ChannelMapper.h

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#pragma once
#include "DoubleBufferedAudioEffect.h"
#include <unordered_map>
#include <functional>
 
namespace HephAudio
{
    class HEPH_API ChannelMapper : public DoubleBufferedAudioEffect
    {
    protected:
        struct AudioChannelLayoutHasher
        {
            size_t operator()(const AudioChannelLayout& chLayout) const;
        };
 
        typedef std::unordered_map<
            AudioChannelLayout,
            std::unordered_map<AudioChannelLayout, std::function<void(heph_audio_sample_t*, heph_audio_sample_t*)>, AudioChannelLayoutHasher>,
            AudioChannelLayoutHasher> ChannelMapperMap;
 
    protected:
        static ChannelMapperMap map;
 
    protected:
        AudioChannelLayout targetLayout;
 
    public:
        ChannelMapper();
 
        explicit ChannelMapper(const AudioChannelLayout& targetLayout);
 
        virtual ~ChannelMapper() = default;
 
        virtual std::string Name() const override;
 
        virtual const AudioChannelLayout& GetTargetLayout() const;
 
        virtual void SetTargetLayout(const AudioChannelLayout& targetLayout);
 
    protected:
        virtual void ProcessST(const AudioBuffer& inputBuffer, AudioBuffer& outputBuffer, size_t startIndex, size_t frameCount) override;
        virtual AudioBuffer CreateOutputBuffer(const AudioBuffer& inputBuffer, size_t startIndex, size_t frameCount) const override;
        virtual void InitializeOutputBuffer(const AudioBuffer& inputBuffer, AudioBuffer& outputBuffer, size_t startIndex, size_t frameCount) const override;
 
    public:
        static void SetMapping(const AudioChannelLayout& targetLayout, const AudioChannelLayout& inputLayout, const std::function<void(heph_audio_sample_t*, heph_audio_sample_t*)>& f);
 
    protected:
        static ChannelMapperMap CreateMap();
    };
}