SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

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

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

Carsten Griwodz

griff@kom.tu-darmstadt.de

based on linux/SDL_syscdrom.c by Sam Lantinga

*/

/* Functions for system-level CD-ROM audio control */

#define DEBUG_CDROM 1

#include <sys/types.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <sys/devinfo.h>

#include <sys/mntctl.h>

#include <sys/statfs.h>

#include <sys/vmount.h>

#include <fstab.h>

#include <sys/scdisk.h>

#include "SDL_error.h"

#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);

static int SDL_SYS_CDioctl(int id, int command, void *arg);

/* Check a drive to see if it is a CD-ROM */

static int CheckDrive(char *drive, struct stat *stbuf)

{

int is_cd;

int cdfd;

int ret;

struct devinfo 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_EXCL|O_NONBLOCK), 0);

if ( cdfd >= 0 ) {

ret = SDL_SYS_CDioctl( cdfd, IOCINFO, &info );

if ( ret < 0 ) {

/* Some kind of error */

is_cd = 0;

} else {

if ( info.devtype == DD_CDROM ) {

is_cd = 1;

} else {

is_cd = 0;

}

}

close(cdfd);

}

#ifdef DEBUG_CDROM

else

{

fprintf(stderr, "Could not open drive %s (%s)\n", drive, strerror(errno));

}

#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] = (char *)malloc(strlen(drive)+1);

if ( SDL_cdlist[i] == NULL ) {

SDL_OutOfMemory();

return;

}

strcpy(SDL_cdlist[i], drive);

SDL_cdmode[i] = stbuf->st_rdev;

++SDL_numcds;

#ifdef DEBUG_CDROM

fprintf(stderr, "Added CD-ROM drive: %s\n", drive);

#endif

}

}

static void CheckMounts()

{

char* buffer;

int bufsz;

struct vmount* ptr;

int ret;

buffer = (char*)malloc(10);

bufsz = 10;

if ( buffer==NULL )

{

fprintf(stderr, "Could not allocate 10 bytes in aix/SDL_syscdrom.c:CheckMounts\n" );

exit ( -10 );

}

do

{

/* mntctrl() returns an array of all mounted filesystems */

ret = mntctl ( MCTL_QUERY, bufsz, buffer );

if ( ret == 0 )

{

/* Buffer was too small, realloc. */

bufsz = *(int*)buffer; /* Required size is in first word. */

/* (whatever a word is in AIX 4.3.3) */

/* int seems to be OK in 32bit mode. */

free(buffer);

buffer = (char*)malloc(bufsz);

if ( buffer==NULL )

{

fprintf(stderr,

"Could not allocate %d bytes in aix/SDL_syscdrom.c:CheckMounts\n",

bufsz );

exit ( -10 );

}

}

else if ( ret < 0 )

{

#ifdef DEBUG_CDROM

fprintf(stderr, "Error reading vmount structures\n");

#endif

return;

}

}

while ( ret == 0 );

#ifdef DEBUG_CDROM

fprintf ( stderr, "Read %d vmount structures\n",ret );

#endif

ptr = (struct vmount*)buffer;

do

{

switch(ptr->vmt_gfstype)

{

case MNT_CDROM :

{

struct stat stbuf;

char* text;

text = (char*)ptr + ptr->vmt_data[VMT_OBJECT].vmt_off;

#ifdef DEBUG_CDROM

fprintf(stderr, "Checking mount path: %s mounted on %s\n",

text, (char*)ptr + ptr->vmt_data[VMT_STUB].vmt_off );

#endif

if ( CheckDrive( text, &stbuf) > 0)

{

AddDrive( text, &stbuf);

}

}

break;

default :

break;

}

ptr = (struct vmount*)((char*)ptr + ptr->vmt_length);

ret--;

}

while ( ret > 0 );

free ( buffer );

}

static int CheckNonmounts()

{

#ifdef _THREAD_SAFE

AFILE_t fsFile = NULL;

int passNo = 0;

int ret;

struct fstab entry;

struct stat stbuf;

ret = setfsent_r( &fsFile, &passNo );

if ( ret != 0 ) return -1;

do

{

ret = getfsent_r ( &entry, &fsFile, &passNo );

if ( ret == 0 ) {

char* l = strrchr(entry.fs_spec,'/');

if ( l != NULL ) {

if ( !strncmp("cd",++l,2) ) {

#ifdef DEBUG_CDROM

fprintf(stderr,

"Found unmounted CD ROM drive with device name %s\n",

entry.fs_spec);

#endif

if ( CheckDrive( entry.fs_spec, &stbuf) > 0)

{

AddDrive( entry.fs_spec, &stbuf);

}

}

}

}

}

while ( ret == 0 );

ret = endfsent_r ( &fsFile );

if ( ret != 0 ) return -1;

return 0;

#else

struct fstab* entry;

struct stat stbuf;

setfsent();

do

{

entry = getfsent();

if ( entry != NULL ) {

char* l = strrchr(entry->fs_spec,'/');

if ( l != NULL ) {

if ( !strncmp("cd",++l,2) ) {

#ifdef DEBUG_CDROM

fprintf(stderr,"Found unmounted CD ROM drive with device name %s", entry->fs_spec);

#endif

if ( CheckDrive( entry->fs_spec, &stbuf) > 0)

{

AddDrive( entry->fs_spec, &stbuf);

}

}

}

}

}

while ( entry != NULL );

endfsent();

#endif

}

int SDL_SYS_CDInit(void)

{

char *SDLcdrom;

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 = getenv("SDL_CDROM"); /* ':' separated list of devices */

if ( SDLcdrom != NULL ) {

char *cdpath, *delim;

cdpath = malloc(strlen(SDLcdrom)+1);

if ( cdpath != NULL ) {

strcpy(cdpath, SDLcdrom);

SDLcdrom = cdpath;

do {

delim = 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, &stbuf) > 0 ) {

AddDrive(SDLcdrom, &stbuf);

}

if ( delim ) {

SDLcdrom = delim;

} else {

SDLcdrom = NULL;

}

} while ( SDLcdrom );

free(cdpath);

}

/* If we found our drives, there's nothing left to do */

if ( SDL_numcds > 0 ) {

return(0);

}

}

CheckMounts();

CheckNonmounts();

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)

{

int fd;

char* lastsl;

char* cdromname;

/*

* We found /dev/cd? drives and that is in our list. But we can

* open only the /dev/rcd? versions of those devices for Audio CD.

*/

cdromname = (char*)malloc( strlen(SDL_cdlist[drive]+2) );

strcpy(cdromname,SDL_cdlist[drive]);

lastsl = strrchr(cdromname,'/');

if (lastsl) {

*lastsl = 0;

strcat(cdromname,"/r");

lastsl = strrchr(SDL_cdlist[drive],'/');

if (lastsl) {

lastsl++;

strcat(cdromname,lastsl);

}

}

#ifdef DEBUG_CDROM

fprintf(stderr, "Should open drive %s, opening %s\n", SDL_cdlist[drive], cdromname);

#endif

/*

* Use exclusive access. Don't use SC_DIAGNOSTICS as xmcd does because they

* require root priviledges, and we don't want that. SC_SINGLE provides

* exclusive access with less trouble.

*/

fd = openx(cdromname, O_RDONLY, NULL, SC_SINGLE);

if ( fd < 0 )

{

#ifdef DEBUG_CDROM

fprintf(stderr, "Could not open drive %s (%s)\n", cdromname, strerror(errno));

#endif

}

else

{

struct mode_form_op cdMode;

int ret;

#ifdef DEBUG_CDROM

cdMode.action = CD_GET_MODE;

ret = SDL_SYS_CDioctl(fd, DK_CD_MODE, &cdMode);

if ( ret < 0 ) {

fprintf(stderr,

"Could not get drive mode for %s (%s)\n",

cdromname, strerror(errno));

} else {

switch(cdMode.cd_mode_form) {

case CD_MODE1 :

fprintf(stderr,

"Drive mode for %s is %s\n",

cdromname, "CD-ROM Data Mode 1");

break;

case CD_MODE2_FORM1 :

fprintf(stderr,

"Drive mode for %s is %s\n",

cdromname, "CD-ROM XA Data Mode 2 Form 1");

break;

case CD_MODE2_FORM2 :

fprintf(stderr,

"Drive mode for %s is %s\n",

cdromname, "CD-ROM XA Data Mode 2 Form 2");

break;

case CD_DA :

fprintf(stderr,

"Drive mode for %s is %s\n",

cdromname, "CD-DA");

break;

default :

fprintf(stderr,

"Drive mode for %s is %s\n",

cdromname, "unknown");

break;

}

}

#endif

cdMode.action = CD_CHG_MODE;

cdMode.cd_mode_form = CD_DA;

ret = SDL_SYS_CDioctl(fd, DK_CD_MODE, &cdMode);

if ( ret < 0 ) {

#ifdef DEBUG_CDROM

fprintf(stderr,

"Could not set drive mode for %s (%s)\n",

cdromname, strerror(errno));

#endif

SDL_SetError("ioctl() error: Could not set CD drive mode, %s",

strerror(errno));

} else {

#ifdef DEBUG_CDROM

fprintf(stderr,

"Drive mode for %s set to CD_DA\n",

cdromname);

#endif

}

}

free(cdromname);

return fd;

}

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)

{

struct cd_audio_cmd cmd;

struct cd_audio_cmd entry;

int i;

int okay;

cmd.audio_cmds = CD_TRK_INFO_AUDIO;

cmd.msf_flag = FALSE;

if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd) < 0 ) {

return -1;

}

okay = 0;

cdrom->numtracks = cmd.indexing.track_index.last_track

- cmd.indexing.track_index.first_track+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 = 0xAA;;

} else {

cdrom->track[i].id = cmd.indexing.track_index.first_track+i;

}

entry.audio_cmds = CD_GET_TRK_MSF;

entry.indexing.track_msf.track = cdrom->track[i].id;

if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &entry) < 0 ) {

break;

} else {

cdrom->track[i].type = 0; /* don't know how to detect 0x04 data track */

cdrom->track[i].offset = MSF_TO_FRAMES(

entry.indexing.track_msf.mins,

entry.indexing.track_msf.secs,

entry.indexing.track_msf.frames);

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 cd_audio_cmd cmd;

cmd.audio_cmds = CD_INFO_AUDIO;

if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd) < 0 ) {

#ifdef DEBUG_CDROM

fprintf(stderr, "ioctl failed in SDL_SYS_CDStatus (%s)\n", SDL_GetError());

#endif

status = CD_ERROR;

} else {

switch (cmd.status) {

case CD_NO_AUDIO:

case CD_COMPLETED:

status = CD_STOPPED;

break;

case CD_PLAY_AUDIO:

status = CD_PLAYING;

break;

case CD_PAUSE_AUDIO:

status = CD_PAUSED;

break;

case CD_NOT_VALID:

#ifdef DEBUG_CDROM

fprintf(stderr, "cdStatus failed with CD_NOT_VALID\n");

#endif

status = CD_ERROR;

break;

case CD_STATUS_ERROR:

#ifdef DEBUG_CDROM

fprintf(stderr, "cdStatus failed with CD_STATUS_ERROR\n");

#endif

status = CD_ERROR;

break;

default:

#ifdef DEBUG_CDROM

fprintf(stderr, "cdStatus failed with unknown error\n");

#endif

status = CD_ERROR;

break;

}

}

if ( position ) {

if ( status == CD_PLAYING || (status == CD_PAUSED) ) {

*position = MSF_TO_FRAMES( cmd.indexing.info_audio.current_mins,

cmd.indexing.info_audio.current_secs,

cmd.indexing.info_audio.current_frames);

} else {

*position = 0;

}

}

return status;

}

/* Start play */

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)

{

struct cd_audio_cmd cmd;

/*

* My CD Rom is muted by default. I think I read that this is new with

* AIX 4.3. SDL does not change the volume, so I need a kludge. Maybe

* its better to do this elsewhere?

*/

cmd.audio_cmds = CD_PLAY_AUDIO | CD_SET_VOLUME;

cmd.msf_flag = TRUE;

FRAMES_TO_MSF(start,

&cmd.indexing.msf.first_mins,

&cmd.indexing.msf.first_secs,

&cmd.indexing.msf.first_frames);

FRAMES_TO_MSF(start+length,

&cmd.indexing.msf.last_mins,

&cmd.indexing.msf.last_secs,

&cmd.indexing.msf.last_frames);

cmd.volume_type = CD_VOLUME_ALL;

cmd.all_channel_vol = 255; /* This is a uchar. What is a good value? No docu! */

cmd.out_port_0_sel = CD_AUDIO_CHNL_0;

cmd.out_port_1_sel = CD_AUDIO_CHNL_1;

cmd.out_port_2_sel = CD_AUDIO_CHNL_2;

cmd.out_port_3_sel = CD_AUDIO_CHNL_3;

#ifdef DEBUG_CDROM

fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",

cmd.indexing.msf.first_mins,

cmd.indexing.msf.first_secs,

cmd.indexing.msf.first_frames,

cmd.indexing.msf.last_mins,

cmd.indexing.msf.last_secs,

cmd.indexing.msf.last_frames);

#endif

return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));

}

/* Pause play */

static int SDL_SYS_CDPause(SDL_CD *cdrom)

{

struct cd_audio_cmd cmd;

cmd.audio_cmds = CD_PAUSE_AUDIO;

return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));

}

/* Resume play */

static int SDL_SYS_CDResume(SDL_CD *cdrom)

{

struct cd_audio_cmd cmd;

cmd.audio_cmds = CD_RESUME_AUDIO;

return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));

}

/* Stop play */

static int SDL_SYS_CDStop(SDL_CD *cdrom)

{

struct cd_audio_cmd cmd;

cmd.audio_cmds = CD_STOP_AUDIO;

return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));

}

/* Eject the CD-ROM */

static int SDL_SYS_CDEject(SDL_CD *cdrom)

{

return(SDL_SYS_CDioctl(cdrom->id, DKEJECT, 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 ) {

free(SDL_cdlist[i]);

}

SDL_numcds = 0;

}

}