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Diffstat (limited to 'src/StateFile.cxx')
-rw-r--r-- | src/StateFile.cxx | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/StateFile.cxx b/src/StateFile.cxx new file mode 100644 index 000000000..cd344eb0e --- /dev/null +++ b/src/StateFile.cxx @@ -0,0 +1,157 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "StateFile.hxx" +#include "OutputState.hxx" +#include "playlist.h" +#include "PlaylistState.hxx" +#include "TextFile.hxx" + +extern "C" { +#include "volume.h" +} + +#include <glib.h> +#include <assert.h> +#include <string.h> +#include <errno.h> + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "state_file" + +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(struct player_control *pc) +{ + FILE *fp; + + assert(state_file_path != NULL); + + g_debug("Saving state file %s", state_file_path); + + fp = fopen(state_file_path, "w"); + if (G_UNLIKELY(!fp)) { + g_warning("failed to create %s: %s", + state_file_path, g_strerror(errno)); + return; + } + + save_sw_volume_state(fp); + audio_output_state_save(fp); + playlist_state_save(fp, &g_playlist, pc); + + fclose(fp); + + 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, pc); +} + +static void +state_file_read(struct player_control *pc) +{ + bool success; + + assert(state_file_path != NULL); + + g_debug("Loading state file %s", state_file_path); + + TextFile file(state_file_path); + if (file.HasFailed()) { + g_warning("failed to open %s: %s", + state_file_path, g_strerror(errno)); + return; + } + + const char *line; + while ((line = file.ReadLine()) != NULL) { + success = read_sw_volume_state(line) || + audio_output_state_read(line) || + playlist_state_restore(line, file, &g_playlist, pc); + if (!success) + g_warning("Unrecognized line in state file: %s", line); + } + + 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, pc); +} + +/** + * This function is called every 5 minutes by the GLib main loop, and + * saves the state file. + */ +static gboolean +timer_save_state_file(gpointer data) +{ + struct player_control *pc = (struct player_control *)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, pc)) + /* nothing has changed - don't save the state file, + don't spin up the hard disk */ + return true; + + state_file_write(pc); + return true; +} + +void +state_file_init(const char *path, struct player_control *pc) +{ + assert(state_file_path == NULL); + + if (path == NULL) + return; + + state_file_path = g_strdup(path); + state_file_read(pc); + + save_state_source_id = g_timeout_add_seconds(5 * 60, + timer_save_state_file, + pc); +} + +void +state_file_finish(struct player_control *pc) +{ + 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); + + state_file_write(pc); + + g_free(state_file_path); +} |