Source/WebCore/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
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include "config.h"
#include "WaveShaperNode.h"

#if ENABLE(WEB_AUDIO)

#include "AudioContext.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/MainThread.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(WaveShaperNode);

WaveShaperNode::WaveShaperNode(AudioContext& context)
    : AudioBasicProcessorNode(context, context.sampleRate())
{
    setNodeType(NodeTypeWaveShaper);
    m_processor = makeUnique<WaveShaperProcessor>(context.sampleRate(), 1);

    initialize();
}

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

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

static inline WaveShaperProcessor::OverSampleType processorType(WaveShaperNode::OverSampleType type)
{
    switch (type) {
    case WaveShaperNode::OverSampleType::None:
        return WaveShaperProcessor::OverSampleNone;
    case WaveShaperNode::OverSampleType::_2x:
        return WaveShaperProcessor::OverSample2x;
    case WaveShaperNode::OverSampleType::_4x:
        return WaveShaperProcessor::OverSample4x;
    }
    ASSERT_NOT_REACHED();
    return WaveShaperProcessor::OverSampleNone;
}

void WaveShaperNode::setOversample(OverSampleType type)
{
    ASSERT(isMainThread());
    INFO_LOG(LOGIDENTIFIER, type);

    // Synchronize with any graph changes or changes to channel configuration.
    AudioContext::AutoLocker contextLocker(context());
    waveShaperProcessor()->setOversample(processorType(type));
}

auto WaveShaperNode::oversample() const -> OverSampleType
{
    switch (const_cast<WaveShaperNode*>(this)->waveShaperProcessor()->oversample()) {
    case WaveShaperProcessor::OverSampleNone:
        return OverSampleType::None;
    case WaveShaperProcessor::OverSample2x:
        return OverSampleType::_2x;
    case WaveShaperProcessor::OverSample4x:
        return OverSampleType::_4x;
    }
    ASSERT_NOT_REACHED();
    return OverSampleType::None;
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)