2 * Copyright (C) 2010 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
29 #ifndef HRTFElevation_h
30 #define HRTFElevation_h
32 #include "platform/audio/HRTFKernel.h"
33 #include "wtf/Noncopyable.h"
34 #include "wtf/OwnPtr.h"
35 #include "wtf/PassOwnPtr.h"
36 #include "wtf/PassRefPtr.h"
37 #include "wtf/RefCounted.h"
38 #include "wtf/RefPtr.h"
39 #include "wtf/text/CString.h"
40 #include "wtf/text/WTFString.h"
44 // HRTFElevation contains all of the HRTFKernels (one left ear and one right ear per azimuth angle) for a particular elevation.
46 class PLATFORM_EXPORT HRTFElevation {
47 WTF_MAKE_NONCOPYABLE(HRTFElevation);
49 // Loads and returns an HRTFElevation with the given HRTF database subject name and elevation from browser (or WebKit.framework) resources.
50 // Normally, there will only be a single HRTF database set, but this API supports the possibility of multiple ones with different names.
51 // Interpolated azimuths will be generated based on InterpolationFactor.
52 // Valid values for elevation are -45 -> +90 in 15 degree increments.
53 static PassOwnPtr<HRTFElevation> createForSubject(const String& subjectName, int elevation, float sampleRate);
55 // Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFElevation.
56 static PassOwnPtr<HRTFElevation> createByInterpolatingSlices(HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x, float sampleRate);
58 // Returns the list of left or right ear HRTFKernels for all the azimuths going from 0 to 360 degrees.
59 HRTFKernelList* kernelListL() { return m_kernelListL.get(); }
60 HRTFKernelList* kernelListR() { return m_kernelListR.get(); }
62 double elevationAngle() const { return m_elevationAngle; }
63 unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; }
64 float sampleRate() const { return m_sampleRate; }
66 // Returns the left and right kernels for the given azimuth index.
67 // The interpolated delays based on azimuthBlend: 0 -> 1 are returned in frameDelayL and frameDelayR.
68 void getKernelsFromAzimuth(double azimuthBlend, unsigned azimuthIndex, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR);
70 // Spacing, in degrees, between every azimuth loaded from resource.
71 static const unsigned AzimuthSpacing;
73 // Number of azimuths loaded from resource.
74 static const unsigned NumberOfRawAzimuths;
76 // Interpolates by this factor to get the total number of azimuths from every azimuth loaded from resource.
77 static const unsigned InterpolationFactor;
79 // Total number of azimuths after interpolation.
80 static const unsigned NumberOfTotalAzimuths;
82 // Given a specific azimuth and elevation angle, returns the left and right HRTFKernel.
83 // Valid values for azimuth are 0 -> 345 in 15 degree increments.
84 // Valid values for elevation are -45 -> +90 in 15 degree increments.
85 // Returns true on success.
86 static bool calculateKernelsForAzimuthElevation(int azimuth, int elevation, float sampleRate, const String& subjectName,
87 RefPtr<HRTFKernel>& kernelL, RefPtr<HRTFKernel>& kernelR);
90 HRTFElevation(PassOwnPtr<HRTFKernelList> kernelListL, PassOwnPtr<HRTFKernelList> kernelListR, int elevation, float sampleRate)
91 : m_kernelListL(kernelListL)
92 , m_kernelListR(kernelListR)
93 , m_elevationAngle(elevation)
94 , m_sampleRate(sampleRate)
98 OwnPtr<HRTFKernelList> m_kernelListL;
99 OwnPtr<HRTFKernelList> m_kernelListR;
100 double m_elevationAngle;
106 #endif // HRTFElevation_h