code.delx.au - pulseaudio/blob - src/modules/module-device-manager.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006-2008 Lennart Poettering
   5   Copyright 2009 Colin Guthrie
   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 2.1 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 <unistd.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <ctype.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulse/volume.h>
  37 #include <pulse/timeval.h>
  38 #include <pulse/util.h>
  39 #include <pulse/rtclock.h>
  40
  41 #include <pulsecore/core-error.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/log.h>
  46 #include <pulsecore/core-subscribe.h>
  47 #include <pulsecore/sink-input.h>
  48 #include <pulsecore/source-output.h>
  49 #include <pulsecore/namereg.h>
  50 #include <pulsecore/protocol-native.h>
  51 #include <pulsecore/pstream.h>
  52 #include <pulsecore/pstream-util.h>
  53 #include <pulsecore/database.h>
  54
  55 #include "module-device-manager-symdef.h"
  56
  57 PA_MODULE_AUTHOR("Colin Guthrie");
  58 PA_MODULE_DESCRIPTION("Keep track of devices (and their descriptions) both past and present");
  59 PA_MODULE_VERSION(PACKAGE_VERSION);
  60 PA_MODULE_LOAD_ONCE(TRUE);
  61 PA_MODULE_USAGE("This module does not take any arguments");
  62
  63 #define SAVE_INTERVAL (10 * PA_USEC_PER_SEC)
  64
  65 static const char* const valid_modargs[] = {
  66     NULL
  67 };
  68
  69 struct userdata {
  70     pa_core *core;
  71     pa_module *module;
  72     pa_subscription *subscription;
  73     pa_hook_slot
  74         *sink_new_hook_slot,
  75         *source_new_hook_slot,
  76         *connection_unlink_hook_slot;
  77     pa_time_event *save_time_event;
  78     pa_database *database;
  79
  80     pa_native_protocol *protocol;
  81     pa_idxset *subscribed;
  82 };
  83
  84 #define ENTRY_VERSION 1
  85
  86 struct entry {
  87     uint8_t version;
  88     char description[PA_NAME_MAX];
  89 } PA_GCC_PACKED;
  90
  91 enum {
  92     SUBCOMMAND_TEST,
  93     SUBCOMMAND_READ,
  94     SUBCOMMAND_WRITE,
  95     SUBCOMMAND_DELETE,
  96     SUBCOMMAND_SUBSCRIBE,
  97     SUBCOMMAND_EVENT
  98 };
  99
 100 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *t, void *userdata) {
 101     struct userdata *u = userdata;
 102
 103     pa_assert(a);
 104     pa_assert(e);
 105     pa_assert(u);
 106
 107     pa_assert(e == u->save_time_event);
 108     u->core->mainloop->time_free(u->save_time_event);
 109     u->save_time_event = NULL;
 110
 111     pa_database_sync(u->database);
 112     pa_log_info("Synced.");
 113 }
 114
 115 static struct entry* read_entry(struct userdata *u, const char *name) {
 116     pa_datum key, data;
 117     struct entry *e;
 118
 119     pa_assert(u);
 120     pa_assert(name);
 121
 122     key.data = (char*) name;
 123     key.size = strlen(name);
 124
 125     pa_zero(data);
 126
 127     if (!pa_database_get(u->database, &key, &data))
 128         goto fail;
 129
 130     if (data.size != sizeof(struct entry)) {
 131         pa_log_debug("Database contains entry for device %s of wrong size %lu != %lu. Probably due to upgrade, ignoring.", name, (unsigned long) data.size, (unsigned long) sizeof(struct entry));
 132         goto fail;
 133     }
 134
 135     e = (struct entry*) data.data;
 136
 137     if (e->version != ENTRY_VERSION) {
 138         pa_log_debug("Version of database entry for device %s doesn't match our version. Probably due to upgrade, ignoring.", name);
 139         goto fail;
 140     }
 141
 142     if (!memchr(e->description, 0, sizeof(e->description))) {
 143         pa_log_warn("Database contains entry for device %s with missing NUL byte in description", name);
 144         goto fail;
 145     }
 146
 147     return e;
 148
 149 fail:
 150
 151     pa_datum_free(&data);
 152     return NULL;
 153 }
 154
 155 static void trigger_save(struct userdata *u) {
 156     if (u->save_time_event)
 157         return;
 158
 159     u->save_time_event = pa_core_rttime_new(u->core, pa_rtclock_now() + SAVE_INTERVAL, save_time_callback, u);
 160 }
 161
 162 static pa_bool_t entries_equal(const struct entry *a, const struct entry *b) {
 163     if (strncmp(a->description, b->description, sizeof(a->description)))
 164         return FALSE;
 165
 166     return TRUE;
 167 }
 168
 169 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 170     struct userdata *u = userdata;
 171     struct entry entry, *old;
 172     char *name;
 173     pa_datum key, data;
 174
 175     pa_assert(c);
 176     pa_assert(u);
 177
 178     if (t != (PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_NEW) &&
 179         t != (PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE) &&
 180         t != (PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_NEW) &&
 181         t != (PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE))
 182         return;
 183
 184     pa_zero(entry);
 185     entry.version = ENTRY_VERSION;
 186
 187     if ((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SINK) {
 188         pa_sink *sink;
 189
 190         if (!(sink = pa_idxset_get_by_index(c->sinks, idx)))
 191             return;
 192
 193         name = pa_sprintf_malloc("sink:%s", sink->name);
 194
 195         if ((old = read_entry(u, name)))
 196             entry = *old;
 197
 198         pa_strlcpy(entry.description, pa_strnull(pa_proplist_gets(sink->proplist, PA_PROP_DEVICE_DESCRIPTION)), sizeof(entry.description));
 199
 200     } else {
 201         pa_source *source;
 202
 203         pa_assert((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SOURCE);
 204
 205         if (!(source = pa_idxset_get_by_index(c->sources, idx)))
 206             return;
 207
 208         name = pa_sprintf_malloc("source:%s", source->name);
 209
 210         if ((old = read_entry(u, name)))
 211             entry = *old;
 212
 213         pa_strlcpy(entry.description, pa_strnull(pa_proplist_gets(source->proplist, PA_PROP_DEVICE_DESCRIPTION)), sizeof(entry.description));
 214     }
 215
 216     if (old) {
 217
 218         if (entries_equal(old, &entry)) {
 219             pa_xfree(old);
 220             pa_xfree(name);
 221             return;
 222         }
 223
 224         pa_xfree(old);
 225     }
 226
 227     key.data = name;
 228     key.size = strlen(name);
 229
 230     data.data = &entry;
 231     data.size = sizeof(entry);
 232
 233     pa_log_info("Storing device description for %s.", name);
 234
 235     pa_database_set(u->database, &key, &data, TRUE);
 236
 237     pa_xfree(name);
 238
 239     trigger_save(u);
 240 }
 241
 242 static pa_hook_result_t sink_new_hook_callback(pa_core *c, pa_sink_new_data *new_data, struct userdata *u) {
 243     char *name;
 244     struct entry *e;
 245
 246     pa_assert(c);
 247     pa_assert(new_data);
 248     pa_assert(u);
 249
 250     name = pa_sprintf_malloc("sink:%s", new_data->name);
 251
 252     if ((e = read_entry(u, name))) {
 253         if (strncmp(e->description, pa_proplist_gets(new_data->proplist, PA_PROP_DEVICE_DESCRIPTION), sizeof(e->description)) != 0) {
 254             pa_log_info("Restoring description for sink %s.", name);
 255             pa_proplist_sets(new_data->proplist, PA_PROP_DEVICE_DESCRIPTION, e->description);
 256         }
 257
 258         pa_xfree(e);
 259     }
 260
 261     pa_xfree(name);
 262
 263     return PA_HOOK_OK;
 264 }
 265
 266 static pa_hook_result_t source_new_hook_callback(pa_core *c, pa_source_new_data *new_data, struct userdata *u) {
 267     char *name;
 268     struct entry *e;
 269
 270     pa_assert(c);
 271     pa_assert(new_data);
 272     pa_assert(u);
 273
 274     name = pa_sprintf_malloc("source:%s", new_data->name);
 275
 276     if ((e = read_entry(u, name))) {
 277
 278         if (strncmp(e->description, pa_proplist_gets(new_data->proplist, PA_PROP_DEVICE_DESCRIPTION), sizeof(e->description)) != 0) {
 279             pa_log_info("Restoring description for sink %s.", name);
 280             pa_proplist_sets(new_data->proplist, PA_PROP_DEVICE_DESCRIPTION, e->description);
 281         }
 282
 283         pa_xfree(e);
 284     }
 285
 286     pa_xfree(name);
 287
 288     return PA_HOOK_OK;
 289 }
 290
 291 static char *get_name(const char *key, const char *prefix) {
 292   char *t;
 293
 294   if (strncmp(key, prefix, sizeof(prefix)))
 295     return NULL;
 296
 297   t = pa_xstrdup(key + sizeof(prefix));
 298   return t;
 299 }
 300
 301 static void apply_entry(struct userdata *u, const char *name, struct entry *e) {
 302   pa_sink *sink;
 303   pa_source *source;
 304   uint32_t idx;
 305
 306   pa_assert(u);
 307   pa_assert(name);
 308   pa_assert(e);
 309
 310   for (sink = pa_idxset_first(u->core->sinks, &idx); sink; sink = pa_idxset_next(u->core->sinks, &idx)) {
 311     char *n;
 312
 313     if (!(n = get_name(name, "sink")))
 314       continue;
 315
 316     if (!pa_streq(sink->name, n)) {
 317       pa_xfree(n);
 318       continue;
 319     }
 320     pa_xfree(n);
 321
 322     pa_log_info("Restoring description for sink %s.", sink->name);
 323     pa_proplist_sets(sink->proplist, PA_PROP_DEVICE_DESCRIPTION, e->description);
 324   }
 325
 326   for (source = pa_idxset_first(u->core->sources, &idx); source; source = pa_idxset_next(u->core->sources, &idx)) {
 327     char *n;
 328
 329     if (!(n = get_name(name, "source")))
 330       continue;
 331
 332     if (!pa_streq(source->name, n)) {
 333       pa_xfree(n);
 334       continue;
 335     }
 336     pa_xfree(n);
 337
 338     pa_log_info("Restoring description for source %s.", source->name);
 339     pa_proplist_sets(source->proplist, PA_PROP_DEVICE_DESCRIPTION, e->description);
 340   }
 341 }
 342
 343 #define EXT_VERSION 1
 344
 345 static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connection *c, uint32_t tag, pa_tagstruct *t) {
 346   struct userdata *u;
 347   uint32_t command;
 348   pa_tagstruct *reply = NULL;
 349
 350   pa_assert(p);
 351   pa_assert(m);
 352   pa_assert(c);
 353   pa_assert(t);
 354
 355   u = m->userdata;
 356
 357   if (pa_tagstruct_getu32(t, &command) < 0)
 358     goto fail;
 359
 360   reply = pa_tagstruct_new(NULL, 0);
 361   pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
 362   pa_tagstruct_putu32(reply, tag);
 363
 364   switch (command) {
 365     case SUBCOMMAND_TEST: {
 366       if (!pa_tagstruct_eof(t))
 367         goto fail;
 368
 369       pa_tagstruct_putu32(reply, EXT_VERSION);
 370       break;
 371     }
 372
 373     case SUBCOMMAND_READ: {
 374       pa_datum key;
 375       pa_bool_t done;
 376
 377       if (!pa_tagstruct_eof(t))
 378         goto fail;
 379
 380       done = !pa_database_first(u->database, &key, NULL);
 381
 382       while (!done) {
 383         pa_datum next_key;
 384         struct entry *e;
 385         char *name;
 386
 387         done = !pa_database_next(u->database, &key, &next_key, NULL);
 388
 389         name = pa_xstrndup(key.data, key.size);
 390         pa_datum_free(&key);
 391
 392         if ((e = read_entry(u, name))) {
 393           pa_tagstruct_puts(reply, name);
 394           pa_tagstruct_puts(reply, e->description);
 395
 396           pa_xfree(e);
 397         }
 398
 399         pa_xfree(name);
 400
 401         key = next_key;
 402       }
 403
 404       break;
 405     }
 406
 407     case SUBCOMMAND_WRITE: {
 408       uint32_t mode;
 409       pa_bool_t apply_immediately = FALSE;
 410
 411       if (pa_tagstruct_getu32(t, &mode) < 0 ||
 412         pa_tagstruct_get_boolean(t, &apply_immediately) < 0)
 413         goto fail;
 414
 415       if (mode != PA_UPDATE_MERGE &&
 416         mode != PA_UPDATE_REPLACE &&
 417         mode != PA_UPDATE_SET)
 418         goto fail;
 419
 420       if (mode == PA_UPDATE_SET)
 421         pa_database_clear(u->database);
 422
 423       while (!pa_tagstruct_eof(t)) {
 424         const char *name, *description;
 425         struct entry entry;
 426         pa_datum key, data;
 427
 428         pa_zero(entry);
 429         entry.version = ENTRY_VERSION;
 430
 431         if (pa_tagstruct_gets(t, &name) < 0 ||
 432           pa_tagstruct_gets(reply, &description) < 0)
 433           goto fail;
 434
 435         if (!name || !*name)
 436           goto fail;
 437
 438         pa_strlcpy(entry.description, description, sizeof(entry.description));
 439
 440         key.data = (char*) name;
 441         key.size = strlen(name);
 442
 443         data.data = &entry;
 444         data.size = sizeof(entry);
 445
 446         if (pa_database_set(u->database, &key, &data, mode == PA_UPDATE_REPLACE) == 0)
 447           if (apply_immediately)
 448             apply_entry(u, name, &entry);
 449       }
 450
 451       trigger_save(u);
 452
 453       break;
 454     }
 455
 456     case SUBCOMMAND_DELETE:
 457
 458       while (!pa_tagstruct_eof(t)) {
 459         const char *name;
 460         pa_datum key;
 461
 462         if (pa_tagstruct_gets(t, &name) < 0)
 463           goto fail;
 464
 465         key.data = (char*) name;
 466         key.size = strlen(name);
 467
 468         pa_database_unset(u->database, &key);
 469       }
 470
 471       trigger_save(u);
 472
 473       break;
 474
 475     case SUBCOMMAND_SUBSCRIBE: {
 476
 477       pa_bool_t enabled;
 478
 479       if (pa_tagstruct_get_boolean(t, &enabled) < 0 ||
 480         !pa_tagstruct_eof(t))
 481         goto fail;
 482
 483       if (enabled)
 484         pa_idxset_put(u->subscribed, c, NULL);
 485       else
 486         pa_idxset_remove_by_data(u->subscribed, c, NULL);
 487
 488       break;
 489     }
 490
 491     default:
 492       goto fail;
 493   }
 494
 495   pa_pstream_send_tagstruct(pa_native_connection_get_pstream(c), reply);
 496   return 0;
 497
 498   fail:
 499
 500   if (reply)
 501     pa_tagstruct_free(reply);
 502
 503   return -1;
 504 }
 505
 506 static pa_hook_result_t connection_unlink_hook_cb(pa_native_protocol *p, pa_native_connection *c, struct userdata *u) {
 507     pa_assert(p);
 508     pa_assert(c);
 509     pa_assert(u);
 510
 511     pa_idxset_remove_by_data(u->subscribed, c, NULL);
 512     return PA_HOOK_OK;
 513 }
 514
 515 int pa__init(pa_module*m) {
 516     pa_modargs *ma = NULL;
 517     struct userdata *u;
 518     char *fname;
 519     pa_sink *sink;
 520     pa_source *source;
 521     uint32_t idx;
 522
 523     pa_assert(m);
 524
 525     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 526         pa_log("Failed to parse module arguments");
 527         goto fail;
 528     }
 529
 530     m->userdata = u = pa_xnew0(struct userdata, 1);
 531     u->core = m->core;
 532     u->module = m;
 533     u->subscribed = pa_idxset_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 534
 535     u->protocol = pa_native_protocol_get(m->core);
 536     pa_native_protocol_install_ext(u->protocol, m, extension_cb);
 537
 538     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);
 539
 540     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_SINK|PA_SUBSCRIPTION_MASK_SOURCE, subscribe_callback, u);
 541
 542     u->sink_new_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) sink_new_hook_callback, u);
 543     u->source_new_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) source_new_hook_callback, u);
 544
 545     if (!(fname = pa_state_path("device-manager", TRUE)))
 546         goto fail;
 547
 548     if (!(u->database = pa_database_open(fname, TRUE))) {
 549         pa_log("Failed to open volume database '%s': %s", fname, pa_cstrerror(errno));
 550         pa_xfree(fname);
 551         goto fail;
 552     }
 553
 554     pa_log_info("Sucessfully opened database file '%s'.", fname);
 555     pa_xfree(fname);
 556
 557     for (sink = pa_idxset_first(m->core->sinks, &idx); sink; sink = pa_idxset_next(m->core->sinks, &idx))
 558         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_NEW, sink->index, u);
 559
 560     for (source = pa_idxset_first(m->core->sources, &idx); source; source = pa_idxset_next(m->core->sources, &idx))
 561         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_NEW, source->index, u);
 562
 563     pa_modargs_free(ma);
 564     return 0;
 565
 566 fail:
 567     pa__done(m);
 568
 569     if (ma)
 570         pa_modargs_free(ma);
 571
 572     return  -1;
 573 }
 574
 575 void pa__done(pa_module*m) {
 576     struct userdata* u;
 577
 578     pa_assert(m);
 579
 580     if (!(u = m->userdata))
 581         return;
 582
 583     if (u->subscription)
 584         pa_subscription_free(u->subscription);
 585
 586     if (u->sink_new_hook_slot)
 587         pa_hook_slot_free(u->sink_new_hook_slot);
 588     if (u->source_new_hook_slot)
 589         pa_hook_slot_free(u->source_new_hook_slot);
 590
 591     if (u->save_time_event)
 592         u->core->mainloop->time_free(u->save_time_event);
 593
 594     if (u->database)
 595         pa_database_close(u->database);
 596
 597     if (u->protocol) {
 598         pa_native_protocol_remove_ext(u->protocol, m);
 599         pa_native_protocol_unref(u->protocol);
 600     }
 601
 602     if (u->subscribed)
 603         pa_idxset_free(u->subscribed, NULL, NULL);
 604
 605     pa_xfree(u);
 606 }