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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This is the CD-audio control API for Simple DirectMedia Layer */
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29
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30 #ifndef _SDL_cdrom_h
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31 #define _SDL_cdrom_h
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32
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33 #include "SDL_types.h"
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34
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35 #include "begin_code.h"
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36 /* Set up for C function definitions, even when using C++ */
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37 #ifdef __cplusplus
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38 extern "C" {
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39 #endif
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40
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41 /* In order to use these functions, SDL_Init() must have been called
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42 with the SDL_INIT_CDROM flag. This causes SDL to scan the system
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43 for CD-ROM drives, and load appropriate drivers.
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44 */
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45
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46 /* The maximum number of CD-ROM tracks on a disk */
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47 #define SDL_MAX_TRACKS 99
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48
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49 /* The types of CD-ROM track possible */
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50 #define SDL_AUDIO_TRACK 0x00
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51 #define SDL_DATA_TRACK 0x04
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52
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53 /* The possible states which a CD-ROM drive can be in. */
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54 typedef enum {
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55 CD_TRAYEMPTY,
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56 CD_STOPPED,
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57 CD_PLAYING,
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58 CD_PAUSED,
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59 CD_ERROR = -1
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60 } CDstatus;
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61
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62 /* Given a status, returns true if there's a disk in the drive */
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63 #define CD_INDRIVE(status) ((int)status > 0)
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64
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65 typedef struct {
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66 Uint8 id; /* Track number */
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67 Uint8 type; /* Data or audio track */
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68 Uint16 unused;
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69 Uint32 length; /* Length, in frames, of this track */
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70 Uint32 offset; /* Offset, in frames, from start of disk */
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71 } SDL_CDtrack;
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72
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73 /* This structure is only current as of the last call to SDL_CDStatus() */
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74 typedef struct SDL_CD {
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75 int id; /* Private drive identifier */
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76 CDstatus status; /* Current drive status */
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77
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78 /* The rest of this structure is only valid if there's a CD in drive */
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79 int numtracks; /* Number of tracks on disk */
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80 int cur_track; /* Current track position */
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81 int cur_frame; /* Current frame offset within current track */
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82 SDL_CDtrack track[SDL_MAX_TRACKS+1];
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83 } SDL_CD;
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84
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85 /* Conversion functions from frames to Minute/Second/Frames and vice versa */
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86 #define CD_FPS 75
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87 #define FRAMES_TO_MSF(f, M,S,F) { \
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88 int value = f; \
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89 *(F) = value%CD_FPS; \
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90 value /= CD_FPS; \
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91 *(S) = value%60; \
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92 value /= 60; \
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93 *(M) = value; \
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94 }
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95 #define MSF_TO_FRAMES(M, S, F) ((M)*60*CD_FPS+(S)*CD_FPS+(F))
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96
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97 /* CD-audio API functions: */
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98
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99 /* Returns the number of CD-ROM drives on the system, or -1 if
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100 SDL_Init() has not been called with the SDL_INIT_CDROM flag.
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101 */
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102 extern DECLSPEC int SDL_CDNumDrives(void);
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103
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104 /* Returns a human-readable, system-dependent identifier for the CD-ROM.
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105 Example:
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106 "/dev/cdrom"
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107 "E:"
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108 "/dev/disk/ide/1/master"
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109 */
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110 extern DECLSPEC const char * SDL_CDName(int drive);
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111
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112 /* Opens a CD-ROM drive for access. It returns a drive handle on success,
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113 or NULL if the drive was invalid or busy. This newly opened CD-ROM
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114 becomes the default CD used when other CD functions are passed a NULL
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115 CD-ROM handle.
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116 Drives are numbered starting with 0. Drive 0 is the system default CD-ROM.
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117 */
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118 extern DECLSPEC SDL_CD * SDL_CDOpen(int drive);
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119
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120 /* This function returns the current status of the given drive.
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121 If the drive has a CD in it, the table of contents of the CD and current
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122 play position of the CD will be stored in the SDL_CD structure.
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123 */
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124 extern DECLSPEC CDstatus SDL_CDStatus(SDL_CD *cdrom);
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125
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126 /* Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks'
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127 tracks and 'nframes' frames. If both 'ntrack' and 'nframe' are 0, play
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128 until the end of the CD. This function will skip data tracks.
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129 This function should only be called after calling SDL_CDStatus() to
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130 get track information about the CD.
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131 For example:
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132 // Play entire CD:
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133 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
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134 SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);
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135 // Play last track:
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136 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) {
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137 SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0);
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138 }
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139 // Play first and second track and 10 seconds of third track:
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140 if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
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141 SDL_CDPlayTracks(cdrom, 0, 0, 2, 10);
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142
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143 This function returns 0, or -1 if there was an error.
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144 */
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145 extern DECLSPEC int SDL_CDPlayTracks(SDL_CD *cdrom,
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146 int start_track, int start_frame, int ntracks, int nframes);
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147
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148 /* Play the given CD starting at 'start' frame for 'length' frames.
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149 It returns 0, or -1 if there was an error.
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150 */
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151 extern DECLSPEC int SDL_CDPlay(SDL_CD *cdrom, int start, int length);
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152
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153 /* Pause play -- returns 0, or -1 on error */
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154 extern DECLSPEC int SDL_CDPause(SDL_CD *cdrom);
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155
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156 /* Resume play -- returns 0, or -1 on error */
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157 extern DECLSPEC int SDL_CDResume(SDL_CD *cdrom);
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158
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159 /* Stop play -- returns 0, or -1 on error */
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160 extern DECLSPEC int SDL_CDStop(SDL_CD *cdrom);
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161
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162 /* Eject CD-ROM -- returns 0, or -1 on error */
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163 extern DECLSPEC int SDL_CDEject(SDL_CD *cdrom);
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164
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165 /* Closes the handle for the CD-ROM drive */
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166 extern DECLSPEC void SDL_CDClose(SDL_CD *cdrom);
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167
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168
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169 /* Ends C function definitions when using C++ */
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170 #ifdef __cplusplus
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171 }
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172 #endif
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173 #include "close_code.h"
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174
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175 #endif /* _SDL_video_h */
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