/* * 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. */ #include "HRTFDatabase.h" #include "HRTFElevation.h" using namespace std; namespace WebCore { const int HRTFDatabase::MinElevation = -45; const int HRTFDatabase::MaxElevation = 90; const unsigned HRTFDatabase::RawElevationAngleSpacing = 15; const unsigned HRTFDatabase::NumberOfRawElevations = 10; // -45 -> +90 (each 15 degrees) const unsigned HRTFDatabase::InterpolationFactor = 1; const unsigned HRTFDatabase::NumberOfTotalElevations = NumberOfRawElevations * InterpolationFactor; nsReturnRef<HRTFDatabase> HRTFDatabase::create(float sampleRate) { return nsReturnRef<HRTFDatabase>(new HRTFDatabase(sampleRate)); } HRTFDatabase::HRTFDatabase(float sampleRate) : m_sampleRate(sampleRate) { m_elevations.SetLength(NumberOfTotalElevations); unsigned elevationIndex = 0; for (int elevation = MinElevation; elevation <= MaxElevation; elevation += RawElevationAngleSpacing) { nsAutoRef<HRTFElevation> hrtfElevation(HRTFElevation::createBuiltin(elevation, sampleRate)); MOZ_ASSERT(hrtfElevation.get()); if (!hrtfElevation.get()) return; m_elevations[elevationIndex] = hrtfElevation.out(); elevationIndex += InterpolationFactor; } // Now, go back and interpolate elevations. if (InterpolationFactor > 1) { for (unsigned i = 0; i < NumberOfTotalElevations; i += InterpolationFactor) { unsigned j = (i + InterpolationFactor); if (j >= NumberOfTotalElevations) j = i; // for last elevation interpolate with itself // Create the interpolated convolution kernels and delays. for (unsigned jj = 1; jj < InterpolationFactor; ++jj) { float x = static_cast<float>(jj) / static_cast<float>(InterpolationFactor); m_elevations[i + jj] = HRTFElevation::createByInterpolatingSlices(m_elevations[i].get(), m_elevations[j].get(), x, sampleRate); MOZ_ASSERT(m_elevations[i + jj].get()); } } } } size_t HRTFDatabase::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const { size_t amount = aMallocSizeOf(this); amount += m_elevations.ShallowSizeOfExcludingThis(aMallocSizeOf); for (size_t i = 0; i < m_elevations.Length(); i++) { amount += m_elevations[i]->sizeOfIncludingThis(aMallocSizeOf); } return amount; } void HRTFDatabase::getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR) { unsigned elevationIndex = indexFromElevationAngle(elevationAngle); MOZ_ASSERT(elevationIndex < m_elevations.Length() && m_elevations.Length() > 0); if (!m_elevations.Length()) { kernelL = 0; kernelR = 0; return; } if (elevationIndex > m_elevations.Length() - 1) elevationIndex = m_elevations.Length() - 1; HRTFElevation* hrtfElevation = m_elevations[elevationIndex].get(); MOZ_ASSERT(hrtfElevation); if (!hrtfElevation) { kernelL = 0; kernelR = 0; return; } hrtfElevation->getKernelsFromAzimuth(azimuthBlend, azimuthIndex, kernelL, kernelR, frameDelayL, frameDelayR); } unsigned HRTFDatabase::indexFromElevationAngle(double elevationAngle) { // Clamp to allowed range. elevationAngle = mozilla::clamped(elevationAngle, static_cast<double>(MinElevation), static_cast<double>(MaxElevation)); unsigned elevationIndex = static_cast<int>(InterpolationFactor * (elevationAngle - MinElevation) / RawElevationAngleSpacing); return elevationIndex; } } // namespace WebCore