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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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