third_party/WebKit/Source/modules/webaudio/DelayNode.cpp

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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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/DelayOptions.h"
#include "modules/webaudio/DelayProcessor.h"
#include "wtf/MathExtras.h"
#include "wtf/PtrUtil.h"

namespace blink {

const double maximumAllowedDelayTime = 180;

DelayNode::DelayNode(BaseAudioContext& 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(BaseAudioContext& 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(BaseAudioContext& 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);
}

DelayNode* DelayNode::create(BaseAudioContext* context,
                             const DelayOptions& options,
                             ExceptionState& exceptionState) {
  // maxDelayTime has a default value specified.
  DelayNode* node = create(*context, options.maxDelayTime(), exceptionState);

  if (!node)
    return nullptr;

  node->handleChannelOptions(options, exceptionState);

  if (options.hasDelayTime())
    node->delayTime()->setValue(options.delayTime());

  return node;
}

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

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

}  // namespace blink