chromium/third_party/webrtc/modules/audio_processing/agc2/limiter_db_gain_curve.h

/*
 *  Copyright (c) 2018 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_AGC2_LIMITER_DB_GAIN_CURVE_H_
#define MODULES_AUDIO_PROCESSING_AGC2_LIMITER_DB_GAIN_CURVE_H_

#include <array>

#include "modules/audio_processing/agc2/agc2_testing_common.h"

namespace webrtc {

// A class for computing a limiter gain curve (in dB scale) given a set of
// hard-coded parameters (namely, kLimiterDbGainCurveMaxInputLevelDbFs,
// kLimiterDbGainCurveKneeSmoothnessDb, and
// kLimiterDbGainCurveCompressionRatio). The generated curve consists of four
// regions: identity (linear), knee (quadratic polynomial), compression
// (linear), saturation (linear). The aforementioned constants are used to shape
// the different regions.
class LimiterDbGainCurve { … };

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AGC2_LIMITER_DB_GAIN_CURVE_H_