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/*
* Copyright (c) 2017 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.
*/
#include "modules/audio_processing/echo_detector/moving_max.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
// Parameter for controlling how fast the estimated maximum decays after the
// previous maximum is no longer valid. With a value of 0.99, the maximum will
// decay to 1% of its former value after 460 updates.
constexpr float kDecayFactor = 0.99f;
} // namespace
MovingMax::MovingMax(size_t window_size) : window_size_(window_size) {
RTC_DCHECK_GT(window_size, 0);
}
MovingMax::~MovingMax() {}
void MovingMax::Update(float value) {
if (counter_ >= window_size_ - 1) {
max_value_ *= kDecayFactor;
} else {
++counter_;
}
if (value > max_value_) {
max_value_ = value;
counter_ = 0;
}
}
float MovingMax::max() const {
return max_value_;
}
void MovingMax::Clear() {
max_value_ = 0.f;
counter_ = 0;
}
} // namespace webrtc
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