2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "SDL_config.h"
24 #ifdef SDL_CDROM_LINUX
26 /* Functions for system-level CD-ROM audio control */
28 #include <string.h> /* For strerror() */
29 #include <sys/types.h>
31 #include <sys/ioctl.h>
36 #ifdef HAVE_LINUX_VERSION_H
37 /* linux 2.6.9 workaround */
38 #include <linux/version.h>
39 #if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,9)
40 #include <asm/types.h>
47 #endif /* linux 2.6.9 workaround */
48 #endif /* HAVE_LINUX_VERSION_H */
49 #include <linux/cdrom.h>
55 /* Define this to use the alternative getmntent() code */
62 #include <sys/mntent.h>
69 #define _PATH_MNTTAB MNTTAB
71 #define _PATH_MNTTAB "/etc/fstab"
73 #endif /* !_PATH_MNTTAB */
76 #define _PATH_MOUNTED "/etc/mtab"
77 #endif /* !_PATH_MOUNTED */
80 #define MNTTYPE_CDROM "iso9660"
83 #define MNTTYPE_SUPER "supermount"
85 #endif /* USE_MNTENT */
87 #include "SDL_cdrom.h"
88 #include "../SDL_syscdrom.h"
91 /* The maximum number of CD-ROM drives we'll detect */
94 /* A list of available CD-ROM drives */
95 static char *SDL_cdlist[MAX_DRIVES];
96 static dev_t SDL_cdmode[MAX_DRIVES];
98 /* The system-dependent CD control functions */
99 static const char *SDL_SYS_CDName(int drive);
100 static int SDL_SYS_CDOpen(int drive);
101 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
102 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
103 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
104 static int SDL_SYS_CDPause(SDL_CD *cdrom);
105 static int SDL_SYS_CDResume(SDL_CD *cdrom);
106 static int SDL_SYS_CDStop(SDL_CD *cdrom);
107 static int SDL_SYS_CDEject(SDL_CD *cdrom);
108 static void SDL_SYS_CDClose(SDL_CD *cdrom);
110 /* Some ioctl() errno values which occur when the tray is empty */
112 #define ENOMEDIUM ENOENT
114 #define ERRNO_TRAYEMPTY(errno) \
115 ((errno == EIO) || (errno == ENOENT) || \
116 (errno == EINVAL) || (errno == ENOMEDIUM))
118 /* Check a drive to see if it is a CD-ROM */
119 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
122 struct cdrom_subchnl info;
124 /* If it doesn't exist, return -1 */
125 if ( stat(drive, stbuf) < 0 ) {
129 /* If it does exist, verify that it's an available CD-ROM */
131 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
132 cdfd = open(drive, (O_RDONLY|O_NONBLOCK), 0);
134 info.cdsc_format = CDROM_MSF;
135 /* Under Linux, EIO occurs when a disk is not present.
137 if ( (ioctl(cdfd, CDROMSUBCHNL, &info) == 0) ||
138 ERRNO_TRAYEMPTY(errno) ) {
144 /* Even if we can't read it, it might be mounted */
145 else if ( mnttype && (SDL_strcmp(mnttype, MNTTYPE_CDROM) == 0) ) {
153 /* Add a CD-ROM drive to our list of valid drives */
154 static void AddDrive(char *drive, struct stat *stbuf)
158 if ( SDL_numcds < MAX_DRIVES ) {
159 /* Check to make sure it's not already in our list.
160 This can happen when we see a drive via symbolic link.
162 for ( i=0; i<SDL_numcds; ++i ) {
163 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
165 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
171 /* Add this drive to our list */
173 SDL_cdlist[i] = SDL_strdup(drive);
174 if ( SDL_cdlist[i] == NULL ) {
178 SDL_cdmode[i] = stbuf->st_rdev;
181 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
187 static void CheckMounts(const char *mtab)
190 struct mntent *mntent;
193 mntfp = setmntent(mtab, "r");
194 if ( mntfp != NULL ) {
201 while ( (mntent=getmntent(mntfp)) != NULL ) {
202 mnt_type_len = SDL_strlen(mntent->mnt_type) + 1;
203 mnt_type = SDL_stack_alloc(char, mnt_type_len);
204 if (mnt_type == NULL)
205 continue; /* maybe you'll get lucky next time. */
207 mnt_dev_len = SDL_strlen(mntent->mnt_fsname) + 1;
208 mnt_dev = SDL_stack_alloc(char, mnt_dev_len);
209 if (mnt_dev == NULL) {
210 SDL_stack_free(mnt_type);
214 SDL_strlcpy(mnt_type, mntent->mnt_type, mnt_type_len);
215 SDL_strlcpy(mnt_dev, mntent->mnt_fsname, mnt_dev_len);
217 /* Handle "supermount" filesystem mounts */
218 if ( SDL_strcmp(mnt_type, MNTTYPE_SUPER) == 0 ) {
219 tmp = SDL_strstr(mntent->mnt_opts, "fs=");
221 SDL_stack_free(mnt_type);
222 mnt_type = SDL_strdup(tmp + SDL_strlen("fs="));
224 tmp = SDL_strchr(mnt_type, ',');
230 tmp = SDL_strstr(mntent->mnt_opts, "dev=");
232 SDL_stack_free(mnt_dev);
233 mnt_dev = SDL_strdup(tmp + SDL_strlen("dev="));
235 tmp = SDL_strchr(mnt_dev, ',');
242 if ( SDL_strcmp(mnt_type, MNTTYPE_CDROM) == 0 ) {
244 fprintf(stderr, "Checking mount path from %s: %s mounted on %s of %s\n",
245 mtab, mnt_dev, mntent->mnt_dir, mnt_type);
247 if (CheckDrive(mnt_dev, mnt_type, &stbuf) > 0) {
248 AddDrive(mnt_dev, &stbuf);
251 SDL_stack_free(mnt_dev);
252 SDL_stack_free(mnt_type);
257 #endif /* USE_MNTENT */
259 int SDL_SYS_CDInit(void)
261 /* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
262 static char *checklist[] = {
263 "cdrom", "?a hd?", "?0 scd?", "?0 sr?", NULL
270 /* Fill in our driver capabilities */
271 SDL_CDcaps.Name = SDL_SYS_CDName;
272 SDL_CDcaps.Open = SDL_SYS_CDOpen;
273 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
274 SDL_CDcaps.Status = SDL_SYS_CDStatus;
275 SDL_CDcaps.Play = SDL_SYS_CDPlay;
276 SDL_CDcaps.Pause = SDL_SYS_CDPause;
277 SDL_CDcaps.Resume = SDL_SYS_CDResume;
278 SDL_CDcaps.Stop = SDL_SYS_CDStop;
279 SDL_CDcaps.Eject = SDL_SYS_CDEject;
280 SDL_CDcaps.Close = SDL_SYS_CDClose;
282 /* Look in the environment for our CD-ROM drive list */
283 SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
284 if ( SDLcdrom != NULL ) {
285 char *cdpath, *delim;
286 size_t len = SDL_strlen(SDLcdrom)+1;
287 cdpath = SDL_stack_alloc(char, len);
288 if ( cdpath != NULL ) {
289 SDL_strlcpy(cdpath, SDLcdrom, len);
292 delim = SDL_strchr(SDLcdrom, ':');
297 fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
299 if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
300 AddDrive(SDLcdrom, &stbuf);
307 } while ( SDLcdrom );
308 SDL_stack_free(cdpath);
311 /* If we found our drives, there's nothing left to do */
312 if ( SDL_numcds > 0 ) {
318 /* Check /dev/cdrom first :-) */
319 if (CheckDrive("/dev/cdrom", NULL, &stbuf) > 0) {
320 AddDrive("/dev/cdrom", &stbuf);
323 /* Now check the currently mounted CD drives */
324 CheckMounts(_PATH_MOUNTED);
326 /* Finally check possible mountable drives in /etc/fstab */
327 CheckMounts(_PATH_MNTTAB);
329 /* If we found our drives, there's nothing left to do */
330 if ( SDL_numcds > 0 ) {
333 #endif /* USE_MNTENT */
335 /* Scan the system for CD-ROM drives.
336 Not always 100% reliable, so use the USE_MNTENT code above first.
338 for ( i=0; checklist[i]; ++i ) {
339 if ( checklist[i][0] == '?' ) {
342 for ( j=checklist[i][1]; exists; ++j ) {
343 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", &checklist[i][3]);
344 insert = SDL_strchr(drive, '?');
345 if ( insert != NULL ) {
349 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
351 switch (CheckDrive(drive, NULL, &stbuf)) {
352 /* Drive exists and is a CD-ROM */
354 AddDrive(drive, &stbuf);
356 /* Drive exists, but isn't a CD-ROM */
359 /* Drive doesn't exist */
366 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);
368 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
370 if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
371 AddDrive(drive, &stbuf);
378 /* General ioctl() CD-ROM command function */
379 static int SDL_SYS_CDioctl(int id, int command, void *arg)
383 retval = ioctl(id, command, arg);
385 SDL_SetError("ioctl() error: %s", strerror(errno));
390 static const char *SDL_SYS_CDName(int drive)
392 return(SDL_cdlist[drive]);
395 static int SDL_SYS_CDOpen(int drive)
397 return(open(SDL_cdlist[drive], (O_RDONLY|O_NONBLOCK), 0));
400 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
402 struct cdrom_tochdr toc;
404 struct cdrom_tocentry entry;
407 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0 ) {
408 cdrom->numtracks = toc.cdth_trk1-toc.cdth_trk0+1;
409 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
410 cdrom->numtracks = SDL_MAX_TRACKS;
412 /* Read all the track TOC entries */
413 for ( i=0; i<=cdrom->numtracks; ++i ) {
414 if ( i == cdrom->numtracks ) {
415 cdrom->track[i].id = CDROM_LEADOUT;
417 cdrom->track[i].id = toc.cdth_trk0+i;
419 entry.cdte_track = cdrom->track[i].id;
420 entry.cdte_format = CDROM_MSF;
421 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY,
425 if ( entry.cdte_ctrl & CDROM_DATA_TRACK ) {
426 cdrom->track[i].type = SDL_DATA_TRACK;
428 cdrom->track[i].type = SDL_AUDIO_TRACK;
430 cdrom->track[i].offset = MSF_TO_FRAMES(
431 entry.cdte_addr.msf.minute,
432 entry.cdte_addr.msf.second,
433 entry.cdte_addr.msf.frame);
434 cdrom->track[i].length = 0;
436 cdrom->track[i-1].length =
437 cdrom->track[i].offset-
438 cdrom->track[i-1].offset;
442 if ( i == (cdrom->numtracks+1) ) {
446 return(okay ? 0 : -1);
449 /* Get CD-ROM status */
450 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
453 struct cdrom_tochdr toc;
454 struct cdrom_subchnl info;
456 info.cdsc_format = CDROM_MSF;
457 if ( ioctl(cdrom->id, CDROMSUBCHNL, &info) < 0 ) {
458 if ( ERRNO_TRAYEMPTY(errno) ) {
459 status = CD_TRAYEMPTY;
464 switch (info.cdsc_audiostatus) {
465 case CDROM_AUDIO_INVALID:
466 case CDROM_AUDIO_NO_STATUS:
467 /* Try to determine if there's a CD available */
468 if (ioctl(cdrom->id, CDROMREADTOCHDR, &toc)==0)
471 status = CD_TRAYEMPTY;
473 case CDROM_AUDIO_COMPLETED:
476 case CDROM_AUDIO_PLAY:
479 case CDROM_AUDIO_PAUSED:
480 /* Workaround buggy CD-ROM drive */
481 if ( info.cdsc_trk == CDROM_LEADOUT ) {
493 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
494 *position = MSF_TO_FRAMES(
495 info.cdsc_absaddr.msf.minute,
496 info.cdsc_absaddr.msf.second,
497 info.cdsc_absaddr.msf.frame);
506 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
508 struct cdrom_msf playtime;
511 &playtime.cdmsf_min0, &playtime.cdmsf_sec0, &playtime.cdmsf_frame0);
512 FRAMES_TO_MSF(start+length,
513 &playtime.cdmsf_min1, &playtime.cdmsf_sec1, &playtime.cdmsf_frame1);
515 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
516 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
517 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
519 return(SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime));
523 static int SDL_SYS_CDPause(SDL_CD *cdrom)
525 return(SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0));
529 static int SDL_SYS_CDResume(SDL_CD *cdrom)
531 return(SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0));
535 static int SDL_SYS_CDStop(SDL_CD *cdrom)
537 return(SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0));
540 /* Eject the CD-ROM */
541 static int SDL_SYS_CDEject(SDL_CD *cdrom)
543 return(SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0));
546 /* Close the CD-ROM handle */
547 static void SDL_SYS_CDClose(SDL_CD *cdrom)
552 void SDL_SYS_CDQuit(void)
556 if ( SDL_numcds > 0 ) {
557 for ( i=0; i<SDL_numcds; ++i ) {
558 SDL_free(SDL_cdlist[i]);
564 #endif /* SDL_CDROM_LINUX */