Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2010 Google Inc. All rights reserved.
       3             :  *
       4             :  * Redistribution and use in source and binary forms, with or without
       5             :  * modification, are permitted provided that the following conditions
       6             :  * are met:
       7             :  *
       8             :  * 1.  Redistributions of source code must retain the above copyright
       9             :  *     notice, this list of conditions and the following disclaimer.
      10             :  * 2.  Redistributions in binary form must reproduce the above copyright
      11             :  *     notice, this list of conditions and the following disclaimer in the
      12             :  *     documentation and/or other materials provided with the distribution.
      13             :  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
      14             :  *     its contributors may be used to endorse or promote products derived
      15             :  *     from this software without specific prior written permission.
      16             :  *
      17             :  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
      18             :  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      19             :  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
      20             :  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
      21             :  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      22             :  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      23             :  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
      24             :  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      25             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      26             :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      27             :  */
      28             : 
      29             : #ifndef HRTFDatabase_h
      30             : #define HRTFDatabase_h
      31             : 
      32             : #include "HRTFElevation.h"
      33             : #include "nsAutoRef.h"
      34             : #include "nsTArray.h"
      35             : #include "mozilla/MemoryReporting.h"
      36             : 
      37             : namespace WebCore {
      38             : 
      39             : class HRTFKernel;
      40             : 
      41           0 : class HRTFDatabase {
      42             : public:
      43             :     static nsReturnRef<HRTFDatabase> create(float sampleRate);
      44             : 
      45             :     // getKernelsFromAzimuthElevation() returns a left and right ear kernel, and an interpolated left and right frame delay for the given azimuth and elevation.
      46             :     // azimuthBlend must be in the range 0 -> 1.
      47             :     // Valid values for azimuthIndex are 0 -> HRTFElevation::NumberOfTotalAzimuths - 1 (corresponding to angles of 0 -> 360).
      48             :     // Valid values for elevationAngle are MinElevation -> MaxElevation.
      49             :     void getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR);
      50             : 
      51             :     // Returns the number of different azimuth angles.
      52           0 :     static unsigned numberOfAzimuths() { return HRTFElevation::NumberOfTotalAzimuths; }
      53             : 
      54             :     float sampleRate() const { return m_sampleRate; }
      55             : 
      56             :     // Number of elevations loaded from resource.
      57             :     static const unsigned NumberOfRawElevations;
      58             : 
      59             :     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
      60             : 
      61             : private:
      62             :     HRTFDatabase(const HRTFDatabase& other) = delete;
      63             :     void operator=(const HRTFDatabase& other) = delete;
      64             : 
      65             :     explicit HRTFDatabase(float sampleRate);
      66             : 
      67             :     // Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
      68             :     static const int MinElevation;
      69             :     static const int MaxElevation;
      70             :     static const unsigned RawElevationAngleSpacing;
      71             : 
      72             :     // Interpolates by this factor to get the total number of elevations from every elevation loaded from resource.
      73             :     static const unsigned InterpolationFactor;
      74             : 
      75             :     // Total number of elevations after interpolation.
      76             :     static const unsigned NumberOfTotalElevations;
      77             : 
      78             :     // Returns the index for the correct HRTFElevation given the elevation angle.
      79             :     static unsigned indexFromElevationAngle(double);
      80             : 
      81             :     nsTArray<nsAutoRef<HRTFElevation> > m_elevations;
      82             :     float m_sampleRate;
      83             : };
      84             : 
      85             : } // namespace WebCore
      86             : 
      87             : template <>
      88           0 : class nsAutoRefTraits<WebCore::HRTFDatabase> :
      89             :     public nsPointerRefTraits<WebCore::HRTFDatabase> {
      90             : public:
      91           0 :     static void Release(WebCore::HRTFDatabase* ptr) { delete(ptr); }
      92             : };
      93             : 
      94             : #endif // HRTFDatabase_h