Source/WebCore/Modules/webaudio/ChannelMergerNode.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#pragma once

#include "AudioNode.h"

namespace WebCore {

class AudioContext;
    
class ChannelMergerNode final : public AudioNode {
    WTF_MAKE_ISO_ALLOCATED(ChannelMergerNode);
public:
    static RefPtr<ChannelMergerNode> create(AudioContext&, float sampleRate, unsigned numberOfInputs);

    // AudioNode
    void process(size_t framesToProcess) override;
    void reset() override;

    // Called in the audio thread (pre-rendering task) when the number of channels for an input may have changed.
    void checkNumberOfChannelsForInput(AudioNodeInput*) override;

private:
    unsigned m_desiredNumberOfOutputChannels;

    double tailTime() const override { return 0; }
    double latencyTime() const override { return 0; }

    ChannelMergerNode(AudioContext&, float sampleRate, unsigned numberOfInputs);
};

} // namespace WebCore