The Tor Browser: content/media/webaudio/AnalyserNode.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef AnalyserNode_h_

     8 #define AnalyserNode_h_

    10 #include "AudioNode.h"

    11 #include "FFTBlock.h"

    13 namespace mozilla {

    14 namespace dom {

    16 class AudioContext;

    18 class AnalyserNode : public AudioNode

    19 {

    20 public:

    21   explicit AnalyserNode(AudioContext* aContext);

    23   NS_DECL_ISUPPORTS_INHERITED

    25   virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;

    27   void GetFloatFrequencyData(const Float32Array& aArray);

    28   void GetByteFrequencyData(const Uint8Array& aArray);

    29   void GetFloatTimeDomainData(const Float32Array& aArray);

    30   void GetByteTimeDomainData(const Uint8Array& aArray);

    31   uint32_t FftSize() const

    32   {

    33     return mAnalysisBlock.FFTSize();

    34   }

    35   void SetFftSize(uint32_t aValue, ErrorResult& aRv);

    36   uint32_t FrequencyBinCount() const

    37   {

    38     return FftSize() / 2;

    39   }

    40   double MinDecibels() const

    41   {

    42     return mMinDecibels;

    43   }

    44   void SetMinDecibels(double aValue, ErrorResult& aRv);

    45   double MaxDecibels() const

    46   {

    47     return mMaxDecibels;

    48   }

    49   void SetMaxDecibels(double aValue, ErrorResult& aRv);

    50   double SmoothingTimeConstant() const

    51   {

    52     return mSmoothingTimeConstant;

    53   }

    54   void SetSmoothingTimeConstant(double aValue, ErrorResult& aRv);

    56   virtual const char* NodeType() const

    57   {

    58     return "AnalyserNode";

    59   }

    61   virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;

    62   virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;

    64 private:

    65   friend class AnalyserNodeEngine;

    66   void AppendChunk(const AudioChunk& aChunk);

    67   bool AllocateBuffer();

    68   bool FFTAnalysis();

    69   void ApplyBlackmanWindow(float* aBuffer, uint32_t aSize);

    71 private:

    72   FFTBlock mAnalysisBlock;

    73   double mMinDecibels;

    74   double mMaxDecibels;

    75   double mSmoothingTimeConstant;

    76   uint32_t mWriteIndex;

    77   FallibleTArray<float> mBuffer;

    78   FallibleTArray<float> mOutputBuffer;

    79 };

    81 }

    82 }

    84 #endif

The Tor Browser / file revision