/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2012 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

/**

 *  @file SDL_cdrom.h

 *  This is the CD-audio control API for Simple DirectMedia Layer

 */

#ifndef _SDL_cdrom_h

#define _SDL_cdrom_h

#include "SDL_stdinc.h"

#include "SDL_error.h"

#include "begin_code.h"

/* Set up for C function definitions, even when using C++ */

#ifdef __cplusplus

extern "C" {

#endif

/**

 *  @file SDL_cdrom.h

 *  In order to use these functions, SDL_Init() must have been called

 *  with the SDL_INIT_CDROM flag.  This causes SDL to scan the system

 *  for CD-ROM drives, and load appropriate drivers.

 */

/** The maximum number of CD-ROM tracks on a disk */

#define SDL_MAX_TRACKS	99

/** @name Track Types

 *  The types of CD-ROM track possible

 */

/*@{*/

#define SDL_AUDIO_TRACK	0x00

#define SDL_DATA_TRACK	0x04

/*@}*/

/** The possible states which a CD-ROM drive can be in. */

typedef enum {

	CD_TRAYEMPTY,

	CD_STOPPED,

	CD_PLAYING,

	CD_PAUSED,

	CD_ERROR = -1

} CDstatus;

/** Given a status, returns true if there's a disk in the drive */

#define CD_INDRIVE(status)	((int)(status) > 0)

typedef struct SDL_CDtrack {

	Uint8 id;		/**< Track number */

	Uint8 type;		/**< Data or audio track */

	Uint16 unused;

	Uint32 length;		/**< Length, in frames, of this track */

	Uint32 offset;		/**< Offset, in frames, from start of disk */

} SDL_CDtrack;

/** This structure is only current as of the last call to SDL_CDStatus() */

typedef struct SDL_CD {

	int id;			/**< Private drive identifier */

	CDstatus status;	/**< Current drive status */

	/** The rest of this structure is only valid if there's a CD in drive */

        /*@{*/

	int numtracks;		/**< Number of tracks on disk */

	int cur_track;		/**< Current track position */

	int cur_frame;		/**< Current frame offset within current track */

	SDL_CDtrack track[SDL_MAX_TRACKS+1];

        /*@}*/

} SDL_CD;

/** @name Frames / MSF Conversion Functions

 *  Conversion functions from frames to Minute/Second/Frames and vice versa

 */

/*@{*/

#define CD_FPS	75

#define FRAMES_TO_MSF(f, M,S,F)	{					\

	int value = f;							\

	*(F) = value%CD_FPS;						\

	value /= CD_FPS;						\

	*(S) = value%60;						\

	value /= 60;							\

	*(M) = value;							\

}

#define MSF_TO_FRAMES(M, S, F)	((M)*60*CD_FPS+(S)*CD_FPS+(F))

/*@}*/

/* CD-audio API functions: */

/**

 *  Returns the number of CD-ROM drives on the system, or -1 if

 *  SDL_Init() has not been called with the SDL_INIT_CDROM flag.

 */

extern DECLSPEC int SDLCALL SDL_CDNumDrives(void);

/**

 *  Returns a human-readable, system-dependent identifier for the CD-ROM.

 *  Example:

 *   - "/dev/cdrom"

 *   - "E:"

 *   - "/dev/disk/ide/1/master"

 */

extern DECLSPEC const char * SDLCALL SDL_CDName(int drive);

/**

 *  Opens a CD-ROM drive for access.  It returns a drive handle on success,

 *  or NULL if the drive was invalid or busy.  This newly opened CD-ROM

 *  becomes the default CD used when other CD functions are passed a NULL

 *  CD-ROM handle.

 *  Drives are numbered starting with 0.  Drive 0 is the system default CD-ROM.

 */

extern DECLSPEC SDL_CD * SDLCALL SDL_CDOpen(int drive);

/**

 *  This function returns the current status of the given drive.

 *  If the drive has a CD in it, the table of contents of the CD and current

 *  play position of the CD will be stored in the SDL_CD structure.

 */

extern DECLSPEC CDstatus SDLCALL SDL_CDStatus(SDL_CD *cdrom);

/**

 *  Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks'

 *  tracks and 'nframes' frames.  If both 'ntrack' and 'nframe' are 0, play 

 *  until the end of the CD.  This function will skip data tracks.

 *  This function should only be called after calling SDL_CDStatus() to 

 *  get track information about the CD.

 *  For example:

 *      @code

 *	// Play entire CD:

 *	if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )

 *		SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);

 *	// Play last track:

 *	if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) {

 *		SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0);

 *	}

 *	// Play first and second track and 10 seconds of third track:

 *	if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )

 *		SDL_CDPlayTracks(cdrom, 0, 0, 2, 10);

 *      @endcode

 *

 *  @return This function returns 0, or -1 if there was an error.

 */

extern DECLSPEC int SDLCALL SDL_CDPlayTracks(SDL_CD *cdrom,

		int start_track, int start_frame, int ntracks, int nframes);

/**

 *  Play the given CD starting at 'start' frame for 'length' frames.

 *  @return It returns 0, or -1 if there was an error.

 */

extern DECLSPEC int SDLCALL SDL_CDPlay(SDL_CD *cdrom, int start, int length);

/** Pause play

 *  @return returns 0, or -1 on error

 */

extern DECLSPEC int SDLCALL SDL_CDPause(SDL_CD *cdrom);

/** Resume play

 *  @return returns 0, or -1 on error

 */

extern DECLSPEC int SDLCALL SDL_CDResume(SDL_CD *cdrom);

/** Stop play

 *  @return returns 0, or -1 on error

 */

extern DECLSPEC int SDLCALL SDL_CDStop(SDL_CD *cdrom);

/** Eject CD-ROM

 *  @return returns 0, or -1 on error

 */

extern DECLSPEC int SDLCALL SDL_CDEject(SDL_CD *cdrom);

/** Closes the handle for the CD-ROM drive */

extern DECLSPEC void SDLCALL SDL_CDClose(SDL_CD *cdrom);

/* Ends C function definitions when using C++ */

#ifdef __cplusplus

}

#endif

#include "close_code.h"

#endif /* _SDL_video_h */