code.delx.au - pulseaudio/blob - src/modules/module-default-device-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 <errno.h>
  27 #include <stdio.h>
  28
  29 #include <pulse/timeval.h>
  30 #include <pulse/util.h>
  31
  32 #include <pulsecore/core-util.h>
  33 #include <pulsecore/module.h>
  34 #include <pulsecore/log.h>
  35 #include <pulsecore/namereg.h>
  36 #include <pulsecore/core-error.h>
  37
  38 #include "module-default-device-restore-symdef.h"
  39
  40 PA_MODULE_AUTHOR("Lennart Poettering");
  41 PA_MODULE_DESCRIPTION("Automatically restore the default sink and source");
  42 PA_MODULE_VERSION(PACKAGE_VERSION);
  43 PA_MODULE_LOAD_ONCE(TRUE);
  44
  45 #define DEFAULT_SAVE_INTERVAL 5
  46
  47 struct userdata {
  48     pa_core *core;
  49     pa_subscription *subscription;
  50     pa_time_event *time_event;
  51     char *sink_filename, *source_filename;
  52     pa_bool_t modified;
  53 };
  54
  55 static void load(struct userdata *u) {
  56     FILE *f;
  57
  58     /* We never overwrite manually configured settings */
  59
  60     if (u->core->default_sink)
  61         pa_log_info("Manually configured default sink, not overwriting.");
  62     else if ((f = fopen(u->sink_filename, "r"))) {
  63         char ln[256] = "";
  64         pa_sink *s;
  65
  66         fgets(ln, sizeof(ln)-1, f);
  67         pa_strip_nl(ln);
  68         fclose(f);
  69
  70         if (!ln[0])
  71             pa_log_info("No previous default sink setting, ignoring.");
  72         else if ((s = pa_namereg_get(u->core, ln, PA_NAMEREG_SINK))) {
  73             pa_namereg_set_default_sink(u->core, s);
  74             pa_log_info("Restored default sink '%s'.", ln);
  75         } else
  76             pa_log_info("Saved default sink '%s' not existant, not restoring default sink setting.", ln);
  77
  78     } else if (errno != ENOENT)
  79         pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
  80
  81     if (u->core->default_source)
  82         pa_log_info("Manually configured default source, not overwriting.");
  83     else if ((f = fopen(u->source_filename, "r"))) {
  84         char ln[256] = "";
  85         pa_source *s;
  86
  87         fgets(ln, sizeof(ln)-1, f);
  88         pa_strip_nl(ln);
  89         fclose(f);
  90
  91         if (!ln[0])
  92             pa_log_info("No previous default source setting, ignoring.");
  93         else if ((s = pa_namereg_get(u->core, ln, PA_NAMEREG_SOURCE))) {
  94             pa_namereg_set_default_source(u->core, s);
  95             pa_log_info("Restored default source '%s'.", ln);
  96         } else
  97             pa_log_info("Saved default source '%s' not existant, not restoring default source setting.", ln);
  98
  99     } else if (errno != ENOENT)
 100             pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
 101 }
 102
 103 static void save(struct userdata *u) {
 104     FILE *f;
 105
 106     if (!u->modified)
 107         return;
 108
 109     if (u->sink_filename) {
 110         if ((f = fopen(u->sink_filename, "w"))) {
 111             pa_sink *s = pa_namereg_get_default_sink(u->core);
 112             fprintf(f, "%s\n", s ? s->name : "");
 113             fclose(f);
 114         } else
 115             pa_log("Failed to save default sink: %s", pa_cstrerror(errno));
 116     }
 117
 118     if (u->source_filename) {
 119         if ((f = fopen(u->source_filename, "w"))) {
 120             pa_source *s = pa_namereg_get_default_source(u->core);
 121             fprintf(f, "%s\n", s ? s->name : "");
 122             fclose(f);
 123         } else
 124             pa_log("Failed to save default source: %s", pa_cstrerror(errno));
 125     }
 126
 127     u->modified = FALSE;
 128 }
 129
 130 static void time_cb(pa_mainloop_api *a, pa_time_event *e, const struct timeval *tv, void *userdata) {
 131     struct userdata *u = userdata;
 132
 133     pa_assert(u);
 134     save(u);
 135
 136     if (u->time_event) {
 137         u->core->mainloop->time_free(u->time_event);
 138         u->time_event = NULL;
 139     }
 140 }
 141
 142 static void subscribe_cb(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 143     struct userdata *u = userdata;
 144
 145     pa_assert(u);
 146
 147     u->modified = TRUE;
 148
 149     if (!u->time_event) {
 150         struct timeval tv;
 151         pa_gettimeofday(&tv);
 152         pa_timeval_add(&tv, DEFAULT_SAVE_INTERVAL*PA_USEC_PER_SEC);
 153         u->time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, time_cb, u);
 154     }
 155 }
 156
 157 int pa__init(pa_module *m) {
 158     struct userdata *u;
 159
 160     pa_assert(m);
 161
 162     m->userdata = u = pa_xnew0(struct userdata, 1);
 163     u->core = m->core;
 164
 165     if (!(u->sink_filename = pa_state_path("default-sink", TRUE)))
 166         goto fail;
 167
 168     if (!(u->source_filename = pa_state_path("default-source", TRUE)))
 169         goto fail;
 170
 171     load(u);
 172
 173     u->subscription = pa_subscription_new(u->core, PA_SUBSCRIPTION_MASK_SERVER, subscribe_cb, u);
 174
 175     return 0;
 176
 177 fail:
 178     pa__done(m);
 179
 180     return -1;
 181 }
 182
 183 void pa__done(pa_module*m) {
 184     struct userdata *u;
 185
 186     pa_assert(m);
 187
 188     if (!(u = m->userdata))
 189         return;
 190
 191     save(u);
 192
 193     if (u->subscription)
 194         pa_subscription_free(u->subscription);
 195
 196     if (u->time_event)
 197         m->core->mainloop->time_free(u->time_event);
 198
 199     pa_xfree(u->sink_filename);
 200     pa_xfree(u->source_filename);
 201     pa_xfree(u);
 202 }