa_assert(u->mixer_elem);
 774
 775     if ((err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->muted)) < 0) {
 776         pa_log_error("Unable to set switch: %s", snd_strerror(err));
 777         return -1;
 778     }
 779
 780     return 0;
 781 }
 782
 783 static void sink_update_requested_latency_cb(pa_sink *s) {
 784     struct userdata *u = s->userdata;
 785
 786     pa_assert(u);
 787
 788     update_sw_params(u);
 789 }
 790
 791 static void thread_func(void *userdata) {
 792     struct userdata *u = userdata;
 793
 794     pa_assert(u);
 795
 796     pa_log_debug("Thread starting up");
 797
 798     if (u->core->realtime_scheduling)
 799         pa_make_realtime(u->core->realtime_priority);
 800
 801     pa_thread_mq_install(&u->thread_mq);
 802     pa_rtpoll_install(u->rtpoll);
 803
 804 /*     update_hwbuf_unused_frames(u); */
 805
 806     for (;;) {
 807         int ret;
 808
 809         pa_log_debug("loop");
 810
 811         /* Render some data and write it to the dsp */
 812         if (PA_SINK_OPENED(u->sink->thread_info.state)) {
 813             int work_done = 0;
 814
 815             if (u->sink->thread_info.rewind_nbytes > 0 && u->use_tsched) {
 816                 snd_pcm_sframes_t frames, limit, unused;
 817
 818                 pa_log_debug("Requested to rewind %lu bytes.", (unsigned long) u->sink->thread_info.rewind_nbytes);
 819
 820                 frames = u->sink->thread_info.rewind_nbytes / u->frame_size;
 821
 822                 snd_pcm_hwsync(u->pcm_handle);
 823                 if ((unused = snd_pcm_avail_update(u->pcm_handle)) < 0) {
 824                     pa_log("snd_pcm_avail_update() failed: %s", snd_strerror(unused));
 825                     goto fail;
 826                 }
 827
 828                 limit = (u->hwbuf_size / u->frame_size) - unused;
 829
 830                 if (frames > limit)
 831                     frames = limit;
 832
 833                 frames = 0;
 834
 835                 if (frames > 0) {
 836
 837                     pa_log_debug("Limited to %lu bytes.", (unsigned long) frames * u->frame_size);
 838
 839                     if ((frames = snd_pcm_rewind(u->pcm_handle, frames)) < 0) {
 840                         pa_log("snd_pcm_rewind() failed: %s", snd_strerror(frames));
 841                         goto fail;
 842                     }
 843
 844                     if ((u->sink->thread_info.rewind_nbytes = frames * u->frame_size) <= 0)
 845                         pa_log_info("Tried rewind, but was apparently not possible.");
 846                     else {
 847                         u->frame_index -= frames;
 848                         pa_log_debug("Rewound %lu bytes.", (unsigned long) u->sink->thread_info.rewind_nbytes);
 849                         pa_sink_process_rewind(u->sink);
 850                     }
 851                 } else {
 852                     pa_log_debug("Mhmm, actually there is nothing to rewind.");
 853                 }
 854             }
 855
 856             if (u->use_mmap) {
 857                 if ((work_done = mmap_write(u)) < 0)
 858                     goto fail;
 859             } else {
 860                 if ((work_done = unix_write(u)) < 0)
 861                     goto fail;
 862             }
 863
 864             pa_log_debug("work_done = %i", work_done);
 865
 866             if (work_done) {
 867
 868                 if (u->first) {
 869                     pa_log_info("Starting playback.");
 870                     snd_pcm_start(u->pcm_handle);
 871                     u->first = FALSE;
 872
 873                     pa_smoother_resume(u->smoother, pa_rtclock_usec());
 874                 }
 875
 876                 update_smoother(u);
 877             }
 878
 879             if (u->use_tsched) {
 880                 pa_usec_t usec, cusec;
 881
 882                 /* OK, the playback buffer is now full, let's
 883                  * calculate when to wake up next */
 884
 885                 usec = hw_sleep_time(u);
 886
 887                 pa_log_debug("Waking up in %0.2fms (sound card clock).", (double) usec / PA_USEC_PER_MSEC);
 888
 889                 /* Convert from the sound card time domain to the
 890                  * system time domain */
 891                 cusec = pa_smoother_translate(u->smoother, pa_rtclock_usec(), usec);
 892
 893                 pa_log_debug("Waking up in %0.2fms (system clock).", (double) cusec / PA_USEC_PER_MSEC);
 894
 895                 /* We don't trust the conversion, so we wake up whatever comes first */
 896                 pa_rtpoll_set_timer_relative(u->rtpoll, PA_MIN(usec, cusec));
 897             }
 898
 899         } else if (u->use_tsched)
 900
 901             /* OK, we're in an invalid state, let's disable our timers */
 902             pa_rtpoll_set_timer_disabled(u->rtpoll);
 903
 904         /* Hmm, nothing to do. Let's sleep */
 905         if ((ret = pa_rtpoll_run(u->rtpoll, 1)) < 0)
 906             goto fail;
 907
 908         if (ret == 0)
 909             goto finish;
 910
 911         /* Tell ALSA about this and process its response */
 912         if (PA_SINK_OPENED(u->sink->thread_info.state)) {
 913             struct pollfd *pollfd;
 914             unsigned short revents = 0;
 915             int err;
 916             unsigned n;
 917
 918             pollfd = pa_rtpoll_item_get_pollfd(u->alsa_rtpoll_item, &n);
 919
 920             if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, pollfd, n, &revents)) < 0) {
 921                 pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
 922                 goto fail;
 923             }
 924
 925             if (revents & (POLLERR|POLLNVAL|POLLHUP)) {
 926                 snd_pcm_state_t state;
 927
 928                 if (revents & POLLERR)
 929                     pa_log_warn("Got POLLERR from ALSA");
 930                 if (revents & POLLNVAL)
 931                     pa_log_warn("Got POLLNVAL from ALSA");
 932                 if (revents & POLLHUP)
 933                     pa_log_warn("Got POLLHUP from ALSA");
 934
 935                 state = snd_pcm_state(u->pcm_handle);
 936                 pa_log_warn("PCM state is %s", snd_pcm_state_name(state));
 937
 938                 /* Try to recover from this error */
 939
 940                 switch (state) {
 941
 942                     case SND_PCM_STATE_XRUN:
 943                         if ((err = snd_pcm_recover(u->pcm_handle, -EPIPE, 1)) != 0) {
 944                             pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
 945                             goto fail;
 946                         }
 947                         break;
 948
 949                     case SND_PCM_STATE_SUSPENDED:
 950                         if ((err = snd_pcm_recover(u->pcm_handle, -ESTRPIPE, 1)) != 0) {
 951                             pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
 952                             goto fail;
 953                         }
 954                         break;
 955
 956                     default:
 957
 958                         snd_pcm_drop(u->pcm_handle);
 959
 960                         if ((err = snd_pcm_prepare(u->pcm_handle)) < 0) {
 961                             pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
 962                             goto fail;
 963                         }
 964                         break;
 965                 }
 966
 967                 u->first = TRUE;
 968             }
 969
 970             pa_log_debug("alsa revents = %i", revents);
 971         }
 972     }
 973
 974 fail:
 975     /* If this was no regular exit from the loop we have to continue
 976      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 977     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 978     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 979
 980 finish:
 981     pa_log_debug("Thread shutting down");
 982 }
 983
 984 int pa__init(pa_module*m) {
 985
 986     pa_modargs *ma = NULL;
 987     struct userdata *u = NULL;
 988     const char *dev_id;
 989     pa_sample_spec ss;
 990     pa_channel_map map;
 991     uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
 992     snd_pcm_uframes_t period_frames, tsched_frames;
 993     size_t frame_size;
 994     snd_pcm_info_t *pcm_info = NULL;
 995     int err;
 996     const char *name;
 997     char *name_buf = NULL;
 998     pa_bool_t namereg_fail;
 999     pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d;
1000     pa_usec_t usec;
1001     pa_sink_new_data data;
1002     static const char * const class_table[SND_PCM_CLASS_LAST+1] = {
1003         [SND_PCM_CLASS_GENERIC] = "sound",
1004         [SND_PCM_CLASS_MULTI] = NULL,
1005         [SND_PCM_CLASS_MODEM] = "modem",
1006         [SND_PCM_CLASS_DIGITIZER] = NULL
1007     };
1008
1009     snd_pcm_info_alloca(&pcm_info);
1010
1011     pa_assert(m);
1012
1013     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
1014         pa_log("Failed to parse module arguments");
1015         goto fail;
1016     }
1017
1018     ss = m->core->default_sample_spec;
1019     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
1020         pa_log("Failed to parse sample specification and channel map");
1021         goto fail;
1022     }
1023
1024     frame_size = pa_frame_size(&ss);
1025
1026     nfrags = m->core->default_n_fragments;
1027     frag_size = pa_usec_to_bytes(m->core->default_fragment_size_msec*PA_USEC_PER_MSEC, &ss);
1028     if (frag_size <= 0)
1029         frag_size = frame_size;
1030     tsched_size = pa_usec_to_bytes(DEFAULT_TSCHED_BUFFER_USEC, &ss);
1031     tsched_watermark = pa_usec_to_bytes(DEFAULT_TSCHED_WATERMARK_USEC, &ss);
1032
1033     if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 ||
1034         pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0 ||
1035         pa_modargs_get_value_u32(ma, "tsched_buffer_size", &tsched_size) < 0 ||
1036         pa_modargs_get_value_u32(ma, "tsched_buffer_watermark", &tsched_watermark) < 0) {
1037         pa_log("Failed to parse buffer metrics");
1038         goto fail;
1039     }
1040
1041     hwbuf_size = frag_size * nfrags;
1042     period_frames = frag_size/frame_size;
1043     tsched_frames = tsched_size/frame_size;
1044
1045     if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
1046         pa_log("Failed to parse mmap argument.");
1047         goto fail;
1048     }
1049
1050     if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
1051         pa_log("Failed to parse timer_scheduling argument.");
1052         goto fail;
1053     }
1054
1055     if (use_tsched && !pa_rtclock_hrtimer()) {
1056         pa_log("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
1057         use_tsched = FALSE;
1058     }
1059
1060     u = pa_xnew0(struct userdata, 1);
1061     u->core = m->core;
1062     u->module = m;
1063     m->userdata = u;
1064     u->use_mmap = use_mmap;
1065     u->use_tsched = use_tsched;
1066     u->first = TRUE;
1067     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
1068     u->rtpoll = pa_rtpoll_new();
1069     u->alsa_rtpoll_item = NULL;
1070     pa_rtpoll_item_new_asyncmsgq(u->rtpoll, PA_RTPOLL_EARLY, u->thread_mq.inq);
1071
1072     u->smoother = pa_smoother_new(DEFAULT_TSCHED_BUFFER_USEC*2, DEFAULT_TSCHED_BUFFER_USEC*2, TRUE);
1073     usec = pa_rtclock_usec();
1074     pa_smoother_set_time_offset(u->smoother, usec);
1075     pa_smoother_pause(u->smoother, usec);
1076
1077     snd_config_update_free_global();
1078
1079     b = use_mmap;
1080     d = use_tsched;
1081
1082     if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
1083
1084         if (!(u->pcm_handle = pa_alsa_open_by_device_id(
1085                       dev_id,
1086                       &u->device_name,
1087                       &ss, &map,
1088                       SND_PCM_STREAM_PLAYBACK,
1089                       &nfrags, &period_frames, tsched_frames,
1090                       &b, &d)))
1091
1092             goto fail;
1093
1094     } else {
1095
1096         if (!(u->pcm_handle = pa_alsa_open_by_device_string(
1097                       pa_modargs_get_value(ma, "device", DEFAULT_DEVICE),
1098                       &u->device_name,
1099                       &ss, &map,
1100                       SND_PCM_STREAM_PLAYBACK,
1101                       &nfrags, &period_frames, tsched_frames,
1102                       &b, &d)))
1103             goto fail;
1104
1105     }
1106
1107     pa_assert(u->device_name);
1108     pa_log_info("Successfully opened device %s.", u->device_name);
1109
1110     if (use_mmap && !b) {
1111         pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
1112         u->use_mmap = use_mmap = FALSE;
1113     }
1114
1115     if (use_tsched && (!b || !d)) {
1116         pa_log_info("Cannot enabled timer-based scheduling, falling back to sound IRQ scheduling.");
1117         u->use_tsched = use_tsched = FALSE;
1118     }
1119
1120     if (u->use_mmap)
1121         pa_log_info("Successfully enabled mmap() mode.");
1122
1123     if (u->use_tsched)
1124         pa_log_info("Successfully enabled timer-based scheduling mode.");
1125
1126     if ((err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
1127         pa_log("Error fetching PCM info: %s", snd_strerror(err));
1128         goto fail;
1129     }
1130
1131     /* ALSA might tweak the sample spec, so recalculate the frame size */
1132     frame_size = pa_frame_size(&ss);
1133
1134     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
1135         pa_log_warn("Error opening mixer: %s", snd_strerror(err));
1136     else {
1137         pa_bool_t found = FALSE;
1138
1139         if (pa_alsa_prepare_mixer(u->mixer_handle, u->device_name) >= 0)
1140             found = TRUE;
1141         else {
1142             snd_pcm_info_t *info;
1143
1144             snd_pcm_info_alloca(&info);
1145
1146             if (snd_pcm_info(u->pcm_handle, info) >= 0) {
1147                 char *md;
1148                 int card;
1149
1150                 if ((card = snd_pcm_info_get_card(info)) >= 0) {
1151
1152                     md = pa_sprintf_malloc("hw:%i", card);
1153
1154                     if (strcmp(u->device_name, md))
1155                         if (pa_alsa_prepare_mixer(u->mixer_handle, md) >= 0)
1156                             found = TRUE;
1157                     pa_xfree(md);
1158                 }
1159             }
1160         }
1161
1162         if (found)
1163             if (!(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Master", "PCM")))
1164                 found = FALSE;
1165
1166         if (!found) {
1167             snd_mixer_close(u->mixer_handle);
1168             u->mixer_handle = NULL;
1169         }
1170     }
1171
1172     if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
1173         namereg_fail = TRUE;
1174     else {
1175         name = name_buf = pa_sprintf_malloc("alsa_output.%s", u->device_name);
1176         namereg_fail = FALSE;
1177     }
1178
1179     pa_sink_new_data_init(&data);
1180     data.driver = __FILE__;
1181     data.module = m;
1182     pa_sink_new_data_set_name(&data, name);
1183     data.namereg_fail = namereg_fail;
1184     pa_sink_new_data_set_sample_spec(&data, &ss);
1185     pa_sink_new_data_set_channel_map(&data, &map);
1186
1187     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->device_name);
1188     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "alsa");
1189     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, snd_pcm_info_get_name(pcm_info));
1190
1191     if (class_table[snd_pcm_info_get_class(pcm_info)])
1192         pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, class_table[snd_pcm_info_get_class(pcm_info)]);
1193
1194     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_ACCESS_MODE, u->use_tsched ? "mmap_rewrite" : (u->use_mmap ? "mmap" : "serial"));
1195
1196     u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
1197     pa_sink_new_data_done(&data);
1198     pa_xfree(name_buf);
1199
1200     if (!u->sink) {
1201         pa_log("Failed to create sink object");
1202         goto fail;
1203     }
1204
1205     u->sink->parent.process_msg = sink_process_msg;
1206     u->sink->update_requested_latency = sink_update_requested_latency_cb;
1207     u->sink->userdata = u;
1208
1209     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
1210     pa_sink_set_rtpoll(u->sink, u->rtpoll);
1211
1212     u->frame_size = frame_size;
1213     u->fragment_size = frag_size = period_frames * frame_size;
1214     u->nfragments = nfrags;
1215     u->hwbuf_size = u->fragment_size * nfrags;
1216     u->hwbuf_unused_frames = 0;
1217     u->tsched_watermark = tsched_watermark;
1218     u->frame_index = 0;
1219     u->hw_dB_supported = FALSE;
1220     u->hw_dB_min = u->hw_dB_max = 0;
1221     u->hw_volume_min = u->hw_volume_max = 0;
1222
1223     u->sink->thread_info.max_rewind = use_tsched ? u->hwbuf_size : 0;
1224
1225     if (!use_tsched)
1226         u->sink->min_latency = pa_bytes_to_usec(u->hwbuf_size, &ss);
1227
1228     pa_log_info("Using %u fragments of size %lu bytes, buffer time is %0.2fms",
1229                 nfrags, (long unsigned) u->fragment_size,
1230                 (double) pa_bytes_to_usec(u->hwbuf_size, &ss) / PA_USEC_PER_MSEC);
1231
1232     if (use_tsched)
1233         pa_log_info("Time scheduling watermark is %0.2fms",
1234                     (double) pa_bytes_to_usec(u->tsched_watermark, &ss) / PA_USEC_PER_MSEC);
1235
1236     if (update_sw_params(u) < 0)
1237         goto fail;
1238
1239     pa_memchunk_reset(&u->memchunk);
1240
1241     if (u->mixer_handle) {
1242         pa_assert(u->mixer_elem);
1243
1244         if (snd_mixer_selem_has_playback_volume(u->mixer_elem))
1245
1246             if (pa_alsa_calc_mixer_map(u->mixer_elem, &map, u->mixer_map, TRUE) >= 0 &&
1247                 snd_mixer_selem_get_playback_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max) >= 0) {
1248
1249                 pa_bool_t suitable = TRUE;
1250
1251                 pa_log_info("Volume ranges from %li to %li.", u->hw_volume_min, u->hw_volume_max);
1252
1253                 if (u->hw_volume_min > u->hw_volume_max) {
1254
1255                     pa_log_info("Minimal volume %li larger than maximum volume %li. Strange stuff Falling back to software volume control.", u->hw_volume_min, u->hw_volume_max);
1256                     suitable = FALSE;
1257
1258                 } else if (u->hw_volume_max - u->hw_volume_min < 3) {
1259
1260                     pa_log_info("Device has less than 4 volume levels. Falling back to software volume control.");
1261                     suitable = FALSE;
1262
1263                 } else if (snd_mixer_selem_get_playback_dB_range(u->mixer_elem, &u->hw_dB_min, &u->hw_dB_max) >= 0) {
1264
1265                     pa_log_info("Volume ranges from %0.2f dB to %0.2f dB.", u->hw_dB_min/100.0, u->hw_dB_max/100.0);
1266
1267                     /* Let's see if this thing actually is useful for muting */
1268                     if (u->hw_dB_min > -6000) {
1269                         pa_log_info("Device cannot attenuate for more than -60 dB (only %0.2f dB supported), falling back to software volume control.", ((double) u->hw_dB_min) / 100);
1270
1271                         suitable = FALSE;
1272                     } else if (u->hw_dB_max < 0) {
1273
1274                         pa_log_info("Device is still attenuated at maximum volume setting (%0.2f dB is maximum). Strange stuff. Falling back to software volume control.", ((double) u->hw_dB_max) / 100);
1275                         suitable = FALSE;
1276
1277                     } else if (u->hw_dB_min >= u->hw_dB_max) {
1278
1279                         pa_log_info("Minimal dB (%0.2f) larger or equal to maximum dB (%0.2f). Strange stuff. Falling back to software volume control.", ((double) u->hw_dB_min) / 100, ((double) u->hw_dB_max) / 100);
1280                         suitable = FALSE;
1281
1282                     } else {
1283
1284                         if (u->hw_dB_max > 0) {
1285                             /* dB > 0 means overamplification, and clipping, we don't want that here */
1286                             pa_log_info("Device can do overamplification for %0.2f dB. Limiting to 0 db", ((double) u->hw_dB_max) / 100);
1287                             u->hw_dB_max = 0;
1288                         }
1289
1290                         u->hw_dB_supported = TRUE;
1291                     }
1292                 }
1293
1294                 if (suitable) {
1295                     u->sink->get_volume = sink_get_volume_cb;
1296                     u->sink->set_volume = sink_set_volume_cb;
1297                     u->sink->flags |= PA_SINK_HW_VOLUME_CTRL | (u->hw_dB_supported ? PA_SINK_DECIBEL_VOLUME : 0);
1298                     pa_log_info("Using hardware volume control. %s dB scale.", u->hw_dB_supported ? "Using" : "Not using");
1299
1300                 } else {
1301                     pa_log_info("Using software volume control. Trying to reset sound card to 0 dB.");
1302                     pa_alsa_0dB_playback(u->mixer_elem);
1303                 }
1304             }
1305
1306         if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
1307             u->sink->get_mute = sink_get_mute_cb;
1308             u->sink->set_mute = sink_set_mute_cb;
1309             u->sink->flags |= PA_SINK_HW_MUTE_CTRL;
1310         }
1311
1312         u->mixer_fdl = pa_alsa_fdlist_new();
1313
1314         if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, m->core->mainloop) < 0) {
1315             pa_log("Failed to initialize file descriptor monitoring");
1316             goto fail;
1317         }
1318
1319         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
1320         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
1321     } else
1322         u->mixer_fdl = NULL;
1323
1324     pa_alsa_dump(u->pcm_handle);
1325
1326     if (!(u->thread = pa_thread_new(thread_func, u))) {
1327         pa_log("Failed to create thread.");
1328         goto fail;
1329     }
1330
1331     /* Get initial mixer settings */
1332     if (data.volume_is_set) {
1333         if (u->sink->set_volume)
1334             u->sink->set_volume(u->sink);
1335     } else {
1336         if (u->sink->get_volume)
1337             u->sink->get_volume(u->sink);
1338     }
1339
1340     if (data.muted_is_set) {
1341         if (u->sink->set_mute)
1342             u->sink->set_mute(u->sink);
1343     } else {
1344         if (u->sink->get_mute)
1345             u->sink->get_mute(u->sink);
1346     }
1347
1348     pa_sink_put(u->sink);
1349
1350     pa_modargs_free(ma);
1351
1352     return 0;
1353
1354 fail:
1355
1356     if (ma)
1357         pa_modargs_free(ma);
1358
1359     pa__done(m);
1360
1361     return -1;
1362 }
1363
1364 void pa__done(pa_module*m) {
1365     struct userdata *u;
1366
1367     pa_assert(m);
1368
1369     if (!(u = m->userdata))
1370         return;
1371
1372     if (u->sink)
1373         pa_sink_unlink(u->sink);
1374
1375     if (u->thread) {
1376         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
1377         pa_thread_free(u->thread);
1378     }
1379
1380     pa_thread_mq_done(&u->thread_mq);
1381
1382     if (u->sink)
1383         pa_sink_unref(u->sink);
1384
1385     if (u->memchunk.memblock)
1386         pa_memblock_unref(u->memchunk.memblock);
1387
1388     if (u->alsa_rtpoll_item)
1389         pa_rtpoll_item_free(u->alsa_rtpoll_item);
1390
1391     if (u->rtpoll)
1392         pa_rtpoll_free(u->rtpoll);
1393
1394     if (u->mixer_fdl)
1395         pa_alsa_fdlist_free(u->mixer_fdl);
1396
1397     if (u->mixer_handle)
1398         snd_mixer_close(u->mixer_handle);
1399
1400     if (u->pcm_handle) {
1401         snd_pcm_drop(u->pcm_handle);
1402         snd_pcm_close(u->pcm_handle);
1403     }
1404
1405     if (u->smoother)
1406         pa_smoother_free(u->smoother);
1407
1408     pa_xfree(u->device_name);
1409     pa_xfree(u);
1410
1411     snd_config_update_free_global();
1412 }