/*

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

*/

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

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <unistd.h>

#include <sys/cdio.h>

#include "SDL_stdlib.h"

#include "SDL_string.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);

/* Some ioctl() errno values which occur when the tray is empty */

#define ERRNO_TRAYEMPTY(errno) \

((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))

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

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

{

int is_cd, cdfd;

struct ioc_read_subchannel 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 ) {

info.address_format = CD_MSF_FORMAT;

info.data_format = CD_CURRENT_POSITION;

info.data_len = 0;

info.data = NULL;

/* Under Linux, EIO occurs when a disk is not present.

This isn't 100% reliable, so we use the USE_MNTENT

code above instead.

*/

if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||

ERRNO_TRAYEMPTY(errno) ) {

is_cd = 1;

}

close(cdfd);

}

}

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 *)SDL_malloc(SDL_strlen(drive)+1);

if ( SDL_cdlist[i] == NULL ) {

SDL_OutOfMemory();

return;

}

SDL_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

}

}

int SDL_SYS_CDInit(void)

{

/* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c

/dev/matcd?c /dev/mcd?c /dev/scd?c */

static char *checklist[] = {

"cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",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;

cdpath = SDL_malloc(SDL_strlen(SDLcdrom)+1);

if ( cdpath != NULL ) {

SDL_strcpy(cdpath, SDLcdrom);

SDLcdrom = cdpath;

do {

delim = SDL_strchr(SDLcdrom, ':');

if ( delim ) {

*delim++ = '\0';

}

if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {

AddDrive(SDLcdrom, &stbuf);

}

if ( delim ) {

SDLcdrom = delim;

} else {

SDLcdrom = NULL;

}

} while ( SDLcdrom );

SDL_free(cdpath);

}

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

if ( SDL_numcds > 0 ) {

return(0);

}

}

/* Scan the system for CD-ROM drives */

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/%sc", &checklist[i][3]);

insert = SDL_strchr(drive, '?');

if ( insert != NULL ) {

*insert = j;

}

switch (CheckDrive(drive, &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]);

if ( CheckDrive(drive, &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_EXCL|O_NONBLOCK), 0));

}

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)

{

struct ioc_toc_header toc;

int i, okay;

struct ioc_read_toc_entry entry;

struct cd_toc_entry data;

okay = 0;

if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {

cdrom->numtracks = toc.ending_track-toc.starting_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; /* CDROM_LEADOUT */

} else {

cdrom->track[i].id = toc.starting_track+i;

}

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

entry.address_format = CD_MSF_FORMAT;

entry.data_len = sizeof(data);

entry.data = &data;

if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,

&entry) < 0 ) {

break;

} else {

cdrom->track[i].type = data.control;

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

data.addr.msf.minute,

data.addr.msf.second,

data.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 ioc_toc_header toc;

struct ioc_read_subchannel info;

struct cd_sub_channel_info data;

info.address_format = CD_MSF_FORMAT;

info.data_format = CD_CURRENT_POSITION;

info.track = 0;

info.data_len = sizeof(data);

info.data = &data;

if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {

if ( ERRNO_TRAYEMPTY(errno) ) {

status = CD_TRAYEMPTY;

} else {

status = CD_ERROR;

}

} else {

switch (data.header.audio_status) {

case CD_AS_AUDIO_INVALID:

case CD_AS_NO_STATUS:

/* Try to determine if there's a CD available */

if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)

status = CD_STOPPED;

else

status = CD_TRAYEMPTY;

break;

case CD_AS_PLAY_COMPLETED:

status = CD_STOPPED;

break;

case CD_AS_PLAY_IN_PROGRESS:

status = CD_PLAYING;

break;

case CD_AS_PLAY_PAUSED:

status = CD_PAUSED;

break;

default:

status = CD_ERROR;

break;

}

}

if ( position ) {

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

*position = MSF_TO_FRAMES(

data.what.position.absaddr.msf.minute,

data.what.position.absaddr.msf.second,

data.what.position.absaddr.msf.frame);

} else {

*position = 0;

}

}

return(status);

}

/* Start play */

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

{

struct ioc_play_msf playtime;

FRAMES_TO_MSF(start,

&playtime.start_m, &playtime.start_s, &playtime.start_f);

FRAMES_TO_MSF(start+length,

&playtime.end_m, &playtime.end_s, &playtime.end_f);

#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

ioctl(cdrom->id, CDIOCSTART, 0);

return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));

}

/* Pause play */

static int SDL_SYS_CDPause(SDL_CD *cdrom)

{

return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));

}

/* Resume play */

static int SDL_SYS_CDResume(SDL_CD *cdrom)

{

return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));

}

/* Stop play */

static int SDL_SYS_CDStop(SDL_CD *cdrom)

{

return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));

}

/* Eject the CD-ROM */

static int SDL_SYS_CDEject(SDL_CD *cdrom)

{

return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 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;

}

}