code.delx.au - pulseaudio/blob - src/pulsecore/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 <stdlib.h>
  30 #include <string.h>
  31 #include <stdio.h>
  32
  33 #include <pulse/introspect.h>
  34 #include <pulse/utf8.h>
  35 #include <pulse/xmalloc.h>
  36 #include <pulse/timeval.h>
  37
  38 #include <pulsecore/sink-input.h>
  39 #include <pulsecore/namereg.h>
  40 #include <pulsecore/core-util.h>
  41 #include <pulsecore/sample-util.h>
  42 #include <pulsecore/core-subscribe.h>
  43 #include <pulsecore/log.h>
  44 #include <pulsecore/macro.h>
  45 #include <pulsecore/play-memblockq.h>
  46
  47 #include "sink.h"
  48
  49 #define MAX_MIX_CHANNELS 32
  50 #define MIX_BUFFER_LENGTH (PA_PAGE_SIZE)
  51 #define DEFAULT_MIN_LATENCY (4*PA_USEC_PER_MSEC)
  52
  53 static PA_DEFINE_CHECK_TYPE(pa_sink, pa_msgobject);
  54
  55 static void sink_free(pa_object *s);
  56
  57 pa_sink_new_data* pa_sink_new_data_init(pa_sink_new_data *data) {
  58     pa_assert(data);
  59
  60     memset(data, 0, sizeof(*data));
  61     data->proplist = pa_proplist_new();
  62
  63     return data;
  64 }
  65
  66 void pa_sink_new_data_set_name(pa_sink_new_data *data, const char *name) {
  67     pa_assert(data);
  68
  69     pa_xfree(data->name);
  70     data->name = pa_xstrdup(name);
  71 }
  72
  73 void pa_sink_new_data_set_sample_spec(pa_sink_new_data *data, const pa_sample_spec *spec) {
  74     pa_assert(data);
  75
  76     if ((data->sample_spec_is_set = !!spec))
  77         data->sample_spec = *spec;
  78 }
  79
  80 void pa_sink_new_data_set_channel_map(pa_sink_new_data *data, const pa_channel_map *map) {
  81     pa_assert(data);
  82
  83     if ((data->channel_map_is_set = !!map))
  84         data->channel_map = *map;
  85 }
  86
  87 void pa_sink_new_data_set_volume(pa_sink_new_data *data, const pa_cvolume *volume) {
  88     pa_assert(data);
  89
  90     if ((data->volume_is_set = !!volume))
  91         data->volume = *volume;
  92 }
  93
  94 void pa_sink_new_data_set_muted(pa_sink_new_data *data, pa_bool_t mute) {
  95     pa_assert(data);
  96
  97     data->muted_is_set = TRUE;
  98     data->muted = !!mute;
  99 }
 100
 101 void pa_sink_new_data_done(pa_sink_new_data *data) {
 102     pa_assert(data);
 103
 104     pa_xfree(data->name);
 105     pa_proplist_free(data->proplist);
 106 }
 107
 108 static void reset_callbacks(pa_sink *s) {
 109     pa_assert(s);
 110
 111     s->set_state = NULL;
 112     s->get_volume = NULL;
 113     s->set_volume = NULL;
 114     s->get_mute = NULL;
 115     s->set_mute = NULL;
 116     s->get_latency = NULL;
 117     s->request_rewind = NULL;
 118     s->update_requested_latency = NULL;
 119 }
 120
 121 pa_sink* pa_sink_new(
 122         pa_core *core,
 123         pa_sink_new_data *data,
 124         pa_sink_flags_t flags) {
 125
 126     pa_sink *s;
 127     char *d;
 128     const char *name;
 129     char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 130     pa_source_new_data source_data;
 131
 132     pa_assert(core);
 133     pa_assert(data);
 134     pa_assert(data->name);
 135
 136     s = pa_msgobject_new(pa_sink);
 137
 138     if (!(name = pa_namereg_register(core, data->name, PA_NAMEREG_SINK, s, data->namereg_fail))) {
 139         pa_xfree(s);
 140         return NULL;
 141     }
 142
 143     pa_sink_new_data_set_name(data, name);
 144
 145     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_NEW], data) < 0) {
 146         pa_xfree(s);
 147         pa_namereg_unregister(core, name);
 148         return NULL;
 149     }
 150
 151     pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
 152     pa_return_null_if_fail(data->name && pa_utf8_valid(data->name) && data->name[0]);
 153
 154     pa_return_null_if_fail(data->sample_spec_is_set && pa_sample_spec_valid(&data->sample_spec));
 155
 156     if (!data->channel_map_is_set)
 157         pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));
 158
 159     pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
 160     pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);
 161
 162     if (!data->volume_is_set)
 163         pa_cvolume_reset(&data->volume, data->sample_spec.channels);
 164
 165     pa_return_null_if_fail(pa_cvolume_valid(&data->volume));
 166     pa_return_null_if_fail(data->volume.channels == data->sample_spec.channels);
 167
 168     if (!data->muted_is_set)
 169         data->muted = FALSE;
 170
 171     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_FIXATE], data) < 0) {
 172         pa_xfree(s);
 173         pa_namereg_unregister(core, name);
 174         return NULL;
 175     }
 176
 177     s->parent.parent.free = sink_free;
 178     s->parent.process_msg = pa_sink_process_msg;
 179
 180     s->core = core;
 181     s->state = PA_SINK_INIT;
 182     s->flags = flags;
 183     s->name = pa_xstrdup(name);
 184     s->proplist = pa_proplist_copy(data->proplist);
 185     s->driver = pa_xstrdup(data->driver);
 186     s->module = data->module;
 187
 188     s->sample_spec = data->sample_spec;
 189     s->channel_map = data->channel_map;
 190
 191     s->inputs = pa_idxset_new(NULL, NULL);
 192     s->n_corked = 0;
 193
 194     s->volume = data->volume;
 195     s->muted = data->muted;
 196     s->refresh_volume = s->refresh_mute = FALSE;
 197
 198     reset_callbacks(s);
 199     s->userdata = NULL;
 200
 201     s->asyncmsgq = NULL;
 202     s->rtpoll = NULL;
 203
 204     pa_silence_memchunk_get(
 205             &core->silence_cache,
 206             core->mempool,
 207             &s->silence,
 208             &s->sample_spec,
 209             0);
 210
 211     s->min_latency = DEFAULT_MIN_LATENCY;
 212     s->max_latency = s->min_latency;
 213
 214     s->thread_info.inputs = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 215     s->thread_info.soft_volume = s->volume;
 216     s->thread_info.soft_muted = s->muted;
 217     s->thread_info.state = s->state;
 218     s->thread_info.rewind_nbytes = 0;
 219     s->thread_info.max_rewind = 0;
 220     s->thread_info.requested_latency_valid = TRUE;
 221     s->thread_info.requested_latency = 0;
 222
 223     pa_assert_se(pa_idxset_put(core->sinks, s, &s->index) >= 0);
 224
 225     pa_log_info("Created sink %u \"%s\" with sample spec %s and channel map %s",
 226                 s->index,
 227                 s->name,
 228                 pa_sample_spec_snprint(st, sizeof(st), &s->sample_spec),
 229                 pa_channel_map_snprint(cm, sizeof(cm), &s->channel_map));
 230
 231     pa_source_new_data_init(&source_data);
 232     pa_source_new_data_set_sample_spec(&source_data, &s->sample_spec);
 233     pa_source_new_data_set_channel_map(&source_data, &s->channel_map);
 234     source_data.name = pa_sprintf_malloc("%s.monitor", name);
 235     source_data.driver = data->driver;
 236     source_data.module = data->module;
 237
 238     d = pa_sprintf_malloc("Monitor Source of %s", s->name);
 239     pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_DESCRIPTION, d);
 240     pa_xfree(d);
 241     pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_CLASS, "monitor");
 242
 243     s->monitor_source = pa_source_new(core, &source_data, 0);
 244
 245     pa_source_new_data_done(&source_data);
 246
 247     if (!s->monitor_source) {
 248         pa_sink_unlink(s);
 249         pa_sink_unref(s);
 250         return NULL;
 251     }
 252
 253     s->monitor_source->monitor_of = s;
 254     pa_source_set_max_rewind(s->monitor_source, s->thread_info.max_rewind);
 255
 256     return s;
 257 }
 258
 259 static int sink_set_state(pa_sink *s, pa_sink_state_t state) {
 260     int ret;
 261     pa_bool_t suspend_change;
 262
 263     pa_assert(s);
 264
 265     if (s->state == state)
 266         return 0;
 267
 268     suspend_change =
 269         (s->state == PA_SINK_SUSPENDED && PA_SINK_OPENED(state)) ||
 270         (PA_SINK_OPENED(s->state) && state == PA_SINK_SUSPENDED);
 271
 272     if (s->set_state)
 273         if ((ret = s->set_state(s, state)) < 0)
 274             return -1;
 275
 276     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) < 0)
 277         return -1;
 278
 279     s->state = state;
 280
 281     if (suspend_change) {
 282         pa_sink_input *i;
 283         uint32_t idx;
 284
 285         /* We're suspending or resuming, tell everyone about it */
 286
 287         for (i = PA_SINK_INPUT(pa_idxset_first(s->inputs, &idx)); i; i = PA_SINK_INPUT(pa_idxset_next(s->inputs, &idx)))
 288             if (i->suspend)
 289                 i->suspend(i, state == PA_SINK_SUSPENDED);
 290     }
 291
 292     if (state != PA_SINK_UNLINKED) /* if we enter UNLINKED state pa_sink_unlink() will fire the apropriate events */
 293         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_STATE_CHANGED], s);
 294
 295     return 0;
 296 }
 297
 298 void pa_sink_put(pa_sink* s) {
 299     pa_sink_assert_ref(s);
 300
 301     pa_assert(s->state == PA_SINK_INIT);
 302     pa_assert(s->asyncmsgq);
 303     pa_assert(s->rtpoll);
 304
 305     pa_assert(!s->min_latency || !s->max_latency || s->min_latency <= s->max_latency);
 306
 307     if (!(s->flags & PA_SINK_HW_VOLUME_CTRL))
 308         s->flags |= PA_SINK_DECIBEL_VOLUME;
 309
 310     pa_assert_se(sink_set_state(s, PA_SINK_IDLE) == 0);
 311
 312     pa_source_put(s->monitor_source);
 313
 314     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_NEW, s->index);
 315     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PUT], s);
 316 }
 317
 318 void pa_sink_unlink(pa_sink* s) {
 319     pa_bool_t linked;
 320     pa_sink_input *i, *j = NULL;
 321
 322     pa_assert(s);
 323
 324     /* Please note that pa_sink_unlink() does more than simply
 325      * reversing pa_sink_put(). It also undoes the registrations
 326      * already done in pa_sink_new()! */
 327
 328     /* All operations here shall be idempotent, i.e. pa_sink_unlink()
 329      * may be called multiple times on the same sink without bad
 330      * effects. */
 331
 332     linked = PA_SINK_LINKED(s->state);
 333
 334     if (linked)
 335         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_UNLINK], s);
 336
 337     if (s->state != PA_SINK_UNLINKED)
 338         pa_namereg_unregister(s->core, s->name);
 339     pa_idxset_remove_by_data(s->core->sinks, s, NULL);
 340
 341     while ((i = pa_idxset_first(s->inputs, NULL))) {
 342         pa_assert(i != j);
 343         pa_sink_input_kill(i);
 344         j = i;
 345     }
 346
 347     if (linked)
 348         sink_set_state(s, PA_SINK_UNLINKED);
 349     else
 350         s->state = PA_SINK_UNLINKED;
 351
 352     reset_callbacks(s);
 353
 354     if (s->monitor_source)
 355         pa_source_unlink(s->monitor_source);
 356
 357     if (linked) {
 358         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_REMOVE, s->index);
 359         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_UNLINK_POST], s);
 360     }
 361 }
 362
 363 static void sink_free(pa_object *o) {
 364     pa_sink *s = PA_SINK(o);
 365     pa_sink_input *i;
 366
 367     pa_assert(s);
 368     pa_assert(pa_sink_refcnt(s) == 0);
 369
 370     if (PA_SINK_LINKED(s->state))
 371         pa_sink_unlink(s);
 372
 373     pa_log_info("Freeing sink %u \"%s\"", s->index, s->name);
 374
 375     if (s->monitor_source) {
 376         pa_source_unref(s->monitor_source);
 377         s->monitor_source = NULL;
 378     }
 379
 380     pa_idxset_free(s->inputs, NULL, NULL);
 381
 382     while ((i = pa_hashmap_steal_first(s->thread_info.inputs)))
 383         pa_sink_input_unref(i);
 384
 385     pa_hashmap_free(s->thread_info.inputs, NULL, NULL);
 386
 387     if (s->silence.memblock)
 388         pa_memblock_unref(s->silence.memblock);
 389
 390     pa_xfree(s->name);
 391     pa_xfree(s->driver);
 392
 393     if (s->proplist)
 394         pa_proplist_free(s->proplist);
 395
 396     pa_xfree(s);
 397 }
 398
 399 void pa_sink_set_asyncmsgq(pa_sink *s, pa_asyncmsgq *q) {
 400     pa_sink_assert_ref(s);
 401     pa_assert(q);
 402
 403     s->asyncmsgq = q;
 404
 405     if (s->monitor_source)
 406         pa_source_set_asyncmsgq(s->monitor_source, q);
 407 }
 408
 409 void pa_sink_set_rtpoll(pa_sink *s, pa_rtpoll *p) {
 410     pa_sink_assert_ref(s);
 411     pa_assert(p);
 412
 413     s->rtpoll = p;
 414     if (s->monitor_source)
 415         pa_source_set_rtpoll(s->monitor_source, p);
 416 }
 417
 418 int pa_sink_update_status(pa_sink*s) {
 419     pa_sink_assert_ref(s);
 420     pa_assert(PA_SINK_LINKED(s->state));
 421
 422     if (s->state == PA_SINK_SUSPENDED)
 423         return 0;
 424
 425     return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 426 }
 427
 428 int pa_sink_suspend(pa_sink *s, pa_bool_t suspend) {
 429     pa_sink_assert_ref(s);
 430     pa_assert(PA_SINK_LINKED(s->state));
 431
 432     if (suspend)
 433         return sink_set_state(s, PA_SINK_SUSPENDED);
 434     else
 435         return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 436 }
 437
 438 void pa_sink_process_rewind(pa_sink *s, size_t nbytes) {
 439     pa_sink_input *i;
 440     void *state = NULL;
 441     pa_sink_assert_ref(s);
 442     pa_assert(PA_SINK_LINKED(s->state));
 443
 444     if (nbytes <= 0)
 445         return;
 446
 447     pa_log_debug("Processing rewind...");
 448
 449     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 450         pa_sink_input_assert_ref(i);
 451         pa_sink_input_process_rewind(i, nbytes);
 452     }
 453
 454     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 455         pa_source_process_rewind(s->monitor_source, nbytes);
 456 }
 457
 458 static unsigned fill_mix_info(pa_sink *s, size_t *length, pa_mix_info *info, unsigned maxinfo) {
 459     pa_sink_input *i;
 460     unsigned n = 0;
 461     void *state = NULL;
 462     size_t mixlength = *length;
 463
 464     pa_sink_assert_ref(s);
 465     pa_assert(info);
 466
 467     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)) && maxinfo > 0) {
 468         pa_sink_input_assert_ref(i);
 469
 470         if (pa_sink_input_peek(i, *length, &info->chunk, &info->volume) < 0)
 471             continue;
 472
 473         if (mixlength == 0 || info->chunk.length < mixlength)
 474             mixlength = info->chunk.length;
 475
 476         if (pa_memblock_is_silence(info->chunk.memblock)) {
 477             pa_memblock_unref(info->chunk.memblock);
 478             continue;
 479         }
 480
 481         info->userdata = pa_sink_input_ref(i);
 482
 483         pa_assert(info->chunk.memblock);
 484         pa_assert(info->chunk.length > 0);
 485
 486         info++;
 487         n++;
 488         maxinfo--;
 489     }
 490
 491     if (mixlength > 0)
 492         *length = mixlength;
 493
 494     return n;
 495 }
 496
 497 static void inputs_drop(pa_sink *s, pa_mix_info *info, unsigned n, size_t length) {
 498     pa_sink_input *i;
 499     void *state = NULL;
 500     unsigned p = 0;
 501     unsigned n_unreffed = 0;
 502
 503     pa_sink_assert_ref(s);
 504
 505     /* We optimize for the case where the order of the inputs has not changed */
 506
 507     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 508         unsigned j;
 509         pa_mix_info* m;
 510
 511         pa_sink_input_assert_ref(i);
 512
 513         m = NULL;
 514
 515         /* Let's try to find the matching entry info the pa_mix_info array */
 516         for (j = 0; j < n; j ++) {
 517
 518             if (info[p].userdata == i) {
 519                 m = info + p;
 520                 break;
 521             }
 522
 523             p++;
 524             if (p >= n)
 525                 p = 0;
 526         }
 527
 528         /* Drop read data */
 529         pa_sink_input_drop(i, length);
 530
 531         if (m) {
 532             pa_sink_input_unref(m->userdata);
 533             m->userdata = NULL;
 534             if (m->chunk.memblock)
 535                 pa_memblock_unref(m->chunk.memblock);
 536             pa_memchunk_reset(&m->chunk);
 537
 538             n_unreffed += 1;
 539         }
 540     }
 541
 542     /* Now drop references to entries that are included in the
 543      * pa_mix_info array but don't exist anymore */
 544
 545     if (n_unreffed < n) {
 546         for (; n > 0; info++, n--) {
 547             if (info->userdata)
 548                 pa_sink_input_unref(info->userdata);
 549             if (info->chunk.memblock)
 550                 pa_memblock_unref(info->chunk.memblock);
 551         }
 552     }
 553 }
 554
 555 void pa_sink_render(pa_sink*s, size_t length, pa_memchunk *result) {
 556     pa_mix_info info[MAX_MIX_CHANNELS];
 557     unsigned n;
 558     size_t block_size_max;
 559
 560     pa_sink_assert_ref(s);
 561     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 562     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 563     pa_assert(result);
 564
 565     pa_sink_ref(s);
 566
 567     s->thread_info.rewind_nbytes = 0;
 568
 569     if (length <= 0)
 570         length = pa_frame_align(MIX_BUFFER_LENGTH, &s->sample_spec);
 571
 572     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 573     if (length > block_size_max)
 574         length = pa_frame_align(block_size_max, &s->sample_spec);
 575
 576     pa_assert(length > 0);
 577
 578     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 579
 580     if (n == 0) {
 581
 582         *result = s->silence;
 583         pa_memblock_ref(result->memblock);
 584
 585         if (result->length > length)
 586             result->length = length;
 587
 588     } else if (n == 1) {
 589         pa_cvolume volume;
 590
 591         *result = info[0].chunk;
 592         pa_memblock_ref(result->memblock);
 593
 594         if (result->length > length)
 595             result->length = length;
 596
 597         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 598
 599         if (s->thread_info.soft_muted || !pa_cvolume_is_norm(&volume)) {
 600             pa_log("adjusting volume ");
 601             pa_memchunk_make_writable(result, 0);
 602             if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 603                 pa_silence_memchunk(result, &s->sample_spec);
 604             else
 605                 pa_volume_memchunk(result, &s->sample_spec, &volume);
 606         }
 607     } else {
 608         void *ptr;
 609         result->memblock = pa_memblock_new(s->core->mempool, length);
 610
 611         ptr = pa_memblock_acquire(result->memblock);
 612         result->length = pa_mix(info, n,
 613                                 ptr, length,
 614                                 &s->sample_spec,
 615                                 &s->thread_info.soft_volume,
 616                                 s->thread_info.soft_muted);
 617         pa_memblock_release(result->memblock);
 618
 619         result->index = 0;
 620     }
 621
 622     if (s->thread_info.state == PA_SINK_RUNNING)
 623         inputs_drop(s, info, n, result->length);
 624
 625     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 626         pa_source_post(s->monitor_source, result);
 627
 628     pa_sink_unref(s);
 629 }
 630
 631 void pa_sink_render_into(pa_sink*s, pa_memchunk *target) {
 632     pa_mix_info info[MAX_MIX_CHANNELS];
 633     unsigned n;
 634     size_t length, block_size_max;
 635
 636     pa_sink_assert_ref(s);
 637     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 638     pa_assert(target);
 639     pa_assert(target->memblock);
 640     pa_assert(target->length > 0);
 641     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 642
 643     pa_sink_ref(s);
 644
 645     s->thread_info.rewind_nbytes = 0;
 646
 647     length = target->length;
 648     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 649     if (length > block_size_max)
 650         length = pa_frame_align(block_size_max, &s->sample_spec);
 651
 652     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 653
 654     if (n == 0) {
 655         if (target->length > length)
 656             target->length = length;
 657
 658         pa_silence_memchunk(target, &s->sample_spec);
 659     } else if (n == 1) {
 660         pa_cvolume volume;
 661
 662         if (target->length > length)
 663             target->length = length;
 664
 665         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 666
 667         if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 668             pa_silence_memchunk(target, &s->sample_spec);
 669         else {
 670             pa_memchunk vchunk;
 671
 672             vchunk = info[0].chunk;
 673             pa_memblock_ref(vchunk.memblock);
 674
 675             if (vchunk.length > target->length)
 676                 vchunk.length = target->length;
 677
 678             if (!pa_cvolume_is_norm(&volume)) {
 679                 pa_memchunk_make_writable(&vchunk, 0);
 680                 pa_volume_memchunk(&vchunk, &s->sample_spec, &volume);
 681             }
 682
 683             pa_memchunk_memcpy(target, &vchunk);
 684             pa_memblock_unref(vchunk.memblock);
 685         }
 686
 687     } else {
 688         void *ptr;
 689
 690         ptr = pa_memblock_acquire(target->memblock);
 691
 692         target->length = pa_mix(info, n,
 693                                 (uint8_t*) ptr + target->index, length,
 694                                 &s->sample_spec,
 695                                 &s->thread_info.soft_volume,
 696                                 s->thread_info.soft_muted);
 697
 698         pa_memblock_release(target->memblock);
 699     }
 700
 701     if (s->thread_info.state == PA_SINK_RUNNING)
 702         inputs_drop(s, info, n, target->length);
 703
 704     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 705         pa_source_post(s->monitor_source, target);
 706
 707     pa_sink_unref(s);
 708 }
 709
 710 void pa_sink_render_into_full(pa_sink *s, pa_memchunk *target) {
 711     pa_memchunk chunk;
 712     size_t l, d;
 713
 714     pa_sink_assert_ref(s);
 715     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 716     pa_assert(target);
 717     pa_assert(target->memblock);
 718     pa_assert(target->length > 0);
 719     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 720
 721     pa_sink_ref(s);
 722
 723     s->thread_info.rewind_nbytes = 0;
 724
 725     l = target->length;
 726     d = 0;
 727     while (l > 0) {
 728         chunk = *target;
 729         chunk.index += d;
 730         chunk.length -= d;
 731
 732         pa_sink_render_into(s, &chunk);
 733
 734         d += chunk.length;
 735         l -= chunk.length;
 736     }
 737
 738     pa_sink_unref(s);
 739 }
 740
 741 void pa_sink_render_full(pa_sink *s, size_t length, pa_memchunk *result) {
 742     pa_sink_assert_ref(s);
 743     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 744     pa_assert(length > 0);
 745     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 746     pa_assert(result);
 747
 748     s->thread_info.rewind_nbytes = 0;
 749
 750     /*** This needs optimization ***/
 751
 752     result->index = 0;
 753     result->length = length;
 754     result->memblock = pa_memblock_new(s->core->mempool, length);
 755
 756     pa_sink_render_into_full(s, result);
 757 }
 758
 759 void pa_sink_skip(pa_sink *s, size_t length) {
 760     pa_sink_input *i;
 761     void *state = NULL;
 762
 763     pa_sink_assert_ref(s);
 764     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 765     pa_assert(length > 0);
 766     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 767
 768     s->thread_info.rewind_nbytes = 0;
 769
 770     if (pa_source_used_by(s->monitor_source)) {
 771         pa_memchunk chunk;
 772
 773         /* If something is connected to our monitor source, we have to
 774          * pass valid data to it */
 775
 776         while (length > 0) {
 777             pa_sink_render(s, length, &chunk);
 778             pa_memblock_unref(chunk.memblock);
 779
 780             pa_assert(chunk.length <= length);
 781             length -= chunk.length;
 782         }
 783
 784     } else {
 785         /* Ok, noone cares about the rendered data, so let's not even render it */
 786
 787         while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 788             pa_sink_input_assert_ref(i);
 789             pa_sink_input_drop(i, length);
 790         }
 791     }
 792 }
 793
 794 pa_usec_t pa_sink_get_latency(pa_sink *s) {
 795     pa_usec_t usec = 0;
 796
 797     pa_sink_assert_ref(s);
 798     pa_assert(PA_SINK_LINKED(s->state));
 799
 800     /* The returned value is supposed to be in the time domain of the sound card! */
 801
 802     if (!PA_SINK_OPENED(s->state))
 803         return 0;
 804
 805     if (s->get_latency)
 806         return s->get_latency(s);
 807
 808     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_LATENCY, &usec, 0, NULL) < 0)
 809         return 0;
 810
 811     return usec;
 812 }
 813
 814 void pa_sink_set_volume(pa_sink *s, const pa_cvolume *volume) {
 815     int changed;
 816
 817     pa_sink_assert_ref(s);
 818     pa_assert(PA_SINK_LINKED(s->state));
 819     pa_assert(volume);
 820
 821     changed = !pa_cvolume_equal(volume, &s->volume);
 822     s->volume = *volume;
 823
 824     if (s->set_volume && s->set_volume(s) < 0)
 825         s->set_volume = NULL;
 826
 827     if (!s->set_volume)
 828         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_VOLUME, pa_xnewdup(struct pa_cvolume, volume, 1), 0, NULL, pa_xfree);
 829
 830     if (changed)
 831         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 832 }
 833
 834 const pa_cvolume *pa_sink_get_volume(pa_sink *s) {
 835     struct pa_cvolume old_volume;
 836
 837     pa_sink_assert_ref(s);
 838     pa_assert(PA_SINK_LINKED(s->state));
 839
 840     old_volume = s->volume;
 841
 842     if (s->get_volume && s->get_volume(s) < 0)
 843         s->get_volume = NULL;
 844
 845     if (!s->get_volume && s->refresh_volume)
 846         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_VOLUME, &s->volume, 0, NULL);
 847
 848     if (!pa_cvolume_equal(&old_volume, &s->volume))
 849         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 850
 851     return &s->volume;
 852 }
 853
 854 void pa_sink_set_mute(pa_sink *s, pa_bool_t mute) {
 855     int changed;
 856
 857     pa_sink_assert_ref(s);
 858     pa_assert(PA_SINK_LINKED(s->state));
 859
 860     changed = s->muted != mute;
 861     s->muted = mute;
 862
 863     if (s->set_mute && s->set_mute(s) < 0)
 864         s->set_mute = NULL;
 865
 866     if (!s->set_mute)
 867         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
 868
 869     if (changed)
 870         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 871 }
 872
 873 pa_bool_t pa_sink_get_mute(pa_sink *s) {
 874     pa_bool_t old_muted;
 875
 876     pa_sink_assert_ref(s);
 877     pa_assert(PA_SINK_LINKED(s->state));
 878
 879     old_muted = s->muted;
 880
 881     if (s->get_mute && s->get_mute(s) < 0)
 882         s->get_mute = NULL;
 883
 884     if (!s->get_mute && s->refresh_mute)
 885         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_MUTE, &s->muted, 0, NULL);
 886
 887     if (old_muted != s->muted)
 888         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 889
 890     return s->muted;
 891 }
 892
 893 void pa_sink_set_description(pa_sink *s, const char *description) {
 894     const char *old;
 895     pa_sink_assert_ref(s);
 896
 897     if (!description && !pa_proplist_contains(s->proplist, PA_PROP_DEVICE_DESCRIPTION))
 898         return;
 899
 900     old = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 901
 902     if (old && description && !strcmp(old, description))
 903         return;
 904
 905     if (description)
 906         pa_proplist_sets(s->proplist, PA_PROP_DEVICE_DESCRIPTION, description);
 907     else
 908         pa_proplist_unset(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 909
 910     if (s->monitor_source) {
 911         char *n;
 912
 913         n = pa_sprintf_malloc("Monitor Source of %s", description ? description : s->name);
 914         pa_source_set_description(s->monitor_source, n);
 915         pa_xfree(n);
 916     }
 917
 918     if (PA_SINK_LINKED(s->state)) {
 919         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 920         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PROPLIST_CHANGED], s);
 921     }
 922 }
 923
 924 unsigned pa_sink_linked_by(pa_sink *s) {
 925     unsigned ret;
 926
 927     pa_sink_assert_ref(s);
 928     pa_assert(PA_SINK_LINKED(s->state));
 929
 930     ret = pa_idxset_size(s->inputs);
 931
 932     /* We add in the number of streams connected to us here. Please
 933      * not the asymmmetry to pa_sink_used_by()! */
 934
 935     if (s->monitor_source)
 936         ret += pa_source_linked_by(s->monitor_source);
 937
 938     return ret;
 939 }
 940
 941 unsigned pa_sink_used_by(pa_sink *s) {
 942     unsigned ret;
 943
 944     pa_sink_assert_ref(s);
 945     pa_assert(PA_SINK_LINKED(s->state));
 946
 947     ret = pa_idxset_size(s->inputs);
 948     pa_assert(ret >= s->n_corked);
 949
 950     /* Streams connected to our monitor source do not matter for
 951      * pa_sink_used_by()!.*/
 952
 953     return ret - s->n_corked;
 954 }
 955
 956 int pa_sink_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
 957     pa_sink *s = PA_SINK(o);
 958     pa_sink_assert_ref(s);
 959     pa_assert(s->thread_info.state != PA_SINK_UNLINKED);
 960
 961     switch ((pa_sink_message_t) code) {
 962
 963         case PA_SINK_MESSAGE_ADD_INPUT: {
 964             pa_sink_input *i = PA_SINK_INPUT(userdata);
 965
 966             pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index), pa_sink_input_ref(i));
 967
 968             /* Since the caller sleeps in pa_sink_input_put(), we can
 969              * safely access data outside of thread_info even though
 970              * it is mutable */
 971
 972             if ((i->thread_info.sync_prev = i->sync_prev)) {
 973                 pa_assert(i->sink == i->thread_info.sync_prev->sink);
 974                 pa_assert(i->sync_prev->sync_next == i);
 975                 i->thread_info.sync_prev->thread_info.sync_next = i;
 976             }
 977
 978             if ((i->thread_info.sync_next = i->sync_next)) {
 979                 pa_assert(i->sink == i->thread_info.sync_next->sink);
 980                 pa_assert(i->sync_next->sync_prev == i);
 981                 i->thread_info.sync_next->thread_info.sync_prev = i;
 982             }
 983
 984             pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
 985
 986             pa_assert(!i->thread_info.attached);
 987             i->thread_info.attached = TRUE;
 988
 989             if (i->attach)
 990                 i->attach(i);
 991
 992             /* If you change anything here, make sure to change the
 993              * ghost sink input handling a few lines down at
 994              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
 995
 996             pa_sink_invalidate_requested_latency(s);
 997
 998             /* Make sure we're not rewound when the hw buffer is remixed and request a remix*/
 999             i->thread_info.ignore_rewind = TRUE;
1000             i->thread_info.since_underrun = 0;
1001             pa_sink_request_rewind(s, 0);
1002
1003             return 0;
1004         }
1005
1006         case PA_SINK_MESSAGE_REMOVE_INPUT: {
1007             pa_sink_input *i = PA_SINK_INPUT(userdata);
1008
1009             /* If you change anything here, make sure to change the
1010              * sink input handling a few lines down at
1011              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
1012
1013             if (i->detach)
1014                 i->detach(i);
1015
1016             pa_assert(i->thread_info.attached);
1017             i->thread_info.attached = FALSE;
1018
1019             /* Since the caller sleeps in pa_sink_input_unlink(),
1020              * we can safely access data outside of thread_info even
1021              * though it is mutable */
1022
1023             pa_assert(!i->thread_info.sync_prev);
1024             pa_assert(!i->thread_info.sync_next);
1025
1026             if (i->thread_info.sync_prev) {
1027                 i->thread_info.sync_prev->thread_info.sync_next = i->thread_info.sync_prev->sync_next;
1028                 i->thread_info.sync_prev = NULL;
1029             }
1030
1031             if (i->thread_info.sync_next) {
1032                 i->thread_info.sync_next->thread_info.sync_prev = i->thread_info.sync_next->sync_prev;
1033                 i->thread_info.sync_next = NULL;
1034             }
1035
1036             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index)))
1037                 pa_sink_input_unref(i);
1038
1039             pa_sink_invalidate_requested_latency(s);
1040
1041             pa_sink_request_rewind(s, 0);
1042
1043             return 0;
1044         }
1045
1046         case PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER: {
1047             pa_sink_input_move_info *info = userdata;
1048             int volume_is_norm;
1049
1050             /* We don't support moving synchronized streams. */
1051             pa_assert(!info->sink_input->sync_prev);
1052             pa_assert(!info->sink_input->sync_next);
1053             pa_assert(!info->sink_input->thread_info.sync_next);
1054             pa_assert(!info->sink_input->thread_info.sync_prev);
1055
1056             if (info->sink_input->detach)
1057                 info->sink_input->detach(info->sink_input);
1058
1059             pa_assert(info->sink_input->thread_info.attached);
1060             info->sink_input->thread_info.attached = FALSE;
1061             pa_sink_invalidate_requested_latency(info->sink_input->sink);
1062
1063             if (info->ghost_sink_input) {
1064                 pa_assert(info->buffer_bytes > 0);
1065                 pa_assert(info->buffer);
1066
1067                 volume_is_norm = pa_cvolume_is_norm(&info->sink_input->thread_info.volume);
1068
1069                 pa_log_debug("Buffering %lu bytes ...", (unsigned long) info->buffer_bytes);
1070
1071                 while (info->buffer_bytes > 0) {
1072                     pa_memchunk memchunk;
1073                     pa_cvolume volume;
1074                     size_t n;
1075
1076                     if (pa_sink_input_peek(info->sink_input, info->buffer_bytes, &memchunk, &volume) < 0)
1077                         break;
1078
1079                     n = memchunk.length > info->buffer_bytes ? info->buffer_bytes : memchunk.length;
1080                     pa_sink_input_drop(info->sink_input, n);
1081                     memchunk.length = n;
1082
1083                     if (!volume_is_norm) {
1084                         pa_memchunk_make_writable(&memchunk, 0);
1085                         pa_volume_memchunk(&memchunk, &s->sample_spec, &volume);
1086                     }
1087
1088                     if (pa_memblockq_push(info->buffer, &memchunk) < 0) {
1089                         pa_memblock_unref(memchunk.memblock);
1090                         break;
1091                     }
1092
1093                     pa_memblock_unref(memchunk.memblock);
1094                     info->buffer_bytes -= n;
1095                 }
1096
1097                 /* Add the remaining already resampled chunks to the buffer */
1098                 pa_memblockq_splice(info->buffer, info->sink_input->thread_info.render_memblockq);
1099
1100                 pa_memblockq_sink_input_set_queue(info->ghost_sink_input, info->buffer);
1101
1102                 pa_log_debug("Buffered %lu bytes ...", (unsigned long) pa_memblockq_get_length(info->buffer));
1103             }
1104
1105             /* Let's remove the sink input ...*/
1106             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(info->sink_input->index)))
1107                 pa_sink_input_unref(info->sink_input);
1108
1109             /* .. and add the ghost sink input instead */
1110             if (info->ghost_sink_input) {
1111                 pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(info->ghost_sink_input->index), pa_sink_input_ref(info->ghost_sink_input));
1112                 info->ghost_sink_input->thread_info.sync_prev = info->ghost_sink_input->thread_info.sync_next = NULL;
1113
1114                 pa_sink_input_update_max_rewind(info->ghost_sink_input, s->thread_info.max_rewind);
1115
1116                 pa_assert(!info->ghost_sink_input->thread_info.attached);
1117                 info->ghost_sink_input->thread_info.attached = TRUE;
1118
1119                 if (info->ghost_sink_input->attach)
1120                     info->ghost_sink_input->attach(info->ghost_sink_input);
1121
1122             }
1123
1124             pa_sink_invalidate_requested_latency(s);
1125
1126             pa_sink_request_rewind(s, 0);
1127
1128             return 0;
1129         }
1130
1131         case PA_SINK_MESSAGE_SET_VOLUME:
1132             s->thread_info.soft_volume = *((pa_cvolume*) userdata);
1133
1134             pa_sink_request_rewind(s, 0);
1135             return 0;
1136
1137         case PA_SINK_MESSAGE_SET_MUTE:
1138             s->thread_info.soft_muted = PA_PTR_TO_UINT(userdata);
1139
1140             pa_sink_request_rewind(s, 0);
1141             return 0;
1142
1143         case PA_SINK_MESSAGE_GET_VOLUME:
1144             *((pa_cvolume*) userdata) = s->thread_info.soft_volume;
1145             return 0;
1146
1147         case PA_SINK_MESSAGE_GET_MUTE:
1148             *((pa_bool_t*) userdata) = s->thread_info.soft_muted;
1149             return 0;
1150
1151         case PA_SINK_MESSAGE_SET_STATE:
1152
1153             s->thread_info.state = PA_PTR_TO_UINT(userdata);
1154             return 0;
1155
1156         case PA_SINK_MESSAGE_DETACH:
1157
1158             /* We're detaching all our input streams so that the
1159              * asyncmsgq and rtpoll fields can be changed without
1160              * problems */
1161             pa_sink_detach_within_thread(s);
1162             return 0;
1163
1164         case PA_SINK_MESSAGE_ATTACH:
1165
1166             /* Reattach all streams */
1167             pa_sink_attach_within_thread(s);
1168             return 0;
1169
1170         case PA_SINK_MESSAGE_GET_REQUESTED_LATENCY: {
1171
1172             pa_usec_t *usec = userdata;
1173             *usec = pa_sink_get_requested_latency_within_thread(s);
1174             return 0;
1175         }
1176
1177         case PA_SINK_MESSAGE_GET_LATENCY:
1178         case PA_SINK_MESSAGE_MAX:
1179             ;
1180     }
1181
1182     return -1;
1183 }
1184
1185 int pa_sink_suspend_all(pa_core *c, pa_bool_t suspend) {
1186     pa_sink *sink;
1187     uint32_t idx;
1188     int ret = 0;
1189
1190     pa_core_assert_ref(c);
1191
1192     for (sink = PA_SINK(pa_idxset_first(c->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(c->sinks, &idx)))
1193         ret -= pa_sink_suspend(sink, suspend) < 0;
1194
1195     return ret;
1196 }
1197
1198 void pa_sink_detach(pa_sink *s) {
1199     pa_sink_assert_ref(s);
1200     pa_assert(PA_SINK_LINKED(s->state));
1201
1202     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_DETACH, NULL, 0, NULL);
1203 }
1204
1205 void pa_sink_attach(pa_sink *s) {
1206     pa_sink_assert_ref(s);
1207     pa_assert(PA_SINK_LINKED(s->state));
1208
1209     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_ATTACH, NULL, 0, NULL);
1210 }
1211
1212 void pa_sink_detach_within_thread(pa_sink *s) {
1213     pa_sink_input *i;
1214     void *state = NULL;
1215
1216     pa_sink_assert_ref(s);
1217     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1218
1219     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1220         if (i->detach)
1221             i->detach(i);
1222
1223     if (s->monitor_source)
1224         pa_source_detach_within_thread(s->monitor_source);
1225 }
1226
1227 void pa_sink_attach_within_thread(pa_sink *s) {
1228     pa_sink_input *i;
1229     void *state = NULL;
1230
1231     pa_sink_assert_ref(s);
1232     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1233
1234     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1235         if (i->attach)
1236             i->attach(i);
1237
1238     if (s->monitor_source)
1239         pa_source_attach_within_thread(s->monitor_source);
1240 }
1241
1242 void pa_sink_request_rewind(pa_sink*s, size_t nbytes) {
1243     pa_sink_assert_ref(s);
1244     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1245
1246     if (nbytes <= 0)
1247         nbytes = s->thread_info.max_rewind;
1248
1249     nbytes = PA_MIN(nbytes, s->thread_info.max_rewind);
1250
1251     if (nbytes <= s->thread_info.rewind_nbytes)
1252         return;
1253
1254     s->thread_info.rewind_nbytes = nbytes;
1255
1256     if (s->request_rewind)
1257         s->request_rewind(s);
1258 }
1259
1260 pa_usec_t pa_sink_get_requested_latency_within_thread(pa_sink *s) {
1261     pa_usec_t result = 0;
1262     pa_sink_input *i;
1263     void *state = NULL;
1264
1265     pa_sink_assert_ref(s);
1266
1267     if (s->thread_info.requested_latency_valid)
1268         return s->thread_info.requested_latency;
1269
1270     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1271
1272         if (i->thread_info.requested_sink_latency > 0 &&
1273             (!result || result > i->thread_info.requested_sink_latency))
1274             result = i->thread_info.requested_sink_latency;
1275
1276     if (result > 0) {
1277         if (s->max_latency > 0 && result > s->max_latency)
1278             result = s->max_latency;
1279
1280         if (s->min_latency > 0 && result < s->min_latency)
1281             result = s->min_latency;
1282     }
1283
1284     s->thread_info.requested_latency = result;
1285     s->thread_info.requested_latency_valid = TRUE;
1286
1287     return result;
1288 }
1289
1290 pa_usec_t pa_sink_get_requested_latency(pa_sink *s) {
1291     pa_usec_t usec = 0;
1292
1293     pa_sink_assert_ref(s);
1294     pa_assert(PA_SINK_LINKED(s->state));
1295
1296     if (!PA_SINK_OPENED(s->state))
1297         return 0;
1298
1299     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL) < 0)
1300         return 0;
1301
1302     return usec;
1303 }
1304
1305 void pa_sink_set_max_rewind(pa_sink *s, size_t max_rewind) {
1306     pa_sink_input *i;
1307     void *state = NULL;
1308
1309     pa_sink_assert_ref(s);
1310
1311     if (max_rewind == s->thread_info.max_rewind)
1312         return;
1313
1314     s->thread_info.max_rewind = max_rewind;
1315
1316     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1317         pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
1318
1319     if (s->monitor_source)
1320         pa_source_set_max_rewind(s->monitor_source, s->thread_info.max_rewind);
1321 }
1322
1323 void pa_sink_invalidate_requested_latency(pa_sink *s) {
1324
1325     pa_sink_assert_ref(s);
1326     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1327
1328     if (!s->thread_info.requested_latency_valid)
1329         return;
1330
1331     s->thread_info.requested_latency_valid = FALSE;
1332
1333     if (s->update_requested_latency)
1334         s->update_requested_latency(s);
1335 }