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/*
* Copyright (c) 2025 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_AUDIO_PROCESSING_CAPTURE_MIXER_ENERGY_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_CAPTURE_MIXER_ENERGY_ESTIMATOR_H_
#include <stddef.h>
#include <array>
#include "api/array_view.h"
namespace webrtc {
// Estimates the average energy of two audio channels, compensating for DC
// offsets.
class AverageEnergyEstimator {
public:
// Constructs an AverageEnergyEstimator.
AverageEnergyEstimator();
AverageEnergyEstimator(const AverageEnergyEstimator&) = delete;
AverageEnergyEstimator& operator=(const AverageEnergyEstimator&) = delete;
// Updates the average energy estimates for the two channels.
// `channel0` and `channel1` contain the samples of the two channels.
// `dc_levels` contains the estimated DC offsets for the two channels, which
// are subtracted from the samples before energy calculation.
void Update(ArrayView<const float> channel0,
ArrayView<const float> channel1,
ArrayView<const float, 2> dc_levels);
// Returns the current average energy estimates for the two channels.
ArrayView<const float, 2> GetChannelEnergies() const {
return average_energy_in_channels_;
}
private:
std::array<float, 2> average_energy_in_channels_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_CAPTURE_MIXER_ENERGY_ESTIMATOR_H_