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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 MODULES_VIDEO_CODING_TIMING_RTT_FILTER_H_
#define MODULES_VIDEO_CODING_TIMING_RTT_FILTER_H_
#include <stdint.h>
#include "absl/container/inlined_vector.h"
#include "api/units/time_delta.h"
namespace webrtc {
class RttFilter {
public:
RttFilter();
RttFilter(const RttFilter&) = delete;
RttFilter& operator=(const RttFilter&) = delete;
// Resets the filter.
void Reset();
// Updates the filter with a new sample.
void Update(TimeDelta rtt);
// A getter function for the current RTT level.
TimeDelta Rtt() const;
private:
// The size of the drift and jump memory buffers
// and thus also the detection threshold for these
// detectors in number of samples.
static constexpr int kMaxDriftJumpCount = 5;
using BufferList = absl::InlinedVector<TimeDelta, kMaxDriftJumpCount>;
// 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(TimeDelta rtt);
// 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(TimeDelta rtt);
// Computes the short time average and maximum of the vector buf.
void ShortRttFilter(const BufferList& buf);
bool got_non_zero_update_;
TimeDelta avg_rtt_;
// Variance units are TimeDelta^2. Store as ms^2.
int64_t var_rtt_;
TimeDelta max_rtt_;
uint32_t filt_fact_count_;
bool last_jump_positive_ = false;
BufferList jump_buf_;
BufferList drift_buf_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_TIMING_RTT_FILTER_H_
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