1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/AnalyserNode.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef AnalyserNode_h_
1.11 +#define AnalyserNode_h_
1.12 +
1.13 +#include "AudioNode.h"
1.14 +#include "FFTBlock.h"
1.15 +
1.16 +namespace mozilla {
1.17 +namespace dom {
1.18 +
1.19 +class AudioContext;
1.20 +
1.21 +class AnalyserNode : public AudioNode
1.22 +{
1.23 +public:
1.24 + explicit AnalyserNode(AudioContext* aContext);
1.25 +
1.26 + NS_DECL_ISUPPORTS_INHERITED
1.27 +
1.28 + virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
1.29 +
1.30 + void GetFloatFrequencyData(const Float32Array& aArray);
1.31 + void GetByteFrequencyData(const Uint8Array& aArray);
1.32 + void GetFloatTimeDomainData(const Float32Array& aArray);
1.33 + void GetByteTimeDomainData(const Uint8Array& aArray);
1.34 + uint32_t FftSize() const
1.35 + {
1.36 + return mAnalysisBlock.FFTSize();
1.37 + }
1.38 + void SetFftSize(uint32_t aValue, ErrorResult& aRv);
1.39 + uint32_t FrequencyBinCount() const
1.40 + {
1.41 + return FftSize() / 2;
1.42 + }
1.43 + double MinDecibels() const
1.44 + {
1.45 + return mMinDecibels;
1.46 + }
1.47 + void SetMinDecibels(double aValue, ErrorResult& aRv);
1.48 + double MaxDecibels() const
1.49 + {
1.50 + return mMaxDecibels;
1.51 + }
1.52 + void SetMaxDecibels(double aValue, ErrorResult& aRv);
1.53 + double SmoothingTimeConstant() const
1.54 + {
1.55 + return mSmoothingTimeConstant;
1.56 + }
1.57 + void SetSmoothingTimeConstant(double aValue, ErrorResult& aRv);
1.58 +
1.59 + virtual const char* NodeType() const
1.60 + {
1.61 + return "AnalyserNode";
1.62 + }
1.63 +
1.64 + virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
1.65 + virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
1.66 +
1.67 +private:
1.68 + friend class AnalyserNodeEngine;
1.69 + void AppendChunk(const AudioChunk& aChunk);
1.70 + bool AllocateBuffer();
1.71 + bool FFTAnalysis();
1.72 + void ApplyBlackmanWindow(float* aBuffer, uint32_t aSize);
1.73 +
1.74 +private:
1.75 + FFTBlock mAnalysisBlock;
1.76 + double mMinDecibels;
1.77 + double mMaxDecibels;
1.78 + double mSmoothingTimeConstant;
1.79 + uint32_t mWriteIndex;
1.80 + FallibleTArray<float> mBuffer;
1.81 + FallibleTArray<float> mOutputBuffer;
1.82 +};
1.83 +
1.84 +}
1.85 +}
1.86 +
1.87 +#endif
1.88 +
