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