Source/modules/webaudio/AnalyserNode.cpp

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "modules/webaudio/AnalyserNode.h"

#include "bindings/v8/ExceptionMessages.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "modules/webaudio/AudioNodeOutput.h"

namespace WebCore {

AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
    : AudioBasicInspectorNode(context, sampleRate, 2)
{
    ScriptWrappable::init(this);
    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();
}

void AnalyserNode::setFftSize(unsigned size, ExceptionState& es)
{
    if (!m_analyser.setFftSize(size)) {
        es.throwDOMException(
            IndexSizeError,
            ExceptionMessages::failedToSet(
                "fftSize",
                "AnalyserNode",
                "FFT size (" + String::number(size)
                + ") must be a power of two between "
                + String::number(RealtimeAnalyser::MinFFTSize) + " and "
                + String::number(RealtimeAnalyser::MaxFFTSize) + ", inclusive"));
    }
}

void AnalyserNode::setMinDecibels(float k, ExceptionState& es)
{
    if (k <= maxDecibels()) {
        m_analyser.setMinDecibels(k);
    } else {
        es.throwDOMException(
            IndexSizeError,
            ExceptionMessages::failedToSet(
                "minDecibels",
                "AnalyserNode",
                "minDecibels (" + String::number(k)
                + ") must be less than or equal maxDecibels (" + String::number(maxDecibels())
                + ")."));
    }
}

void AnalyserNode::setMaxDecibels(float k, ExceptionState& es)
{
    if (k >= minDecibels()) {
        m_analyser.setMaxDecibels(k);
    } else {
        es.throwDOMException(
            IndexSizeError,
            ExceptionMessages::failedToSet(
                "maxDecibels",
                "AnalyserNode",
                "maxDecibels (" + String::number(k)
                + ") must be greater than or equal minDecibels (" + String::number(minDecibels())
                + ")."));
    }
}

void AnalyserNode::setSmoothingTimeConstant(float k, ExceptionState& es)
{
    if (k >= 0 && k <= 1) {
        m_analyser.setSmoothingTimeConstant(k);
    } else {
        es.throwDOMException(
            IndexSizeError,
            ExceptionMessages::failedToSet(
                "smoothingTimeConstant",
                "AnalyserNode",
                "smoothing value (" + String::number(k)
                + ") must be between 0 and 1, inclusive."));
    }
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)