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/* FreeJ
* (c) Copyright 2009 Andrea Guzzo <xant@dyne.org>
*
* This source code is free software; you can redistribute it and/or
* modify it under the terms of the GNU Public License as published
* by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
*
* This source code 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.
* Please refer to the GNU Public License for more details.
*
* You should have received a copy of the GNU Public License along with
* this source code; if not, write to:
* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#import <FrameRate.h>
// GOT From apple example : QTQuartzPlayer
#pragma mark FrameRate
@implementation FrameRate
-(id)initWithTimeScale:(int32_t)scale;
{
_count = 0;
_rate = 0;
_scale = scale;
return [super init];
}
-(void)dealloc
{
[super dealloc];
}
-(void)tick:(int64_t)timestamp;
{
int i = 0;
if (_count > NumStamps) {
for (i = 0; i < _count; i++) {
_stamps[i] = _stamps[i+1];
}
_count = NumStamps;
}
_stamps[_count++] = timestamp;
}
-(double)rate
{
if (_count > 1) { // kepp _rate updated
_rate = _scale/((_stamps[_count - 1] - _stamps[0])/_count);
}
return _rate;
}
@end
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