NeuralSynth/Source/ScopeDataCollector.h

#pragma once

template <typename SampleType>
class ScopeDataCollector
{
public:
    //==============================================================================
    ScopeDataCollector(AudioBufferQueue<SampleType>& queueToUse)
        : audioBufferQueue(queueToUse)
    {
    }

    //==============================================================================
    void process(const SampleType* data, size_t numSamples)
    {
        size_t index = 0;

        if (state == State::waitingForTrigger)
        {
            while (index++ < numSamples)
            {
                auto currentSample = *data++;

                if (currentSample >= triggerLevel && prevSample < triggerLevel)
                {
                    numCollected = 0;
                    state = State::collecting;
                    break;
                }

                prevSample = currentSample;
            }
        }

        if (state == State::collecting)
        {
            while (index++ < numSamples)
            {
                buffer[numCollected++] = *data++;

                if (numCollected == buffer.size())
                {
                    audioBufferQueue.push(buffer.data(), buffer.size());
                    state = State::waitingForTrigger;
                    prevSample = SampleType(100);
                    break;
                }
            }
        }
    }

private:
    //==============================================================================
    AudioBufferQueue<SampleType>& audioBufferQueue;
    std::array<SampleType, AudioBufferQueue<SampleType>::bufferSize> buffer;
    size_t numCollected;
    SampleType prevSample = SampleType(100);

    static constexpr auto triggerLevel = SampleType(0.05);

    enum class State { waitingForTrigger, collecting } state{ State::waitingForTrigger };
};