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