39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
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#define MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
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#include "api/array_view.h"
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namespace webrtc {
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// Sqrt approximation.
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float SqrtFastApproximation(float f);
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// Log base conversion log(x) = log2(x)/log2(e).
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float LogApproximation(float x);
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void LogApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
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// 2^x approximation.
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float Pow2Approximation(float p);
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// x^p approximation.
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float PowApproximation(float x, float p);
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// e^x approximation.
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float ExpApproximation(float x);
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void ExpApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
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void ExpApproximationSignFlip(rtc::ArrayView<const float> x,
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rtc::ArrayView<float> y);
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
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