code.delx.au - pulseaudio/blob - src/modules/module-filter-apply.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2011 Colin Guthrie
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <pulse/timeval.h>
  27 #include <pulse/rtclock.h>
  28 #include <pulse/i18n.h>
  29 #include <pulse/xmalloc.h>
  30
  31 #include <pulsecore/macro.h>
  32 #include <pulsecore/hashmap.h>
  33 #include <pulsecore/hook-list.h>
  34 #include <pulsecore/core.h>
  35 #include <pulsecore/core-util.h>
  36 #include <pulsecore/sink-input.h>
  37 #include <pulsecore/modargs.h>
  38
  39 #include "module-filter-apply-symdef.h"
  40
  41 #define PA_PROP_FILTER_APPLY_MOVING "filter.apply.moving"
  42
  43 PA_MODULE_AUTHOR("Colin Guthrie");
  44 PA_MODULE_DESCRIPTION("Load filter sinks automatically when needed");
  45 PA_MODULE_VERSION(PACKAGE_VERSION);
  46 PA_MODULE_LOAD_ONCE(TRUE);
  47 PA_MODULE_USAGE(_("autoclean=<automatically unload unused filters?>"));
  48
  49 static const char* const valid_modargs[] = {
  50     "autoclean",
  51     NULL
  52 };
  53
  54 #define DEFAULT_AUTOCLEAN TRUE
  55 #define HOUSEKEEPING_INTERVAL (10 * PA_USEC_PER_SEC)
  56
  57 struct filter {
  58     char *name;
  59     uint32_t module_index;
  60     pa_bool_t is_sink;
  61     pa_object *parent_obj;      /* source or sink that the filter is connected to */
  62     pa_object *obj;             /* source or sink of the filter */
  63 };
  64
  65 struct userdata {
  66     pa_core *core;
  67     pa_hashmap *filters;
  68     pa_hook_slot
  69         *sink_input_put_slot,
  70         *sink_input_move_finish_slot,
  71         *sink_input_proplist_slot,
  72         *sink_input_unlink_slot,
  73         *sink_unlink_slot,
  74         *source_output_put_slot,
  75         *source_output_move_finish_slot,
  76         *source_output_proplist_slot,
  77         *source_output_unlink_slot,
  78         *source_unlink_slot;
  79     pa_bool_t autoclean;
  80     pa_time_event *housekeeping_time_event;
  81 };
  82
  83 static unsigned filter_hash(const void *p) {
  84     const struct filter *f = p;
  85
  86     if (f->is_sink)
  87         return (unsigned) (PA_SINK(f->parent_obj)->index + pa_idxset_string_hash_func(f->name));
  88     else
  89         return (unsigned) ((PA_SOURCE(f->parent_obj)->index << 16) + pa_idxset_string_hash_func(f->name));
  90 }
  91
  92 static int filter_compare(const void *a, const void *b) {
  93     const struct filter *fa = a, *fb = b;
  94     int r;
  95
  96     if (fa->parent_obj != fb->parent_obj)
  97         return 1;
  98     if ((r = strcmp(fa->name, fb->name)))
  99         return r;
 100
 101     return 0;
 102 }
 103
 104 static struct filter *filter_new(const char *name, pa_object* parent_obj, pa_bool_t is_sink) {
 105     struct filter *f;
 106
 107     f = pa_xnew(struct filter, 1);
 108     f->name = pa_xstrdup(name);
 109     pa_assert_se(f->parent_obj = parent_obj);
 110     f->is_sink = is_sink;
 111     f->module_index = PA_INVALID_INDEX;
 112     f->obj = NULL;
 113     return f;
 114 }
 115
 116 static void filter_free(struct filter *f) {
 117     pa_assert(f);
 118
 119     pa_xfree(f->name);
 120     pa_xfree(f);
 121 }
 122
 123 static const char* should_filter(pa_object *o, pa_bool_t is_sink_input) {
 124     const char *apply;
 125     pa_proplist *pl;
 126
 127     if (is_sink_input)
 128         pl = PA_SINK_INPUT(o)->proplist;
 129     else
 130         pl = PA_SOURCE_OUTPUT(o)->proplist;
 131
 132     /* If the stream doesn't what any filter, then let it be. */
 133     if ((apply = pa_proplist_gets(pl, PA_PROP_FILTER_APPLY)) && !pa_streq(apply, "")) {
 134         const char* suppress = pa_proplist_gets(pl, PA_PROP_FILTER_SUPPRESS);
 135
 136         if (!suppress || !pa_streq(suppress, apply))
 137             return apply;
 138     }
 139
 140     return NULL;
 141 }
 142
 143 static pa_bool_t nothing_attached(pa_object *obj, pa_bool_t is_sink)
 144 {
 145     if (is_sink)
 146         return pa_idxset_isempty(PA_SINK(obj)->inputs);
 147     else
 148         return pa_idxset_isempty(PA_SOURCE(obj)->outputs);
 149 }
 150
 151 static void housekeeping_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *t, void *userdata) {
 152     struct userdata *u = userdata;
 153     struct filter *filter;
 154     void *state;
 155
 156     pa_assert(a);
 157     pa_assert(e);
 158     pa_assert(u);
 159
 160     pa_assert(e == u->housekeeping_time_event);
 161     u->core->mainloop->time_free(u->housekeeping_time_event);
 162     u->housekeeping_time_event = NULL;
 163
 164     PA_HASHMAP_FOREACH(filter, u->filters, state) {
 165         if (filter->obj && nothing_attached(filter->obj, filter->is_sink)) {
 166             uint32_t idx;
 167
 168             pa_log_debug("Detected filter %s as no longer used. Unloading.", filter->name);
 169             idx = filter->module_index;
 170             pa_hashmap_remove(u->filters, filter);
 171             filter_free(filter);
 172             pa_module_unload_request_by_index(u->core, idx, TRUE);
 173         }
 174     }
 175
 176     pa_log_info("Housekeeping Done.");
 177 }
 178
 179 static void trigger_housekeeping(struct userdata *u) {
 180     pa_assert(u);
 181
 182     if (!u->autoclean)
 183         return;
 184
 185     if (u->housekeeping_time_event)
 186         return;
 187
 188     u->housekeeping_time_event = pa_core_rttime_new(u->core, pa_rtclock_now() + HOUSEKEEPING_INTERVAL, housekeeping_time_callback, u);
 189 }
 190
 191 static int do_move(pa_object *obj, pa_object *parent, pa_bool_t restore, pa_bool_t is_input) {
 192     if (is_input)
 193         return pa_sink_input_move_to(PA_SINK_INPUT(obj), PA_SINK(parent), restore);
 194     else
 195         return pa_source_output_move_to(PA_SOURCE_OUTPUT(obj), PA_SOURCE(parent), restore);
 196 }
 197
 198 static void move_object_for_filter(pa_object *o, struct filter* filter, pa_bool_t restore, pa_bool_t is_sink_input) {
 199     pa_object *parent;
 200     pa_proplist *pl;
 201     const char *name;
 202
 203     pa_assert(o);
 204     pa_assert(filter);
 205
 206     pa_assert_se(parent = (restore ? filter->parent_obj : filter->obj));
 207
 208     if (is_sink_input) {
 209         pl = PA_SINK_INPUT(o)->proplist;
 210         name = PA_SINK(parent)->name;
 211     } else {
 212         pl = PA_SOURCE_OUTPUT(o)->proplist;
 213         name = PA_SOURCE(parent)->name;
 214     }
 215
 216     pa_proplist_sets(pl, PA_PROP_FILTER_APPLY_MOVING, "1");
 217
 218     if (do_move(o, parent, FALSE, is_sink_input) < 0)
 219         pa_log_info("Failed to move %s for \"%s\" to <%s>.", is_sink_input ? "sink-input" : "source-output",
 220                     pa_strnull(pa_proplist_gets(pl, PA_PROP_APPLICATION_NAME)), name);
 221     else
 222         pa_log_info("Sucessfully moved %s for \"%s\" to <%s>.", is_sink_input ? "sink-input" : "source-output",
 223                     pa_strnull(pa_proplist_gets(pl, PA_PROP_APPLICATION_NAME)), name);
 224
 225     pa_proplist_unset(pl, PA_PROP_FILTER_APPLY_MOVING);
 226 }
 227
 228 static void find_filters_for_module(struct userdata *u, pa_module *m, const char *name) {
 229     uint32_t idx;
 230     pa_sink *sink;
 231     pa_source *source;
 232     struct filter *fltr;
 233
 234     PA_IDXSET_FOREACH(sink, u->core->sinks, idx) {
 235         if (sink->module == m) {
 236             pa_assert(sink->input_to_master != NULL);
 237
 238             fltr = filter_new(name, PA_OBJECT(sink->input_to_master->sink), TRUE);
 239             fltr->module_index = m->index;
 240             fltr->obj = PA_OBJECT(sink);
 241
 242             pa_hashmap_put(u->filters, fltr, fltr);
 243         }
 244     }
 245
 246     PA_IDXSET_FOREACH(source, u->core->sources, idx) {
 247         if (source->module == m && !source->monitor_of) {
 248             pa_assert(source->output_from_master != NULL);
 249
 250             fltr = filter_new(name, PA_OBJECT(source->output_from_master->source), FALSE);
 251             fltr->module_index = m->index;
 252             fltr->obj = PA_OBJECT(source);
 253
 254             pa_hashmap_put(u->filters, fltr, fltr);
 255         }
 256     }
 257 }
 258
 259 static pa_bool_t can_unload_module(struct userdata *u, uint32_t idx) {
 260     void *state;
 261     struct filter *filter;
 262
 263     /* Check if any other struct filters point to the same module */
 264     PA_HASHMAP_FOREACH(filter, u->filters, state) {
 265         if (filter->module_index == idx && !nothing_attached(filter->obj, pa_sink_isinstance(filter->obj)))
 266             return FALSE;
 267     }
 268
 269     return TRUE;
 270 }
 271
 272 static pa_hook_result_t process(struct userdata *u, pa_object *o, pa_bool_t is_sink_input) {
 273     const char *want;
 274     pa_bool_t done_something = FALSE;
 275
 276     pa_object *parent; /* source/sink of the given source-output/sink-input */
 277     const char *parent_name;
 278     pa_module *module;
 279
 280     if (is_sink_input) {
 281         parent = PA_OBJECT(PA_SINK_INPUT(o)->sink);
 282         parent_name = PA_SINK_INPUT(o)->sink->name;
 283         module = PA_SINK_INPUT(o)->sink->module;
 284     } else {
 285         parent = PA_OBJECT(PA_SOURCE_OUTPUT(o)->source);
 286         parent_name = PA_SOURCE_OUTPUT(o)->source->name;
 287         module = PA_SOURCE_OUTPUT(o)->source->module;
 288     }
 289
 290     /* If there is no sink yet, we can't do much */
 291     if (!parent)
 292         return PA_HOOK_OK;
 293
 294     /* If the stream doesn't what any filter, then let it be. */
 295     if ((want = should_filter(o, is_sink_input))) {
 296         char *module_name;
 297         struct filter *fltr, *filter;
 298
 299         /* We need to ensure the SI is playing on a sink of this type
 300          * attached to the sink it's "officially" playing on */
 301
 302         if (!module)
 303             return PA_HOOK_OK;
 304
 305         module_name = pa_sprintf_malloc("module-%s", want);
 306         if (pa_streq(module->name, module_name)) {
 307             pa_log_debug("Stream appears to be playing on an appropriate sink already. Ignoring.");
 308             pa_xfree(module_name);
 309             return PA_HOOK_OK;
 310         }
 311
 312         fltr = filter_new(want, parent, is_sink_input);
 313
 314         if (!(filter = pa_hashmap_get(u->filters, fltr))) {
 315             char *args;
 316             pa_module *m;
 317
 318             args = pa_sprintf_malloc("autoloaded=1 %s_master=%s", is_sink_input ? "sink" : "source", parent_name);
 319             pa_log_debug("Loading %s with arguments '%s'", module_name, args);
 320
 321             if ((m = pa_module_load(u->core, module_name, args))) {
 322                 find_filters_for_module(u, m, want);
 323                 filter = pa_hashmap_get(u->filters, fltr);
 324                 done_something = TRUE;
 325             }
 326             pa_xfree(args);
 327         }
 328
 329         pa_xfree(fltr);
 330
 331         if (!filter) {
 332             pa_log("Unable to load %s for <%s>", module_name, parent_name);
 333             pa_xfree(module_name);
 334             return PA_HOOK_OK;
 335         }
 336         pa_xfree(module_name);
 337
 338         if (filter->obj) {
 339             /* We can move the sink_input now as the know the destination.
 340              * If this isn't true, we will do it later when the sink appears. */
 341             move_object_for_filter(o, filter, FALSE, is_sink_input);
 342             done_something = TRUE;
 343         }
 344     } else {
 345         void *state;
 346         struct filter *filter = NULL;
 347
 348         /* We do not want to filter... but are we already filtered?
 349          * This can happen if an input's proplist changes */
 350         PA_HASHMAP_FOREACH(filter, u->filters, state) {
 351             if (parent == filter->obj) {
 352                 move_object_for_filter(o, filter, TRUE, is_sink_input);
 353                 done_something = TRUE;
 354                 break;
 355             }
 356         }
 357     }
 358
 359     if (done_something)
 360         trigger_housekeeping(u);
 361
 362     return PA_HOOK_OK;
 363 }
 364
 365 static pa_hook_result_t sink_input_put_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
 366     pa_core_assert_ref(core);
 367     pa_sink_input_assert_ref(i);
 368
 369     return process(u, PA_OBJECT(i), TRUE);
 370 }
 371
 372 static pa_hook_result_t sink_input_move_finish_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
 373     pa_core_assert_ref(core);
 374     pa_sink_input_assert_ref(i);
 375
 376     if (pa_proplist_gets(i->proplist, PA_PROP_FILTER_APPLY_MOVING))
 377         return PA_HOOK_OK;
 378
 379     return process(u, PA_OBJECT(i), TRUE);
 380 }
 381
 382 static pa_hook_result_t sink_input_proplist_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
 383     pa_core_assert_ref(core);
 384     pa_sink_input_assert_ref(i);
 385
 386     return process(u, PA_OBJECT(i), TRUE);
 387 }
 388
 389 static pa_hook_result_t sink_input_unlink_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
 390     pa_core_assert_ref(core);
 391     pa_sink_input_assert_ref(i);
 392
 393     pa_assert(u);
 394
 395     if (pa_hashmap_size(u->filters) > 0)
 396         trigger_housekeeping(u);
 397
 398     return PA_HOOK_OK;
 399 }
 400
 401 static pa_hook_result_t sink_unlink_cb(pa_core *core, pa_sink *sink, struct userdata *u) {
 402     void *state;
 403     struct filter *filter = NULL;
 404
 405     pa_core_assert_ref(core);
 406     pa_sink_assert_ref(sink);
 407     pa_assert(u);
 408
 409     /* If either the parent or the sink we've loaded disappears,
 410      * we should remove it from our hashmap */
 411     PA_HASHMAP_FOREACH(filter, u->filters, state) {
 412         if (filter->parent_obj == PA_OBJECT(sink) || filter->obj == PA_OBJECT(sink)) {
 413             uint32_t idx;
 414
 415             /* Attempt to rescue any streams to the parent sink as this is likely
 416              * the best course of action (as opposed to a generic rescue via
 417              * module-rescue-streams */
 418             if (filter->obj == PA_OBJECT(sink)) {
 419                 pa_sink_input *i;
 420
 421                 PA_IDXSET_FOREACH(i, sink->inputs, idx)
 422                     move_object_for_filter(PA_OBJECT(i), filter, TRUE, TRUE);
 423             }
 424
 425             idx = filter->module_index;
 426             pa_hashmap_remove(u->filters, filter);
 427             filter_free(filter);
 428
 429             if (can_unload_module(u, idx))
 430                 pa_module_unload_request_by_index(u->core, idx, TRUE);
 431         }
 432     }
 433
 434     return PA_HOOK_OK;
 435 }
 436
 437 static pa_hook_result_t source_output_put_cb(pa_core *core, pa_source_output *o, struct userdata *u) {
 438     pa_core_assert_ref(core);
 439     pa_source_output_assert_ref(o);
 440
 441     return process(u, PA_OBJECT(o), FALSE);
 442 }
 443
 444 static pa_hook_result_t source_output_move_finish_cb(pa_core *core, pa_source_output *o, struct userdata *u) {
 445     pa_core_assert_ref(core);
 446     pa_source_output_assert_ref(o);
 447
 448     if (pa_proplist_gets(o->proplist, PA_PROP_FILTER_APPLY_MOVING))
 449         return PA_HOOK_OK;
 450
 451     return process(u, PA_OBJECT(o), FALSE);
 452 }
 453
 454 static pa_hook_result_t source_output_proplist_cb(pa_core *core, pa_source_output *o, struct userdata *u) {
 455     pa_core_assert_ref(core);
 456     pa_source_output_assert_ref(o);
 457
 458     return process(u, PA_OBJECT(o), FALSE);
 459 }
 460
 461 static pa_hook_result_t source_output_unlink_cb(pa_core *core, pa_source_output *o, struct userdata *u) {
 462     pa_core_assert_ref(core);
 463     pa_source_output_assert_ref(o);
 464
 465     pa_assert(u);
 466
 467     if (pa_hashmap_size(u->filters) > 0)
 468         trigger_housekeeping(u);
 469
 470     return PA_HOOK_OK;
 471 }
 472
 473 static pa_hook_result_t source_unlink_cb(pa_core *core, pa_source *source, struct userdata *u) {
 474     void *state;
 475     struct filter *filter = NULL;
 476
 477     pa_core_assert_ref(core);
 478     pa_source_assert_ref(source);
 479     pa_assert(u);
 480
 481     /* If either the parent or the source we've loaded disappears,
 482      * we should remove it from our hashmap */
 483     PA_HASHMAP_FOREACH(filter, u->filters, state) {
 484         if (filter->parent_obj == PA_OBJECT(source) || filter->obj == PA_OBJECT(source)) {
 485             uint32_t idx;
 486
 487             /* Attempt to rescue any streams to the parent source as this is likely
 488              * the best course of action (as opposed to a generic rescue via
 489              * module-rescue-streams */
 490             if (filter->obj == PA_OBJECT(source)) {
 491                 pa_source_output *o;
 492
 493                 PA_IDXSET_FOREACH(o, source->outputs, idx)
 494                     move_object_for_filter(PA_OBJECT(o), filter, TRUE, FALSE);
 495             }
 496
 497             idx = filter->module_index;
 498             pa_hashmap_remove(u->filters, filter);
 499             filter_free(filter);
 500
 501             if (can_unload_module(u, idx))
 502                 pa_module_unload_request_by_index(u->core, idx, TRUE);
 503         }
 504     }
 505
 506     return PA_HOOK_OK;
 507 }
 508
 509 int pa__init(pa_module *m) {
 510     pa_modargs *ma = NULL;
 511     struct userdata *u;
 512
 513     pa_assert(m);
 514
 515     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 516         pa_log("Failed to parse module arguments");
 517         goto fail;
 518     }
 519
 520     m->userdata = u = pa_xnew0(struct userdata, 1);
 521
 522     u->core = m->core;
 523
 524     u->autoclean = DEFAULT_AUTOCLEAN;
 525     if (pa_modargs_get_value_boolean(ma, "autoclean", &u->autoclean) < 0) {
 526         pa_log("Failed to parse autoclean value");
 527         goto fail;
 528     }
 529
 530     u->filters = pa_hashmap_new(filter_hash, filter_compare);
 531
 532     u->sink_input_put_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_PUT], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_put_cb, u);
 533     u->sink_input_move_finish_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_FINISH], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_move_finish_cb, u);
 534     u->sink_input_proplist_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_PROPLIST_CHANGED], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_proplist_cb, u);
 535     u->sink_input_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_unlink_cb, u);
 536     u->sink_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) sink_unlink_cb, u);
 537     u->source_output_put_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PUT], PA_HOOK_LATE, (pa_hook_cb_t) source_output_put_cb, u);
 538     u->source_output_move_finish_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_MOVE_FINISH], PA_HOOK_LATE, (pa_hook_cb_t) source_output_move_finish_cb, u);
 539     u->source_output_proplist_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PROPLIST_CHANGED], PA_HOOK_LATE, (pa_hook_cb_t) source_output_proplist_cb, u);
 540     u->source_output_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) source_output_unlink_cb, u);
 541     u->source_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) source_unlink_cb, u);
 542
 543     pa_modargs_free(ma);
 544
 545     return 0;
 546
 547 fail:
 548     pa__done(m);
 549
 550     if (ma)
 551         pa_modargs_free(ma);
 552
 553     return -1;
 554 }
 555
 556 void pa__done(pa_module *m) {
 557     struct userdata* u;
 558
 559     pa_assert(m);
 560
 561     if (!(u = m->userdata))
 562         return;
 563
 564     if (u->sink_input_put_slot)
 565         pa_hook_slot_free(u->sink_input_put_slot);
 566     if (u->sink_input_move_finish_slot)
 567         pa_hook_slot_free(u->sink_input_move_finish_slot);
 568     if (u->sink_input_proplist_slot)
 569         pa_hook_slot_free(u->sink_input_proplist_slot);
 570     if (u->sink_input_unlink_slot)
 571         pa_hook_slot_free(u->sink_input_unlink_slot);
 572     if (u->sink_unlink_slot)
 573         pa_hook_slot_free(u->sink_unlink_slot);
 574     if (u->source_output_put_slot)
 575         pa_hook_slot_free(u->source_output_put_slot);
 576     if (u->source_output_move_finish_slot)
 577         pa_hook_slot_free(u->source_output_move_finish_slot);
 578     if (u->source_output_proplist_slot)
 579         pa_hook_slot_free(u->source_output_proplist_slot);
 580     if (u->source_output_unlink_slot)
 581         pa_hook_slot_free(u->source_output_unlink_slot);
 582     if (u->source_unlink_slot)
 583         pa_hook_slot_free(u->source_unlink_slot);
 584
 585     if (u->housekeeping_time_event)
 586         u->core->mainloop->time_free(u->housekeeping_time_event);
 587
 588     if (u->filters) {
 589         struct filter *f;
 590
 591         while ((f = pa_hashmap_steal_first(u->filters))) {
 592             pa_module_unload_request_by_index(u->core, f->module_index, TRUE);
 593             filter_free(f);
 594         }
 595
 596         pa_hashmap_free(u->filters, NULL, NULL);
 597     }
 598
 599     pa_xfree(u);
 600 }