The Tor Browser / file comparison
comparison: content/media/webaudio/blink/HRTFDatabase.cpp
content/media/webaudio/blink/HRTFDatabase.cpp
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:c9cc2f547df6 |
|---|---|
| 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 nsReturnRef<HRTFDatabase> HRTFDatabase::create(float sampleRate) | |
| 45 { | |
| 46 return nsReturnRef<HRTFDatabase>(new HRTFDatabase(sampleRate)); | |
| 47 } | |
| 48 | |
| 49 HRTFDatabase::HRTFDatabase(float sampleRate) | |
| 50 : m_sampleRate(sampleRate) | |
| 51 { | |
| 52 m_elevations.SetLength(NumberOfTotalElevations); | |
| 53 | |
| 54 unsigned elevationIndex = 0; | |
| 55 for (int elevation = MinElevation; elevation <= MaxElevation; elevation += RawElevationAngleSpacing) { | |
| 56 nsAutoRef<HRTFElevation> hrtfElevation(HRTFElevation::createBuiltin(elevation, sampleRate)); | |
| 57 MOZ_ASSERT(hrtfElevation.get()); | |
| 58 if (!hrtfElevation.get()) | |
| 59 return; | |
| 60 | |
| 61 m_elevations[elevationIndex] = hrtfElevation.out(); | |
| 62 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 size_t HRTFDatabase::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 83 { | |
| 84 size_t amount = aMallocSizeOf(this); | |
| 85 amount += m_elevations.SizeOfExcludingThis(aMallocSizeOf); | |
| 86 for (size_t i = 0; i < m_elevations.Length(); i++) { | |
| 87 amount += m_elevations[i]->sizeOfIncludingThis(aMallocSizeOf); | |
| 88 } | |
| 89 | |
| 90 return amount; | |
| 91 } | |
| 92 | |
| 93 void HRTFDatabase::getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR, | |
| 94 double& frameDelayL, double& frameDelayR) | |
| 95 { | |
| 96 unsigned elevationIndex = indexFromElevationAngle(elevationAngle); | |
| 97 MOZ_ASSERT(elevationIndex < m_elevations.Length() && m_elevations.Length() > 0); | |
| 98 | |
| 99 if (!m_elevations.Length()) { | |
| 100 kernelL = 0; | |
| 101 kernelR = 0; | |
| 102 return; | |
| 103 } | |
| 104 | |
| 105 if (elevationIndex > m_elevations.Length() - 1) | |
| 106 elevationIndex = m_elevations.Length() - 1; | |
| 107 | |
| 108 HRTFElevation* hrtfElevation = m_elevations[elevationIndex].get(); | |
| 109 MOZ_ASSERT(hrtfElevation); | |
| 110 if (!hrtfElevation) { | |
| 111 kernelL = 0; | |
| 112 kernelR = 0; | |
| 113 return; | |
| 114 } | |
| 115 | |
| 116 hrtfElevation->getKernelsFromAzimuth(azimuthBlend, azimuthIndex, kernelL, kernelR, frameDelayL, frameDelayR); | |
| 117 } | |
| 118 | |
| 119 unsigned HRTFDatabase::indexFromElevationAngle(double elevationAngle) | |
| 120 { | |
| 121 // Clamp to allowed range. | |
| 122 elevationAngle = mozilla::clamped(elevationAngle, | |
| 123 static_cast<double>(MinElevation), | |
| 124 static_cast<double>(MaxElevation)); | |
| 125 | |
| 126 unsigned elevationIndex = static_cast<int>(InterpolationFactor * (elevationAngle - MinElevation) / RawElevationAngleSpacing); | |
| 127 return elevationIndex; | |
| 128 } | |
| 129 | |
| 130 } // namespace WebCore |
