conky/libmpdclient.h

/* libmpdclient
   (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
   This project's homepage is: http://www.musicpd.org
  
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
                                                                                
   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
                                                                                
   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
                                                                                
   - Neither the name of the Music Player Daemon nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
                                                                                
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef LIBMPDCLIENT_H
#define LIBMPDCLIENT_H

#include <sys/time.h>

#define MPD_BUFFER_MAX_LENGTH	50000
#define MPD_WELCOME_MESSAGE	"OK MPD "

#define MPD_ERROR_TIMEOUT	10	/* timeout trying to talk to mpd */
#define MPD_ERROR_SYSTEM	11	/* system error */
#define MPD_ERROR_UNKHOST	12	/* unknown host */
#define MPD_ERROR_CONNPORT	13	/* problems connecting to port on host */
#define MPD_ERROR_NOTMPD	14	/* mpd not running on port at host */
#define MPD_ERROR_NORESPONSE	15	/* no response on attempting to connect */
#define MPD_ERROR_SENDING	16	/* error sending command */
#define MPD_ERROR_CONNCLOSED	17	/* connection closed by mpd */
#define MPD_ERROR_ACK		18	/* ACK returned! */
#define MPD_ERROR_BUFFEROVERRUN	19	/* Buffer was overrun! */

#define MPD_ACK_ERROR_UNK	-1
#define MPD_ERROR_AT_UNK	-1

#define MPD_ACK_ERROR_NOT_LIST			1
#define MPD_ACK_ERROR_ARG			2
#define MPD_ACK_ERROR_PASSWORD			3
#define MPD_ACK_ERROR_PERMISSION		4
#define MPD_ACK_ERROR_UNKNOWN_CMD		5

#define MPD_ACK_ERROR_NO_EXIST			50
#define MPD_ACK_ERROR_PLAYLIST_MAX		51
#define MPD_ACK_ERROR_SYSTEM			52
#define MPD_ACK_ERROR_PLAYLIST_LOAD		53
#define MPD_ACK_ERROR_UPDATE_ALREADY		54
#define MPD_ACK_ERROR_PLAYER_SYNC		55
#define MPD_ACK_ERROR_EXIST			56

#ifdef __cplusplus
extern "C" {
#endif

/* internal stuff don't touch this struct */
	typedef struct _mpd_ReturnElement {
		char *name;
		char *value;
	} mpd_ReturnElement;

/* mpd_Connection
 * holds info about connection to mpd
 * use error, and errorStr to detect errors
 */
	typedef struct _mpd_Connection {
		/* use this to check the version of mpd */
		int version[3];
		/* IMPORTANT, you want to get the error messages from here */
		char errorStr[MPD_BUFFER_MAX_LENGTH + 1];
		int errorCode;
		int errorAt;
		/* this will be set to MPD_ERROR_* if there is an error, 0 if not */
		int error;
		/* DON'T TOUCH any of the rest of this stuff */
		int sock;
		char buffer[MPD_BUFFER_MAX_LENGTH + 1];
		int buflen;
		int bufstart;
		int doneProcessing;
		int listOks;
		int doneListOk;
		int commandList;
		mpd_ReturnElement *returnElement;
		struct timeval timeout;
	} mpd_Connection;

/* mpd_newConnection
 * use this to open a new connection
 * you should use mpd_closeConnection, when your done with the connection,
 * even if an error has occurred
 * _timeout_ is the connection timeout period in seconds
 */
	mpd_Connection *mpd_newConnection(const char *host, int port,
					  float timeout);

	void mpd_setConnectionTimeout(mpd_Connection * connection,
				      float timeout);

/* mpd_closeConnection
 * use this to close a connection and free'ing subsequent memory
 */
	void mpd_closeConnection(mpd_Connection * connection);

/* mpd_clearError
 * clears error
 */
	void mpd_clearError(mpd_Connection * connection);

/* STATUS STUFF */

/* use these with status.state to determine what state the player is in */
#define MPD_STATUS_STATE_UNKNOWN	0
#define MPD_STATUS_STATE_STOP		1
#define MPD_STATUS_STATE_PLAY		2
#define MPD_STATUS_STATE_PAUSE		3

/* us this with status.volume to determine if mpd has volume support */
#define MPD_STATUS_NO_VOLUME		-1

/* mpd_Status
 * holds info return from status command
 */
	typedef struct mpd_Status {
		/* 0-100, or MPD_STATUS_NO_VOLUME when there is no volume support */
		int volume;
		/* 1 if repeat is on, 0 otherwise */
		int repeat;
		/* 1 if random is on, 0 otherwise */
		int random;
		/* playlist length */
		int playlistLength;
		/* playlist, use this to determine when the playlist has changed */
		long long playlist;
		/* use with MPD_STATUS_STATE_* to determine state of player */
		int state;
		/* crossfade setting in seconds */
		int crossfade;
		/* if a song is currently selected (always the case when state is
		 * PLAY or PAUSE), this is the position of the currently
		 * playing song in the playlist, beginning with 0
		 */
		int song;
		/* Song ID of the currently selected song */
		int songid;
		/* time in seconds that have elapsed in the currently playing/paused
		 * song
		 */
		int elapsedTime;
		/* length in seconds of the currently playing/paused song */
		int totalTime;
		/* current bit rate in kbs */
		int bitRate;
		/* audio sample rate */
		unsigned int sampleRate;
		/* audio bits */
		int bits;
		/* audio channels */
		int channels;
		/* 1 if mpd is updating, 0 otherwise */
		int updatingDb;
		/* error */
		char *error;
	} mpd_Status;

	void mpd_sendStatusCommand(mpd_Connection * connection);

/* mpd_getStatus
 * returns status info, be sure to free it with mpd_freeStatus()
 * call this after mpd_sendStatusCommand()
 */
	mpd_Status *mpd_getStatus(mpd_Connection * connection);

/* mpd_freeStatus
 * free's status info malloc'd and returned by mpd_getStatus
 */
	void mpd_freeStatus(mpd_Status * status);

	typedef struct _mpd_Stats {
		int numberOfArtists;
		int numberOfAlbums;
		int numberOfSongs;
		unsigned long uptime;
		unsigned long dbUpdateTime;
		unsigned long playTime;
		unsigned long dbPlayTime;
	} mpd_Stats;

	void mpd_sendStatsCommand(mpd_Connection * connection);

	mpd_Stats *mpd_getStats(mpd_Connection * connection);

	void mpd_freeStats(mpd_Stats * stats);

/* SONG STUFF */

#define MPD_SONG_NO_TIME	-1
#define MPD_SONG_NO_NUM		-1
#define MPD_SONG_NO_ID		-1

/* mpd_Song
 * for storing song info returned by mpd
 */
	typedef struct _mpd_Song {
		/* filename of song */
		char *file;
		/* artist, maybe NULL if there is no tag */
		char *artist;
		/* title, maybe NULL if there is no tag */
		char *title;
		/* album, maybe NULL if there is no tag */
		char *album;
		/* track, maybe NULL if there is no tag */
		char *track;
		/* name, maybe NULL if there is no tag; it's the name of the current
		 * song, f.e. the icyName of the stream */
		char *name;
		/* length of song in seconds, check that it is not MPD_SONG_NO_TIME  */
		int time;
		/* if plchanges/playlistinfo/playlistid used, is the position of the 
		 * song in the playlist */
		int pos;
		/* song id for a song in the playlist */
		int id;
	} mpd_Song;

/* mpd_newSong
 * use to allocate memory for a new mpd_Song
 * file, artist, etc all initialized to NULL
 * if your going to assign values to file, artist, etc
 * be sure to malloc or strdup the memory
 * use mpd_freeSong to free the memory for the mpd_Song, it will also
 * free memory for file, artist, etc, so don't do it yourself
 */
	mpd_Song *mpd_newSong();

/* mpd_freeSong
 * use to free memory allocated by mpd_newSong
 * also it will free memory pointed to by file, artist, etc, so be careful
 */
	void mpd_freeSong(mpd_Song * song);

/* mpd_songDup
 * works like strDup, but for a mpd_Song
 */
	mpd_Song *mpd_songDup(mpd_Song * song);

/* DIRECTORY STUFF */

/* mpd_Directory
 * used to store info fro directory (right now that just the path)
 */
	typedef struct _mpd_Directory {
		char *path;
	} mpd_Directory;

/* mpd_newDirectory
 * allocates memory for a new directory
 * use mpd_freeDirectory to free this memory
 */
	mpd_Directory *mpd_newDirectory();

/* mpd_freeDirectory
 * used to free memory allocated with mpd_newDirectory, and it frees
 * path of mpd_Directory, so be careful
 */
	void mpd_freeDirectory(mpd_Directory * directory);

/* mpd_directoryDup
 * works like strdup, but for mpd_Directory
 */
	mpd_Directory *mpd_directoryDup(mpd_Directory * directory);

/* PLAYLISTFILE STUFF */

/* mpd_PlaylistFile
 * stores info about playlist file returned by lsinfo
 */
	typedef struct _mpd_PlaylistFile {
		char *path;
	} mpd_PlaylistFile;

/* mpd_newPlaylistFile
 * allocates memory for new mpd_PlaylistFile, path is set to NULL
 * free this memory with mpd_freePlaylistFile
 */
	mpd_PlaylistFile *mpd_newPlaylistFile();

/* mpd_freePlaylist
 * free memory allocated for freePlaylistFile, will also free
 * path, so be careful
 */
	void mpd_freePlaylistFile(mpd_PlaylistFile * playlist);

/* mpd_playlistFileDup
 * works like strdup, but for mpd_PlaylistFile
 */
	mpd_PlaylistFile *mpd_playlistFileDup(mpd_PlaylistFile * playlist);

/* INFO ENTITY STUFF */

/* the type of entity returned from one of the commands that generates info
 * use in conjunction with mpd_InfoEntity.type
 */
#define MPD_INFO_ENTITY_TYPE_DIRECTORY		0
#define MPD_INFO_ENTITY_TYPE_SONG		1
#define MPD_INFO_ENTITY_TYPE_PLAYLISTFILE	2

/* mpd_InfoEntity
 * stores info on stuff returned info commands
 */
	typedef struct mpd_InfoEntity {
		/* the type of entity, use with MPD_INFO_ENTITY_TYPE_* to determine
		 * what this entity is (song, directory, etc...)
		 */
		int type;
		/* the actual data you want, mpd_Song, mpd_Directory, etc */
		union {
			mpd_Directory *directory;
			mpd_Song *song;
			mpd_PlaylistFile *playlistFile;
		} info;
	} mpd_InfoEntity;

	mpd_InfoEntity *mpd_newInfoEntity();

	void mpd_freeInfoEntity(mpd_InfoEntity * entity);

/* INFO COMMANDS AND STUFF */

/* use this function to loop over after calling Info/Listall functions */
	mpd_InfoEntity *mpd_getNextInfoEntity(mpd_Connection * connection);

/* fetches the currently seeletect song (the song referenced by status->song
 * and status->songid*/
	void mpd_sendCurrentSongCommand(mpd_Connection * connection);

/* songNum of -1, means to display the whole list */
	void mpd_sendPlaylistInfoCommand(mpd_Connection * connection,
					 int songNum);

/* use this to get the changes in the playlist since version _playlist_ */
	void mpd_sendPlChangesCommand(mpd_Connection * connection,
				      long long playlist);

/* recursivel fetches all songs/dir/playlists in "dir* (no metadata is 
 * returned) */
	void mpd_sendListallCommand(mpd_Connection * connection,
				    const char *dir);

/* same as sendListallCommand, but also metadata is returned */
	void mpd_sendListallInfoCommand(mpd_Connection * connection,
					const char *dir);

/* non-recursive version of ListallInfo */
	void mpd_sendLsInfoCommand(mpd_Connection * connection,
				   const char *dir);

#define MPD_TABLE_ARTIST	0
#define MPD_TABLE_ALBUM		1
#define MPD_TABLE_TITLE		2
#define MPD_TABLE_FILENAME	3

	void mpd_sendSearchCommand(mpd_Connection * connection, int table,
				   const char *str);

	void mpd_sendFindCommand(mpd_Connection * connection, int table,
				 const char *str);

/* LIST TAG COMMANDS */

/* use this function fetch next artist entry, be sure to free the returned 
 * string.  NULL means there are no more.  Best used with sendListArtists
 */
	char *mpd_getNextArtist(mpd_Connection * connection);

	char *mpd_getNextAlbum(mpd_Connection * connection);

/* list artist or albums by artist, arg1 should be set to the artist if
 * listing albums by a artist, otherwise NULL for listing all artists or albums
 */
	void mpd_sendListCommand(mpd_Connection * connection, int table,
				 const char *arg1);

/* SIMPLE COMMANDS */

	void mpd_sendAddCommand(mpd_Connection * connection,
				const char *file);

	void mpd_sendDeleteCommand(mpd_Connection * connection,
				   int songNum);

	void mpd_sendDeleteIdCommand(mpd_Connection * connection,
				     int songNum);

	void mpd_sendSaveCommand(mpd_Connection * connection,
				 const char *name);

	void mpd_sendLoadCommand(mpd_Connection * connection,
				 const char *name);

	void mpd_sendRmCommand(mpd_Connection * connection,
			       const char *name);

	void mpd_sendShuffleCommand(mpd_Connection * connection);

	void mpd_sendClearCommand(mpd_Connection * connection);

/* use this to start playing at the beginning, useful when in random mode */
#define MPD_PLAY_AT_BEGINNING	-1

	void mpd_sendPlayCommand(mpd_Connection * connection, int songNum);

	void mpd_sendPlayIdCommand(mpd_Connection * connection,
				   int songNum);

	void mpd_sendStopCommand(mpd_Connection * connection);

	void mpd_sendPauseCommand(mpd_Connection * connection,
				  int pauseMode);

	void mpd_sendNextCommand(mpd_Connection * connection);

	void mpd_sendPrevCommand(mpd_Connection * connection);

	void mpd_sendMoveCommand(mpd_Connection * connection, int from,
				 int to);

	void mpd_sendMoveIdCommand(mpd_Connection * connection, int from,
				   int to);

	void mpd_sendSwapCommand(mpd_Connection * connection, int song1,
				 int song2);

	void mpd_sendSwapIdCommand(mpd_Connection * connection, int song1,
				   int song2);

	void mpd_sendSeekCommand(mpd_Connection * connection, int song,
				 int time);

	void mpd_sendSeekIdCommand(mpd_Connection * connection, int song,
				   int time);

	void mpd_sendRepeatCommand(mpd_Connection * connection,
				   int repeatMode);

	void mpd_sendRandomCommand(mpd_Connection * connection,
				   int randomMode);

	void mpd_sendSetvolCommand(mpd_Connection * connection,
				   int volumeChange);

/* WARNING: don't use volume command, its depreacted */
	void mpd_sendVolumeCommand(mpd_Connection * connection,
				   int volumeChange);

	void mpd_sendCrossfadeCommand(mpd_Connection * connection,
				      int seconds);

	void mpd_sendUpdateCommand(mpd_Connection * connection,
				   char *path);

/* returns the update job id, call this after a update command*/
	int mpd_getUpdateId(mpd_Connection * connection);

	void mpd_sendPasswordCommand(mpd_Connection * connection,
				     const char *pass);

/* after executing a command, when your done with it to get its status
 * (you want to check connection->error for an error)
 */
	void mpd_finishCommand(mpd_Connection * connection);

/* command list stuff, use this to do things like add files very quickly */
	void mpd_sendCommandListBegin(mpd_Connection * connection);

	void mpd_sendCommandListOkBegin(mpd_Connection * connection);

	void mpd_sendCommandListEnd(mpd_Connection * connection);

/* advance to the next listOk 
 * returns 0 if advanced to the next list_OK,
 * returns -1 if it advanced to an OK or ACK */
	int mpd_nextListOkCommand(mpd_Connection * connection);

#ifdef __cplusplus
}
#endif
#endif