Source/WebCore/Modules/webaudio/DelayNode.cpp

/*
 * Copyright (C) 2010, 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
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "DelayNode.h"

#include "DelayOptions.h"
#include "DelayProcessor.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(DelayNode);

constexpr double maximumAllowedDelayTime = 180;

inline DelayNode::DelayNode(BaseAudioContext& context, double maxDelayTime)
    : AudioBasicProcessorNode(context, NodeTypeDelay)
{
    m_processor = makeUnique<DelayProcessor>(context, context.sampleRate(), 1, maxDelayTime);

    // Initialize so that AudioParams can be processed.
    initialize();
}

ExceptionOr<Ref<DelayNode>> DelayNode::create(BaseAudioContext& context, const DelayOptions& options)
{
    if (options.maxDelayTime <= 0)
        return Exception { NotSupportedError, "maxDelayTime should be a positive value"_s };

    if (options.maxDelayTime >= maximumAllowedDelayTime)
        return Exception { NotSupportedError, makeString("maxDelayTime should be less than ", maximumAllowedDelayTime) };

    auto delayNode = adoptRef(*new DelayNode(context, options.maxDelayTime));

    auto result = delayNode->handleAudioNodeOptions(options, { 2, ChannelCountMode::Max, ChannelInterpretation::Speakers });
    if (result.hasException())
        return result.releaseException();

    delayNode->delayTime().setValue(options.delayTime);

    return delayNode;
}

AudioParam& DelayNode::delayTime()
{
    return static_cast<DelayProcessor&>(*m_processor).delayTime();
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)