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 #define MEMBLOCKQ_MAXLENGTH (32*1024*1024)
  44
  45 static PA_DEFINE_CHECK_TYPE(pa_source_output, pa_msgobject);
  46
  47 static void source_output_free(pa_object* mo);
  48
  49 pa_source_output_new_data* pa_source_output_new_data_init(pa_source_output_new_data *data) {
  50     pa_assert(data);
  51
  52     memset(data, 0, sizeof(*data));
  53     data->resample_method = PA_RESAMPLER_INVALID;
  54     data->proplist = pa_proplist_new();
  55
  56     return data;
  57 }
  58
  59 void pa_source_output_new_data_set_sample_spec(pa_source_output_new_data *data, const pa_sample_spec *spec) {
  60     pa_assert(data);
  61
  62     if ((data->sample_spec_is_set = !!spec))
  63         data->sample_spec = *spec;
  64 }
  65
  66 void pa_source_output_new_data_set_channel_map(pa_source_output_new_data *data, const pa_channel_map *map) {
  67     pa_assert(data);
  68
  69     if ((data->channel_map_is_set = !!map))
  70         data->channel_map = *map;
  71 }
  72
  73 void pa_source_output_new_data_done(pa_source_output_new_data *data) {
  74     pa_assert(data);
  75
  76     pa_proplist_free(data->proplist);
  77 }
  78
  79 static void reset_callbacks(pa_source_output *o) {
  80     pa_assert(o);
  81
  82     o->push = NULL;
  83     o->process_rewind = NULL;
  84     o->update_max_rewind = NULL;
  85     o->attach = NULL;
  86     o->detach = NULL;
  87     o->suspend = NULL;
  88     o->moved = NULL;
  89     o->kill = NULL;
  90     o->get_latency = NULL;
  91     o->state_change = NULL;
  92 }
  93
  94 pa_source_output* pa_source_output_new(
  95         pa_core *core,
  96         pa_source_output_new_data *data,
  97         pa_source_output_flags_t flags) {
  98
  99     pa_source_output *o;
 100     pa_resampler *resampler = NULL;
 101     char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 102
 103     pa_assert(core);
 104     pa_assert(data);
 105
 106     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_NEW], data) < 0)
 107         return NULL;
 108
 109     pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
 110
 111     if (!data->source)
 112         data->source = pa_namereg_get(core, NULL, PA_NAMEREG_SOURCE, 1);
 113
 114     pa_return_null_if_fail(data->source);
 115     pa_return_null_if_fail(pa_source_get_state(data->source) != PA_SOURCE_UNLINKED);
 116
 117     if (!data->sample_spec_is_set)
 118         data->sample_spec = data->source->sample_spec;
 119
 120     pa_return_null_if_fail(pa_sample_spec_valid(&data->sample_spec));
 121
 122     if (!data->channel_map_is_set) {
 123         if (data->source->channel_map.channels == data->sample_spec.channels)
 124             data->channel_map = data->source->channel_map;
 125         else
 126             pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));
 127     }
 128
 129     pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
 130     pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);
 131
 132     if (flags & PA_SOURCE_OUTPUT_FIX_FORMAT)
 133         data->sample_spec.format = data->source->sample_spec.format;
 134
 135     if (flags & PA_SOURCE_OUTPUT_FIX_RATE)
 136         data->sample_spec.rate = data->source->sample_spec.rate;
 137
 138     if (flags & PA_SOURCE_OUTPUT_FIX_CHANNELS) {
 139         data->sample_spec.channels = data->source->sample_spec.channels;
 140         data->channel_map = data->source->channel_map;
 141     }
 142
 143     pa_assert(pa_sample_spec_valid(&data->sample_spec));
 144     pa_assert(pa_channel_map_valid(&data->channel_map));
 145
 146     if (data->resample_method == PA_RESAMPLER_INVALID)
 147         data->resample_method = core->resample_method;
 148
 149     pa_return_null_if_fail(data->resample_method < PA_RESAMPLER_MAX);
 150
 151     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_FIXATE], data) < 0)
 152         return NULL;
 153
 154     if (pa_idxset_size(data->source->outputs) >= PA_MAX_OUTPUTS_PER_SOURCE) {
 155         pa_log("Failed to create source output: too many outputs per source.");
 156         return NULL;
 157     }
 158
 159     if ((flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ||
 160         !pa_sample_spec_equal(&data->sample_spec, &data->source->sample_spec) ||
 161         !pa_channel_map_equal(&data->channel_map, &data->source->channel_map)) {
 162
 163         if (!(resampler = pa_resampler_new(
 164                       core->mempool,
 165                       &data->source->sample_spec, &data->source->channel_map,
 166                       &data->sample_spec, &data->channel_map,
 167                       data->resample_method,
 168                       ((flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 169                       ((flags & PA_SOURCE_OUTPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 170                       (core->disable_remixing || (flags & PA_SOURCE_OUTPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 171             pa_log_warn("Unsupported resampling operation.");
 172             return NULL;
 173         }
 174
 175         data->resample_method = pa_resampler_get_method(resampler);
 176     }
 177
 178     o = pa_msgobject_new(pa_source_output);
 179     o->parent.parent.free = source_output_free;
 180     o->parent.process_msg = pa_source_output_process_msg;
 181
 182     o->core = core;
 183     o->state = PA_SOURCE_OUTPUT_INIT;
 184     o->flags = flags;
 185     o->proplist = pa_proplist_copy(data->proplist);
 186     o->driver = pa_xstrdup(data->driver);
 187     o->module = data->module;
 188     o->source = data->source;
 189     o->client = data->client;
 190
 191     o->resample_method = data->resample_method;
 192     o->sample_spec = data->sample_spec;
 193     o->channel_map = data->channel_map;
 194
 195     reset_callbacks(o);
 196     o->userdata = NULL;
 197
 198     o->thread_info.state = o->state;
 199     o->thread_info.attached = FALSE;
 200     o->thread_info.sample_spec = o->sample_spec;
 201     o->thread_info.resampler = resampler;
 202     o->thread_info.requested_source_latency = (pa_usec_t) -1;
 203
 204     o->thread_info.delay_memblockq = pa_memblockq_new(
 205             0,
 206             MEMBLOCKQ_MAXLENGTH,
 207             0,
 208             pa_frame_size(&o->source->sample_spec),
 209             0,
 210             1,
 211             0,
 212             &o->source->silence);
 213
 214     pa_assert_se(pa_idxset_put(core->source_outputs, o, &o->index) == 0);
 215     pa_assert_se(pa_idxset_put(o->source->outputs, pa_source_output_ref(o), NULL) == 0);
 216
 217     pa_log_info("Created output %u \"%s\" on %s with sample spec %s and channel map %s",
 218                 o->index,
 219                 pa_strnull(pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME)),
 220                 o->source->name,
 221                 pa_sample_spec_snprint(st, sizeof(st), &o->sample_spec),
 222                 pa_channel_map_snprint(cm, sizeof(cm), &o->channel_map));
 223
 224     /* Don't forget to call pa_source_output_put! */
 225
 226     return o;
 227 }
 228
 229 static void update_n_corked(pa_source_output *o, pa_source_output_state_t state) {
 230     pa_assert(o);
 231
 232     if (o->state == PA_SOURCE_OUTPUT_CORKED && state != PA_SOURCE_OUTPUT_CORKED)
 233         pa_assert_se(o->source->n_corked -- >= 1);
 234     else if (o->state != PA_SOURCE_OUTPUT_CORKED && state == PA_SOURCE_OUTPUT_CORKED)
 235         o->source->n_corked++;
 236
 237     pa_source_update_status(o->source);
 238 }
 239
 240 static int source_output_set_state(pa_source_output *o, pa_source_output_state_t state) {
 241     pa_assert(o);
 242
 243     if (o->state == state)
 244         return 0;
 245
 246     if (pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) < 0)
 247         return -1;
 248
 249     update_n_corked(o, state);
 250     o->state = state;
 251
 252     if (state != PA_SOURCE_OUTPUT_UNLINKED)
 253         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_STATE_CHANGED], o);
 254
 255     return 0;
 256 }
 257
 258 void pa_source_output_unlink(pa_source_output*o) {
 259     pa_bool_t linked;
 260     pa_assert(o);
 261
 262     /* See pa_sink_unlink() for a couple of comments how this function
 263      * works */
 264
 265     pa_source_output_ref(o);
 266
 267     linked = PA_SOURCE_OUTPUT_IS_LINKED(o->state);
 268
 269     if (linked)
 270         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_UNLINK], o);
 271
 272     pa_idxset_remove_by_data(o->source->core->source_outputs, o, NULL);
 273     if (pa_idxset_remove_by_data(o->source->outputs, o, NULL))
 274         pa_source_output_unref(o);
 275
 276     update_n_corked(o, PA_SOURCE_OUTPUT_UNLINKED);
 277     o->state = PA_SOURCE_OUTPUT_UNLINKED;
 278
 279     if (linked)
 280         if (o->source->asyncmsgq)
 281             pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 282
 283     reset_callbacks(o);
 284
 285     if (linked) {
 286         pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_REMOVE, o->index);
 287         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_UNLINK_POST], o);
 288     }
 289
 290     o->source = NULL;
 291     pa_source_output_unref(o);
 292 }
 293
 294 static void source_output_free(pa_object* mo) {
 295     pa_source_output *o = PA_SOURCE_OUTPUT(mo);
 296
 297     pa_assert(o);
 298     pa_assert(pa_source_output_refcnt(o) == 0);
 299
 300     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state))
 301         pa_source_output_unlink(o);
 302
 303     pa_log_info("Freeing output %u \"%s\"", o->index, pa_strnull(pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME)));
 304
 305     pa_assert(!o->thread_info.attached);
 306
 307     if (o->thread_info.delay_memblockq)
 308         pa_memblockq_free(o->thread_info.delay_memblockq);
 309
 310     if (o->thread_info.resampler)
 311         pa_resampler_free(o->thread_info.resampler);
 312
 313     if (o->proplist)
 314         pa_proplist_free(o->proplist);
 315
 316     pa_xfree(o->driver);
 317     pa_xfree(o);
 318 }
 319
 320 void pa_source_output_put(pa_source_output *o) {
 321     pa_source_output_state_t state;
 322     pa_source_output_assert_ref(o);
 323
 324     pa_assert(o->state == PA_SOURCE_OUTPUT_INIT);
 325     pa_assert(o->push);
 326
 327     state = o->flags & PA_SOURCE_OUTPUT_START_CORKED ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING;
 328
 329     update_n_corked(o, state);
 330     o->state = state;
 331
 332     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 333
 334     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW, o->index);
 335     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PUT], o);
 336 }
 337
 338 void pa_source_output_kill(pa_source_output*o) {
 339     pa_source_output_assert_ref(o);
 340     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 341
 342     if (o->kill)
 343         o->kill(o);
 344 }
 345
 346 pa_usec_t pa_source_output_get_latency(pa_source_output *o) {
 347     pa_usec_t r = 0;
 348
 349     pa_source_output_assert_ref(o);
 350     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 351
 352     if (pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY, &r, 0, NULL) < 0)
 353         r = 0;
 354
 355     if (o->get_latency)
 356         r += o->get_latency(o);
 357
 358     return r;
 359 }
 360
 361 /* Called from thread context */
 362 void pa_source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 363     size_t length;
 364     size_t limit, mbs = 0;
 365
 366     pa_source_output_assert_ref(o);
 367     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 368     pa_assert(chunk);
 369     pa_assert(pa_frame_aligned(chunk->length, &o->source->sample_spec));
 370
 371     if (!o->push || o->state == PA_SOURCE_OUTPUT_CORKED)
 372         return;
 373
 374     pa_assert(o->state == PA_SOURCE_OUTPUT_RUNNING);
 375
 376     if (pa_memblockq_push(o->thread_info.delay_memblockq, chunk) < 0) {
 377         pa_log_debug("Delay queue overflow!");
 378         pa_memblockq_seek(o->thread_info.delay_memblockq, chunk->length, PA_SEEK_RELATIVE);
 379     }
 380
 381     limit = o->process_rewind ? 0 : o->source->thread_info.max_rewind;
 382
 383     /* Implement the delay queue */
 384     while ((length = pa_memblockq_get_length(o->thread_info.delay_memblockq)) > limit) {
 385         pa_memchunk qchunk;
 386
 387         length -= limit;
 388
 389         pa_assert_se(pa_memblockq_peek(o->thread_info.delay_memblockq, &qchunk) >= 0);
 390
 391         if (qchunk.length > length)
 392             qchunk.length = length;
 393
 394         pa_assert(qchunk.length > 0);
 395
 396         if (!o->thread_info.resampler)
 397             o->push(o, &qchunk);
 398         else {
 399             pa_memchunk rchunk;
 400
 401             if (mbs == 0)
 402                 mbs = pa_resampler_max_block_size(o->thread_info.resampler);
 403
 404             if (qchunk.length > mbs)
 405                 qchunk.length = mbs;
 406
 407             pa_resampler_run(o->thread_info.resampler, &qchunk, &rchunk);
 408
 409             if (rchunk.length > 0)
 410                 o->push(o, &rchunk);
 411
 412             pa_memblock_unref(rchunk.memblock);
 413         }
 414
 415         pa_memblock_unref(qchunk.memblock);
 416         pa_memblockq_drop(o->thread_info.delay_memblockq, qchunk.length);
 417     }
 418 }
 419
 420 /* Called from thread context */
 421 void pa_source_output_process_rewind(pa_source_output *o, size_t nbytes /* in sink sample spec */) {
 422     pa_source_output_assert_ref(o);
 423
 424     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 425     pa_assert(pa_frame_aligned(nbytes, &o->source->sample_spec));
 426
 427     if (nbytes <= 0)
 428         return;
 429
 430     if (o->process_rewind) {
 431         pa_assert(pa_memblockq_get_length(o->thread_info.delay_memblockq) == 0);
 432
 433         if (o->thread_info.resampler)
 434             nbytes = pa_resampler_result(o->thread_info.resampler, nbytes);
 435
 436         pa_log_debug("Have to rewind %lu bytes on implementor.", (unsigned long) nbytes);
 437
 438         if (nbytes > 0)
 439             o->process_rewind(o, nbytes);
 440
 441         if (o->thread_info.resampler)
 442             pa_resampler_reset(o->thread_info.resampler);
 443
 444     } else
 445         pa_memblockq_rewind(o->thread_info.delay_memblockq, nbytes);
 446 }
 447
 448 /* Called from thread context */
 449 void pa_source_output_update_max_rewind(pa_source_output *o, size_t nbytes  /* in the source's sample spec */) {
 450     pa_source_output_assert_ref(o);
 451     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 452     pa_assert(pa_frame_aligned(nbytes, &o->source->sample_spec));
 453
 454     if (o->update_max_rewind)
 455         o->update_max_rewind(o, o->thread_info.resampler ? pa_resampler_result(o->thread_info.resampler, nbytes) : nbytes);
 456 }
 457
 458 static pa_usec_t fixup_latency(pa_source *s, pa_usec_t usec) {
 459     pa_source_assert_ref(s);
 460
 461     if (usec == (pa_usec_t) -1)
 462         return usec;
 463
 464     if (s->max_latency > 0 && usec > s->max_latency)
 465         usec = s->max_latency;
 466
 467     if (s->min_latency > 0 && usec < s->min_latency)
 468         usec = s->min_latency;
 469
 470     return usec;
 471 }
 472
 473 pa_usec_t pa_source_output_set_requested_latency_within_thread(pa_source_output *o, pa_usec_t usec) {
 474     pa_source_output_assert_ref(o);
 475
 476     usec = fixup_latency(o->source, usec);
 477
 478     o->thread_info.requested_source_latency = usec;
 479     pa_source_invalidate_requested_latency(o->source);
 480
 481     return usec;
 482 }
 483
 484 pa_usec_t pa_source_output_set_requested_latency(pa_source_output *o, pa_usec_t usec) {
 485     pa_source_output_assert_ref(o);
 486
 487     usec = fixup_latency(o->source, usec);
 488
 489     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state))
 490         pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY, NULL, (int64_t) usec, NULL, NULL);
 491     else {
 492         /* If this sink input is not realized yet, we have to touch
 493          * the thread info data directly */
 494         o->thread_info.requested_source_latency = usec;
 495         o->source->thread_info.requested_latency_valid = FALSE;
 496     }
 497
 498     return usec;
 499 }
 500
 501 pa_usec_t pa_source_output_get_requested_latency(pa_source_output *o) {
 502     pa_usec_t usec = 0;
 503
 504     pa_source_output_assert_ref(o);
 505
 506     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state))
 507         pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL);
 508     else
 509         /* If this sink input is not realized yet, we have to touch
 510          * the thread info data directly */
 511         usec = o->thread_info.requested_source_latency;
 512
 513     return usec;
 514 }
 515
 516 void pa_source_output_cork(pa_source_output *o, pa_bool_t b) {
 517     pa_source_output_assert_ref(o);
 518     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 519
 520     source_output_set_state(o, b ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING);
 521 }
 522
 523 int pa_source_output_set_rate(pa_source_output *o, uint32_t rate) {
 524     pa_source_output_assert_ref(o);
 525     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 526     pa_return_val_if_fail(o->thread_info.resampler, -1);
 527
 528     if (o->sample_spec.rate == rate)
 529         return 0;
 530
 531     o->sample_spec.rate = rate;
 532
 533     pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
 534
 535     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 536     return 0;
 537 }
 538
 539 void pa_source_output_set_name(pa_source_output *o, const char *name) {
 540     const char *old;
 541     pa_source_output_assert_ref(o);
 542
 543     if (!name && !pa_proplist_contains(o->proplist, PA_PROP_MEDIA_NAME))
 544         return;
 545
 546     old = pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME);
 547
 548     if (old && name && !strcmp(old, name))
 549         return;
 550
 551     if (name)
 552         pa_proplist_sets(o->proplist, PA_PROP_MEDIA_NAME, name);
 553     else
 554         pa_proplist_unset(o->proplist, PA_PROP_MEDIA_NAME);
 555
 556     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state)) {
 557         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PROPLIST_CHANGED], o);
 558         pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 559     }
 560 }
 561
 562 pa_resample_method_t pa_source_output_get_resample_method(pa_source_output *o) {
 563     pa_source_output_assert_ref(o);
 564
 565     return o->resample_method;
 566 }
 567
 568 int pa_source_output_move_to(pa_source_output *o, pa_source *dest) {
 569     pa_source *origin;
 570     pa_resampler *new_resampler;
 571     pa_source_output_move_hook_data hook_data;
 572
 573     pa_source_output_assert_ref(o);
 574     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 575     pa_source_assert_ref(dest);
 576
 577     origin = o->source;
 578
 579     if (dest == origin)
 580         return 0;
 581
 582     if (o->flags & PA_SOURCE_OUTPUT_DONT_MOVE)
 583         return -1;
 584
 585     if (pa_idxset_size(dest->outputs) >= PA_MAX_OUTPUTS_PER_SOURCE) {
 586         pa_log_warn("Failed to move source output: too many outputs per source.");
 587         return -1;
 588     }
 589
 590     if (o->thread_info.resampler &&
 591         pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
 592         pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
 593
 594         /* Try to reuse the old resampler if possible */
 595         new_resampler = o->thread_info.resampler;
 596
 597     else if ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ||
 598              !pa_sample_spec_equal(&o->sample_spec, &dest->sample_spec) ||
 599              !pa_channel_map_equal(&o->channel_map, &dest->channel_map)) {
 600
 601         /* Okey, we need a new resampler for the new source */
 602
 603         if (!(new_resampler = pa_resampler_new(
 604                       dest->core->mempool,
 605                       &dest->sample_spec, &dest->channel_map,
 606                       &o->sample_spec, &o->channel_map,
 607                       o->resample_method,
 608                       ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 609                       ((o->flags & PA_SOURCE_OUTPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 610                       (o->core->disable_remixing || (o->flags & PA_SOURCE_OUTPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 611             pa_log_warn("Unsupported resampling operation.");
 612             return -1;
 613         }
 614     } else
 615         new_resampler = NULL;
 616
 617     hook_data.source_output = o;
 618     hook_data.destination = dest;
 619     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE], &hook_data);
 620
 621     /* Okey, let's move it */
 622     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 623
 624     pa_idxset_remove_by_data(origin->outputs, o, NULL);
 625     pa_idxset_put(dest->outputs, o, NULL);
 626     o->source = dest;
 627
 628     if (pa_source_output_get_state(o) == PA_SOURCE_OUTPUT_CORKED) {
 629         pa_assert_se(origin->n_corked-- >= 1);
 630         dest->n_corked++;
 631     }
 632
 633     /* Replace resampler */
 634     if (new_resampler != o->thread_info.resampler) {
 635         if (o->thread_info.resampler)
 636             pa_resampler_free(o->thread_info.resampler);
 637         o->thread_info.resampler = new_resampler;
 638     }
 639
 640     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 641
 642     pa_source_update_status(origin);
 643     pa_source_update_status(dest);
 644
 645     if (o->moved)
 646         o->moved(o);
 647
 648     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE_POST], o);
 649
 650     pa_log_debug("Successfully moved source output %i from %s to %s.", o->index, origin->name, dest->name);
 651
 652     /* Notify everyone */
 653     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 654
 655     return 0;
 656 }
 657
 658 void pa_source_output_set_state_within_thread(pa_source_output *o, pa_source_output_state_t state) {
 659     pa_source_output_assert_ref(o);
 660
 661     if (state == o->thread_info.state)
 662         return;
 663
 664     if (o->state_change)
 665         o->state_change(o, state);
 666
 667     o->thread_info.state = state;
 668 }
 669
 670 /* Called from thread context */
 671 int pa_source_output_process_msg(pa_msgobject *mo, int code, void *userdata, int64_t offset, pa_memchunk* chunk) {
 672     pa_source_output *o = PA_SOURCE_OUTPUT(mo);
 673
 674     pa_source_output_assert_ref(o);
 675     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 676
 677     switch (code) {
 678
 679         case PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY: {
 680             pa_usec_t *r = userdata;
 681
 682             *r += pa_bytes_to_usec(pa_memblockq_get_length(o->thread_info.delay_memblockq), &o->source->sample_spec);
 683             return 0;
 684         }
 685
 686         case PA_SOURCE_OUTPUT_MESSAGE_SET_RATE:
 687
 688             o->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
 689             pa_resampler_set_output_rate(o->thread_info.resampler, PA_PTR_TO_UINT(userdata));
 690             return 0;
 691
 692         case PA_SOURCE_OUTPUT_MESSAGE_SET_STATE:
 693
 694             pa_source_output_set_state_within_thread(o, PA_PTR_TO_UINT(userdata));
 695             return 0;
 696
 697         case PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY:
 698
 699             pa_source_output_set_requested_latency_within_thread(o, (pa_usec_t) offset);
 700             return 0;
 701
 702         case PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY: {
 703             pa_usec_t *r = userdata;
 704
 705             *r = o->thread_info.requested_source_latency;
 706             return 0;
 707         }
 708     }
 709
 710     return -1;
 711 }