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comparison src/cdrom/linux/SDL_syscdrom.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children ef23a1bf1244
comparison
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-1:000000000000 0:74212992fb08
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 /* Functions for system-level CD-ROM audio control */
29
30 #include <sys/types.h>
31 #include <stdlib.h>
32 #include <sys/stat.h>
33 #include <sys/ioctl.h>
34 #include <fcntl.h>
35 #include <stdio.h>
36 #include <string.h>
37 #include <errno.h>
38 #include <unistd.h>
39 #ifdef __linux__
40 #include <linux/cdrom.h>
41 #endif
42 #ifdef __SVR4
43 #include <sys/cdio.h>
44 #endif
45
46 /* Define this to use the alternative getmntent() code */
47 #ifndef __SVR4
48 #define USE_MNTENT
49 #endif
50
51 #ifdef USE_MNTENT
52 #if defined(__USLC__)
53 #include <sys/mntent.h>
54 #else
55 #include <mntent.h>
56 #endif
57
58 #ifndef _PATH_MNTTAB
59 #ifdef MNTTAB
60 #define _PATH_MNTTAB MNTTAB
61 #else
62 #define _PATH_MNTTAB "/etc/fstab"
63 #endif
64 #endif /* !_PATH_MNTTAB */
65
66 #ifndef _PATH_MOUNTED
67 #define _PATH_MOUNTED "/etc/mtab"
68 #endif /* !_PATH_MOUNTED */
69
70 #ifndef MNTTYPE_CDROM
71 #define MNTTYPE_CDROM "iso9660"
72 #endif
73 #ifndef MNTTYPE_SUPER
74 #define MNTTYPE_SUPER "supermount"
75 #endif
76 #endif /* USE_MNTENT */
77
78 #include "SDL_error.h"
79 #include "SDL_cdrom.h"
80 #include "SDL_syscdrom.h"
81
82
83 /* The maximum number of CD-ROM drives we'll detect */
84 #define MAX_DRIVES 16
85
86 /* A list of available CD-ROM drives */
87 static char *SDL_cdlist[MAX_DRIVES];
88 static dev_t SDL_cdmode[MAX_DRIVES];
89
90 /* The system-dependent CD control functions */
91 static const char *SDL_SYS_CDName(int drive);
92 static int SDL_SYS_CDOpen(int drive);
93 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
94 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
95 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
96 static int SDL_SYS_CDPause(SDL_CD *cdrom);
97 static int SDL_SYS_CDResume(SDL_CD *cdrom);
98 static int SDL_SYS_CDStop(SDL_CD *cdrom);
99 static int SDL_SYS_CDEject(SDL_CD *cdrom);
100 static void SDL_SYS_CDClose(SDL_CD *cdrom);
101
102 /* Some ioctl() errno values which occur when the tray is empty */
103 #define ERRNO_TRAYEMPTY(errno) \
104 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
105
106 /* Check a drive to see if it is a CD-ROM */
107 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
108 {
109 int is_cd, cdfd;
110 struct cdrom_subchnl info;
111
112 /* If it doesn't exist, return -1 */
113 if ( stat(drive, stbuf) < 0 ) {
114 return(-1);
115 }
116
117 /* If it does exist, verify that it's an available CD-ROM */
118 is_cd = 0;
119 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
120 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
121 if ( cdfd >= 0 ) {
122 info.cdsc_format = CDROM_MSF;
123 /* Under Linux, EIO occurs when a disk is not present.
124 */
125 if ( (ioctl(cdfd, CDROMSUBCHNL, &info) == 0) ||
126 ERRNO_TRAYEMPTY(errno) ) {
127 is_cd = 1;
128 }
129 close(cdfd);
130 }
131 #ifdef USE_MNTENT
132 /* Even if we can't read it, it might be mounted */
133 else if ( mnttype && (strcmp(mnttype, MNTTYPE_CDROM) == 0) ) {
134 is_cd = 1;
135 }
136 #endif
137 }
138 return(is_cd);
139 }
140
141 /* Add a CD-ROM drive to our list of valid drives */
142 static void AddDrive(char *drive, struct stat *stbuf)
143 {
144 int i;
145
146 if ( SDL_numcds < MAX_DRIVES ) {
147 /* Check to make sure it's not already in our list.
148 This can happen when we see a drive via symbolic link.
149 */
150 for ( i=0; i<SDL_numcds; ++i ) {
151 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
152 #ifdef DEBUG_CDROM
153 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
154 #endif
155 return;
156 }
157 }
158
159 /* Add this drive to our list */
160 i = SDL_numcds;
161 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
162 if ( SDL_cdlist[i] == NULL ) {
163 SDL_OutOfMemory();
164 return;
165 }
166 strcpy(SDL_cdlist[i], drive);
167 SDL_cdmode[i] = stbuf->st_rdev;
168 ++SDL_numcds;
169 #ifdef DEBUG_CDROM
170 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
171 #endif
172 }
173 }
174
175 #ifdef USE_MNTENT
176 static void CheckMounts(const char *mtab)
177 {
178 FILE *mntfp;
179 struct mntent *mntent;
180 struct stat stbuf;
181
182 mntfp = setmntent(mtab, "r");
183 if ( mntfp != NULL ) {
184 char *tmp, mnt_type[32], mnt_dev[1024];
185
186 while ( (mntent=getmntent(mntfp)) != NULL ) {
187 /* Warning, possible buffer overflow.. */
188 strcpy(mnt_type, mntent->mnt_type);
189 strcpy(mnt_dev, mntent->mnt_fsname);
190
191 /* Handle "supermount" filesystem mounts */
192 if ( strcmp(mnt_type, MNTTYPE_SUPER) == 0 ) {
193 tmp = strstr(mntent->mnt_opts, "fs=");
194 if ( tmp ) {
195 strcpy(mnt_type, tmp+strlen("fs="));
196 tmp = strchr(mnt_type, ',');
197 if ( tmp ) {
198 *tmp = '\0';
199 }
200 }
201 tmp = strstr(mntent->mnt_opts, "dev=");
202 if ( tmp ) {
203 strcpy(mnt_dev, tmp+strlen("dev="));
204 tmp = strchr(mnt_dev, ',');
205 if ( tmp ) {
206 *tmp = '\0';
207 }
208 }
209 }
210 if ( strcmp(mnt_type, MNTTYPE_CDROM) == 0 ) {
211 #ifdef DEBUG_CDROM
212 fprintf(stderr, "Checking mount path from %s: %s mounted on %s of %s\n",
213 mtab, mnt_dev, mntent->mnt_dir, mnt_type);
214 #endif
215 if (CheckDrive(mnt_dev, mnt_type, &stbuf) > 0) {
216 AddDrive(mnt_dev, &stbuf);
217 }
218 }
219 }
220 endmntent(mntfp);
221 }
222 }
223 #endif /* USE_MNTENT */
224
225 int SDL_SYS_CDInit(void)
226 {
227 /* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
228 static char *checklist[] = {
229 "cdrom", "?a hd?", "?0 scd?", "?0 sr?", NULL
230 };
231 char *SDLcdrom;
232 int i, j, exists;
233 char drive[32];
234 struct stat stbuf;
235
236 /* Fill in our driver capabilities */
237 SDL_CDcaps.Name = SDL_SYS_CDName;
238 SDL_CDcaps.Open = SDL_SYS_CDOpen;
239 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
240 SDL_CDcaps.Status = SDL_SYS_CDStatus;
241 SDL_CDcaps.Play = SDL_SYS_CDPlay;
242 SDL_CDcaps.Pause = SDL_SYS_CDPause;
243 SDL_CDcaps.Resume = SDL_SYS_CDResume;
244 SDL_CDcaps.Stop = SDL_SYS_CDStop;
245 SDL_CDcaps.Eject = SDL_SYS_CDEject;
246 SDL_CDcaps.Close = SDL_SYS_CDClose;
247
248 /* Look in the environment for our CD-ROM drive list */
249 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
250 if ( SDLcdrom != NULL ) {
251 char *cdpath, *delim;
252 cdpath = malloc(strlen(SDLcdrom)+1);
253 if ( cdpath != NULL ) {
254 strcpy(cdpath, SDLcdrom);
255 SDLcdrom = cdpath;
256 do {
257 delim = strchr(SDLcdrom, ':');
258 if ( delim ) {
259 *delim++ = '\0';
260 }
261 #ifdef DEBUG_CDROM
262 fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
263 #endif
264 if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
265 AddDrive(SDLcdrom, &stbuf);
266 }
267 if ( delim ) {
268 SDLcdrom = delim;
269 } else {
270 SDLcdrom = NULL;
271 }
272 } while ( SDLcdrom );
273 free(cdpath);
274 }
275
276 /* If we found our drives, there's nothing left to do */
277 if ( SDL_numcds > 0 ) {
278 return(0);
279 }
280 }
281
282 #ifdef USE_MNTENT
283 /* Check /dev/cdrom first :-) */
284 if (CheckDrive("/dev/cdrom", NULL, &stbuf) > 0) {
285 AddDrive("/dev/cdrom", &stbuf);
286 }
287
288 /* Now check the currently mounted CD drives */
289 CheckMounts(_PATH_MOUNTED);
290
291 /* Finally check possible mountable drives in /etc/fstab */
292 CheckMounts(_PATH_MNTTAB);
293
294 /* If we found our drives, there's nothing left to do */
295 if ( SDL_numcds > 0 ) {
296 return(0);
297 }
298 #endif /* USE_MNTENT */
299
300 /* Scan the system for CD-ROM drives.
301 Not always 100% reliable, so use the USE_MNTENT code above first.
302 */
303 for ( i=0; checklist[i]; ++i ) {
304 if ( checklist[i][0] == '?' ) {
305 char *insert;
306 exists = 1;
307 for ( j=checklist[i][1]; exists; ++j ) {
308 sprintf(drive, "/dev/%s", &checklist[i][3]);
309 insert = strchr(drive, '?');
310 if ( insert != NULL ) {
311 *insert = j;
312 }
313 #ifdef DEBUG_CDROM
314 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
315 #endif
316 switch (CheckDrive(drive, NULL, &stbuf)) {
317 /* Drive exists and is a CD-ROM */
318 case 1:
319 AddDrive(drive, &stbuf);
320 break;
321 /* Drive exists, but isn't a CD-ROM */
322 case 0:
323 break;
324 /* Drive doesn't exist */
325 case -1:
326 exists = 0;
327 break;
328 }
329 }
330 } else {
331 sprintf(drive, "/dev/%s", checklist[i]);
332 #ifdef DEBUG_CDROM
333 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
334 #endif
335 if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
336 AddDrive(drive, &stbuf);
337 }
338 }
339 }
340 return(0);
341 }
342
343 /* General ioctl() CD-ROM command function */
344 static int SDL_SYS_CDioctl(int id, int command, void *arg)
345 {
346 int retval;
347
348 retval = ioctl(id, command, arg);
349 if ( retval < 0 ) {
350 SDL_SetError("ioctl() error: %s", strerror(errno));
351 }
352 return(retval);
353 }
354
355 static const char *SDL_SYS_CDName(int drive)
356 {
357 return(SDL_cdlist[drive]);
358 }
359
360 static int SDL_SYS_CDOpen(int drive)
361 {
362 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
363 }
364
365 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
366 {
367 struct cdrom_tochdr toc;
368 int i, okay;
369 struct cdrom_tocentry entry;
370
371 okay = 0;
372 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0 ) {
373 cdrom->numtracks = toc.cdth_trk1-toc.cdth_trk0+1;
374 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
375 cdrom->numtracks = SDL_MAX_TRACKS;
376 }
377 /* Read all the track TOC entries */
378 for ( i=0; i<=cdrom->numtracks; ++i ) {
379 if ( i == cdrom->numtracks ) {
380 cdrom->track[i].id = CDROM_LEADOUT;
381 } else {
382 cdrom->track[i].id = toc.cdth_trk0+i;
383 }
384 entry.cdte_track = cdrom->track[i].id;
385 entry.cdte_format = CDROM_MSF;
386 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY,
387 &entry) < 0 ) {
388 break;
389 } else {
390 if ( entry.cdte_ctrl & CDROM_DATA_TRACK ) {
391 cdrom->track[i].type = SDL_DATA_TRACK;
392 } else {
393 cdrom->track[i].type = SDL_AUDIO_TRACK;
394 }
395 cdrom->track[i].offset = MSF_TO_FRAMES(
396 entry.cdte_addr.msf.minute,
397 entry.cdte_addr.msf.second,
398 entry.cdte_addr.msf.frame);
399 cdrom->track[i].length = 0;
400 if ( i > 0 ) {
401 cdrom->track[i-1].length =
402 cdrom->track[i].offset-
403 cdrom->track[i-1].offset;
404 }
405 }
406 }
407 if ( i == (cdrom->numtracks+1) ) {
408 okay = 1;
409 }
410 }
411 return(okay ? 0 : -1);
412 }
413
414 /* Get CD-ROM status */
415 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
416 {
417 CDstatus status;
418 struct cdrom_tochdr toc;
419 struct cdrom_subchnl info;
420
421 info.cdsc_format = CDROM_MSF;
422 if ( ioctl(cdrom->id, CDROMSUBCHNL, &info) < 0 ) {
423 if ( ERRNO_TRAYEMPTY(errno) ) {
424 status = CD_TRAYEMPTY;
425 } else {
426 status = CD_ERROR;
427 }
428 } else {
429 switch (info.cdsc_audiostatus) {
430 case CDROM_AUDIO_INVALID:
431 case CDROM_AUDIO_NO_STATUS:
432 /* Try to determine if there's a CD available */
433 if (ioctl(cdrom->id, CDROMREADTOCHDR, &toc)==0)
434 status = CD_STOPPED;
435 else
436 status = CD_TRAYEMPTY;
437 break;
438 case CDROM_AUDIO_COMPLETED:
439 status = CD_STOPPED;
440 break;
441 case CDROM_AUDIO_PLAY:
442 status = CD_PLAYING;
443 break;
444 case CDROM_AUDIO_PAUSED:
445 /* Workaround buggy CD-ROM drive */
446 if ( info.cdsc_trk == CDROM_LEADOUT ) {
447 status = CD_STOPPED;
448 } else {
449 status = CD_PAUSED;
450 }
451 break;
452 default:
453 status = CD_ERROR;
454 break;
455 }
456 }
457 if ( position ) {
458 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
459 *position = MSF_TO_FRAMES(
460 info.cdsc_absaddr.msf.minute,
461 info.cdsc_absaddr.msf.second,
462 info.cdsc_absaddr.msf.frame);
463 } else {
464 *position = 0;
465 }
466 }
467 return(status);
468 }
469
470 /* Start play */
471 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
472 {
473 struct cdrom_msf playtime;
474
475 FRAMES_TO_MSF(start,
476 &playtime.cdmsf_min0, &playtime.cdmsf_sec0, &playtime.cdmsf_frame0);
477 FRAMES_TO_MSF(start+length,
478 &playtime.cdmsf_min1, &playtime.cdmsf_sec1, &playtime.cdmsf_frame1);
479 #ifdef DEBUG_CDROM
480 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
481 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
482 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
483 #endif
484 return(SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime));
485 }
486
487 /* Pause play */
488 static int SDL_SYS_CDPause(SDL_CD *cdrom)
489 {
490 return(SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0));
491 }
492
493 /* Resume play */
494 static int SDL_SYS_CDResume(SDL_CD *cdrom)
495 {
496 return(SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0));
497 }
498
499 /* Stop play */
500 static int SDL_SYS_CDStop(SDL_CD *cdrom)
501 {
502 return(SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0));
503 }
504
505 /* Eject the CD-ROM */
506 static int SDL_SYS_CDEject(SDL_CD *cdrom)
507 {
508 return(SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0));
509 }
510
511 /* Close the CD-ROM handle */
512 static void SDL_SYS_CDClose(SDL_CD *cdrom)
513 {
514 close(cdrom->id);
515 }
516
517 void SDL_SYS_CDQuit(void)
518 {
519 int i;
520
521 if ( SDL_numcds > 0 ) {
522 for ( i=0; i<SDL_numcds; ++i ) {
523 free(SDL_cdlist[i]);
524 }
525 SDL_numcds = 0;
526 }
527 }
528