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40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
// Copyright (C) 2015 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Audio module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Error.hpp>
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#include <Nazara/Audio/Debug.hpp>
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namespace Nz
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{
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/*!
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* \ingroup audio
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* \brief Mixes channels in mono
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*
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* \param input Input buffer with multiples channels
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* \param output Output butter for mono
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* \param channelCount Number of channels
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* \param frameCount Number of frames
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*
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* \remark The input buffer may be the same as the output one
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*/
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template<typename T>
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void MixToMono(T* input, T* output, UInt32 channelCount, UInt64 frameCount)
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{
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// To avoid overflow, we use, as an accumulator, a type which is large enough: (u)int 64 bits for integers, double for floatings
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typedef typename std::conditional<std::is_unsigned<T>::value, UInt64, Int64>::type BiggestInt;
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typedef typename std::conditional<std::is_integral<T>::value, BiggestInt, double>::type Biggest;
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for (UInt64 i = 0; i < frameCount; ++i)
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{
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Biggest acc = Biggest(0);
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for (UInt32 j = 0; j < channelCount; ++j)
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acc += input[i * channelCount + j];
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output[i] = static_cast<T>(acc / channelCount);
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}
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}
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}
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#include <Nazara/Audio/DebugOff.hpp>
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