src/cdrom/SDL_cdrom.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 06 May 2004 15:55:06 +0000
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child 1312 c9b51268668f
permissions -rw-r--r--
Date: Sat, 24 Apr 2004 15:13:32 +0300 From: "Mike Gorchak" Subject: SDL updates for the QNX6 1. Updated the README.QNX 2. Updated libtool scripts, which are shipped with SDL for QNX6 support. 3. Added some code to support the new QNX 6.3.0, which is in beta now. 4. Added code to detect the hw features, which driver supports. 5. Added hw alpha blits code. 6. Fixed bug when application switches to fullscreen more the 2 times. (afte\ r that window becames always stay on top). 7. Updated a bit README for the tests. 8. Added information about acceleration show in the testalpha.c test. 9. Added small fixes to the testoverlay2.c test. 10. Added alpha and cc+alpha blits benchmarks to the testvidinfo.c test.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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@libsdl.org
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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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/* This is the CD-audio control API for Simple DirectMedia Layer */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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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#if !defined(macintosh)
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#define CLIP_FRAMES	10	/* Some CD-ROMs won't go all the way */
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#endif
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static int SDL_cdinitted = 0;
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static SDL_CD *default_cdrom;
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/* The system level CD-ROM control functions */
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struct CDcaps SDL_CDcaps = {
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	NULL,					/* Name */
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	NULL,					/* Open */
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	NULL,					/* GetTOC */
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	NULL,					/* Status */
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	NULL,					/* Play */
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	NULL,					/* Pause */
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	NULL,					/* Resume */
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	NULL,					/* Stop */
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	NULL,					/* Eject */
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	NULL,					/* Close */
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};
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int SDL_numcds;
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int SDL_CDROMInit(void)
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{
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	int retval;
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	SDL_numcds = 0;
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	retval = SDL_SYS_CDInit();
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	if ( retval == 0 ) {
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		SDL_cdinitted = 1;
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	}
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	default_cdrom = NULL;
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	return(retval);
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}
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/* Check to see if the CD-ROM subsystem has been initialized */
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static int CheckInit(int check_cdrom, SDL_CD **cdrom)
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{
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	int okay;
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	okay = SDL_cdinitted;
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	if ( check_cdrom && (*cdrom == NULL) ) {
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		*cdrom = default_cdrom;
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		if ( *cdrom == NULL ) {
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			SDL_SetError("CD-ROM not opened");
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			okay = 0;
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		}
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	}
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	if ( ! SDL_cdinitted ) {
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		SDL_SetError("CD-ROM subsystem not initialized");
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	}
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	return(okay);
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}
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int SDL_CDNumDrives(void)
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{
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	if ( ! CheckInit(0, NULL) ) {
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		return(-1);
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	}
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	return(SDL_numcds);
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}
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const char *SDL_CDName(int drive)
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{
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	if ( ! CheckInit(0, NULL) ) {
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		return(NULL);
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	}
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	if ( drive >= SDL_numcds ) {
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		SDL_SetError("Invalid CD-ROM drive index");
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		return(NULL);
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	}
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	if ( SDL_CDcaps.Name ) {
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		return(SDL_CDcaps.Name(drive));
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	} else {
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		return("");
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	}
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}
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SDL_CD *SDL_CDOpen(int drive)
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{
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	struct SDL_CD *cdrom;
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	if ( ! CheckInit(0, NULL) ) {
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		return(NULL);
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	}
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	if ( drive >= SDL_numcds ) {
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		SDL_SetError("Invalid CD-ROM drive index");
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		return(NULL);
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	}
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	cdrom = (SDL_CD *)malloc(sizeof(*cdrom));
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	if ( cdrom == NULL ) {
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		SDL_OutOfMemory();
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		return(NULL);
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	}
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	memset(cdrom, 0, sizeof(*cdrom));
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	cdrom->id = SDL_CDcaps.Open(drive);
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	if ( cdrom->id < 0 ) {
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		free(cdrom);
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		return(NULL);
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	}
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	default_cdrom = cdrom;
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	return(cdrom);
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}
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CDstatus SDL_CDStatus(SDL_CD *cdrom)
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{
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	CDstatus status;
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	int i;
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	Uint32 position;
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	/* Check if the CD-ROM subsystem has been initialized */
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	if ( ! CheckInit(1, &cdrom) ) {
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		return(CD_ERROR);
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	}
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	/* Get the current status of the drive */
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	cdrom->numtracks = 0;
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	cdrom->cur_track = 0;
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	cdrom->cur_frame = 0;
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	status = SDL_CDcaps.Status(cdrom, &i);
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	position = (Uint32)i;
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	cdrom->status = status;
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	/* Get the table of contents, if there's a CD available */
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	if ( CD_INDRIVE(status) ) {
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		if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) {
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			status = CD_ERROR;
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		}
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		/* If the drive is playing, get current play position */
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		if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) {
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			for ( i=1; cdrom->track[i].offset <= position; ++i ) {
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				/* Keep looking */;
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			}
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#ifdef DEBUG_CDROM
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  fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n",
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				position, i-1, cdrom->track[i-1].offset);
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#endif
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			cdrom->cur_track = i-1;
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			position -= cdrom->track[cdrom->cur_track].offset;
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			cdrom->cur_frame = position;
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		}
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	}
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	return(status);
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}
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int SDL_CDPlayTracks(SDL_CD *cdrom,
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			int strack, int sframe, int ntracks, int nframes)
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{
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	int etrack, eframe;
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	int start, length;
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	/* Check if the CD-ROM subsystem has been initialized */
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	if ( ! CheckInit(1, &cdrom) ) {
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		return(CD_ERROR);
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	}
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	/* Determine the starting and ending tracks */
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	if ( (strack < 0) || (strack >= cdrom->numtracks) ) {
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		SDL_SetError("Invalid starting track");
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		return(CD_ERROR);
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	}
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	if ( ! ntracks && ! nframes ) {
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		etrack = cdrom->numtracks;
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		eframe = 0;
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	} else {
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		etrack = strack+ntracks;
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		if ( etrack == strack ) {
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			eframe = sframe + nframes;
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		} else {
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			eframe = nframes;
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		}
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	}
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	if ( etrack > cdrom->numtracks ) {
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		SDL_SetError("Invalid play length");
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		return(CD_ERROR);
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   213
	}
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	/* Skip data tracks and verify frame offsets */
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	while ( (strack <= etrack) &&
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			(cdrom->track[strack].type == SDL_DATA_TRACK) ) {
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		++strack;
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   219
	}
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	if ( sframe >= (int)cdrom->track[strack].length ) {
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		SDL_SetError("Invalid starting frame for track %d", strack);
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		return(CD_ERROR);
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   223
	}
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   224
	while ( (etrack > strack) &&
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			(cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) {
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		--etrack;
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   227
	}
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   228
	if ( eframe > (int)cdrom->track[etrack].length ) {
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   229
		SDL_SetError("Invalid ending frame for track %d", etrack);
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   230
		return(CD_ERROR);
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   231
	}
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   232
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   233
	/* Determine start frame and play length */
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   234
	start = (cdrom->track[strack].offset+sframe);
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   235
	length = (cdrom->track[etrack].offset+eframe)-start;
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   236
#ifdef CLIP_FRAMES
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   237
	/* I've never seen this necessary, but xmcd does it.. */
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   238
	length -= CLIP_FRAMES;	/* CLIP_FRAMES == 10 */
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   239
#endif
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   240
	if ( length < 0 ) {
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   241
		return(0);
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   242
	}
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   243
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   244
	/* Play! */
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   245
#ifdef DEBUG_CDROM
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   246
  fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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   247
#endif
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   248
	return(SDL_CDcaps.Play(cdrom, start, length));
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   249
}
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   250
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   251
int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length)
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   252
{
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   253
	/* Check if the CD-ROM subsystem has been initialized */
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   254
	if ( ! CheckInit(1, &cdrom) ) {
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   255
		return(CD_ERROR);
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   256
	}
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   257
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   258
	return(SDL_CDcaps.Play(cdrom, sframe, length));
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   259
}
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   260
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   261
int SDL_CDPause(SDL_CD *cdrom)
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   262
{
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   263
	CDstatus status;
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   264
	int retval;
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   265
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   266
	/* Check if the CD-ROM subsystem has been initialized */
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   267
	if ( ! CheckInit(1, &cdrom) ) {
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   268
		return(CD_ERROR);
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   269
	}
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   270
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   271
	status = SDL_CDcaps.Status(cdrom, NULL);
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diff changeset
   272
	switch (status) {
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   273
		case CD_PLAYING:
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   274
			retval = SDL_CDcaps.Pause(cdrom);
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   275
			break;
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diff changeset
   276
		default:
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diff changeset
   277
			retval = 0;
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diff changeset
   278
			break;
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diff changeset
   279
	}
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   280
	return(retval);
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diff changeset
   281
}
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diff changeset
   282
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diff changeset
   283
int SDL_CDResume(SDL_CD *cdrom)
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   284
{
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   285
	CDstatus status;
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diff changeset
   286
	int retval;
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diff changeset
   287
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diff changeset
   288
	/* Check if the CD-ROM subsystem has been initialized */
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diff changeset
   289
	if ( ! CheckInit(1, &cdrom) ) {
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diff changeset
   290
		return(CD_ERROR);
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diff changeset
   291
	}
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diff changeset
   292
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diff changeset
   293
	status = SDL_CDcaps.Status(cdrom, NULL);
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diff changeset
   294
	switch (status) {
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diff changeset
   295
		case CD_PAUSED:
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diff changeset
   296
			retval = SDL_CDcaps.Resume(cdrom);
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diff changeset
   297
		default:
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diff changeset
   298
			retval = 0;
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diff changeset
   299
			break;
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diff changeset
   300
	}
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diff changeset
   301
	return(retval);
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parents:
diff changeset
   302
}
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diff changeset
   303
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diff changeset
   304
int SDL_CDStop(SDL_CD *cdrom)
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diff changeset
   305
{
74212992fb08 Initial revision
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diff changeset
   306
	CDstatus status;
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diff changeset
   307
	int retval;
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diff changeset
   308
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diff changeset
   309
	/* Check if the CD-ROM subsystem has been initialized */
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diff changeset
   310
	if ( ! CheckInit(1, &cdrom) ) {
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diff changeset
   311
		return(CD_ERROR);
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diff changeset
   312
	}
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   313
74212992fb08 Initial revision
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diff changeset
   314
	status = SDL_CDcaps.Status(cdrom, NULL);
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parents:
diff changeset
   315
	switch (status) {
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diff changeset
   316
		case CD_PLAYING:
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parents:
diff changeset
   317
		case CD_PAUSED:
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			retval = SDL_CDcaps.Stop(cdrom);
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		default:
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			retval = 0;
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			break;
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	}
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	return(retval);
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}
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   325
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int SDL_CDEject(SDL_CD *cdrom)
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{
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	/* Check if the CD-ROM subsystem has been initialized */
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	if ( ! CheckInit(1, &cdrom) ) {
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		return(CD_ERROR);
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	}
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	return(SDL_CDcaps.Eject(cdrom));
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}
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   334
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void SDL_CDClose(SDL_CD *cdrom)
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{
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	/* Check if the CD-ROM subsystem has been initialized */
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	if ( ! CheckInit(1, &cdrom) ) {
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		return;
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	}
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	SDL_CDcaps.Close(cdrom);
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	free(cdrom);
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	default_cdrom = NULL;
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}
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   345
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void SDL_CDROMQuit(void)
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{
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	SDL_SYS_CDQuit();
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	SDL_cdinitted = 0;
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}