third_party/blink/renderer/platform/audio/hrtf_database.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 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
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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 "third_party/blink/renderer/platform/audio/hrtf_elevation.h"
#include "third_party/blink/renderer/platform/wtf/allocator/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 HRTFDatabase final {
  USING_FAST_MALLOC(HRTFDatabase);

 public:
  explicit HRTFDatabase(float sample_rate);
  HRTFDatabase(const HRTFDatabase&) = delete;
  HRTFDatabase& operator=(const HRTFDatabase&) = delete;

  // Returns the number of different azimuth angles.
  static unsigned NumberOfAzimuths();

  // Returns the number of elevations loaded from resource.
  static unsigned NumberOfRawElevations();

  // 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) const;

 private:
  Vector<std::unique_ptr<HRTFElevation>> elevations_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_DATABASE_H_