code.delx.au - pulseaudio/blob - src/modules/module-stream-restore.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2008 Lennart Poettering
   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 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 <unistd.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <ctype.h>
  33 #include <gdbm.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulse/volume.h>
  37 #include <pulse/timeval.h>
  38 #include <pulse/util.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/core-subscribe.h>
  46 #include <pulsecore/sink-input.h>
  47 #include <pulsecore/source-output.h>
  48 #include <pulsecore/namereg.h>
  49 #include <pulsecore/protocol-native.h>
  50 #include <pulsecore/pstream.h>
  51 #include <pulsecore/pstream-util.h>
  52
  53 #include "module-stream-restore-symdef.h"
  54
  55 PA_MODULE_AUTHOR("Lennart Poettering");
  56 PA_MODULE_DESCRIPTION("Automatically restore the volume/mute/device state of streams");
  57 PA_MODULE_VERSION(PACKAGE_VERSION);
  58 PA_MODULE_LOAD_ONCE(TRUE);
  59 PA_MODULE_USAGE(
  60         "restore_device=<Save/restore sinks/sources?> "
  61         "restore_volume=<Save/restore volumes?> "
  62         "restore_muted=<Save/restore muted states?>");
  63
  64 #define SAVE_INTERVAL 10
  65
  66 static const char* const valid_modargs[] = {
  67     "restore_device",
  68     "restore_volume",
  69     "restore_muted",
  70     NULL
  71 };
  72
  73 struct userdata {
  74     pa_core *core;
  75     pa_module *module;
  76     pa_subscription *subscription;
  77     pa_hook_slot
  78         *sink_input_new_hook_slot,
  79         *sink_input_fixate_hook_slot,
  80         *source_output_new_hook_slot,
  81         *connection_unlink_hook_slot;
  82     pa_time_event *save_time_event;
  83     GDBM_FILE gdbm_file;
  84
  85     pa_bool_t restore_device:1;
  86     pa_bool_t restore_volume:1;
  87     pa_bool_t restore_muted:1;
  88
  89     pa_native_protocol *protocol;
  90     pa_idxset *subscribed;
  91 };
  92
  93 #define ENTRY_VERSION 1
  94
  95 struct entry PA_GCC_PACKED {
  96     uint8_t version;
  97     pa_bool_t muted_valid:1, relative_volume_valid:1, absolute_volume_valid:1, device_valid:1;
  98     pa_bool_t muted:1;
  99     pa_channel_map channel_map;
 100     pa_cvolume relative_volume;
 101     pa_cvolume absolute_volume;
 102     char device[PA_NAME_MAX];
 103 };
 104
 105 enum {
 106     SUBCOMMAND_TEST,
 107     SUBCOMMAND_READ,
 108     SUBCOMMAND_WRITE,
 109     SUBCOMMAND_DELETE,
 110     SUBCOMMAND_SUBSCRIBE,
 111     SUBCOMMAND_EVENT
 112 };
 113
 114 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *tv, void *userdata) {
 115     struct userdata *u = userdata;
 116
 117     pa_assert(a);
 118     pa_assert(e);
 119     pa_assert(tv);
 120     pa_assert(u);
 121
 122     pa_assert(e == u->save_time_event);
 123     u->core->mainloop->time_free(u->save_time_event);
 124     u->save_time_event = NULL;
 125
 126     gdbm_sync(u->gdbm_file);
 127     pa_log_info("Synced.");
 128 }
 129
 130 static char *get_name(pa_proplist *p, const char *prefix) {
 131     const char *r;
 132
 133     if (!p)
 134         return NULL;
 135
 136     if ((r = pa_proplist_gets(p, PA_PROP_MEDIA_ROLE)))
 137         return pa_sprintf_malloc("%s-by-media-role:%s", prefix, r);
 138     else if ((r = pa_proplist_gets(p, PA_PROP_APPLICATION_ID)))
 139         return pa_sprintf_malloc("%s-by-application-id:%s", prefix, r);
 140     else if ((r = pa_proplist_gets(p, PA_PROP_APPLICATION_NAME)))
 141         return pa_sprintf_malloc("%s-by-application-name:%s", prefix, r);
 142     else if ((r = pa_proplist_gets(p, PA_PROP_MEDIA_NAME)))
 143         return pa_sprintf_malloc("%s-by-media-name:%s", prefix, r);
 144
 145     return pa_sprintf_malloc("%s-fallback:%s", prefix, r);
 146 }
 147
 148 static struct entry* read_entry(struct userdata *u, const char *name) {
 149     datum key, data;
 150     struct entry *e;
 151
 152     pa_assert(u);
 153     pa_assert(name);
 154
 155     key.dptr = (char*) name;
 156     key.dsize = (int) strlen(name);
 157
 158     data = gdbm_fetch(u->gdbm_file, key);
 159
 160     if (!data.dptr)
 161         goto fail;
 162
 163     if (data.dsize != sizeof(struct entry)) {
 164         /* This is probably just a database upgrade, hence let's not
 165          * consider this more than a debug message */
 166         pa_log_debug("Database contains entry for stream %s of wrong size %lu != %lu. Probably due to uprade, ignoring.", name, (unsigned long) data.dsize, (unsigned long) sizeof(struct entry));
 167         goto fail;
 168     }
 169
 170     e = (struct entry*) data.dptr;
 171
 172     if (e->version != ENTRY_VERSION) {
 173         pa_log_debug("Version of database entry for stream %s doesn't match our version. Probably due to upgrade, ignoring.", name);
 174         goto fail;
 175     }
 176
 177     if (!memchr(e->device, 0, sizeof(e->device))) {
 178         pa_log_warn("Database contains entry for stream %s with missing NUL byte in device name", name);
 179         goto fail;
 180     }
 181
 182     if (e->device_valid && !pa_namereg_is_valid_name(e->device)) {
 183         pa_log_warn("Invalid device name stored in database for stream %s", name);
 184         goto fail;
 185     }
 186
 187     if ((e->relative_volume_valid || e->absolute_volume_valid) && !(pa_channel_map_valid(&e->channel_map))) {
 188         pa_log_warn("Invalid channel map stored in database for stream %s", name);
 189         goto fail;
 190     }
 191
 192     if ((e->relative_volume_valid && (!pa_cvolume_valid(&e->relative_volume) || e->relative_volume.channels != e->channel_map.channels)) ||
 193         (e->absolute_volume_valid && (!pa_cvolume_valid(&e->absolute_volume) || e->absolute_volume.channels != e->channel_map.channels))) {
 194         pa_log_warn("Invalid volume stored in database for stream %s", name);
 195         goto fail;
 196     }
 197
 198     return e;
 199
 200 fail:
 201
 202     pa_xfree(data.dptr);
 203     return NULL;
 204 }
 205
 206 static void trigger_save(struct userdata *u) {
 207     struct timeval tv;
 208     pa_native_connection *c;
 209     uint32_t idx;
 210
 211     for (c = pa_idxset_first(u->subscribed, &idx); c; c = pa_idxset_next(u->subscribed, &idx)) {
 212         pa_tagstruct *t;
 213
 214         t = pa_tagstruct_new(NULL, 0);
 215         pa_tagstruct_putu32(t, PA_COMMAND_EXTENSION);
 216         pa_tagstruct_putu32(t, 0);
 217         pa_tagstruct_putu32(t, u->module->index);
 218         pa_tagstruct_puts(t, u->module->name);
 219         pa_tagstruct_putu32(t, SUBCOMMAND_EVENT);
 220
 221         pa_pstream_send_tagstruct(pa_native_connection_get_pstream(c), t);
 222     }
 223
 224     if (u->save_time_event)
 225         return;
 226
 227     pa_gettimeofday(&tv);
 228     tv.tv_sec += SAVE_INTERVAL;
 229     u->save_time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, save_time_callback, u);
 230 }
 231
 232 static pa_bool_t entries_equal(const struct entry *a, const struct entry *b) {
 233     pa_cvolume t;
 234
 235     pa_assert(a);
 236     pa_assert(b);
 237
 238     if (a->device_valid != b->device_valid ||
 239         (a->device_valid && strncmp(a->device, b->device, sizeof(a->device))))
 240         return FALSE;
 241
 242     if (a->muted_valid != b->muted_valid ||
 243         (a->muted && (a->muted != b->muted)))
 244         return FALSE;
 245
 246     t = b->relative_volume;
 247     if (a->relative_volume_valid != b->relative_volume_valid ||
 248         (a->relative_volume_valid && !pa_cvolume_equal(pa_cvolume_remap(&t, &b->channel_map, &a->channel_map), &a->relative_volume)))
 249         return FALSE;
 250
 251     t = b->absolute_volume;
 252     if (a->absolute_volume_valid != b->absolute_volume_valid ||
 253         (a->absolute_volume_valid && !pa_cvolume_equal(pa_cvolume_remap(&t, &b->channel_map, &a->channel_map), &a->absolute_volume)))
 254         return FALSE;
 255
 256     return TRUE;
 257 }
 258
 259 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 260     struct userdata *u = userdata;
 261     struct entry entry, *old;
 262     char *name;
 263     datum key, data;
 264
 265     pa_assert(c);
 266     pa_assert(u);
 267
 268     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
 269         t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE) &&
 270         t != (PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
 271         t != (PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE))
 272         return;
 273
 274     memset(&entry, 0, sizeof(entry));
 275     entry.version = ENTRY_VERSION;
 276
 277     if ((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SINK_INPUT) {
 278         pa_sink_input *sink_input;
 279
 280         if (!(sink_input = pa_idxset_get_by_index(c->sink_inputs, idx)))
 281             return;
 282
 283         if (!(name = get_name(sink_input->proplist, "sink-input")))
 284             return;
 285
 286         entry.channel_map = sink_input->channel_map;
 287
 288         if (sink_input->sink->flags & PA_SINK_FLAT_VOLUME) {
 289             entry.absolute_volume = *pa_sink_input_get_volume(sink_input);
 290             entry.absolute_volume_valid = sink_input->save_volume;
 291
 292             pa_sw_cvolume_divide(&entry.relative_volume, &entry.absolute_volume, pa_sink_get_volume(sink_input->sink, FALSE));
 293             entry.relative_volume_valid = sink_input->save_volume;
 294         } else {
 295             entry.relative_volume = *pa_sink_input_get_volume(sink_input);
 296             entry.relative_volume_valid = sink_input->save_volume;
 297         }
 298
 299         entry.muted = pa_sink_input_get_mute(sink_input);
 300         entry.muted_valid = sink_input->save_muted;
 301
 302         pa_strlcpy(entry.device, sink_input->sink->name, sizeof(entry.device));
 303         entry.device_valid = sink_input->save_sink;
 304
 305     } else {
 306         pa_source_output *source_output;
 307
 308         pa_assert((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT);
 309
 310         if (!(source_output = pa_idxset_get_by_index(c->source_outputs, idx)))
 311             return;
 312
 313         if (!(name = get_name(source_output->proplist, "source-output")))
 314             return;
 315
 316         entry.channel_map = source_output->channel_map;
 317
 318         pa_strlcpy(entry.device, source_output->source->name, sizeof(entry.device));
 319         entry.device_valid = source_output->save_source;
 320     }
 321
 322     if ((old = read_entry(u, name))) {
 323
 324         if (entries_equal(old, &entry)) {
 325             pa_xfree(old);
 326             pa_xfree(name);
 327             return;
 328         }
 329
 330         pa_xfree(old);
 331     }
 332
 333     key.dptr = name;
 334     key.dsize = (int) strlen(name);
 335
 336     data.dptr = (void*) &entry;
 337     data.dsize = sizeof(entry);
 338
 339     pa_log_info("Storing volume/mute/device for stream %s.", name);
 340
 341     gdbm_store(u->gdbm_file, key, data, GDBM_REPLACE);
 342
 343     pa_xfree(name);
 344
 345     trigger_save(u);
 346 }
 347
 348 static pa_hook_result_t sink_input_new_hook_callback(pa_core *c, pa_sink_input_new_data *new_data, struct userdata *u) {
 349     char *name;
 350     struct entry *e;
 351
 352     pa_assert(new_data);
 353
 354     if (!u->restore_device)
 355         return PA_HOOK_OK;
 356
 357     if (!(name = get_name(new_data->proplist, "sink-input")))
 358         return PA_HOOK_OK;
 359
 360     if ((e = read_entry(u, name))) {
 361         pa_sink *s;
 362
 363         if (e->device_valid) {
 364
 365             if ((s = pa_namereg_get(c, e->device, PA_NAMEREG_SINK))) {
 366                 if (!new_data->sink) {
 367                     pa_log_info("Restoring device for stream %s.", name);
 368                     new_data->sink = s;
 369                     new_data->save_sink = TRUE;
 370                 } else
 371                     pa_log_info("Not restore device for stream %s, because already set.", name);
 372             }
 373         }
 374
 375         pa_xfree(e);
 376     }
 377
 378     pa_xfree(name);
 379
 380     return PA_HOOK_OK;
 381 }
 382
 383 static pa_hook_result_t sink_input_fixate_hook_callback(pa_core *c, pa_sink_input_new_data *new_data, struct userdata *u) {
 384     char *name;
 385     struct entry *e;
 386
 387     pa_assert(new_data);
 388
 389     if (!u->restore_volume && !u->restore_muted)
 390         return PA_HOOK_OK;
 391
 392     if (!(name = get_name(new_data->proplist, "sink-input")))
 393         return PA_HOOK_OK;
 394
 395     if ((e = read_entry(u, name))) {
 396
 397         if (u->restore_volume) {
 398
 399             if (!new_data->virtual_volume_is_set) {
 400                 pa_cvolume v;
 401                 pa_cvolume_init(&v);
 402
 403                 if (new_data->sink->flags & PA_SINK_FLAT_VOLUME) {
 404
 405                     if (e->absolute_volume_valid &&
 406                         e->device_valid &&
 407                         pa_streq(new_data->sink->name, e->device)) {
 408
 409                         v = e->absolute_volume;
 410                         new_data->virtual_volume_is_absolute = TRUE;
 411                     } else if (e->relative_volume_valid) {
 412
 413                         v = e->relative_volume;
 414                         new_data->virtual_volume_is_absolute = FALSE;
 415                     }
 416
 417                 } else if (e->relative_volume_valid) {
 418                     v = e->relative_volume;
 419                     new_data->virtual_volume_is_absolute = FALSE;
 420                 }
 421
 422                 if (v.channels > 0) {
 423                     pa_log_info("Restoring volume for sink input %s.", name);
 424                     pa_sink_input_new_data_set_virtual_volume(new_data, pa_cvolume_remap(&v, &e->channel_map, &new_data->channel_map));
 425                     new_data->save_volume = TRUE;
 426                 }
 427             } else
 428                 pa_log_debug("Not restoring volume for sink input %s, because already set.", name);
 429         }
 430
 431         if (u->restore_muted && e->muted_valid) {
 432             if (!new_data->muted_is_set) {
 433                 pa_log_info("Restoring mute state for sink input %s.", name);
 434                 pa_sink_input_new_data_set_muted(new_data, e->muted);
 435                 new_data->save_muted = TRUE;
 436             } else
 437                 pa_log_debug("Not restoring mute state for sink input %s, because already set.", name);
 438         }
 439
 440         pa_xfree(e);
 441     }
 442
 443     pa_xfree(name);
 444
 445     return PA_HOOK_OK;
 446 }
 447
 448 static pa_hook_result_t source_output_new_hook_callback(pa_core *c, pa_source_output_new_data *new_data, struct userdata *u) {
 449     char *name;
 450     struct entry *e;
 451
 452     pa_assert(new_data);
 453
 454     if (!u->restore_device)
 455         return PA_HOOK_OK;
 456
 457     if (new_data->direct_on_input)
 458         return PA_HOOK_OK;
 459
 460     if (!(name = get_name(new_data->proplist, "source-output")))
 461         return PA_HOOK_OK;
 462
 463     if ((e = read_entry(u, name))) {
 464         pa_source *s;
 465
 466         if (e->device_valid) {
 467             if ((s = pa_namereg_get(c, e->device, PA_NAMEREG_SOURCE))) {
 468                 if (!new_data->source) {
 469                     pa_log_info("Restoring device for stream %s.", name);
 470                     new_data->source = s;
 471                     new_data->save_source = TRUE;
 472                 } else
 473                     pa_log_info("Not restoring device for stream %s, because already set", name);
 474             }
 475         }
 476
 477         pa_xfree(e);
 478     }
 479
 480     pa_xfree(name);
 481
 482     return PA_HOOK_OK;
 483 }
 484
 485 #define EXT_VERSION 1
 486
 487 static void clear_db(struct userdata *u) {
 488     datum key;
 489
 490     pa_assert(u);
 491
 492     key = gdbm_firstkey(u->gdbm_file);
 493     while (key.dptr) {
 494         datum next_key;
 495         next_key = gdbm_nextkey(u->gdbm_file, key);
 496
 497         gdbm_delete(u->gdbm_file, key);
 498         pa_xfree(key.dptr);
 499
 500         key = next_key;
 501     }
 502
 503     gdbm_reorganize(u->gdbm_file);
 504 }
 505
 506 static void apply_entry(struct userdata *u, const char *name, struct entry *e) {
 507     pa_sink_input *si;
 508     pa_source_output *so;
 509     uint32_t idx;
 510
 511     pa_assert(u);
 512     pa_assert(name);
 513     pa_assert(e);
 514
 515     for (si = pa_idxset_first(u->core->sink_inputs, &idx); si; si = pa_idxset_next(u->core->sink_inputs, &idx)) {
 516         char *n;
 517         pa_sink *s;
 518
 519         if (!(n = get_name(si->proplist, "sink-input")))
 520             continue;
 521
 522         if (strcmp(name, n)) {
 523             pa_xfree(n);
 524             continue;
 525         }
 526
 527         if (u->restore_volume) {
 528             pa_cvolume v;
 529             pa_cvolume_init(&v);
 530
 531             if (si->sink->flags & PA_SINK_FLAT_VOLUME) {
 532
 533                 if (e->absolute_volume_valid &&
 534                     e->device_valid &&
 535                     pa_streq(e->device, si->sink->name))
 536                     v = e->absolute_volume;
 537                 else if (e->relative_volume_valid) {
 538                     pa_cvolume t = si->sink->virtual_volume;
 539                     pa_sw_cvolume_multiply(&v, &e->relative_volume, pa_cvolume_remap(&t, &si->sink->channel_map, &e->channel_map));
 540                 }
 541             } else if (e->relative_volume_valid)
 542                 v = e->relative_volume;
 543
 544             if (v.channels > 0) {
 545                 pa_log_info("Restoring volume for sink input %s.", name);
 546                 pa_sink_input_set_volume(si, pa_cvolume_remap(&v, &e->channel_map, &si->channel_map), TRUE);
 547             }
 548         }
 549
 550         if (u->restore_muted &&
 551             e->muted_valid) {
 552             pa_log_info("Restoring mute state for sink input %s.", name);
 553             pa_sink_input_set_mute(si, e->muted, TRUE);
 554         }
 555
 556         if (u->restore_device &&
 557             e->device_valid &&
 558             (s = pa_namereg_get(u->core, e->device, PA_NAMEREG_SINK))) {
 559
 560             pa_log_info("Restoring device for stream %s.", name);
 561             pa_sink_input_move_to(si, s, TRUE);
 562         }
 563     }
 564
 565     for (so = pa_idxset_first(u->core->source_outputs, &idx); so; so = pa_idxset_next(u->core->source_outputs, &idx)) {
 566         char *n;
 567         pa_source *s;
 568
 569         if (!(n = get_name(so->proplist, "source-output")))
 570             continue;
 571
 572         if (strcmp(name, n)) {
 573             pa_xfree(n);
 574             continue;
 575         }
 576
 577         if (u->restore_device &&
 578             e->device_valid &&
 579             (s = pa_namereg_get(u->core, e->device, PA_NAMEREG_SOURCE))) {
 580
 581             pa_log_info("Restoring device for stream %s.", name);
 582             pa_source_output_move_to(so, s, TRUE);
 583         }
 584     }
 585 }
 586
 587 #if 0
 588 static void dump_database(struct userdata *u) {
 589     datum key;
 590
 591     key = gdbm_firstkey(u->gdbm_file);
 592     while (key.dptr) {
 593         datum next_key;
 594         struct entry *e;
 595         char *name;
 596
 597         next_key = gdbm_nextkey(u->gdbm_file, key);
 598
 599         name = pa_xstrndup(key.dptr, key.dsize);
 600         pa_xfree(key.dptr);
 601
 602         if ((e = read_entry(u, name))) {
 603             char t[256];
 604             pa_log("name=%s", name);
 605             pa_log("device=%s", e->device);
 606             pa_log("channel_map=%s", pa_channel_map_snprint(t, sizeof(t), &e->channel_map));
 607             pa_log("volume=%s", pa_cvolume_snprint(t, sizeof(t), &e->volume));
 608             pa_log("mute=%s", pa_yes_no(e->muted));
 609             pa_xfree(e);
 610         }
 611
 612         pa_xfree(name);
 613
 614         key = next_key;
 615     }
 616 }
 617 #endif
 618
 619 static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connection *c, uint32_t tag, pa_tagstruct *t) {
 620     struct userdata *u;
 621     uint32_t command;
 622     pa_tagstruct *reply = NULL;
 623
 624     pa_assert(p);
 625     pa_assert(m);
 626     pa_assert(c);
 627     pa_assert(t);
 628
 629     u = m->userdata;
 630
 631     if (pa_tagstruct_getu32(t, &command) < 0)
 632         goto fail;
 633
 634     reply = pa_tagstruct_new(NULL, 0);
 635     pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
 636     pa_tagstruct_putu32(reply, tag);
 637
 638     switch (command) {
 639         case SUBCOMMAND_TEST: {
 640             if (!pa_tagstruct_eof(t))
 641                 goto fail;
 642
 643             pa_tagstruct_putu32(reply, EXT_VERSION);
 644             break;
 645         }
 646
 647         case SUBCOMMAND_READ: {
 648             datum key;
 649
 650             if (!pa_tagstruct_eof(t))
 651                 goto fail;
 652
 653             key = gdbm_firstkey(u->gdbm_file);
 654             while (key.dptr) {
 655                 datum next_key;
 656                 struct entry *e;
 657                 char *name;
 658
 659                 next_key = gdbm_nextkey(u->gdbm_file, key);
 660
 661                 name = pa_xstrndup(key.dptr, (size_t) key.dsize);
 662                 pa_xfree(key.dptr);
 663
 664                 if ((e = read_entry(u, name))) {
 665                     pa_cvolume r;
 666
 667                     pa_tagstruct_puts(reply, name);
 668                     pa_tagstruct_put_channel_map(reply, &e->channel_map);
 669                     pa_tagstruct_put_cvolume(reply, e->relative_volume_valid ? &e->relative_volume : pa_cvolume_init(&r));
 670                     pa_tagstruct_puts(reply, e->device_valid ? e->device : NULL);
 671                     pa_tagstruct_put_boolean(reply, e->muted_valid ? e->muted : FALSE);
 672
 673                     pa_xfree(e);
 674                 }
 675
 676                 pa_xfree(name);
 677
 678                 key = next_key;
 679             }
 680
 681             break;
 682         }
 683
 684         case SUBCOMMAND_WRITE: {
 685             uint32_t mode;
 686             pa_bool_t apply_immediately = FALSE;
 687
 688             if (pa_tagstruct_getu32(t, &mode) < 0 ||
 689                 pa_tagstruct_get_boolean(t, &apply_immediately) < 0)
 690                 goto fail;
 691
 692             if (mode != PA_UPDATE_MERGE &&
 693                 mode != PA_UPDATE_REPLACE &&
 694                 mode != PA_UPDATE_SET)
 695                 goto fail;
 696
 697             if (mode == PA_UPDATE_SET)
 698                 clear_db(u);
 699
 700             while (!pa_tagstruct_eof(t)) {
 701                 const char *name, *device;
 702                 pa_bool_t muted;
 703                 struct entry entry;
 704                 datum key, data;
 705                 int k;
 706
 707                 memset(&entry, 0, sizeof(entry));
 708                 entry.version = ENTRY_VERSION;
 709
 710                 if (pa_tagstruct_gets(t, &name) < 0 ||
 711                     pa_tagstruct_get_channel_map(t, &entry.channel_map) ||
 712                     pa_tagstruct_get_cvolume(t, &entry.relative_volume) < 0 ||
 713                     pa_tagstruct_gets(t, &device) < 0 ||
 714                     pa_tagstruct_get_boolean(t, &muted) < 0)
 715                     goto fail;
 716
 717                 entry.absolute_volume_valid = FALSE;
 718                 entry.relative_volume_valid = entry.relative_volume.channels > 0;
 719
 720                 if (entry.relative_volume_valid &&
 721                     entry.channel_map.channels != entry.relative_volume.channels)
 722                     goto fail;
 723
 724                 entry.muted = muted;
 725                 entry.muted_valid = TRUE;
 726
 727                 if (device)
 728                     pa_strlcpy(entry.device, device, sizeof(entry.device));
 729                 entry.device_valid = !!entry.device[0];
 730
 731                 if (entry.device_valid &&
 732                     !pa_namereg_is_valid_name(entry.device))
 733                     goto fail;
 734
 735                 key.dptr = (void*) name;
 736                 key.dsize = (int) strlen(name);
 737
 738                 data.dptr = (void*) &entry;
 739                 data.dsize = sizeof(entry);
 740
 741                 if ((k = gdbm_store(u->gdbm_file, key, data, mode == PA_UPDATE_REPLACE ? GDBM_REPLACE : GDBM_INSERT)) == 0)
 742                     if (apply_immediately)
 743                         apply_entry(u, name, &entry);
 744             }
 745
 746             trigger_save(u);
 747
 748             break;
 749         }
 750
 751         case SUBCOMMAND_DELETE:
 752
 753             while (!pa_tagstruct_eof(t)) {
 754                 const char *name;
 755                 datum key;
 756
 757                 if (pa_tagstruct_gets(t, &name) < 0)
 758                     goto fail;
 759
 760                 key.dptr = (void*) name;
 761                 key.dsize = (int) strlen(name);
 762
 763                 gdbm_delete(u->gdbm_file, key);
 764             }
 765
 766             trigger_save(u);
 767
 768             break;
 769
 770         case SUBCOMMAND_SUBSCRIBE: {
 771
 772             pa_bool_t enabled;
 773
 774             if (pa_tagstruct_get_boolean(t, &enabled) < 0 ||
 775                 !pa_tagstruct_eof(t))
 776                 goto fail;
 777
 778             if (enabled)
 779                 pa_idxset_put(u->subscribed, c, NULL);
 780             else
 781                 pa_idxset_remove_by_data(u->subscribed, c, NULL);
 782
 783             break;
 784         }
 785
 786         default:
 787             goto fail;
 788     }
 789
 790     pa_pstream_send_tagstruct(pa_native_connection_get_pstream(c), reply);
 791     return 0;
 792
 793 fail:
 794
 795     if (reply)
 796         pa_tagstruct_free(reply);
 797
 798     return -1;
 799 }
 800
 801 static pa_hook_result_t connection_unlink_hook_cb(pa_native_protocol *p, pa_native_connection *c, struct userdata *u) {
 802     pa_assert(p);
 803     pa_assert(c);
 804     pa_assert(u);
 805
 806     pa_idxset_remove_by_data(u->subscribed, c, NULL);
 807     return PA_HOOK_OK;
 808 }
 809
 810 int pa__init(pa_module*m) {
 811     pa_modargs *ma = NULL;
 812     struct userdata *u;
 813     char *fname, *fn;
 814     pa_sink_input *si;
 815     pa_source_output *so;
 816     uint32_t idx;
 817     pa_bool_t restore_device = TRUE, restore_volume = TRUE, restore_muted = TRUE;
 818     int gdbm_cache_size;
 819
 820     pa_assert(m);
 821
 822     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 823         pa_log("Failed to parse module arguments");
 824         goto fail;
 825     }
 826
 827     if (pa_modargs_get_value_boolean(ma, "restore_device", &restore_device) < 0 ||
 828         pa_modargs_get_value_boolean(ma, "restore_volume", &restore_volume) < 0 ||
 829         pa_modargs_get_value_boolean(ma, "restore_muted", &restore_muted) < 0) {
 830         pa_log("restore_device=, restore_volume= and restore_muted= expect boolean arguments");
 831         goto fail;
 832     }
 833
 834     if (!restore_muted && !restore_volume && !restore_device)
 835         pa_log_warn("Neither restoring volume, nor restoring muted, nor restoring device enabled!");
 836
 837     m->userdata = u = pa_xnew(struct userdata, 1);
 838     u->core = m->core;
 839     u->module = m;
 840     u->save_time_event = NULL;
 841     u->restore_device = restore_device;
 842     u->restore_volume = restore_volume;
 843     u->restore_muted = restore_muted;
 844     u->gdbm_file = NULL;
 845     u->subscribed = pa_idxset_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 846
 847     u->protocol = pa_native_protocol_get(m->core);
 848     pa_native_protocol_install_ext(u->protocol, m, extension_cb);
 849
 850     u->connection_unlink_hook_slot = pa_hook_connect(&pa_native_protocol_hooks(u->protocol)[PA_NATIVE_HOOK_CONNECTION_UNLINK], PA_HOOK_NORMAL, (pa_hook_cb_t) connection_unlink_hook_cb, u);
 851
 852     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_SINK_INPUT|PA_SUBSCRIPTION_MASK_SOURCE_OUTPUT, subscribe_callback, u);
 853
 854     if (restore_device) {
 855         u->sink_input_new_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) sink_input_new_hook_callback, u);
 856         u->source_output_new_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) source_output_new_hook_callback, u);
 857     }
 858
 859     if (restore_volume || restore_muted)
 860         u->sink_input_fixate_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], PA_HOOK_EARLY, (pa_hook_cb_t) sink_input_fixate_hook_callback, u);
 861
 862     /* We include the host identifier in the file name because gdbm
 863      * files are CPU dependant, and we don't want things to go wrong
 864      * if we are on a multiarch system. */
 865
 866     fn = pa_sprintf_malloc("stream-volumes."CANONICAL_HOST".gdbm");
 867     fname = pa_state_path(fn, TRUE);
 868     pa_xfree(fn);
 869
 870     if (!fname)
 871         goto fail;
 872
 873     if (!(u->gdbm_file = gdbm_open(fname, 0, GDBM_WRCREAT|GDBM_NOLOCK, 0600, NULL))) {
 874         pa_log("Failed to open volume database '%s': %s", fname, gdbm_strerror(gdbm_errno));
 875         pa_xfree(fname);
 876         goto fail;
 877     }
 878
 879     /* By default the cache of gdbm is rather large, let's reduce it a bit to save memory */
 880     gdbm_cache_size = 10;
 881     gdbm_setopt(u->gdbm_file, GDBM_CACHESIZE, &gdbm_cache_size, sizeof(gdbm_cache_size));
 882
 883     pa_log_info("Sucessfully opened database file '%s'.", fname);
 884     pa_xfree(fname);
 885
 886     for (si = pa_idxset_first(m->core->sink_inputs, &idx); si; si = pa_idxset_next(m->core->sink_inputs, &idx))
 887         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW, si->index, u);
 888
 889     for (so = pa_idxset_first(m->core->source_outputs, &idx); so; so = pa_idxset_next(m->core->source_outputs, &idx))
 890         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW, so->index, u);
 891
 892     pa_modargs_free(ma);
 893     return 0;
 894
 895 fail:
 896     pa__done(m);
 897
 898     if (ma)
 899         pa_modargs_free(ma);
 900
 901     return  -1;
 902 }
 903
 904 void pa__done(pa_module*m) {
 905     struct userdata* u;
 906
 907     pa_assert(m);
 908
 909     if (!(u = m->userdata))
 910         return;
 911
 912     if (u->subscription)
 913         pa_subscription_free(u->subscription);
 914
 915     if (u->sink_input_new_hook_slot)
 916         pa_hook_slot_free(u->sink_input_new_hook_slot);
 917     if (u->sink_input_fixate_hook_slot)
 918         pa_hook_slot_free(u->sink_input_fixate_hook_slot);
 919     if (u->source_output_new_hook_slot)
 920         pa_hook_slot_free(u->source_output_new_hook_slot);
 921
 922     if (u->connection_unlink_hook_slot)
 923         pa_hook_slot_free(u->connection_unlink_hook_slot);
 924
 925     if (u->save_time_event)
 926         u->core->mainloop->time_free(u->save_time_event);
 927
 928     if (u->gdbm_file)
 929         gdbm_close(u->gdbm_file);
 930
 931     if (u->protocol) {
 932         pa_native_protocol_remove_ext(u->protocol, m);
 933         pa_native_protocol_unref(u->protocol);
 934     }
 935
 936     if (u->subscribed)
 937         pa_idxset_free(u->subscribed, NULL, NULL);
 938
 939     pa_xfree(u);
 940 }