AnalyserNode.h - mozsearch

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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::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 mozilla::dom

#endif