include/SDL_cdrom.h

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997-2006 Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Lesser General Public
   7     License as published by the Free Software Foundation; either
   8     version 2.1 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public
  16     License along with this library; if not, write to the Free Software
  17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22
  23 /* This is the CD-audio control API for Simple DirectMedia Layer */
  24
  25 #ifndef _SDL_cdrom_h
  26 #define _SDL_cdrom_h
  27
  28 #include "SDL_stdinc.h"
  29 #include "SDL_error.h"
  30
  31 #include "begin_code.h"
  32 /* Set up for C function definitions, even when using C++ */
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /* In order to use these functions, SDL_Init() must have been called
  38    with the SDL_INIT_CDROM flag.  This causes SDL to scan the system
  39    for CD-ROM drives, and load appropriate drivers.
  40 */
  41
  42 /* The maximum number of CD-ROM tracks on a disk */
  43 #define SDL_MAX_TRACKS  99
  44
  45 /* The types of CD-ROM track possible */
  46 #define SDL_AUDIO_TRACK 0x00
  47 #define SDL_DATA_TRACK  0x04
  48
  49 /* The possible states which a CD-ROM drive can be in. */
  50 typedef enum {
  51         CD_TRAYEMPTY,
  52         CD_STOPPED,
  53         CD_PLAYING,
  54         CD_PAUSED,
  55         CD_ERROR = -1
  56 } CDstatus;
  57
  58 /* Given a status, returns true if there's a disk in the drive */
  59 #define CD_INDRIVE(status)      ((int)(status) > 0)
  60
  61 typedef struct SDL_CDtrack {
  62         Uint8 id;               /* Track number */
  63         Uint8 type;             /* Data or audio track */
  64         Uint16 unused;
  65         Uint32 length;          /* Length, in frames, of this track */
  66         Uint32 offset;          /* Offset, in frames, from start of disk */
  67 } SDL_CDtrack;
  68
  69 /* This structure is only current as of the last call to SDL_CDStatus() */
  70 typedef struct SDL_CD {
  71         int id;                 /* Private drive identifier */
  72         CDstatus status;        /* Current drive status */
  73
  74         /* The rest of this structure is only valid if there's a CD in drive */
  75         int numtracks;          /* Number of tracks on disk */
  76         int cur_track;          /* Current track position */
  77         int cur_frame;          /* Current frame offset within current track */
  78         SDL_CDtrack track[SDL_MAX_TRACKS+1];
  79 } SDL_CD;
  80
  81 /* Conversion functions from frames to Minute/Second/Frames and vice versa */
  82 #define CD_FPS  75
  83 #define FRAMES_TO_MSF(f, M,S,F) {                                       \
  84         int value = f;                                                  \
  85         *(F) = value%CD_FPS;                                            \
  86         value /= CD_FPS;                                                \
  87         *(S) = value%60;                                                \
  88         value /= 60;                                                    \
  89         *(M) = value;                                                   \
  90 }
  91 #define MSF_TO_FRAMES(M, S, F)  ((M)*60*CD_FPS+(S)*CD_FPS+(F))
  92
  93 /* CD-audio API functions: */
  94
  95 /* Returns the number of CD-ROM drives on the system, or -1 if
  96    SDL_Init() has not been called with the SDL_INIT_CDROM flag.
  97  */
  98 extern DECLSPEC int SDLCALL SDL_CDNumDrives(void);
  99
 100 /* Returns a human-readable, system-dependent identifier for the CD-ROM.
 101    Example:
 102         "/dev/cdrom"
 103         "E:"
 104         "/dev/disk/ide/1/master"
 105 */
 106 extern DECLSPEC const char * SDLCALL SDL_CDName(int drive);
 107
 108 /* Opens a CD-ROM drive for access.  It returns a drive handle on success,
 109    or NULL if the drive was invalid or busy.  This newly opened CD-ROM
 110    becomes the default CD used when other CD functions are passed a NULL
 111    CD-ROM handle.
 112    Drives are numbered starting with 0.  Drive 0 is the system default CD-ROM.
 113 */
 114 extern DECLSPEC SDL_CD * SDLCALL SDL_CDOpen(int drive);
 115
 116 /* This function returns the current status of the given drive.
 117    If the drive has a CD in it, the table of contents of the CD and current
 118    play position of the CD will be stored in the SDL_CD structure.
 119 */
 120 extern DECLSPEC CDstatus SDLCALL SDL_CDStatus(SDL_CD *cdrom);
 121
 122 /* Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks'
 123    tracks and 'nframes' frames.  If both 'ntrack' and 'nframe' are 0, play
 124    until the end of the CD.  This function will skip data tracks.
 125    This function should only be called after calling SDL_CDStatus() to
 126    get track information about the CD.
 127    For example:
 128         // Play entire CD:
 129         if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
 130                 SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);
 131         // Play last track:
 132         if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) {
 133                 SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0);
 134         }
 135         // Play first and second track and 10 seconds of third track:
 136         if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
 137                 SDL_CDPlayTracks(cdrom, 0, 0, 2, 10);
 138
 139    This function returns 0, or -1 if there was an error.
 140 */
 141 extern DECLSPEC int SDLCALL SDL_CDPlayTracks(SDL_CD *cdrom,
 142                 int start_track, int start_frame, int ntracks, int nframes);
 143
 144 /* Play the given CD starting at 'start' frame for 'length' frames.
 145    It returns 0, or -1 if there was an error.
 146 */
 147 extern DECLSPEC int SDLCALL SDL_CDPlay(SDL_CD *cdrom, int start, int length);
 148
 149 /* Pause play -- returns 0, or -1 on error */
 150 extern DECLSPEC int SDLCALL SDL_CDPause(SDL_CD *cdrom);
 151
 152 /* Resume play -- returns 0, or -1 on error */
 153 extern DECLSPEC int SDLCALL SDL_CDResume(SDL_CD *cdrom);
 154
 155 /* Stop play -- returns 0, or -1 on error */
 156 extern DECLSPEC int SDLCALL SDL_CDStop(SDL_CD *cdrom);
 157
 158 /* Eject CD-ROM -- returns 0, or -1 on error */
 159 extern DECLSPEC int SDLCALL SDL_CDEject(SDL_CD *cdrom);
 160
 161 /* Closes the handle for the CD-ROM drive */
 162 extern DECLSPEC void SDLCALL SDL_CDClose(SDL_CD *cdrom);
 163
 164
 165 /* Ends C function definitions when using C++ */
 166 #ifdef __cplusplus
 167 }
 168 #endif
 169 #include "close_code.h"
 170
 171 #endif /* _SDL_video_h */