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50 lines
746 B
Objective-C
50 lines
746 B
Objective-C
//
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// FrameRate.m
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// freej
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//
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// Created by xant on 3/8/09.
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// Copyright 2009 dyne.org. All rights reserved.
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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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