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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This is the CD-audio control API for Simple DirectMedia Layer */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_cdrom.h"
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36 #include "SDL_syscdrom.h"
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37
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38 #if !defined(macintosh)
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39 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */
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40 #endif
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41
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42 static int SDL_cdinitted = 0;
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43 static SDL_CD *default_cdrom;
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44
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45 /* The system level CD-ROM control functions */
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46 struct CDcaps SDL_CDcaps = {
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47 NULL, /* Name */
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48 NULL, /* Open */
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49 NULL, /* GetTOC */
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50 NULL, /* Status */
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51 NULL, /* Play */
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52 NULL, /* Pause */
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53 NULL, /* Resume */
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54 NULL, /* Stop */
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55 NULL, /* Eject */
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56 NULL, /* Close */
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57 };
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58 int SDL_numcds;
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59
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60 int SDL_CDROMInit(void)
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61 {
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62 int retval;
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63
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64 SDL_numcds = 0;
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65 retval = SDL_SYS_CDInit();
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66 if ( retval == 0 ) {
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67 SDL_cdinitted = 1;
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68 }
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69 default_cdrom = NULL;
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70 return(retval);
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71 }
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72
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73 /* Check to see if the CD-ROM subsystem has been initialized */
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74 static int CheckInit(int check_cdrom, SDL_CD **cdrom)
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75 {
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76 int okay;
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77
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78 okay = SDL_cdinitted;
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79 if ( check_cdrom && (*cdrom == NULL) ) {
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80 *cdrom = default_cdrom;
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81 if ( *cdrom == NULL ) {
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82 SDL_SetError("CD-ROM not opened");
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83 okay = 0;
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84 }
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85 }
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86 if ( ! SDL_cdinitted ) {
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87 SDL_SetError("CD-ROM subsystem not initialized");
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88 }
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89 return(okay);
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90 }
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91
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92 int SDL_CDNumDrives(void)
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93 {
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94 if ( ! CheckInit(0, NULL) ) {
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95 return(-1);
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96 }
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97 return(SDL_numcds);
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98 }
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99
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100 const char *SDL_CDName(int drive)
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101 {
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102 if ( ! CheckInit(0, NULL) ) {
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103 return(NULL);
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104 }
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105 if ( drive >= SDL_numcds ) {
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106 SDL_SetError("Invalid CD-ROM drive index");
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107 return(NULL);
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108 }
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109 if ( SDL_CDcaps.Name ) {
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110 return(SDL_CDcaps.Name(drive));
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111 } else {
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112 return("");
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113 }
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114 }
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115
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116 SDL_CD *SDL_CDOpen(int drive)
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117 {
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118 struct SDL_CD *cdrom;
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119
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120 if ( ! CheckInit(0, NULL) ) {
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121 return(NULL);
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122 }
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123 if ( drive >= SDL_numcds ) {
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124 SDL_SetError("Invalid CD-ROM drive index");
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125 return(NULL);
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126 }
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127 cdrom = (SDL_CD *)malloc(sizeof(*cdrom));
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128 if ( cdrom == NULL ) {
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129 SDL_OutOfMemory();
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130 return(NULL);
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131 }
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132 memset(cdrom, 0, sizeof(*cdrom));
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133 cdrom->id = SDL_CDcaps.Open(drive);
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134 if ( cdrom->id < 0 ) {
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135 free(cdrom);
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136 return(NULL);
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137 }
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138 default_cdrom = cdrom;
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139 return(cdrom);
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140 }
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141
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142 CDstatus SDL_CDStatus(SDL_CD *cdrom)
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143 {
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144 CDstatus status;
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145 int i;
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146 Uint32 position;
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147
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148 /* Check if the CD-ROM subsystem has been initialized */
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149 if ( ! CheckInit(1, &cdrom) ) {
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150 return(CD_ERROR);
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151 }
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152
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153 /* Get the current status of the drive */
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154 cdrom->numtracks = 0;
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155 cdrom->cur_track = 0;
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156 cdrom->cur_frame = 0;
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157 status = SDL_CDcaps.Status(cdrom, &i);
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158 position = (Uint32)i;
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159 cdrom->status = status;
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160
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161 /* Get the table of contents, if there's a CD available */
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162 if ( CD_INDRIVE(status) ) {
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163 if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) {
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164 status = CD_ERROR;
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165 }
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166 /* If the drive is playing, get current play position */
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167 if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) {
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168 for ( i=1; cdrom->track[i].offset <= position; ++i ) {
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169 /* Keep looking */;
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170 }
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171 #ifdef DEBUG_CDROM
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172 fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n",
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173 position, i-1, cdrom->track[i-1].offset);
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174 #endif
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175 cdrom->cur_track = i-1;
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176 position -= cdrom->track[cdrom->cur_track].offset;
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177 cdrom->cur_frame = position;
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178 }
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179 }
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180 return(status);
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181 }
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182
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183 int SDL_CDPlayTracks(SDL_CD *cdrom,
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184 int strack, int sframe, int ntracks, int nframes)
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185 {
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186 int etrack, eframe;
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187 int start, length;
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188
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189 /* Check if the CD-ROM subsystem has been initialized */
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190 if ( ! CheckInit(1, &cdrom) ) {
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191 return(CD_ERROR);
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192 }
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193
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194 /* Determine the starting and ending tracks */
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195 if ( (strack < 0) || (strack >= cdrom->numtracks) ) {
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196 SDL_SetError("Invalid starting track");
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197 return(CD_ERROR);
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198 }
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199 if ( ! ntracks && ! nframes ) {
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200 etrack = cdrom->numtracks;
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201 eframe = 0;
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202 } else {
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203 etrack = strack+ntracks;
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204 if ( etrack == strack ) {
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205 eframe = sframe + nframes;
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206 } else {
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207 eframe = nframes;
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208 }
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209 }
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210 if ( etrack > cdrom->numtracks ) {
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211 SDL_SetError("Invalid play length");
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212 return(CD_ERROR);
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213 }
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214
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215 /* Skip data tracks and verify frame offsets */
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216 while ( (strack <= etrack) &&
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217 (cdrom->track[strack].type == SDL_DATA_TRACK) ) {
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218 ++strack;
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219 }
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220 if ( sframe >= (int)cdrom->track[strack].length ) {
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221 SDL_SetError("Invalid starting frame for track %d", strack);
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222 return(CD_ERROR);
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223 }
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224 while ( (etrack > strack) &&
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225 (cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) {
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226 --etrack;
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227 }
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228 if ( eframe > (int)cdrom->track[etrack].length ) {
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229 SDL_SetError("Invalid ending frame for track %d", etrack);
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230 return(CD_ERROR);
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231 }
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232
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233 /* Determine start frame and play length */
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234 start = (cdrom->track[strack].offset+sframe);
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235 length = (cdrom->track[etrack].offset+eframe)-start;
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236 #ifdef CLIP_FRAMES
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237 /* I've never seen this necessary, but xmcd does it.. */
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238 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */
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239 #endif
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240 if ( length < 0 ) {
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241 return(0);
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242 }
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243
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244 /* Play! */
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245 #ifdef DEBUG_CDROM
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246 fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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247 #endif
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248 return(SDL_CDcaps.Play(cdrom, start, length));
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249 }
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250
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251 int 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 SDL_CDPause(SDL_CD *cdrom)
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262 {
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263 CDstatus status;
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264 int retval;
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265
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266 /* Check if the CD-ROM subsystem has been initialized */
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267 if ( ! CheckInit(1, &cdrom) ) {
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268 return(CD_ERROR);
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269 }
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270
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271 status = SDL_CDcaps.Status(cdrom, NULL);
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272 switch (status) {
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273 case CD_PLAYING:
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274 retval = SDL_CDcaps.Pause(cdrom);
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275 break;
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276 default:
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277 retval = 0;
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278 break;
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279 }
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280 return(retval);
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281 }
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282
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283 int SDL_CDResume(SDL_CD *cdrom)
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284 {
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285 CDstatus status;
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286 int retval;
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287
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288 /* Check if the CD-ROM subsystem has been initialized */
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289 if ( ! CheckInit(1, &cdrom) ) {
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290 return(CD_ERROR);
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291 }
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292
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293 status = SDL_CDcaps.Status(cdrom, NULL);
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294 switch (status) {
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295 case CD_PAUSED:
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296 retval = SDL_CDcaps.Resume(cdrom);
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297 default:
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298 retval = 0;
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299 break;
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300 }
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301 return(retval);
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302 }
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303
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304 int SDL_CDStop(SDL_CD *cdrom)
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305 {
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306 CDstatus status;
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307 int retval;
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308
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309 /* Check if the CD-ROM subsystem has been initialized */
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310 if ( ! CheckInit(1, &cdrom) ) {
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311 return(CD_ERROR);
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312 }
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313
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314 status = SDL_CDcaps.Status(cdrom, NULL);
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315 switch (status) {
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316 case CD_PLAYING:
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317 case CD_PAUSED:
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318 retval = SDL_CDcaps.Stop(cdrom);
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319 default:
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320 retval = 0;
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321 break;
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322 }
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323 return(retval);
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324 }
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325
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326 int SDL_CDEject(SDL_CD *cdrom)
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327 {
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328 /* Check if the CD-ROM subsystem has been initialized */
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329 if ( ! CheckInit(1, &cdrom) ) {
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330 return(CD_ERROR);
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331 }
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332 return(SDL_CDcaps.Eject(cdrom));
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333 }
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334
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335 void SDL_CDClose(SDL_CD *cdrom)
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336 {
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337 /* Check if the CD-ROM subsystem has been initialized */
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338 if ( ! CheckInit(1, &cdrom) ) {
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339 return;
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340 }
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341 SDL_CDcaps.Close(cdrom);
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342 free(cdrom);
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343 default_cdrom = NULL;
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344 }
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345
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346 void SDL_CDROMQuit(void)
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347 {
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348 SDL_SYS_CDQuit();
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349 SDL_cdinitted = 0;
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350 }
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