Source/modules/webaudio/WaveShaperNode.cpp

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "modules/webaudio/WaveShaperNode.h"

#include "bindings/v8/ExceptionMessages.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "wtf/MainThread.h"

namespace WebCore {

WaveShaperNode::WaveShaperNode(AudioContext* context)
    : AudioBasicProcessorNode(context, context->sampleRate())
{
    ScriptWrappable::init(this);
    m_processor = adoptPtr(new WaveShaperProcessor(context->sampleRate(), 1));
    setNodeType(NodeTypeWaveShaper);

    initialize();
}

void WaveShaperNode::setCurve(Float32Array* curve)
{
    ASSERT(isMainThread());
    waveShaperProcessor()->setCurve(curve);
}

Float32Array* WaveShaperNode::curve()
{
    return waveShaperProcessor()->curve();
}

void WaveShaperNode::setOversample(const String& type, ExceptionState& exceptionState)
{
    ASSERT(isMainThread());

    // This is to synchronize with the changes made in
    // AudioBasicProcessorNode::checkNumberOfChannelsForInput() where we can
    // initialize() and uninitialize().
    AudioContext::AutoLocker contextLocker(context());

    if (type == "none") {
        waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSampleNone);
    } else if (type == "2x") {
        waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample2x);
    } else if (type == "4x") {
        waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample4x);
    } else {
        exceptionState.throwDOMException(
            InvalidStateError,
            ExceptionMessages::failedToSet(
                "oversample",
                "WaveShaperNode",
                "invalid oversample '" + type + "': must be 'none', '2x', or '4x'."));
    }
}

String WaveShaperNode::oversample() const
{
    switch (const_cast<WaveShaperNode*>(this)->waveShaperProcessor()->oversample()) {
    case WaveShaperProcessor::OverSampleNone:
        return "none";
    case WaveShaperProcessor::OverSample2x:
        return "2x";
    case WaveShaperProcessor::OverSample4x:
        return "4x";
    default:
        ASSERT_NOT_REACHED();
        return "none";
    }
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)