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annotate src/cdrom/SDL_cdrom.c @ 1221:8ef3e7e92a91
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| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Mon, 02 Jan 2006 19:49:21 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This is the CD-audio control API for Simple DirectMedia Layer */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_cdrom.h" | |
| 36 #include "SDL_syscdrom.h" | |
| 37 | |
| 38 #if !defined(macintosh) | |
| 39 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */ | |
| 40 #endif | |
| 41 | |
| 42 static int SDL_cdinitted = 0; | |
| 43 static SDL_CD *default_cdrom; | |
| 44 | |
| 45 /* The system level CD-ROM control functions */ | |
| 46 struct CDcaps SDL_CDcaps = { | |
| 47 NULL, /* Name */ | |
| 48 NULL, /* Open */ | |
| 49 NULL, /* GetTOC */ | |
| 50 NULL, /* Status */ | |
| 51 NULL, /* Play */ | |
| 52 NULL, /* Pause */ | |
| 53 NULL, /* Resume */ | |
| 54 NULL, /* Stop */ | |
| 55 NULL, /* Eject */ | |
| 56 NULL, /* Close */ | |
| 57 }; | |
| 58 int SDL_numcds; | |
| 59 | |
| 60 int SDL_CDROMInit(void) | |
| 61 { | |
| 62 int retval; | |
| 63 | |
| 64 SDL_numcds = 0; | |
| 65 retval = SDL_SYS_CDInit(); | |
| 66 if ( retval == 0 ) { | |
| 67 SDL_cdinitted = 1; | |
| 68 } | |
| 69 default_cdrom = NULL; | |
| 70 return(retval); | |
| 71 } | |
| 72 | |
| 73 /* Check to see if the CD-ROM subsystem has been initialized */ | |
| 74 static int CheckInit(int check_cdrom, SDL_CD **cdrom) | |
| 75 { | |
| 76 int okay; | |
| 77 | |
| 78 okay = SDL_cdinitted; | |
| 79 if ( check_cdrom && (*cdrom == NULL) ) { | |
| 80 *cdrom = default_cdrom; | |
| 81 if ( *cdrom == NULL ) { | |
| 82 SDL_SetError("CD-ROM not opened"); | |
| 83 okay = 0; | |
| 84 } | |
| 85 } | |
| 86 if ( ! SDL_cdinitted ) { | |
| 87 SDL_SetError("CD-ROM subsystem not initialized"); | |
| 88 } | |
| 89 return(okay); | |
| 90 } | |
| 91 | |
| 92 int SDL_CDNumDrives(void) | |
| 93 { | |
| 94 if ( ! CheckInit(0, NULL) ) { | |
| 95 return(-1); | |
| 96 } | |
| 97 return(SDL_numcds); | |
| 98 } | |
| 99 | |
| 100 const char *SDL_CDName(int drive) | |
| 101 { | |
| 102 if ( ! CheckInit(0, NULL) ) { | |
| 103 return(NULL); | |
| 104 } | |
| 105 if ( drive >= SDL_numcds ) { | |
| 106 SDL_SetError("Invalid CD-ROM drive index"); | |
| 107 return(NULL); | |
| 108 } | |
| 109 if ( SDL_CDcaps.Name ) { | |
| 110 return(SDL_CDcaps.Name(drive)); | |
| 111 } else { | |
| 112 return(""); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 SDL_CD *SDL_CDOpen(int drive) | |
| 117 { | |
| 118 struct SDL_CD *cdrom; | |
| 119 | |
| 120 if ( ! CheckInit(0, NULL) ) { | |
| 121 return(NULL); | |
| 122 } | |
| 123 if ( drive >= SDL_numcds ) { | |
| 124 SDL_SetError("Invalid CD-ROM drive index"); | |
| 125 return(NULL); | |
| 126 } | |
| 127 cdrom = (SDL_CD *)malloc(sizeof(*cdrom)); | |
| 128 if ( cdrom == NULL ) { | |
| 129 SDL_OutOfMemory(); | |
| 130 return(NULL); | |
| 131 } | |
| 132 memset(cdrom, 0, sizeof(*cdrom)); | |
| 133 cdrom->id = SDL_CDcaps.Open(drive); | |
| 134 if ( cdrom->id < 0 ) { | |
| 135 free(cdrom); | |
| 136 return(NULL); | |
| 137 } | |
| 138 default_cdrom = cdrom; | |
| 139 return(cdrom); | |
| 140 } | |
| 141 | |
| 142 CDstatus SDL_CDStatus(SDL_CD *cdrom) | |
| 143 { | |
| 144 CDstatus status; | |
| 145 int i; | |
| 146 Uint32 position; | |
| 147 | |
| 148 /* Check if the CD-ROM subsystem has been initialized */ | |
| 149 if ( ! CheckInit(1, &cdrom) ) { | |
| 150 return(CD_ERROR); | |
| 151 } | |
| 152 | |
| 153 /* Get the current status of the drive */ | |
| 154 cdrom->numtracks = 0; | |
| 155 cdrom->cur_track = 0; | |
| 156 cdrom->cur_frame = 0; | |
| 157 status = SDL_CDcaps.Status(cdrom, &i); | |
| 158 position = (Uint32)i; | |
| 159 cdrom->status = status; | |
| 160 | |
| 161 /* Get the table of contents, if there's a CD available */ | |
| 162 if ( CD_INDRIVE(status) ) { | |
| 163 if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) { | |
| 164 status = CD_ERROR; | |
| 165 } | |
| 166 /* If the drive is playing, get current play position */ | |
| 167 if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) { | |
| 168 for ( i=1; cdrom->track[i].offset <= position; ++i ) { | |
| 169 /* Keep looking */; | |
| 170 } | |
| 171 #ifdef DEBUG_CDROM | |
| 172 fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n", | |
| 173 position, i-1, cdrom->track[i-1].offset); | |
| 174 #endif | |
| 175 cdrom->cur_track = i-1; | |
| 176 position -= cdrom->track[cdrom->cur_track].offset; | |
| 177 cdrom->cur_frame = position; | |
| 178 } | |
| 179 } | |
| 180 return(status); | |
| 181 } | |
| 182 | |
| 183 int SDL_CDPlayTracks(SDL_CD *cdrom, | |
| 184 int strack, int sframe, int ntracks, int nframes) | |
| 185 { | |
| 186 int etrack, eframe; | |
| 187 int start, length; | |
| 188 | |
| 189 /* Check if the CD-ROM subsystem has been initialized */ | |
| 190 if ( ! CheckInit(1, &cdrom) ) { | |
| 191 return(CD_ERROR); | |
| 192 } | |
| 193 | |
| 194 /* Determine the starting and ending tracks */ | |
| 195 if ( (strack < 0) || (strack >= cdrom->numtracks) ) { | |
| 196 SDL_SetError("Invalid starting track"); | |
| 197 return(CD_ERROR); | |
| 198 } | |
| 199 if ( ! ntracks && ! nframes ) { | |
| 200 etrack = cdrom->numtracks; | |
| 201 eframe = 0; | |
| 202 } else { | |
| 203 etrack = strack+ntracks; | |
| 204 if ( etrack == strack ) { | |
| 205 eframe = sframe + nframes; | |
| 206 } else { | |
| 207 eframe = nframes; | |
| 208 } | |
| 209 } | |
| 210 if ( etrack > cdrom->numtracks ) { | |
| 211 SDL_SetError("Invalid play length"); | |
| 212 return(CD_ERROR); | |
| 213 } | |
| 214 | |
| 215 /* Skip data tracks and verify frame offsets */ | |
| 216 while ( (strack <= etrack) && | |
| 217 (cdrom->track[strack].type == SDL_DATA_TRACK) ) { | |
| 218 ++strack; | |
| 219 } | |
| 220 if ( sframe >= (int)cdrom->track[strack].length ) { | |
| 221 SDL_SetError("Invalid starting frame for track %d", strack); | |
| 222 return(CD_ERROR); | |
| 223 } | |
| 224 while ( (etrack > strack) && | |
| 225 (cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) { | |
| 226 --etrack; | |
| 227 } | |
| 228 if ( eframe > (int)cdrom->track[etrack].length ) { | |
| 229 SDL_SetError("Invalid ending frame for track %d", etrack); | |
| 230 return(CD_ERROR); | |
| 231 } | |
| 232 | |
| 233 /* Determine start frame and play length */ | |
| 234 start = (cdrom->track[strack].offset+sframe); | |
| 235 length = (cdrom->track[etrack].offset+eframe)-start; | |
| 236 #ifdef CLIP_FRAMES | |
| 237 /* I've never seen this necessary, but xmcd does it.. */ | |
| 238 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */ | |
| 239 #endif | |
| 240 if ( length < 0 ) { | |
| 241 return(0); | |
| 242 } | |
| 243 | |
| 244 /* Play! */ | |
| 245 #ifdef DEBUG_CDROM | |
| 246 fprintf(stderr, "Playing %d frames at offset %d\n", length, start); | |
| 247 #endif | |
| 248 return(SDL_CDcaps.Play(cdrom, start, length)); | |
| 249 } | |
| 250 | |
| 251 int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length) | |
| 252 { | |
| 253 /* Check if the CD-ROM subsystem has been initialized */ | |
| 254 if ( ! CheckInit(1, &cdrom) ) { | |
| 255 return(CD_ERROR); | |
| 256 } | |
| 257 | |
| 258 return(SDL_CDcaps.Play(cdrom, sframe, length)); | |
| 259 } | |
| 260 | |
| 261 int SDL_CDPause(SDL_CD *cdrom) | |
| 262 { | |
| 263 CDstatus status; | |
| 264 int retval; | |
| 265 | |
| 266 /* Check if the CD-ROM subsystem has been initialized */ | |
| 267 if ( ! CheckInit(1, &cdrom) ) { | |
| 268 return(CD_ERROR); | |
| 269 } | |
| 270 | |
| 271 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 272 switch (status) { | |
| 273 case CD_PLAYING: | |
| 274 retval = SDL_CDcaps.Pause(cdrom); | |
| 275 break; | |
| 276 default: | |
| 277 retval = 0; | |
| 278 break; | |
| 279 } | |
| 280 return(retval); | |
| 281 } | |
| 282 | |
| 283 int SDL_CDResume(SDL_CD *cdrom) | |
| 284 { | |
| 285 CDstatus status; | |
| 286 int retval; | |
| 287 | |
| 288 /* Check if the CD-ROM subsystem has been initialized */ | |
| 289 if ( ! CheckInit(1, &cdrom) ) { | |
| 290 return(CD_ERROR); | |
| 291 } | |
| 292 | |
| 293 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 294 switch (status) { | |
| 295 case CD_PAUSED: | |
| 296 retval = SDL_CDcaps.Resume(cdrom); | |
| 297 default: | |
| 298 retval = 0; | |
| 299 break; | |
| 300 } | |
| 301 return(retval); | |
| 302 } | |
| 303 | |
| 304 int SDL_CDStop(SDL_CD *cdrom) | |
| 305 { | |
| 306 CDstatus status; | |
| 307 int retval; | |
| 308 | |
| 309 /* Check if the CD-ROM subsystem has been initialized */ | |
| 310 if ( ! CheckInit(1, &cdrom) ) { | |
| 311 return(CD_ERROR); | |
| 312 } | |
| 313 | |
| 314 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 315 switch (status) { | |
| 316 case CD_PLAYING: | |
| 317 case CD_PAUSED: | |
| 318 retval = SDL_CDcaps.Stop(cdrom); | |
| 319 default: | |
| 320 retval = 0; | |
| 321 break; | |
| 322 } | |
| 323 return(retval); | |
| 324 } | |
| 325 | |
| 326 int SDL_CDEject(SDL_CD *cdrom) | |
| 327 { | |
| 328 /* Check if the CD-ROM subsystem has been initialized */ | |
| 329 if ( ! CheckInit(1, &cdrom) ) { | |
| 330 return(CD_ERROR); | |
| 331 } | |
| 332 return(SDL_CDcaps.Eject(cdrom)); | |
| 333 } | |
| 334 | |
| 335 void SDL_CDClose(SDL_CD *cdrom) | |
| 336 { | |
| 337 /* Check if the CD-ROM subsystem has been initialized */ | |
| 338 if ( ! CheckInit(1, &cdrom) ) { | |
| 339 return; | |
| 340 } | |
| 341 SDL_CDcaps.Close(cdrom); | |
| 342 free(cdrom); | |
| 343 default_cdrom = NULL; | |
| 344 } | |
| 345 | |
| 346 void SDL_CDROMQuit(void) | |
| 347 { | |
| 348 SDL_SYS_CDQuit(); | |
| 349 SDL_cdinitted = 0; | |
| 350 } |