Source code

Revision control

Other Tools

/* -*- 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;
struct AnalyserOptions;
class AnalyserNode final : public AudioNode {
public:
static already_AddRefed<AnalyserNode> Create(AudioContext& aAudioContext,
const AnalyserOptions& aOptions,
ErrorResult& aRv);
NS_INLINE_DECL_REFCOUNTING_INHERITED(AnalyserNode, AudioNode)
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
static already_AddRefed<AnalyserNode> Constructor(
const GlobalObject& aGlobal, AudioContext& aAudioContext,
const AnalyserOptions& aOptions, ErrorResult& aRv) {
return Create(aAudioContext, aOptions, aRv);
}
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;
void SetMinAndMaxDecibels(double aMinValue, double aMaxValue,
ErrorResult& aRv);
private:
~AnalyserNode() = default;
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:
explicit AnalyserNode(AudioContext* aContext);
FFTBlock mAnalysisBlock;
nsTArray<AudioChunk> mChunks;
double mMinDecibels;
double mMaxDecibels;
double mSmoothingTimeConstant;
size_t mCurrentChunk = 0;
AlignedTArray<float> mOutputBuffer;
};
} // namespace dom
} // namespace mozilla
#endif