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annotate src/cdrom/SDL_cdrom.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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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: */