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 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_name)
  61         pa_log_info("Manually configured default sink, not overwriting.");
  62     else if ((f = fopen(u->sink_filename, "r"))) {
  63         char ln[256] = "";
  64
  65         fgets(ln, sizeof(ln)-1, f);
  66         pa_strip_nl(ln);
  67         fclose(f);
  68
  69         if (!ln[0])
  70             pa_log_info("No previous default sink setting, ignoring.");
  71         else if (pa_namereg_get(u->core, ln, PA_NAMEREG_SINK, TRUE)) {
  72             pa_namereg_set_default(u->core, ln, PA_NAMEREG_SINK);
  73             pa_log_info("Restored default sink '%s'.", ln);
  74         } else
  75             pa_log_info("Saved default sink '%s' not existant, not restoring default sink setting.", ln);
  76
  77     } else if (errno != ENOENT)
  78         pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
  79
  80     if (u->core->default_source_name)
  81         pa_log_info("Manually configured default source, not overwriting.");
  82     else if ((f = fopen(u->source_filename, "r"))) {
  83         char ln[256] = "";
  84
  85         fgets(ln, sizeof(ln)-1, f);
  86         pa_strip_nl(ln);
  87         fclose(f);
  88
  89         if (!ln[0])
  90             pa_log_info("No previous default source setting, ignoring.");
  91         else if (pa_namereg_get(u->core, ln, PA_NAMEREG_SOURCE, TRUE)) {
  92             pa_namereg_set_default(u->core, ln, PA_NAMEREG_SOURCE);
  93             pa_log_info("Restored default source '%s'.", ln);
  94         } else
  95             pa_log_info("Saved default source '%s' not existant, not restoring default source setting.", ln);
  96
  97     } else if (errno != ENOENT)
  98             pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
  99 }
 100
 101 static void save(struct userdata *u) {
 102     FILE *f;
 103
 104     if (!u->modified)
 105         return;
 106
 107     if (u->sink_filename) {
 108         if ((f = fopen(u->sink_filename, "w"))) {
 109             const char *n = pa_namereg_get_default_sink_name(u->core);
 110             fprintf(f, "%s\n", pa_strempty(n));
 111             fclose(f);
 112         } else
 113             pa_log("Failed to save default sink: %s", pa_cstrerror(errno));
 114     }
 115
 116     if (u->source_filename) {
 117         if ((f = fopen(u->source_filename, "w"))) {
 118             const char *n = pa_namereg_get_default_source_name(u->core);
 119             fprintf(f, "%s\n", pa_strempty(n));
 120             fclose(f);
 121         } else
 122             pa_log("Failed to save default source: %s", pa_cstrerror(errno));
 123     }
 124
 125     u->modified = FALSE;
 126 }
 127
 128 static void time_cb(pa_mainloop_api *a, pa_time_event *e, const struct timeval *tv, void *userdata) {
 129     struct userdata *u = userdata;
 130
 131     pa_assert(u);
 132     save(u);
 133
 134     if (u->time_event) {
 135         u->core->mainloop->time_free(u->time_event);
 136         u->time_event = NULL;
 137     }
 138 }
 139
 140 static void subscribe_cb(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 141     struct userdata *u = userdata;
 142
 143     pa_assert(u);
 144
 145     u->modified = TRUE;
 146
 147     if (!u->time_event) {
 148         struct timeval tv;
 149         pa_gettimeofday(&tv);
 150         pa_timeval_add(&tv, DEFAULT_SAVE_INTERVAL*PA_USEC_PER_SEC);
 151         u->time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, time_cb, u);
 152     }
 153 }
 154
 155 int pa__init(pa_module *m) {
 156     struct userdata *u;
 157     char hn[256], *fn;
 158
 159     pa_assert(m);
 160
 161     m->userdata = u = pa_xnew0(struct userdata, 1);
 162     u->core = m->core;
 163
 164     if (!pa_get_host_name(hn, sizeof(hn)))
 165         goto fail;
 166
 167     fn = pa_sprintf_malloc("default-sink.%s", hn);
 168     u->sink_filename = pa_state_path(fn);
 169     pa_xfree(fn);
 170
 171     if (!u->sink_filename)
 172         goto fail;
 173
 174     fn = pa_sprintf_malloc("default-source.%s", hn);
 175     u->source_filename = pa_state_path(fn);
 176     pa_xfree(fn);
 177
 178     if (!u->source_filename)
 179         goto fail;
 180
 181     load(u);
 182
 183     u->subscription = pa_subscription_new(u->core, PA_SUBSCRIPTION_MASK_SERVER, subscribe_cb, u);
 184
 185     return 0;
 186
 187 fail:
 188     pa__done(m);
 189
 190     return -1;
 191 }
 192
 193 void pa__done(pa_module*m) {
 194     struct userdata *u;
 195
 196     pa_assert(m);
 197
 198     if (!(u = m->userdata))
 199         return;
 200
 201     save(u);
 202
 203     if (u->subscription)
 204         pa_subscription_free(u->subscription);
 205
 206     if (u->time_event)
 207         m->core->mainloop->time_free(u->time_event);
 208
 209     pa_xfree(u->sink_filename);
 210     pa_xfree(u->source_filename);
 211     pa_xfree(u);
 212 }