audioconvertcontext.h

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/********************************************************************************************
 * Twitch Broadcasting SDK
 *
 * This software is supplied under the terms of a license agreement with Twitch Interactive, Inc. and
 * may not be copied or used except in accordance with the terms of that agreement
 * Copyright (c) 2012-2017 Twitch Interactive, Inc.
 *
 *********************************************************************************************/

#pragma once

#include "twitchsdk/broadcast/internal/audioconvert/audioconvertoptions.h"
#include "twitchsdk/broadcast/internal/audioconvert/converttofloatingpointoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/converttointegraltypeoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/converttosignedoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/converttounsignedoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/decreasebitdepthoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/dsputilities.h"
#include "twitchsdk/broadcast/internal/audioconvert/resampleoperator.h"
#include "twitchsdk/broadcast/internal/audioconvert/increasebitdepthoperator.h"

namespace ttv
{
    template <typename PassedOptions = void>
    struct AudioConvertContext
    {
        using Options = AudioConvertOptionsDefaulter<PassedOptions>;
        
        template <typename Options>
        struct FilterOptionsProvider
        {
            static constexpr double Cutoff = Options::FilterCutoff;
            static constexpr size_t TapCount = Options::FilterTapCount;
            
            template <typename AudioOptions, typename Enable = void>
            struct WindowFunctionSelector
            {
            };
            
            template <typename AudioOptions>
            struct WindowFunctionSelector<AudioOptions, std::enable_if_t<AudioOptions::FilterType == FilterTypeEnum::Kaiser>>
            {
                struct KaiserParameters
                {
                    static constexpr double Beta = AudioOptions::KaiserBeta;
                    static constexpr size_t Length = AudioOptions::FilterTapCount;
                };
                
                using Type = KaiserBesselWindowFunctionGenerator<KaiserParameters>;
            };
            
            using WindowFunction = typename WindowFunctionSelector<Options>::Type;
        };
        
        using FilterOptions = FilterOptionsProvider<Options>;
    };
}