Allow larger arrays up to size 8192 for PeriodicWave

Source/modules/webaudio/PeriodicWave.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 #include "core/dom/DOMTypedArray.h"
 #include "platform/audio/AudioArray.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class PeriodicWave : public GarbageCollectedFinalized<PeriodicWave>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    // Maximum array size allowed for creating PeriodicWave's.
-    static const unsigned kMaxPeriodicWaveArraySize;
     static PeriodicWave* createSine(float sampleRate);
     static PeriodicWave* createSquare(float sampleRate);
     static PeriodicWave* createSawtooth(float sampleRate);
     static PeriodicWave* createTriangle(float sampleRate);
 
     // Creates an arbitrary periodic wave given the frequency components (Fourier coefficients).
     static PeriodicWave* create(float sampleRate, DOMFloat32Array* real, DOMFloat32Array* imag);
 
     // Returns pointers to the lower and higher wave data for the pitch range containing
     // the given fundamental frequency. These two tables are in adjacent "pitch" ranges
     // where the higher table will have the maximum number of partials which won't alias when played back
     // at this fundamental frequency. The lower wave is the next range containing fewer partials than the higher wave.
     // Interpolation between these two tables can be made according to tableInterpolationFactor.
     // Where values from 0 -> 1 interpolate between lower -> higher.
     void waveDataForFundamentalFrequency(float, float*& lowerWaveData, float*& higherWaveData, float& tableInterpolationFactor);
 
     // Returns the scalar multiplier to the oscillator frequency to calculate wave buffer phase increment.
     float rateScale() const { return m_rateScale; }
 
-    unsigned periodicWaveSize() const { return m_periodicWaveSize; }
+    // The size of the FFT to use based on the sampling rate.
+    unsigned periodicWaveSize() const;
+
+    // The number of ranges needed for the given sampling rate and FFT size.
+    unsigned numberOfRanges() const { return m_numberOfRanges; }
 
     DEFINE_INLINE_TRACE() { }
 
 private:
     explicit PeriodicWave(float sampleRate);
 
     void generateBasicWaveform(int);
 
     float m_sampleRate;
-    unsigned m_periodicWaveSize;
     unsigned m_numberOfRanges;
     float m_centsPerRange;
 
     // The lowest frequency (in Hertz) where playback will include all of the partials.
     // Playing back lower than this frequency will gradually lose more high-frequency information.
     // This frequency is quite low (~10Hz @ 44.1KHz)
     float m_lowestFundamentalFrequency;
 
     float m_rateScale;
 
     // Maximum possible number of partials (before culling).
     unsigned maxNumberOfPartials() const;
 
     unsigned numberOfPartialsForRange(unsigned rangeIndex) const;
 
     // Creates tables based on numberOfComponents Fourier coefficients.
     void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents);
     Vector<OwnPtr<AudioFloatArray>> m_bandLimitedTables;
 };
 
 } // namespace blink
 
 #endif // PeriodicWave_h