text: /*
   * SDL_cdrom.h
   *
   * Written by
   *  Sam Lantinga <slouken@libsdl.org>
   *
   * This file is a modified SDL header.
   *
   * This file is part of VICE, the Versatile Commodore Emulator.
   * See README for copyright notice.
   *
   *  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., 59 Temple Place, Suite 330, Boston, MA
   *  02111-1307  USA.
   *
   */
  
  /**
   *  @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 */
  