81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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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/Audio/Algorithm.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 Get the number of channels occupied by an audio format
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* \returns The number of channels occupied by an audio format (mono returns 1, stero returns 2, etc.)
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*
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* \param format A valid audio format
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*
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* \remark The format must be valid (using AudioFormat::Unknown will trigger an error)
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*/
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UInt32 GetChannelCount(AudioFormat format)
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{
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NazaraAssert(format != AudioFormat::Unknown, "invalid audio format");
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switch (format)
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{
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case AudioFormat::Unknown: //< Just to make the compiler stop complaining
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break;
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case AudioFormat::I16_Mono:
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return 1;
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case AudioFormat::I16_Stereo:
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return 2;
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case AudioFormat::I16_Quad:
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return 4;
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case AudioFormat::I16_5_1:
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return 6;
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case AudioFormat::I16_6_1:
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return 7;
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case AudioFormat::I16_7_1:
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return 8;
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}
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return 0;
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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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using BiggestInt = typename std::conditional<std::is_unsigned<T>::value, UInt64, Int64>::type;
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using Biggest = typename std::conditional<std::is_integral<T>::value, BiggestInt, double>::type;
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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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