Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 87 insertions, 0 deletions

diff --git a/Source/WebCore/platform/audio/HRTFDatabase.h b/Source/WebCore/platform/audio/HRTFDatabase.h
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+++ b/Source/WebCore/platform/audio/HRTFDatabase.h
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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
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef HRTFDatabase_h
+#define HRTFDatabase_h
+
+#include "HRTFElevation.h"
+#include <wtf/HashMap.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/Vector.h>
+#include <wtf/text/CString.h>
+#include <wtf/text/StringHash.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class HRTFKernel;
+
+class HRTFDatabase : public Noncopyable {
+public:
+    static PassOwnPtr<HRTFDatabase> create(double 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; }
+
+    double sampleRate() const { return m_sampleRate; }
+    
+private:
+    explicit HRTFDatabase(double sampleRate);
+
+    // Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
+    static const int MinElevation;
+    static const int MaxElevation;
+    static const unsigned RawElevationAngleSpacing;
+    
+    // Number of elevations loaded from resource.
+    static const unsigned NumberOfRawElevations;
+
+    // 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);
+
+    Vector<OwnPtr<HRTFElevation> > m_elevations;                                            
+    double m_sampleRate;
+};
+
+} // namespace WebCore
+
+#endif // HRTFDatabase_h