include/SDL_cdrom.h

/*
    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 */