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/*
* Copyright (c) 2019 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_NS_FAST_MATH_H_
#define MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
#include "api/array_view.h"
namespace webrtc {
// Sqrt approximation.
float SqrtFastApproximation(float f);
// Log base conversion log(x) = log2(x)/log2(e).
float LogApproximation(float x);
void LogApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
// 2^x approximation.
float Pow2Approximation(float p);
// x^p approximation.
float PowApproximation(float x, float p);
// e^x approximation.
float ExpApproximation(float x);
void ExpApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
void ExpApproximationSignFlip(rtc::ArrayView<const float> x,
rtc::ArrayView<float> y);
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_