third_party/WebKit/Source/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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#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "modules/webaudio/AudioBasicProcessorHandler.h"
#include "modules/webaudio/DelayNode.h"
#include "modules/webaudio/DelayProcessor.h"
#include "wtf/MathExtras.h"
#include "wtf/PtrUtil.h"

namespace blink {

const double maximumAllowedDelayTime = 180;

DelayNode::DelayNode(AbstractAudioContext& context, double maxDelayTime)
    : AudioNode(context)
    , m_delayTime(AudioParam::create(context, ParamTypeDelayDelayTime, 0.0, 0.0, maxDelayTime))
{
    setHandler(AudioBasicProcessorHandler::create(
        AudioHandler::NodeTypeDelay,
        *this,
        context.sampleRate(),
        wrapUnique(new DelayProcessor(
            context.sampleRate(),
            1,
            m_delayTime->handler(),
            maxDelayTime))));
}

DelayNode* DelayNode::create(AbstractAudioContext& context, ExceptionState& exceptionState)
{
    DCHECK(isMainThread());

    // The default maximum delay time for the delay node is 1 sec.
    return create(context, 1, exceptionState);
}

DelayNode* DelayNode::create(AbstractAudioContext& context, double maxDelayTime, ExceptionState& exceptionState)
{
    DCHECK(isMainThread());

    if (context.isContextClosed()) {
        context.throwExceptionForClosedState(exceptionState);
        return nullptr;
    }

    if (maxDelayTime <= 0 || maxDelayTime >= maximumAllowedDelayTime) {
        exceptionState.throwDOMException(
            NotSupportedError,
            ExceptionMessages::indexOutsideRange(
                "max delay time",
                maxDelayTime,
                0.0,
                ExceptionMessages::ExclusiveBound,
                maximumAllowedDelayTime,
                ExceptionMessages::ExclusiveBound));
        return nullptr;
    }

    return new DelayNode(context, maxDelayTime);
}

AudioParam* DelayNode::delayTime()
{
    return m_delayTime;
}

DEFINE_TRACE(DelayNode)
{
    visitor->trace(m_delayTime);
    AudioNode::trace(visitor);
}

} // namespace blink