src/modules/module-card-restore.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006-2008 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 2.1 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 <unistd.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include <pulse/gccmacro.h>
  34 #include <pulse/xmalloc.h>
  35 #include <pulse/timeval.h>
  36 #include <pulse/rtclock.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/core-util.h>
  41 #include <pulsecore/modargs.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/core-subscribe.h>
  44 #include <pulsecore/card.h>
  45 #include <pulsecore/namereg.h>
  46 #include <pulsecore/database.h>
  47 #include <pulsecore/tagstruct.h>
  48
  49 #include "module-card-restore-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering");
  52 PA_MODULE_DESCRIPTION("Automatically restore profile of cards");
  53 PA_MODULE_VERSION(PACKAGE_VERSION);
  54 PA_MODULE_LOAD_ONCE(TRUE);
  55
  56 #define SAVE_INTERVAL (10 * PA_USEC_PER_SEC)
  57
  58 static const char* const valid_modargs[] = {
  59     NULL
  60 };
  61
  62 struct userdata {
  63     pa_core *core;
  64     pa_module *module;
  65     pa_subscription *subscription;
  66     pa_hook_slot *card_new_hook_slot;
  67     pa_time_event *save_time_event;
  68     pa_database *database;
  69 };
  70
  71 #define ENTRY_VERSION 1
  72
  73 struct entry {
  74     uint8_t version;
  75     char *profile;
  76 };
  77
  78 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *t, void *userdata) {
  79     struct userdata *u = userdata;
  80
  81     pa_assert(a);
  82     pa_assert(e);
  83     pa_assert(u);
  84
  85     pa_assert(e == u->save_time_event);
  86     u->core->mainloop->time_free(u->save_time_event);
  87     u->save_time_event = NULL;
  88
  89     pa_database_sync(u->database);
  90     pa_log_info("Synced.");
  91 }
  92
  93 static void trigger_save(struct userdata *u) {
  94     if (u->save_time_event)
  95         return;
  96
  97     u->save_time_event = pa_core_rttime_new(u->core, pa_rtclock_now() + SAVE_INTERVAL, save_time_callback, u);
  98 }
  99
 100 static struct entry* entry_new(void) {
 101     struct entry *r = pa_xnew0(struct entry, 1);
 102     r->version = ENTRY_VERSION;
 103     return r;
 104 }
 105
 106 static void entry_free(struct entry* e) {
 107     pa_assert(e);
 108
 109     pa_xfree(e->profile);
 110     pa_xfree(e);
 111 }
 112
 113 static pa_bool_t entry_write(struct userdata *u, const char *name, const struct entry *e) {
 114     pa_tagstruct *t;
 115     pa_datum key, data;
 116     pa_bool_t r;
 117
 118     pa_assert(u);
 119     pa_assert(name);
 120     pa_assert(e);
 121
 122     t = pa_tagstruct_new(NULL, 0);
 123     pa_tagstruct_putu8(t, e->version);
 124     pa_tagstruct_puts(t, e->profile);
 125
 126     key.data = (char *) name;
 127     key.size = strlen(name);
 128
 129     data.data = (void*)pa_tagstruct_data(t, &data.size);
 130
 131     r = (pa_database_set(u->database, &key, &data, TRUE) == 0);
 132
 133     pa_tagstruct_free(t);
 134
 135     return r;
 136 }
 137
 138 #ifdef ENABLE_LEGACY_DATABASE_ENTRY_FORMAT
 139
 140 #define LEGACY_ENTRY_VERSION 1
 141 static struct entry* legacy_entry_read(struct userdata *u, pa_datum *data) {
 142     struct legacy_entry {
 143         uint8_t version;
 144         char profile[PA_NAME_MAX];
 145     } PA_GCC_PACKED ;
 146     struct legacy_entry *le;
 147     struct entry *e;
 148
 149     pa_assert(u);
 150     pa_assert(data);
 151
 152     if (data->size != sizeof(struct legacy_entry)) {
 153         pa_log_debug("Size does not match.");
 154         return NULL;
 155     }
 156
 157     le = (struct legacy_entry*)data->data;
 158
 159     if (le->version != LEGACY_ENTRY_VERSION) {
 160         pa_log_debug("Version mismatch.");
 161         return NULL;
 162     }
 163
 164     if (!memchr(le->profile, 0, sizeof(le->profile))) {
 165         pa_log_warn("Profile has missing NUL byte.");
 166         return NULL;
 167     }
 168
 169     e = entry_new();
 170     e->profile = pa_xstrdup(le->profile);
 171     return e;
 172 }
 173 #endif
 174
 175 static struct entry* entry_read(struct userdata *u, const char *name) {
 176     pa_datum key, data;
 177     struct entry *e = NULL;
 178     pa_tagstruct *t = NULL;
 179     const char* profile;
 180
 181     pa_assert(u);
 182     pa_assert(name);
 183
 184     key.data = (char*) name;
 185     key.size = strlen(name);
 186
 187     pa_zero(data);
 188
 189     if (!pa_database_get(u->database, &key, &data))
 190         goto fail;
 191
 192     t = pa_tagstruct_new(data.data, data.size);
 193     e = entry_new();
 194
 195     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
 196         e->version > ENTRY_VERSION ||
 197         pa_tagstruct_gets(t, &profile) < 0) {
 198
 199         goto fail;
 200     }
 201
 202     e->profile = pa_xstrdup(profile);
 203
 204     if (!pa_tagstruct_eof(t))
 205         goto fail;
 206
 207     pa_tagstruct_free(t);
 208     pa_datum_free(&data);
 209
 210     return e;
 211
 212 fail:
 213
 214     pa_log_debug("Database contains invalid data for key: %s (probably pre-v1.0 data)", name);
 215
 216     if (e)
 217         entry_free(e);
 218     if (t)
 219         pa_tagstruct_free(t);
 220
 221 #ifdef ENABLE_LEGACY_DATABASE_ENTRY_FORMAT
 222     pa_log_debug("Attempting to load legacy (pre-v1.0) data for key: %s", name);
 223     if ((e = legacy_entry_read(u, &data))) {
 224         pa_log_debug("Success. Saving new format for key: %s", name);
 225         if (entry_write(u, name, e))
 226             trigger_save(u);
 227         pa_datum_free(&data);
 228         return e;
 229     } else
 230         pa_log_debug("Unable to load legacy (pre-v1.0) data for key: %s. Ignoring.", name);
 231 #endif
 232
 233     pa_datum_free(&data);
 234     return NULL;
 235 }
 236
 237 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 238     struct userdata *u = userdata;
 239     struct entry *entry, *old;
 240     pa_card *card;
 241
 242     pa_assert(c);
 243     pa_assert(u);
 244
 245     if (t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW) &&
 246         t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE))
 247         return;
 248
 249     entry = entry_new();
 250
 251     if (!(card = pa_idxset_get_by_index(c->cards, idx)))
 252         return;
 253
 254     if (!card->save_profile)
 255         return;
 256
 257     entry->profile = pa_xstrdup(card->active_profile ? card->active_profile->name : "");
 258
 259     if ((old = entry_read(u, card->name))) {
 260
 261         if (pa_streq(old->profile, entry->profile)) {
 262             entry_free(old);
 263             entry_free(entry);
 264             return;
 265         }
 266
 267         entry_free(old);
 268     }
 269
 270     pa_log_info("Storing profile for card %s.", card->name);
 271
 272     if (entry_write(u, card->name, entry))
 273         trigger_save(u);
 274
 275     entry_free(entry);
 276 }
 277
 278 static pa_hook_result_t card_new_hook_callback(pa_core *c, pa_card_new_data *new_data, struct userdata *u) {
 279     struct entry *e;
 280
 281     pa_assert(new_data);
 282
 283     if ((e = entry_read(u, new_data->name)) && e->profile[0]) {
 284
 285         if (!new_data->active_profile) {
 286             pa_log_info("Restoring profile for card %s.", new_data->name);
 287             pa_card_new_data_set_profile(new_data, e->profile);
 288             new_data->save_profile = TRUE;
 289         } else
 290             pa_log_debug("Not restoring profile for card %s, because already set.", new_data->name);
 291
 292         entry_free(e);
 293     }
 294
 295     return PA_HOOK_OK;
 296 }
 297
 298 int pa__init(pa_module*m) {
 299     pa_modargs *ma = NULL;
 300     struct userdata *u;
 301     char *fname;
 302     pa_card *card;
 303     uint32_t idx;
 304
 305     pa_assert(m);
 306
 307     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 308         pa_log("Failed to parse module arguments");
 309         goto fail;
 310     }
 311
 312     m->userdata = u = pa_xnew0(struct userdata, 1);
 313     u->core = m->core;
 314     u->module = m;
 315
 316     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_CARD, subscribe_callback, u);
 317
 318     u->card_new_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_CARD_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) card_new_hook_callback, u);
 319
 320     if (!(fname = pa_state_path("card-database", TRUE)))
 321         goto fail;
 322
 323     if (!(u->database = pa_database_open(fname, TRUE))) {
 324         pa_log("Failed to open volume database '%s': %s", fname, pa_cstrerror(errno));
 325         pa_xfree(fname);
 326         goto fail;
 327     }
 328
 329     pa_log_info("Successfully opened database file '%s'.", fname);
 330     pa_xfree(fname);
 331
 332     for (card = pa_idxset_first(m->core->cards, &idx); card; card = pa_idxset_next(m->core->cards, &idx))
 333         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW, card->index, u);
 334
 335     pa_modargs_free(ma);
 336     return 0;
 337
 338 fail:
 339     pa__done(m);
 340
 341     if (ma)
 342         pa_modargs_free(ma);
 343
 344     return -1;
 345 }
 346
 347 void pa__done(pa_module*m) {
 348     struct userdata* u;
 349
 350     pa_assert(m);
 351
 352     if (!(u = m->userdata))
 353         return;
 354
 355     if (u->subscription)
 356         pa_subscription_free(u->subscription);
 357
 358     if (u->card_new_hook_slot)
 359         pa_hook_slot_free(u->card_new_hook_slot);
 360
 361     if (u->save_time_event)
 362         u->core->mainloop->time_free(u->save_time_event);
 363
 364     if (u->database)
 365         pa_database_close(u->database);
 366
 367     pa_xfree(u);
 368 }