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     const char *name;
 128     char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 129     pa_source_new_data source_data;
 130     const char *dn;
 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 = FALSE;
 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     dn = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 239     pa_proplist_setf(source_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Monitor of %s", dn ? dn : s->name);
 240     pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_CLASS, "monitor");
 241
 242     s->monitor_source = pa_source_new(core, &source_data, 0);
 243
 244     pa_source_new_data_done(&source_data);
 245
 246     if (!s->monitor_source) {
 247         pa_sink_unlink(s);
 248         pa_sink_unref(s);
 249         return NULL;
 250     }
 251
 252     s->monitor_source->monitor_of = s;
 253     pa_source_set_max_rewind(s->monitor_source, s->thread_info.max_rewind);
 254
 255     return s;
 256 }
 257
 258 static int sink_set_state(pa_sink *s, pa_sink_state_t state) {
 259     int ret;
 260     pa_bool_t suspend_change;
 261
 262     pa_assert(s);
 263
 264     if (s->state == state)
 265         return 0;
 266
 267     suspend_change =
 268         (s->state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(state)) ||
 269         (PA_SINK_IS_OPENED(s->state) && state == PA_SINK_SUSPENDED);
 270
 271     if (s->set_state)
 272         if ((ret = s->set_state(s, state)) < 0)
 273             return -1;
 274
 275     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) < 0)
 276         return -1;
 277
 278     s->state = state;
 279
 280     if (suspend_change) {
 281         pa_sink_input *i;
 282         uint32_t idx;
 283
 284         /* We're suspending or resuming, tell everyone about it */
 285
 286         for (i = PA_SINK_INPUT(pa_idxset_first(s->inputs, &idx)); i; i = PA_SINK_INPUT(pa_idxset_next(s->inputs, &idx)))
 287             if (i->suspend)
 288                 i->suspend(i, state == PA_SINK_SUSPENDED);
 289     }
 290
 291     if (state != PA_SINK_UNLINKED) /* if we enter UNLINKED state pa_sink_unlink() will fire the apropriate events */
 292         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_STATE_CHANGED], s);
 293
 294     return 0;
 295 }
 296
 297 void pa_sink_put(pa_sink* s) {
 298     pa_sink_assert_ref(s);
 299
 300     pa_assert(s->state == PA_SINK_INIT);
 301     pa_assert(s->asyncmsgq);
 302     pa_assert(s->rtpoll);
 303
 304     pa_assert(!s->min_latency || !s->max_latency || s->min_latency <= s->max_latency);
 305
 306     if (!(s->flags & PA_SINK_HW_VOLUME_CTRL))
 307         s->flags |= PA_SINK_DECIBEL_VOLUME;
 308
 309     pa_assert_se(sink_set_state(s, PA_SINK_IDLE) == 0);
 310
 311     pa_source_put(s->monitor_source);
 312
 313     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_NEW, s->index);
 314     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PUT], s);
 315 }
 316
 317 void pa_sink_unlink(pa_sink* s) {
 318     pa_bool_t linked;
 319     pa_sink_input *i, *j = NULL;
 320
 321     pa_assert(s);
 322
 323     /* Please note that pa_sink_unlink() does more than simply
 324      * reversing pa_sink_put(). It also undoes the registrations
 325      * already done in pa_sink_new()! */
 326
 327     /* All operations here shall be idempotent, i.e. pa_sink_unlink()
 328      * may be called multiple times on the same sink without bad
 329      * effects. */
 330
 331     linked = PA_SINK_IS_LINKED(s->state);
 332
 333     if (linked)
 334         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_UNLINK], s);
 335
 336     if (s->state != PA_SINK_UNLINKED)
 337         pa_namereg_unregister(s->core, s->name);
 338     pa_idxset_remove_by_data(s->core->sinks, s, NULL);
 339
 340     while ((i = pa_idxset_first(s->inputs, NULL))) {
 341         pa_assert(i != j);
 342         pa_sink_input_kill(i);
 343         j = i;
 344     }
 345
 346     if (linked)
 347         sink_set_state(s, PA_SINK_UNLINKED);
 348     else
 349         s->state = PA_SINK_UNLINKED;
 350
 351     reset_callbacks(s);
 352
 353     if (s->monitor_source)
 354         pa_source_unlink(s->monitor_source);
 355
 356     if (linked) {
 357         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_REMOVE, s->index);
 358         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_UNLINK_POST], s);
 359     }
 360 }
 361
 362 static void sink_free(pa_object *o) {
 363     pa_sink *s = PA_SINK(o);
 364     pa_sink_input *i;
 365
 366     pa_assert(s);
 367     pa_assert(pa_sink_refcnt(s) == 0);
 368
 369     if (PA_SINK_IS_LINKED(s->state))
 370         pa_sink_unlink(s);
 371
 372     pa_log_info("Freeing sink %u \"%s\"", s->index, s->name);
 373
 374     if (s->monitor_source) {
 375         pa_source_unref(s->monitor_source);
 376         s->monitor_source = NULL;
 377     }
 378
 379     pa_idxset_free(s->inputs, NULL, NULL);
 380
 381     while ((i = pa_hashmap_steal_first(s->thread_info.inputs)))
 382         pa_sink_input_unref(i);
 383
 384     pa_hashmap_free(s->thread_info.inputs, NULL, NULL);
 385
 386     if (s->silence.memblock)
 387         pa_memblock_unref(s->silence.memblock);
 388
 389     pa_xfree(s->name);
 390     pa_xfree(s->driver);
 391
 392     if (s->proplist)
 393         pa_proplist_free(s->proplist);
 394
 395     pa_xfree(s);
 396 }
 397
 398 void pa_sink_set_asyncmsgq(pa_sink *s, pa_asyncmsgq *q) {
 399     pa_sink_assert_ref(s);
 400
 401     s->asyncmsgq = q;
 402
 403     if (s->monitor_source)
 404         pa_source_set_asyncmsgq(s->monitor_source, q);
 405 }
 406
 407 void pa_sink_set_rtpoll(pa_sink *s, pa_rtpoll *p) {
 408     pa_sink_assert_ref(s);
 409
 410     s->rtpoll = p;
 411     if (s->monitor_source)
 412         pa_source_set_rtpoll(s->monitor_source, p);
 413 }
 414
 415 int pa_sink_update_status(pa_sink*s) {
 416     pa_sink_assert_ref(s);
 417     pa_assert(PA_SINK_IS_LINKED(s->state));
 418
 419     if (s->state == PA_SINK_SUSPENDED)
 420         return 0;
 421
 422     return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 423 }
 424
 425 int pa_sink_suspend(pa_sink *s, pa_bool_t suspend) {
 426     pa_sink_assert_ref(s);
 427     pa_assert(PA_SINK_IS_LINKED(s->state));
 428
 429     if (suspend)
 430         return sink_set_state(s, PA_SINK_SUSPENDED);
 431     else
 432         return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 433 }
 434
 435 void pa_sink_process_rewind(pa_sink *s, size_t nbytes) {
 436     pa_sink_input *i;
 437     void *state = NULL;
 438     pa_sink_assert_ref(s);
 439     pa_assert(PA_SINK_IS_LINKED(s->state));
 440
 441     /* Make sure the sink code already reset the counter! */
 442     pa_assert(s->thread_info.rewind_nbytes <= 0);
 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_IS_OPENED(pa_source_get_state(s->monitor_source)))
 455         pa_source_process_rewind(s->monitor_source, nbytes);
 456
 457 }
 458
 459 static unsigned fill_mix_info(pa_sink *s, size_t *length, pa_mix_info *info, unsigned maxinfo) {
 460     pa_sink_input *i;
 461     unsigned n = 0;
 462     void *state = NULL;
 463     size_t mixlength = *length;
 464
 465     pa_sink_assert_ref(s);
 466     pa_assert(info);
 467
 468     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)) && maxinfo > 0) {
 469         pa_sink_input_assert_ref(i);
 470
 471         if (pa_sink_input_peek(i, *length, &info->chunk, &info->volume) < 0)
 472             continue;
 473
 474         if (mixlength == 0 || info->chunk.length < mixlength)
 475             mixlength = info->chunk.length;
 476
 477         if (pa_memblock_is_silence(info->chunk.memblock)) {
 478             pa_memblock_unref(info->chunk.memblock);
 479             continue;
 480         }
 481
 482         info->userdata = pa_sink_input_ref(i);
 483
 484         pa_assert(info->chunk.memblock);
 485         pa_assert(info->chunk.length > 0);
 486
 487         info++;
 488         n++;
 489         maxinfo--;
 490     }
 491
 492     if (mixlength > 0)
 493         *length = mixlength;
 494
 495     return n;
 496 }
 497
 498 static void inputs_drop(pa_sink *s, pa_mix_info *info, unsigned n, size_t length) {
 499     pa_sink_input *i;
 500     void *state = NULL;
 501     unsigned p = 0;
 502     unsigned n_unreffed = 0;
 503
 504     pa_sink_assert_ref(s);
 505
 506     /* We optimize for the case where the order of the inputs has not changed */
 507
 508     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 509         unsigned j;
 510         pa_mix_info* m;
 511
 512         pa_sink_input_assert_ref(i);
 513
 514         m = NULL;
 515
 516         /* Let's try to find the matching entry info the pa_mix_info array */
 517         for (j = 0; j < n; j ++) {
 518
 519             if (info[p].userdata == i) {
 520                 m = info + p;
 521                 break;
 522             }
 523
 524             p++;
 525             if (p >= n)
 526                 p = 0;
 527         }
 528
 529         /* Drop read data */
 530         pa_sink_input_drop(i, length);
 531
 532         if (m) {
 533             pa_sink_input_unref(m->userdata);
 534             m->userdata = NULL;
 535             if (m->chunk.memblock)
 536                 pa_memblock_unref(m->chunk.memblock);
 537             pa_memchunk_reset(&m->chunk);
 538
 539             n_unreffed += 1;
 540         }
 541     }
 542
 543     /* Now drop references to entries that are included in the
 544      * pa_mix_info array but don't exist anymore */
 545
 546     if (n_unreffed < n) {
 547         for (; n > 0; info++, n--) {
 548             if (info->userdata)
 549                 pa_sink_input_unref(info->userdata);
 550             if (info->chunk.memblock)
 551                 pa_memblock_unref(info->chunk.memblock);
 552         }
 553     }
 554 }
 555
 556 void pa_sink_render(pa_sink*s, size_t length, pa_memchunk *result) {
 557     pa_mix_info info[MAX_MIX_CHANNELS];
 558     unsigned n;
 559     size_t block_size_max;
 560
 561     pa_sink_assert_ref(s);
 562     pa_assert(PA_SINK_IS_OPENED(s->thread_info.state));
 563     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 564     pa_assert(result);
 565
 566     pa_sink_ref(s);
 567
 568     s->thread_info.rewind_nbytes = 0;
 569
 570     if (length <= 0)
 571         length = pa_frame_align(MIX_BUFFER_LENGTH, &s->sample_spec);
 572
 573     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 574     if (length > block_size_max)
 575         length = pa_frame_align(block_size_max, &s->sample_spec);
 576
 577     pa_assert(length > 0);
 578
 579     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 580
 581     if (n == 0) {
 582
 583         *result = s->silence;
 584         pa_memblock_ref(result->memblock);
 585
 586         if (result->length > length)
 587             result->length = length;
 588
 589     } else if (n == 1) {
 590         pa_cvolume volume;
 591
 592         *result = info[0].chunk;
 593         pa_memblock_ref(result->memblock);
 594
 595         if (result->length > length)
 596             result->length = length;
 597
 598         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 599
 600         if (s->thread_info.soft_muted || !pa_cvolume_is_norm(&volume)) {
 601             pa_log("adjusting volume ");
 602             pa_memchunk_make_writable(result, 0);
 603             if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 604                 pa_silence_memchunk(result, &s->sample_spec);
 605             else
 606                 pa_volume_memchunk(result, &s->sample_spec, &volume);
 607         }
 608     } else {
 609         void *ptr;
 610         result->memblock = pa_memblock_new(s->core->mempool, length);
 611
 612         ptr = pa_memblock_acquire(result->memblock);
 613         result->length = pa_mix(info, n,
 614                                 ptr, length,
 615                                 &s->sample_spec,
 616                                 &s->thread_info.soft_volume,
 617                                 s->thread_info.soft_muted);
 618         pa_memblock_release(result->memblock);
 619
 620         result->index = 0;
 621     }
 622
 623     if (s->thread_info.state == PA_SINK_RUNNING)
 624         inputs_drop(s, info, n, result->length);
 625
 626     if (s->monitor_source && PA_SOURCE_IS_OPENED(pa_source_get_state(s->monitor_source)))
 627         pa_source_post(s->monitor_source, result);
 628
 629     pa_sink_unref(s);
 630 }
 631
 632 void pa_sink_render_into(pa_sink*s, pa_memchunk *target) {
 633     pa_mix_info info[MAX_MIX_CHANNELS];
 634     unsigned n;
 635     size_t length, block_size_max;
 636
 637     pa_sink_assert_ref(s);
 638     pa_assert(PA_SINK_IS_OPENED(s->thread_info.state));
 639     pa_assert(target);
 640     pa_assert(target->memblock);
 641     pa_assert(target->length > 0);
 642     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 643
 644     pa_sink_ref(s);
 645
 646     s->thread_info.rewind_nbytes = 0;
 647
 648     length = target->length;
 649     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 650     if (length > block_size_max)
 651         length = pa_frame_align(block_size_max, &s->sample_spec);
 652
 653     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 654
 655     if (n == 0) {
 656         if (target->length > length)
 657             target->length = length;
 658
 659         pa_silence_memchunk(target, &s->sample_spec);
 660     } else if (n == 1) {
 661         pa_cvolume volume;
 662
 663         if (target->length > length)
 664             target->length = length;
 665
 666         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 667
 668         if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 669             pa_silence_memchunk(target, &s->sample_spec);
 670         else {
 671             pa_memchunk vchunk;
 672
 673             vchunk = info[0].chunk;
 674             pa_memblock_ref(vchunk.memblock);
 675
 676             if (vchunk.length > target->length)
 677                 vchunk.length = target->length;
 678
 679             if (!pa_cvolume_is_norm(&volume)) {
 680                 pa_memchunk_make_writable(&vchunk, 0);
 681                 pa_volume_memchunk(&vchunk, &s->sample_spec, &volume);
 682             }
 683
 684             pa_memchunk_memcpy(target, &vchunk);
 685             pa_memblock_unref(vchunk.memblock);
 686         }
 687
 688     } else {
 689         void *ptr;
 690
 691         ptr = pa_memblock_acquire(target->memblock);
 692
 693         target->length = pa_mix(info, n,
 694                                 (uint8_t*) ptr + target->index, length,
 695                                 &s->sample_spec,
 696                                 &s->thread_info.soft_volume,
 697                                 s->thread_info.soft_muted);
 698
 699         pa_memblock_release(target->memblock);
 700     }
 701
 702     if (s->thread_info.state == PA_SINK_RUNNING)
 703         inputs_drop(s, info, n, target->length);
 704
 705     if (s->monitor_source && PA_SOURCE_IS_OPENED(pa_source_get_state(s->monitor_source)))
 706         pa_source_post(s->monitor_source, target);
 707
 708     pa_sink_unref(s);
 709 }
 710
 711 void pa_sink_render_into_full(pa_sink *s, pa_memchunk *target) {
 712     pa_memchunk chunk;
 713     size_t l, d;
 714
 715     pa_sink_assert_ref(s);
 716     pa_assert(PA_SINK_IS_OPENED(s->thread_info.state));
 717     pa_assert(target);
 718     pa_assert(target->memblock);
 719     pa_assert(target->length > 0);
 720     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 721
 722     pa_sink_ref(s);
 723
 724     s->thread_info.rewind_nbytes = 0;
 725
 726     l = target->length;
 727     d = 0;
 728     while (l > 0) {
 729         chunk = *target;
 730         chunk.index += d;
 731         chunk.length -= d;
 732
 733         pa_sink_render_into(s, &chunk);
 734
 735         d += chunk.length;
 736         l -= chunk.length;
 737     }
 738
 739     pa_sink_unref(s);
 740 }
 741
 742 void pa_sink_render_full(pa_sink *s, size_t length, pa_memchunk *result) {
 743     pa_sink_assert_ref(s);
 744     pa_assert(PA_SINK_IS_OPENED(s->thread_info.state));
 745     pa_assert(length > 0);
 746     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 747     pa_assert(result);
 748
 749     s->thread_info.rewind_nbytes = 0;
 750
 751     /*** This needs optimization ***/
 752
 753     result->index = 0;
 754     result->length = length;
 755     result->memblock = pa_memblock_new(s->core->mempool, length);
 756
 757     pa_sink_render_into_full(s, result);
 758 }
 759
 760 pa_usec_t pa_sink_get_latency(pa_sink *s) {
 761     pa_usec_t usec = 0;
 762
 763     pa_sink_assert_ref(s);
 764     pa_assert(PA_SINK_IS_LINKED(s->state));
 765
 766     /* The returned value is supposed to be in the time domain of the sound card! */
 767
 768     if (!PA_SINK_IS_OPENED(s->state))
 769         return 0;
 770
 771     if (s->get_latency)
 772         return s->get_latency(s);
 773
 774     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_LATENCY, &usec, 0, NULL) < 0)
 775         return 0;
 776
 777     return usec;
 778 }
 779
 780 void pa_sink_set_volume(pa_sink *s, const pa_cvolume *volume) {
 781     int changed;
 782
 783     pa_sink_assert_ref(s);
 784     pa_assert(PA_SINK_IS_LINKED(s->state));
 785     pa_assert(volume);
 786
 787     changed = !pa_cvolume_equal(volume, &s->volume);
 788     s->volume = *volume;
 789
 790     if (s->set_volume && s->set_volume(s) < 0)
 791         s->set_volume = NULL;
 792
 793     if (!s->set_volume)
 794         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_VOLUME, pa_xnewdup(struct pa_cvolume, volume, 1), 0, NULL, pa_xfree);
 795
 796     if (changed)
 797         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 798 }
 799
 800 const pa_cvolume *pa_sink_get_volume(pa_sink *s) {
 801     struct pa_cvolume old_volume;
 802
 803     pa_sink_assert_ref(s);
 804     pa_assert(PA_SINK_IS_LINKED(s->state));
 805
 806     old_volume = s->volume;
 807
 808     if (s->get_volume && s->get_volume(s) < 0)
 809         s->get_volume = NULL;
 810
 811     if (!s->get_volume && s->refresh_volume)
 812         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_VOLUME, &s->volume, 0, NULL);
 813
 814     if (!pa_cvolume_equal(&old_volume, &s->volume))
 815         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 816
 817     return &s->volume;
 818 }
 819
 820 void pa_sink_set_mute(pa_sink *s, pa_bool_t mute) {
 821     int changed;
 822
 823     pa_sink_assert_ref(s);
 824     pa_assert(PA_SINK_IS_LINKED(s->state));
 825
 826     changed = s->muted != mute;
 827     s->muted = mute;
 828
 829     if (s->set_mute && s->set_mute(s) < 0)
 830         s->set_mute = NULL;
 831
 832     if (!s->set_mute)
 833         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
 834
 835     if (changed)
 836         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 837 }
 838
 839 pa_bool_t pa_sink_get_mute(pa_sink *s) {
 840     pa_bool_t old_muted;
 841
 842     pa_sink_assert_ref(s);
 843     pa_assert(PA_SINK_IS_LINKED(s->state));
 844
 845     old_muted = s->muted;
 846
 847     if (s->get_mute && s->get_mute(s) < 0)
 848         s->get_mute = NULL;
 849
 850     if (!s->get_mute && s->refresh_mute)
 851         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_MUTE, &s->muted, 0, NULL);
 852
 853     if (old_muted != s->muted)
 854         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 855
 856     return s->muted;
 857 }
 858
 859 void pa_sink_set_description(pa_sink *s, const char *description) {
 860     const char *old;
 861     pa_sink_assert_ref(s);
 862
 863     if (!description && !pa_proplist_contains(s->proplist, PA_PROP_DEVICE_DESCRIPTION))
 864         return;
 865
 866     old = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 867
 868     if (old && description && !strcmp(old, description))
 869         return;
 870
 871     if (description)
 872         pa_proplist_sets(s->proplist, PA_PROP_DEVICE_DESCRIPTION, description);
 873     else
 874         pa_proplist_unset(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 875
 876     if (s->monitor_source) {
 877         char *n;
 878
 879         n = pa_sprintf_malloc("Monitor Source of %s", description ? description : s->name);
 880         pa_source_set_description(s->monitor_source, n);
 881         pa_xfree(n);
 882     }
 883
 884     if (PA_SINK_IS_LINKED(s->state)) {
 885         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 886         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PROPLIST_CHANGED], s);
 887     }
 888 }
 889
 890 unsigned pa_sink_linked_by(pa_sink *s) {
 891     unsigned ret;
 892
 893     pa_sink_assert_ref(s);
 894     pa_assert(PA_SINK_IS_LINKED(s->state));
 895
 896     ret = pa_idxset_size(s->inputs);
 897
 898     /* We add in the number of streams connected to us here. Please
 899      * not the asymmmetry to pa_sink_used_by()! */
 900
 901     if (s->monitor_source)
 902         ret += pa_source_linked_by(s->monitor_source);
 903
 904     return ret;
 905 }
 906
 907 unsigned pa_sink_used_by(pa_sink *s) {
 908     unsigned ret;
 909
 910     pa_sink_assert_ref(s);
 911     pa_assert(PA_SINK_IS_LINKED(s->state));
 912
 913     ret = pa_idxset_size(s->inputs);
 914     pa_assert(ret >= s->n_corked);
 915
 916     /* Streams connected to our monitor source do not matter for
 917      * pa_sink_used_by()!.*/
 918
 919     return ret - s->n_corked;
 920 }
 921
 922 int pa_sink_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
 923     pa_sink *s = PA_SINK(o);
 924     pa_sink_assert_ref(s);
 925     pa_assert(s->thread_info.state != PA_SINK_UNLINKED);
 926
 927     switch ((pa_sink_message_t) code) {
 928
 929         case PA_SINK_MESSAGE_ADD_INPUT: {
 930             pa_sink_input *i = PA_SINK_INPUT(userdata);
 931
 932             pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index), pa_sink_input_ref(i));
 933
 934             /* Since the caller sleeps in pa_sink_input_put(), we can
 935              * safely access data outside of thread_info even though
 936              * it is mutable */
 937
 938             if ((i->thread_info.sync_prev = i->sync_prev)) {
 939                 pa_assert(i->sink == i->thread_info.sync_prev->sink);
 940                 pa_assert(i->sync_prev->sync_next == i);
 941                 i->thread_info.sync_prev->thread_info.sync_next = i;
 942             }
 943
 944             if ((i->thread_info.sync_next = i->sync_next)) {
 945                 pa_assert(i->sink == i->thread_info.sync_next->sink);
 946                 pa_assert(i->sync_next->sync_prev == i);
 947                 i->thread_info.sync_next->thread_info.sync_prev = i;
 948             }
 949
 950             pa_assert(!i->thread_info.attached);
 951             i->thread_info.attached = TRUE;
 952
 953             if (i->attach)
 954                 i->attach(i);
 955
 956             pa_sink_input_set_state_within_thread(i, i->state);
 957
 958             pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
 959
 960             pa_sink_invalidate_requested_latency(s);
 961
 962             /* We don't rewind here automatically. This is left to the
 963              * sink input implementor because some sink inputs need a
 964              * slow start, i.e. need some time to buffer client
 965              * samples before beginning streaming. */
 966
 967             /* If you change anything here, make sure to change the
 968              * ghost sink input handling a few lines down at
 969              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
 970
 971             return 0;
 972         }
 973
 974         case PA_SINK_MESSAGE_REMOVE_INPUT: {
 975             pa_sink_input *i = PA_SINK_INPUT(userdata);
 976
 977             /* If you change anything here, make sure to change the
 978              * sink input handling a few lines down at
 979              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
 980
 981             pa_sink_input_set_state_within_thread(i, i->state);
 982
 983             if (i->detach)
 984                 i->detach(i);
 985
 986             pa_assert(i->thread_info.attached);
 987             i->thread_info.attached = FALSE;
 988
 989             /* Since the caller sleeps in pa_sink_input_unlink(),
 990              * we can safely access data outside of thread_info even
 991              * though it is mutable */
 992
 993             pa_assert(!i->thread_info.sync_prev);
 994             pa_assert(!i->thread_info.sync_next);
 995
 996             if (i->thread_info.sync_prev) {
 997                 i->thread_info.sync_prev->thread_info.sync_next = i->thread_info.sync_prev->sync_next;
 998                 i->thread_info.sync_prev = NULL;
 999             }
1000
1001             if (i->thread_info.sync_next) {
1002                 i->thread_info.sync_next->thread_info.sync_prev = i->thread_info.sync_next->sync_prev;
1003                 i->thread_info.sync_next = NULL;
1004             }
1005
1006             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index)))
1007                 pa_sink_input_unref(i);
1008
1009             pa_sink_invalidate_requested_latency(s);
1010             pa_sink_request_rewind(s, 0);
1011
1012             return 0;
1013         }
1014
1015         case PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER: {
1016             pa_sink_input_move_info *info = userdata;
1017             int volume_is_norm;
1018
1019             /* We don't support moving synchronized streams. */
1020             pa_assert(!info->sink_input->sync_prev);
1021             pa_assert(!info->sink_input->sync_next);
1022             pa_assert(!info->sink_input->thread_info.sync_next);
1023             pa_assert(!info->sink_input->thread_info.sync_prev);
1024
1025             if (info->sink_input->detach)
1026                 info->sink_input->detach(info->sink_input);
1027
1028             pa_assert(info->sink_input->thread_info.attached);
1029             info->sink_input->thread_info.attached = FALSE;
1030             pa_sink_invalidate_requested_latency(info->sink_input->sink);
1031
1032             if (info->ghost_sink_input) {
1033                 pa_assert(info->buffer_bytes > 0);
1034                 pa_assert(info->buffer);
1035
1036                 volume_is_norm = pa_cvolume_is_norm(&info->sink_input->thread_info.volume);
1037
1038                 pa_log_debug("Buffering %lu bytes ...", (unsigned long) info->buffer_bytes);
1039
1040                 while (info->buffer_bytes > 0) {
1041                     pa_memchunk memchunk;
1042                     pa_cvolume volume;
1043                     size_t n;
1044
1045                     if (pa_sink_input_peek(info->sink_input, info->buffer_bytes, &memchunk, &volume) < 0)
1046                         break;
1047
1048                     n = memchunk.length > info->buffer_bytes ? info->buffer_bytes : memchunk.length;
1049                     pa_sink_input_drop(info->sink_input, n);
1050                     memchunk.length = n;
1051
1052                     if (!volume_is_norm) {
1053                         pa_memchunk_make_writable(&memchunk, 0);
1054                         pa_volume_memchunk(&memchunk, &s->sample_spec, &volume);
1055                     }
1056
1057                     if (pa_memblockq_push(info->buffer, &memchunk) < 0) {
1058                         pa_memblock_unref(memchunk.memblock);
1059                         break;
1060                     }
1061
1062                     pa_memblock_unref(memchunk.memblock);
1063                     info->buffer_bytes -= n;
1064                 }
1065
1066                 /* Add the remaining already resampled chunks to the buffer */
1067                 pa_memblockq_splice(info->buffer, info->sink_input->thread_info.render_memblockq);
1068
1069                 pa_memblockq_sink_input_set_queue(info->ghost_sink_input, info->buffer);
1070
1071                 pa_log_debug("Buffered %lu bytes ...", (unsigned long) pa_memblockq_get_length(info->buffer));
1072             }
1073
1074             /* Let's remove the sink input ...*/
1075             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(info->sink_input->index)))
1076                 pa_sink_input_unref(info->sink_input);
1077
1078             /* .. and add the ghost sink input instead */
1079             if (info->ghost_sink_input) {
1080                 pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(info->ghost_sink_input->index), pa_sink_input_ref(info->ghost_sink_input));
1081                 info->ghost_sink_input->thread_info.sync_prev = info->ghost_sink_input->thread_info.sync_next = NULL;
1082
1083                 pa_sink_input_update_max_rewind(info->ghost_sink_input, s->thread_info.max_rewind);
1084
1085                 pa_assert(!info->ghost_sink_input->thread_info.attached);
1086                 info->ghost_sink_input->thread_info.attached = TRUE;
1087
1088                 if (info->ghost_sink_input->attach)
1089                     info->ghost_sink_input->attach(info->ghost_sink_input);
1090             }
1091
1092             pa_sink_invalidate_requested_latency(s);
1093             pa_sink_request_rewind(s, 0);
1094
1095             return 0;
1096         }
1097
1098         case PA_SINK_MESSAGE_SET_VOLUME:
1099             s->thread_info.soft_volume = *((pa_cvolume*) userdata);
1100
1101             pa_sink_request_rewind(s, 0);
1102             return 0;
1103
1104         case PA_SINK_MESSAGE_SET_MUTE:
1105             s->thread_info.soft_muted = PA_PTR_TO_UINT(userdata);
1106
1107             pa_sink_request_rewind(s, 0);
1108             return 0;
1109
1110         case PA_SINK_MESSAGE_GET_VOLUME:
1111             *((pa_cvolume*) userdata) = s->thread_info.soft_volume;
1112             return 0;
1113
1114         case PA_SINK_MESSAGE_GET_MUTE:
1115             *((pa_bool_t*) userdata) = s->thread_info.soft_muted;
1116             return 0;
1117
1118         case PA_SINK_MESSAGE_SET_STATE:
1119
1120             s->thread_info.state = PA_PTR_TO_UINT(userdata);
1121             return 0;
1122
1123         case PA_SINK_MESSAGE_DETACH:
1124
1125             /* We're detaching all our input streams so that the
1126              * asyncmsgq and rtpoll fields can be changed without
1127              * problems */
1128             pa_sink_detach_within_thread(s);
1129             return 0;
1130
1131         case PA_SINK_MESSAGE_ATTACH:
1132
1133             /* Reattach all streams */
1134             pa_sink_attach_within_thread(s);
1135             return 0;
1136
1137         case PA_SINK_MESSAGE_GET_REQUESTED_LATENCY: {
1138
1139             pa_usec_t *usec = userdata;
1140             *usec = pa_sink_get_requested_latency_within_thread(s);
1141             return 0;
1142         }
1143
1144         case PA_SINK_MESSAGE_GET_LATENCY:
1145         case PA_SINK_MESSAGE_MAX:
1146             ;
1147     }
1148
1149     return -1;
1150 }
1151
1152 int pa_sink_suspend_all(pa_core *c, pa_bool_t suspend) {
1153     pa_sink *sink;
1154     uint32_t idx;
1155     int ret = 0;
1156
1157     pa_core_assert_ref(c);
1158
1159     for (sink = PA_SINK(pa_idxset_first(c->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(c->sinks, &idx)))
1160         ret -= pa_sink_suspend(sink, suspend) < 0;
1161
1162     return ret;
1163 }
1164
1165 void pa_sink_detach(pa_sink *s) {
1166     pa_sink_assert_ref(s);
1167     pa_assert(PA_SINK_IS_LINKED(s->state));
1168
1169     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_DETACH, NULL, 0, NULL);
1170 }
1171
1172 void pa_sink_attach(pa_sink *s) {
1173     pa_sink_assert_ref(s);
1174     pa_assert(PA_SINK_IS_LINKED(s->state));
1175
1176     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_ATTACH, NULL, 0, NULL);
1177 }
1178
1179 void pa_sink_detach_within_thread(pa_sink *s) {
1180     pa_sink_input *i;
1181     void *state = NULL;
1182
1183     pa_sink_assert_ref(s);
1184     pa_assert(PA_SINK_IS_LINKED(s->thread_info.state));
1185
1186     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1187         if (i->detach)
1188             i->detach(i);
1189
1190     if (s->monitor_source)
1191         pa_source_detach_within_thread(s->monitor_source);
1192 }
1193
1194 void pa_sink_attach_within_thread(pa_sink *s) {
1195     pa_sink_input *i;
1196     void *state = NULL;
1197
1198     pa_sink_assert_ref(s);
1199     pa_assert(PA_SINK_IS_LINKED(s->thread_info.state));
1200
1201     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1202         if (i->attach)
1203             i->attach(i);
1204
1205     if (s->monitor_source)
1206         pa_source_attach_within_thread(s->monitor_source);
1207 }
1208
1209 void pa_sink_request_rewind(pa_sink*s, size_t nbytes) {
1210     pa_sink_assert_ref(s);
1211     pa_assert(PA_SINK_IS_LINKED(s->thread_info.state));
1212
1213     if (nbytes <= 0)
1214         nbytes = s->thread_info.max_rewind;
1215
1216     nbytes = PA_MIN(nbytes, s->thread_info.max_rewind);
1217
1218     if (nbytes <= s->thread_info.rewind_nbytes)
1219         return;
1220
1221     s->thread_info.rewind_nbytes = nbytes;
1222
1223     if (s->request_rewind)
1224         s->request_rewind(s);
1225 }
1226
1227 pa_usec_t pa_sink_get_requested_latency_within_thread(pa_sink *s) {
1228     pa_usec_t result = (pa_usec_t) -1;
1229     pa_sink_input *i;
1230     void *state = NULL;
1231
1232     pa_sink_assert_ref(s);
1233
1234     if (s->thread_info.requested_latency_valid)
1235         return s->thread_info.requested_latency;
1236
1237     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1238
1239         if (i->thread_info.requested_sink_latency != (pa_usec_t) -1 &&
1240             (result == (pa_usec_t) -1 || result > i->thread_info.requested_sink_latency))
1241             result = i->thread_info.requested_sink_latency;
1242
1243     if (result != (pa_usec_t) -1) {
1244         if (s->max_latency > 0 && result > s->max_latency)
1245             result = s->max_latency;
1246
1247         if (s->min_latency > 0 && result < s->min_latency)
1248             result = s->min_latency;
1249     }
1250
1251     s->thread_info.requested_latency = result;
1252     s->thread_info.requested_latency_valid = TRUE;
1253
1254     return result;
1255 }
1256
1257 pa_usec_t pa_sink_get_requested_latency(pa_sink *s) {
1258     pa_usec_t usec = 0;
1259
1260     pa_sink_assert_ref(s);
1261     pa_assert(PA_SINK_IS_LINKED(s->state));
1262
1263     if (!PA_SINK_IS_OPENED(s->state))
1264         return 0;
1265
1266     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL) < 0)
1267         return 0;
1268
1269     if (usec == (pa_usec_t) -1)
1270         usec = s->max_latency;
1271
1272     return usec;
1273 }
1274
1275 void pa_sink_set_max_rewind(pa_sink *s, size_t max_rewind) {
1276     pa_sink_input *i;
1277     void *state = NULL;
1278
1279     pa_sink_assert_ref(s);
1280
1281     if (max_rewind == s->thread_info.max_rewind)
1282         return;
1283
1284     s->thread_info.max_rewind = max_rewind;
1285
1286     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1287         pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
1288
1289     if (s->monitor_source)
1290         pa_source_set_max_rewind(s->monitor_source, s->thread_info.max_rewind);
1291 }
1292
1293 void pa_sink_invalidate_requested_latency(pa_sink *s) {
1294
1295     pa_sink_assert_ref(s);
1296     pa_assert(PA_SINK_IS_LINKED(s->thread_info.state));
1297
1298     if (!s->thread_info.requested_latency_valid)
1299         return;
1300
1301     s->thread_info.requested_latency_valid = FALSE;
1302
1303     if (s->update_requested_latency)
1304         s->update_requested_latency(s);
1305 }