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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
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* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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* 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
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_DATABASE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_DATABASE_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/audio/hrtf_elevation.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class HRTFKernel;
class PLATFORM_EXPORT HRTFDatabase {
USING_FAST_MALLOC(HRTFDatabase);
public:
explicit HRTFDatabase(float sample_rate);
// getKernelsFromAzimuthElevation() returns a left and right ear kernel, and
// an interpolated left and right frame delay for the given azimuth and
// elevation.
// azimuthBlend must be in the range 0 -> 1.
// Valid values for azimuthIndex are
// 0 -> HRTFElevation::NumberOfTotalAzimuths - 1
// (corresponding to angles of 0 -> 360).
// Valid values for elevationAngle are MinElevation -> MaxElevation.
void GetKernelsFromAzimuthElevation(double azimuth_blend,
unsigned azimuth_index,
double elevation_angle,
HRTFKernel*& kernel_l,
HRTFKernel*& kernel_r,
double& frame_delay_l,
double& frame_delay_r);
// Returns the number of different azimuth angles.
static unsigned NumberOfAzimuths() {
return HRTFElevation::kNumberOfTotalAzimuths;
}
float SampleRate() const { return sample_rate_; }
// Number of elevations loaded from resource.
static const unsigned kNumberOfRawElevations;
private:
// Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
static const int kMinElevation;
static const int kMaxElevation;
static const unsigned kRawElevationAngleSpacing;
// Interpolates by this factor to get the total number of elevations from
// every elevation loaded from resource.
static const unsigned kInterpolationFactor;
// Total number of elevations after interpolation.
static const unsigned kNumberOfTotalElevations;
// Returns the index for the correct HRTFElevation given the elevation angle.
static unsigned IndexFromElevationAngle(double);
Vector<std::unique_ptr<HRTFElevation>> elevations_;
float sample_rate_;
DISALLOW_COPY_AND_ASSIGN(HRTFDatabase);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_DATABASE_H_