code.delx.au - pulseaudio/blob - 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     block_size_max_sink_input = i->thread_info.resampler ?
 495         pa_resampler_max_block_size(i->thread_info.resampler) :
 496         pa_frame_align(pa_mempool_block_size_max(i->sink->core->mempool), &i->sample_spec);
 497
 498     block_size_max_sink = pa_frame_align(pa_mempool_block_size_max(i->sink->core->mempool), &i->sink->sample_spec);
 499
 500     /* Default buffer size */
 501     if (slength <= 0)
 502         slength = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sink->sample_spec);
 503
 504     if (slength > block_size_max_sink)
 505         slength = block_size_max_sink;
 506
 507     if (i->thread_info.resampler) {
 508         ilength = pa_resampler_request(i->thread_info.resampler, slength);
 509
 510         if (ilength <= 0)
 511             ilength = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sample_spec);
 512     } else
 513         ilength = slength;
 514
 515     if (ilength > block_size_max_sink_input)
 516         ilength = block_size_max_sink_input;
 517
 518     /* If the channel maps of the sink and this stream differ, we need
 519      * to adjust the volume *before* we resample. Otherwise we can do
 520      * it after and leave it for the sink code */
 521
 522     do_volume_adj_here = !pa_channel_map_equal(&i->channel_map, &i->sink->channel_map);
 523     volume_is_norm = pa_cvolume_is_norm(&i->thread_info.volume) && !i->thread_info.muted;
 524
 525     while (!pa_memblockq_is_readable(i->thread_info.render_memblockq)) {
 526         pa_memchunk tchunk;
 527
 528         /* There's nothing in our render queue. We need to fill it up
 529          * with data from the implementor. */
 530
 531         if (i->thread_info.state == PA_SINK_INPUT_CORKED ||
 532             i->pop(i, ilength, &tchunk) < 0) {
 533
 534             /* OK, we're corked or the implementor didn't give us any
 535              * data, so let's just hand out silence */
 536             pa_atomic_store(&i->thread_info.drained, 1);
 537
 538             pa_memblockq_seek(i->thread_info.render_memblockq, slength, PA_SEEK_RELATIVE);
 539             i->thread_info.playing_for = 0;
 540             if (i->thread_info.underrun_for != (uint64_t) -1)
 541                 i->thread_info.underrun_for += ilength;
 542             break;
 543         }
 544
 545         pa_atomic_store(&i->thread_info.drained, 0);
 546
 547         pa_assert(tchunk.length > 0);
 548         pa_assert(tchunk.memblock);
 549
 550         i->thread_info.underrun_for = 0;
 551         i->thread_info.playing_for += tchunk.length;
 552
 553         while (tchunk.length > 0) {
 554             pa_memchunk wchunk;
 555
 556             wchunk = tchunk;
 557             pa_memblock_ref(wchunk.memblock);
 558
 559             if (wchunk.length > block_size_max_sink_input)
 560                 wchunk.length = block_size_max_sink_input;
 561
 562             /* It might be necessary to adjust the volume here */
 563             if (do_volume_adj_here && !volume_is_norm) {
 564                 pa_memchunk_make_writable(&wchunk, 0);
 565
 566                 if (i->thread_info.muted)
 567                     pa_silence_memchunk(&wchunk, &i->thread_info.sample_spec);
 568                 else
 569                     pa_volume_memchunk(&wchunk, &i->thread_info.sample_spec, &i->thread_info.volume);
 570             }
 571
 572             if (!i->thread_info.resampler)
 573                 pa_memblockq_push_align(i->thread_info.render_memblockq, &wchunk);
 574             else {
 575                 pa_memchunk rchunk;
 576                 pa_resampler_run(i->thread_info.resampler, &wchunk, &rchunk);
 577
 578 /*                 pa_log_debug("pushing %lu", (unsigned long) rchunk.length); */
 579
 580                 if (rchunk.memblock) {
 581                     pa_memblockq_push_align(i->thread_info.render_memblockq, &rchunk);
 582                     pa_memblock_unref(rchunk.memblock);
 583                 }
 584             }
 585
 586             pa_memblock_unref(wchunk.memblock);
 587
 588             tchunk.index += wchunk.length;
 589             tchunk.length -= wchunk.length;
 590         }
 591
 592         pa_memblock_unref(tchunk.memblock);
 593     }
 594
 595     pa_assert_se(pa_memblockq_peek(i->thread_info.render_memblockq, chunk) >= 0);
 596
 597     pa_assert(chunk->length > 0);
 598     pa_assert(chunk->memblock);
 599
 600 /*     pa_log_debug("peeking %lu", (unsigned long) chunk->length); */
 601
 602     if (chunk->length > block_size_max_sink)
 603         chunk->length = block_size_max_sink;
 604
 605     /* Let's see if we had to apply the volume adjustment ourselves,
 606      * or if this can be done by the sink for us */
 607
 608     if (do_volume_adj_here)
 609         /* We had different channel maps, so we already did the adjustment */
 610         pa_cvolume_reset(volume, i->sink->sample_spec.channels);
 611     else if (i->thread_info.muted)
 612         /* We've both the same channel map, so let's have the sink do the adjustment for us*/
 613         pa_cvolume_mute(volume, i->sink->sample_spec.channels);
 614     else
 615         *volume = i->thread_info.volume;
 616
 617     return 0;
 618 }
 619
 620 /* Called from thread context */
 621 void pa_sink_input_drop(pa_sink_input *i, size_t nbytes /* in sink sample spec */) {
 622     pa_sink_input_assert_ref(i);
 623
 624     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 625     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 626     pa_assert(nbytes > 0);
 627
 628 /*     pa_log_debug("dropping %lu", (unsigned long) nbytes); */
 629
 630     pa_memblockq_drop(i->thread_info.render_memblockq, nbytes);
 631 }
 632
 633 /* Called from thread context */
 634 void pa_sink_input_process_rewind(pa_sink_input *i, size_t nbytes /* in sink sample spec */) {
 635     size_t lbq;
 636     pa_bool_t called;
 637     pa_sink_input_assert_ref(i);
 638
 639     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 640     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 641
 642 /*     pa_log_debug("rewind(%lu, %lu)", (unsigned long) nbytes, (unsigned long) i->thread_info.rewrite_nbytes); */
 643
 644     lbq = pa_memblockq_get_length(i->thread_info.render_memblockq);
 645
 646     if (nbytes > 0) {
 647         pa_log_debug("Have to rewind %lu bytes on render memblockq.", (unsigned long) nbytes);
 648         pa_memblockq_rewind(i->thread_info.render_memblockq, nbytes);
 649     }
 650
 651     if (i->thread_info.rewrite_nbytes == (size_t) -1) {
 652
 653         /* We were asked to drop all buffered data, and rerequest new
 654          * data from implementor the next time push() is called */
 655
 656         pa_memblockq_flush_write(i->thread_info.render_memblockq);
 657
 658     } else if (i->thread_info.rewrite_nbytes > 0) {
 659         size_t max_rewrite, amount;
 660
 661         /* Calculate how much make sense to rewrite at most */
 662         max_rewrite = nbytes + lbq;
 663
 664         /* Transform into local domain */
 665         if (i->thread_info.resampler)
 666             max_rewrite = pa_resampler_request(i->thread_info.resampler, max_rewrite);
 667
 668         /* Calculate how much of the rewinded data should actually be rewritten */
 669         amount = PA_MIN(i->thread_info.rewrite_nbytes, max_rewrite);
 670
 671         if (amount > 0) {
 672             pa_log_debug("Have to rewind %lu bytes on implementor.", (unsigned long) amount);
 673
 674             /* Tell the implementor */
 675             if (i->process_rewind)
 676                 i->process_rewind(i, amount);
 677             called = TRUE;
 678
 679             /* Convert back to to sink domain */
 680             if (i->thread_info.resampler)
 681                 amount = pa_resampler_result(i->thread_info.resampler, amount);
 682
 683             if (amount > 0)
 684                 /* Ok, now update the write pointer */
 685                 pa_memblockq_seek(i->thread_info.render_memblockq, - ((int64_t) amount), PA_SEEK_RELATIVE);
 686
 687             if (i->thread_info.rewrite_flush)
 688                 pa_memblockq_silence(i->thread_info.render_memblockq);
 689
 690             /* And reset the resampler */
 691             if (i->thread_info.resampler)
 692                 pa_resampler_reset(i->thread_info.resampler);
 693         }
 694     }
 695
 696     if (!called)
 697         if (i->process_rewind)
 698             i->process_rewind(i, 0);
 699
 700     i->thread_info.rewrite_nbytes = 0;
 701     i->thread_info.rewrite_flush = FALSE;
 702 }
 703
 704 /* Called from thread context */
 705 void pa_sink_input_update_max_rewind(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */) {
 706     pa_sink_input_assert_ref(i);
 707     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 708     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 709
 710     pa_memblockq_set_maxrewind(i->thread_info.render_memblockq, nbytes);
 711
 712     if (i->update_max_rewind)
 713         i->update_max_rewind(i, i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, nbytes) : nbytes);
 714 }
 715
 716 /* Called from thread context */
 717 void pa_sink_input_update_max_request(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */) {
 718     pa_sink_input_assert_ref(i);
 719     pa_assert(PA_SINK_INPUT_IS_LINKED(i->thread_info.state));
 720     pa_assert(pa_frame_aligned(nbytes, &i->sink->sample_spec));
 721
 722     if (i->update_max_request)
 723         i->update_max_request(i, i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, nbytes) : nbytes);
 724 }
 725
 726 /* Called from thread context */
 727 static pa_usec_t fixup_latency(pa_sink *s, pa_usec_t usec) {
 728     pa_sink_assert_ref(s);
 729
 730     if (usec == (pa_usec_t) -1)
 731         return usec;
 732
 733     if (s->thread_info.max_latency > 0 && usec > s->thread_info.max_latency)
 734         usec = s->thread_info.max_latency;
 735
 736     if (s->thread_info.min_latency > 0 && usec < s->thread_info.min_latency)
 737         usec = s->thread_info.min_latency;
 738
 739     return usec;
 740 }
 741
 742 /* Called from thread context */
 743 pa_usec_t pa_sink_input_set_requested_latency_within_thread(pa_sink_input *i, pa_usec_t usec) {
 744     pa_sink_input_assert_ref(i);
 745
 746     usec = fixup_latency(i->sink, usec);
 747     i->thread_info.requested_sink_latency = usec;
 748     pa_sink_invalidate_requested_latency(i->sink);
 749
 750     return usec;
 751 }
 752
 753 /* Called from main context */
 754 pa_usec_t pa_sink_input_set_requested_latency(pa_sink_input *i, pa_usec_t usec) {
 755     pa_sink_input_assert_ref(i);
 756
 757     if (PA_SINK_INPUT_IS_LINKED(i->state))
 758         pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY, &usec, 0, NULL) == 0);
 759     else {
 760         /* If this sink input is not realized yet, we have to touch
 761          * the thread info data directly */
 762
 763         usec = fixup_latency(i->sink, usec);
 764         i->thread_info.requested_sink_latency = usec;
 765         i->sink->thread_info.requested_latency_valid = FALSE;
 766     }
 767
 768     return usec;
 769 }
 770
 771 /* Called from main context */
 772 pa_usec_t pa_sink_input_get_requested_latency(pa_sink_input *i) {
 773     pa_usec_t usec = 0;
 774
 775     pa_sink_input_assert_ref(i);
 776
 777     if (PA_SINK_INPUT_IS_LINKED(i->state))
 778         pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY, &usec, 0, NULL) == 0);
 779     else
 780         /* If this sink input is not realized yet, we have to touch
 781          * the thread info data directly */
 782         usec = i->thread_info.requested_sink_latency;
 783
 784     return usec;
 785 }
 786
 787 /* Called from main context */
 788 void pa_sink_input_set_volume(pa_sink_input *i, const pa_cvolume *volume) {
 789     pa_sink_input_assert_ref(i);
 790     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 791     pa_assert(volume);
 792
 793     if (pa_cvolume_equal(&i->volume, volume))
 794         return;
 795
 796     i->volume = *volume;
 797
 798     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_VOLUME, &i->volume, 0, NULL) == 0);
 799     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 800 }
 801
 802 /* Called from main context */
 803 const pa_cvolume *pa_sink_input_get_volume(pa_sink_input *i) {
 804     pa_sink_input_assert_ref(i);
 805     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 806
 807     return &i->volume;
 808 }
 809
 810 /* Called from main context */
 811 void pa_sink_input_set_mute(pa_sink_input *i, pa_bool_t mute) {
 812     pa_assert(i);
 813     pa_sink_input_assert_ref(i);
 814     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 815
 816     if (!i->muted == !mute)
 817         return;
 818
 819     i->muted = mute;
 820
 821     pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
 822     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 823 }
 824
 825 /* Called from main context */
 826 pa_bool_t pa_sink_input_get_mute(pa_sink_input *i) {
 827     pa_sink_input_assert_ref(i);
 828     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 829
 830     return i->muted;
 831 }
 832
 833 /* Called from main context */
 834 void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b) {
 835     pa_sink_input_assert_ref(i);
 836     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 837
 838     sink_input_set_state(i, b ? PA_SINK_INPUT_CORKED : PA_SINK_INPUT_RUNNING);
 839 }
 840
 841 /* Called from main context */
 842 int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate) {
 843     pa_sink_input_assert_ref(i);
 844     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 845     pa_return_val_if_fail(i->thread_info.resampler, -1);
 846
 847     if (i->sample_spec.rate == rate)
 848         return 0;
 849
 850     i->sample_spec.rate = rate;
 851
 852     pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
 853
 854     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 855     return 0;
 856 }
 857
 858 /* Called from main context */
 859 void pa_sink_input_set_name(pa_sink_input *i, const char *name) {
 860     const char *old;
 861     pa_sink_input_assert_ref(i);
 862
 863     if (!name && !pa_proplist_contains(i->proplist, PA_PROP_MEDIA_NAME))
 864         return;
 865
 866     old = pa_proplist_gets(i->proplist, PA_PROP_MEDIA_NAME);
 867
 868     if (old && name && !strcmp(old, name))
 869         return;
 870
 871     if (name)
 872         pa_proplist_sets(i->proplist, PA_PROP_MEDIA_NAME, name);
 873     else
 874         pa_proplist_unset(i->proplist, PA_PROP_MEDIA_NAME);
 875
 876     if (PA_SINK_INPUT_IS_LINKED(i->state)) {
 877         pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_PROPLIST_CHANGED], i);
 878         pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
 879     }
 880 }
 881
 882 /* Called from main context */
 883 pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i) {
 884     pa_sink_input_assert_ref(i);
 885
 886     return i->resample_method;
 887 }
 888
 889 /* Called from main context */
 890 int pa_sink_input_move_to(pa_sink_input *i, pa_sink *dest) {
 891     pa_resampler *new_resampler;
 892     pa_sink *origin;
 893     pa_sink_input_move_hook_data hook_data;
 894     pa_source_output *o, *p = NULL;
 895
 896     pa_sink_input_assert_ref(i);
 897     pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
 898     pa_sink_assert_ref(dest);
 899
 900     origin = i->sink;
 901
 902     if (dest == origin)
 903         return 0;
 904
 905     if (i->flags & PA_SINK_INPUT_DONT_MOVE)
 906         return -1;
 907
 908     if (i->sync_next || i->sync_prev) {
 909         pa_log_warn("Moving synchronised streams not supported.");
 910         return -1;
 911     }
 912
 913     if (pa_idxset_size(dest->inputs) >= PA_MAX_INPUTS_PER_SINK) {
 914         pa_log_warn("Failed to move sink input: too many inputs per sink.");
 915         return -1;
 916     }
 917
 918     /* Kill directly connected outputs */
 919     while ((o = pa_idxset_first(i->direct_outputs, NULL))) {
 920         pa_assert(o != p);
 921         pa_source_output_kill(o);
 922         p = o;
 923     }
 924
 925     if (i->thread_info.resampler &&
 926         pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
 927         pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
 928
 929         /* Try to reuse the old resampler if possible */
 930         new_resampler = i->thread_info.resampler;
 931
 932     else if ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ||
 933              !pa_sample_spec_equal(&i->sample_spec, &dest->sample_spec) ||
 934              !pa_channel_map_equal(&i->channel_map, &dest->channel_map)) {
 935
 936         /* Okey, we need a new resampler for the new sink */
 937
 938         if (!(new_resampler = pa_resampler_new(
 939                       dest->core->mempool,
 940                       &i->sample_spec, &i->channel_map,
 941                       &dest->sample_spec, &dest->channel_map,
 942                       i->resample_method,
 943                       ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
 944                       ((i->flags & PA_SINK_INPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
 945                       (i->core->disable_remixing || (i->flags & PA_SINK_INPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
 946             pa_log_warn("Unsupported resampling operation.");
 947             return -1;
 948         }
 949     } else
 950         new_resampler = NULL;
 951
 952     hook_data.sink_input = i;
 953     hook_data.destination = dest;
 954     pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE], &hook_data);
 955
 956     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_START_MOVE, i, 0, NULL) == 0);
 957
 958     pa_idxset_remove_by_data(origin->inputs, i, NULL);
 959     pa_idxset_put(dest->inputs, i, NULL);
 960     i->sink = dest;
 961
 962     if (pa_sink_input_get_state(i) == PA_SINK_INPUT_CORKED) {
 963         pa_assert_se(origin->n_corked-- >= 1);
 964         dest->n_corked++;
 965     }
 966
 967     /* Replace resampler and render queue */
 968     if (new_resampler != i->thread_info.resampler) {
 969
 970         if (i->thread_info.resampler)
 971             pa_resampler_free(i->thread_info.resampler);
 972         i->thread_info.resampler = new_resampler;
 973
 974         pa_memblockq_free(i->thread_info.render_memblockq);
 975
 976         i->thread_info.render_memblockq = pa_memblockq_new(
 977                 0,
 978                 MEMBLOCKQ_MAXLENGTH,
 979                 0,
 980                 pa_frame_size(&i->sink->sample_spec),
 981                 0,
 982                 1,
 983                 0,
 984                 &i->sink->silence);
 985     }
 986
 987     pa_sink_update_status(origin);
 988     pa_sink_update_status(dest);
 989
 990     pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_FINISH_MOVE, i, 0, NULL) == 0);
 991
 992     if (i->moved)
 993         i->moved(i);
 994
 995     pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_POST], i);
 996
 997     pa_log_debug("Successfully moved sink input %i from %s to %s.", i->index, origin->name, dest->name);
 998
 999     /* Notify everyone */
1000     pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
1001
1002     return 0;
1003 }
1004
1005 /* Called from IO thread context */
1006 void pa_sink_input_set_state_within_thread(pa_sink_input *i, pa_sink_input_state_t state) {
1007     pa_sink_input_assert_ref(i);
1008
1009     if (state == i->thread_info.state)
1010         return;
1011
1012     if ((state == PA_SINK_INPUT_DRAINED || state == PA_SINK_INPUT_RUNNING) &&
1013         !(i->thread_info.state == PA_SINK_INPUT_DRAINED || i->thread_info.state != PA_SINK_INPUT_RUNNING))
1014         pa_atomic_store(&i->thread_info.drained, 1);
1015
1016     if (state == PA_SINK_INPUT_CORKED && i->thread_info.state != PA_SINK_INPUT_CORKED) {
1017
1018         /* This will tell the implementing sink input driver to rewind
1019          * so that the unplayed already mixed data is not lost */
1020         pa_sink_input_request_rewind(i, 0, TRUE, TRUE);
1021
1022     } else if (i->thread_info.state == PA_SINK_INPUT_CORKED && state != PA_SINK_INPUT_CORKED) {
1023
1024         /* OK, we're being uncorked. Make sure we're not rewound when
1025          * the hw buffer is remixed and request a remix. */
1026         pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
1027     }
1028
1029     if (i->state_change)
1030         i->state_change(i, state);
1031
1032     i->thread_info.state = state;
1033 }
1034
1035 /* Called from thread context, except when it is not. */
1036 int pa_sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
1037     pa_sink_input *i = PA_SINK_INPUT(o);
1038     pa_sink_input_assert_ref(i);
1039
1040     switch (code) {
1041
1042         case PA_SINK_INPUT_MESSAGE_SET_VOLUME:
1043             i->thread_info.volume = *((pa_cvolume*) userdata);
1044             pa_sink_input_request_rewind(i, 0, TRUE, FALSE);
1045             return 0;
1046
1047         case PA_SINK_INPUT_MESSAGE_SET_MUTE:
1048             i->thread_info.muted = PA_PTR_TO_UINT(userdata);
1049             pa_sink_input_request_rewind(i, 0, TRUE, FALSE);
1050             return 0;
1051
1052         case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
1053             pa_usec_t *r = userdata;
1054             pa_usec_t sink_usec = 0;
1055
1056             r[0] += pa_bytes_to_usec(pa_memblockq_get_length(i->thread_info.render_memblockq), &i->sink->sample_spec);
1057
1058             if (i->sink->parent.process_msg(PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_GET_LATENCY, &sink_usec, 0, NULL) >= 0)
1059                 r[1] += sink_usec;
1060
1061             return 0;
1062         }
1063
1064         case PA_SINK_INPUT_MESSAGE_SET_RATE:
1065
1066             i->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
1067             pa_resampler_set_input_rate(i->thread_info.resampler, PA_PTR_TO_UINT(userdata));
1068
1069             return 0;
1070
1071         case PA_SINK_INPUT_MESSAGE_SET_STATE: {
1072             pa_sink_input *ssync;
1073
1074             pa_sink_input_set_state_within_thread(i, PA_PTR_TO_UINT(userdata));
1075
1076             for (ssync = i->thread_info.sync_prev; ssync; ssync = ssync->thread_info.sync_prev)
1077                 pa_sink_input_set_state_within_thread(ssync, PA_PTR_TO_UINT(userdata));
1078
1079             for (ssync = i->thread_info.sync_next; ssync; ssync = ssync->thread_info.sync_next)
1080                 pa_sink_input_set_state_within_thread(ssync, PA_PTR_TO_UINT(userdata));
1081
1082             return 0;
1083         }
1084
1085         case PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY: {
1086             pa_usec_t *usec = userdata;
1087
1088             *usec = pa_sink_input_set_requested_latency_within_thread(i, *usec);
1089             return 0;
1090         }
1091
1092         case PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY: {
1093             pa_usec_t *r = userdata;
1094
1095             *r = i->thread_info.requested_sink_latency;
1096             return 0;
1097         }
1098     }
1099
1100     return -1;
1101 }
1102
1103 /* Called from main thread */
1104 pa_sink_input_state_t pa_sink_input_get_state(pa_sink_input *i) {
1105     pa_sink_input_assert_ref(i);
1106
1107     if (i->state == PA_SINK_INPUT_RUNNING || i->state == PA_SINK_INPUT_DRAINED)
1108         return pa_atomic_load(&i->thread_info.drained) ? PA_SINK_INPUT_DRAINED : PA_SINK_INPUT_RUNNING;
1109
1110     return i->state;
1111 }
1112
1113 /* Called from IO context */
1114 pa_bool_t pa_sink_input_safe_to_remove(pa_sink_input *i) {
1115     pa_sink_input_assert_ref(i);
1116
1117     if (PA_SINK_INPUT_IS_LINKED(i->thread_info.state))
1118         return pa_memblockq_is_empty(i->thread_info.render_memblockq);
1119
1120     return TRUE;
1121 }
1122
1123 /* Called from IO context */
1124 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) {
1125     size_t lbq;
1126
1127     /* If 'rewrite' is TRUE the sink is rewound as far as requested
1128      * and possible and the exact value of this is passed back the
1129      * implementor via process_rewind(). If 'flush' is also TRUE all
1130      * already rendered data is also dropped.
1131      *
1132      * If 'rewrite' is FALSE the sink is rewound as far as requested
1133      * and possible and the already rendered data is dropped so that
1134      * in the next iteration we read new data from the
1135      * implementor. This implies 'flush' is TRUE. */
1136
1137     pa_sink_input_assert_ref(i);
1138     pa_assert(i->thread_info.rewrite_nbytes == 0);
1139
1140 /*     pa_log_debug("request rewrite %lu", (unsigned long) nbytes); */
1141
1142     /* We don't take rewind requests while we are corked */
1143     if (i->thread_info.state == PA_SINK_INPUT_CORKED)
1144         return;
1145
1146     pa_assert(rewrite || flush);
1147
1148     /* Calculate how much we can rewind locally without having to
1149      * touch the sink */
1150     if (rewrite)
1151         lbq = pa_memblockq_get_length(i->thread_info.render_memblockq);
1152     else
1153         lbq = 0;
1154
1155     /* Check if rewinding for the maximum is requested, and if so, fix up */
1156     if (nbytes <= 0) {
1157
1158         /* Calculate maximum number of bytes that could be rewound in theory */
1159         nbytes = i->sink->thread_info.max_rewind + lbq;
1160
1161         /* Transform from sink domain */
1162         if (i->thread_info.resampler)
1163             nbytes = pa_resampler_request(i->thread_info.resampler, nbytes);
1164     }
1165
1166     if (rewrite) {
1167         /* Make sure to not overwrite over underruns */
1168         if (nbytes > i->thread_info.playing_for)
1169             nbytes = (size_t) i->thread_info.playing_for;
1170
1171         i->thread_info.rewrite_nbytes = nbytes;
1172     } else
1173         i->thread_info.rewrite_nbytes = (size_t) -1;
1174
1175     i->thread_info.rewrite_flush = flush && i->thread_info.rewrite_nbytes != 0;
1176
1177     /* Transform to sink domain */
1178     if (i->thread_info.resampler)
1179         nbytes = pa_resampler_result(i->thread_info.resampler, nbytes);
1180
1181     if (nbytes > lbq)
1182         pa_sink_request_rewind(i->sink, nbytes - lbq);
1183     else
1184         /* This call will make sure process_rewind() is called later */
1185         pa_sink_request_rewind(i->sink, 0);
1186 }
1187
1188 /* Called from main context */
1189 pa_memchunk* pa_sink_input_get_silence(pa_sink_input *i, pa_memchunk *ret) {
1190     pa_sink_input_assert_ref(i);
1191     pa_assert(ret);
1192
1193     pa_silence_memchunk_get(
1194                 &i->sink->core->silence_cache,
1195                 i->sink->core->mempool,
1196                 ret,
1197                 &i->sample_spec,
1198                 i->thread_info.resampler ? pa_resampler_max_block_size(i->thread_info.resampler) : 0);
1199
1200     return ret;
1201 }