src/output_state.c

   1 /*
   2  * Copyright (C) 2003-2010 The Music Player Daemon Project
   3  * http://www.musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 /*
  21  * Saving and loading the audio output states to/from the state file.
  22  *
  23  */
  24
  25 #include "config.h"
  26 #include "output_state.h"
  27 #include "output_internal.h"
  28 #include "output_all.h"
  29
  30 #include <glib.h>
  31
  32 #include <assert.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #define AUDIO_DEVICE_STATE "audio_device_state:"
  37
  38 unsigned audio_output_state_version;
  39
  40 void
  41 audio_output_state_save(FILE *fp)
  42 {
  43         unsigned n = audio_output_count();
  44
  45         assert(n > 0);
  46
  47         for (unsigned i = 0; i < n; ++i) {
  48                 const struct audio_output *ao = audio_output_get(i);
  49
  50                 fprintf(fp, AUDIO_DEVICE_STATE "%d:%s\n",
  51                         ao->enabled, ao->name);
  52         }
  53 }
  54
  55 bool
  56 audio_output_state_read(const char *line)
  57 {
  58         long value;
  59         char *endptr;
  60         const char *name;
  61         struct audio_output *ao;
  62
  63         if (!g_str_has_prefix(line, AUDIO_DEVICE_STATE))
  64                 return false;
  65
  66         line += sizeof(AUDIO_DEVICE_STATE) - 1;
  67
  68         value = strtol(line, &endptr, 10);
  69         if (*endptr != ':' || (value != 0 && value != 1))
  70                 return false;
  71
  72         if (value != 0)
  73                 /* state is "enabled": no-op */
  74                 return true;
  75
  76         name = endptr + 1;
  77         ao = audio_output_find(name);
  78         if (ao == NULL) {
  79                 g_debug("Ignoring device state for '%s'", name);
  80                 return true;
  81         }
  82
  83         ao->enabled = false;
  84         return true;
  85 }
  86
  87 unsigned
  88 audio_output_state_get_version(void)
  89 {
  90         return audio_output_state_version;
  91 }