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 #include <ctype.h>
  33
  34 #include <pulse/xmalloc.h>
  35 #include <pulse/volume.h>
  36 #include <pulse/timeval.h>
  37 #include <pulse/util.h>
  38 #include <pulse/rtclock.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/card.h>
  47 #include <pulsecore/namereg.h>
  48 #include <pulsecore/database.h>
  49
  50 #include "module-card-restore-symdef.h"
  51
  52 PA_MODULE_AUTHOR("Lennart Poettering");
  53 PA_MODULE_DESCRIPTION("Automatically restore profile of cards");
  54 PA_MODULE_VERSION(PACKAGE_VERSION);
  55 PA_MODULE_LOAD_ONCE(TRUE);
  56
  57 #define SAVE_INTERVAL (10 * PA_USEC_PER_SEC)
  58
  59 static const char* const valid_modargs[] = {
  60     NULL
  61 };
  62
  63 struct userdata {
  64     pa_core *core;
  65     pa_module *module;
  66     pa_subscription *subscription;
  67     pa_hook_slot *card_new_hook_slot;
  68     pa_time_event *save_time_event;
  69     pa_database *database;
  70 };
  71
  72 #define ENTRY_VERSION 1
  73
  74 struct entry {
  75     uint8_t version;
  76     char profile[PA_NAME_MAX];
  77 } PA_GCC_PACKED ;
  78
  79 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *t, void *userdata) {
  80     struct userdata *u = userdata;
  81
  82     pa_assert(a);
  83     pa_assert(e);
  84     pa_assert(u);
  85
  86     pa_assert(e == u->save_time_event);
  87     u->core->mainloop->time_free(u->save_time_event);
  88     u->save_time_event = NULL;
  89
  90     pa_database_sync(u->database);
  91     pa_log_info("Synced.");
  92 }
  93
  94 static struct entry* read_entry(struct userdata *u, const char *name) {
  95     pa_datum key, data;
  96     struct entry *e;
  97
  98     pa_assert(u);
  99     pa_assert(name);
 100
 101     key.data = (char*) name;
 102     key.size = strlen(name);
 103
 104     pa_zero(data);
 105
 106     if (!pa_database_get(u->database, &key, &data))
 107         goto fail;
 108
 109     if (data.size != sizeof(struct entry)) {
 110         pa_log_debug("Database contains entry for card %s of wrong size %lu != %lu. Probably due to upgrade, ignoring.", name, (unsigned long) data.size, (unsigned long) sizeof(struct entry));
 111         goto fail;
 112     }
 113
 114     e = (struct entry*) data.data;
 115
 116     if (e->version != ENTRY_VERSION) {
 117         pa_log_debug("Version of database entry for card %s doesn't match our version. Probably due to upgrade, ignoring.", name);
 118         goto fail;
 119     }
 120
 121     if (!memchr(e->profile, 0, sizeof(e->profile))) {
 122         pa_log_warn("Database contains entry for card %s with missing NUL byte in profile name", name);
 123         goto fail;
 124     }
 125
 126     return e;
 127
 128 fail:
 129
 130     pa_datum_free(&data);
 131     return NULL;
 132 }
 133
 134 static void trigger_save(struct userdata *u) {
 135     if (u->save_time_event)
 136         return;
 137
 138     u->save_time_event = pa_core_rttime_new(u->core, pa_rtclock_now() + SAVE_INTERVAL, save_time_callback, u);
 139 }
 140
 141 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 142     struct userdata *u = userdata;
 143     struct entry entry, *old;
 144     pa_datum key, data;
 145     pa_card *card;
 146
 147     pa_assert(c);
 148     pa_assert(u);
 149
 150     if (t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW) &&
 151         t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE))
 152         return;
 153
 154     pa_zero(entry);
 155     entry.version = ENTRY_VERSION;
 156
 157     if (!(card = pa_idxset_get_by_index(c->cards, idx)))
 158         return;
 159
 160     if (!card->save_profile)
 161         return;
 162
 163     pa_strlcpy(entry.profile, card->active_profile ? card->active_profile->name : "", sizeof(entry.profile));
 164
 165     if ((old = read_entry(u, card->name))) {
 166
 167         if (strncmp(old->profile, entry.profile, sizeof(entry.profile)) == 0) {
 168             pa_xfree(old);
 169             return;
 170         }
 171
 172         pa_xfree(old);
 173     }
 174
 175     key.data = card->name;
 176     key.size = strlen(card->name);
 177
 178     data.data = &entry;
 179     data.size = sizeof(entry);
 180
 181     pa_log_info("Storing profile for card %s.", card->name);
 182
 183     pa_database_set(u->database, &key, &data, TRUE);
 184
 185     trigger_save(u);
 186 }
 187
 188 static pa_hook_result_t card_new_hook_callback(pa_core *c, pa_card_new_data *new_data, struct userdata *u) {
 189     struct entry *e;
 190
 191     pa_assert(new_data);
 192
 193     if ((e = read_entry(u, new_data->name)) && e->profile[0]) {
 194
 195         if (!new_data->active_profile) {
 196             pa_log_info("Restoring profile for card %s.", new_data->name);
 197             pa_card_new_data_set_profile(new_data, e->profile);
 198             new_data->save_profile = TRUE;
 199         } else
 200             pa_log_debug("Not restoring profile for card %s, because already set.", new_data->name);
 201
 202         pa_xfree(e);
 203     }
 204
 205     return PA_HOOK_OK;
 206 }
 207
 208 int pa__init(pa_module*m) {
 209     pa_modargs *ma = NULL;
 210     struct userdata *u;
 211     char *fname;
 212     pa_card *card;
 213     uint32_t idx;
 214
 215     pa_assert(m);
 216
 217     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 218         pa_log("Failed to parse module arguments");
 219         goto fail;
 220     }
 221
 222     m->userdata = u = pa_xnew0(struct userdata, 1);
 223     u->core = m->core;
 224     u->module = m;
 225
 226     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_CARD, subscribe_callback, u);
 227
 228     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);
 229
 230     if (!(fname = pa_state_path("card-database", TRUE)))
 231         goto fail;
 232
 233     if (!(u->database = pa_database_open(fname, TRUE))) {
 234         pa_log("Failed to open volume database '%s': %s", fname, pa_cstrerror(errno));
 235         pa_xfree(fname);
 236         goto fail;
 237     }
 238
 239     pa_log_info("Sucessfully opened database file '%s'.", fname);
 240     pa_xfree(fname);
 241
 242     for (card = pa_idxset_first(m->core->cards, &idx); card; card = pa_idxset_next(m->core->cards, &idx))
 243         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW, card->index, u);
 244
 245     pa_modargs_free(ma);
 246     return 0;
 247
 248 fail:
 249     pa__done(m);
 250
 251     if (ma)
 252         pa_modargs_free(ma);
 253
 254     return  -1;
 255 }
 256
 257 void pa__done(pa_module*m) {
 258     struct userdata* u;
 259
 260     pa_assert(m);
 261
 262     if (!(u = m->userdata))
 263         return;
 264
 265     if (u->subscription)
 266         pa_subscription_free(u->subscription);
 267
 268     if (u->card_new_hook_slot)
 269         pa_hook_slot_free(u->card_new_hook_slot);
 270
 271     if (u->save_time_event)
 272         u->core->mainloop->time_free(u->save_time_event);
 273
 274     if (u->database)
 275         pa_database_close(u->database);
 276
 277     pa_xfree(u);
 278 }