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-rw-r--r--src/queue/PlaylistState.cxx244
1 files changed, 244 insertions, 0 deletions
diff --git a/src/queue/PlaylistState.cxx b/src/queue/PlaylistState.cxx
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+++ b/src/queue/PlaylistState.cxx
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+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+/*
+ * Saving and loading the playlist to/from the state file.
+ *
+ */
+
+#include "config.h"
+#include "PlaylistState.hxx"
+#include "PlaylistError.hxx"
+#include "Playlist.hxx"
+#include "queue/QueueSave.hxx"
+#include "fs/io/TextFile.hxx"
+#include "fs/io/BufferedOutputStream.hxx"
+#include "PlayerControl.hxx"
+#include "config/ConfigGlobal.hxx"
+#include "config/ConfigOption.hxx"
+#include "fs/Limits.hxx"
+#include "util/CharUtil.hxx"
+#include "util/StringUtil.hxx"
+#include "Log.hxx"
+
+#include <string.h>
+#include <stdlib.h>
+
+#define PLAYLIST_STATE_FILE_STATE "state: "
+#define PLAYLIST_STATE_FILE_RANDOM "random: "
+#define PLAYLIST_STATE_FILE_REPEAT "repeat: "
+#define PLAYLIST_STATE_FILE_SINGLE "single: "
+#define PLAYLIST_STATE_FILE_CONSUME "consume: "
+#define PLAYLIST_STATE_FILE_CURRENT "current: "
+#define PLAYLIST_STATE_FILE_TIME "time: "
+#define PLAYLIST_STATE_FILE_CROSSFADE "crossfade: "
+#define PLAYLIST_STATE_FILE_MIXRAMPDB "mixrampdb: "
+#define PLAYLIST_STATE_FILE_MIXRAMPDELAY "mixrampdelay: "
+#define PLAYLIST_STATE_FILE_PLAYLIST_BEGIN "playlist_begin"
+#define PLAYLIST_STATE_FILE_PLAYLIST_END "playlist_end"
+
+#define PLAYLIST_STATE_FILE_STATE_PLAY "play"
+#define PLAYLIST_STATE_FILE_STATE_PAUSE "pause"
+#define PLAYLIST_STATE_FILE_STATE_STOP "stop"
+
+#define PLAYLIST_BUFFER_SIZE 2*MPD_PATH_MAX
+
+void
+playlist_state_save(BufferedOutputStream &os, const struct playlist &playlist,
+ PlayerControl &pc)
+{
+ const auto player_status = pc.GetStatus();
+
+ os.Write(PLAYLIST_STATE_FILE_STATE);
+
+ if (playlist.playing) {
+ switch (player_status.state) {
+ case PlayerState::PAUSE:
+ os.Write(PLAYLIST_STATE_FILE_STATE_PAUSE "\n");
+ break;
+ default:
+ os.Write(PLAYLIST_STATE_FILE_STATE_PLAY "\n");
+ }
+ os.Format(PLAYLIST_STATE_FILE_CURRENT "%i\n",
+ playlist.queue.OrderToPosition(playlist.current));
+ os.Format(PLAYLIST_STATE_FILE_TIME "%f\n",
+ player_status.elapsed_time.ToDoubleS());
+ } else {
+ os.Write(PLAYLIST_STATE_FILE_STATE_STOP "\n");
+
+ if (playlist.current >= 0)
+ os.Format(PLAYLIST_STATE_FILE_CURRENT "%i\n",
+ playlist.queue.OrderToPosition(playlist.current));
+ }
+
+ os.Format(PLAYLIST_STATE_FILE_RANDOM "%i\n", playlist.queue.random);
+ os.Format(PLAYLIST_STATE_FILE_REPEAT "%i\n", playlist.queue.repeat);
+ os.Format(PLAYLIST_STATE_FILE_SINGLE "%i\n", playlist.queue.single);
+ os.Format(PLAYLIST_STATE_FILE_CONSUME "%i\n", playlist.queue.consume);
+ os.Format(PLAYLIST_STATE_FILE_CROSSFADE "%i\n",
+ (int)pc.GetCrossFade());
+ os.Format(PLAYLIST_STATE_FILE_MIXRAMPDB "%f\n", pc.GetMixRampDb());
+ os.Format(PLAYLIST_STATE_FILE_MIXRAMPDELAY "%f\n",
+ pc.GetMixRampDelay());
+ os.Write(PLAYLIST_STATE_FILE_PLAYLIST_BEGIN "\n");
+ queue_save(os, playlist.queue);
+ os.Write(PLAYLIST_STATE_FILE_PLAYLIST_END "\n");
+}
+
+static void
+playlist_state_load(TextFile &file, const SongLoader &song_loader,
+ struct playlist &playlist)
+{
+ const char *line = file.ReadLine();
+ if (line == nullptr) {
+ LogWarning(playlist_domain, "No playlist in state file");
+ return;
+ }
+
+ while (!StringStartsWith(line, PLAYLIST_STATE_FILE_PLAYLIST_END)) {
+ queue_load_song(file, song_loader, line, playlist.queue);
+
+ line = file.ReadLine();
+ if (line == nullptr) {
+ LogWarning(playlist_domain,
+ "'" PLAYLIST_STATE_FILE_PLAYLIST_END
+ "' not found in state file");
+ break;
+ }
+ }
+
+ playlist.queue.IncrementVersion();
+}
+
+bool
+playlist_state_restore(const char *line, TextFile &file,
+ const SongLoader &song_loader,
+ struct playlist &playlist, PlayerControl &pc)
+{
+ int current = -1;
+ SongTime seek_time = SongTime::zero();
+ bool random_mode = false;
+
+ if (!StringStartsWith(line, PLAYLIST_STATE_FILE_STATE))
+ return false;
+
+ line += sizeof(PLAYLIST_STATE_FILE_STATE) - 1;
+
+ PlayerState state;
+ if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PLAY) == 0)
+ state = PlayerState::PLAY;
+ else if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PAUSE) == 0)
+ state = PlayerState::PAUSE;
+ else
+ state = PlayerState::STOP;
+
+ while ((line = file.ReadLine()) != nullptr) {
+ if (StringStartsWith(line, PLAYLIST_STATE_FILE_TIME)) {
+ double seconds = atof(line + strlen(PLAYLIST_STATE_FILE_TIME));
+ seek_time = SongTime::FromS(seconds);
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_REPEAT)) {
+ playlist.SetRepeat(pc,
+ strcmp(&(line[strlen(PLAYLIST_STATE_FILE_REPEAT)]),
+ "1") == 0);
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_SINGLE)) {
+ playlist.SetSingle(pc,
+ strcmp(&(line[strlen(PLAYLIST_STATE_FILE_SINGLE)]),
+ "1") == 0);
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_CONSUME)) {
+ playlist.SetConsume(strcmp(&(line[strlen(PLAYLIST_STATE_FILE_CONSUME)]),
+ "1") == 0);
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_CROSSFADE)) {
+ pc.SetCrossFade(atoi(line + strlen(PLAYLIST_STATE_FILE_CROSSFADE)));
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_MIXRAMPDB)) {
+ pc.SetMixRampDb(atof(line + strlen(PLAYLIST_STATE_FILE_MIXRAMPDB)));
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_MIXRAMPDELAY)) {
+ const char *p = line + strlen(PLAYLIST_STATE_FILE_MIXRAMPDELAY);
+
+ /* this check discards "nan" which was used
+ prior to MPD 0.18 */
+ if (IsDigitASCII(*p))
+ pc.SetMixRampDelay(atof(p));
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_RANDOM)) {
+ random_mode =
+ strcmp(line + strlen(PLAYLIST_STATE_FILE_RANDOM),
+ "1") == 0;
+ } else if (StringStartsWith(line, PLAYLIST_STATE_FILE_CURRENT)) {
+ current = atoi(&(line
+ [strlen
+ (PLAYLIST_STATE_FILE_CURRENT)]));
+ } else if (StringStartsWith(line,
+ PLAYLIST_STATE_FILE_PLAYLIST_BEGIN)) {
+ playlist_state_load(file, song_loader, playlist);
+ }
+ }
+
+ playlist.SetRandom(pc, random_mode);
+
+ if (!playlist.queue.IsEmpty()) {
+ if (!playlist.queue.IsValidPosition(current))
+ current = 0;
+
+ if (state == PlayerState::PLAY &&
+ config_get_bool(CONF_RESTORE_PAUSED, false))
+ /* the user doesn't want MPD to auto-start
+ playback after startup; fall back to
+ "pause" */
+ state = PlayerState::PAUSE;
+
+ /* enable all devices for the first time; this must be
+ called here, after the audio output states were
+ restored, before playback begins */
+ if (state != PlayerState::STOP)
+ pc.UpdateAudio();
+
+ if (state == PlayerState::STOP /* && config_option */)
+ playlist.current = current;
+ else if (seek_time.count() == 0)
+ playlist.PlayPosition(pc, current);
+ else
+ playlist.SeekSongPosition(pc, current, seek_time);
+
+ if (state == PlayerState::PAUSE)
+ pc.Pause();
+ }
+
+ return true;
+}
+
+unsigned
+playlist_state_get_hash(const playlist &playlist,
+ PlayerControl &pc)
+{
+ const auto player_status = pc.GetStatus();
+
+ return playlist.queue.version ^
+ (player_status.state != PlayerState::STOP
+ ? (player_status.elapsed_time.ToS() << 8)
+ : 0) ^
+ (playlist.current >= 0
+ ? (playlist.queue.OrderToPosition(playlist.current) << 16)
+ : 0) ^
+ ((int)pc.GetCrossFade() << 20) ^
+ (unsigned(player_status.state) << 24) ^
+ (playlist.queue.random << 27) ^
+ (playlist.queue.repeat << 28) ^
+ (playlist.queue.single << 29) ^
+ (playlist.queue.consume << 30) ^
+ (playlist.queue.random << 31);
+}