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