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 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 struct entry {
  72     char profile[PA_NAME_MAX];
  73 };
  74
  75 static void save_time_callback(pa_mainloop_api*a, pa_time_event* e, const struct timeval *tv, void *userdata) {
  76     struct userdata *u = userdata;
  77
  78     pa_assert(a);
  79     pa_assert(e);
  80     pa_assert(tv);
  81     pa_assert(u);
  82
  83     pa_assert(e == u->save_time_event);
  84     u->core->mainloop->time_free(u->save_time_event);
  85     u->save_time_event = NULL;
  86
  87     gdbm_sync(u->gdbm_file);
  88     pa_log_info("Synced.");
  89 }
  90
  91 static struct entry* read_entry(struct userdata *u, const char *name) {
  92     datum key, data;
  93     struct entry *e;
  94
  95     pa_assert(u);
  96     pa_assert(name);
  97
  98     key.dptr = (char*) name;
  99     key.dsize = (int) strlen(name);
 100
 101     data = gdbm_fetch(u->gdbm_file, key);
 102
 103     if (!data.dptr)
 104         goto fail;
 105
 106     if (data.dsize != sizeof(struct entry)) {
 107         pa_log_warn("Database contains entry for card %s of wrong size %lu != %lu", name, (unsigned long) data.dsize, (unsigned long) sizeof(struct entry));
 108         goto fail;
 109     }
 110
 111     e = (struct entry*) data.dptr;
 112
 113     if (!memchr(e->profile, 0, sizeof(e->profile))) {
 114         pa_log_warn("Database contains entry for card %s with missing NUL byte in profile name", name);
 115         goto fail;
 116     }
 117
 118     return e;
 119
 120 fail:
 121
 122     pa_xfree(data.dptr);
 123     return NULL;
 124 }
 125
 126 static void trigger_save(struct userdata *u) {
 127     struct timeval tv;
 128
 129     if (u->save_time_event)
 130         return;
 131
 132     pa_gettimeofday(&tv);
 133     tv.tv_sec += SAVE_INTERVAL;
 134     u->save_time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, save_time_callback, u);
 135 }
 136
 137 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 138     struct userdata *u = userdata;
 139     struct entry entry, *old;
 140     datum key, data;
 141     pa_card *card;
 142
 143     pa_assert(c);
 144     pa_assert(u);
 145
 146     if (t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW) &&
 147         t != (PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE))
 148         return;
 149
 150     memset(&entry, 0, sizeof(entry));
 151
 152     if (!(card = pa_idxset_get_by_index(c->cards, idx)))
 153         return;
 154
 155     pa_strlcpy(entry.profile, card->active_profile ? card->active_profile->name : "", sizeof(entry.profile));
 156
 157     if ((old = read_entry(u, card->name))) {
 158
 159         if (strncmp(old->profile, entry.profile, sizeof(entry.profile)) == 0) {
 160             pa_xfree(old);
 161             return;
 162         }
 163
 164         pa_xfree(old);
 165     }
 166
 167     key.dptr = card->name;
 168     key.dsize = (int) strlen(card->name);
 169
 170     data.dptr = (void*) &entry;
 171     data.dsize = sizeof(entry);
 172
 173     pa_log_info("Storing profile for card %s.", card->name);
 174
 175     gdbm_store(u->gdbm_file, key, data, GDBM_REPLACE);
 176
 177     trigger_save(u);
 178 }
 179
 180 static pa_hook_result_t card_new_hook_callback(pa_core *c, pa_card_new_data *new_data, struct userdata *u) {
 181     struct entry *e;
 182
 183     pa_assert(new_data);
 184
 185     if ((e = read_entry(u, new_data->name)) && e->profile) {
 186
 187         if (!new_data->active_profile) {
 188             pa_card_new_data_set_profile(new_data, e->profile);
 189             pa_log_info("Restoring profile for card %s.", new_data->name);
 190         } else
 191             pa_log_debug("Not restoring profile for card %s, because already set.", new_data->name);
 192
 193         pa_xfree(e);
 194     }
 195
 196     return PA_HOOK_OK;
 197 }
 198
 199 int pa__init(pa_module*m) {
 200     pa_modargs *ma = NULL;
 201     struct userdata *u;
 202     char *fname, *fn;
 203     pa_card *card;
 204     uint32_t idx;
 205     int gdbm_cache_size;
 206
 207     pa_assert(m);
 208
 209     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 210         pa_log("Failed to parse module arguments");
 211         goto fail;
 212     }
 213
 214     m->userdata = u = pa_xnew(struct userdata, 1);
 215     u->core = m->core;
 216     u->module = m;
 217     u->save_time_event = NULL;
 218     u->gdbm_file = NULL;
 219
 220     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_CARD, subscribe_callback, u);
 221
 222     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);
 223
 224     /* We include the host identifier in the file name because gdbm
 225      * files are CPU dependant, and we don't want things to go wrong
 226      * if we are on a multiarch system. */
 227
 228     fn = pa_sprintf_malloc("card-database."CANONICAL_HOST".gdbm");
 229     fname = pa_state_path(fn, TRUE);
 230     pa_xfree(fn);
 231
 232     if (!fname)
 233         goto fail;
 234
 235     if (!(u->gdbm_file = gdbm_open(fname, 0, GDBM_WRCREAT|GDBM_NOLOCK, 0600, NULL))) {
 236         pa_log("Failed to open volume database '%s': %s", fname, gdbm_strerror(gdbm_errno));
 237         pa_xfree(fname);
 238         goto fail;
 239     }
 240
 241     /* By default the cache of gdbm is rather large, let's reduce it a bit to save memory */
 242     gdbm_cache_size = 10;
 243     gdbm_setopt(u->gdbm_file, GDBM_CACHESIZE, &gdbm_cache_size, sizeof(gdbm_cache_size));
 244
 245     pa_log_info("Sucessfully opened database file '%s'.", fname);
 246     pa_xfree(fname);
 247
 248     for (card = pa_idxset_first(m->core->cards, &idx); card; card = pa_idxset_next(m->core->cards, &idx))
 249         subscribe_callback(m->core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_NEW, card->index, u);
 250
 251     pa_modargs_free(ma);
 252     return 0;
 253
 254 fail:
 255     pa__done(m);
 256
 257     if (ma)
 258         pa_modargs_free(ma);
 259
 260     return  -1;
 261 }
 262
 263 void pa__done(pa_module*m) {
 264     struct userdata* u;
 265
 266     pa_assert(m);
 267
 268     if (!(u = m->userdata))
 269         return;
 270
 271     if (u->subscription)
 272         pa_subscription_free(u->subscription);
 273
 274     if (u->card_new_hook_slot)
 275         pa_hook_slot_free(u->card_new_hook_slot);
 276
 277     if (u->save_time_event)
 278         u->core->mainloop->time_free(u->save_time_event);
 279
 280     if (u->gdbm_file)
 281         gdbm_close(u->gdbm_file);
 282
 283     pa_xfree(u);
 284 }