diff -r 000000000000 -r 6474c204b198 content/media/webaudio/AudioParam.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/webaudio/AudioParam.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,193 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef AudioParam_h_
+#define AudioParam_h_
+
+#include "AudioParamTimeline.h"
+#include "nsWrapperCache.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsAutoPtr.h"
+#include "AudioNode.h"
+#include "mozilla/dom/TypedArray.h"
+#include "WebAudioUtils.h"
+#include "js/TypeDecls.h"
+
+namespace mozilla {
+
+namespace dom {
+
+class AudioParam MOZ_FINAL : public nsWrapperCache,
+                             public AudioParamTimeline
+{
+public:
+  typedef void (*CallbackType)(AudioNode*);
+
+  AudioParam(AudioNode* aNode,
+             CallbackType aCallback,
+             float aDefaultValue);
+  virtual ~AudioParam();
+
+  NS_IMETHOD_(MozExternalRefCountType) AddRef(void);
+  NS_IMETHOD_(MozExternalRefCountType) Release(void);
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioParam)
+
+  AudioContext* GetParentObject() const
+  {
+    return mNode->Context();
+  }
+
+  double DOMTimeToStreamTime(double aTime) const
+  {
+    return mNode->Context()->DOMTimeToStreamTime(aTime);
+  }
+
+  virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
+
+  // We override SetValueCurveAtTime to convert the Float32Array to the wrapper
+  // object.
+  void SetValueCurveAtTime(const Float32Array& aValues, double aStartTime, double aDuration, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    aValues.ComputeLengthAndData();
+    AudioParamTimeline::SetValueCurveAtTime(aValues.Data(), aValues.Length(),
+                                            DOMTimeToStreamTime(aStartTime), aDuration, aRv);
+    mCallback(mNode);
+  }
+
+  // We override the rest of the mutating AudioParamTimeline methods in order to make
+  // sure that the callback is called every time that this object gets mutated.
+  void SetValue(float aValue)
+  {
+    // Optimize away setting the same value on an AudioParam
+    if (HasSimpleValue() &&
+        WebAudioUtils::FuzzyEqual(GetValue(), aValue)) {
+      return;
+    }
+    AudioParamTimeline::SetValue(aValue);
+    mCallback(mNode);
+  }
+  void SetValueAtTime(float aValue, double aStartTime, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    AudioParamTimeline::SetValueAtTime(aValue, DOMTimeToStreamTime(aStartTime), aRv);
+    mCallback(mNode);
+  }
+  void LinearRampToValueAtTime(float aValue, double aEndTime, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aEndTime)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    AudioParamTimeline::LinearRampToValueAtTime(aValue, DOMTimeToStreamTime(aEndTime), aRv);
+    mCallback(mNode);
+  }
+  void ExponentialRampToValueAtTime(float aValue, double aEndTime, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aEndTime)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    AudioParamTimeline::ExponentialRampToValueAtTime(aValue, DOMTimeToStreamTime(aEndTime), aRv);
+    mCallback(mNode);
+  }
+  void SetTargetAtTime(float aTarget, double aStartTime, double aTimeConstant, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aStartTime) ||
+        !WebAudioUtils::IsTimeValid(aTimeConstant)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    AudioParamTimeline::SetTargetAtTime(aTarget, DOMTimeToStreamTime(aStartTime), aTimeConstant, aRv);
+    mCallback(mNode);
+  }
+  void CancelScheduledValues(double aStartTime, ErrorResult& aRv)
+  {
+    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return;
+    }
+    AudioParamTimeline::CancelScheduledValues(DOMTimeToStreamTime(aStartTime));
+    mCallback(mNode);
+  }
+
+  float DefaultValue() const
+  {
+    return mDefaultValue;
+  }
+
+  AudioNode* Node() const
+  {
+    return mNode;
+  }
+
+  const nsTArray<AudioNode::InputNode>& InputNodes() const
+  {
+    return mInputNodes;
+  }
+
+  void RemoveInputNode(uint32_t aIndex)
+  {
+    mInputNodes.RemoveElementAt(aIndex);
+  }
+
+  AudioNode::InputNode* AppendInputNode()
+  {
+    return mInputNodes.AppendElement();
+  }
+
+  void DisconnectFromGraphAndDestroyStream();
+
+  // May create the stream if it doesn't exist
+  MediaStream* Stream();
+
+  virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
+  {
+    size_t amount = AudioParamTimeline::SizeOfExcludingThis(aMallocSizeOf);
+    // Not owned:
+    // - mNode
+
+    // Just count the array, actual nodes are counted in mNode.
+    amount += mInputNodes.SizeOfExcludingThis(aMallocSizeOf);
+
+    if (mNodeStreamPort) {
+      amount += mNodeStreamPort->SizeOfIncludingThis(aMallocSizeOf);
+    }
+
+    return amount;
+  }
+
+  virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
+  {
+    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+  }
+
+protected:
+  nsCycleCollectingAutoRefCnt mRefCnt;
+  NS_DECL_OWNINGTHREAD
+
+private:
+  nsRefPtr<AudioNode> mNode;
+  // For every InputNode, there is a corresponding entry in mOutputParams of the
+  // InputNode's mInputNode.
+  nsTArray<AudioNode::InputNode> mInputNodes;
+  CallbackType mCallback;
+  const float mDefaultValue;
+  // The input port used to connect the AudioParam's stream to its node's stream
+  nsRefPtr<MediaInputPort> mNodeStreamPort;
+};
+
+}
+}
+
+#endif
+