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/*
* Copyright (c) 2011 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.
*/
#ifndef WEBRTC_MODULES_VIDEO_CODING_RTT_FILTER_H_
#define WEBRTC_MODULES_VIDEO_CODING_RTT_FILTER_H_
#include "webrtc/typedefs.h"
namespace webrtc {
class VCMRttFilter {
public:
VCMRttFilter();
VCMRttFilter& operator=(const VCMRttFilter& rhs);
// Resets the filter.
void Reset();
// Updates the filter with a new sample.
void Update(int64_t rttMs);
// A getter function for the current RTT level in ms.
int64_t RttMs() const;
private:
// The size of the drift and jump memory buffers
// and thus also the detection threshold for these
// detectors in number of samples.
enum { kMaxDriftJumpCount = 5 };
// Detects RTT jumps by comparing the difference between
// samples and average to the standard deviation.
// Returns true if the long time statistics should be updated
// and false otherwise
bool JumpDetection(int64_t rttMs);
// Detects RTT drifts by comparing the difference between
// max and average to the standard deviation.
// Returns true if the long time statistics should be updated
// and false otherwise
bool DriftDetection(int64_t rttMs);
// Computes the short time average and maximum of the vector buf.
void ShortRttFilter(int64_t* buf, uint32_t length);
bool _gotNonZeroUpdate;
double _avgRtt;
double _varRtt;
int64_t _maxRtt;
uint32_t _filtFactCount;
const uint32_t _filtFactMax;
const double _jumpStdDevs;
const double _driftStdDevs;
int32_t _jumpCount;
int32_t _driftCount;
const int32_t _detectThreshold;
int64_t _jumpBuf[kMaxDriftJumpCount];
int64_t _driftBuf[kMaxDriftJumpCount];
};
} // namespace webrtc
#endif // WEBRTC_MODULES_VIDEO_CODING_RTT_FILTER_H_
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