code.delx.au - pulseaudio/blob - src/pulsecore/source-output.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <pulse/utf8.h>
  33 #include <pulse/xmalloc.h>
  34
  35 #include <pulsecore/sample-util.h>
  36 #include <pulsecore/core-subscribe.h>
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/namereg.h>
  39 #include <pulsecore/core-util.h>
  40
  41 #include "source-output.h"
  42
  43 static PA_DEFINE_CHECK_TYPE(pa_source_output, pa_msgobject);
  44
  45 static void source_output_free(pa_object* mo);
  46
  47 pa_source_output_new_data* pa_source_output_new_data_init(pa_source_output_new_data *data) {
  48     pa_assert(data);
  49
  50     memset(data, 0, sizeof(*data));
  51     data->resample_method = PA_RESAMPLER_INVALID;
  52     data->proplist = pa_proplist_new();
  53
  54     return data;
  55 }
  56
  57 void pa_source_output_new_data_set_sample_spec(pa_source_output_new_data *data, const pa_sample_spec *spec) {
  58     pa_assert(data);
  59
  60     if ((data->sample_spec_is_set = !!spec))
  61         data->sample_spec = *spec;
  62 }
  63
  64 void pa_source_output_new_data_set_channel_map(pa_source_output_new_data *data, const pa_channel_map *map) {
  65     pa_assert(data);
  66
  67     if ((data->channel_map_is_set = !!map))
  68         data->channel_map = *map;
  69 }
  70
  71 void pa_source_output_new_data_done(pa_source_output_new_data *data) {
  72     pa_assert(data);
  73
  74     pa_proplist_free(data->proplist);
  75 }
  76
  77 pa_source_output* pa_source_output_new(
  78         pa_core *core,
  79         pa_source_output_new_data *data,
  80         pa_source_output_flags_t flags) {
  81
  82     pa_source_output *o;
  83     pa_resampler *resampler = NULL;
  84     char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
  85
  86     pa_assert(core);
  87     pa_assert(data);
  88
  89     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_NEW], data) < 0)
  90         return NULL;
  91
  92     pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
  93
  94     if (!data->source)
  95         data->source = pa_namereg_get(core, NULL, PA_NAMEREG_SOURCE, 1);
  96
  97     pa_return_null_if_fail(data->source);
  98     pa_return_null_if_fail(pa_source_get_state(data->source) != PA_SOURCE_UNLINKED);
  99
 100     if (!data->sample_spec_is_set)
 101         data->sample_spec = data->source->sample_spec;
 102
 103     pa_return_null_if_fail(pa_sample_spec_valid(&data->sample_spec));
 104
 105     if (!data->channel_map_is_set) {
 106         if (data->source->channel_map.channels == data->sample_spec.channels)
 107             data->channel_map = data->source->channel_map;
 108         else
 109             pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));
 110     }
 111
 112     pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
 113     pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);
 114
 115     if (flags & PA_SOURCE_OUTPUT_FIX_FORMAT)
 116         data->sample_spec.format = data->source->sample_spec.format;
 117
 118     if (flags & PA_SOURCE_OUTPUT_FIX_RATE)
 119         data->sample_spec.rate = data->source->sample_spec.rate;
 120
 121     if (flags & PA_SOURCE_OUTPUT_FIX_CHANNELS) {
 122         data->sample_spec.channels = data->source->sample_spec.channels;
 123         data->channel_map = data->source->channel_map;
 124     }
 125
 126     pa_assert(pa_sample_spec_valid(&data->sample_spec));
 127     pa_assert(pa_channel_map_valid(&data->channel_map));
 128
 129     if (data->resample_method == PA_RESAMPLER_INVALID)
 130         data->resample_method = core->resample_method;
 131
 132     pa_return_null_if_fail(data->resample_method < PA_RESAMPLER_MAX);
 133
 134     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_FIXATE], data) < 0)
 135         return NULL;
 136
 137     if (pa_idxset_size(data->source->outputs) >= PA_MAX_OUTPUTS_PER_SOURCE) {
 138         pa_log("Failed to create source output: too many outputs per source.");
 139         return NULL;
 140     }
 141
 142     if ((flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ||
 143         !pa_sample_spec_equal(&data->sample_spec, &data->source->sample_spec) ||
 144         !pa_channel_map_equal(&data->channel_map, &data->source->channel_map)) {
 145
 146         if (!(resampler = pa_resampler_new(
 147                       core->mempool,
 148                       &data->source->sample_spec, &data->source->channel_map,
 149                       &data->sample_spec, &data->channel_map,
 150                       data->resample_method,
 151                       ((flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 152                       ((flags & PA_SOURCE_OUTPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 153                       (core->disable_remixing || (flags & PA_SOURCE_OUTPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 154             pa_log_warn("Unsupported resampling operation.");
 155             return NULL;
 156         }
 157
 158         data->resample_method = pa_resampler_get_method(resampler);
 159     }
 160
 161     o = pa_msgobject_new(pa_source_output);
 162     o->parent.parent.free = source_output_free;
 163     o->parent.process_msg = pa_source_output_process_msg;
 164
 165     o->core = core;
 166     o->state = PA_SOURCE_OUTPUT_INIT;
 167     o->flags = flags;
 168     o->proplist = pa_proplist_copy(data->proplist);
 169     o->driver = pa_xstrdup(data->driver);
 170     o->module = data->module;
 171     o->source = data->source;
 172     o->client = data->client;
 173
 174     o->resample_method = data->resample_method;
 175     o->sample_spec = data->sample_spec;
 176     o->channel_map = data->channel_map;
 177
 178     o->push = NULL;
 179     o->kill = NULL;
 180     o->get_latency = NULL;
 181     o->detach = NULL;
 182     o->attach = NULL;
 183     o->suspend = NULL;
 184     o->moved = NULL;
 185     o->userdata = NULL;
 186
 187     o->thread_info.state = o->state;
 188     o->thread_info.attached = FALSE;
 189     o->thread_info.sample_spec = o->sample_spec;
 190     o->thread_info.resampler = resampler;
 191     o->thread_info.requested_source_latency = 0;
 192
 193     pa_assert_se(pa_idxset_put(core->source_outputs, o, &o->index) == 0);
 194     pa_assert_se(pa_idxset_put(o->source->outputs, pa_source_output_ref(o), NULL) == 0);
 195
 196     pa_log_info("Created output %u \"%s\" on %s with sample spec %s and channel map %s",
 197                 o->index,
 198                 pa_strnull(pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME)),
 199                 o->source->name,
 200                 pa_sample_spec_snprint(st, sizeof(st), &o->sample_spec),
 201                 pa_channel_map_snprint(cm, sizeof(cm), &o->channel_map));
 202
 203     /* Don't forget to call pa_source_output_put! */
 204
 205     return o;
 206 }
 207
 208 static int source_output_set_state(pa_source_output *o, pa_source_output_state_t state) {
 209     pa_assert(o);
 210
 211     if (o->state == state)
 212         return 0;
 213
 214     if (pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) < 0)
 215         return -1;
 216
 217     if (o->state == PA_SOURCE_OUTPUT_CORKED && state != PA_SOURCE_OUTPUT_CORKED)
 218         pa_assert_se(o->source->n_corked -- >= 1);
 219     else if (o->state != PA_SOURCE_OUTPUT_CORKED && state == PA_SOURCE_OUTPUT_CORKED)
 220         o->source->n_corked++;
 221
 222     pa_source_update_status(o->source);
 223     o->state = state;
 224
 225     if (state != PA_SOURCE_OUTPUT_UNLINKED)
 226         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_STATE_CHANGED], o);
 227
 228     return 0;
 229 }
 230
 231 void pa_source_output_unlink(pa_source_output*o) {
 232     pa_bool_t linked;
 233     pa_assert(o);
 234
 235     /* See pa_sink_unlink() for a couple of comments how this function
 236      * works */
 237
 238     pa_source_output_ref(o);
 239
 240     linked = PA_SOURCE_OUTPUT_LINKED(o->state);
 241
 242     if (linked)
 243         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_UNLINK], o);
 244
 245     pa_idxset_remove_by_data(o->source->core->source_outputs, o, NULL);
 246     if (pa_idxset_remove_by_data(o->source->outputs, o, NULL))
 247         pa_source_output_unref(o);
 248
 249     if (linked) {
 250         pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 251         source_output_set_state(o, PA_SOURCE_OUTPUT_UNLINKED);
 252         pa_source_update_status(o->source);
 253     } else
 254         o->state = PA_SOURCE_OUTPUT_UNLINKED;
 255
 256     o->push = NULL;
 257     o->kill = NULL;
 258     o->get_latency = NULL;
 259     o->attach = NULL;
 260     o->detach = NULL;
 261     o->suspend = NULL;
 262     o->moved = NULL;
 263
 264     if (linked) {
 265         pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_REMOVE, o->index);
 266         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_UNLINK_POST], o);
 267     }
 268
 269     o->source = NULL;
 270     pa_source_output_unref(o);
 271 }
 272
 273 static void source_output_free(pa_object* mo) {
 274     pa_source_output *o = PA_SOURCE_OUTPUT(mo);
 275
 276     pa_assert(pa_source_output_refcnt(o) == 0);
 277
 278     if (PA_SOURCE_OUTPUT_LINKED(o->state))
 279         pa_source_output_unlink(o);
 280
 281     pa_log_info("Freeing output %u \"%s\"", o->index, pa_strnull(pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME)));
 282
 283     pa_assert(!o->thread_info.attached);
 284
 285     if (o->thread_info.resampler)
 286         pa_resampler_free(o->thread_info.resampler);
 287
 288     if (o->proplist)
 289         pa_proplist_free(o->proplist);
 290
 291     pa_xfree(o->driver);
 292     pa_xfree(o);
 293 }
 294
 295 void pa_source_output_put(pa_source_output *o) {
 296     pa_source_output_assert_ref(o);
 297
 298     pa_assert(o->state == PA_SOURCE_OUTPUT_INIT);
 299     pa_assert(o->push);
 300
 301     o->thread_info.state = o->state = o->flags & PA_SOURCE_OUTPUT_START_CORKED ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING;
 302
 303     if (o->state == PA_SOURCE_OUTPUT_CORKED)
 304         o->source->n_corked++;
 305
 306     pa_source_update_status(o->source);
 307     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 308
 309     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW, o->index);
 310     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PUT], o);
 311 }
 312
 313 void pa_source_output_kill(pa_source_output*o) {
 314     pa_source_output_assert_ref(o);
 315     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 316
 317     if (o->kill)
 318         o->kill(o);
 319 }
 320
 321 pa_usec_t pa_source_output_get_latency(pa_source_output *o) {
 322     pa_usec_t r = 0;
 323
 324     pa_source_output_assert_ref(o);
 325     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 326
 327     if (pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY, &r, 0, NULL) < 0)
 328         r = 0;
 329
 330     if (o->get_latency)
 331         r += o->get_latency(o);
 332
 333     return r;
 334 }
 335
 336 /* Called from thread context */
 337 void pa_source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 338     pa_memchunk rchunk;
 339
 340     pa_source_output_assert_ref(o);
 341     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->thread_info.state));
 342     pa_assert(chunk);
 343     pa_assert(pa_frame_aligned(chunk->length, &o->source->sample_spec));
 344
 345     if (!o->push || o->state == PA_SOURCE_OUTPUT_CORKED)
 346         return;
 347
 348     pa_assert(o->state == PA_SOURCE_OUTPUT_RUNNING);
 349
 350     if (!o->thread_info.resampler) {
 351         o->push(o, chunk);
 352         return;
 353     }
 354
 355     pa_resampler_run(o->thread_info.resampler, chunk, &rchunk);
 356     if (!rchunk.length)
 357         return;
 358
 359     pa_assert(rchunk.memblock);
 360     o->push(o, &rchunk);
 361     pa_memblock_unref(rchunk.memblock);
 362 }
 363
 364 pa_usec_t pa_source_output_set_requested_latency(pa_source_output *o, pa_usec_t usec) {
 365     pa_source_output_assert_ref(o);
 366     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 367
 368     if (usec > 0) {
 369
 370         if (o->source->max_latency > 0 && usec > o->source->max_latency)
 371             usec = o->source->max_latency;
 372
 373         if (o->source->min_latency > 0 && usec < o->source->min_latency)
 374             usec = o->source->min_latency;
 375
 376     }
 377
 378     if (PA_SOURCE_OUTPUT_LINKED(o->state))
 379         pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY, NULL, (int64_t) usec, NULL, NULL);
 380     else {
 381         o->thread_info.requested_source_latency = usec;
 382         o->source->thread_info.requested_latency_valid = FALSE;
 383     }
 384
 385     return usec;
 386 }
 387
 388 void pa_source_output_cork(pa_source_output *o, pa_bool_t b) {
 389     pa_source_output_assert_ref(o);
 390     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 391
 392     source_output_set_state(o, b ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING);
 393 }
 394
 395 int pa_source_output_set_rate(pa_source_output *o, uint32_t rate) {
 396     pa_source_output_assert_ref(o);
 397     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 398     pa_return_val_if_fail(o->thread_info.resampler, -1);
 399
 400     if (o->sample_spec.rate == rate)
 401         return 0;
 402
 403     o->sample_spec.rate = rate;
 404
 405     pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
 406
 407     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 408     return 0;
 409 }
 410
 411 void pa_source_output_set_name(pa_source_output *o, const char *name) {
 412     const char *old;
 413     pa_source_output_assert_ref(o);
 414
 415     old = pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME);
 416
 417     if (!old && !name)
 418         return;
 419
 420     if (old && name && !strcmp(old, name))
 421         return;
 422
 423     if (name)
 424         pa_proplist_sets(o->proplist, PA_PROP_MEDIA_NAME, name);
 425     else
 426         pa_proplist_unset(o->proplist, PA_PROP_MEDIA_NAME);
 427
 428     if (PA_SOURCE_OUTPUT_LINKED(o->state)) {
 429         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PROPLIST_CHANGED], o);
 430         pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 431     }
 432 }
 433
 434 pa_resample_method_t pa_source_output_get_resample_method(pa_source_output *o) {
 435     pa_source_output_assert_ref(o);
 436
 437     return o->resample_method;
 438 }
 439
 440 int pa_source_output_move_to(pa_source_output *o, pa_source *dest) {
 441     pa_source *origin;
 442     pa_resampler *new_resampler = NULL;
 443     pa_source_output_move_hook_data hook_data;
 444
 445     pa_source_output_assert_ref(o);
 446     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->state));
 447     pa_source_assert_ref(dest);
 448
 449     origin = o->source;
 450
 451     if (dest == origin)
 452         return 0;
 453
 454     if (o->flags & PA_SOURCE_OUTPUT_DONT_MOVE)
 455         return -1;
 456
 457     if (pa_idxset_size(dest->outputs) >= PA_MAX_OUTPUTS_PER_SOURCE) {
 458         pa_log_warn("Failed to move source output: too many outputs per source.");
 459         return -1;
 460     }
 461
 462     if (o->thread_info.resampler &&
 463         pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
 464         pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
 465
 466         /* Try to reuse the old resampler if possible */
 467         new_resampler = o->thread_info.resampler;
 468
 469     else if ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ||
 470              !pa_sample_spec_equal(&o->sample_spec, &dest->sample_spec) ||
 471              !pa_channel_map_equal(&o->channel_map, &dest->channel_map)) {
 472
 473         /* Okey, we need a new resampler for the new source */
 474
 475         if (!(new_resampler = pa_resampler_new(
 476                       dest->core->mempool,
 477                       &dest->sample_spec, &dest->channel_map,
 478                       &o->sample_spec, &o->channel_map,
 479                       o->resample_method,
 480                       ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 481                       ((o->flags & PA_SOURCE_OUTPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 482                       (o->core->disable_remixing || (o->flags & PA_SOURCE_OUTPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 483             pa_log_warn("Unsupported resampling operation.");
 484             return -1;
 485         }
 486     }
 487
 488     hook_data.source_output = o;
 489     hook_data.destination = dest;
 490     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE], &hook_data);
 491
 492     /* Okey, let's move it */
 493     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 494
 495     pa_idxset_remove_by_data(origin->outputs, o, NULL);
 496     pa_idxset_put(dest->outputs, o, NULL);
 497     o->source = dest;
 498
 499     if (pa_source_output_get_state(o) == PA_SOURCE_OUTPUT_CORKED) {
 500         pa_assert_se(origin->n_corked-- >= 1);
 501         dest->n_corked++;
 502     }
 503
 504     /* Replace resampler */
 505     if (new_resampler != o->thread_info.resampler) {
 506         if (o->thread_info.resampler)
 507             pa_resampler_free(o->thread_info.resampler);
 508         o->thread_info.resampler = new_resampler;
 509     }
 510
 511     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 512
 513     pa_source_update_status(origin);
 514     pa_source_update_status(dest);
 515
 516     if (o->moved)
 517         o->moved(o);
 518
 519     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE_POST], o);
 520
 521     pa_log_debug("Successfully moved source output %i from %s to %s.", o->index, origin->name, dest->name);
 522
 523     /* Notify everyone */
 524     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 525
 526     return 0;
 527 }
 528
 529 /* Called from thread context */
 530 int pa_source_output_process_msg(pa_msgobject *mo, int code, void *userdata, int64_t offset, pa_memchunk* chunk) {
 531     pa_source_output *o = PA_SOURCE_OUTPUT(mo);
 532
 533     pa_source_output_assert_ref(o);
 534     pa_assert(PA_SOURCE_OUTPUT_LINKED(o->thread_info.state));
 535
 536     switch (code) {
 537
 538         case PA_SOURCE_OUTPUT_MESSAGE_SET_RATE: {
 539
 540             o->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
 541             pa_resampler_set_output_rate(o->thread_info.resampler, PA_PTR_TO_UINT(userdata));
 542
 543             return 0;
 544         }
 545
 546         case PA_SOURCE_OUTPUT_MESSAGE_SET_STATE: {
 547             o->thread_info.state = PA_PTR_TO_UINT(userdata);
 548
 549             return 0;
 550         }
 551
 552         case PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY:
 553
 554             o->thread_info.requested_source_latency = (pa_usec_t) offset;
 555             pa_source_invalidate_requested_latency(o->source);
 556
 557             return 0;
 558     }
 559
 560     return -1;
 561 }