src/cdrom/win32/SDL_syscdrom.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* Functions for system-level CD-ROM audio control */
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#include <stdlib.h>
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#include <stdio.h>
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#include <windows.h>
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#include <mmsystem.h>
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#include "SDL_error.h"
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#include "SDL_cdrom.h"
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#include "SDL_syscdrom.h"
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/* This really broken?? */
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#define BROKEN_MCI_PAUSE	/* Pausing actually stops play -- Doh! */
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/* The maximum number of CD-ROM drives we'll detect (Don't change!) */
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#define MAX_DRIVES	26	
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/* A list of available CD-ROM drives */
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static char *SDL_cdlist[MAX_DRIVES];
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static MCIDEVICEID SDL_mciID[MAX_DRIVES];
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#ifdef BROKEN_MCI_PAUSE
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static int SDL_paused[MAX_DRIVES];
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#endif
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/* The system-dependent CD control functions */
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static const char *SDL_SYS_CDName(int drive);
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static int SDL_SYS_CDOpen(int drive);
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static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
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static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
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static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
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static int SDL_SYS_CDPause(SDL_CD *cdrom);
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static int SDL_SYS_CDResume(SDL_CD *cdrom);
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static int SDL_SYS_CDStop(SDL_CD *cdrom);
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static int SDL_SYS_CDEject(SDL_CD *cdrom);
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static void SDL_SYS_CDClose(SDL_CD *cdrom);
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/* Add a CD-ROM drive to our list of valid drives */
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static void AddDrive(char *drive)
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{
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	int i;
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	if ( SDL_numcds < MAX_DRIVES ) {
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		/* Add this drive to our list */
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		i = SDL_numcds;
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		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
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		if ( SDL_cdlist[i] == NULL ) {
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			SDL_OutOfMemory();
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			return;
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		}
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		strcpy(SDL_cdlist[i], drive);
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		++SDL_numcds;
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#ifdef CDROM_DEBUG
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  fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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#endif
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	}
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}
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int  SDL_SYS_CDInit(void)
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{
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	/* checklist: Drive 'A' - 'Z' */
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	int i;
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	char drive[4];
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	/* Fill in our driver capabilities */
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	SDL_CDcaps.Name = SDL_SYS_CDName;
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	SDL_CDcaps.Open = SDL_SYS_CDOpen;
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	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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	SDL_CDcaps.Status = SDL_SYS_CDStatus;
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	SDL_CDcaps.Play = SDL_SYS_CDPlay;
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	SDL_CDcaps.Pause = SDL_SYS_CDPause;
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	SDL_CDcaps.Resume = SDL_SYS_CDResume;
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	SDL_CDcaps.Stop = SDL_SYS_CDStop;
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	SDL_CDcaps.Eject = SDL_SYS_CDEject;
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	SDL_CDcaps.Close = SDL_SYS_CDClose;
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	/* Scan the system for CD-ROM drives */
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	for ( i='A'; i<='Z'; ++i ) {
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		sprintf(drive, "%c:\\", i);
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		if ( GetDriveType(drive) == DRIVE_CDROM ) {
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			AddDrive(drive);
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		}
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	}
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	memset(SDL_mciID, 0, sizeof(SDL_mciID));
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	return(0);
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}
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/* General ioctl() CD-ROM command function */
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static int SDL_SYS_CDioctl(int id, UINT msg, DWORD flags, void *arg)
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{
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	MCIERROR mci_error;
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	mci_error = mciSendCommand(SDL_mciID[id], msg, flags, (DWORD)arg);
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	if ( mci_error ) {
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		char error[256];
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		mciGetErrorString(mci_error, error, 256);
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		SDL_SetError("mciSendCommand() error: %s", error);
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	}
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	return(!mci_error ? 0 : -1);
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}
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static const char *SDL_SYS_CDName(int drive)
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{
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	return(SDL_cdlist[drive]);
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}
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static int SDL_SYS_CDOpen(int drive)
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{
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	MCI_OPEN_PARMS mci_open;
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	MCI_SET_PARMS mci_set;
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	char device[3];
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	DWORD flags;
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	/* Open the requested device */
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	mci_open.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;
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	device[0] = *SDL_cdlist[drive];
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	device[1] = ':';
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	device[2] = '\0';
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	mci_open.lpstrElementName = device;
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	flags =
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	  (MCI_OPEN_TYPE|MCI_OPEN_SHAREABLE|MCI_OPEN_TYPE_ID|MCI_OPEN_ELEMENT);
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	if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {
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		flags &= ~MCI_OPEN_SHAREABLE;
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		if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {
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			return(-1);
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		}
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	}
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	SDL_mciID[drive] = mci_open.wDeviceID;
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	/* Set the minute-second-frame time format */
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	mci_set.dwTimeFormat = MCI_FORMAT_MSF;
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	SDL_SYS_CDioctl(drive, MCI_SET, MCI_SET_TIME_FORMAT, &mci_set);
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#ifdef BROKEN_MCI_PAUSE
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	SDL_paused[drive] = 0;
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#endif
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	return(drive);
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}
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static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
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{
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	MCI_STATUS_PARMS mci_status;
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	int i, okay;
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	DWORD flags;
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	okay = 0;
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	mci_status.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;
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	flags = MCI_STATUS_ITEM | MCI_WAIT;
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	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {
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		cdrom->numtracks = mci_status.dwReturn;
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		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
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			cdrom->numtracks = SDL_MAX_TRACKS;
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		}
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		/* Read all the track TOC entries */
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		flags = MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT;
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		for ( i=0; i<cdrom->numtracks; ++i ) {
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			cdrom->track[i].id = i+1;
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			mci_status.dwTrack = cdrom->track[i].id;
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#ifdef MCI_CDA_STATUS_TYPE_TRACK
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			mci_status.dwItem = MCI_CDA_STATUS_TYPE_TRACK;
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			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
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							&mci_status) < 0 ) {
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				break;
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			}
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			if ( mci_status.dwReturn == MCI_CDA_TRACK_AUDIO ) {
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				cdrom->track[i].type = SDL_AUDIO_TRACK;
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			} else {
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				cdrom->track[i].type = SDL_DATA_TRACK;
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			}
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#else
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			cdrom->track[i].type = SDL_AUDIO_TRACK;
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#endif
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			mci_status.dwItem = MCI_STATUS_POSITION;
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			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
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							&mci_status) < 0 ) {
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				break;
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			}
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			cdrom->track[i].offset = MSF_TO_FRAMES(
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					MCI_MSF_MINUTE(mci_status.dwReturn),
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					MCI_MSF_SECOND(mci_status.dwReturn),
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					MCI_MSF_FRAME(mci_status.dwReturn));
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			cdrom->track[i].length = 0;
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			if ( i > 0 ) {
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				cdrom->track[i-1].length =
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   213
						cdrom->track[i].offset-
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						cdrom->track[i-1].offset;
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			}
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   216
		}
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   217
		if ( i == cdrom->numtracks ) {
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			flags &= ~MCI_TRACK;
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			mci_status.dwItem = MCI_STATUS_LENGTH;
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			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
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   221
							&mci_status) == 0 ) {
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   222
				cdrom->track[i].offset = MSF_TO_FRAMES(
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   223
					MCI_MSF_MINUTE(mci_status.dwReturn),
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   224
					MCI_MSF_SECOND(mci_status.dwReturn),
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   225
					MCI_MSF_FRAME(mci_status.dwReturn));
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   226
				cdrom->track[i].length = 0;
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   227
				cdrom->track[i-1].length =
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   228
						cdrom->track[i].offset-
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   229
						cdrom->track[i-1].offset;
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   230
				okay = 1;
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diff changeset
   231
			}
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   232
		}
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   233
	}
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   234
	return(okay ? 0 : -1);
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   235
}
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   236
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   237
/* Get CD-ROM status */
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   238
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
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   239
{
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   240
	CDstatus status;
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   241
	MCI_STATUS_PARMS mci_status;
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   242
	DWORD flags;
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   243
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   244
	flags = MCI_STATUS_ITEM | MCI_WAIT;
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   245
	mci_status.dwItem = MCI_STATUS_MODE;
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   246
	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) < 0 ) {
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   247
		status = CD_ERROR;
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diff changeset
   248
	} else {
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   249
		switch (mci_status.dwReturn) {
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   250
			case MCI_MODE_NOT_READY:
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diff changeset
   251
			case MCI_MODE_OPEN:
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   252
				status = CD_TRAYEMPTY;
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diff changeset
   253
				break;
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diff changeset
   254
			case MCI_MODE_STOP:
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   255
#ifdef BROKEN_MCI_PAUSE
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   256
				if ( SDL_paused[cdrom->id] ) {
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diff changeset
   257
					status = CD_PAUSED;
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diff changeset
   258
				} else {
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diff changeset
   259
					status = CD_STOPPED;
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diff changeset
   260
				}
74212992fb08 Initial revision
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diff changeset
   261
#else
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diff changeset
   262
				status = CD_STOPPED;
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diff changeset
   263
#endif /* BROKEN_MCI_PAUSE */
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diff changeset
   264
				break;
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diff changeset
   265
			case MCI_MODE_PLAY:
74212992fb08 Initial revision
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diff changeset
   266
				status = CD_PLAYING;
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diff changeset
   267
				break;
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diff changeset
   268
			case MCI_MODE_PAUSE:
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diff changeset
   269
				status = CD_PAUSED;
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diff changeset
   270
				break;
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diff changeset
   271
			default:
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diff changeset
   272
				status = CD_ERROR;
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diff changeset
   273
				break;
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diff changeset
   274
		}
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   275
	}
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   276
	if ( position ) {
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diff changeset
   277
		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
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diff changeset
   278
			mci_status.dwItem = MCI_STATUS_POSITION;
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   279
			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
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diff changeset
   280
							&mci_status) == 0 ) {
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diff changeset
   281
				*position = MSF_TO_FRAMES(
74212992fb08 Initial revision
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diff changeset
   282
					MCI_MSF_MINUTE(mci_status.dwReturn),
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diff changeset
   283
					MCI_MSF_SECOND(mci_status.dwReturn),
74212992fb08 Initial revision
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diff changeset
   284
					MCI_MSF_FRAME(mci_status.dwReturn));
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diff changeset
   285
			} else {
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diff changeset
   286
				*position = 0;
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diff changeset
   287
			}
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diff changeset
   288
		} else {
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diff changeset
   289
			*position = 0;
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diff changeset
   290
		}
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diff changeset
   291
	}
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   292
	return(status);
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diff changeset
   293
}
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diff changeset
   294
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diff changeset
   295
/* Start play */
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   296
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
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diff changeset
   297
{
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   298
	MCI_PLAY_PARMS mci_play;
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diff changeset
   299
	int m, s, f;
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diff changeset
   300
	DWORD flags;
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parents:
diff changeset
   301
74212992fb08 Initial revision
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diff changeset
   302
	flags = MCI_FROM | MCI_TO | MCI_NOTIFY;
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diff changeset
   303
	mci_play.dwCallback = 0;
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diff changeset
   304
	FRAMES_TO_MSF(start, &m, &s, &f);
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diff changeset
   305
	mci_play.dwFrom = MCI_MAKE_MSF(m, s, f);
74212992fb08 Initial revision
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parents:
diff changeset
   306
	FRAMES_TO_MSF(start+length, &m, &s, &f);
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	mci_play.dwTo = MCI_MAKE_MSF(m, s, f);
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	return(SDL_SYS_CDioctl(cdrom->id, MCI_PLAY, flags, &mci_play));
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}
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/* Pause play */
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static int SDL_SYS_CDPause(SDL_CD *cdrom)
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{
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#ifdef BROKEN_MCI_PAUSE
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	SDL_paused[cdrom->id] = 1;
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#endif
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	return(SDL_SYS_CDioctl(cdrom->id, MCI_PAUSE, MCI_WAIT, NULL));
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}
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/* Resume play */
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static int SDL_SYS_CDResume(SDL_CD *cdrom)
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{
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#ifdef BROKEN_MCI_PAUSE
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	MCI_STATUS_PARMS mci_status;
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	int okay;
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	int flags;
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	okay = 0;
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	/* Play from the current play position to end of CD */
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	flags = MCI_STATUS_ITEM | MCI_WAIT;
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	mci_status.dwItem = MCI_STATUS_POSITION;
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	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {
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		MCI_PLAY_PARMS mci_play;
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		flags = MCI_FROM | MCI_NOTIFY;
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		mci_play.dwCallback = 0;
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		mci_play.dwFrom = mci_status.dwReturn;
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		if (SDL_SYS_CDioctl(cdrom->id,MCI_PLAY,flags,&mci_play) == 0) {
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			okay = 1;
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			SDL_paused[cdrom->id] = 0;
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		}
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	}
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	return(okay ? 0 : -1);
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#else
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	return(SDL_SYS_CDioctl(cdrom->id, MCI_RESUME, MCI_WAIT, NULL));
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#endif /* BROKEN_MCI_PAUSE */
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}
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/* Stop play */
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static int SDL_SYS_CDStop(SDL_CD *cdrom)
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{
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	return(SDL_SYS_CDioctl(cdrom->id, MCI_STOP, MCI_WAIT, NULL));
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}
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/* Eject the CD-ROM */
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static int SDL_SYS_CDEject(SDL_CD *cdrom)
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{
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	return(SDL_SYS_CDioctl(cdrom->id, MCI_SET, MCI_SET_DOOR_OPEN, NULL));
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}
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/* Close the CD-ROM handle */
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static void SDL_SYS_CDClose(SDL_CD *cdrom)
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{
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	SDL_SYS_CDioctl(cdrom->id, MCI_CLOSE, MCI_WAIT, NULL);
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}
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void SDL_SYS_CDQuit(void)
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{
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	int i;
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	if ( SDL_numcds > 0 ) {
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		for ( i=0; i<SDL_numcds; ++i ) {
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			free(SDL_cdlist[i]);
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		}
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		SDL_numcds = 0;
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	}
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}