filmstro_audiohelpers_AudioProcessorPlayerSource.h

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/*
 ==============================================================================
 Copyright (c) 2017, Filmstro Ltd. - Daniel Walz
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 ==============================================================================
 \class        AudioProcessorPlayerSource
 \file         filmstro_audiobasics_AudioProcessorPlayerSource.h
 \brief        An AudioSource to playback audioProcessors

 \author       Daniel Walz / Filmstro Ltd.
 \date         December 15th 2016

 \description  An AudioSource playing back an AudioProcessor

 ==============================================================================
 */


#ifndef filmstro_audiobasics_AudioProcessorPlayerSource_h
#define filmstro_audiobasics_AudioProcessorPlayerSource_h

class AudioProcessorPlayerSource : public juce::AudioSource
{
public:
    AudioProcessorPlayerSource (juce::AudioProcessor* proc, const int channels = 2,
                                const bool deleteProcessor = true)
      : processor (proc, deleteProcessor),
        numChannels (channels),
        fifo (channels, 4096)
    {
        
    }

    virtual ~AudioProcessorPlayerSource ()
    {
    }

    void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override
    {
        buffer.setSize (numChannels, samplesPerBlockExpected);
        if (processor) {
            buffer.setSize (numChannels, samplesPerBlockExpected);
            processor->prepareToPlay (sampleRate, samplesPerBlockExpected);
        }
    }

    void releaseResources () override
    {
        if (processor) {
            processor->releaseResources ();
        }
    }

    void setProcessor (juce::AudioProcessor* proc, const bool deleteProcessor)
    {
        fifo.clear ();
        processor.set (proc, deleteProcessor);
    }

    juce::AudioProcessor* getCurrentProcessor () const
    {
        return processor;
    }

    void getNextAudioBlock (const juce::AudioSourceChannelInfo &bufferToFill) override
    {
        if (processor) {
            juce::MidiBuffer midiBuffer;
            while (fifo.getNumReady() < bufferToFill.numSamples) {
                processor->processBlock (buffer, midiBuffer);
                fifo.addToFifo (buffer);
            }
            const int ready = fifo.getNumReady ();
            if (ready >= bufferToFill.numSamples)
            {
                fifo.readFromFifo (bufferToFill);
            }
            else if (ready > 0) {
                fifo.readFromFifo (bufferToFill, ready);
                bufferToFill.buffer->clear (bufferToFill.startSample + ready, bufferToFill.numSamples - ready);
            }
            else {
                bufferToFill.clearActiveBufferRegion ();
            }
        }
        else {
            bufferToFill.clearActiveBufferRegion();
        }
    }

private:

    juce::OptionalScopedPointer<juce::AudioProcessor> processor;

    int                       numChannels;

    // buffer some audio data
    AudioBufferFIFO<float>    fifo;

    // processor buffer
    juce::AudioBuffer<float>  buffer;
};



#endif /* filmstro_audiobasics_AudioProcessorPlayerSource_h */