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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
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