Mercurial > sdl-ios-xcode
annotate src/cdrom/SDL_cdrom.c @ 4227:c5ee6a0d7916 SDL-1.2
Fix for expression error by Torsten Giebl - Thanks! :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 21 Sep 2009 11:48:03 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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parents:
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15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* This is the CD-audio control API for Simple DirectMedia Layer */ | |
| 25 | |
| 26 #include "SDL_cdrom.h" | |
| 27 #include "SDL_syscdrom.h" | |
| 28 | |
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29 #if !defined(__MACOS__) |
| 0 | 30 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */ |
| 31 #endif | |
| 32 | |
| 33 static int SDL_cdinitted = 0; | |
| 34 static SDL_CD *default_cdrom; | |
| 35 | |
| 36 /* The system level CD-ROM control functions */ | |
| 37 struct CDcaps SDL_CDcaps = { | |
| 38 NULL, /* Name */ | |
| 39 NULL, /* Open */ | |
| 40 NULL, /* GetTOC */ | |
| 41 NULL, /* Status */ | |
| 42 NULL, /* Play */ | |
| 43 NULL, /* Pause */ | |
| 44 NULL, /* Resume */ | |
| 45 NULL, /* Stop */ | |
| 46 NULL, /* Eject */ | |
| 47 NULL, /* Close */ | |
| 48 }; | |
| 49 int SDL_numcds; | |
| 50 | |
| 51 int SDL_CDROMInit(void) | |
| 52 { | |
| 53 int retval; | |
| 54 | |
| 55 SDL_numcds = 0; | |
| 56 retval = SDL_SYS_CDInit(); | |
| 57 if ( retval == 0 ) { | |
| 58 SDL_cdinitted = 1; | |
| 59 } | |
| 60 default_cdrom = NULL; | |
| 61 return(retval); | |
| 62 } | |
| 63 | |
| 64 /* Check to see if the CD-ROM subsystem has been initialized */ | |
| 65 static int CheckInit(int check_cdrom, SDL_CD **cdrom) | |
| 66 { | |
| 67 int okay; | |
| 68 | |
| 69 okay = SDL_cdinitted; | |
| 70 if ( check_cdrom && (*cdrom == NULL) ) { | |
| 71 *cdrom = default_cdrom; | |
| 72 if ( *cdrom == NULL ) { | |
| 73 SDL_SetError("CD-ROM not opened"); | |
| 74 okay = 0; | |
| 75 } | |
| 76 } | |
| 77 if ( ! SDL_cdinitted ) { | |
| 78 SDL_SetError("CD-ROM subsystem not initialized"); | |
| 79 } | |
| 80 return(okay); | |
| 81 } | |
| 82 | |
| 83 int SDL_CDNumDrives(void) | |
| 84 { | |
| 85 if ( ! CheckInit(0, NULL) ) { | |
| 86 return(-1); | |
| 87 } | |
| 88 return(SDL_numcds); | |
| 89 } | |
| 90 | |
| 91 const char *SDL_CDName(int drive) | |
| 92 { | |
| 93 if ( ! CheckInit(0, NULL) ) { | |
| 94 return(NULL); | |
| 95 } | |
| 96 if ( drive >= SDL_numcds ) { | |
| 97 SDL_SetError("Invalid CD-ROM drive index"); | |
| 98 return(NULL); | |
| 99 } | |
| 100 if ( SDL_CDcaps.Name ) { | |
| 101 return(SDL_CDcaps.Name(drive)); | |
| 102 } else { | |
| 103 return(""); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 SDL_CD *SDL_CDOpen(int drive) | |
| 108 { | |
| 109 struct SDL_CD *cdrom; | |
| 110 | |
| 111 if ( ! CheckInit(0, NULL) ) { | |
| 112 return(NULL); | |
| 113 } | |
| 114 if ( drive >= SDL_numcds ) { | |
| 115 SDL_SetError("Invalid CD-ROM drive index"); | |
| 116 return(NULL); | |
| 117 } | |
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118 cdrom = (SDL_CD *)SDL_malloc(sizeof(*cdrom)); |
| 0 | 119 if ( cdrom == NULL ) { |
| 120 SDL_OutOfMemory(); | |
| 121 return(NULL); | |
| 122 } | |
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123 SDL_memset(cdrom, 0, sizeof(*cdrom)); |
| 0 | 124 cdrom->id = SDL_CDcaps.Open(drive); |
| 125 if ( cdrom->id < 0 ) { | |
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parents:
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126 SDL_free(cdrom); |
| 0 | 127 return(NULL); |
| 128 } | |
| 129 default_cdrom = cdrom; | |
| 130 return(cdrom); | |
| 131 } | |
| 132 | |
| 133 CDstatus SDL_CDStatus(SDL_CD *cdrom) | |
| 134 { | |
| 135 CDstatus status; | |
| 136 int i; | |
| 137 Uint32 position; | |
| 138 | |
| 139 /* Check if the CD-ROM subsystem has been initialized */ | |
| 140 if ( ! CheckInit(1, &cdrom) ) { | |
| 141 return(CD_ERROR); | |
| 142 } | |
| 143 | |
| 144 /* Get the current status of the drive */ | |
| 145 cdrom->numtracks = 0; | |
| 146 cdrom->cur_track = 0; | |
| 147 cdrom->cur_frame = 0; | |
| 148 status = SDL_CDcaps.Status(cdrom, &i); | |
| 149 position = (Uint32)i; | |
| 150 cdrom->status = status; | |
| 151 | |
| 152 /* Get the table of contents, if there's a CD available */ | |
| 153 if ( CD_INDRIVE(status) ) { | |
| 154 if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) { | |
| 155 status = CD_ERROR; | |
| 156 } | |
| 157 /* If the drive is playing, get current play position */ | |
| 158 if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) { | |
| 159 for ( i=1; cdrom->track[i].offset <= position; ++i ) { | |
| 160 /* Keep looking */; | |
| 161 } | |
| 162 #ifdef DEBUG_CDROM | |
| 163 fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n", | |
| 164 position, i-1, cdrom->track[i-1].offset); | |
| 165 #endif | |
| 166 cdrom->cur_track = i-1; | |
| 167 position -= cdrom->track[cdrom->cur_track].offset; | |
| 168 cdrom->cur_frame = position; | |
| 169 } | |
| 170 } | |
| 171 return(status); | |
| 172 } | |
| 173 | |
| 174 int SDL_CDPlayTracks(SDL_CD *cdrom, | |
| 175 int strack, int sframe, int ntracks, int nframes) | |
| 176 { | |
| 177 int etrack, eframe; | |
| 178 int start, length; | |
| 179 | |
| 180 /* Check if the CD-ROM subsystem has been initialized */ | |
| 181 if ( ! CheckInit(1, &cdrom) ) { | |
| 182 return(CD_ERROR); | |
| 183 } | |
| 184 | |
| 185 /* Determine the starting and ending tracks */ | |
| 186 if ( (strack < 0) || (strack >= cdrom->numtracks) ) { | |
| 187 SDL_SetError("Invalid starting track"); | |
| 188 return(CD_ERROR); | |
| 189 } | |
| 190 if ( ! ntracks && ! nframes ) { | |
| 191 etrack = cdrom->numtracks; | |
| 192 eframe = 0; | |
| 193 } else { | |
| 194 etrack = strack+ntracks; | |
| 195 if ( etrack == strack ) { | |
| 196 eframe = sframe + nframes; | |
| 197 } else { | |
| 198 eframe = nframes; | |
| 199 } | |
| 200 } | |
| 201 if ( etrack > cdrom->numtracks ) { | |
| 202 SDL_SetError("Invalid play length"); | |
| 203 return(CD_ERROR); | |
| 204 } | |
| 205 | |
| 206 /* Skip data tracks and verify frame offsets */ | |
| 207 while ( (strack <= etrack) && | |
| 208 (cdrom->track[strack].type == SDL_DATA_TRACK) ) { | |
| 209 ++strack; | |
| 210 } | |
| 211 if ( sframe >= (int)cdrom->track[strack].length ) { | |
| 212 SDL_SetError("Invalid starting frame for track %d", strack); | |
| 213 return(CD_ERROR); | |
| 214 } | |
| 215 while ( (etrack > strack) && | |
| 216 (cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) { | |
| 217 --etrack; | |
| 218 } | |
| 219 if ( eframe > (int)cdrom->track[etrack].length ) { | |
| 220 SDL_SetError("Invalid ending frame for track %d", etrack); | |
| 221 return(CD_ERROR); | |
| 222 } | |
| 223 | |
| 224 /* Determine start frame and play length */ | |
| 225 start = (cdrom->track[strack].offset+sframe); | |
| 226 length = (cdrom->track[etrack].offset+eframe)-start; | |
| 227 #ifdef CLIP_FRAMES | |
| 228 /* I've never seen this necessary, but xmcd does it.. */ | |
| 229 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */ | |
| 230 #endif | |
| 231 if ( length < 0 ) { | |
| 232 return(0); | |
| 233 } | |
| 234 | |
| 235 /* Play! */ | |
| 236 #ifdef DEBUG_CDROM | |
| 237 fprintf(stderr, "Playing %d frames at offset %d\n", length, start); | |
| 238 #endif | |
| 239 return(SDL_CDcaps.Play(cdrom, start, length)); | |
| 240 } | |
| 241 | |
| 242 int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length) | |
| 243 { | |
| 244 /* Check if the CD-ROM subsystem has been initialized */ | |
| 245 if ( ! CheckInit(1, &cdrom) ) { | |
| 246 return(CD_ERROR); | |
| 247 } | |
| 248 | |
| 249 return(SDL_CDcaps.Play(cdrom, sframe, length)); | |
| 250 } | |
| 251 | |
| 252 int SDL_CDPause(SDL_CD *cdrom) | |
| 253 { | |
| 254 CDstatus status; | |
| 255 int retval; | |
| 256 | |
| 257 /* Check if the CD-ROM subsystem has been initialized */ | |
| 258 if ( ! CheckInit(1, &cdrom) ) { | |
| 259 return(CD_ERROR); | |
| 260 } | |
| 261 | |
| 262 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 263 switch (status) { | |
| 264 case CD_PLAYING: | |
| 265 retval = SDL_CDcaps.Pause(cdrom); | |
| 266 break; | |
| 267 default: | |
| 268 retval = 0; | |
| 269 break; | |
| 270 } | |
| 271 return(retval); | |
| 272 } | |
| 273 | |
| 274 int SDL_CDResume(SDL_CD *cdrom) | |
| 275 { | |
| 276 CDstatus status; | |
| 277 int retval; | |
| 278 | |
| 279 /* Check if the CD-ROM subsystem has been initialized */ | |
| 280 if ( ! CheckInit(1, &cdrom) ) { | |
| 281 return(CD_ERROR); | |
| 282 } | |
| 283 | |
| 284 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 285 switch (status) { | |
| 286 case CD_PAUSED: | |
| 287 retval = SDL_CDcaps.Resume(cdrom); | |
| 288 default: | |
| 289 retval = 0; | |
| 290 break; | |
| 291 } | |
| 292 return(retval); | |
| 293 } | |
| 294 | |
| 295 int SDL_CDStop(SDL_CD *cdrom) | |
| 296 { | |
| 297 CDstatus status; | |
| 298 int retval; | |
| 299 | |
| 300 /* Check if the CD-ROM subsystem has been initialized */ | |
| 301 if ( ! CheckInit(1, &cdrom) ) { | |
| 302 return(CD_ERROR); | |
| 303 } | |
| 304 | |
| 305 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 306 switch (status) { | |
| 307 case CD_PLAYING: | |
| 308 case CD_PAUSED: | |
| 309 retval = SDL_CDcaps.Stop(cdrom); | |
| 310 default: | |
| 311 retval = 0; | |
| 312 break; | |
| 313 } | |
| 314 return(retval); | |
| 315 } | |
| 316 | |
| 317 int SDL_CDEject(SDL_CD *cdrom) | |
| 318 { | |
| 319 /* Check if the CD-ROM subsystem has been initialized */ | |
| 320 if ( ! CheckInit(1, &cdrom) ) { | |
| 321 return(CD_ERROR); | |
| 322 } | |
| 323 return(SDL_CDcaps.Eject(cdrom)); | |
| 324 } | |
| 325 | |
| 326 void SDL_CDClose(SDL_CD *cdrom) | |
| 327 { | |
| 328 /* Check if the CD-ROM subsystem has been initialized */ | |
| 329 if ( ! CheckInit(1, &cdrom) ) { | |
| 330 return; | |
| 331 } | |
| 332 SDL_CDcaps.Close(cdrom); | |
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parents:
1330
diff
changeset
|
333 SDL_free(cdrom); |
| 0 | 334 default_cdrom = NULL; |
| 335 } | |
| 336 | |
| 337 void SDL_CDROMQuit(void) | |
| 338 { | |
| 339 SDL_SYS_CDQuit(); | |
| 340 SDL_cdinitted = 0; | |
| 341 } |