1 files changed, 90 insertions, 0 deletions
diff --git a/dom/media/webaudio/AnalyserNode.h b/dom/media/webaudio/AnalyserNode.h
new file mode 100644
index 000000000..7fca5df6f
--- /dev/null
+++ b/dom/media/webaudio/AnalyserNode.h
@@ -0,0 +1,90 @@
+/* -*- 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 AnalyserNode_h_
+#define AnalyserNode_h_
+
+#include "AudioNode.h"
+#include "FFTBlock.h"
+#include "AlignedTArray.h"
+
+namespace mozilla {
+namespace dom {
+
+class AudioContext;
+
+class AnalyserNode final : public AudioNode
+{
+public:
+  explicit AnalyserNode(AudioContext* aContext);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetFloatFrequencyData(const Float32Array& aArray);
+  void GetByteFrequencyData(const Uint8Array& aArray);
+  void GetFloatTimeDomainData(const Float32Array& aArray);
+  void GetByteTimeDomainData(const Uint8Array& aArray);
+  uint32_t FftSize() const
+  {
+    return mAnalysisBlock.FFTSize();
+  }
+  void SetFftSize(uint32_t aValue, ErrorResult& aRv);
+  uint32_t FrequencyBinCount() const
+  {
+    return FftSize() / 2;
+  }
+  double MinDecibels() const
+  {
+    return mMinDecibels;
+  }
+  void SetMinDecibels(double aValue, ErrorResult& aRv);
+  double MaxDecibels() const
+  {
+    return mMaxDecibels;
+  }
+  void SetMaxDecibels(double aValue, ErrorResult& aRv);
+  double SmoothingTimeConstant() const
+  {
+    return mSmoothingTimeConstant;
+  }
+  void SetSmoothingTimeConstant(double aValue, ErrorResult& aRv);
+
+  virtual const char* NodeType() const override
+  {
+    return "AnalyserNode";
+  }
+
+  virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
+  virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;
+
+protected:
+  ~AnalyserNode() {}
+
+private:
+  friend class AnalyserNodeEngine;
+  void AppendChunk(const AudioChunk& aChunk);
+  bool AllocateBuffer();
+  bool FFTAnalysis();
+  void ApplyBlackmanWindow(float* aBuffer, uint32_t aSize);
+  void GetTimeDomainData(float* aData, size_t aLength);
+
+private:
+  FFTBlock mAnalysisBlock;
+  nsTArray<AudioChunk> mChunks;
+  double mMinDecibels;
+  double mMaxDecibels;
+  double mSmoothingTimeConstant;
+  size_t mCurrentChunk = 0;
+  AlignedTArray<float> mOutputBuffer;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif
+