AudioUtils.h

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/*
 * Copyright (c) 2018 pongasoft
 *
 * Licensed under the Apache License, Version 2.0 or the MIT license,
 * at your option. You may not use this file except in compliance with
 * one of these licenses. You may obtain copies of the licenses at:
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 * https://opensource.org/licenses/MIT
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 * @author Yan Pujante
 */
#pragma once
 
#include <pluginterfaces/vst/ivstaudioprocessor.h>
 
#include <cmath>
#include <type_traits>
 
namespace pongasoft {
namespace VST {
 
using namespace Steinberg;
using namespace Steinberg::Vst;
 
#define BIT_SET(a,b) ((a) |= (static_cast<std::make_unsigned_t<decltype(a)>>(1)<<(b)))
#define BIT_CLEAR(a,b) ((a) &= ~(static_cast<std::make_unsigned_t<decltype(a)>>(1)<<(b)))
#define BIT_TEST(a,b) (((a) & (static_cast<std::make_unsigned_t<decltype(a)>>(1)<<(b))) != 0)

template<typename T>
constexpr T bitSet(T a, int bit) { return a | (static_cast<std::make_unsigned_t<T>>(1) << bit); }

template<typename T>
constexpr T bitClear(T a, int bit) { return a & ~(static_cast<std::make_unsigned_t<T>>(1) << bit); }

template<typename T>
constexpr bool bitTest(T a, int bit) { return (a & (static_cast<std::make_unsigned_t<T>>(1) << bit)) != 0; }
 
// defines the threshold of silence as constants
constexpr Sample32 Sample32SilentThreshold = ((Sample32)2.0e-8);
constexpr Sample64 Sample64SilentThreshold = ((Sample64)2.0e-8);
 
// defines the threshold of silence as a templated method
template<typename SampleType>
SampleType getSampleSilentThreshold() noexcept;
template<>
constexpr Sample32 getSampleSilentThreshold<Sample32>() noexcept { return Sample32SilentThreshold; }
template<>
constexpr Sample64 getSampleSilentThreshold<Sample64>() noexcept { return Sample64SilentThreshold; }
 
//------------------------------------------------------------------------
// check if sample is silent (lower than threshold) Sample32 version
//------------------------------------------------------------------------
inline bool isSilent(Sample32 value)
{
  if(value < 0)
    value = -value;
  return value <= Sample32SilentThreshold;
}
 
//------------------------------------------------------------------------
// check if sample is silent (lower than threshold) Sample64 version
//------------------------------------------------------------------------
inline bool isSilent(Sample64 value)
{
  if(value < 0)
    value = -value;
  return value <= Sample64SilentThreshold;
}
 
//------------------------------------------------------------------------
// dbToSample
//------------------------------------------------------------------------
template<typename SampleType>
inline SampleType dbToSample(double valueInDb)
{
  return static_cast<SampleType>(std::pow(10.0, valueInDb / 20.0));
}
 
//------------------------------------------------------------------------
// sampleToDb
//------------------------------------------------------------------------
template<typename SampleType>
inline double sampleToDb(SampleType valueInSample)
{
  return std::log10(valueInSample) * 20.0;
}
 
}
}