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+/* -*- 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
+