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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2009 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 Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 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 Lesser 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 Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 |
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23 /** |
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24 * @file SDL_cdrom.h |
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25 * This is the CD-audio control API for Simple DirectMedia Layer |
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26 */ |
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27 |
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28 #ifndef _SDL_cdrom_h |
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29 #define _SDL_cdrom_h |
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30 |
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31 #include "SDL_stdinc.h" |
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32 #include "SDL_error.h" |
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33 |
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34 #include "begin_code.h" |
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35 /* Set up for C function definitions, even when using C++ */ |
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36 #ifdef __cplusplus |
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37 extern "C" { |
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38 #endif |
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39 |
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40 /** |
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41 * @file SDL_cdrom.h |
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42 * In order to use these functions, SDL_Init() must have been called |
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43 * with the SDL_INIT_CDROM flag. This causes SDL to scan the system |
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44 * for CD-ROM drives, and load appropriate drivers. |
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45 */ |
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46 |
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47 /** The maximum number of CD-ROM tracks on a disk */ |
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48 #define SDL_MAX_TRACKS 99 |
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49 |
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50 /** @name Track Types |
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51 * The types of CD-ROM track possible |
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52 */ |
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53 /*@{*/ |
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54 #define SDL_AUDIO_TRACK 0x00 |
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55 #define SDL_DATA_TRACK 0x04 |
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56 /*@}*/ |
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57 |
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58 /** The possible states which a CD-ROM drive can be in. */ |
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59 typedef enum { |
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60 CD_TRAYEMPTY, |
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61 CD_STOPPED, |
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62 CD_PLAYING, |
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63 CD_PAUSED, |
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64 CD_ERROR = -1 |
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65 } CDstatus; |
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66 |
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67 /** Given a status, returns true if there's a disk in the drive */ |
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68 #define CD_INDRIVE(status) ((int)(status) > 0) |
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69 |
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70 typedef struct SDL_CDtrack { |
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71 Uint8 id; /**< Track number */ |
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72 Uint8 type; /**< Data or audio track */ |
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73 Uint16 unused; |
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74 Uint32 length; /**< Length, in frames, of this track */ |
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75 Uint32 offset; /**< Offset, in frames, from start of disk */ |
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76 } SDL_CDtrack; |
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77 |
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78 /** This structure is only current as of the last call to SDL_CDStatus() */ |
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79 typedef struct SDL_CD { |
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80 int id; /**< Private drive identifier */ |
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81 CDstatus status; /**< Current drive status */ |
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82 |
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83 /** The rest of this structure is only valid if there's a CD in drive */ |
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84 /*@{*/ |
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85 int numtracks; /**< Number of tracks on disk */ |
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86 int cur_track; /**< Current track position */ |
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87 int cur_frame; /**< Current frame offset within current track */ |
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88 SDL_CDtrack track[SDL_MAX_TRACKS+1]; |
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89 /*@}*/ |
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90 } SDL_CD; |
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91 |
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92 /** @name Frames / MSF Conversion Functions |
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93 * Conversion functions from frames to Minute/Second/Frames and vice versa |
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94 */ |
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95 /*@{*/ |
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96 #define CD_FPS 75 |
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97 #define FRAMES_TO_MSF(f, M,S,F) { \ |
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98 int value = f; \ |
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99 *(F) = value%CD_FPS; \ |
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100 value /= CD_FPS; \ |
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101 *(S) = value%60; \ |
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102 value /= 60; \ |
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103 *(M) = value; \ |
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104 } |
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105 #define MSF_TO_FRAMES(M, S, F) ((M)*60*CD_FPS+(S)*CD_FPS+(F)) |
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106 /*@}*/ |
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107 |
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108 /* CD-audio API functions: */ |
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109 |
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110 /** |
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111 * Returns the number of CD-ROM drives on the system, or -1 if |
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112 * SDL_Init() has not been called with the SDL_INIT_CDROM flag. |
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113 */ |
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114 extern DECLSPEC int SDLCALL SDL_CDNumDrives(void); |
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115 |
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116 /** |
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117 * Returns a human-readable, system-dependent identifier for the CD-ROM. |
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118 * Example: |
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119 * - "/dev/cdrom" |
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120 * - "E:" |
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121 * - "/dev/disk/ide/1/master" |
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122 */ |
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123 extern DECLSPEC const char * SDLCALL SDL_CDName(int drive); |
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124 |
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125 /** |
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126 * Opens a CD-ROM drive for access. It returns a drive handle on success, |
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127 * or NULL if the drive was invalid or busy. This newly opened CD-ROM |
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128 * becomes the default CD used when other CD functions are passed a NULL |
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129 * CD-ROM handle. |
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130 * Drives are numbered starting with 0. Drive 0 is the system default CD-ROM. |
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131 */ |
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132 extern DECLSPEC SDL_CD * SDLCALL SDL_CDOpen(int drive); |
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133 |
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134 /** |
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135 * This function returns the current status of the given drive. |
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136 * If the drive has a CD in it, the table of contents of the CD and current |
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137 * play position of the CD will be stored in the SDL_CD structure. |
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138 */ |
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139 extern DECLSPEC CDstatus SDLCALL SDL_CDStatus(SDL_CD *cdrom); |
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140 |
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141 /** |
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142 * Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks' |
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143 * tracks and 'nframes' frames. If both 'ntrack' and 'nframe' are 0, play |
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144 * until the end of the CD. This function will skip data tracks. |
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145 * This function should only be called after calling SDL_CDStatus() to |
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146 * get track information about the CD. |
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147 * For example: |
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148 * @code |
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149 * // Play entire CD: |
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150 * if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) |
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151 * SDL_CDPlayTracks(cdrom, 0, 0, 0, 0); |
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152 * // Play last track: |
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153 * if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) { |
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154 * SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0); |
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155 * } |
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156 * // Play first and second track and 10 seconds of third track: |
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157 * if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) |
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158 * SDL_CDPlayTracks(cdrom, 0, 0, 2, 10); |
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159 * @endcode |
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160 * |
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161 * @return This function returns 0, or -1 if there was an error. |
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162 */ |
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163 extern DECLSPEC int SDLCALL SDL_CDPlayTracks(SDL_CD *cdrom, |
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164 int start_track, int start_frame, int ntracks, int nframes); |
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165 |
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166 /** |
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167 * Play the given CD starting at 'start' frame for 'length' frames. |
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168 * @return It returns 0, or -1 if there was an error. |
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169 */ |
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170 extern DECLSPEC int SDLCALL SDL_CDPlay(SDL_CD *cdrom, int start, int length); |
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171 |
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172 /** Pause play |
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173 * @return returns 0, or -1 on error |
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174 */ |
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175 extern DECLSPEC int SDLCALL SDL_CDPause(SDL_CD *cdrom); |
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176 |
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177 /** Resume play |
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178 * @return returns 0, or -1 on error |
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179 */ |
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180 extern DECLSPEC int SDLCALL SDL_CDResume(SDL_CD *cdrom); |
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181 |
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182 /** Stop play |
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183 * @return returns 0, or -1 on error |
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184 */ |
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185 extern DECLSPEC int SDLCALL SDL_CDStop(SDL_CD *cdrom); |
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186 |
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187 /** Eject CD-ROM |
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188 * @return returns 0, or -1 on error |
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189 */ |
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190 extern DECLSPEC int SDLCALL SDL_CDEject(SDL_CD *cdrom); |
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191 |
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192 /** Closes the handle for the CD-ROM drive */ |
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193 extern DECLSPEC void SDLCALL SDL_CDClose(SDL_CD *cdrom); |
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194 |
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195 |
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196 /* Ends C function definitions when using C++ */ |
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197 #ifdef __cplusplus |
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198 } |
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199 #endif |
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200 #include "close_code.h" |
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201 |
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202 #endif /* _SDL_video_h */ |