mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-07 04:05:49 +00:00
131 lines
5.3 KiB
C++
131 lines
5.3 KiB
C++
/*
|
|
* 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.SizeOfExcludingThis(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
|