Mercurial > sdl-ios-xcode

annotate src/cdrom/SDL_cdrom.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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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 #if !defined(__MACOS__)
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30 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */
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31 #endif
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32
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33 static int SDL_cdinitted = 0;
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34 static SDL_CD *default_cdrom;
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35
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36 /* The system level CD-ROM control functions */
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37 struct CDcaps SDL_CDcaps = {
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38 NULL, /* Name */
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39 NULL, /* Open */
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40 NULL, /* GetTOC */
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41 NULL, /* Status */
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42 NULL, /* Play */
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43 NULL, /* Pause */
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44 NULL, /* Resume */
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45 NULL, /* Stop */
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46 NULL, /* Eject */
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47 NULL, /* Close */
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48 };
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49 int SDL_numcds;
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50
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51 int
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52 SDL_CDROMInit(void)
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53 {
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54 int retval;
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55
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56 SDL_numcds = 0;
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57 retval = SDL_SYS_CDInit();
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58 if (retval == 0) {
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59 SDL_cdinitted = 1;
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60 }
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61 default_cdrom = NULL;
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62 return (retval);
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63 }
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64
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65 /* Check to see if the CD-ROM subsystem has been initialized */
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66 static int
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67 CheckInit(int check_cdrom, SDL_CD ** cdrom)
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68 {
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69 int okay;
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70
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71 okay = SDL_cdinitted;
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72 if (check_cdrom && (*cdrom == NULL)) {
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73 *cdrom = default_cdrom;
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74 if (*cdrom == NULL) {
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75 SDL_SetError("CD-ROM not opened");
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76 okay = 0;
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77 }
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78 }
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79 if (!SDL_cdinitted) {
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80 SDL_SetError("CD-ROM subsystem not initialized");
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81 }
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82 return (okay);
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83 }
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84
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85 int
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86 SDL_CDNumDrives(void)
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87 {
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88 if (!CheckInit(0, NULL)) {
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89 return (-1);
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90 }
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91 return (SDL_numcds);
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92 }
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93
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94 const char *
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95 SDL_CDName(int drive)
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96 {
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97 if (!CheckInit(0, NULL)) {
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98 return (NULL);
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99 }
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100 if (drive >= SDL_numcds) {
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101 SDL_SetError("Invalid CD-ROM drive index");
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102 return (NULL);
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103 }
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104 if (SDL_CDcaps.Name) {
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105 return (SDL_CDcaps.Name(drive));
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106 } else {
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107 return ("");
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108 }
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109 }
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110
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111 SDL_CD *
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112 SDL_CDOpen(int drive)
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113 {
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114 struct SDL_CD *cdrom;
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115
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116 if (!CheckInit(0, NULL)) {
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117 return (NULL);
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118 }
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119 if (drive >= SDL_numcds) {
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120 SDL_SetError("Invalid CD-ROM drive index");
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121 return (NULL);
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122 }
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123 cdrom = (SDL_CD *) SDL_malloc(sizeof(*cdrom));
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124 if (cdrom == NULL) {
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125 SDL_OutOfMemory();
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126 return (NULL);
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127 }
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128 SDL_memset(cdrom, 0, sizeof(*cdrom));
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129 cdrom->id = SDL_CDcaps.Open(drive);
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130 if (cdrom->id < 0) {
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131 SDL_free(cdrom);
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132 return (NULL);
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133 }
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134 default_cdrom = cdrom;
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135 return (cdrom);
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136 }
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137
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138 CDstatus
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139 SDL_CDStatus(SDL_CD * cdrom)
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140 {
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141 CDstatus status;
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142 int i;
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143 Uint32 position;
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144
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145 /* Check if the CD-ROM subsystem has been initialized */
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146 if (!CheckInit(1, &cdrom)) {
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147 return (CD_ERROR);
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148 }
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149
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150 /* Get the current status of the drive */
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151 cdrom->numtracks = 0;
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152 cdrom->cur_track = 0;
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153 cdrom->cur_frame = 0;
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154 status = SDL_CDcaps.Status(cdrom, &i);
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155 position = (Uint32) i;
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156 cdrom->status = status;
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157
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158 /* Get the table of contents, if there's a CD available */
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159 if (CD_INDRIVE(status)) {
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160 if (SDL_CDcaps.GetTOC(cdrom) < 0) {
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161 status = CD_ERROR;
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162 }
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163 /* If the drive is playing, get current play position */
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164 if ((status == CD_PLAYING) || (status == CD_PAUSED)) {
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165 for (i = 1; cdrom->track[i].offset <= position; ++i) {
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166 /* Keep looking */ ;
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167 }
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168 #ifdef DEBUG_CDROM
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169 fprintf(stderr,
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170 "Current position: %d, track = %d (offset is %d)\n",
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171 position, i - 1, cdrom->track[i - 1].offset);
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172 #endif
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173 cdrom->cur_track = i - 1;
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174 position -= cdrom->track[cdrom->cur_track].offset;
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175 cdrom->cur_frame = position;
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176 }
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177 }
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178 return (status);
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179 }
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180
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181 int
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182 SDL_CDPlayTracks(SDL_CD * cdrom,
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183 int strack, int sframe, int ntracks, int nframes)
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184 {
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185 int etrack, eframe;
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186 int start, length;
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187
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188 /* Check if the CD-ROM subsystem has been initialized */
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189 if (!CheckInit(1, &cdrom)) {
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190 return (CD_ERROR);
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191 }
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192
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193 /* Determine the starting and ending tracks */
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194 if ((strack < 0) || (strack >= cdrom->numtracks)) {
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195 SDL_SetError("Invalid starting track");
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196 return (CD_ERROR);
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197 }
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198 if (!ntracks && !nframes) {
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199 etrack = cdrom->numtracks;
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200 eframe = 0;
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201 } else {
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202 etrack = strack + ntracks;
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203 if (etrack == strack) {
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204 eframe = sframe + nframes;
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205 } else {
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206 eframe = nframes;
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207 }
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208 }
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209 if (etrack > cdrom->numtracks) {
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210 SDL_SetError("Invalid play length");
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211 return (CD_ERROR);
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212 }
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213
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214 /* Skip data tracks and verify frame offsets */
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215 while ((strack <= etrack) &&
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216 (cdrom->track[strack].type == SDL_DATA_TRACK)) {
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217 ++strack;
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218 }
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219 if (sframe >= (int) cdrom->track[strack].length) {
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220 SDL_SetError("Invalid starting frame for track %d", strack);
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221 return (CD_ERROR);
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222 }
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223 while ((etrack > strack) &&
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224 (cdrom->track[etrack - 1].type == SDL_DATA_TRACK)) {
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225 --etrack;
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226 }
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227 if (eframe > (int) cdrom->track[etrack].length) {
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228 SDL_SetError("Invalid ending frame for track %d", etrack);
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229 return (CD_ERROR);
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230 }
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231
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232 /* Determine start frame and play length */
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233 start = (cdrom->track[strack].offset + sframe);
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234 length = (cdrom->track[etrack].offset + eframe) - start;
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235 #ifdef CLIP_FRAMES
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236 /* I've never seen this necessary, but xmcd does it.. */
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237 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */
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238 #endif
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239 if (length < 0) {
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240 return (0);
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241 }
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242
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243 /* Play! */
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244 #ifdef DEBUG_CDROM
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245 fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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246 #endif
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247 return (SDL_CDcaps.Play(cdrom, start, length));
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248 }
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249
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250 int
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251 SDL_CDPlay(SDL_CD * cdrom, int sframe, int length)
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252 {
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253 /* Check if the CD-ROM subsystem has been initialized */
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254 if (!CheckInit(1, &cdrom)) {
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255 return (CD_ERROR);
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256 }
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257
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258 return (SDL_CDcaps.Play(cdrom, sframe, length));
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259 }
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260
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261 int
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262 SDL_CDPause(SDL_CD * cdrom)
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263 {
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264 CDstatus status;
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265 int retval;
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266
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267 /* Check if the CD-ROM subsystem has been initialized */
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268 if (!CheckInit(1, &cdrom)) {
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269 return (CD_ERROR);
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270 }
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271
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272 status = SDL_CDcaps.Status(cdrom, NULL);
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273 switch (status) {
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274 case CD_PLAYING:
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275 retval = SDL_CDcaps.Pause(cdrom);
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276 break;
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277 default:
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278 retval = 0;
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279 break;
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280 }
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281 return (retval);
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282 }
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283
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284 int
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285 SDL_CDResume(SDL_CD * cdrom)
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286 {
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287 CDstatus status;
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288 int retval;
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289
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290 /* Check if the CD-ROM subsystem has been initialized */
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291 if (!CheckInit(1, &cdrom)) {
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292 return (CD_ERROR);
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293 }
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294
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295 status = SDL_CDcaps.Status(cdrom, NULL);
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296 switch (status) {
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297 case CD_PAUSED:
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298 retval = SDL_CDcaps.Resume(cdrom);
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299 default:
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300 retval = 0;
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301 break;
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302 }
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303 return (retval);
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304 }
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305
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306 int
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307 SDL_CDStop(SDL_CD * cdrom)
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308 {
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309 CDstatus status;
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310 int retval;
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311
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312 /* Check if the CD-ROM subsystem has been initialized */
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313 if (!CheckInit(1, &cdrom)) {
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314 return (CD_ERROR);
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315 }
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316
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317 status = SDL_CDcaps.Status(cdrom, NULL);
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318 switch (status) {
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319 case CD_PLAYING:
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320 case CD_PAUSED:
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321 retval = SDL_CDcaps.Stop(cdrom);
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322 default:
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323 retval = 0;
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324 break;
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325 }
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326 return (retval);
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327 }
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328
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329 int
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330 SDL_CDEject(SDL_CD * cdrom)
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331 {
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332 /* Check if the CD-ROM subsystem has been initialized */
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333 if (!CheckInit(1, &cdrom)) {
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334 return (CD_ERROR);
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335 }
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336 return (SDL_CDcaps.Eject(cdrom));
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337 }
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338
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339 void
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340 SDL_CDClose(SDL_CD * cdrom)
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341 {
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342 /* Check if the CD-ROM subsystem has been initialized */
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343 if (!CheckInit(1, &cdrom)) {
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344 return;
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345 }
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346 SDL_CDcaps.Close(cdrom);
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347 SDL_free(cdrom);
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348 default_cdrom = NULL;
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349 }
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350
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351 void
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352 SDL_CDROMQuit(void)
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353 {
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354 SDL_SYS_CDQuit();
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355 SDL_cdinitted = 0;
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356 }
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357
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358 /* vi: set ts=4 sw=4 expandtab: */