RealtimeAnalyserNode.cpp   [plain text]

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "RealtimeAnalyserNode.h"

#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include "ExceptionCode.h"

namespace WebCore {

RealtimeAnalyserNode::RealtimeAnalyserNode(AudioContext* context, float sampleRate)
    : AudioBasicInspectorNode(context, sampleRate)
{
    addInput(adoptPtr(new AudioNodeInput(this)));
    addOutput(adoptPtr(new AudioNodeOutput(this, 2)));
    
    setNodeType(NodeTypeAnalyser);
    
    initialize();
}

RealtimeAnalyserNode::~RealtimeAnalyserNode()
{
    uninitialize();
}

void RealtimeAnalyserNode::process(size_t framesToProcess)
{
    AudioBus* outputBus = output(0)->bus();

    if (!isInitialized() || !input(0)->isConnected()) {
        outputBus->zero();
        return;
    }

    AudioBus* inputBus = input(0)->bus();
    
    // Give the analyser the audio which is passing through this AudioNode.
    m_analyser.writeInput(inputBus, framesToProcess);

    // For in-place processing, our override of pullInputs() will just pass the audio data through unchanged if the channel count matches from input to output
    // (resulting in inputBus == outputBus).  Otherwise, do an up-mix to stereo.
    if (inputBus != outputBus)
        outputBus->copyFrom(*inputBus);
}

void RealtimeAnalyserNode::reset()
{
    m_analyser.reset();
}

void RealtimeAnalyserNode::setFftSize(unsigned int size, ExceptionCode& ec)
{
    if (!m_analyser.setFftSize(size))
        ec = NOT_SUPPORTED_ERR;
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)