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61 lines
1.4 KiB
Objective-C
61 lines
1.4 KiB
Objective-C
/* FreeJ
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* (c) Copyright 2009 Andrea Guzzo <xant@dyne.org>
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*
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* This source code is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Public License as published
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* by the Free Software Foundation; either version 3 of the License,
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* or (at your option) any later version.
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*
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* This source code 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.
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* Please refer to the GNU Public License for more details.
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*
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* You should have received a copy of the GNU Public License along with
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* this source code; if not, write to:
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* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#import <FrameRate.h>
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// GOT From apple example : QTQuartzPlayer
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#pragma mark FrameRate
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@implementation FrameRate
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-(id)init
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{
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_count = 0;
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rate = 0;
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_frequency = CVGetHostClockFrequency();
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return [super init];
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}
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-(void)dealloc
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{
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[super dealloc];
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}
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-(void)tick:(uint64_t)timestamp;
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{
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int i = 0;
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if (_count > NumStamps) {
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for (i = 0; i < _count; i++) {
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_stamps[i] = _stamps[i+1];
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}
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_count = NumStamps;
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}
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_stamps[_count++] = timestamp;
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}
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-(double)rate
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{
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if (_count > 1) {
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rate = 1000000000/((_stamps[_count - 1] - _stamps[0])/_count);
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}
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return rate;
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}
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@end
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