juce_AudioProcessorPlayer.h

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
//==============================================================================
class JUCE_API  AudioProcessorPlayer    : public AudioIODeviceCallback,
                                          public MidiInputCallback
{
public:
    //==============================================================================
    AudioProcessorPlayer (bool doDoublePrecisionProcessing = false);
 
    ~AudioProcessorPlayer() override;
 
    //==============================================================================
    void setProcessor (AudioProcessor* processorToPlay);
 
    AudioProcessor* getCurrentProcessor() const noexcept            { return processor; }
 
    MidiMessageCollector& getMidiMessageCollector() noexcept        { return messageCollector; }
 
    void setMidiOutput (MidiOutput* midiOutputToUse);
 
    void setDoublePrecisionProcessing (bool doublePrecision);
 
    inline bool getDoublePrecisionProcessing() { return isDoublePrecision; }
 
    //==============================================================================
    void audioDeviceIOCallbackWithContext (const float* const*, int, float* const*, int, int, const AudioIODeviceCallbackContext&) override;
    void audioDeviceAboutToStart (AudioIODevice*) override;
    void audioDeviceStopped() override;
    void handleIncomingMidiMessage (MidiInput*, const MidiMessage&) override;
 
private:
    struct NumChannels
    {
        NumChannels() = default;
        NumChannels (int numIns, int numOuts) : ins (numIns), outs (numOuts) {}
 
        explicit NumChannels (const AudioProcessor::BusesLayout& layout)
            : ins (layout.getNumChannels (true, 0)), outs (layout.getNumChannels (false, 0)) {}
 
        AudioProcessor::BusesLayout toLayout() const
        {
            return { { AudioChannelSet::canonicalChannelSet (ins) },
                     { AudioChannelSet::canonicalChannelSet (outs) } };
        }
 
        int ins = 0, outs = 0;
    };
 
    //==============================================================================
    NumChannels findMostSuitableLayout (const AudioProcessor&) const;
    void resizeChannels();
 
    //==============================================================================
    AudioProcessor* processor = nullptr;
    CriticalSection lock;
    double sampleRate = 0;
    int blockSize = 0;
    bool isPrepared = false, isDoublePrecision = false;
 
    NumChannels deviceChannels, defaultProcessorChannels, actualProcessorChannels;
    std::vector<float*> channels;
    AudioBuffer<float> tempBuffer;
    AudioBuffer<double> conversionBuffer;
 
    MidiBuffer incomingMidi;
    MidiMessageCollector messageCollector;
    MidiOutput* midiOutput = nullptr;
    uint64_t sampleCount = 0;
 
    AudioIODevice* currentDevice = nullptr;
    AudioWorkgroup currentWorkgroup;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioProcessorPlayer)
};
 
} // namespace juce