ConvolverNode.h   [plain text]

/*
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 * Copyright (C) 2020, Apple Inc. All rights reserved.
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#pragma once

#include "AudioNode.h"
#include "ConvolverOptions.h"
#include <wtf/Lock.h>

namespace WebCore {

class AudioBuffer;
class Reverb;
    
class ConvolverNode final : public AudioNode {
    WTF_MAKE_ISO_ALLOCATED(ConvolverNode);
public:
    static ExceptionOr<Ref<ConvolverNode>> create(BaseAudioContext&, ConvolverOptions&& = { });
    
    virtual ~ConvolverNode();
    
    ExceptionOr<void> setBuffer(RefPtr<AudioBuffer>&&);
    AudioBuffer* buffer();

    bool normalize() const { return m_normalize; }
    void setNormalize(bool normalize) { m_normalize = normalize; }

    ExceptionOr<void> setChannelCount(unsigned) final;
    ExceptionOr<void> setChannelCountMode(ChannelCountMode) final;

private:
    explicit ConvolverNode(BaseAudioContext&);

    double tailTime() const final;
    double latencyTime() const final;
    bool requiresTailProcessing() const final;

    void process(size_t framesToProcess) final;
    void checkNumberOfChannelsForInput(AudioNodeInput*) final;

    std::unique_ptr<Reverb> m_reverb;
    RefPtr<AudioBuffer> m_buffer;

    // This synchronizes dynamic changes to the convolution impulse response with process().
    mutable Lock m_processLock;

    // Normalize the impulse response or not.
    bool m_normalize { true };
};

} // namespace WebCore