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_OPENED(state)) ||
 269         (PA_SINK_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_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_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     pa_assert(q);
 401
 402     s->asyncmsgq = q;
 403
 404     if (s->monitor_source)
 405         pa_source_set_asyncmsgq(s->monitor_source, q);
 406 }
 407
 408 void pa_sink_set_rtpoll(pa_sink *s, pa_rtpoll *p) {
 409     pa_sink_assert_ref(s);
 410     pa_assert(p);
 411
 412     s->rtpoll = p;
 413     if (s->monitor_source)
 414         pa_source_set_rtpoll(s->monitor_source, p);
 415 }
 416
 417 int pa_sink_update_status(pa_sink*s) {
 418     pa_sink_assert_ref(s);
 419     pa_assert(PA_SINK_LINKED(s->state));
 420
 421     if (s->state == PA_SINK_SUSPENDED)
 422         return 0;
 423
 424     return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 425 }
 426
 427 int pa_sink_suspend(pa_sink *s, pa_bool_t suspend) {
 428     pa_sink_assert_ref(s);
 429     pa_assert(PA_SINK_LINKED(s->state));
 430
 431     if (suspend)
 432         return sink_set_state(s, PA_SINK_SUSPENDED);
 433     else
 434         return sink_set_state(s, pa_sink_used_by(s) ? PA_SINK_RUNNING : PA_SINK_IDLE);
 435 }
 436
 437 void pa_sink_process_rewind(pa_sink *s, size_t nbytes) {
 438     pa_sink_input *i;
 439     void *state = NULL;
 440     pa_sink_assert_ref(s);
 441     pa_assert(PA_SINK_LINKED(s->state));
 442
 443     if (nbytes <= 0)
 444         return;
 445
 446     pa_log_debug("Processing rewind...");
 447
 448     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 449         pa_sink_input_assert_ref(i);
 450         pa_sink_input_process_rewind(i, nbytes);
 451     }
 452
 453     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 454         pa_source_process_rewind(s->monitor_source, nbytes);
 455 }
 456
 457 static unsigned fill_mix_info(pa_sink *s, size_t *length, pa_mix_info *info, unsigned maxinfo) {
 458     pa_sink_input *i;
 459     unsigned n = 0;
 460     void *state = NULL;
 461     size_t mixlength = *length;
 462
 463     pa_sink_assert_ref(s);
 464     pa_assert(info);
 465
 466     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)) && maxinfo > 0) {
 467         pa_sink_input_assert_ref(i);
 468
 469         if (pa_sink_input_peek(i, *length, &info->chunk, &info->volume) < 0)
 470             continue;
 471
 472         if (mixlength == 0 || info->chunk.length < mixlength)
 473             mixlength = info->chunk.length;
 474
 475         if (pa_memblock_is_silence(info->chunk.memblock)) {
 476             pa_memblock_unref(info->chunk.memblock);
 477             continue;
 478         }
 479
 480         info->userdata = pa_sink_input_ref(i);
 481
 482         pa_assert(info->chunk.memblock);
 483         pa_assert(info->chunk.length > 0);
 484
 485         info++;
 486         n++;
 487         maxinfo--;
 488     }
 489
 490     if (mixlength > 0)
 491         *length = mixlength;
 492
 493     return n;
 494 }
 495
 496 static void inputs_drop(pa_sink *s, pa_mix_info *info, unsigned n, size_t length) {
 497     pa_sink_input *i;
 498     void *state = NULL;
 499     unsigned p = 0;
 500     unsigned n_unreffed = 0;
 501
 502     pa_sink_assert_ref(s);
 503
 504     /* We optimize for the case where the order of the inputs has not changed */
 505
 506     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 507         unsigned j;
 508         pa_mix_info* m;
 509
 510         pa_sink_input_assert_ref(i);
 511
 512         m = NULL;
 513
 514         /* Let's try to find the matching entry info the pa_mix_info array */
 515         for (j = 0; j < n; j ++) {
 516
 517             if (info[p].userdata == i) {
 518                 m = info + p;
 519                 break;
 520             }
 521
 522             p++;
 523             if (p >= n)
 524                 p = 0;
 525         }
 526
 527         /* Drop read data */
 528         pa_sink_input_drop(i, length);
 529
 530         if (m) {
 531             pa_sink_input_unref(m->userdata);
 532             m->userdata = NULL;
 533             if (m->chunk.memblock)
 534                 pa_memblock_unref(m->chunk.memblock);
 535             pa_memchunk_reset(&m->chunk);
 536
 537             n_unreffed += 1;
 538         }
 539     }
 540
 541     /* Now drop references to entries that are included in the
 542      * pa_mix_info array but don't exist anymore */
 543
 544     if (n_unreffed < n) {
 545         for (; n > 0; info++, n--) {
 546             if (info->userdata)
 547                 pa_sink_input_unref(info->userdata);
 548             if (info->chunk.memblock)
 549                 pa_memblock_unref(info->chunk.memblock);
 550         }
 551     }
 552 }
 553
 554 void pa_sink_render(pa_sink*s, size_t length, pa_memchunk *result) {
 555     pa_mix_info info[MAX_MIX_CHANNELS];
 556     unsigned n;
 557     size_t block_size_max;
 558
 559     pa_sink_assert_ref(s);
 560     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 561     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 562     pa_assert(result);
 563
 564     pa_sink_ref(s);
 565
 566     s->thread_info.rewind_nbytes = 0;
 567
 568     if (length <= 0)
 569         length = pa_frame_align(MIX_BUFFER_LENGTH, &s->sample_spec);
 570
 571     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 572     if (length > block_size_max)
 573         length = pa_frame_align(block_size_max, &s->sample_spec);
 574
 575     pa_assert(length > 0);
 576
 577     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 578
 579     if (n == 0) {
 580
 581         *result = s->silence;
 582         pa_memblock_ref(result->memblock);
 583
 584         if (result->length > length)
 585             result->length = length;
 586
 587     } else if (n == 1) {
 588         pa_cvolume volume;
 589
 590         *result = info[0].chunk;
 591         pa_memblock_ref(result->memblock);
 592
 593         if (result->length > length)
 594             result->length = length;
 595
 596         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 597
 598         if (s->thread_info.soft_muted || !pa_cvolume_is_norm(&volume)) {
 599             pa_log("adjusting volume ");
 600             pa_memchunk_make_writable(result, 0);
 601             if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 602                 pa_silence_memchunk(result, &s->sample_spec);
 603             else
 604                 pa_volume_memchunk(result, &s->sample_spec, &volume);
 605         }
 606     } else {
 607         void *ptr;
 608         result->memblock = pa_memblock_new(s->core->mempool, length);
 609
 610         ptr = pa_memblock_acquire(result->memblock);
 611         result->length = pa_mix(info, n,
 612                                 ptr, length,
 613                                 &s->sample_spec,
 614                                 &s->thread_info.soft_volume,
 615                                 s->thread_info.soft_muted);
 616         pa_memblock_release(result->memblock);
 617
 618         result->index = 0;
 619     }
 620
 621     if (s->thread_info.state == PA_SINK_RUNNING)
 622         inputs_drop(s, info, n, result->length);
 623
 624     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 625         pa_source_post(s->monitor_source, result);
 626
 627     pa_sink_unref(s);
 628 }
 629
 630 void pa_sink_render_into(pa_sink*s, pa_memchunk *target) {
 631     pa_mix_info info[MAX_MIX_CHANNELS];
 632     unsigned n;
 633     size_t length, block_size_max;
 634
 635     pa_sink_assert_ref(s);
 636     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 637     pa_assert(target);
 638     pa_assert(target->memblock);
 639     pa_assert(target->length > 0);
 640     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 641
 642     pa_sink_ref(s);
 643
 644     s->thread_info.rewind_nbytes = 0;
 645
 646     length = target->length;
 647     block_size_max = pa_mempool_block_size_max(s->core->mempool);
 648     if (length > block_size_max)
 649         length = pa_frame_align(block_size_max, &s->sample_spec);
 650
 651     n = s->thread_info.state == PA_SINK_RUNNING ? fill_mix_info(s, &length, info, MAX_MIX_CHANNELS) : 0;
 652
 653     if (n == 0) {
 654         if (target->length > length)
 655             target->length = length;
 656
 657         pa_silence_memchunk(target, &s->sample_spec);
 658     } else if (n == 1) {
 659         pa_cvolume volume;
 660
 661         if (target->length > length)
 662             target->length = length;
 663
 664         pa_sw_cvolume_multiply(&volume, &s->thread_info.soft_volume, &info[0].volume);
 665
 666         if (s->thread_info.soft_muted || pa_cvolume_is_muted(&volume))
 667             pa_silence_memchunk(target, &s->sample_spec);
 668         else {
 669             pa_memchunk vchunk;
 670
 671             vchunk = info[0].chunk;
 672             pa_memblock_ref(vchunk.memblock);
 673
 674             if (vchunk.length > target->length)
 675                 vchunk.length = target->length;
 676
 677             if (!pa_cvolume_is_norm(&volume)) {
 678                 pa_memchunk_make_writable(&vchunk, 0);
 679                 pa_volume_memchunk(&vchunk, &s->sample_spec, &volume);
 680             }
 681
 682             pa_memchunk_memcpy(target, &vchunk);
 683             pa_memblock_unref(vchunk.memblock);
 684         }
 685
 686     } else {
 687         void *ptr;
 688
 689         ptr = pa_memblock_acquire(target->memblock);
 690
 691         target->length = pa_mix(info, n,
 692                                 (uint8_t*) ptr + target->index, length,
 693                                 &s->sample_spec,
 694                                 &s->thread_info.soft_volume,
 695                                 s->thread_info.soft_muted);
 696
 697         pa_memblock_release(target->memblock);
 698     }
 699
 700     if (s->thread_info.state == PA_SINK_RUNNING)
 701         inputs_drop(s, info, n, target->length);
 702
 703     if (s->monitor_source && PA_SOURCE_OPENED(pa_source_get_state(s->monitor_source)))
 704         pa_source_post(s->monitor_source, target);
 705
 706     pa_sink_unref(s);
 707 }
 708
 709 void pa_sink_render_into_full(pa_sink *s, pa_memchunk *target) {
 710     pa_memchunk chunk;
 711     size_t l, d;
 712
 713     pa_sink_assert_ref(s);
 714     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 715     pa_assert(target);
 716     pa_assert(target->memblock);
 717     pa_assert(target->length > 0);
 718     pa_assert(pa_frame_aligned(target->length, &s->sample_spec));
 719
 720     pa_sink_ref(s);
 721
 722     s->thread_info.rewind_nbytes = 0;
 723
 724     l = target->length;
 725     d = 0;
 726     while (l > 0) {
 727         chunk = *target;
 728         chunk.index += d;
 729         chunk.length -= d;
 730
 731         pa_sink_render_into(s, &chunk);
 732
 733         d += chunk.length;
 734         l -= chunk.length;
 735     }
 736
 737     pa_sink_unref(s);
 738 }
 739
 740 void pa_sink_render_full(pa_sink *s, size_t length, pa_memchunk *result) {
 741     pa_sink_assert_ref(s);
 742     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 743     pa_assert(length > 0);
 744     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 745     pa_assert(result);
 746
 747     s->thread_info.rewind_nbytes = 0;
 748
 749     /*** This needs optimization ***/
 750
 751     result->index = 0;
 752     result->length = length;
 753     result->memblock = pa_memblock_new(s->core->mempool, length);
 754
 755     pa_sink_render_into_full(s, result);
 756 }
 757
 758 void pa_sink_skip(pa_sink *s, size_t length) {
 759     pa_sink_input *i;
 760     void *state = NULL;
 761
 762     pa_sink_assert_ref(s);
 763     pa_assert(PA_SINK_OPENED(s->thread_info.state));
 764     pa_assert(length > 0);
 765     pa_assert(pa_frame_aligned(length, &s->sample_spec));
 766
 767     s->thread_info.rewind_nbytes = 0;
 768
 769     if (pa_source_used_by(s->monitor_source)) {
 770         pa_memchunk chunk;
 771
 772         /* If something is connected to our monitor source, we have to
 773          * pass valid data to it */
 774
 775         while (length > 0) {
 776             pa_sink_render(s, length, &chunk);
 777             pa_memblock_unref(chunk.memblock);
 778
 779             pa_assert(chunk.length <= length);
 780             length -= chunk.length;
 781         }
 782
 783     } else {
 784         /* Ok, noone cares about the rendered data, so let's not even render it */
 785
 786         while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL))) {
 787             pa_sink_input_assert_ref(i);
 788             pa_sink_input_drop(i, length);
 789         }
 790     }
 791 }
 792
 793 pa_usec_t pa_sink_get_latency(pa_sink *s) {
 794     pa_usec_t usec = 0;
 795
 796     pa_sink_assert_ref(s);
 797     pa_assert(PA_SINK_LINKED(s->state));
 798
 799     /* The returned value is supposed to be in the time domain of the sound card! */
 800
 801     if (!PA_SINK_OPENED(s->state))
 802         return 0;
 803
 804     if (s->get_latency)
 805         return s->get_latency(s);
 806
 807     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_LATENCY, &usec, 0, NULL) < 0)
 808         return 0;
 809
 810     return usec;
 811 }
 812
 813 void pa_sink_set_volume(pa_sink *s, const pa_cvolume *volume) {
 814     int changed;
 815
 816     pa_sink_assert_ref(s);
 817     pa_assert(PA_SINK_LINKED(s->state));
 818     pa_assert(volume);
 819
 820     changed = !pa_cvolume_equal(volume, &s->volume);
 821     s->volume = *volume;
 822
 823     if (s->set_volume && s->set_volume(s) < 0)
 824         s->set_volume = NULL;
 825
 826     if (!s->set_volume)
 827         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_VOLUME, pa_xnewdup(struct pa_cvolume, volume, 1), 0, NULL, pa_xfree);
 828
 829     if (changed)
 830         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 831 }
 832
 833 const pa_cvolume *pa_sink_get_volume(pa_sink *s) {
 834     struct pa_cvolume old_volume;
 835
 836     pa_sink_assert_ref(s);
 837     pa_assert(PA_SINK_LINKED(s->state));
 838
 839     old_volume = s->volume;
 840
 841     if (s->get_volume && s->get_volume(s) < 0)
 842         s->get_volume = NULL;
 843
 844     if (!s->get_volume && s->refresh_volume)
 845         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_VOLUME, &s->volume, 0, NULL);
 846
 847     if (!pa_cvolume_equal(&old_volume, &s->volume))
 848         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 849
 850     return &s->volume;
 851 }
 852
 853 void pa_sink_set_mute(pa_sink *s, pa_bool_t mute) {
 854     int changed;
 855
 856     pa_sink_assert_ref(s);
 857     pa_assert(PA_SINK_LINKED(s->state));
 858
 859     changed = s->muted != mute;
 860     s->muted = mute;
 861
 862     if (s->set_mute && s->set_mute(s) < 0)
 863         s->set_mute = NULL;
 864
 865     if (!s->set_mute)
 866         pa_asyncmsgq_post(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
 867
 868     if (changed)
 869         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 870 }
 871
 872 pa_bool_t pa_sink_get_mute(pa_sink *s) {
 873     pa_bool_t old_muted;
 874
 875     pa_sink_assert_ref(s);
 876     pa_assert(PA_SINK_LINKED(s->state));
 877
 878     old_muted = s->muted;
 879
 880     if (s->get_mute && s->get_mute(s) < 0)
 881         s->get_mute = NULL;
 882
 883     if (!s->get_mute && s->refresh_mute)
 884         pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_MUTE, &s->muted, 0, NULL);
 885
 886     if (old_muted != s->muted)
 887         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 888
 889     return s->muted;
 890 }
 891
 892 void pa_sink_set_description(pa_sink *s, const char *description) {
 893     const char *old;
 894     pa_sink_assert_ref(s);
 895
 896     if (!description && !pa_proplist_contains(s->proplist, PA_PROP_DEVICE_DESCRIPTION))
 897         return;
 898
 899     old = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 900
 901     if (old && description && !strcmp(old, description))
 902         return;
 903
 904     if (description)
 905         pa_proplist_sets(s->proplist, PA_PROP_DEVICE_DESCRIPTION, description);
 906     else
 907         pa_proplist_unset(s->proplist, PA_PROP_DEVICE_DESCRIPTION);
 908
 909     if (s->monitor_source) {
 910         char *n;
 911
 912         n = pa_sprintf_malloc("Monitor Source of %s", description ? description : s->name);
 913         pa_source_set_description(s->monitor_source, n);
 914         pa_xfree(n);
 915     }
 916
 917     if (PA_SINK_LINKED(s->state)) {
 918         pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 919         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PROPLIST_CHANGED], s);
 920     }
 921 }
 922
 923 unsigned pa_sink_linked_by(pa_sink *s) {
 924     unsigned ret;
 925
 926     pa_sink_assert_ref(s);
 927     pa_assert(PA_SINK_LINKED(s->state));
 928
 929     ret = pa_idxset_size(s->inputs);
 930
 931     /* We add in the number of streams connected to us here. Please
 932      * not the asymmmetry to pa_sink_used_by()! */
 933
 934     if (s->monitor_source)
 935         ret += pa_source_linked_by(s->monitor_source);
 936
 937     return ret;
 938 }
 939
 940 unsigned pa_sink_used_by(pa_sink *s) {
 941     unsigned ret;
 942
 943     pa_sink_assert_ref(s);
 944     pa_assert(PA_SINK_LINKED(s->state));
 945
 946     ret = pa_idxset_size(s->inputs);
 947     pa_assert(ret >= s->n_corked);
 948
 949     /* Streams connected to our monitor source do not matter for
 950      * pa_sink_used_by()!.*/
 951
 952     return ret - s->n_corked;
 953 }
 954
 955 int pa_sink_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
 956     pa_sink *s = PA_SINK(o);
 957     pa_sink_assert_ref(s);
 958     pa_assert(s->thread_info.state != PA_SINK_UNLINKED);
 959
 960     switch ((pa_sink_message_t) code) {
 961
 962         case PA_SINK_MESSAGE_ADD_INPUT: {
 963             pa_sink_input *i = PA_SINK_INPUT(userdata);
 964
 965             pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index), pa_sink_input_ref(i));
 966
 967             /* Since the caller sleeps in pa_sink_input_put(), we can
 968              * safely access data outside of thread_info even though
 969              * it is mutable */
 970
 971             if ((i->thread_info.sync_prev = i->sync_prev)) {
 972                 pa_assert(i->sink == i->thread_info.sync_prev->sink);
 973                 pa_assert(i->sync_prev->sync_next == i);
 974                 i->thread_info.sync_prev->thread_info.sync_next = i;
 975             }
 976
 977             if ((i->thread_info.sync_next = i->sync_next)) {
 978                 pa_assert(i->sink == i->thread_info.sync_next->sink);
 979                 pa_assert(i->sync_next->sync_prev == i);
 980                 i->thread_info.sync_next->thread_info.sync_prev = i;
 981             }
 982
 983             pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
 984
 985             pa_assert(!i->thread_info.attached);
 986             i->thread_info.attached = TRUE;
 987
 988             if (i->attach)
 989                 i->attach(i);
 990
 991             /* If you change anything here, make sure to change the
 992              * ghost sink input handling a few lines down at
 993              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
 994
 995             pa_sink_invalidate_requested_latency(s);
 996
 997             /* Make sure we're not rewound when the hw buffer is remixed and request a remix*/
 998             i->thread_info.ignore_rewind = TRUE;
 999             i->thread_info.since_underrun = 0;
1000             pa_sink_request_rewind(s, 0);
1001
1002             return 0;
1003         }
1004
1005         case PA_SINK_MESSAGE_REMOVE_INPUT: {
1006             pa_sink_input *i = PA_SINK_INPUT(userdata);
1007
1008             /* If you change anything here, make sure to change the
1009              * sink input handling a few lines down at
1010              * PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, too. */
1011
1012             if (i->detach)
1013                 i->detach(i);
1014
1015             pa_assert(i->thread_info.attached);
1016             i->thread_info.attached = FALSE;
1017
1018             /* Since the caller sleeps in pa_sink_input_unlink(),
1019              * we can safely access data outside of thread_info even
1020              * though it is mutable */
1021
1022             pa_assert(!i->thread_info.sync_prev);
1023             pa_assert(!i->thread_info.sync_next);
1024
1025             if (i->thread_info.sync_prev) {
1026                 i->thread_info.sync_prev->thread_info.sync_next = i->thread_info.sync_prev->sync_next;
1027                 i->thread_info.sync_prev = NULL;
1028             }
1029
1030             if (i->thread_info.sync_next) {
1031                 i->thread_info.sync_next->thread_info.sync_prev = i->thread_info.sync_next->sync_prev;
1032                 i->thread_info.sync_next = NULL;
1033             }
1034
1035             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(i->index)))
1036                 pa_sink_input_unref(i);
1037
1038             pa_sink_invalidate_requested_latency(s);
1039
1040             pa_sink_request_rewind(s, 0);
1041
1042             return 0;
1043         }
1044
1045         case PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER: {
1046             pa_sink_input_move_info *info = userdata;
1047             int volume_is_norm;
1048
1049             /* We don't support moving synchronized streams. */
1050             pa_assert(!info->sink_input->sync_prev);
1051             pa_assert(!info->sink_input->sync_next);
1052             pa_assert(!info->sink_input->thread_info.sync_next);
1053             pa_assert(!info->sink_input->thread_info.sync_prev);
1054
1055             if (info->sink_input->detach)
1056                 info->sink_input->detach(info->sink_input);
1057
1058             pa_assert(info->sink_input->thread_info.attached);
1059             info->sink_input->thread_info.attached = FALSE;
1060             pa_sink_invalidate_requested_latency(info->sink_input->sink);
1061
1062             if (info->ghost_sink_input) {
1063                 pa_assert(info->buffer_bytes > 0);
1064                 pa_assert(info->buffer);
1065
1066                 volume_is_norm = pa_cvolume_is_norm(&info->sink_input->thread_info.volume);
1067
1068                 pa_log_debug("Buffering %lu bytes ...", (unsigned long) info->buffer_bytes);
1069
1070                 while (info->buffer_bytes > 0) {
1071                     pa_memchunk memchunk;
1072                     pa_cvolume volume;
1073                     size_t n;
1074
1075                     if (pa_sink_input_peek(info->sink_input, info->buffer_bytes, &memchunk, &volume) < 0)
1076                         break;
1077
1078                     n = memchunk.length > info->buffer_bytes ? info->buffer_bytes : memchunk.length;
1079                     pa_sink_input_drop(info->sink_input, n);
1080                     memchunk.length = n;
1081
1082                     if (!volume_is_norm) {
1083                         pa_memchunk_make_writable(&memchunk, 0);
1084                         pa_volume_memchunk(&memchunk, &s->sample_spec, &volume);
1085                     }
1086
1087                     if (pa_memblockq_push(info->buffer, &memchunk) < 0) {
1088                         pa_memblock_unref(memchunk.memblock);
1089                         break;
1090                     }
1091
1092                     pa_memblock_unref(memchunk.memblock);
1093                     info->buffer_bytes -= n;
1094                 }
1095
1096                 /* Add the remaining already resampled chunks to the buffer */
1097                 pa_memblockq_splice(info->buffer, info->sink_input->thread_info.render_memblockq);
1098
1099                 pa_memblockq_sink_input_set_queue(info->ghost_sink_input, info->buffer);
1100
1101                 pa_log_debug("Buffered %lu bytes ...", (unsigned long) pa_memblockq_get_length(info->buffer));
1102             }
1103
1104             /* Let's remove the sink input ...*/
1105             if (pa_hashmap_remove(s->thread_info.inputs, PA_UINT32_TO_PTR(info->sink_input->index)))
1106                 pa_sink_input_unref(info->sink_input);
1107
1108             /* .. and add the ghost sink input instead */
1109             if (info->ghost_sink_input) {
1110                 pa_hashmap_put(s->thread_info.inputs, PA_UINT32_TO_PTR(info->ghost_sink_input->index), pa_sink_input_ref(info->ghost_sink_input));
1111                 info->ghost_sink_input->thread_info.sync_prev = info->ghost_sink_input->thread_info.sync_next = NULL;
1112
1113                 pa_sink_input_update_max_rewind(info->ghost_sink_input, s->thread_info.max_rewind);
1114
1115                 pa_assert(!info->ghost_sink_input->thread_info.attached);
1116                 info->ghost_sink_input->thread_info.attached = TRUE;
1117
1118                 if (info->ghost_sink_input->attach)
1119                     info->ghost_sink_input->attach(info->ghost_sink_input);
1120
1121             }
1122
1123             pa_sink_invalidate_requested_latency(s);
1124
1125             pa_sink_request_rewind(s, 0);
1126
1127             return 0;
1128         }
1129
1130         case PA_SINK_MESSAGE_SET_VOLUME:
1131             s->thread_info.soft_volume = *((pa_cvolume*) userdata);
1132
1133             pa_sink_request_rewind(s, 0);
1134             return 0;
1135
1136         case PA_SINK_MESSAGE_SET_MUTE:
1137             s->thread_info.soft_muted = PA_PTR_TO_UINT(userdata);
1138
1139             pa_sink_request_rewind(s, 0);
1140             return 0;
1141
1142         case PA_SINK_MESSAGE_GET_VOLUME:
1143             *((pa_cvolume*) userdata) = s->thread_info.soft_volume;
1144             return 0;
1145
1146         case PA_SINK_MESSAGE_GET_MUTE:
1147             *((pa_bool_t*) userdata) = s->thread_info.soft_muted;
1148             return 0;
1149
1150         case PA_SINK_MESSAGE_SET_STATE:
1151
1152             s->thread_info.state = PA_PTR_TO_UINT(userdata);
1153             return 0;
1154
1155         case PA_SINK_MESSAGE_DETACH:
1156
1157             /* We're detaching all our input streams so that the
1158              * asyncmsgq and rtpoll fields can be changed without
1159              * problems */
1160             pa_sink_detach_within_thread(s);
1161             return 0;
1162
1163         case PA_SINK_MESSAGE_ATTACH:
1164
1165             /* Reattach all streams */
1166             pa_sink_attach_within_thread(s);
1167             return 0;
1168
1169         case PA_SINK_MESSAGE_GET_REQUESTED_LATENCY: {
1170
1171             pa_usec_t *usec = userdata;
1172             *usec = pa_sink_get_requested_latency_within_thread(s);
1173             return 0;
1174         }
1175
1176         case PA_SINK_MESSAGE_GET_LATENCY:
1177         case PA_SINK_MESSAGE_MAX:
1178             ;
1179     }
1180
1181     return -1;
1182 }
1183
1184 int pa_sink_suspend_all(pa_core *c, pa_bool_t suspend) {
1185     pa_sink *sink;
1186     uint32_t idx;
1187     int ret = 0;
1188
1189     pa_core_assert_ref(c);
1190
1191     for (sink = PA_SINK(pa_idxset_first(c->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(c->sinks, &idx)))
1192         ret -= pa_sink_suspend(sink, suspend) < 0;
1193
1194     return ret;
1195 }
1196
1197 void pa_sink_detach(pa_sink *s) {
1198     pa_sink_assert_ref(s);
1199     pa_assert(PA_SINK_LINKED(s->state));
1200
1201     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_DETACH, NULL, 0, NULL);
1202 }
1203
1204 void pa_sink_attach(pa_sink *s) {
1205     pa_sink_assert_ref(s);
1206     pa_assert(PA_SINK_LINKED(s->state));
1207
1208     pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_ATTACH, NULL, 0, NULL);
1209 }
1210
1211 void pa_sink_detach_within_thread(pa_sink *s) {
1212     pa_sink_input *i;
1213     void *state = NULL;
1214
1215     pa_sink_assert_ref(s);
1216     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1217
1218     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1219         if (i->detach)
1220             i->detach(i);
1221
1222     if (s->monitor_source)
1223         pa_source_detach_within_thread(s->monitor_source);
1224 }
1225
1226 void pa_sink_attach_within_thread(pa_sink *s) {
1227     pa_sink_input *i;
1228     void *state = NULL;
1229
1230     pa_sink_assert_ref(s);
1231     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1232
1233     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1234         if (i->attach)
1235             i->attach(i);
1236
1237     if (s->monitor_source)
1238         pa_source_attach_within_thread(s->monitor_source);
1239 }
1240
1241 void pa_sink_request_rewind(pa_sink*s, size_t nbytes) {
1242     pa_sink_assert_ref(s);
1243     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1244
1245     if (nbytes <= 0)
1246         nbytes = s->thread_info.max_rewind;
1247
1248     nbytes = PA_MIN(nbytes, s->thread_info.max_rewind);
1249
1250     if (nbytes <= s->thread_info.rewind_nbytes)
1251         return;
1252
1253     s->thread_info.rewind_nbytes = nbytes;
1254
1255     if (s->request_rewind)
1256         s->request_rewind(s);
1257 }
1258
1259 pa_usec_t pa_sink_get_requested_latency_within_thread(pa_sink *s) {
1260     pa_usec_t result = (pa_usec_t) -1;
1261     pa_sink_input *i;
1262     void *state = NULL;
1263
1264     pa_sink_assert_ref(s);
1265
1266     if (s->thread_info.requested_latency_valid)
1267         return s->thread_info.requested_latency;
1268
1269     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1270
1271         if (i->thread_info.requested_sink_latency != (pa_usec_t) -1 &&
1272             (result == (pa_usec_t) -1 || result > i->thread_info.requested_sink_latency))
1273             result = i->thread_info.requested_sink_latency;
1274
1275     if (result != (pa_usec_t) -1) {
1276         if (s->max_latency > 0 && result > s->max_latency)
1277             result = s->max_latency;
1278
1279         if (s->min_latency > 0 && result < s->min_latency)
1280             result = s->min_latency;
1281     }
1282
1283     s->thread_info.requested_latency = result;
1284     s->thread_info.requested_latency_valid = TRUE;
1285
1286     return result;
1287 }
1288
1289 pa_usec_t pa_sink_get_requested_latency(pa_sink *s) {
1290     pa_usec_t usec = 0;
1291
1292     pa_sink_assert_ref(s);
1293     pa_assert(PA_SINK_LINKED(s->state));
1294
1295     if (!PA_SINK_OPENED(s->state))
1296         return 0;
1297
1298     if (pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL) < 0)
1299         return 0;
1300
1301     if (usec == (pa_usec_t) -1)
1302         usec = s->max_latency;
1303
1304     return usec;
1305 }
1306
1307 void pa_sink_set_max_rewind(pa_sink *s, size_t max_rewind) {
1308     pa_sink_input *i;
1309     void *state = NULL;
1310
1311     pa_sink_assert_ref(s);
1312
1313     if (max_rewind == s->thread_info.max_rewind)
1314         return;
1315
1316     s->thread_info.max_rewind = max_rewind;
1317
1318     while ((i = pa_hashmap_iterate(s->thread_info.inputs, &state, NULL)))
1319         pa_sink_input_update_max_rewind(i, s->thread_info.max_rewind);
1320
1321     if (s->monitor_source)
1322         pa_source_set_max_rewind(s->monitor_source, s->thread_info.max_rewind);
1323 }
1324
1325 void pa_sink_invalidate_requested_latency(pa_sink *s) {
1326
1327     pa_sink_assert_ref(s);
1328     pa_assert(PA_SINK_LINKED(s->thread_info.state));
1329
1330     if (!s->thread_info.requested_latency_valid)
1331         return;
1332
1333     s->thread_info.requested_latency_valid = FALSE;
1334
1335     if (s->update_requested_latency)
1336         s->update_requested_latency(s);
1337 }