audiofunctions.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
#pragma once
 
#include <mathutils.h>
 
namespace nap
{
    namespace audio
    {
 
        inline unsigned int wrap(unsigned int index, unsigned int bufferSize)
        {
            unsigned int bitMask = bufferSize - 1;
            return index & bitMask;
        }
 
 
        template<typename T>
        inline T lerp(const T& v0, const T& v1, const T& t)
        {
            return v0 + t * (v1 - v0);
        }
 
        template<typename T>
        inline void equalPowerPan(const T& panning, T& left, T& right)
        {
            left = cos(panning * 0.5 * math::PI);
            right = sin(panning * 0.5 * math::PI);
        }
 
 
        inline float mtof(float pitch)
        {
            auto res = pitch - 57;
            res /= 12.0;
            res = pow(2.0, res);
            res *= 220.0;
            return res;
        }
 
 
        inline float toDB(float amplitude)
        {
            return 20 * log10(amplitude);
        }
 
 
        inline float dbToA(float db, float zero = -48)
        {
            if (db <= zero)
                return 0;
 
            return powf(10, db / 20.0);
        }
 
    }
}