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annotate src/cdrom/SDL_cdrom.c @ 2207:d63e9f5944ae

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Jul 2007 17:09:01 +0000
parents 542c78b6fb12
children e1da92da346c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #include "SDL_config.h"
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23
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24 /* This is the CD-audio control API for Simple DirectMedia Layer */
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25
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26 #include "SDL_cdrom.h"
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27 #include "SDL_syscdrom.h"
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28
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29 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */
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30
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31 static int SDL_cdinitted = 0;
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32 static SDL_CD *default_cdrom;
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33
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34 /* The system level CD-ROM control functions */
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35 struct CDcaps SDL_CDcaps = {
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36 NULL, /* Name */
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37 NULL, /* Open */
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38 NULL, /* GetTOC */
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39 NULL, /* Status */
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40 NULL, /* Play */
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41 NULL, /* Pause */
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42 NULL, /* Resume */
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43 NULL, /* Stop */
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44 NULL, /* Eject */
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45 NULL, /* Close */
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46 };
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47 int SDL_numcds;
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48
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49 int
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50 SDL_CDROMInit(void)
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51 {
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52 int retval;
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53
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54 SDL_numcds = 0;
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55 retval = SDL_SYS_CDInit();
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56 if (retval == 0) {
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57 SDL_cdinitted = 1;
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58 }
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59 default_cdrom = NULL;
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60 return (retval);
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61 }
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62
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63 /* Check to see if the CD-ROM subsystem has been initialized */
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64 static int
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65 CheckInit(int check_cdrom, SDL_CD ** cdrom)
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66 {
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67 int okay;
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68
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69 okay = SDL_cdinitted;
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70 if (check_cdrom && (*cdrom == NULL)) {
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71 *cdrom = default_cdrom;
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72 if (*cdrom == NULL) {
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73 SDL_SetError("CD-ROM not opened");
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74 okay = 0;
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75 }
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76 }
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77 if (!SDL_cdinitted) {
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78 SDL_SetError("CD-ROM subsystem not initialized");
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79 }
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80 return (okay);
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81 }
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82
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83 int
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84 SDL_CDNumDrives(void)
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85 {
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86 if (!CheckInit(0, NULL)) {
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87 return (-1);
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88 }
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89 return (SDL_numcds);
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90 }
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91
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92 const char *
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93 SDL_CDName(int drive)
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94 {
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95 if (!CheckInit(0, NULL)) {
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96 return (NULL);
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97 }
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98 if (drive >= SDL_numcds) {
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99 SDL_SetError("Invalid CD-ROM drive index");
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100 return (NULL);
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101 }
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102 if (SDL_CDcaps.Name) {
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103 return (SDL_CDcaps.Name(drive));
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104 } else {
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105 return ("");
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106 }
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107 }
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108
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109 SDL_CD *
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110 SDL_CDOpen(int drive)
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111 {
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112 struct SDL_CD *cdrom;
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113
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114 if (!CheckInit(0, NULL)) {
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115 return (NULL);
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116 }
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117 if (drive >= SDL_numcds) {
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118 SDL_SetError("Invalid CD-ROM drive index");
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119 return (NULL);
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120 }
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121 cdrom = (SDL_CD *) SDL_malloc(sizeof(*cdrom));
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122 if (cdrom == NULL) {
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123 SDL_OutOfMemory();
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124 return (NULL);
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125 }
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126 SDL_memset(cdrom, 0, sizeof(*cdrom));
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127 cdrom->id = SDL_CDcaps.Open(drive);
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128 if (cdrom->id < 0) {
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129 SDL_free(cdrom);
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130 return (NULL);
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131 }
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132 default_cdrom = cdrom;
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133 return (cdrom);
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134 }
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135
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136 CDstatus
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137 SDL_CDStatus(SDL_CD * cdrom)
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138 {
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139 CDstatus status;
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140 int i;
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141 Uint32 position;
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142
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143 /* Check if the CD-ROM subsystem has been initialized */
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144 if (!CheckInit(1, &cdrom)) {
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145 return (CD_ERROR);
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146 }
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147
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148 /* Get the current status of the drive */
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149 cdrom->numtracks = 0;
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150 cdrom->cur_track = 0;
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151 cdrom->cur_frame = 0;
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152 status = SDL_CDcaps.Status(cdrom, &i);
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153 position = (Uint32) i;
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154 cdrom->status = status;
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155
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156 /* Get the table of contents, if there's a CD available */
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157 if (CD_INDRIVE(status)) {
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158 if (SDL_CDcaps.GetTOC(cdrom) < 0) {
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159 status = CD_ERROR;
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160 }
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161 /* If the drive is playing, get current play position */
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162 if ((status == CD_PLAYING) || (status == CD_PAUSED)) {
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163 for (i = 1; cdrom->track[i].offset <= position; ++i) {
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164 /* Keep looking */ ;
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165 }
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166 #ifdef DEBUG_CDROM
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167 fprintf(stderr,
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168 "Current position: %d, track = %d (offset is %d)\n",
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169 position, i - 1, cdrom->track[i - 1].offset);
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170 #endif
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171 cdrom->cur_track = i - 1;
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172 position -= cdrom->track[cdrom->cur_track].offset;
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173 cdrom->cur_frame = position;
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174 }
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175 }
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176 return (status);
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177 }
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178
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179 int
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180 SDL_CDPlayTracks(SDL_CD * cdrom,
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181 int strack, int sframe, int ntracks, int nframes)
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182 {
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183 int etrack, eframe;
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184 int start, length;
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185
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186 /* Check if the CD-ROM subsystem has been initialized */
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187 if (!CheckInit(1, &cdrom)) {
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188 return (CD_ERROR);
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189 }
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190
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191 /* Determine the starting and ending tracks */
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192 if ((strack < 0) || (strack >= cdrom->numtracks)) {
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193 SDL_SetError("Invalid starting track");
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194 return (CD_ERROR);
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195 }
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196 if (!ntracks && !nframes) {
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197 etrack = cdrom->numtracks;
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198 eframe = 0;
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199 } else {
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200 etrack = strack + ntracks;
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201 if (etrack == strack) {
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202 eframe = sframe + nframes;
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203 } else {
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204 eframe = nframes;
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205 }
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206 }
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207 if (etrack > cdrom->numtracks) {
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208 SDL_SetError("Invalid play length");
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209 return (CD_ERROR);
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210 }
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211
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212 /* Skip data tracks and verify frame offsets */
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213 while ((strack <= etrack) &&
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214 (cdrom->track[strack].type == SDL_DATA_TRACK)) {
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215 ++strack;
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216 }
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217 if (sframe >= (int) cdrom->track[strack].length) {
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218 SDL_SetError("Invalid starting frame for track %d", strack);
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219 return (CD_ERROR);
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220 }
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221 while ((etrack > strack) &&
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222 (cdrom->track[etrack - 1].type == SDL_DATA_TRACK)) {
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223 --etrack;
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224 }
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225 if (eframe > (int) cdrom->track[etrack].length) {
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226 SDL_SetError("Invalid ending frame for track %d", etrack);
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227 return (CD_ERROR);
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228 }
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229
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230 /* Determine start frame and play length */
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231 start = (cdrom->track[strack].offset + sframe);
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232 length = (cdrom->track[etrack].offset + eframe) - start;
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233 #ifdef CLIP_FRAMES
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234 /* I've never seen this necessary, but xmcd does it.. */
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235 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */
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236 #endif
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237 if (length < 0) {
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238 return (0);
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239 }
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240
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241 /* Play! */
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242 #ifdef DEBUG_CDROM
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243 fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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244 #endif
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245 return (SDL_CDcaps.Play(cdrom, start, length));
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246 }
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247
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248 int
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249 SDL_CDPlay(SDL_CD * cdrom, int sframe, int length)
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250 {
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251 /* Check if the CD-ROM subsystem has been initialized */
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252 if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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253 return (CD_ERROR);
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254 }
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255
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256 return (SDL_CDcaps.Play(cdrom, sframe, length));
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257 }
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258
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259 int
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260 SDL_CDPause(SDL_CD * cdrom)
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261 {
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262 CDstatus status;
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263 int retval;
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264
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265 /* Check if the CD-ROM subsystem has been initialized */
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266 if (!CheckInit(1, &cdrom)) {
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267 return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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268 }
0
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269
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270 status = SDL_CDcaps.Status(cdrom, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 switch (status) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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272 case CD_PLAYING:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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273 retval = SDL_CDcaps.Pause(cdrom);
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274 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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275 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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276 retval = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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277 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
278 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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279 return (retval);
0
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parents:
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280 }
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281
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282 int
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283 SDL_CDResume(SDL_CD * cdrom)
0
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284 {
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285 CDstatus status;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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286 int retval;
0
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287
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288 /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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289 if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
291 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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292
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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293 status = SDL_CDcaps.Status(cdrom, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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294 switch (status) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
295 case CD_PAUSED:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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296 retval = SDL_CDcaps.Resume(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
297 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
298 retval = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
299 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
300 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
301 return (retval);
0
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parents:
diff changeset
302 }
74212992fb08 Initial revision
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diff changeset
303
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
304 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
305 SDL_CDStop(SDL_CD * cdrom)
0
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parents:
diff changeset
306 {
1895
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diff changeset
307 CDstatus status;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
308 int retval;
0
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diff changeset
309
1895
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diff changeset
310 /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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311 if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
312 return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
313 }
0
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parents:
diff changeset
314
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
315 status = SDL_CDcaps.Status(cdrom, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
316 switch (status) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
317 case CD_PLAYING:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
318 case CD_PAUSED:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
319 retval = SDL_CDcaps.Stop(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
320 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
321 retval = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
322 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
323 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
324 return (retval);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 }
74212992fb08 Initial revision
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parents:
diff changeset
326
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
327 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
328 SDL_CDEject(SDL_CD * cdrom)
0
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parents:
diff changeset
329 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
330 /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
331 if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
332 return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
333 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
334 return (SDL_CDcaps.Eject(cdrom));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
337 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
338 SDL_CDClose(SDL_CD * cdrom)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
340 /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
341 if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
342 return;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
343 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
344 SDL_CDcaps.Close(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
345 SDL_free(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
346 default_cdrom = NULL;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
347 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
348
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
349 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
350 SDL_CDROMQuit(void)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
351 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
352 SDL_SYS_CDQuit();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
353 SDL_cdinitted = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
354 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
355
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
356 /* vi: set ts=4 sw=4 expandtab: */