chromium/third_party/webrtc/modules/audio_processing/agc2/interpolated_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_INTERPOLATED_GAIN_CURVE_H_
#define MODULES_AUDIO_PROCESSING_AGC2_INTERPOLATED_GAIN_CURVE_H_

#include <array>

#include "absl/strings/string_view.h"
#include "modules/audio_processing/agc2/agc2_common.h"
#include "rtc_base/gtest_prod_util.h"
#include "system_wrappers/include/metrics.h"

namespace webrtc {

class ApmDataDumper;

constexpr float kInputLevelScalingFactor = …;

// Defined as DbfsToLinear(kLimiterMaxInputLevelDbFs)
constexpr float kMaxInputLevelLinear = …;

// Interpolated gain curve using under-approximation to avoid saturation.
//
// The goal of this class is allowing fast look ups to get an accurate
// estimates of the gain to apply given an estimated input level.
class InterpolatedGainCurve { … };

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AGC2_INTERPOLATED_GAIN_CURVE_H_