src/cdrom/SDL_cdrom.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 06 May 2004 15:55:06 +0000
changeset 886 05c551e5bc64
parent 769 b8d311d90021
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.

/*
    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
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* This is the CD-audio control API for Simple DirectMedia Layer */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_cdrom.h"
#include "SDL_syscdrom.h"

#if !defined(macintosh)
#define CLIP_FRAMES	10	/* Some CD-ROMs won't go all the way */
#endif

static int SDL_cdinitted = 0;
static SDL_CD *default_cdrom;

/* The system level CD-ROM control functions */
struct CDcaps SDL_CDcaps = {
	NULL,					/* Name */
	NULL,					/* Open */
	NULL,					/* GetTOC */
	NULL,					/* Status */
	NULL,					/* Play */
	NULL,					/* Pause */
	NULL,					/* Resume */
	NULL,					/* Stop */
	NULL,					/* Eject */
	NULL,					/* Close */
};
int SDL_numcds;

int SDL_CDROMInit(void)
{
	int retval;

	SDL_numcds = 0;
	retval = SDL_SYS_CDInit();
	if ( retval == 0 ) {
		SDL_cdinitted = 1;
	}
	default_cdrom = NULL;
	return(retval);
}

/* Check to see if the CD-ROM subsystem has been initialized */
static int CheckInit(int check_cdrom, SDL_CD **cdrom)
{
	int okay;

	okay = SDL_cdinitted;
	if ( check_cdrom && (*cdrom == NULL) ) {
		*cdrom = default_cdrom;
		if ( *cdrom == NULL ) {
			SDL_SetError("CD-ROM not opened");
			okay = 0;
		}
	}
	if ( ! SDL_cdinitted ) {
		SDL_SetError("CD-ROM subsystem not initialized");
	}
	return(okay);
}

int SDL_CDNumDrives(void)
{
	if ( ! CheckInit(0, NULL) ) {
		return(-1);
	}
	return(SDL_numcds);
}

const char *SDL_CDName(int drive)
{
	if ( ! CheckInit(0, NULL) ) {
		return(NULL);
	}
	if ( drive >= SDL_numcds ) {
		SDL_SetError("Invalid CD-ROM drive index");
		return(NULL);
	}
	if ( SDL_CDcaps.Name ) {
		return(SDL_CDcaps.Name(drive));
	} else {
		return("");
	}
}

SDL_CD *SDL_CDOpen(int drive)
{
	struct SDL_CD *cdrom;

	if ( ! CheckInit(0, NULL) ) {
		return(NULL);
	}
	if ( drive >= SDL_numcds ) {
		SDL_SetError("Invalid CD-ROM drive index");
		return(NULL);
	}
	cdrom = (SDL_CD *)malloc(sizeof(*cdrom));
	if ( cdrom == NULL ) {
		SDL_OutOfMemory();
		return(NULL);
	}
	memset(cdrom, 0, sizeof(*cdrom));
	cdrom->id = SDL_CDcaps.Open(drive);
	if ( cdrom->id < 0 ) {
		free(cdrom);
		return(NULL);
	}
	default_cdrom = cdrom;
	return(cdrom);
}

CDstatus SDL_CDStatus(SDL_CD *cdrom)
{
	CDstatus status;
	int i;
	Uint32 position;

	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	/* Get the current status of the drive */
	cdrom->numtracks = 0;
	cdrom->cur_track = 0;
	cdrom->cur_frame = 0;
	status = SDL_CDcaps.Status(cdrom, &i);
	position = (Uint32)i;
	cdrom->status = status;

	/* Get the table of contents, if there's a CD available */
	if ( CD_INDRIVE(status) ) {
		if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) {
			status = CD_ERROR;
		}
		/* If the drive is playing, get current play position */
		if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) {
			for ( i=1; cdrom->track[i].offset <= position; ++i ) {
				/* Keep looking */;
			}
#ifdef DEBUG_CDROM
  fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n",
				position, i-1, cdrom->track[i-1].offset);
#endif
			cdrom->cur_track = i-1;
			position -= cdrom->track[cdrom->cur_track].offset;
			cdrom->cur_frame = position;
		}
	}
	return(status);
}

int SDL_CDPlayTracks(SDL_CD *cdrom,
			int strack, int sframe, int ntracks, int nframes)
{
	int etrack, eframe;
	int start, length;

	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	/* Determine the starting and ending tracks */
	if ( (strack < 0) || (strack >= cdrom->numtracks) ) {
		SDL_SetError("Invalid starting track");
		return(CD_ERROR);
	}
	if ( ! ntracks && ! nframes ) {
		etrack = cdrom->numtracks;
		eframe = 0;
	} else {
		etrack = strack+ntracks;
		if ( etrack == strack ) {
			eframe = sframe + nframes;
		} else {
			eframe = nframes;
		}
	}
	if ( etrack > cdrom->numtracks ) {
		SDL_SetError("Invalid play length");
		return(CD_ERROR);
	}

	/* Skip data tracks and verify frame offsets */
	while ( (strack <= etrack) &&
			(cdrom->track[strack].type == SDL_DATA_TRACK) ) {
		++strack;
	}
	if ( sframe >= (int)cdrom->track[strack].length ) {
		SDL_SetError("Invalid starting frame for track %d", strack);
		return(CD_ERROR);
	}
	while ( (etrack > strack) &&
			(cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) {
		--etrack;
	}
	if ( eframe > (int)cdrom->track[etrack].length ) {
		SDL_SetError("Invalid ending frame for track %d", etrack);
		return(CD_ERROR);
	}

	/* Determine start frame and play length */
	start = (cdrom->track[strack].offset+sframe);
	length = (cdrom->track[etrack].offset+eframe)-start;
#ifdef CLIP_FRAMES
	/* I've never seen this necessary, but xmcd does it.. */
	length -= CLIP_FRAMES;	/* CLIP_FRAMES == 10 */
#endif
	if ( length < 0 ) {
		return(0);
	}

	/* Play! */
#ifdef DEBUG_CDROM
  fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
#endif
	return(SDL_CDcaps.Play(cdrom, start, length));
}

int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length)
{
	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	return(SDL_CDcaps.Play(cdrom, sframe, length));
}

int SDL_CDPause(SDL_CD *cdrom)
{
	CDstatus status;
	int retval;

	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	status = SDL_CDcaps.Status(cdrom, NULL);
	switch (status) {
		case CD_PLAYING:
			retval = SDL_CDcaps.Pause(cdrom);
			break;
		default:
			retval = 0;
			break;
	}
	return(retval);
}

int SDL_CDResume(SDL_CD *cdrom)
{
	CDstatus status;
	int retval;

	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	status = SDL_CDcaps.Status(cdrom, NULL);
	switch (status) {
		case CD_PAUSED:
			retval = SDL_CDcaps.Resume(cdrom);
		default:
			retval = 0;
			break;
	}
	return(retval);
}

int SDL_CDStop(SDL_CD *cdrom)
{
	CDstatus status;
	int retval;

	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}

	status = SDL_CDcaps.Status(cdrom, NULL);
	switch (status) {
		case CD_PLAYING:
		case CD_PAUSED:
			retval = SDL_CDcaps.Stop(cdrom);
		default:
			retval = 0;
			break;
	}
	return(retval);
}

int SDL_CDEject(SDL_CD *cdrom)
{
	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return(CD_ERROR);
	}
	return(SDL_CDcaps.Eject(cdrom));
}

void SDL_CDClose(SDL_CD *cdrom)
{
	/* Check if the CD-ROM subsystem has been initialized */
	if ( ! CheckInit(1, &cdrom) ) {
		return;
	}
	SDL_CDcaps.Close(cdrom);
	free(cdrom);
	default_cdrom = NULL;
}

void SDL_CDROMQuit(void)
{
	SDL_SYS_CDQuit();
	SDL_cdinitted = 0;
}