pcmbufferaudiosource.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/dsputilities.h"

namespace ttv
{
    template <typename BufferFormat, typename ContextType, size_t SelectedChannelIndex = 0>
    class PCMBufferAudioSource
    {
    public:
        using SampleType = typename BufferFormat::SampleType;
        static constexpr size_t SampleRate = BufferFormat::SampleRate;
        static constexpr size_t ChannelCount = BufferFormat::ChannelCount;
        
        static_assert(SelectedChannelIndex < ChannelCount, "Selected channel index out of bounds.");
        
        PCMBufferAudioSource(ContextType& context)
        :   mBuffer(nullptr)
        {
        }
        
        
        void Bind(const SampleType* buffer, SampleRange range)
        {
            assert(buffer != nullptr);
            assert(range.sampleCount != 0);
            
            mBuffer = buffer;
            mRange = range;
        }
        
        
        void Unbind()
        {
            mBuffer = nullptr;
            mRange = {};
        }
        
        
        SampleRange GetSampleRange() const
        {
            return mRange;
        }

        
        SampleType operator[](size_t index) const
        {
            assert(index >= GetSampleRange().startIndex);
            assert(index < GetSampleRange().startIndex + GetSampleRange().sampleCount);

            size_t bufferIndex = ((index - mRange.startIndex) * ChannelCount) + SelectedChannelIndex;

            return mBuffer[bufferIndex];
        }
        
    private:
        const SampleType* mBuffer;
        SampleRange mRange;
    };
}