Source/WebCore/Modules/webaudio/BiquadFilterNode.cpp

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
 *
 * 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
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "BiquadFilterNode.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(BiquadFilterNode);

BiquadFilterNode::BiquadFilterNode(AudioContext& context, float sampleRate)
    : AudioBasicProcessorNode(context, sampleRate)
{
    setNodeType(NodeTypeBiquadFilter);

    // Initially setup as lowpass filter.
    m_processor = makeUnique<BiquadProcessor>(context, sampleRate, 1, false);
}

BiquadFilterType BiquadFilterNode::type() const
{
    return const_cast<BiquadFilterNode*>(this)->biquadProcessor()->type();
}

void BiquadFilterNode::setType(BiquadFilterType type)
{
    biquadProcessor()->setType(type);
}

void BiquadFilterNode::getFrequencyResponse(const RefPtr<Float32Array>& frequencyHz, const RefPtr<Float32Array>& magResponse, const RefPtr<Float32Array>& phaseResponse)
{
    if (!frequencyHz || !magResponse || !phaseResponse)
        return;
    
    int n = std::min(frequencyHz->length(), std::min(magResponse->length(), phaseResponse->length()));

    if (n)
        biquadProcessor()->getFrequencyResponse(n, frequencyHz->data(), magResponse->data(), phaseResponse->data());
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)