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 : #include "HRTFDatabase.h"
30 :
31 : #include "HRTFElevation.h"
32 :
33 : using namespace std;
34 :
35 : namespace WebCore {
36 :
37 : const int HRTFDatabase::MinElevation = -45;
38 : const int HRTFDatabase::MaxElevation = 90;
39 : const unsigned HRTFDatabase::RawElevationAngleSpacing = 15;
40 : const unsigned HRTFDatabase::NumberOfRawElevations = 10; // -45 -> +90 (each 15 degrees)
41 : const unsigned HRTFDatabase::InterpolationFactor = 1;
42 : const unsigned HRTFDatabase::NumberOfTotalElevations = NumberOfRawElevations * InterpolationFactor;
43 :
44 0 : nsReturnRef<HRTFDatabase> HRTFDatabase::create(float sampleRate)
45 : {
46 0 : return nsReturnRef<HRTFDatabase>(new HRTFDatabase(sampleRate));
47 : }
48 :
49 0 : HRTFDatabase::HRTFDatabase(float sampleRate)
50 0 : : m_sampleRate(sampleRate)
51 : {
52 0 : m_elevations.SetLength(NumberOfTotalElevations);
53 :
54 0 : unsigned elevationIndex = 0;
55 0 : for (int elevation = MinElevation; elevation <= MaxElevation; elevation += RawElevationAngleSpacing) {
56 0 : nsAutoRef<HRTFElevation> hrtfElevation(HRTFElevation::createBuiltin(elevation, sampleRate));
57 0 : MOZ_ASSERT(hrtfElevation.get());
58 0 : if (!hrtfElevation.get())
59 0 : return;
60 :
61 0 : m_elevations[elevationIndex] = hrtfElevation.out();
62 0 : elevationIndex += InterpolationFactor;
63 : }
64 :
65 : // Now, go back and interpolate elevations.
66 : if (InterpolationFactor > 1) {
67 : for (unsigned i = 0; i < NumberOfTotalElevations; i += InterpolationFactor) {
68 : unsigned j = (i + InterpolationFactor);
69 : if (j >= NumberOfTotalElevations)
70 : j = i; // for last elevation interpolate with itself
71 :
72 : // Create the interpolated convolution kernels and delays.
73 : for (unsigned jj = 1; jj < InterpolationFactor; ++jj) {
74 : float x = static_cast<float>(jj) / static_cast<float>(InterpolationFactor);
75 : m_elevations[i + jj] = HRTFElevation::createByInterpolatingSlices(m_elevations[i].get(), m_elevations[j].get(), x, sampleRate);
76 : MOZ_ASSERT(m_elevations[i + jj].get());
77 : }
78 : }
79 : }
80 : }
81 :
82 0 : size_t HRTFDatabase::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
83 : {
84 0 : size_t amount = aMallocSizeOf(this);
85 0 : amount += m_elevations.ShallowSizeOfExcludingThis(aMallocSizeOf);
86 0 : for (size_t i = 0; i < m_elevations.Length(); i++) {
87 0 : amount += m_elevations[i]->sizeOfIncludingThis(aMallocSizeOf);
88 : }
89 :
90 0 : return amount;
91 : }
92 :
93 0 : void HRTFDatabase::getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR,
94 : double& frameDelayL, double& frameDelayR)
95 : {
96 0 : unsigned elevationIndex = indexFromElevationAngle(elevationAngle);
97 0 : MOZ_ASSERT(elevationIndex < m_elevations.Length() && m_elevations.Length() > 0);
98 :
99 0 : if (!m_elevations.Length()) {
100 0 : kernelL = 0;
101 0 : kernelR = 0;
102 0 : return;
103 : }
104 :
105 0 : if (elevationIndex > m_elevations.Length() - 1)
106 0 : elevationIndex = m_elevations.Length() - 1;
107 :
108 0 : HRTFElevation* hrtfElevation = m_elevations[elevationIndex].get();
109 0 : MOZ_ASSERT(hrtfElevation);
110 0 : if (!hrtfElevation) {
111 0 : kernelL = 0;
112 0 : kernelR = 0;
113 0 : return;
114 : }
115 :
116 0 : hrtfElevation->getKernelsFromAzimuth(azimuthBlend, azimuthIndex, kernelL, kernelR, frameDelayL, frameDelayR);
117 : }
118 :
119 0 : unsigned HRTFDatabase::indexFromElevationAngle(double elevationAngle)
120 : {
121 : // Clamp to allowed range.
122 0 : elevationAngle = mozilla::clamped(elevationAngle,
123 0 : static_cast<double>(MinElevation),
124 0 : static_cast<double>(MaxElevation));
125 :
126 0 : unsigned elevationIndex = static_cast<int>(InterpolationFactor * (elevationAngle - MinElevation) / RawElevationAngleSpacing);
127 0 : return elevationIndex;
128 : }
129 :
130 : } // namespace WebCore
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