src/cdrom/os2/SDL_syscdrom.c - third_party/sdl - Git at Google

 /*
     SDL - Simple DirectMedia Layer
     Copyright (C) 1997-2009 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_OS2

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

 #define INCL_MCIOS2
 #include <os2.h>
 #include <os2me.h>

 #include "SDL_cdrom.h"
 #include "../SDL_syscdrom.h"

 /* Size of MCI result buffer (in bytes) */
 #define MCI_CMDRETBUFSIZE	128

 /* 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);

 /* MCI Timing Functions */
 #define	MCI_MMTIMEPERSECOND		3000
 #define	FRAMESFROMMM(mmtime)		(((mmtime)*CD_FPS)/MCI_MMTIMEPERSECOND)


 /* Ready for MCI CDAudio Devices */
 int  SDL_SYS_CDInit(void)
 {
 int i; /* generig counter */
 MCI_SYSINFO_PARMS		msp;	/* Structure to MCI SysInfo parameters */
 CHAR 						SysInfoRet[MCI_CMDRETBUFSIZE];	/* Buffer for MCI Command result */

 /* 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;

 /* Get the number of CD ROMs in the System */
 /* Clean SysInfo structure */
 SDL_memset(&msp, 0x00, sizeof(MCI_SYSINFO_PARMS));
 /* Prepare structure to Ask Numer of Audio CDs */
 msp.usDeviceType = MCI_DEVTYPE_CD_AUDIO;	/* CD Audio Type */
 msp.pszReturn = (PSZ)&SysInfoRet; 	/* Return Structure */
 msp.ulRetSize = MCI_CMDRETBUFSIZE; 	/* Size of ret struct */
 if (LOUSHORT(mciSendCommand(0,MCI_SYSINFO, MCI_SYSINFO_QUANTITY | MCI_WAIT, (PVOID)&msp, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
 SDL_numcds = atoi(SysInfoRet);
 if (SDL_numcds > MAX_DRIVES) SDL_numcds = MAX_DRIVES; /* Limit maximum CD number */

 /* Get and Add their system name to the SDL_cdlist */
 msp.pszReturn = (PSZ)&SysInfoRet; 				/* Return Structure */
 msp.ulRetSize = MCI_CMDRETBUFSIZE; 			/* Size of ret struct */
 msp.usDeviceType = MCI_DEVTYPE_CD_AUDIO;		/* CD Audio Type */
 for (i=0; i<SDL_numcds; i++)
 	{
 	msp.ulNumber = i+1;
 	mciSendCommand(0,MCI_SYSINFO, MCI_SYSINFO_NAME | MCI_WAIT,&msp, 0);
 	SDL_cdlist[i] = SDL_strdup(SysInfoRet);
 	if ( SDL_cdlist[i] == NULL )
 		{
 		SDL_OutOfMemory();
 		return(-1);
 		}
 	}
 return(0);
 }

 /* Return CDAudio System Dependent Device Name - Ready for MCI*/
 static const char *SDL_SYS_CDName(int drive)
 {
 return(SDL_cdlist[drive]);
 }

 /* Open CDAudio Device - Ready for MCI */
 static int SDL_SYS_CDOpen(int drive)
 {
 MCI_OPEN_PARMS	mop;
 MCI_SET_PARMS msp;
 MCI_GENERIC_PARMS mgp;

 /* Open the device */
 mop.hwndCallback = (HWND)NULL;		// None
 mop.usDeviceID = (USHORT)NULL;		// Will be returned.
 mop.pszDeviceType = (PSZ)SDL_cdlist[drive];		// CDAudio Device
 if (LOUSHORT(mciSendCommand(0,MCI_OPEN,MCI_WAIT,&mop, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
 /* Set time format */
 msp.hwndCallback = (HWND)NULL;		// None
 msp.ulTimeFormat = MCI_FORMAT_MSF;	// Minute : Second : Frame structure
 msp.ulSpeedFormat = (ULONG)NULL;		// No change
 msp.ulAudio = (ULONG)NULL;				// No Channel
 msp.ulLevel = (ULONG)NULL;				// No Volume
 msp.ulOver = (ULONG)NULL;				// No Delay
 msp.ulItem = (ULONG)NULL;				// No item
 msp.ulValue = (ULONG)NULL;				// No value for item flag
 if (LOUSHORT(mciSendCommand(mop.usDeviceID,MCI_SET,MCI_WAIT | MCI_SET_TIME_FORMAT,&msp, 0)) == MCIERR_SUCCESS) return (mop.usDeviceID);
 /* Error setting time format? - Close opened device */
 mgp.hwndCallback = (HWND)NULL;		// None
 mciSendCommand(mop.usDeviceID,MCI_CLOSE,MCI_WAIT,&mgp, 0);
 return(CD_ERROR);
 }

 /* Get CD Table Of Contents - Ready for MCI */
 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
 {
 MCI_TOC_PARMS mtp;
 MCI_STATUS_PARMS msp;
 MCI_TOC_REC * mtr;
 INT i;

 /* Correction because MCI cannot read TOC while CD is playing (it'll stop!) */
 if (cdrom->status == CD_PLAYING || cdrom->status == CD_PAUSED) return 0;

 /* Get Number of Tracks */
 msp.hwndCallback = (HWND)NULL; /* None */
 msp.ulReturn = (ULONG)NULL; /* We want this information */
 msp.ulItem = MCI_STATUS_NUMBER_OF_TRACKS;
 msp.ulValue = (ULONG)NULL; /* No additional information */
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
 cdrom->numtracks = msp.ulReturn;
 if ( cdrom->numtracks > SDL_MAX_TRACKS )
 	{
 	cdrom->numtracks = SDL_MAX_TRACKS;
 	}
 /* Alocate space for TOC data */
 mtr = (MCI_TOC_REC *)SDL_malloc(cdrom->numtracks*sizeof(MCI_TOC_REC));
 if ( mtr == NULL )
 	{
 	SDL_OutOfMemory();
 	return(-1);
 	}
 /* Get TOC from CD */
 mtp.pBuf = mtr;
 mtp.ulBufSize = cdrom->numtracks*sizeof(MCI_TOC_REC);
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_GETTOC,MCI_WAIT,&mtp, 0)) != MCIERR_SUCCESS)
 	{
 	SDL_OutOfMemory();
 	SDL_free(mtr);
 	return(CD_ERROR);
 	}
 /* Fill SDL Tracks Structure */
 for (i=0; i<cdrom->numtracks; i++)
 	{
 	/* Set Track ID */
 	cdrom->track[i].id = (mtr+i)->TrackNum;
 	/* Set Track Type */
 	msp.hwndCallback = (HWND)NULL; /* None */
 	msp.ulReturn = (ULONG)NULL; /* We want this information */
 	msp.ulItem = MCI_CD_STATUS_TRACK_TYPE;
 	msp.ulValue = (ULONG)((mtr+i)->TrackNum); /* Track Number? */
 	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_TRACK | MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS)
 		{
 		SDL_free(mtr);
 		return (CD_ERROR);
 		}
 	if (msp.ulReturn==MCI_CD_TRACK_AUDIO) cdrom->track[i].type = SDL_AUDIO_TRACK;
 	else cdrom->track[i].type = SDL_DATA_TRACK;
 	/* Set Track Length - values from MCI are in MMTIMEs - 3000 MMTIME = 1 second */
 	cdrom->track[i].length = FRAMESFROMMM((mtr+i)->ulEndAddr - (mtr+i)->ulStartAddr);
 	/* Set Track Offset */
 	cdrom->track[i].offset = FRAMESFROMMM((mtr+i)->ulStartAddr);
 	}
 SDL_free(mtr);
 return(0);
 }


 /* Get CD-ROM status - Ready for MCI */
 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
 {
 CDstatus status;
 MCI_STATUS_PARMS msp;

 /* Get Status from MCI */
 msp.hwndCallback = (HWND)NULL; /* None */
 msp.ulReturn = (ULONG)NULL; /* We want this information */
 msp.ulItem = MCI_STATUS_MODE;
 msp.ulValue = (ULONG)NULL; /* No additional information */
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) status = CD_ERROR;
 else
 	{
 	switch(msp.ulReturn)
 		{
 		case	MCI_MODE_NOT_READY:
 			status = CD_TRAYEMPTY;
 			break;
 		case	MCI_MODE_PAUSE:
 			status = CD_PAUSED;
 			break;
 		case	MCI_MODE_PLAY:
 			status = CD_PLAYING;
 			break;
 		case	MCI_MODE_STOP:
 			status = CD_STOPPED;
 			break;
 		/* These cases should not occour */
 		case	MCI_MODE_RECORD:
 		case	MCI_MODE_SEEK:
 		default:
 			status = CD_ERROR;
 			break;
 		}
 	}

 /* Determine position */
 if (position != NULL) /* The SDL $&$&%# CDROM call sends NULL pointer here! */
 	{
 		if ((status == CD_PLAYING) || (status == CD_PAUSED))
 		{
 		/* Get Position */
 		msp.hwndCallback = (HWND)NULL; /* None */
 		msp.ulReturn = (ULONG)NULL; /* We want this information */
 		msp.ulItem = MCI_STATUS_POSITION;
 		msp.ulValue = (ULONG)NULL; /* No additiona info */
 		if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) return (CD_ERROR);
 		/* Convert from MSF (format selected in the Open process) to Frames (format that will be returned) */
 		*position = MSF_TO_FRAMES(MSF_MINUTE(msp.ulReturn),MSF_SECOND(msp.ulReturn),MSF_FRAME(msp.ulReturn));
 		}
 	else *position = 0;
 	}
 return(status);
 }

 /* Start play - Ready for MCI */
 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
 {
 MCI_GENERIC_PARMS mgp;
 MCI_STATUS_PARMS msp;
 MCI_PLAY_PARMS	mpp;
 ULONG min,sec,frm;

 /* Start MSF */
 FRAMES_TO_MSF(start, &min, &sec, &frm);
 MSF_MINUTE(mpp.ulFrom) = min;
 MSF_SECOND(mpp.ulFrom) = sec;
 MSF_FRAME(mpp.ulFrom) = frm;
 /* End MSF */
 FRAMES_TO_MSF(start+length, &min, &sec, &frm);
 MSF_MINUTE(mpp.ulTo) = min;
 MSF_SECOND(mpp.ulTo) = sec;
 MSF_FRAME(mpp.ulTo) = frm;
 #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
 /* Verifies if it is paused first... and if it is, unpause before stopping it. */
 msp.hwndCallback = (HWND)NULL; /* None */
 msp.ulReturn = (ULONG)NULL; /* We want this information */
 msp.ulItem = MCI_STATUS_MODE;
 msp.ulValue = (ULONG)NULL; /* No additional information */
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,&msp, 0)) == MCIERR_SUCCESS)
 	{
 	if (msp.ulReturn == MCI_MODE_PAUSE)
 		{
 		mgp.hwndCallback = (HWND)NULL;		// None
 		mciSendCommand(cdrom->id,MCI_RESUME,0,&mgp, 0);
 		}
 	}
 /* Now play it. */
 mpp.hwndCallback = (HWND)NULL;		// We do not want the info. temp
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_PLAY,MCI_FROM | MCI_TO,&mpp, 0)) == MCIERR_SUCCESS) return 0;
 return (CD_ERROR);
 }

 /* Pause play - Ready for MCI */
 static int SDL_SYS_CDPause(SDL_CD *cdrom)
 {
 MCI_GENERIC_PARMS mgp;

 mgp.hwndCallback = (HWND)NULL;		// None
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_PAUSE,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
 return(CD_ERROR);
 }

 /* Resume play - Ready for MCI */
 static int SDL_SYS_CDResume(SDL_CD *cdrom)
 {
 MCI_GENERIC_PARMS mgp;

 mgp.hwndCallback = (HWND)NULL;		// None
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_RESUME,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
 return(CD_ERROR);
 }

 /* Stop play - Ready for MCI */
 static int SDL_SYS_CDStop(SDL_CD *cdrom)
 {
 MCI_GENERIC_PARMS mgp;
 MCI_STATUS_PARMS msp;

 /* Verifies if it is paused first... and if it is, unpause before stopping it. */
 msp.hwndCallback = (HWND)NULL; /* None */
 msp.ulReturn = (ULONG)NULL; /* We want this information */
 msp.ulItem = MCI_STATUS_MODE;
 msp.ulValue = (ULONG)NULL; /* No additional information */
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,&msp, 0)) == MCIERR_SUCCESS)
 	{
 	if (msp.ulReturn == MCI_MODE_PAUSE)
 		{
 		mgp.hwndCallback = (HWND)NULL;		// None
 		mciSendCommand(cdrom->id,MCI_RESUME,0,&mgp, 0);
 		}
 	}
 /* Now stops the media */
 mgp.hwndCallback = (HWND)NULL;		// None
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STOP,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
 return(CD_ERROR);
 }

 /* Eject the CD-ROM - Ready for MCI */
 static int SDL_SYS_CDEject(SDL_CD *cdrom)
 {
 MCI_SET_PARMS msp;

 msp.hwndCallback = (HWND)NULL;		// None
 msp.ulTimeFormat = (ULONG)NULL;		// No change
 msp.ulSpeedFormat = (ULONG)NULL;		// No change
 msp.ulAudio = (ULONG)NULL;				// No Channel
 msp.ulLevel = (ULONG)NULL;				// No Volume
 msp.ulOver = (ULONG)NULL;				// No Delay
 msp.ulItem = (ULONG)NULL;					// No item
 msp.ulValue = (ULONG)NULL;					// No value for item flag
 if (LOUSHORT(mciSendCommand(cdrom->id,MCI_SET,MCI_WAIT | MCI_SET_DOOR_OPEN,&msp, 0)) == MCIERR_SUCCESS) return 0;
 return(CD_ERROR);
 }

 /* Close the CD-ROM handle - Ready for MCI */
 static void SDL_SYS_CDClose(SDL_CD *cdrom)
 {
 MCI_GENERIC_PARMS mgp;

 mgp.hwndCallback = (HWND)NULL;		// None
 mciSendCommand(cdrom->id,MCI_CLOSE,MCI_WAIT,&mgp, 0);
 }

 /* Finalize CDROM Subsystem - Ready for MCI */
 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_OS2 */
	/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997-2009 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_OS2

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

	#define INCL_MCIOS2
	#include <os2.h>
	#include <os2me.h>

	#include "SDL_cdrom.h"
	#include "../SDL_syscdrom.h"

	/* Size of MCI result buffer (in bytes) */
	#define MCI_CMDRETBUFSIZE 128

	/* 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);

	/* MCI Timing Functions */
	#define MCI_MMTIMEPERSECOND 3000
	#define FRAMESFROMMM(mmtime) (((mmtime)*CD_FPS)/MCI_MMTIMEPERSECOND)


	/* Ready for MCI CDAudio Devices */
	int SDL_SYS_CDInit(void)
	{
	int i; /* generig counter */
	MCI_SYSINFO_PARMS msp; /* Structure to MCI SysInfo parameters */
	CHAR SysInfoRet[MCI_CMDRETBUFSIZE]; /* Buffer for MCI Command result */

	/* 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;

	/* Get the number of CD ROMs in the System */
	/* Clean SysInfo structure */
	SDL_memset(&msp, 0x00, sizeof(MCI_SYSINFO_PARMS));
	/* Prepare structure to Ask Numer of Audio CDs */
	msp.usDeviceType = MCI_DEVTYPE_CD_AUDIO; /* CD Audio Type */
	msp.pszReturn = (PSZ)&SysInfoRet; /* Return Structure */
	msp.ulRetSize = MCI_CMDRETBUFSIZE; /* Size of ret struct */
	if (LOUSHORT(mciSendCommand(0,MCI_SYSINFO, MCI_SYSINFO_QUANTITY \| MCI_WAIT, (PVOID)&msp, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
	SDL_numcds = atoi(SysInfoRet);
	if (SDL_numcds > MAX_DRIVES) SDL_numcds = MAX_DRIVES; /* Limit maximum CD number */

	/* Get and Add their system name to the SDL_cdlist */
	msp.pszReturn = (PSZ)&SysInfoRet; /* Return Structure */
	msp.ulRetSize = MCI_CMDRETBUFSIZE; /* Size of ret struct */
	msp.usDeviceType = MCI_DEVTYPE_CD_AUDIO; /* CD Audio Type */
	for (i=0; i<SDL_numcds; i++)
	{
	msp.ulNumber = i+1;
	mciSendCommand(0,MCI_SYSINFO, MCI_SYSINFO_NAME \| MCI_WAIT,&msp, 0);
	SDL_cdlist[i] = SDL_strdup(SysInfoRet);
	if ( SDL_cdlist[i] == NULL )
	{
	SDL_OutOfMemory();
	return(-1);
	}
	}
	return(0);
	}

	/* Return CDAudio System Dependent Device Name - Ready for MCI*/
	static const char *SDL_SYS_CDName(int drive)
	{
	return(SDL_cdlist[drive]);
	}

	/* Open CDAudio Device - Ready for MCI */
	static int SDL_SYS_CDOpen(int drive)
	{
	MCI_OPEN_PARMS mop;
	MCI_SET_PARMS msp;
	MCI_GENERIC_PARMS mgp;

	/* Open the device */
	mop.hwndCallback = (HWND)NULL; // None
	mop.usDeviceID = (USHORT)NULL; // Will be returned.
	mop.pszDeviceType = (PSZ)SDL_cdlist[drive]; // CDAudio Device
	if (LOUSHORT(mciSendCommand(0,MCI_OPEN,MCI_WAIT,&mop, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
	/* Set time format */
	msp.hwndCallback = (HWND)NULL; // None
	msp.ulTimeFormat = MCI_FORMAT_MSF; // Minute : Second : Frame structure
	msp.ulSpeedFormat = (ULONG)NULL; // No change
	msp.ulAudio = (ULONG)NULL; // No Channel
	msp.ulLevel = (ULONG)NULL; // No Volume
	msp.ulOver = (ULONG)NULL; // No Delay
	msp.ulItem = (ULONG)NULL; // No item
	msp.ulValue = (ULONG)NULL; // No value for item flag
	if (LOUSHORT(mciSendCommand(mop.usDeviceID,MCI_SET,MCI_WAIT \| MCI_SET_TIME_FORMAT,&msp, 0)) == MCIERR_SUCCESS) return (mop.usDeviceID);
	/* Error setting time format? - Close opened device */
	mgp.hwndCallback = (HWND)NULL; // None
	mciSendCommand(mop.usDeviceID,MCI_CLOSE,MCI_WAIT,&mgp, 0);
	return(CD_ERROR);
	}

	/* Get CD Table Of Contents - Ready for MCI */
	static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
	{
	MCI_TOC_PARMS mtp;
	MCI_STATUS_PARMS msp;
	MCI_TOC_REC * mtr;
	INT i;

	/* Correction because MCI cannot read TOC while CD is playing (it'll stop!) */
	if (cdrom->status == CD_PLAYING \|\| cdrom->status == CD_PAUSED) return 0;

	/* Get Number of Tracks */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_STATUS_NUMBER_OF_TRACKS;
	msp.ulValue = (ULONG)NULL; /* No additional information */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) return(CD_ERROR);
	cdrom->numtracks = msp.ulReturn;
	if ( cdrom->numtracks > SDL_MAX_TRACKS )
	{
	cdrom->numtracks = SDL_MAX_TRACKS;
	}
	/* Alocate space for TOC data */
	mtr = (MCI_TOC_REC )SDL_malloc(cdrom->numtrackssizeof(MCI_TOC_REC));
	if ( mtr == NULL )
	{
	SDL_OutOfMemory();
	return(-1);
	}
	/* Get TOC from CD */
	mtp.pBuf = mtr;
	mtp.ulBufSize = cdrom->numtracks*sizeof(MCI_TOC_REC);
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_GETTOC,MCI_WAIT,&mtp, 0)) != MCIERR_SUCCESS)
	{
	SDL_OutOfMemory();
	SDL_free(mtr);
	return(CD_ERROR);
	}
	/* Fill SDL Tracks Structure */
	for (i=0; i<cdrom->numtracks; i++)
	{
	/* Set Track ID */
	cdrom->track[i].id = (mtr+i)->TrackNum;
	/* Set Track Type */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_CD_STATUS_TRACK_TYPE;
	msp.ulValue = (ULONG)((mtr+i)->TrackNum); /* Track Number? */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_TRACK \| MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS)
	{
	SDL_free(mtr);
	return (CD_ERROR);
	}
	if (msp.ulReturn==MCI_CD_TRACK_AUDIO) cdrom->track[i].type = SDL_AUDIO_TRACK;
	else cdrom->track[i].type = SDL_DATA_TRACK;
	/* Set Track Length - values from MCI are in MMTIMEs - 3000 MMTIME = 1 second */
	cdrom->track[i].length = FRAMESFROMMM((mtr+i)->ulEndAddr - (mtr+i)->ulStartAddr);
	/* Set Track Offset */
	cdrom->track[i].offset = FRAMESFROMMM((mtr+i)->ulStartAddr);
	}
	SDL_free(mtr);
	return(0);
	}


	/* Get CD-ROM status - Ready for MCI */
	static CDstatus SDL_SYS_CDStatus(SDL_CD cdrom, int position)
	{
	CDstatus status;
	MCI_STATUS_PARMS msp;

	/* Get Status from MCI */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_STATUS_MODE;
	msp.ulValue = (ULONG)NULL; /* No additional information */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) status = CD_ERROR;
	else
	{
	switch(msp.ulReturn)
	{
	case MCI_MODE_NOT_READY:
	status = CD_TRAYEMPTY;
	break;
	case MCI_MODE_PAUSE:
	status = CD_PAUSED;
	break;
	case MCI_MODE_PLAY:
	status = CD_PLAYING;
	break;
	case MCI_MODE_STOP:
	status = CD_STOPPED;
	break;
	/* These cases should not occour */
	case MCI_MODE_RECORD:
	case MCI_MODE_SEEK:
	default:
	status = CD_ERROR;
	break;
	}
	}

	/* Determine position */
	if (position != NULL) /* The SDL $&$&%# CDROM call sends NULL pointer here! */
	{
	if ((status == CD_PLAYING) \|\| (status == CD_PAUSED))
	{
	/* Get Position */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_STATUS_POSITION;
	msp.ulValue = (ULONG)NULL; /* No additiona info */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_STATUS_ITEM,&msp, 0)) != MCIERR_SUCCESS) return (CD_ERROR);
	/* Convert from MSF (format selected in the Open process) to Frames (format that will be returned) */
	*position = MSF_TO_FRAMES(MSF_MINUTE(msp.ulReturn),MSF_SECOND(msp.ulReturn),MSF_FRAME(msp.ulReturn));
	}
	else *position = 0;
	}
	return(status);
	}

	/* Start play - Ready for MCI */
	static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
	{
	MCI_GENERIC_PARMS mgp;
	MCI_STATUS_PARMS msp;
	MCI_PLAY_PARMS mpp;
	ULONG min,sec,frm;

	/* Start MSF */
	FRAMES_TO_MSF(start, &min, &sec, &frm);
	MSF_MINUTE(mpp.ulFrom) = min;
	MSF_SECOND(mpp.ulFrom) = sec;
	MSF_FRAME(mpp.ulFrom) = frm;
	/* End MSF */
	FRAMES_TO_MSF(start+length, &min, &sec, &frm);
	MSF_MINUTE(mpp.ulTo) = min;
	MSF_SECOND(mpp.ulTo) = sec;
	MSF_FRAME(mpp.ulTo) = frm;
	#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
	/* Verifies if it is paused first... and if it is, unpause before stopping it. */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_STATUS_MODE;
	msp.ulValue = (ULONG)NULL; /* No additional information */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_STATUS_ITEM,&msp, 0)) == MCIERR_SUCCESS)
	{
	if (msp.ulReturn == MCI_MODE_PAUSE)
	{
	mgp.hwndCallback = (HWND)NULL; // None
	mciSendCommand(cdrom->id,MCI_RESUME,0,&mgp, 0);
	}
	}
	/* Now play it. */
	mpp.hwndCallback = (HWND)NULL; // We do not want the info. temp
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_PLAY,MCI_FROM \| MCI_TO,&mpp, 0)) == MCIERR_SUCCESS) return 0;
	return (CD_ERROR);
	}

	/* Pause play - Ready for MCI */
	static int SDL_SYS_CDPause(SDL_CD *cdrom)
	{
	MCI_GENERIC_PARMS mgp;

	mgp.hwndCallback = (HWND)NULL; // None
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_PAUSE,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
	return(CD_ERROR);
	}

	/* Resume play - Ready for MCI */
	static int SDL_SYS_CDResume(SDL_CD *cdrom)
	{
	MCI_GENERIC_PARMS mgp;

	mgp.hwndCallback = (HWND)NULL; // None
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_RESUME,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
	return(CD_ERROR);
	}

	/* Stop play - Ready for MCI */
	static int SDL_SYS_CDStop(SDL_CD *cdrom)
	{
	MCI_GENERIC_PARMS mgp;
	MCI_STATUS_PARMS msp;

	/* Verifies if it is paused first... and if it is, unpause before stopping it. */
	msp.hwndCallback = (HWND)NULL; /* None */
	msp.ulReturn = (ULONG)NULL; /* We want this information */
	msp.ulItem = MCI_STATUS_MODE;
	msp.ulValue = (ULONG)NULL; /* No additional information */
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STATUS,MCI_WAIT \| MCI_STATUS_ITEM,&msp, 0)) == MCIERR_SUCCESS)
	{
	if (msp.ulReturn == MCI_MODE_PAUSE)
	{
	mgp.hwndCallback = (HWND)NULL; // None
	mciSendCommand(cdrom->id,MCI_RESUME,0,&mgp, 0);
	}
	}
	/* Now stops the media */
	mgp.hwndCallback = (HWND)NULL; // None
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_STOP,MCI_WAIT,&mgp, 0)) == MCIERR_SUCCESS) return 0;
	return(CD_ERROR);
	}

	/* Eject the CD-ROM - Ready for MCI */
	static int SDL_SYS_CDEject(SDL_CD *cdrom)
	{
	MCI_SET_PARMS msp;

	msp.hwndCallback = (HWND)NULL; // None
	msp.ulTimeFormat = (ULONG)NULL; // No change
	msp.ulSpeedFormat = (ULONG)NULL; // No change
	msp.ulAudio = (ULONG)NULL; // No Channel
	msp.ulLevel = (ULONG)NULL; // No Volume
	msp.ulOver = (ULONG)NULL; // No Delay
	msp.ulItem = (ULONG)NULL; // No item
	msp.ulValue = (ULONG)NULL; // No value for item flag
	if (LOUSHORT(mciSendCommand(cdrom->id,MCI_SET,MCI_WAIT \| MCI_SET_DOOR_OPEN,&msp, 0)) == MCIERR_SUCCESS) return 0;
	return(CD_ERROR);
	}

	/* Close the CD-ROM handle - Ready for MCI */
	static void SDL_SYS_CDClose(SDL_CD *cdrom)
	{
	MCI_GENERIC_PARMS mgp;

	mgp.hwndCallback = (HWND)NULL; // None
	mciSendCommand(cdrom->id,MCI_CLOSE,MCI_WAIT,&mgp, 0);
	}

	/* Finalize CDROM Subsystem - Ready for MCI */
	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_OS2 */