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
  31 #include <pulsecore/core-util.h>
  32 #include <pulsecore/module.h>
  33 #include <pulsecore/log.h>
  34 #include <pulsecore/namereg.h>
  35 #include <pulsecore/core-error.h>
  36
  37 #include "module-default-device-restore-symdef.h"
  38
  39 PA_MODULE_AUTHOR("Lennart Poettering");
  40 PA_MODULE_DESCRIPTION("Automatically restore the default sink and source");
  41 PA_MODULE_VERSION(PACKAGE_VERSION);
  42 PA_MODULE_LOAD_ONCE(TRUE);
  43
  44 #define DEFAULT_SINK_FILE "default-sink"
  45 #define DEFAULT_SOURCE_FILE "default-source"
  46 #define DEFAULT_SAVE_INTERVAL 5
  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_name)
  62         pa_log_info("Manually configured default sink, not overwriting.");
  63     else if ((f = fopen(u->sink_filename, "r"))) {
  64         char ln[256] = "";
  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 (pa_namereg_get(u->core, ln, PA_NAMEREG_SINK, TRUE)) {
  73             pa_namereg_set_default(u->core, ln, PA_NAMEREG_SINK);
  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_name)
  82         pa_log_info("Manually configured default source, not overwriting.");
  83     else if ((f = fopen(u->source_filename, "r"))) {
  84         char ln[256] = "";
  85
  86         fgets(ln, sizeof(ln)-1, f);
  87         pa_strip_nl(ln);
  88         fclose(f);
  89
  90         if (!ln[0])
  91             pa_log_info("No previous default source setting, ignoring.");
  92         else if (pa_namereg_get(u->core, ln, PA_NAMEREG_SOURCE, TRUE)) {
  93             pa_namereg_set_default(u->core, ln, PA_NAMEREG_SOURCE);
  94             pa_log_info("Restored default source '%s'.", ln);
  95         } else
  96             pa_log_info("Saved default source '%s' not existant, not restoring default source setting.", ln);
  97
  98     } else if (errno != ENOENT)
  99             pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
 100 }
 101
 102 static void save(struct userdata *u) {
 103     FILE *f;
 104
 105     if (!u->modified)
 106         return;
 107
 108     if (u->sink_filename) {
 109         if ((f = fopen(u->sink_filename, "w"))) {
 110             const char *n = pa_namereg_get_default_sink_name(u->core);
 111             fprintf(f, "%s\n", pa_strempty(n));
 112             fclose(f);
 113         } else
 114             pa_log("Failed to save default sink: %s", pa_cstrerror(errno));
 115     }
 116
 117     if (u->source_filename) {
 118         if ((f = fopen(u->source_filename, "w"))) {
 119             const char *n = pa_namereg_get_default_source_name(u->core);
 120             fprintf(f, "%s\n", pa_strempty(n));
 121             fclose(f);
 122         } else
 123             pa_log("Failed to save default source: %s", pa_cstrerror(errno));
 124     }
 125
 126     u->modified = FALSE;
 127 }
 128
 129 static void time_cb(pa_mainloop_api *a, pa_time_event *e, const struct timeval *tv, void *userdata) {
 130     struct userdata *u = userdata;
 131
 132     pa_assert(u);
 133     save(u);
 134
 135     if (u->time_event) {
 136         u->core->mainloop->time_free(u->time_event);
 137         u->time_event = NULL;
 138     }
 139 }
 140
 141 static void subscribe_cb(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 142     struct userdata *u = userdata;
 143
 144     pa_assert(u);
 145
 146     u->modified = TRUE;
 147
 148     if (!u->time_event) {
 149         struct timeval tv;
 150         pa_gettimeofday(&tv);
 151         pa_timeval_add(&tv, DEFAULT_SAVE_INTERVAL*PA_USEC_PER_SEC);
 152         u->time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, time_cb, u);
 153     }
 154 }
 155
 156 int pa__init(pa_module *m) {
 157     struct userdata *u;
 158
 159     pa_assert(m);
 160
 161     m->userdata = u = pa_xnew0(struct userdata, 1);
 162     u->core = m->core;
 163
 164     if (!(u->sink_filename = pa_state_path(DEFAULT_SINK_FILE)))
 165         goto fail;
 166
 167     if (!(u->source_filename = pa_state_path(DEFAULT_SOURCE_FILE)))
 168         goto fail;
 169
 170     load(u);
 171
 172     u->subscription = pa_subscription_new(u->core, PA_SUBSCRIPTION_MASK_SERVER, subscribe_cb, u);
 173
 174     return 0;
 175
 176 fail:
 177     pa__done(m);
 178
 179     return -1;
 180 }
 181
 182 void pa__done(pa_module*m) {
 183     struct userdata *u;
 184
 185     pa_assert(m);
 186
 187     if (!(u = m->userdata))
 188         return;
 189
 190     save(u);
 191
 192     if (u->subscription)
 193         pa_subscription_free(u->subscription);
 194
 195     if (u->time_event)
 196         m->core->mainloop->time_free(u->time_event);
 197
 198     pa_xfree(u->sink_filename);
 199     pa_xfree(u->source_filename);
 200     pa_xfree(u);
 201 }