46 lines
1.3 KiB
Mathematica
46 lines
1.3 KiB
Mathematica
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/*
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* Copyright 2015 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#import "ARDBitrateTracker.h"
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#import <QuartzCore/QuartzCore.h>
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@implementation ARDBitrateTracker {
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CFTimeInterval _prevTime;
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NSInteger _prevByteCount;
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}
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@synthesize bitrate = _bitrate;
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+ (NSString *)bitrateStringForBitrate:(double)bitrate {
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if (bitrate > 1e6) {
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return [NSString stringWithFormat:@"%.2fMbps", bitrate * 1e-6];
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} else if (bitrate > 1e3) {
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return [NSString stringWithFormat:@"%.0fKbps", bitrate * 1e-3];
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} else {
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return [NSString stringWithFormat:@"%.0fbps", bitrate];
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}
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}
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- (NSString *)bitrateString {
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return [[self class] bitrateStringForBitrate:_bitrate];
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}
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- (void)updateBitrateWithCurrentByteCount:(NSInteger)byteCount {
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CFTimeInterval currentTime = CACurrentMediaTime();
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if (_prevTime && (byteCount > _prevByteCount)) {
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_bitrate = (byteCount - _prevByteCount) * 8 / (currentTime - _prevTime);
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}
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_prevByteCount = byteCount;
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_prevTime = currentTime;
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}
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@end
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