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