blob: 2535b280383862896da684baad7a6faaae1adf61 [file] [log] [blame]
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifdef SDL_CDROM_LINUX
/* Functions for system-level CD-ROM audio control */
#include <string.h> /* For strerror() */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#ifdef __LINUX__
#ifdef HAVE_LINUX_VERSION_H
/* linux 2.6.9 workaround */
#include <linux/version.h>
#if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,9)
#include <asm/types.h>
#define __le64 __u64
#define __le32 __u32
#define __le16 __u16
#define __be64 __u64
#define __be32 __u32
#define __be16 __u16
#endif /* linux 2.6.9 workaround */
#endif /* HAVE_LINUX_VERSION_H */
#include <linux/cdrom.h>
#endif
#ifdef __SVR4
#include <sys/cdio.h>
#endif
/* Define this to use the alternative getmntent() code */
#ifndef __SVR4
#define USE_MNTENT
#endif
#ifdef USE_MNTENT
#if defined(__USLC__)
#include <sys/mntent.h>
#else
#include <mntent.h>
#endif
#ifndef _PATH_MNTTAB
#ifdef MNTTAB
#define _PATH_MNTTAB MNTTAB
#else
#define _PATH_MNTTAB "/etc/fstab"
#endif
#endif /* !_PATH_MNTTAB */
#ifndef _PATH_MOUNTED
#define _PATH_MOUNTED "/etc/mtab"
#endif /* !_PATH_MOUNTED */
#ifndef MNTTYPE_CDROM
#define MNTTYPE_CDROM "iso9660"
#endif
#ifndef MNTTYPE_SUPER
#define MNTTYPE_SUPER "supermount"
#endif
#endif /* USE_MNTENT */
#include "SDL_cdrom.h"
#include "../SDL_syscdrom.h"
/* The maximum number of CD-ROM drives we'll detect */
#define MAX_DRIVES 16
/* A list of available CD-ROM drives */
static char *SDL_cdlist[MAX_DRIVES];
static dev_t SDL_cdmode[MAX_DRIVES];
/* The system-dependent CD control functions */
static const char *SDL_SYS_CDName(int drive);
static int SDL_SYS_CDOpen(int drive);
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
static int SDL_SYS_CDPause(SDL_CD *cdrom);
static int SDL_SYS_CDResume(SDL_CD *cdrom);
static int SDL_SYS_CDStop(SDL_CD *cdrom);
static int SDL_SYS_CDEject(SDL_CD *cdrom);
static void SDL_SYS_CDClose(SDL_CD *cdrom);
/* Some ioctl() errno values which occur when the tray is empty */
#ifndef ENOMEDIUM
#define ENOMEDIUM ENOENT
#endif
#define ERRNO_TRAYEMPTY(errno) \
((errno == EIO) || (errno == ENOENT) || \
(errno == EINVAL) || (errno == ENOMEDIUM))
/* Check a drive to see if it is a CD-ROM */
static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
{
int is_cd, cdfd;
struct cdrom_subchnl info;
/* If it doesn't exist, return -1 */
if ( stat(drive, stbuf) < 0 ) {
return(-1);
}
/* If it does exist, verify that it's an available CD-ROM */
is_cd = 0;
if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
cdfd = open(drive, (O_RDONLY|O_NONBLOCK), 0);
if ( cdfd >= 0 ) {
info.cdsc_format = CDROM_MSF;
/* Under Linux, EIO occurs when a disk is not present.
*/
if ( (ioctl(cdfd, CDROMSUBCHNL, &info) == 0) ||
ERRNO_TRAYEMPTY(errno) ) {
is_cd = 1;
}
close(cdfd);
}
#ifdef USE_MNTENT
/* Even if we can't read it, it might be mounted */
else if ( mnttype && (SDL_strcmp(mnttype, MNTTYPE_CDROM) == 0) ) {
is_cd = 1;
}
#endif
}
return(is_cd);
}
/* Add a CD-ROM drive to our list of valid drives */
static void AddDrive(char *drive, struct stat *stbuf)
{
int i;
if ( SDL_numcds < MAX_DRIVES ) {
/* Check to make sure it's not already in our list.
This can happen when we see a drive via symbolic link.
*/
for ( i=0; i<SDL_numcds; ++i ) {
if ( stbuf->st_rdev == SDL_cdmode[i] ) {
#ifdef DEBUG_CDROM
fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
#endif
return;
}
}
/* Add this drive to our list */
i = SDL_numcds;
SDL_cdlist[i] = SDL_strdup(drive);
if ( SDL_cdlist[i] == NULL ) {
SDL_OutOfMemory();
return;
}
SDL_cdmode[i] = stbuf->st_rdev;
++SDL_numcds;
#ifdef DEBUG_CDROM
fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
#endif
}
}
#ifdef USE_MNTENT
static void CheckMounts(const char *mtab)
{
FILE *mntfp;
struct mntent *mntent;
struct stat stbuf;
mntfp = setmntent(mtab, "r");
if ( mntfp != NULL ) {
char *tmp;
char *mnt_type;
size_t mnt_type_len;
char *mnt_dev;
size_t mnt_dev_len;
while ( (mntent=getmntent(mntfp)) != NULL ) {
mnt_type_len = SDL_strlen(mntent->mnt_type) + 1;
mnt_type = SDL_stack_alloc(char, mnt_type_len);
if (mnt_type == NULL)
continue; /* maybe you'll get lucky next time. */
mnt_dev_len = SDL_strlen(mntent->mnt_fsname) + 1;
mnt_dev = SDL_stack_alloc(char, mnt_dev_len);
if (mnt_dev == NULL) {
SDL_stack_free(mnt_type);
continue;
}
SDL_strlcpy(mnt_type, mntent->mnt_type, mnt_type_len);
SDL_strlcpy(mnt_dev, mntent->mnt_fsname, mnt_dev_len);
/* Handle "supermount" filesystem mounts */
if ( SDL_strcmp(mnt_type, MNTTYPE_SUPER) == 0 ) {
tmp = SDL_strstr(mntent->mnt_opts, "fs=");
if ( tmp ) {
SDL_stack_free(mnt_type);
mnt_type = SDL_strdup(tmp + SDL_strlen("fs="));
if ( mnt_type ) {
tmp = SDL_strchr(mnt_type, ',');
if ( tmp ) {
*tmp = '\0';
}
}
}
tmp = SDL_strstr(mntent->mnt_opts, "dev=");
if ( tmp ) {
SDL_stack_free(mnt_dev);
mnt_dev = SDL_strdup(tmp + SDL_strlen("dev="));
if ( mnt_dev ) {
tmp = SDL_strchr(mnt_dev, ',');
if ( tmp ) {
*tmp = '\0';
}
}
}
}
if ( SDL_strcmp(mnt_type, MNTTYPE_CDROM) == 0 ) {
#ifdef DEBUG_CDROM
fprintf(stderr, "Checking mount path from %s: %s mounted on %s of %s\n",
mtab, mnt_dev, mntent->mnt_dir, mnt_type);
#endif
if (CheckDrive(mnt_dev, mnt_type, &stbuf) > 0) {
AddDrive(mnt_dev, &stbuf);
}
}
SDL_stack_free(mnt_dev);
SDL_stack_free(mnt_type);
}
endmntent(mntfp);
}
}
#endif /* USE_MNTENT */
int SDL_SYS_CDInit(void)
{
/* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
static char *checklist[] = {
"cdrom", "?a hd?", "?0 scd?", "?0 sr?", NULL
};
char *SDLcdrom;
int i, j, exists;
char drive[32];
struct stat stbuf;
/* Fill in our driver capabilities */
SDL_CDcaps.Name = SDL_SYS_CDName;
SDL_CDcaps.Open = SDL_SYS_CDOpen;
SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
SDL_CDcaps.Status = SDL_SYS_CDStatus;
SDL_CDcaps.Play = SDL_SYS_CDPlay;
SDL_CDcaps.Pause = SDL_SYS_CDPause;
SDL_CDcaps.Resume = SDL_SYS_CDResume;
SDL_CDcaps.Stop = SDL_SYS_CDStop;
SDL_CDcaps.Eject = SDL_SYS_CDEject;
SDL_CDcaps.Close = SDL_SYS_CDClose;
/* Look in the environment for our CD-ROM drive list */
SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
if ( SDLcdrom != NULL ) {
char *cdpath, *delim;
size_t len = SDL_strlen(SDLcdrom)+1;
cdpath = SDL_stack_alloc(char, len);
if ( cdpath != NULL ) {
SDL_strlcpy(cdpath, SDLcdrom, len);
SDLcdrom = cdpath;
do {
delim = SDL_strchr(SDLcdrom, ':');
if ( delim ) {
*delim++ = '\0';
}
#ifdef DEBUG_CDROM
fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
#endif
if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
AddDrive(SDLcdrom, &stbuf);
}
if ( delim ) {
SDLcdrom = delim;
} else {
SDLcdrom = NULL;
}
} while ( SDLcdrom );
SDL_stack_free(cdpath);
}
/* If we found our drives, there's nothing left to do */
if ( SDL_numcds > 0 ) {
return(0);
}
}
#ifdef USE_MNTENT
/* Check /dev/cdrom first :-) */
if (CheckDrive("/dev/cdrom", NULL, &stbuf) > 0) {
AddDrive("/dev/cdrom", &stbuf);
}
/* Now check the currently mounted CD drives */
CheckMounts(_PATH_MOUNTED);
/* Finally check possible mountable drives in /etc/fstab */
CheckMounts(_PATH_MNTTAB);
/* If we found our drives, there's nothing left to do */
if ( SDL_numcds > 0 ) {
return(0);
}
#endif /* USE_MNTENT */
/* Scan the system for CD-ROM drives.
Not always 100% reliable, so use the USE_MNTENT code above first.
*/
for ( i=0; checklist[i]; ++i ) {
if ( checklist[i][0] == '?' ) {
char *insert;
exists = 1;
for ( j=checklist[i][1]; exists; ++j ) {
SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", &checklist[i][3]);
insert = SDL_strchr(drive, '?');
if ( insert != NULL ) {
*insert = j;
}
#ifdef DEBUG_CDROM
fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
#endif
switch (CheckDrive(drive, NULL, &stbuf)) {
/* Drive exists and is a CD-ROM */
case 1:
AddDrive(drive, &stbuf);
break;
/* Drive exists, but isn't a CD-ROM */
case 0:
break;
/* Drive doesn't exist */
case -1:
exists = 0;
break;
}
}
} else {
SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);
#ifdef DEBUG_CDROM
fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
#endif
if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
AddDrive(drive, &stbuf);
}
}
}
return(0);
}
/* General ioctl() CD-ROM command function */
static int SDL_SYS_CDioctl(int id, int command, void *arg)
{
int retval;
retval = ioctl(id, command, arg);
if ( retval < 0 ) {
SDL_SetError("ioctl() error: %s", strerror(errno));
}
return(retval);
}
static const char *SDL_SYS_CDName(int drive)
{
return(SDL_cdlist[drive]);
}
static int SDL_SYS_CDOpen(int drive)
{
return(open(SDL_cdlist[drive], (O_RDONLY|O_NONBLOCK), 0));
}
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
{
struct cdrom_tochdr toc;
int i, okay;
struct cdrom_tocentry entry;
okay = 0;
if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0 ) {
cdrom->numtracks = toc.cdth_trk1-toc.cdth_trk0+1;
if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
cdrom->numtracks = SDL_MAX_TRACKS;
}
/* Read all the track TOC entries */
for ( i=0; i<=cdrom->numtracks; ++i ) {
if ( i == cdrom->numtracks ) {
cdrom->track[i].id = CDROM_LEADOUT;
} else {
cdrom->track[i].id = toc.cdth_trk0+i;
}
entry.cdte_track = cdrom->track[i].id;
entry.cdte_format = CDROM_MSF;
if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY,
&entry) < 0 ) {
break;
} else {
if ( entry.cdte_ctrl & CDROM_DATA_TRACK ) {
cdrom->track[i].type = SDL_DATA_TRACK;
} else {
cdrom->track[i].type = SDL_AUDIO_TRACK;
}
cdrom->track[i].offset = MSF_TO_FRAMES(
entry.cdte_addr.msf.minute,
entry.cdte_addr.msf.second,
entry.cdte_addr.msf.frame);
cdrom->track[i].length = 0;
if ( i > 0 ) {
cdrom->track[i-1].length =
cdrom->track[i].offset-
cdrom->track[i-1].offset;
}
}
}
if ( i == (cdrom->numtracks+1) ) {
okay = 1;
}
}
return(okay ? 0 : -1);
}
/* Get CD-ROM status */
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
{
CDstatus status;
struct cdrom_tochdr toc;
struct cdrom_subchnl info;
info.cdsc_format = CDROM_MSF;
if ( ioctl(cdrom->id, CDROMSUBCHNL, &info) < 0 ) {
if ( ERRNO_TRAYEMPTY(errno) ) {
status = CD_TRAYEMPTY;
} else {
status = CD_ERROR;
}
} else {
switch (info.cdsc_audiostatus) {
case CDROM_AUDIO_INVALID:
case CDROM_AUDIO_NO_STATUS:
/* Try to determine if there's a CD available */
if (ioctl(cdrom->id, CDROMREADTOCHDR, &toc)==0)
status = CD_STOPPED;
else
status = CD_TRAYEMPTY;
break;
case CDROM_AUDIO_COMPLETED:
status = CD_STOPPED;
break;
case CDROM_AUDIO_PLAY:
status = CD_PLAYING;
break;
case CDROM_AUDIO_PAUSED:
/* Workaround buggy CD-ROM drive */
if ( info.cdsc_trk == CDROM_LEADOUT ) {
status = CD_STOPPED;
} else {
status = CD_PAUSED;
}
break;
default:
status = CD_ERROR;
break;
}
}
if ( position ) {
if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
*position = MSF_TO_FRAMES(
info.cdsc_absaddr.msf.minute,
info.cdsc_absaddr.msf.second,
info.cdsc_absaddr.msf.frame);
} else {
*position = 0;
}
}
return(status);
}
/* Start play */
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
{
struct cdrom_msf playtime;
FRAMES_TO_MSF(start,
&playtime.cdmsf_min0, &playtime.cdmsf_sec0, &playtime.cdmsf_frame0);
FRAMES_TO_MSF(start+length,
&playtime.cdmsf_min1, &playtime.cdmsf_sec1, &playtime.cdmsf_frame1);
#ifdef DEBUG_CDROM
fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
#endif
return(SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime));
}
/* Pause play */
static int SDL_SYS_CDPause(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0));
}
/* Resume play */
static int SDL_SYS_CDResume(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0));
}
/* Stop play */
static int SDL_SYS_CDStop(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0));
}
/* Eject the CD-ROM */
static int SDL_SYS_CDEject(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0));
}
/* Close the CD-ROM handle */
static void SDL_SYS_CDClose(SDL_CD *cdrom)
{
close(cdrom->id);
}
void SDL_SYS_CDQuit(void)
{
int i;
if ( SDL_numcds > 0 ) {
for ( i=0; i<SDL_numcds; ++i ) {
SDL_free(SDL_cdlist[i]);
}
SDL_numcds = 0;
}
}
#endif /* SDL_CDROM_LINUX */