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Viewing changes to Source/WebCore/platform/audio/HRTFDatabase.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/WebCore/platform/audio/HRTFDatabase.cpp
 
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/*
 
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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 "config.h"
 
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#if ENABLE(WEB_AUDIO)
 
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#include "HRTFDatabase.h"
 
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#include "HRTFElevation.h"
 
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#include "PlatformMemoryInstrumentation.h"
 
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#include <wtf/MemoryInstrumentationVector.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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PassOwnPtr<HRTFDatabase> HRTFDatabase::create(float sampleRate)
 
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{
 
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    OwnPtr<HRTFDatabase> hrtfDatabase = adoptPtr(new HRTFDatabase(sampleRate));
 
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    return hrtfDatabase.release();
 
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}
 
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HRTFDatabase::HRTFDatabase(float sampleRate)
 
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    : m_elevations(NumberOfTotalElevations)
 
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    , m_sampleRate(sampleRate)
 
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{
 
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    unsigned elevationIndex = 0;
 
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    for (int elevation = MinElevation; elevation <= MaxElevation; elevation += RawElevationAngleSpacing) {
 
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        OwnPtr<HRTFElevation> hrtfElevation = HRTFElevation::createForSubject("Composite", elevation, sampleRate);
 
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        ASSERT(hrtfElevation.get());
 
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        if (!hrtfElevation.get())
 
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            return;
 
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        m_elevations[elevationIndex] = hrtfElevation.release();
 
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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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                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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    ASSERT(elevationIndex < m_elevations.size() && m_elevations.size() > 0);
 
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    if (!m_elevations.size()) {
 
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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.size() - 1)
 
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        elevationIndex = m_elevations.size() - 1;    
 
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    HRTFElevation* hrtfElevation = m_elevations[elevationIndex].get();
 
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    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 = max(static_cast<double>(MinElevation), elevationAngle);
 
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    elevationAngle = min(static_cast<double>(MaxElevation), elevationAngle);
 
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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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void HRTFDatabase::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 
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{
 
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    MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::AudioSharedData);
 
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    info.addMember(m_elevations);
 
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}
 
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} // namespace WebCore
 
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#endif // ENABLE(WEB_AUDIO)