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| 1 /* | |
| 2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #import "ARDBitrateTracker.h" | |
| 12 | |
| 13 #import <QuartzCore/QuartzCore.h> | |
| 14 | |
| 15 @implementation ARDBitrateTracker { | |
| 16 CFTimeInterval _prevTime; | |
| 17 NSInteger _prevByteCount; | |
| 18 } | |
| 19 | |
| 20 @synthesize bitrate = _bitrate; | |
| 21 | |
| 22 + (NSString *)bitrateStringForBitrate:(double)bitrate { | |
| 23 if (bitrate > 1e6) { | |
| 24 return [NSString stringWithFormat:@"%.2fMbps", bitrate * 1e-6]; | |
| 25 } else if (bitrate > 1e3) { | |
| 26 return [NSString stringWithFormat:@"%.0fKbps", bitrate * 1e-3]; | |
| 27 } else { | |
| 28 return [NSString stringWithFormat:@"%.0fbps", bitrate]; | |
| 29 } | |
| 30 } | |
| 31 | |
| 32 - (NSString *)bitrateString { | |
| 33 return [[self class] bitrateStringForBitrate:_bitrate]; | |
| 34 } | |
| 35 | |
| 36 - (void)updateBitrateWithCurrentByteCount:(NSInteger)byteCount { | |
| 37 CFTimeInterval currentTime = CACurrentMediaTime(); | |
| 38 if (_prevTime && (byteCount > _prevByteCount)) { | |
| 39 _bitrate = (byteCount - _prevByteCount) * 8 / (currentTime - _prevTime); | |
| 40 } | |
| 41 _prevByteCount = byteCount; | |
| 42 _prevTime = currentTime; | |
| 43 } | |
| 44 | |
| 45 @end | |
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