Source/WebCore/Modules/webaudio/AnalyserNode.cpp

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

#if ENABLE(WEB_AUDIO)

#include "AnalyserNode.h"

#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(AnalyserNode);

AnalyserNode::AnalyserNode(BaseAudioContext& context, float sampleRate)
    : AudioBasicInspectorNode(context, sampleRate, 2)
{
    setNodeType(NodeTypeAnalyser);
    
    initialize();
}

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

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

ExceptionOr<void> AnalyserNode::setFftSize(unsigned size)
{
    if (!m_analyser.setFftSize(size))
        return Exception { IndexSizeError };
    return { };
}

ExceptionOr<void> AnalyserNode::setMinDecibels(double k)
{
    if (k > maxDecibels())
        return Exception { IndexSizeError };

    m_analyser.setMinDecibels(k);
    return { };
}

ExceptionOr<void> AnalyserNode::setMaxDecibels(double k)
{
    if (k < minDecibels())
        return Exception { IndexSizeError };

    m_analyser.setMaxDecibels(k);
    return { };
}

ExceptionOr<void> AnalyserNode::setSmoothingTimeConstant(double k)
{
    if (k < 0 || k > 1)
        return Exception { IndexSizeError };

    m_analyser.setSmoothingTimeConstant(k);
    return { };
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)