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91 lines
2.3 KiB
C++
91 lines
2.3 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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#include "FFTBlock.h"
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#include "AlignedTArray.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 final : public AudioNode
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{
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public:
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explicit AnalyserNode(AudioContext* aContext);
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NS_DECL_ISUPPORTS_INHERITED
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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void GetFloatFrequencyData(const Float32Array& aArray);
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void GetByteFrequencyData(const Uint8Array& aArray);
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void GetFloatTimeDomainData(const Float32Array& aArray);
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void GetByteTimeDomainData(const Uint8Array& aArray);
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uint32_t FftSize() const
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{
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return mAnalysisBlock.FFTSize();
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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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virtual const char* NodeType() const override
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{
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return "AnalyserNode";
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}
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virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
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virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;
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protected:
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~AnalyserNode() {}
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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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void GetTimeDomainData(float* aData, size_t aLength);
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private:
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FFTBlock mAnalysisBlock;
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nsTArray<AudioChunk> mChunks;
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double mMinDecibels;
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double mMaxDecibels;
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double mSmoothingTimeConstant;
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size_t mCurrentChunk = 0;
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AlignedTArray<float> mOutputBuffer;
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};
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} // namespace dom
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} // namespace mozilla
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#endif
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