Add constructors for WebAudio nodes

third_party/WebKit/Source/modules/webaudio/DynamicsCompressorNode.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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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/DynamicsCompressorNode.h"
+#include "modules/webaudio/DynamicsCompressorOptions.h"
 #include "platform/audio/DynamicsCompressor.h"
 #include "wtf/PtrUtil.h"
 
 // Set output to stereo by default.
 static const unsigned defaultNumberOfOutputChannels = 2;
 
 namespace blink {
 
 DynamicsCompressorHandler::DynamicsCompressorHandler(
     AudioNode& node,
@@ skipping 111 matching lines @@
     DCHECK(isMainThread());
 
     if (context.isContextClosed()) {
         context.throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return new DynamicsCompressorNode(context);
 }
 
+DynamicsCompressorNode* DynamicsCompressorNode::create(BaseAudioContext* context, const DynamicsCompressorOptions& options, ExceptionState& exceptionState)
+{
+    DynamicsCompressorNode* node = create(*context, exceptionState);
+
+    if (!node)
+        return nullptr;
+
+    node->handleChannelOptions(options, exceptionState);
+
+    if (options.hasAttack())
+        node->attack()->setValue(options.attack());
+    if (options.hasKnee())
+        node->knee()->setValue(options.knee());
+    if (options.hasRatio())
+        node->ratio()->setValue(options.ratio());
+    if (options.hasRelease())
+        node->release()->setValue(options.release());
+    if (options.hasThreshold())
+        node->threshold()->setValue(options.threshold());
+
+    return node;
+}
+
 DEFINE_TRACE(DynamicsCompressorNode)
 {
     visitor->trace(m_threshold);
     visitor->trace(m_knee);
     visitor->trace(m_ratio);
     visitor->trace(m_attack);
     visitor->trace(m_release);
     AudioNode::trace(visitor);
 }
 
@@ skipping 27 matching lines @@
     return m_attack;
 }
 
 AudioParam* DynamicsCompressorNode::release() const
 {
     return m_release;
 }
 
 } // namespace blink