michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef AnalyserNode_h_
michael@0: #define AnalyserNode_h_
michael@0: 
michael@0: #include "AudioNode.h"
michael@0: #include "FFTBlock.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: class AudioContext;
michael@0: 
michael@0: class AnalyserNode : public AudioNode
michael@0: {
michael@0: public:
michael@0:   explicit AnalyserNode(AudioContext* aContext);
michael@0: 
michael@0:   NS_DECL_ISUPPORTS_INHERITED
michael@0: 
michael@0:   virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
michael@0: 
michael@0:   void GetFloatFrequencyData(const Float32Array& aArray);
michael@0:   void GetByteFrequencyData(const Uint8Array& aArray);
michael@0:   void GetFloatTimeDomainData(const Float32Array& aArray);
michael@0:   void GetByteTimeDomainData(const Uint8Array& aArray);
michael@0:   uint32_t FftSize() const
michael@0:   {
michael@0:     return mAnalysisBlock.FFTSize();
michael@0:   }
michael@0:   void SetFftSize(uint32_t aValue, ErrorResult& aRv);
michael@0:   uint32_t FrequencyBinCount() const
michael@0:   {
michael@0:     return FftSize() / 2;
michael@0:   }
michael@0:   double MinDecibels() const
michael@0:   {
michael@0:     return mMinDecibels;
michael@0:   }
michael@0:   void SetMinDecibels(double aValue, ErrorResult& aRv);
michael@0:   double MaxDecibels() const
michael@0:   {
michael@0:     return mMaxDecibels;
michael@0:   }
michael@0:   void SetMaxDecibels(double aValue, ErrorResult& aRv);
michael@0:   double SmoothingTimeConstant() const
michael@0:   {
michael@0:     return mSmoothingTimeConstant;
michael@0:   }
michael@0:   void SetSmoothingTimeConstant(double aValue, ErrorResult& aRv);
michael@0: 
michael@0:   virtual const char* NodeType() const
michael@0:   {
michael@0:     return "AnalyserNode";
michael@0:   }
michael@0: 
michael@0:   virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
michael@0:   virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:   friend class AnalyserNodeEngine;
michael@0:   void AppendChunk(const AudioChunk& aChunk);
michael@0:   bool AllocateBuffer();
michael@0:   bool FFTAnalysis();
michael@0:   void ApplyBlackmanWindow(float* aBuffer, uint32_t aSize);
michael@0: 
michael@0: private:
michael@0:   FFTBlock mAnalysisBlock;
michael@0:   double mMinDecibels;
michael@0:   double mMaxDecibels;
michael@0:   double mSmoothingTimeConstant;
michael@0:   uint32_t mWriteIndex;
michael@0:   FallibleTArray<float> mBuffer;
michael@0:   FallibleTArray<float> mOutputBuffer;
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif
michael@0: