Support multiple HRTFDatabases for different sample-rates

Source/core/platform/audio/HRTFPanner.h

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 #ifndef HRTFPanner_h
 #define HRTFPanner_h
 
 #include "core/platform/audio/FFTConvolver.h"
+#include "core/platform/audio/HRTFDatabaseLoader.h"
 #include "core/platform/audio/Panner.h"
 #include "modules/webaudio/DelayDSPKernel.h"
 
 namespace WebCore {
 
 class HRTFPanner : public Panner {
 public:
-    explicit HRTFPanner(float sampleRate);
+    HRTFPanner(float sampleRate, HRTFDatabaseLoader*);
     virtual ~HRTFPanner();
 
     // Panner
     virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess);
     virtual void reset();
 
     size_t fftSize() const { return fftSizeForSampleRate(m_sampleRate); }
     static size_t fftSizeForSampleRate(float sampleRate);
 
     float sampleRate() const { return m_sampleRate; }
 
     virtual double tailTime() const OVERRIDE;
     virtual double latencyTime() const OVERRIDE;
 
 private:
     // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,
     // and azimuthBlend which is an interpolation value from 0 -> 1.
     int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);
 
+    RefPtr<HRTFDatabaseLoader> m_databaseLoader;
+
     float m_sampleRate;
 
     // We maintain two sets of convolvers for smooth cross-faded interpolations when
     // then azimuth and elevation are dynamically changing.
     // When the azimuth and elevation are not changing, we simply process with one of the two sets.
     // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m_convolverR1.
     // Whenever the azimuth or elevation changes, a crossfade is initiated to transition
     // to the new position. So if we're currently processing with CrossfadeSelection1, then
     // we transition to CrossfadeSelection2 (and vice versa).
     // If we're in the middle of a transition, then we wait until it is complete before
@@ skipping 31 matching lines @@
 
     AudioFloatArray m_tempL1;
     AudioFloatArray m_tempR1;
     AudioFloatArray m_tempL2;
     AudioFloatArray m_tempR2;
 };
 
 } // namespace WebCore
 
 #endif // HRTFPanner_h