1 files changed, 256 insertions, 0 deletions
diff --git a/src/Playlist.hxx b/src/Playlist.hxx
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+/*
+ * 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.
+ */
+
+#ifndef MPD_PLAYLIST_HXX
+#define MPD_PLAYLIST_HXX
+
+#include "Queue.hxx"
+#include "playlist_error.h"
+
+#include <stdbool.h>
+
+struct player_control;
+
+struct playlist {
+	/**
+	 * The song queue - it contains the "real" playlist.
+	 */
+	struct queue queue;
+
+	/**
+	 * This value is true if the player is currently playing (or
+	 * should be playing).
+	 */
+	bool playing;
+
+	/**
+	 * If true, then any error is fatal; if false, MPD will
+	 * attempt to play the next song on non-fatal errors.  During
+	 * seeking, this flag is set.
+	 */
+	bool stop_on_error;
+
+	/**
+	 * Number of errors since playback was started.  If this
+	 * number exceeds the length of the playlist, MPD gives up,
+	 * because all songs have been tried.
+	 */
+	unsigned error_count;
+
+	/**
+	 * The "current song pointer".  This is the song which is
+	 * played when we get the "play" command.  It is also the song
+	 * which is currently being played.
+	 */
+	int current;
+
+	/**
+	 * The "next" song to be played, when the current one
+	 * finishes.  The decoder thread may start decoding and
+	 * buffering it, while the "current" song is still playing.
+	 *
+	 * This variable is only valid if #playing is true.
+	 */
+	int queued;
+
+	playlist(unsigned max_length)
+		:queue(max_length), playing(false), current(-1), queued(-1) {
+	}
+
+	~playlist() {
+	}
+
+	uint32_t GetVersion() const {
+		return queue.version;
+	}
+
+	unsigned GetLength() const {
+		return queue.GetLength();
+	}
+
+	unsigned PositionToId(unsigned position) const {
+		return queue.PositionToId(position);
+	}
+
+	gcc_pure
+	int GetCurrentPosition() const;
+
+	gcc_pure
+	int GetNextPosition() const;
+
+	/**
+	 * Returns the song object which is currently queued.  Returns
+	 * none if there is none (yet?) or if MPD isn't playing.
+	 */
+	gcc_pure
+	const struct song *GetQueuedSong() const;
+
+	/**
+	 * This is the "PLAYLIST" event handler.  It is invoked by the
+	 * player thread whenever it requests a new queued song, or
+	 * when it exits.
+	 */
+	void SyncWithPlayer(player_control &pc);
+
+protected:
+	/**
+	 * Called by all editing methods after a modification.
+	 * Updates the queue version and emits #IDLE_PLAYLIST.
+	 */
+	void OnModified();
+
+	/**
+	 * Updates the "queued song".  Calculates the next song
+	 * according to the current one (if MPD isn't playing, it
+	 * takes the first song), and queues this song.  Clears the
+	 * old queued song if there was one.
+	 *
+	 * @param prev the song which was previously queued, as
+	 * determined by playlist_get_queued_song()
+	 */
+	void UpdateQueuedSong(player_control &pc, const song *prev);
+
+public:
+	void Clear(player_control &pc);
+
+	void TagChanged();
+
+	void FullIncrementVersions();
+
+	enum playlist_result AppendSong(player_control &pc,
+					struct song *song,
+					unsigned *added_id=nullptr);
+
+	/**
+	 * Appends a local file (outside the music database) to the
+	 * playlist.
+	 *
+	 * Note: the caller is responsible for checking permissions.
+	 */
+	enum playlist_result AppendFile(player_control &pc,
+					const char *path_utf8,
+					unsigned *added_id=nullptr);
+
+	enum playlist_result AppendURI(player_control &pc,
+				       const char *uri_utf8,
+				       unsigned *added_id=nullptr);
+
+protected:
+	void DeleteInternal(player_control &pc,
+			    unsigned song, const struct song **queued_p);
+
+public:
+	enum playlist_result DeletePosition(player_control &pc,
+					    unsigned position);
+
+	enum playlist_result DeleteOrder(player_control &pc,
+					 unsigned order) {
+		return DeletePosition(pc, queue.OrderToPosition(order));
+	}
+
+	enum playlist_result DeleteId(player_control &pc, unsigned id);
+
+	/**
+	 * Deletes a range of songs from the playlist.
+	 *
+	 * @param start the position of the first song to delete
+	 * @param end the position after the last song to delete
+	 */
+	enum playlist_result DeleteRange(player_control &pc,
+					 unsigned start, unsigned end);
+
+	void DeleteSong(player_control &pc, const song &song);
+
+	void Shuffle(player_control &pc, unsigned start, unsigned end);
+
+	enum playlist_result MoveRange(player_control &pc,
+				       unsigned start, unsigned end, int to);
+
+	enum playlist_result MoveId(player_control &pc, unsigned id, int to);
+
+	enum playlist_result SwapPositions(player_control &pc,
+					   unsigned song1, unsigned song2);
+
+	enum playlist_result SwapIds(player_control &pc,
+				     unsigned id1, unsigned id2);
+
+	enum playlist_result SetPriorityRange(player_control &pc,
+					      unsigned start_position,
+					      unsigned end_position,
+					      uint8_t priority);
+
+	enum playlist_result SetPriorityId(player_control &pc,
+					   unsigned song_id, uint8_t priority);
+
+	void Stop(player_control &pc);
+
+	enum playlist_result PlayPosition(player_control &pc, int position);
+
+	void PlayOrder(player_control &pc, int order);
+
+	enum playlist_result PlayId(player_control &pc, int id);
+
+	void PlayNext(player_control &pc);
+
+	void PlayPrevious(player_control &pc);
+
+	enum playlist_result SeekSongPosition(player_control &pc,
+					      unsigned song_position,
+					      float seek_time);
+
+	enum playlist_result SeekSongId(player_control &pc,
+					unsigned song_id, float seek_time);
+
+	/**
+	 * Seek within the current song.  Fails if MPD is not currently
+	 * playing.
+	 *
+	 * @param time the time in seconds
+	 * @param relative if true, then the specified time is relative to the
+	 * current position
+	 */
+	enum playlist_result SeekCurrent(player_control &pc,
+					 float seek_time, bool relative);
+
+	bool GetRepeat() const {
+		return queue.repeat;
+	}
+
+	void SetRepeat(player_control &pc, bool new_value);
+
+	bool GetRandom() const {
+		return queue.random;
+	}
+
+	void SetRandom(player_control &pc, bool new_value);
+
+	bool GetSingle() const {
+		return queue.single;
+	}
+
+	void SetSingle(player_control &pc, bool new_value);
+
+	bool GetConsume() const {
+		return queue.consume;
+	}
+
+	void SetConsume(bool new_value);
+};
+
+#endif