src/pulsecore/sink-input.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include <pulse/utf8.h>
  32 #include <pulse/xmalloc.h>
  33
  34 #include <pulsecore/sample-util.h>
  35 #include <pulsecore/core-subscribe.h>
  36 #include <pulsecore/log.h>
  37 #include <pulsecore/play-memblockq.h>
  38 #include <pulsecore/namereg.h>
  39 #include <pulsecore/core-util.h>
  40
  41 #include "sink-input.h"
  42
  43 #define MEMBLOCKQ_MAXLENGTH (32*1024*1024)
  44 #define CONVERT_BUFFER_LENGTH (PA_PAGE_SIZE)
  45
  46 static PA_DEFINE_CHECK_TYPE(pa_sink_input, pa_msgobject);
  47
  48 static void sink_input_free(pa_object *o);
  49
  50 pa_sink_input_new_data* pa_sink_input_new_data_init(pa_sink_input_new_data *data) {
  51     pa_assert(data);
  52
  53     memset(data, 0, sizeof(*data));
  54     data->resample_method = PA_RESAMPLER_INVALID;
  55     data->proplist = pa_proplist_new();
  56
  57     return data;
  58 }
  59
  60 void pa_sink_input_new_data_set_sample_spec(pa_sink_input_new_data *data, const pa_sample_spec *spec) {
  61     pa_assert(data);
  62
  63     if ((data->sample_spec_is_set = !!spec))
  64         data->sample_spec = *spec;
  65 }
  66
  67 void pa_sink_input_new_data_set_channel_map(pa_sink_input_new_data *data, const pa_channel_map *map) {
  68     pa_assert(data);
  69
  70     if ((data->channel_map_is_set = !!map))
  71         data->channel_map = *map;
  72 }
  73
  74 void pa_sink_input_new_data_set_volume(pa_sink_input_new_data *data, const pa_cvolume *volume) {
  75     pa_assert(data);
  76
  77     if ((data->volume_is_set = !!volume))
  78         data->volume = *volume;
  79 }
  80
  81 void pa_sink_input_new_data_set_muted(pa_sink_input_new_data *data, pa_bool_t mute) {
  82     pa_assert(data);
  83
  84     data->muted_is_set = TRUE;
  85     data->muted = !!mute;
  86 }
  87
  88 void pa_sink_input_new_data_done(pa_sink_input_new_data *data) {
  89     pa_assert(data);
  90
  91     pa_proplist_free(data->proplist);
  92 }
  93
  94 /* Called from main context */
  95 static void reset_callbacks(pa_sink_input *i) {
  96     pa_assert(i);
  97
  98     i->pop = NULL;
  99     i->process_rewind = NULL;
 100     i->update_max_rewind = NULL;
 101     i->update_max_request = NULL;
 102     i->update_sink_requested_latency = NULL;
 103     i->update_sink_latency_range = NULL;
 104     i->attach = NULL;
 105     i->detach = NULL;
 106     i->suspend = NULL;
 107     i->moved = NULL;
 108     i->kill = NULL;
 109     i->get_latency = NULL;
 110     i->state_change = NULL;
 111 }
 112
 113 /* Called from main context */
 114 pa_sink_input* pa_sink_input_new(
 115         pa_core *core,
 116         pa_sink_input_new_data *data,
 117         pa_sink_input_flags_t flags) {
 118
 119     pa_sink_input *i;
 120     pa_resampler *resampler = NULL;
 121     char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 122
 123     pa_assert(core);
 124     pa_assert(data);
 125
 126     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_INPUT_NEW], data) < 0)
 127         return NULL;
 128
 129     pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
 130
 131     if (!data->sink)
 132         data->sink = pa_namereg_get(core, NULL, PA_NAMEREG_SINK, TRUE);
 133
 134     pa_return_null_if_fail(data->sink);
 135     pa_return_null_if_fail(pa_sink_get_state(data->sink) != PA_SINK_UNLINKED);
 136     pa_return_null_if_fail(!data->sync_base || (data->sync_base->sink == data->sink && pa_sink_input_get_state(data->sync_base) == PA_SINK_INPUT_CORKED));
 137
 138     if (!data->sample_spec_is_set)
 139         data->sample_spec = data->sink->sample_spec;
 140
 141     pa_return_null_if_fail(pa_sample_spec_valid(&data->sample_spec));
 142
 143     if (!data->channel_map_is_set) {
 144         if (data->sink->channel_map.channels == data->sample_spec.channels)
 145             data->channel_map = data->sink->channel_map;
 146         else
 147             pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));
 148     }
 149
 150     pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
 151     pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);
 152
 153     if (!data->volume_is_set)
 154         pa_cvolume_reset(&data->volume, data->sample_spec.channels);
 155
 156     pa_return_null_if_fail(pa_cvolume_valid(&data->volume));
 157     pa_return_null_if_fail(data->volume.channels == data->sample_spec.channels);
 158
 159     if (!data->muted_is_set)
 160         data->muted = FALSE;
 161
 162     if (flags & PA_SINK_INPUT_FIX_FORMAT)
 163         data->sample_spec.format = data->sink->sample_spec.format;
 164
 165     if (flags & PA_SINK_INPUT_FIX_RATE)
 166         data->sample_spec.rate = data->sink->sample_spec.rate;
 167
 168     if (flags & PA_SINK_INPUT_FIX_CHANNELS) {
 169         data->sample_spec.channels = data->sink->sample_spec.channels;
 170         data->channel_map = data->sink->channel_map;
 171     }
 172
 173     pa_assert(pa_sample_spec_valid(&data->sample_spec));
 174     pa_assert(pa_channel_map_valid(&data->channel_map));
 175
 176     /* Due to the fixing of the sample spec the volume might not match anymore */
 177     if (data->volume.channels != data->sample_spec.channels)
 178         pa_cvolume_set(&data->volume, data->sample_spec.channels, pa_cvolume_avg(&data->volume));
 179
 180     if (data->resample_method == PA_RESAMPLER_INVALID)
 181         data->resample_method = core->resample_method;
 182
 183     pa_return_null_if_fail(data->resample_method < PA_RESAMPLER_MAX);
 184
 185     if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], data) < 0)
 186         return NULL;
 187
 188     if (pa_idxset_size(data->sink->inputs) >= PA_MAX_INPUTS_PER_SINK) {
 189         pa_log_warn("Failed to create sink input: too many inputs per sink.");
 190         return NULL;
 191     }
 192
 193     if ((flags & PA_SINK_INPUT_VARIABLE_RATE) ||
 194         !pa_sample_spec_equal(&data->sample_spec, &data->sink->sample_spec) ||
 195         !pa_channel_map_equal(&data->channel_map, &data->sink->channel_map)) {
 196
 197         if (!(resampler = pa_resampler_new(
 198                       core->mempool,
 199                       &data->sample_spec, &data->channel_map,
 200                       &data->sink->sample_spec, &data->sink->channel_map,
 201                       data->resample_method,
 202                       ((flags & PA_SINK_INPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 203                       ((flags & PA_SINK_INPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 204                       (core->disable_remixing || (flags & PA_SINK_INPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 205             pa_log_warn("Unsupported resampling operation.");
 206             return NULL;
 207         }
 208
 209         data->resample_method = pa_resampler_get_method(resampler);
 210     }
 211
 212     i = pa_msgobject_new(pa_sink_input);
 213     i->parent.parent.free = sink_input_free;
 214     i->parent.process_msg = pa_sink_input_process_msg;
 215
 216     i->core = core;
 217     i->state = PA_SINK_INPUT_INIT;
 218     i->flags = flags;
 219     i->proplist = pa_proplist_copy(data->proplist);
 220     i->driver = pa_xstrdup(data->driver);
 221     i->module = data->module;
 222     i->sink = data->sink;
 223     i->client = data->client;
 224
 225     i->resample_method = data->resample_method;
 226     i->sample_spec = data->sample_spec;
 227     i->channel_map = data->channel_map;
 228
 229     i->volume = data->volume;
 230     i->muted = data->muted;
 231
 232     if (data->sync_base) {
 233         i->sync_next = data->sync_base->sync_next;
 234         i->sync_prev = data->sync_base;
 235
 236         if (data->sync_base->sync_next)
 237             data->sync_base->sync_next->sync_prev = i;
 238         data->sync_base->sync_next = i;
 239     } else
 240         i->sync_next = i->sync_prev = NULL;
 241
 242     i->direct_outputs = pa_idxset_new(NULL, NULL);
 243
 244     reset_callbacks(i);
 245     i->userdata = NULL;
 246
 247     i->thread_info.state = i->state;
 248     i->thread_info.attached = FALSE;
 249     pa_atomic_store(&i->thread_info.drained, 1);
 250     i->thread_info.sample_spec = i->sample_spec;
 251     i->thread_info.resampler = resampler;
 252     i->thread_info.volume = i->volume;
 253     i->thread_info.muted = i->muted;
 254     i->thread_info.requested_sink_latency = (pa_usec_t) -1;
 255     i->thread_info.rewrite_nbytes = 0;
 256     i->thread_info.rewrite_flush = FALSE;
 257     i->thread_info.underrun_for = (uint64_t) -1;
 258     i->thread_info.playing_for = 0;
 259     i->thread_info.direct_outputs = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 260
 261     i->thread_info.render_memblockq = pa_memblockq_new(
 262             0,
 263             MEMBLOCKQ_MAXLENGTH,
 264             0,
 265             pa_frame_size(&i->sink->sample_spec),
 266             0,
 267             1,
 268             0,
 269             &i->sink->silence);
 270
 271     pa_assert_se(pa_idxset_put(core->sink_inputs, pa_sink_input_ref(i), &i->index) == 0);
 272     pa_assert_se(pa_idxset_put(i->sink->inputs, i, NULL) == 0);
 273
 274     pa_log_info("Created input %u \"%s\" on %s with sample spec %s and channel map %s",
 275                 i->index,
 276                 pa_strnull(pa_proplist_gets(i->proplist, PA_PROP_MEDIA_NAME)),
 277                 i->sink->name,
 278                 pa_sample_spec_snprint(st, sizeof(st), &i->sample_spec),
 279                 pa_channel_map_snprint(cm, sizeof(cm), &i->channel_map));
 280
 281     /* Don't forget to call pa_sink_input_put! */
 282
 283     return i;
 284 }
 285
 286 /* Called from main context */
 287 static void update_n_corked(pa_sink_input *i, pa_sink_input_state_t state) {
 288     pa_assert(i);
 289
 290     if (i->state == PA_SINK_INPUT_CORKED && state != PA_SINK_INPUT_CORKED)
 291         pa_assert_se(i->sink->n_corked -- >= 1);
 292     else if (i->state != PA_SINK_INPUT_CORKED && state == PA_SINK_INPUT_CORKED)
 293         i->sink->n_corked++;
 294
 295     pa_sink_update_status(i->sink);
 296 }
 297
 298 /* Called from main context */
 299 static int sink_input_set_state(pa_sink_input *i, pa_sink_input_state_t state) {
 300     pa_sink_input *ssync;
 301     pa_assert(i);
 302
 303     if (state == PA_SINK_INPUT_DRAINED)
 304         state = PA_SINK_INPUT_RUNNING;
 305
 306     if (i->state == state)
 307         return 0;
 308
 309     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) == 0);
 310
 311     update_n_corked(i, state);
 312     i->state = state;
 313
 314     for (ssync = i->sync_prev; ssync; ssync = ssync->sync_prev) {
 315         update_n_corked(ssync, state);
 316         ssync->state = state;
 317     }
 318     for (ssync = i->sync_next; ssync; ssync = ssync->sync_next) {
 319         update_n_corked(ssync, state);
 320         ssync->state = state;
 321     }
 322
 323     if (state != PA_SINK_INPUT_UNLINKED) {
 324         pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_STATE_CHANGED], i);
 325
 326         for (ssync = i->sync_prev; ssync; ssync = ssync->sync_prev)
 327             pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_STATE_CHANGED], ssync);
 328
 329         for (ssync = i->sync_next; ssync; ssync = ssync->sync_next)
 330             pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_STATE_CHANGED], ssync);
 331     }
 332
 333     return 0;
 334 }
 335
 336 /* Called from main context */
 337 void pa_sink_input_unlink(pa_sink_input *i) {
 338     pa_bool_t linked;
 339     pa_source_output *o, *p =  NULL;
 340     pa_assert(i);
 341
 342     /* See pa_sink_unlink() for a couple of comments how this function
 343      * works */
 344
 345     pa_sink_input_ref(i);
 346
 347     linked = PA_SINK_INPUT_IS_LINKED(i->state);
 348
 349     if (linked)
 350         pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK], i);
 351
 352     if (i->sync_prev)
 353         i->sync_prev->sync_next = i->sync_next;
 354     if (i->sync_next)
 355         i->sync_next->sync_prev = i->sync_prev;
 356
 357     i->sync_prev = i->sync_next = NULL;
 358
 359     pa_idxset_remove_by_data(i->sink->core->sink_inputs, i, NULL);
 360     if (pa_idxset_remove_by_data(i->sink->inputs, i, NULL))
 361         pa_sink_input_unref(i);
 362
 363     while ((o = pa_idxset_first(i->direct_outputs, NULL))) {
 364         pa_assert(o != p);
 365         pa_source_output_kill(o);
 366         p = o;
 367     }
 368
 369     update_n_corked(i, PA_SINK_INPUT_UNLINKED);
 370     i->state = PA_SINK_INPUT_UNLINKED;
 371
 372     if (linked)
 373         if (i->sink->asyncmsgq)
 374             pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_REMOVE_INPUT, i, 0, NULL) == 0);
 375
 376     reset_callbacks(i);
 377
 378     if (linked) {
 379         pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_REMOVE, i->index);
 380         pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK_POST], i);
 381     }
 382
 383     i->sink = NULL;
 384     pa_sink_input_unref(i);
 385 }
 386
 387 /* Called from main context */
 388 static void sink_input_free(pa_object *o) {
 389     pa_sink_input* i = PA_SINK_INPUT(o);
 390
 391     pa_assert(i);
 392     pa_assert(pa_sink_input_refcnt(i) == 0);
 393
 394     if (PA_SINK_INPUT_IS_LINKED(i->state))
 395         pa_sink_input_unlink(i);
 396
 397     pa_log_info("Freeing input %u \"%s\"", i->index, pa_strnull(pa_proplist_gets(i->proplist, PA_PROP_MEDIA_NAME)));
 398
 399     pa_assert(!i->thread_info.attached);
 400
 401     if (i->thread_info.render_memblockq)
 402         pa_memblockq_free(i->thread_info.render_memblockq);
 403
 404     if (i->thread_info.resampler)
 405         pa_resampler_free(i->thread_info.resampler);
 406
 407     if (i->proplist)
 408         pa_proplist_free(i->proplist);
 409
 410     if (i->direct_outputs)
 411         pa_idxset_free(i->direct_outputs, NULL, NULL);
 412
 413     if (i->thread_info.direct_outputs)
 414         pa_hashmap_free(i->thread_info.direct_outputs, NULL, NULL);
 415
 416     pa_xfree(i->driver);
 417     pa_xfree(i);
 418 }
 419
 420 /* Called from main context */
 421 void pa_sink_input_put(pa_sink_input *i) {
 422     pa_sink_input_state_t state;
 423     pa_sink_input_assert_ref(i);
 424
 425     pa_assert(i->state == PA_SINK_INPUT_INIT);
 426
 427     /* The following fields must be initialized properly */
 428     pa_assert(i->pop);
 429     pa_assert(i->process_rewind);
 430     pa_assert(i->kill);
 431
 432     i->thread_info.volume = i->volume;
 433     i->thread_info.muted = i->muted;
 434
 435     state = i->flags & PA_SINK_INPUT_START_CORKED ? PA_SINK_INPUT_CORKED : PA_SINK_INPUT_RUNNING;
 436
 437     update_n_corked(i, state);
 438     i->state = state;
 439
 440     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_ADD_INPUT, i, 0, NULL) == 0);
 441
 442     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW, i->index);
 443     pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_PUT], i);
 444 }
 445
 446 /* Called from main context */
 447 void pa_sink_input_kill(pa_sink_input*i) {
 448     pa_sink_input_assert_ref(i);
 449     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 450
 451     i->kill(i);
 452 }
 453
 454 /* Called from main context */
 455 pa_usec_t pa_sink_input_get_latency(pa_sink_input *i, pa_usec_t *sink_latency) {
 456     pa_usec_t r[2] = { 0, 0 };
 457
 458     pa_sink_input_assert_ref(i);
 459     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 460
 461     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_GET_LATENCY, r, 0, NULL) == 0);
 462
 463     if (i->get_latency)
 464         r[0] += i->get_latency(i);
 465
 466     if (sink_latency)
 467         *sink_latency = r[1];
 468
 469     return r[0];
 470 }
 471
 472 /* Called from thread context */
 473 int pa_sink_input_peek(pa_sink_input *i, size_t slength /* in sink frames */, pa_memchunk *chunk, pa_cvolume *volume) {
 474     pa_bool_t do_volume_adj_here;
 475     pa_bool_t volume_is_norm;
 476     size_t block_size_max_sink, block_size_max_sink_input;
 477     size_t ilength;
 478
 479     pa_sink_input_assert_ref(i);
 480     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 481     pa_assert(pa_frame_aligned(slength, &i->sink->sample_spec));
 482     pa_assert(chunk);
 483     pa_assert(volume);
 484
 485 /*     pa_log_debug("peek"); */
 486
 487     if (!i->pop)
 488         return -1;
 489
 490     pa_assert(i->thread_info.state == PA_SINK_INPUT_RUNNING ||
 491               i->thread_info.state == PA_SINK_INPUT_CORKED ||
 492               i->thread_info.state == PA_SINK_INPUT_DRAINED);
 493
 494     /* If there's still some rewrite request the handle, but the sink
 495     didn't do this for us, we do it here. However, since the sink
 496     apparently doesn't support rewinding, we pass 0 here. This still
 497     allows rewinding through the render buffer. */
 498     pa_sink_input_process_rewind(i, 0);
 499
 500     block_size_max_sink_input = i->thread_info.resampler ?
 501         pa_resampler_max_block_size(i->thread_info.resampler) :
 502         pa_frame_align(pa_mempool_block_size_max(i->sink->core->mempool), &i->sample_spec);
 503
 504     block_size_max_sink = pa_frame_align(pa_mempool_block_size_max(i->sink->core->mempool), &i->sink->sample_spec);
 505
 506     /* Default buffer size */
 507     if (slength <= 0)
 508         slength = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sink->sample_spec);
 509
 510     if (slength > block_size_max_sink)
 511         slength = block_size_max_sink;
 512
 513     if (i->thread_info.resampler) {
 514         ilength = pa_resampler_request(i->thread_info.resampler, slength);
 515
 516         if (ilength <= 0)
 517             ilength = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sample_spec);
 518     } else
 519         ilength = slength;
 520
 521     if (ilength > block_size_max_sink_input)
 522         ilength = block_size_max_sink_input;
 523
 524     /* If the channel maps of the sink and this stream differ, we need
 525      * to adjust the volume *before* we resample. Otherwise we can do
 526      * it after and leave it for the sink code */
 527
 528     do_volume_adj_here = !pa_channel_map_equal(&i->channel_map, &i->sink->channel_map);
 529     volume_is_norm = pa_cvolume_is_norm(&i->thread_info.volume) && !i->thread_info.muted;
 530
 531     while (!pa_memblockq_is_readable(i->thread_info.render_memblockq)) {
 532         pa_memchunk tchunk;
 533
 534         /* There's nothing in our render queue. We need to fill it up
 535          * with data from the implementor. */
 536
 537         if (i->thread_info.state == PA_SINK_INPUT_CORKED ||
 538             i->pop(i, ilength, &tchunk) < 0) {
 539
 540             /* OK, we're corked or the implementor didn't give us any
 541              * data, so let's just hand out silence */
 542             pa_atomic_store(&i->thread_info.drained, 1);
 543
 544             pa_memblockq_seek(i->thread_info.render_memblockq, slength, PA_SEEK_RELATIVE);
 545             i->thread_info.playing_for = 0;
 546             if (i->thread_info.underrun_for != (uint64_t) -1)
 547                 i->thread_info.underrun_for += ilength;
 548             break;
 549         }
 550
 551         pa_atomic_store(&i->thread_info.drained, 0);
 552
 553         pa_assert(tchunk.length > 0);
 554         pa_assert(tchunk.memblock);
 555
 556         i->thread_info.underrun_for = 0;
 557         i->thread_info.playing_for += tchunk.length;
 558
 559         while (tchunk.length > 0) {
 560             pa_memchunk wchunk;
 561
 562             wchunk = tchunk;
 563             pa_memblock_ref(wchunk.memblock);
 564
 565             if (wchunk.length > block_size_max_sink_input)
 566                 wchunk.length = block_size_max_sink_input;
 567
 568             /* It might be necessary to adjust the volume here */
 569             if (do_volume_adj_here && !volume_is_norm) {
 570                 pa_memchunk_make_writable(&wchunk, 0);
 571
 572                 if (i->thread_info.muted)
 573                     pa_silence_memchunk(&wchunk, &i->thread_info.sample_spec);
 574                 else
 575                     pa_volume_memchunk(&wchunk, &i->thread_info.sample_spec, &i->thread_info.volume);
 576             }
 577
 578             if (!i->thread_info.resampler)
 579                 pa_memblockq_push_align(i->thread_info.render_memblockq, &wchunk);
 580             else {
 581                 pa_memchunk rchunk;
 582                 pa_resampler_run(i->thread_info.resampler, &wchunk, &rchunk);
 583
 584 /*                 pa_log_debug("pushing %lu", (unsigned long) rchunk.length); */
 585
 586                 if (rchunk.memblock) {
 587                     pa_memblockq_push_align(i->thread_info.render_memblockq, &rchunk);
 588                     pa_memblock_unref(rchunk.memblock);
 589                 }
 590             }
 591
 592             pa_memblock_unref(wchunk.memblock);
 593
 594             tchunk.index += wchunk.length;
 595             tchunk.length -= wchunk.length;
 596         }
 597
 598         pa_memblock_unref(tchunk.memblock);
 599     }
 600
 601     pa_assert_se(pa_memblockq_peek(i->thread_info.render_memblockq, chunk) >= 0);
 602
 603     pa_assert(chunk->length > 0);
 604     pa_assert(chunk->memblock);
 605
 606 /*     pa_log_debug("peeking %lu", (unsigned long) chunk->length); */
 607
 608     if (chunk->length > block_size_max_sink)
 609         chunk->length = block_size_max_sink;
 610
 611     /* Let's see if we had to apply the volume adjustment ourselves,
 612      * or if this can be done by the sink for us */
 613
 614     if (do_volume_adj_here)
 615         /* We had different channel maps, so we already did the adjustment */
 616         pa_cvolume_reset(volume, i->sink->sample_spec.channels);
 617     else if (i->thread_info.muted)
 618         /* We've both the same channel map, so let's have the sink do the adjustment for us*/
 619         pa_cvolume_mute(volume, i->sink->sample_spec.channels);
 620     else
 621         *volume = i->thread_info.volume;
 622
 623     return 0;
 624 }
 625
 626 /* Called from thread context */
 627 void pa_sink_input_drop(pa_sink_input *i, size_t nbytes /* in sink sample spec */) {
 628     pa_sink_input_assert_ref(i);
 629
 630     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 631     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 632     pa_assert(nbytes > 0);
 633
 634 /*     pa_log_debug("dropping %lu", (unsigned long) nbytes); */
 635
 636     /* If there's still some rewrite request the handle, but the sink
 637     didn't do this for us, we do it here. However, since the sink
 638     apparently doesn't support rewinding, we pass 0 here. This still
 639     allows rewinding through the render buffer. */
 640     pa_sink_input_process_rewind(i, 0);
 641
 642     pa_memblockq_drop(i->thread_info.render_memblockq, nbytes);
 643 }
 644
 645 /* Called from thread context */
 646 void pa_sink_input_process_rewind(pa_sink_input *i, size_t nbytes /* in sink sample spec */) {
 647     size_t lbq;
 648     pa_sink_input_assert_ref(i);
 649
 650     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 651     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 652
 653 /*     pa_log_debug("rewind(%lu, %lu)", (unsigned long) nbytes, (unsigned long) i->thread_info.rewrite_nbytes); */
 654
 655     lbq = pa_memblockq_get_length(i->thread_info.render_memblockq);
 656
 657     if (nbytes > 0) {
 658         pa_log_debug("Have to rewind %lu bytes on render memblockq.", (unsigned long) nbytes);
 659         pa_memblockq_rewind(i->thread_info.render_memblockq, nbytes);
 660     }
 661
 662     if (i->thread_info.rewrite_nbytes == (size_t) -1) {
 663
 664         /* We were asked to drop all buffered data, and rerequest new
 665          * data from implementor the next time push() is called */
 666
 667         pa_memblockq_flush(i->thread_info.render_memblockq);
 668
 669     } else if (i->thread_info.rewrite_nbytes > 0) {
 670         size_t max_rewrite, amount;
 671
 672         /* Calculate how much make sense to rewrite at most */
 673         max_rewrite = nbytes + lbq;
 674
 675         /* Transform into local domain */
 676         if (i->thread_info.resampler)
 677             max_rewrite = pa_resampler_request(i->thread_info.resampler, max_rewrite);
 678
 679         /* Calculate how much of the rewinded data should actually be rewritten */
 680         amount = PA_MIN(i->thread_info.rewrite_nbytes, max_rewrite);
 681
 682         if (amount > 0) {
 683             pa_log_debug("Have to rewind %lu bytes on implementor.", (unsigned long) amount);
 684
 685             /* Tell the implementor */
 686             if (i->process_rewind)
 687                 i->process_rewind(i, amount);
 688
 689             /* Convert back to to sink domain */
 690             if (i->thread_info.resampler)
 691                 amount = pa_resampler_result(i->thread_info.resampler, amount);
 692
 693             if (amount > 0)
 694                 /* Ok, now update the write pointer */
 695                 pa_memblockq_seek(i->thread_info.render_memblockq, - ((int64_t) amount), PA_SEEK_RELATIVE);
 696
 697             if (i->thread_info.rewrite_flush)
 698                 pa_memblockq_silence(i->thread_info.render_memblockq);
 699
 700             /* And reset the resampler */
 701             if (i->thread_info.resampler)
 702                 pa_resampler_reset(i->thread_info.resampler);
 703         }
 704     }
 705
 706     i->thread_info.rewrite_nbytes = 0;
 707     i->thread_info.rewrite_flush = FALSE;
 708 }
 709
 710 /* Called from thread context */
 711 void pa_sink_input_update_max_rewind(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */) {
 712     pa_sink_input_assert_ref(i);
 713     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 714     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 715
 716     pa_memblockq_set_maxrewind(i->thread_info.render_memblockq, nbytes);
 717
 718     if (i->update_max_rewind)
 719         i->update_max_rewind(i, i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, nbytes) : nbytes);
 720 }
 721
 722 /* Called from thread context */
 723 void pa_sink_input_update_max_request(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */) {
 724     pa_sink_input_assert_ref(i);
 725     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 726     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 727
 728     if (i->update_max_request)
 729         i->update_max_request(i, i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, nbytes) : nbytes);
 730 }
 731
 732 /* Called from thread context */
 733 static pa_usec_t fixup_latency(pa_sink *s, pa_usec_t usec) {
 734     pa_sink_assert_ref(s);
 735
 736     if (usec == (pa_usec_t) -1)
 737         return usec;
 738
 739     if (s->thread_info.max_latency > 0 && usec > s->thread_info.max_latency)
 740         usec = s->thread_info.max_latency;
 741
 742     if (s->thread_info.min_latency > 0 && usec < s->thread_info.min_latency)
 743         usec = s->thread_info.min_latency;
 744
 745     return usec;
 746 }
 747
 748 /* Called from thread context */
 749 pa_usec_t pa_sink_input_set_requested_latency_within_thread(pa_sink_input *i, pa_usec_t usec) {
 750     pa_sink_input_assert_ref(i);
 751
 752     usec = fixup_latency(i->sink, usec);
 753     i->thread_info.requested_sink_latency = usec;
 754     pa_sink_invalidate_requested_latency(i->sink);
 755
 756     return usec;
 757 }
 758
 759 /* Called from main context */
 760 pa_usec_t pa_sink_input_set_requested_latency(pa_sink_input *i, pa_usec_t usec) {
 761     pa_sink_input_assert_ref(i);
 762
 763     if (PA_SINK_INPUT_IS_LINKED(i->state))
 764         pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY, &usec, 0, NULL) == 0);
 765     else {
 766         /* If this sink input is not realized yet, we have to touch
 767          * the thread info data directly */
 768
 769         usec = fixup_latency(i->sink, usec);
 770         i->thread_info.requested_sink_latency = usec;
 771         i->sink->thread_info.requested_latency_valid = FALSE;
 772     }
 773
 774     return usec;
 775 }
 776
 777 /* Called from main context */
 778 pa_usec_t pa_sink_input_get_requested_latency(pa_sink_input *i) {
 779     pa_usec_t usec = 0;
 780
 781     pa_sink_input_assert_ref(i);
 782
 783     if (PA_SINK_INPUT_IS_LINKED(i->state))
 784         pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL) == 0);
 785     else
 786         /* If this sink input is not realized yet, we have to touch
 787          * the thread info data directly */
 788         usec = i->thread_info.requested_sink_latency;
 789
 790     return usec;
 791 }
 792
 793 /* Called from main context */
 794 void pa_sink_input_set_volume(pa_sink_input *i, const pa_cvolume *volume) {
 795     pa_sink_input_assert_ref(i);
 796     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 797     pa_assert(volume);
 798
 799     if (pa_cvolume_equal(&i->volume, volume))
 800         return;
 801
 802     i->volume = *volume;
 803
 804     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_VOLUME, &i->volume, 0, NULL) == 0);
 805     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 806 }
 807
 808 /* Called from main context */
 809 const pa_cvolume *pa_sink_input_get_volume(pa_sink_input *i) {
 810     pa_sink_input_assert_ref(i);
 811     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 812
 813     return &i->volume;
 814 }
 815
 816 /* Called from main context */
 817 void pa_sink_input_set_mute(pa_sink_input *i, pa_bool_t mute) {
 818     pa_assert(i);
 819     pa_sink_input_assert_ref(i);
 820     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 821
 822     if (!i->muted == !mute)
 823         return;
 824
 825     i->muted = mute;
 826
 827     pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
 828     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 829 }
 830
 831 /* Called from main context */
 832 pa_bool_t pa_sink_input_get_mute(pa_sink_input *i) {
 833     pa_sink_input_assert_ref(i);
 834     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 835
 836     return i->muted;
 837 }
 838
 839 /* Called from main context */
 840 void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b) {
 841     pa_sink_input_assert_ref(i);
 842     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 843
 844     sink_input_set_state(i, b ? PA_SINK_INPUT_CORKED : PA_SINK_INPUT_RUNNING);
 845 }
 846
 847 /* Called from main context */
 848 int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate) {
 849     pa_sink_input_assert_ref(i);
 850     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 851     pa_return_val_if_fail(i->thread_info.resampler, -1);
 852
 853     if (i->sample_spec.rate == rate)
 854         return 0;
 855
 856     i->sample_spec.rate = rate;
 857
 858     pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
 859
 860     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 861     return 0;
 862 }
 863
 864 /* Called from main context */
 865 void pa_sink_input_set_name(pa_sink_input *i, const char *name) {
 866     const char *old;
 867     pa_sink_input_assert_ref(i);
 868
 869     if (!name && !pa_proplist_contains(i->proplist, PA_PROP_MEDIA_NAME))
 870         return;
 871
 872     old = pa_proplist_gets(i->proplist, PA_PROP_MEDIA_NAME);
 873
 874     if (old && name && !strcmp(old, name))
 875         return;
 876
 877     if (name)
 878         pa_proplist_sets(i->proplist, PA_PROP_MEDIA_NAME, name);
 879     else
 880         pa_proplist_unset(i->proplist, PA_PROP_MEDIA_NAME);
 881
 882     if (PA_SINK_INPUT_IS_LINKED(i->state)) {
 883         pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_PROPLIST_CHANGED], i);
 884         pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 885     }
 886 }
 887
 888 /* Called from main context */
 889 pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i) {
 890     pa_sink_input_assert_ref(i);
 891
 892     return i->resample_method;
 893 }
 894
 895 /* Called from main context */
 896 int pa_sink_input_move_to(pa_sink_input *i, pa_sink *dest) {
 897     pa_resampler *new_resampler;
 898     pa_sink *origin;
 899     pa_sink_input_move_hook_data hook_data;
 900     pa_source_output *o, *p = NULL;
 901
 902     pa_sink_input_assert_ref(i);
 903     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 904     pa_sink_assert_ref(dest);
 905
 906     origin = i->sink;
 907
 908     if (dest == origin)
 909         return 0;
 910
 911     if (i->flags & PA_SINK_INPUT_DONT_MOVE)
 912         return -1;
 913
 914     if (i->sync_next || i->sync_prev) {
 915         pa_log_warn("Moving synchronised streams not supported.");
 916         return -1;
 917     }
 918
 919     if (pa_idxset_size(dest->inputs) >= PA_MAX_INPUTS_PER_SINK) {
 920         pa_log_warn("Failed to move sink input: too many inputs per sink.");
 921         return -1;
 922     }
 923
 924     /* Kill directly connected outputs */
 925     while ((o = pa_idxset_first(i->direct_outputs, NULL))) {
 926         pa_assert(o != p);
 927         pa_source_output_kill(o);
 928         p = o;
 929     }
 930
 931     if (i->thread_info.resampler &&
 932         pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
 933         pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
 934
 935         /* Try to reuse the old resampler if possible */
 936         new_resampler = i->thread_info.resampler;
 937
 938     else if ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ||
 939              !pa_sample_spec_equal(&i->sample_spec, &dest->sample_spec) ||
 940              !pa_channel_map_equal(&i->channel_map, &dest->channel_map)) {
 941
 942         /* Okey, we need a new resampler for the new sink */
 943
 944         if (!(new_resampler = pa_resampler_new(
 945                       dest->core->mempool,
 946                       &i->sample_spec, &i->channel_map,
 947                       &dest->sample_spec, &dest->channel_map,
 948                       i->resample_method,
 949                       ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 950                       ((i->flags & PA_SINK_INPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 951                       (i->core->disable_remixing || (i->flags & PA_SINK_INPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 952             pa_log_warn("Unsupported resampling operation.");
 953             return -1;
 954         }
 955     } else
 956         new_resampler = NULL;
 957
 958     hook_data.sink_input = i;
 959     hook_data.destination = dest;
 960     pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE], &hook_data);
 961
 962     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_START_MOVE, i, 0, NULL) == 0);
 963
 964     pa_idxset_remove_by_data(origin->inputs, i, NULL);
 965     pa_idxset_put(dest->inputs, i, NULL);
 966     i->sink = dest;
 967
 968     if (pa_sink_input_get_state(i) == PA_SINK_INPUT_CORKED) {
 969         pa_assert_se(origin->n_corked-- >= 1);
 970         dest->n_corked++;
 971     }
 972
 973     /* Replace resampler and render queue */
 974     if (new_resampler != i->thread_info.resampler) {
 975
 976         if (i->thread_info.resampler)
 977             pa_resampler_free(i->thread_info.resampler);
 978         i->thread_info.resampler = new_resampler;
 979
 980         pa_memblockq_free(i->thread_info.render_memblockq);
 981
 982         i->thread_info.render_memblockq = pa_memblockq_new(
 983                 0,
 984                 MEMBLOCKQ_MAXLENGTH,
 985                 0,
 986                 pa_frame_size(&i->sink->sample_spec),
 987                 0,
 988                 1,
 989                 0,
 990                 &i->sink->silence);
 991     }
 992
 993     pa_sink_update_status(origin);
 994     pa_sink_update_status(dest);
 995
 996     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_FINISH_MOVE, i, 0, NULL) == 0);
 997
 998     if (i->moved)
 999         i->moved(i);
1000
1001     pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_POST], i);
1002
1003     pa_log_debug("Successfully moved sink input %i from %s to %s.", i->index, origin->name, dest->name);
1004
1005     /* Notify everyone */
1006     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
1007
1008     return 0;
1009 }
1010
1011 /* Called from IO thread context */
1012 void pa_sink_input_set_state_within_thread(pa_sink_input *i, pa_sink_input_state_t state) {
1013     pa_sink_input_assert_ref(i);
1014
1015     if (state == i->thread_info.state)
1016         return;
1017
1018     if ((state == PA_SINK_INPUT_DRAINED || state == PA_SINK_INPUT_RUNNING) &&
1019         !(i->thread_info.state == PA_SINK_INPUT_DRAINED || i->thread_info.state != PA_SINK_INPUT_RUNNING))
1020         pa_atomic_store(&i->thread_info.drained, 1);
1021
1022     if (state == PA_SINK_INPUT_CORKED && i->thread_info.state != PA_SINK_INPUT_CORKED) {
1023
1024         /* This will tell the implementing sink input driver to rewind
1025          * so that the unplayed already mixed data is not lost */
1026         pa_sink_input_request_rewind(i, 0, TRUE, TRUE);
1027
1028     } else if (i->thread_info.state == PA_SINK_INPUT_CORKED && state != PA_SINK_INPUT_CORKED) {
1029
1030         /* OK, we're being uncorked. Make sure we're not rewound when
1031          * the hw buffer is remixed and request a remix. */
1032         pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
1033     }
1034
1035     if (i->state_change)
1036         i->state_change(i, state);
1037
1038     i->thread_info.state = state;
1039 }
1040
1041 /* Called from thread context, except when it is not. */
1042 int pa_sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
1043     pa_sink_input *i = PA_SINK_INPUT(o);
1044     pa_sink_input_assert_ref(i);
1045
1046     switch (code) {
1047
1048         case PA_SINK_INPUT_MESSAGE_SET_VOLUME:
1049             i->thread_info.volume = *((pa_cvolume*) userdata);
1050             pa_sink_input_request_rewind(i, 0, TRUE, FALSE);
1051             return 0;
1052
1053         case PA_SINK_INPUT_MESSAGE_SET_MUTE:
1054             i->thread_info.muted = PA_PTR_TO_UINT(userdata);
1055             pa_sink_input_request_rewind(i, 0, TRUE, FALSE);
1056             return 0;
1057
1058         case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
1059             pa_usec_t *r = userdata;
1060             pa_usec_t sink_usec = 0;
1061
1062             r[0] += pa_bytes_to_usec(pa_memblockq_get_length(i->thread_info.render_memblockq), &i->sink->sample_spec);
1063
1064             if (i->sink->parent.process_msg(PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_GET_LATENCY, &sink_usec, 0, NULL) >= 0)
1065                 r[1] += sink_usec;
1066
1067             return 0;
1068         }
1069
1070         case PA_SINK_INPUT_MESSAGE_SET_RATE:
1071
1072             i->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
1073             pa_resampler_set_input_rate(i->thread_info.resampler, PA_PTR_TO_UINT(userdata));
1074
1075             return 0;
1076
1077         case PA_SINK_INPUT_MESSAGE_SET_STATE: {
1078             pa_sink_input *ssync;
1079
1080             pa_sink_input_set_state_within_thread(i, PA_PTR_TO_UINT(userdata));
1081
1082             for (ssync = i->thread_info.sync_prev; ssync; ssync = ssync->thread_info.sync_prev)
1083                 pa_sink_input_set_state_within_thread(ssync, PA_PTR_TO_UINT(userdata));
1084
1085             for (ssync = i->thread_info.sync_next; ssync; ssync = ssync->thread_info.sync_next)
1086                 pa_sink_input_set_state_within_thread(ssync, PA_PTR_TO_UINT(userdata));
1087
1088             return 0;
1089         }
1090
1091         case PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY: {
1092             pa_usec_t *usec = userdata;
1093
1094             *usec = pa_sink_input_set_requested_latency_within_thread(i, *usec);
1095             return 0;
1096         }
1097
1098         case PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY: {
1099             pa_usec_t *r = userdata;
1100
1101             *r = i->thread_info.requested_sink_latency;
1102             return 0;
1103         }
1104     }
1105
1106     return -1;
1107 }
1108
1109 /* Called from main thread */
1110 pa_sink_input_state_t pa_sink_input_get_state(pa_sink_input *i) {
1111     pa_sink_input_assert_ref(i);
1112
1113     if (i->state == PA_SINK_INPUT_RUNNING || i->state == PA_SINK_INPUT_DRAINED)
1114         return pa_atomic_load(&i->thread_info.drained) ? PA_SINK_INPUT_DRAINED : PA_SINK_INPUT_RUNNING;
1115
1116     return i->state;
1117 }
1118
1119 /* Called from IO context */
1120 pa_bool_t pa_sink_input_safe_to_remove(pa_sink_input *i) {
1121     pa_sink_input_assert_ref(i);
1122
1123     if (PA_SINK_INPUT_IS_LINKED(i->thread_info.state))
1124         return pa_memblockq_is_empty(i->thread_info.render_memblockq);
1125
1126     return TRUE;
1127 }
1128
1129 /* Called from IO context */
1130 void pa_sink_input_request_rewind(pa_sink_input *i, size_t nbytes  /* in our sample spec */, pa_bool_t rewrite, pa_bool_t flush) {
1131     size_t lbq;
1132
1133     /* If 'rewrite' is TRUE the sink is rewound as far as requested
1134      * and possible and the exact value of this is passed back the
1135      * implementor via process_rewind(). If 'flush' is also TRUE all
1136      * already rendered data is also dropped.
1137      *
1138      * If 'rewrite' is FALSE the sink is rewound as far as requested
1139      * and possible and the already rendered data is dropped so that
1140      * in the next iteration we read new data from the
1141      * implementor. This implies 'flush' is TRUE. */
1142
1143     pa_sink_input_assert_ref(i);
1144     pa_assert(i->thread_info.rewrite_nbytes == 0);
1145
1146     /* We don't take rewind requests while we are corked */
1147     if (i->thread_info.state == PA_SINK_INPUT_CORKED)
1148         return;
1149
1150     pa_assert(rewrite || flush);
1151
1152     /* Calculate how much we can rewind locally without having to
1153      * touch the sink */
1154     if (rewrite)
1155         lbq = pa_memblockq_get_length(i->thread_info.render_memblockq);
1156     else
1157         lbq = 0;
1158
1159     /* Check if rewinding for the maximum is requested, and if so, fix up */
1160     if (nbytes <= 0) {
1161
1162         /* Calculate maximum number of bytes that could be rewound in theory */
1163         nbytes = i->sink->thread_info.max_rewind + lbq;
1164
1165         /* Transform from sink domain */
1166         if (i->thread_info.resampler)
1167             nbytes = pa_resampler_request(i->thread_info.resampler, nbytes);
1168     }
1169
1170     if (rewrite) {
1171         /* Make sure to not overwrite over underruns */
1172         if (nbytes > i->thread_info.playing_for)
1173             nbytes = (size_t) i->thread_info.playing_for;
1174
1175         i->thread_info.rewrite_nbytes = nbytes;
1176     } else
1177         i->thread_info.rewrite_nbytes = (size_t) -1;
1178
1179     i->thread_info.rewrite_flush = flush && i->thread_info.rewrite_nbytes != 0;
1180
1181     /* Transform to sink domain */
1182     if (i->thread_info.resampler)
1183         nbytes = pa_resampler_result(i->thread_info.resampler, nbytes);
1184
1185     if (nbytes > lbq)
1186         pa_sink_request_rewind(i->sink, nbytes - lbq);
1187 }
1188
1189 /* Called from main context */
1190 pa_memchunk* pa_sink_input_get_silence(pa_sink_input *i, pa_memchunk *ret) {
1191     pa_sink_input_assert_ref(i);
1192     pa_assert(ret);
1193
1194     pa_silence_memchunk_get(
1195                 &i->sink->core->silence_cache,
1196                 i->sink->core->mempool,
1197                 ret,
1198                 &i->sample_spec,
1199                 i->thread_info.resampler ? pa_resampler_max_block_size(i->thread_info.resampler) : 0);
1200
1201     return ret;
1202 }