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     if (linked) {
 277         pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 278         source_output_set_state(o, PA_SOURCE_OUTPUT_UNLINKED);
 279         pa_source_update_status(o->source);
 280     } else
 281         o->state = PA_SOURCE_OUTPUT_UNLINKED;
 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(pa_source_output_refcnt(o) == 0);
 298
 299     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state))
 300         pa_source_output_unlink(o);
 301
 302     pa_log_info("Freeing output %u \"%s\"", o->index, pa_strnull(pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME)));
 303
 304     pa_assert(!o->thread_info.attached);
 305
 306     if (o->thread_info.delay_memblockq)
 307         pa_memblockq_free(o->thread_info.delay_memblockq);
 308
 309     if (o->thread_info.resampler)
 310         pa_resampler_free(o->thread_info.resampler);
 311
 312     if (o->proplist)
 313         pa_proplist_free(o->proplist);
 314
 315     pa_xfree(o->driver);
 316     pa_xfree(o);
 317 }
 318
 319 void pa_source_output_put(pa_source_output *o) {
 320     pa_source_output_state_t state;
 321     pa_source_output_assert_ref(o);
 322
 323     pa_assert(o->state == PA_SOURCE_OUTPUT_INIT);
 324     pa_assert(o->push);
 325
 326     state = o->flags & PA_SOURCE_OUTPUT_START_CORKED ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING;
 327
 328     update_n_corked(o, state);
 329     o->thread_info.state = o->state = state;
 330
 331     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 332
 333     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW, o->index);
 334     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PUT], o);
 335 }
 336
 337 void pa_source_output_kill(pa_source_output*o) {
 338     pa_source_output_assert_ref(o);
 339     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 340
 341     if (o->kill)
 342         o->kill(o);
 343 }
 344
 345 pa_usec_t pa_source_output_get_latency(pa_source_output *o) {
 346     pa_usec_t r = 0;
 347
 348     pa_source_output_assert_ref(o);
 349     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 350
 351     if (pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY, &r, 0, NULL) < 0)
 352         r = 0;
 353
 354     if (o->get_latency)
 355         r += o->get_latency(o);
 356
 357     return r;
 358 }
 359
 360 /* Called from thread context */
 361 void pa_source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 362     size_t length;
 363     size_t limit, mbs = 0;
 364
 365     pa_source_output_assert_ref(o);
 366     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 367     pa_assert(chunk);
 368     pa_assert(pa_frame_aligned(chunk->length, &o->source->sample_spec));
 369
 370     if (!o->push || o->state == PA_SOURCE_OUTPUT_CORKED)
 371         return;
 372
 373     pa_assert(o->state == PA_SOURCE_OUTPUT_RUNNING);
 374
 375     if (pa_memblockq_push(o->thread_info.delay_memblockq, chunk) < 0) {
 376         pa_log_debug("Delay queue overflow!");
 377         pa_memblockq_seek(o->thread_info.delay_memblockq, chunk->length, PA_SEEK_RELATIVE);
 378     }
 379
 380     limit = o->process_rewind ? 0 : o->source->thread_info.max_rewind;
 381
 382     /* Implement the delay queue */
 383     while ((length = pa_memblockq_get_length(o->thread_info.delay_memblockq)) > limit) {
 384         pa_memchunk qchunk;
 385
 386         length -= limit;
 387
 388         pa_assert_se(pa_memblockq_peek(o->thread_info.delay_memblockq, &qchunk) >= 0);
 389
 390         if (qchunk.length > length)
 391             qchunk.length = length;
 392
 393         pa_assert(qchunk.length > 0);
 394
 395         if (!o->thread_info.resampler)
 396             o->push(o, &qchunk);
 397         else {
 398             pa_memchunk rchunk;
 399
 400             if (mbs == 0)
 401                 mbs = pa_resampler_max_block_size(o->thread_info.resampler);
 402
 403             if (qchunk.length > mbs)
 404                 qchunk.length = mbs;
 405
 406             pa_resampler_run(o->thread_info.resampler, &qchunk, &rchunk);
 407
 408             if (rchunk.length > 0)
 409                 o->push(o, &rchunk);
 410
 411             pa_memblock_unref(rchunk.memblock);
 412         }
 413
 414         pa_memblock_unref(qchunk.memblock);
 415         pa_memblockq_drop(o->thread_info.delay_memblockq, qchunk.length);
 416     }
 417 }
 418
 419 /* Called from thread context */
 420 void pa_source_output_process_rewind(pa_source_output *o, size_t nbytes /* in sink sample spec */) {
 421     pa_source_output_assert_ref(o);
 422
 423     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 424     pa_assert(pa_frame_aligned(nbytes, &o->source->sample_spec));
 425
 426     if (nbytes <= 0)
 427         return;
 428
 429     if (o->process_rewind) {
 430         pa_assert(pa_memblockq_get_length(o->thread_info.delay_memblockq) == 0);
 431
 432         if (o->thread_info.resampler)
 433             nbytes = pa_resampler_result(o->thread_info.resampler, nbytes);
 434
 435         pa_log_debug("Have to rewind %lu bytes on implementor.", (unsigned long) nbytes);
 436
 437         if (nbytes > 0)
 438             o->process_rewind(o, nbytes);
 439
 440         if (o->thread_info.resampler)
 441             pa_resampler_reset(o->thread_info.resampler);
 442
 443     } else
 444         pa_memblockq_rewind(o->thread_info.delay_memblockq, nbytes);
 445 }
 446
 447 /* Called from thread context */
 448 void pa_source_output_update_max_rewind(pa_source_output *o, size_t nbytes  /* in the source's sample spec */) {
 449     pa_source_output_assert_ref(o);
 450     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 451     pa_assert(pa_frame_aligned(nbytes, &o->source->sample_spec));
 452
 453     if (o->update_max_rewind)
 454         o->update_max_rewind(o, o->thread_info.resampler ? pa_resampler_result(o->thread_info.resampler, nbytes) : nbytes);
 455 }
 456
 457 static pa_usec_t fixup_latency(pa_source *s, pa_usec_t usec) {
 458     pa_source_assert_ref(s);
 459
 460     if (usec == (pa_usec_t) -1)
 461         return usec;
 462
 463     if (s->max_latency > 0 && usec > s->max_latency)
 464         usec = s->max_latency;
 465
 466     if (s->min_latency > 0 && usec < s->min_latency)
 467         usec = s->min_latency;
 468
 469     return usec;
 470 }
 471
 472 pa_usec_t pa_source_output_set_requested_latency_within_thread(pa_source_output *o, pa_usec_t usec) {
 473
 474     usec = fixup_latency(o->source, usec);
 475
 476     o->thread_info.requested_source_latency = usec;
 477     pa_source_invalidate_requested_latency(o->source);
 478
 479     return usec;
 480 }
 481
 482 pa_usec_t pa_source_output_set_requested_latency(pa_source_output *o, pa_usec_t usec) {
 483     pa_source_output_assert_ref(o);
 484
 485     usec = fixup_latency(o->source, usec);
 486
 487     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state))
 488         pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY, NULL, (int64_t) usec, NULL, NULL);
 489     else {
 490         /* If this sink input is not realized yet, we have to touch
 491          * the thread info data directly */
 492         o->thread_info.requested_source_latency = usec;
 493         o->source->thread_info.requested_latency_valid = FALSE;
 494     }
 495
 496     return usec;
 497 }
 498
 499 void pa_source_output_cork(pa_source_output *o, pa_bool_t b) {
 500     pa_source_output_assert_ref(o);
 501     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 502
 503     source_output_set_state(o, b ? PA_SOURCE_OUTPUT_CORKED : PA_SOURCE_OUTPUT_RUNNING);
 504 }
 505
 506 int pa_source_output_set_rate(pa_source_output *o, uint32_t rate) {
 507     pa_source_output_assert_ref(o);
 508     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 509     pa_return_val_if_fail(o->thread_info.resampler, -1);
 510
 511     if (o->sample_spec.rate == rate)
 512         return 0;
 513
 514     o->sample_spec.rate = rate;
 515
 516     pa_asyncmsgq_post(o->source->asyncmsgq, PA_MSGOBJECT(o), PA_SOURCE_OUTPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
 517
 518     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 519     return 0;
 520 }
 521
 522 void pa_source_output_set_name(pa_source_output *o, const char *name) {
 523     const char *old;
 524     pa_source_output_assert_ref(o);
 525
 526     old = pa_proplist_gets(o->proplist, PA_PROP_MEDIA_NAME);
 527
 528     if (!old && !name)
 529         return;
 530
 531     if (old && name && !strcmp(old, name))
 532         return;
 533
 534     if (name)
 535         pa_proplist_sets(o->proplist, PA_PROP_MEDIA_NAME, name);
 536     else
 537         pa_proplist_unset(o->proplist, PA_PROP_MEDIA_NAME);
 538
 539     if (PA_SOURCE_OUTPUT_IS_LINKED(o->state)) {
 540         pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PROPLIST_CHANGED], o);
 541         pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 542     }
 543 }
 544
 545 pa_resample_method_t pa_source_output_get_resample_method(pa_source_output *o) {
 546     pa_source_output_assert_ref(o);
 547
 548     return o->resample_method;
 549 }
 550
 551 int pa_source_output_move_to(pa_source_output *o, pa_source *dest) {
 552     pa_source *origin;
 553     pa_resampler *new_resampler = NULL;
 554     pa_source_output_move_hook_data hook_data;
 555
 556     pa_source_output_assert_ref(o);
 557     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->state));
 558     pa_source_assert_ref(dest);
 559
 560     origin = o->source;
 561
 562     if (dest == origin)
 563         return 0;
 564
 565     if (o->flags & PA_SOURCE_OUTPUT_DONT_MOVE)
 566         return -1;
 567
 568     if (pa_idxset_size(dest->outputs) >= PA_MAX_OUTPUTS_PER_SOURCE) {
 569         pa_log_warn("Failed to move source output: too many outputs per source.");
 570         return -1;
 571     }
 572
 573     if (o->thread_info.resampler &&
 574         pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
 575         pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
 576
 577         /* Try to reuse the old resampler if possible */
 578         new_resampler = o->thread_info.resampler;
 579
 580     else if ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ||
 581              !pa_sample_spec_equal(&o->sample_spec, &dest->sample_spec) ||
 582              !pa_channel_map_equal(&o->channel_map, &dest->channel_map)) {
 583
 584         /* Okey, we need a new resampler for the new source */
 585
 586         if (!(new_resampler = pa_resampler_new(
 587                       dest->core->mempool,
 588                       &dest->sample_spec, &dest->channel_map,
 589                       &o->sample_spec, &o->channel_map,
 590                       o->resample_method,
 591                       ((o->flags & PA_SOURCE_OUTPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 592                       ((o->flags & PA_SOURCE_OUTPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 593                       (o->core->disable_remixing || (o->flags & PA_SOURCE_OUTPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 594             pa_log_warn("Unsupported resampling operation.");
 595             return -1;
 596         }
 597     }
 598
 599     hook_data.source_output = o;
 600     hook_data.destination = dest;
 601     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE], &hook_data);
 602
 603     /* Okey, let's move it */
 604     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
 605
 606     pa_idxset_remove_by_data(origin->outputs, o, NULL);
 607     pa_idxset_put(dest->outputs, o, NULL);
 608     o->source = dest;
 609
 610     if (pa_source_output_get_state(o) == PA_SOURCE_OUTPUT_CORKED) {
 611         pa_assert_se(origin->n_corked-- >= 1);
 612         dest->n_corked++;
 613     }
 614
 615     /* Replace resampler */
 616     if (new_resampler != o->thread_info.resampler) {
 617         if (o->thread_info.resampler)
 618             pa_resampler_free(o->thread_info.resampler);
 619         o->thread_info.resampler = new_resampler;
 620     }
 621
 622     pa_asyncmsgq_send(o->source->asyncmsgq, PA_MSGOBJECT(o->source), PA_SOURCE_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 623
 624     pa_source_update_status(origin);
 625     pa_source_update_status(dest);
 626
 627     if (o->moved)
 628         o->moved(o);
 629
 630     pa_hook_fire(&o->source->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE_POST], o);
 631
 632     pa_log_debug("Successfully moved source output %i from %s to %s.", o->index, origin->name, dest->name);
 633
 634     /* Notify everyone */
 635     pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
 636
 637     return 0;
 638 }
 639
 640 void pa_source_output_set_state_within_thread(pa_source_output *o, pa_source_output_state_t state) {
 641     pa_source_output_assert_ref(o);
 642
 643     if (o->state_change)
 644         o->state_change(o, state);
 645
 646     o->thread_info.state = state;
 647 }
 648
 649 /* Called from thread context */
 650 int pa_source_output_process_msg(pa_msgobject *mo, int code, void *userdata, int64_t offset, pa_memchunk* chunk) {
 651     pa_source_output *o = PA_SOURCE_OUTPUT(mo);
 652
 653     pa_source_output_assert_ref(o);
 654     pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
 655
 656     switch (code) {
 657
 658         case PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY: {
 659             pa_usec_t *r = userdata;
 660
 661             *r += pa_bytes_to_usec(pa_memblockq_get_length(o->thread_info.delay_memblockq), &o->source->sample_spec);
 662
 663             return 0;
 664         }
 665
 666         case PA_SOURCE_OUTPUT_MESSAGE_SET_RATE:
 667
 668             o->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
 669             pa_resampler_set_output_rate(o->thread_info.resampler, PA_PTR_TO_UINT(userdata));
 670             return 0;
 671
 672         case PA_SOURCE_OUTPUT_MESSAGE_SET_STATE:
 673
 674             pa_source_output_set_state_within_thread(o, PA_PTR_TO_UINT(userdata));
 675             return 0;
 676
 677         case PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY:
 678
 679             pa_source_output_set_requested_latency_within_thread(o, (pa_usec_t) offset);
 680             return 0;
 681     }
 682
 683     return -1;
 684 }