--- a/dom/media/webaudio/AudioContext.cpp
+++ b/dom/media/webaudio/AudioContext.cpp
@@ -523,16 +523,17 @@ AudioContext::CreateOscillator(ErrorResu
   RefPtr<OscillatorNode> oscillatorNode =
     new OscillatorNode(this);
   return oscillatorNode.forget();
 }
 
 already_AddRefed<PeriodicWave>
 AudioContext::CreatePeriodicWave(const Float32Array& aRealData,
                                  const Float32Array& aImagData,
+                                 const PeriodicWaveConstraints& aConstraints,
                                  ErrorResult& aRv)
 {
   aRealData.ComputeLengthAndData();
   aImagData.ComputeLengthAndData();
 
   if (aRealData.Length() != aImagData.Length() ||
       aRealData.Length() == 0) {
     aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);

--- a/dom/media/webaudio/AudioContext.h
+++ b/dom/media/webaudio/AudioContext.h
@@ -63,16 +63,17 @@ class GlobalObject;
 class MediaStreamAudioDestinationNode;
 class MediaStreamAudioSourceNode;
 class OscillatorNode;
 class PannerNode;
 class ScriptProcessorNode;
 class StereoPannerNode;
 class WaveShaperNode;
 class PeriodicWave;
+class PeriodicWaveConstraints;
 class Promise;
 enum class OscillatorType : uint32_t;
 
 // This is addrefed by the OscillatorNodeEngine on the main thread
 // and then used from the MSG thread.
 // It can be released either from the graph thread or the main thread.
 class BasicWaveFormCache
 {
@@ -250,16 +251,17 @@ public:
   already_AddRefed<BiquadFilterNode>
   CreateBiquadFilter(ErrorResult& aRv);
 
   already_AddRefed<OscillatorNode>
   CreateOscillator(ErrorResult& aRv);
 
   already_AddRefed<PeriodicWave>
   CreatePeriodicWave(const Float32Array& aRealData, const Float32Array& aImagData,
+                     const PeriodicWaveConstraints& aConstraints,
                      ErrorResult& aRv);
 
   already_AddRefed<Promise>
   DecodeAudioData(const ArrayBuffer& aBuffer,
                   const Optional<OwningNonNull<DecodeSuccessCallback> >& aSuccessCallback,
                   const Optional<OwningNonNull<DecodeErrorCallback> >& aFailureCallback,
                   ErrorResult& aRv);
 

--- a/dom/webidl/AudioContext.webidl
+++ b/dom/webidl/AudioContext.webidl
@@ -14,16 +14,20 @@ callback DecodeSuccessCallback = void (A
 callback DecodeErrorCallback = void ();
 
 enum AudioContextState {
     "suspended",
     "running",
     "closed"
 };
 
+dictionary PeriodicWaveConstraints {
+  boolean disableNormalization = false;
+};
+
 [Constructor,
  Constructor(AudioChannel audioChannelType)]
 interface AudioContext : EventTarget {
 
     readonly attribute AudioDestinationNode destination;
     readonly attribute float sampleRate;
     readonly attribute double currentTime;
     readonly attribute AudioListener listener;
@@ -83,17 +87,17 @@ interface AudioContext : EventTarget {
     ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs = 6);
 
     [NewObject, Throws]
     DynamicsCompressorNode createDynamicsCompressor();
 
     [NewObject, Throws]
     OscillatorNode createOscillator();
     [NewObject, Throws]
-    PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag);
+    PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag, optional PeriodicWaveConstraints constraints);
 
 };
 
 // Mozilla extensions
 partial interface AudioContext {
   // Read AudioChannel.webidl for more information about this attribute.
   [Pref="media.useAudioChannelAPI"]
   readonly attribute AudioChannel mozAudioChannelType;