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-rw-r--r--src/state_file.c76
1 files changed, 52 insertions, 24 deletions
diff --git a/src/state_file.c b/src/state_file.c
index 9c6475cc8..d9ae155a3 100644
--- a/src/state_file.c
+++ b/src/state_file.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -17,10 +17,13 @@
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#include "config.h"
#include "state_file.h"
#include "output_state.h"
#include "playlist.h"
+#include "playlist_state.h"
#include "volume.h"
+#include "glib_compat.h"
#include <glib.h>
#include <assert.h>
@@ -30,28 +33,26 @@
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "state_file"
-static struct _sf_cb {
- void (*reader)(FILE *);
- void (*writer)(FILE *);
-} sf_callbacks [] = {
- { read_sw_volume_state, save_sw_volume_state },
- { readAudioDevicesState, saveAudioDevicesState },
- { readPlaylistState, savePlaylistState },
-};
-
static char *state_file_path;
/** the GLib source id for the save timer */
static guint save_state_source_id;
+/**
+ * These version numbers determine whether we need to save the state
+ * file. If nothing has changed, we won't let the hard drive spin up.
+ */
+static unsigned prev_volume_version, prev_output_version,
+ prev_playlist_version;
+
static void
state_file_write(void)
{
- unsigned int i;
FILE *fp;
- if (state_file_path == NULL)
- return;
+ assert(state_file_path != NULL);
+
+ g_debug("Saving state file %s", state_file_path);
fp = fopen(state_file_path, "w");
if (G_UNLIKELY(!fp)) {
@@ -60,21 +61,27 @@ state_file_write(void)
return;
}
- for (i = 0; i < G_N_ELEMENTS(sf_callbacks); i++)
- sf_callbacks[i].writer(fp);
+ save_sw_volume_state(fp);
+ audio_output_state_save(fp);
+ playlist_state_save(fp, &g_playlist);
while(fclose(fp) && errno == EINTR) /* nothing */;
+
+ prev_volume_version = sw_volume_state_get_hash();
+ prev_output_version = audio_output_state_get_version();
+ prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
static void
state_file_read(void)
{
- unsigned int i;
FILE *fp;
+ char line[1024];
+ bool success;
assert(state_file_path != NULL);
- g_debug("Saving state file");
+ g_debug("Loading state file %s", state_file_path);
fp = fopen(state_file_path, "r");
if (G_UNLIKELY(!fp)) {
@@ -82,12 +89,22 @@ state_file_read(void)
state_file_path, strerror(errno));
return;
}
- for (i = 0; i < G_N_ELEMENTS(sf_callbacks); i++) {
- sf_callbacks[i].reader(fp);
- rewind(fp);
+
+ while (fgets(line, sizeof(line), fp) != NULL) {
+ g_strchomp(line);
+
+ success = read_sw_volume_state(line) ||
+ audio_output_state_read(line) ||
+ playlist_state_restore(line, fp, &g_playlist);
+ if (!success)
+ g_warning("Unrecognized line in state file: %s", line);
}
while(fclose(fp) && errno == EINTR) /* nothing */;
+
+ prev_volume_version = sw_volume_state_get_hash();
+ prev_output_version = audio_output_state_get_version();
+ prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
/**
@@ -97,6 +114,13 @@ state_file_read(void)
static gboolean
timer_save_state_file(G_GNUC_UNUSED gpointer data)
{
+ if (prev_volume_version == sw_volume_state_get_hash() &&
+ prev_output_version == audio_output_state_get_version() &&
+ prev_playlist_version == playlist_state_get_hash(&g_playlist))
+ /* nothing has changed - don't save the state file,
+ don't spin up the hard disk */
+ return true;
+
state_file_write();
return true;
}
@@ -112,18 +136,22 @@ state_file_init(const char *path)
state_file_path = g_strdup(path);
state_file_read();
- save_state_source_id = g_timeout_add(5 * 60 * 1000,
- timer_save_state_file, NULL);
+ save_state_source_id = g_timeout_add_seconds(5 * 60,
+ timer_save_state_file,
+ NULL);
}
void
state_file_finish(void)
{
+ if (state_file_path == NULL)
+ /* no state file configured, no cleanup required */
+ return;
+
if (save_state_source_id != 0)
g_source_remove(save_state_source_id);
- if (state_file_path != NULL)
- state_file_write();
+ state_file_write();
g_free(state_file_path);
}