code.delx.au - pulseaudio/blob - 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 #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/card.h>
  47 #include <pulsecore/namereg.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
  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     GDBM_FILE gdbm_file;
  69 };
  70
  71 #define ENTRY_VERSION 1
  72
  73 struct entry {
  74     uint8_t version;
  75     char profile[PA_NAME_MAX];
  76 } PA_GCC_PACKED ;
  77
  78 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *tv, void *userdata) {
  79     struct userdata *u = userdata;
  80
  81     pa_assert(a);
  82     pa_assert(e);
  83     pa_assert(tv);
  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     gdbm_sync(u->gdbm_file);
  91     pa_log_info("Synced.");
  92 }
  93
  94 static struct entry* read_entry(struct userdata *u, const char *name) {
  95     datum key, data;
  96     struct entry *e;
  97
  98     pa_assert(u);
  99     pa_assert(name);
 100
 101     key.dptr = (char*) name;
 102     key.dsize = (int) strlen(name);
 103
 104     data = gdbm_fetch(u->gdbm_file, key);
 105
 106     if (!data.dptr)
 107         goto fail;
 108
 109     if (data.dsize != 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.dsize, (unsigned long) sizeof(struct entry));
 111         goto fail;
 112     }
 113
 114     e = (struct entry*) data.dptr;
 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_xfree(data.dptr);
 131     return NULL;
 132 }
 133
 134 static void trigger_save(struct userdata *u) {
 135     struct timeval tv;
 136
 137     if (u->save_time_event)
 138         return;
 139
 140     pa_gettimeofday(&tv);
 141     tv.tv_sec += SAVE_INTERVAL;
 142     u->save_time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, save_time_callback, u);
 143 }
 144
 145 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 146     struct userdata *u = userdata;
 147     struct entry entry, *old;
 148     datum key, data;
 149     pa_card *card;
 150
 151     pa_assert(c);
 152     pa_assert(u);
 153
 154     if (t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW) &&
 155         t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE))
 156         return;
 157
 158     memset(&entry, 0, sizeof(entry));
 159     entry.version = ENTRY_VERSION;
 160
 161     if (!(card = pa_idxset_get_by_index(c->cards, idx)))
 162         return;
 163
 164     pa_strlcpy(entry.profile, card->active_profile ? card->active_profile->name : "", sizeof(entry.profile));
 165
 166     if ((old = read_entry(u, card->name))) {
 167
 168         if (strncmp(old->profile, entry.profile, sizeof(entry.profile)) == 0) {
 169             pa_xfree(old);
 170             return;
 171         }
 172
 173         pa_xfree(old);
 174     }
 175
 176     key.dptr = card->name;
 177     key.dsize = (int) strlen(card->name);
 178
 179     data.dptr = (void*) &entry;
 180     data.dsize = sizeof(entry);
 181
 182     pa_log_info("Storing profile for card %s.", card->name);
 183
 184     gdbm_store(u->gdbm_file, key, data, GDBM_REPLACE);
 185
 186     trigger_save(u);
 187 }
 188
 189 static pa_hook_result_t card_new_hook_callback(pa_core *c, pa_card_new_data *new_data, struct userdata *u) {
 190     struct entry *e;
 191
 192     pa_assert(new_data);
 193
 194     if ((e = read_entry(u, new_data->name)) && e->profile[0]) {
 195
 196         if (!new_data->active_profile) {
 197             pa_card_new_data_set_profile(new_data, e->profile);
 198             pa_log_info("Restoring profile for card %s.", new_data->name);
 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, *fn;
 212     pa_card *card;
 213     uint32_t idx;
 214     int gdbm_cache_size;
 215
 216     pa_assert(m);
 217
 218     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 219         pa_log("Failed to parse module arguments");
 220         goto fail;
 221     }
 222
 223     m->userdata = u = pa_xnew(struct userdata, 1);
 224     u->core = m->core;
 225     u->module = m;
 226     u->save_time_event = NULL;
 227     u->gdbm_file = NULL;
 228
 229     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_CARD, subscribe_callback, u);
 230
 231     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);
 232
 233     /* We include the host identifier in the file name because gdbm
 234      * files are CPU dependant, and we don't want things to go wrong
 235      * if we are on a multiarch system. */
 236
 237     fn = pa_sprintf_malloc("card-database."CANONICAL_HOST".gdbm");
 238     fname = pa_state_path(fn, TRUE);
 239     pa_xfree(fn);
 240
 241     if (!fname)
 242         goto fail;
 243
 244     if (!(u->gdbm_file = gdbm_open(fname, 0, GDBM_WRCREAT|GDBM_NOLOCK, 0600, NULL))) {
 245         pa_log("Failed to open volume database '%s': %s", fname, gdbm_strerror(gdbm_errno));
 246         pa_xfree(fname);
 247         goto fail;
 248     }
 249
 250     /* By default the cache of gdbm is rather large, let's reduce it a bit to save memory */
 251     gdbm_cache_size = 10;
 252     gdbm_setopt(u->gdbm_file, GDBM_CACHESIZE, &gdbm_cache_size, sizeof(gdbm_cache_size));
 253
 254     pa_log_info("Sucessfully opened database file '%s'.", fname);
 255     pa_xfree(fname);
 256
 257     for (card = pa_idxset_first(m->core->cards, &idx); card; card = pa_idxset_next(m->core->cards, &idx))
 258         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW, card->index, u);
 259
 260     pa_modargs_free(ma);
 261     return 0;
 262
 263 fail:
 264     pa__done(m);
 265
 266     if (ma)
 267         pa_modargs_free(ma);
 268
 269     return  -1;
 270 }
 271
 272 void pa__done(pa_module*m) {
 273     struct userdata* u;
 274
 275     pa_assert(m);
 276
 277     if (!(u = m->userdata))
 278         return;
 279
 280     if (u->subscription)
 281         pa_subscription_free(u->subscription);
 282
 283     if (u->card_new_hook_slot)
 284         pa_hook_slot_free(u->card_new_hook_slot);
 285
 286     if (u->save_time_event)
 287         u->core->mainloop->time_free(u->save_time_event);
 288
 289     if (u->gdbm_file)
 290         gdbm_close(u->gdbm_file);
 291
 292     pa_xfree(u);
 293 }