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 /*

  * Copyright (C) 2010 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

  *     notice, this list of conditions and the following disclaimer in the

  *     documentation and/or other materials provided with the distribution.

  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

  *     its contributors may be used to endorse or promote products derived

  *     from this software without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

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 #ifndef HRTFDatabase_h

 #define HRTFDatabase_h

 #include "HRTFElevation.h"

 #include "nsAutoRef.h"

 #include "nsTArray.h"

 #include "mozilla/MemoryReporting.h"

 namespace WebCore {

 class HRTFKernel;

 class HRTFDatabase {

 public:

     static nsReturnRef<HRTFDatabase> create(float sampleRate);

     // getKernelsFromAzimuthElevation() returns a left and right ear kernel, and an interpolated left and right frame delay for the given azimuth and elevation.

     // azimuthBlend must be in the range 0 -> 1.

     // Valid values for azimuthIndex are 0 -> HRTFElevation::NumberOfTotalAzimuths - 1 (corresponding to angles of 0 -> 360).

     // Valid values for elevationAngle are MinElevation -> MaxElevation.

     void getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR);

     // Returns the number of different azimuth angles.

     static unsigned numberOfAzimuths() { return HRTFElevation::NumberOfTotalAzimuths; }

     float sampleRate() const { return m_sampleRate; }

     // Number of elevations loaded from resource.

     static const unsigned NumberOfRawElevations;

     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

 private:

     HRTFDatabase(const HRTFDatabase& other) MOZ_DELETE;

     void operator=(const HRTFDatabase& other) MOZ_DELETE;

     explicit HRTFDatabase(float sampleRate);

     // Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.

     static const int MinElevation;

     static const int MaxElevation;

     static const unsigned RawElevationAngleSpacing;

     // Interpolates by this factor to get the total number of elevations from every elevation loaded from resource.

     static const unsigned InterpolationFactor;

     // Total number of elevations after interpolation.

     static const unsigned NumberOfTotalElevations;

     // Returns the index for the correct HRTFElevation given the elevation angle.

     static unsigned indexFromElevationAngle(double);

     nsTArray<nsAutoRef<HRTFElevation> > m_elevations;

     float m_sampleRate;

 };

 } // namespace WebCore

 template <>

 class nsAutoRefTraits<WebCore::HRTFDatabase> :

     public nsPointerRefTraits<WebCore::HRTFDatabase> {

 public:

     static void Release(WebCore::HRTFDatabase* ptr) { delete(ptr); }

 };

 #endif // HRTFDatabase_h