mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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120 lines
5.0 KiB
C++
120 lines
5.0 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "HRTFDatabase.h"
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#include "HRTFElevation.h"
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using namespace std;
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namespace WebCore {
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const int HRTFDatabase::MinElevation = -45;
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const int HRTFDatabase::MaxElevation = 90;
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const unsigned HRTFDatabase::RawElevationAngleSpacing = 15;
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const unsigned HRTFDatabase::NumberOfRawElevations = 10; // -45 -> +90 (each 15 degrees)
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const unsigned HRTFDatabase::InterpolationFactor = 1;
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const unsigned HRTFDatabase::NumberOfTotalElevations = NumberOfRawElevations * InterpolationFactor;
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nsReturnRef<HRTFDatabase> HRTFDatabase::create(float sampleRate)
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{
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return nsReturnRef<HRTFDatabase>(new HRTFDatabase(sampleRate));
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}
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HRTFDatabase::HRTFDatabase(float sampleRate)
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: m_sampleRate(sampleRate)
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{
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m_elevations.SetLength(NumberOfTotalElevations);
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unsigned elevationIndex = 0;
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for (int elevation = MinElevation; elevation <= MaxElevation; elevation += RawElevationAngleSpacing) {
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nsAutoRef<HRTFElevation> hrtfElevation(HRTFElevation::createBuiltin(elevation, sampleRate));
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MOZ_ASSERT(hrtfElevation.get());
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if (!hrtfElevation.get())
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return;
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m_elevations[elevationIndex] = hrtfElevation.out();
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elevationIndex += InterpolationFactor;
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}
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// Now, go back and interpolate elevations.
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if (InterpolationFactor > 1) {
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for (unsigned i = 0; i < NumberOfTotalElevations; i += InterpolationFactor) {
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unsigned j = (i + InterpolationFactor);
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if (j >= NumberOfTotalElevations)
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j = i; // for last elevation interpolate with itself
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// Create the interpolated convolution kernels and delays.
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for (unsigned jj = 1; jj < InterpolationFactor; ++jj) {
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float x = static_cast<float>(jj) / static_cast<float>(InterpolationFactor);
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m_elevations[i + jj] = HRTFElevation::createByInterpolatingSlices(m_elevations[i].get(), m_elevations[j].get(), x, sampleRate);
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MOZ_ASSERT(m_elevations[i + jj].get());
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}
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}
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}
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}
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void HRTFDatabase::getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR,
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double& frameDelayL, double& frameDelayR)
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{
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unsigned elevationIndex = indexFromElevationAngle(elevationAngle);
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MOZ_ASSERT(elevationIndex < m_elevations.Length() && m_elevations.Length() > 0);
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if (!m_elevations.Length()) {
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kernelL = 0;
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kernelR = 0;
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return;
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}
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if (elevationIndex > m_elevations.Length() - 1)
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elevationIndex = m_elevations.Length() - 1;
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HRTFElevation* hrtfElevation = m_elevations[elevationIndex].get();
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MOZ_ASSERT(hrtfElevation);
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if (!hrtfElevation) {
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kernelL = 0;
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kernelR = 0;
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return;
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}
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hrtfElevation->getKernelsFromAzimuth(azimuthBlend, azimuthIndex, kernelL, kernelR, frameDelayL, frameDelayR);
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}
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unsigned HRTFDatabase::indexFromElevationAngle(double elevationAngle)
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{
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// Clamp to allowed range.
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elevationAngle = mozilla::clamped(elevationAngle,
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static_cast<double>(MinElevation),
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static_cast<double>(MaxElevation));
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unsigned elevationIndex = static_cast<int>(InterpolationFactor * (elevationAngle - MinElevation) / RawElevationAngleSpacing);
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return elevationIndex;
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}
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} // namespace WebCore
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