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