/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2004 Sam Lantinga

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

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 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

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public

    License along with this library; if not, write to the Free

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#ifdef SDL_CDROM_MINT

/*

	Atari MetaDOS CD-ROM functions

	Patrice Mandin

*/

#include <errno.h>

#include <cdromio.h>

#include <metados.h>

#include "SDL_cdrom.h"

#include "../SDL_syscdrom.h"

/* 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))

/* The maximum number of CD-ROM drives we'll detect */

#define MAX_DRIVES	32	

typedef struct {

	unsigned char device[3];	/* Physical device letter + ':' + '\0' */

	metaopen_t	metaopen;		/* Infos on opened drive */

} metados_drive_t;

static metados_drive_t metados_drives[MAX_DRIVES];

/* The system-dependent CD control functions */

static const char *SDL_SYS_CDName(int drive);

static int SDL_SYS_CDOpen(int drive);

static void SDL_SYS_CDClose(SDL_CD *cdrom);

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

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);

int SDL_SYS_CDInit(void)

{

	metainit_t	metainit={0,0,0,0};

	metaopen_t	metaopen;

	int i, handle;

	struct cdrom_subchnl info;

	Metainit(&metainit);

	if (metainit.version == NULL) {

#ifdef DEBUG_CDROM

		fprintf(stderr, "MetaDOS not installed\n");

#endif

		return -1;

	}

	if (metainit.drives_map == 0) {

#ifdef DEBUG_CDROM

		fprintf(stderr, "No MetaDOS devices present\n");

#endif

		return -1;

	}

	SDL_numcds = 0;

	for (i='A'; i<='Z'; i++) {

		metados_drives[SDL_numcds].device[0] = 0;

		metados_drives[SDL_numcds].device[1] = ':';

		metados_drives[SDL_numcds].device[2] = 0;

		if (metainit.drives_map & (1<<(i-'A'))) {

			handle = Metaopen(i, &metaopen);

			if (handle == 0) {

				info.cdsc_format = CDROM_MSF;

				if ( (Metaioctl(i, METADOS_IOCTL_MAGIC, CDROMSUBCHNL, &info) == 0) || ERRNO_TRAYEMPTY(errno) ) {

					metados_drives[SDL_numcds].device[0] = i;

					++SDL_numcds;

				}

				Metaclose(i);

			}

		}

	}

	/* Fill in our driver capabilities */

	SDL_CDcaps.Name = SDL_SYS_CDName;

	SDL_CDcaps.Open = SDL_SYS_CDOpen;

	SDL_CDcaps.Close = SDL_SYS_CDClose;

	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;

	return 0;

}

void SDL_SYS_CDQuit(void)

{

	SDL_numcds = 0;

}

static const char *SDL_SYS_CDName(int drive)

{

	return(metados_drives[drive].device);

}

static int SDL_SYS_CDOpen(int drive)

{

	int handle;

	handle = Metaopen(metados_drives[drive].device[0], &(metados_drives[drive].metaopen));

	if (handle == 0) {

		return drive;

	}

	return -1;

}

static void SDL_SYS_CDClose(SDL_CD *cdrom)

{

	Metaclose(metados_drives[cdrom->id].device[0]);

}

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

{

	int retval;

	retval = Metaioctl(metados_drives[id].device[0], METADOS_IOCTL_MAGIC, command, arg);

	if ( retval < 0 ) {

		SDL_SetError("ioctl() error: %s", strerror(errno));

	}

	return(retval);

}

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)

{

	int i,okay;

	struct cdrom_tochdr toc;

	struct cdrom_tocentry entry;

	/* Use standard ioctl() */	

	if (SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc)<0) {

		return -1;

	}

	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 */

	okay=1;

	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 ) {

			okay=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;

			}

		}

	}

	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 ( SDL_SYS_CDioctl(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 (SDL_SYS_CDioctl(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);

}

#endif /* SDL_CDROM_MINT */