1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2004 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Library General Public 7 License as published by the Free Software Foundation; either 8 version 2 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 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this library; if not, write to the Free 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 19 Sam Lantinga 20 slouken (at) libsdl.org 21 */ 22 23 #ifdef SAVE_RCSID 24 static char rcsid = 25 "@(#) $Id: SDL_cdrom.h,v 1.7 2004/07/18 22:57:40 slouken Exp $"; 26 #endif 27 28 /* This is the CD-audio control API for Simple DirectMedia Layer */ 29 30 #ifndef _SDL_cdrom_h 31 #define _SDL_cdrom_h 32 33 #include "SDL_types.h" 34 35 #include "begin_code.h" 36 /* Set up for C function definitions, even when using C++ */ 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /* In order to use these functions, SDL_Init() must have been called 42 with the SDL_INIT_CDROM flag. This causes SDL to scan the system 43 for CD-ROM drives, and load appropriate drivers. 44 */ 45 46 /* The maximum number of CD-ROM tracks on a disk */ 47 #define SDL_MAX_TRACKS 99 48 49 /* The types of CD-ROM track possible */ 50 #define SDL_AUDIO_TRACK 0x00 51 #define SDL_DATA_TRACK 0x04 52 53 /* The possible states which a CD-ROM drive can be in. */ 54 typedef enum { 55 CD_TRAYEMPTY, 56 CD_STOPPED, 57 CD_PLAYING, 58 CD_PAUSED, 59 CD_ERROR = -1 60 } CDstatus; 61 62 /* Given a status, returns true if there's a disk in the drive */ 63 #define CD_INDRIVE(status) ((int)status > 0) 64 65 typedef struct SDL_CDtrack { 66 Uint8 id; /* Track number */ 67 Uint8 type; /* Data or audio track */ 68 Uint16 unused; 69 Uint32 length; /* Length, in frames, of this track */ 70 Uint32 offset; /* Offset, in frames, from start of disk */ 71 } SDL_CDtrack; 72 73 /* This structure is only current as of the last call to SDL_CDStatus() */ 74 typedef struct SDL_CD { 75 int id; /* Private drive identifier */ 76 CDstatus status; /* Current drive status */ 77 78 /* The rest of this structure is only valid if there's a CD in drive */ 79 int numtracks; /* Number of tracks on disk */ 80 int cur_track; /* Current track position */ 81 int cur_frame; /* Current frame offset within current track */ 82 SDL_CDtrack track[SDL_MAX_TRACKS+1]; 83 } SDL_CD; 84 85 /* Conversion functions from frames to Minute/Second/Frames and vice versa */ 86 #define CD_FPS 75 87 #define FRAMES_TO_MSF(f, M,S,F) { \ 88 int value = f; \ 89 *(F) = value%CD_FPS; \ 90 value /= CD_FPS; \ 91 *(S) = value%60; \ 92 value /= 60; \ 93 *(M) = value; \ 94 } 95 #define MSF_TO_FRAMES(M, S, F) ((M)*60*CD_FPS+(S)*CD_FPS+(F)) 96 97 /* CD-audio API functions: */ 98 99 /* Returns the number of CD-ROM drives on the system, or -1 if 100 SDL_Init() has not been called with the SDL_INIT_CDROM flag. 101 */ 102 extern DECLSPEC int SDLCALL SDL_CDNumDrives(void); 103 104 /* Returns a human-readable, system-dependent identifier for the CD-ROM. 105 Example: 106 "/dev/cdrom" 107 "E:" 108 "/dev/disk/ide/1/master" 109 */ 110 extern DECLSPEC const char * SDLCALL SDL_CDName(int drive); 111 112 /* Opens a CD-ROM drive for access. It returns a drive handle on success, 113 or NULL if the drive was invalid or busy. This newly opened CD-ROM 114 becomes the default CD used when other CD functions are passed a NULL 115 CD-ROM handle. 116 Drives are numbered starting with 0. Drive 0 is the system default CD-ROM. 117 */ 118 extern DECLSPEC SDL_CD * SDLCALL SDL_CDOpen(int drive); 119 120 /* This function returns the current status of the given drive. 121 If the drive has a CD in it, the table of contents of the CD and current 122 play position of the CD will be stored in the SDL_CD structure. 123 */ 124 extern DECLSPEC CDstatus SDLCALL SDL_CDStatus(SDL_CD *cdrom); 125 126 /* Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks' 127 tracks and 'nframes' frames. If both 'ntrack' and 'nframe' are 0, play 128 until the end of the CD. This function will skip data tracks. 129 This function should only be called after calling SDL_CDStatus() to 130 get track information about the CD. 131 For example: 132 // Play entire CD: 133 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) 134 SDL_CDPlayTracks(cdrom, 0, 0, 0, 0); 135 // Play last track: 136 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) { 137 SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0); 138 } 139 // Play first and second track and 10 seconds of third track: 140 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) 141 SDL_CDPlayTracks(cdrom, 0, 0, 2, 10); 142 143 This function returns 0, or -1 if there was an error. 144 */ 145 extern DECLSPEC int SDLCALL SDL_CDPlayTracks(SDL_CD *cdrom, 146 int start_track, int start_frame, int ntracks, int nframes); 147 148 /* Play the given CD starting at 'start' frame for 'length' frames. 149 It returns 0, or -1 if there was an error. 150 */ 151 extern DECLSPEC int SDLCALL SDL_CDPlay(SDL_CD *cdrom, int start, int length); 152 153 /* Pause play -- returns 0, or -1 on error */ 154 extern DECLSPEC int SDLCALL SDL_CDPause(SDL_CD *cdrom); 155 156 /* Resume play -- returns 0, or -1 on error */ 157 extern DECLSPEC int SDLCALL SDL_CDResume(SDL_CD *cdrom); 158 159 /* Stop play -- returns 0, or -1 on error */ 160 extern DECLSPEC int SDLCALL SDL_CDStop(SDL_CD *cdrom); 161 162 /* Eject CD-ROM -- returns 0, or -1 on error */ 163 extern DECLSPEC int SDLCALL SDL_CDEject(SDL_CD *cdrom); 164 165 /* Closes the handle for the CD-ROM drive */ 166 extern DECLSPEC void SDLCALL SDL_CDClose(SDL_CD *cdrom); 167 168 169 /* Ends C function definitions when using C++ */ 170 #ifdef __cplusplus 171 } 172 #endif 173 #include "close_code.h" 174 175 #endif /* _SDL_video_h */ 176
