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/content/media/webaudio/blink/HRTFKernel.h

https://github.com/chardis/gecko-dev
C Header | 118 lines | 58 code | 22 blank | 38 comment | 0 complexity | 26bed2717b87accdd0e721bbb4a55b83 MD5 | raw file
Possible License(s): MPL-2.0, BSD-3-Clause, 0BSD, LGPL-2.1, LGPL-3.0, MPL-2.0-no-copyleft-exception, Apache-2.0, GPL-2.0, JSON
  1. /*
  2. * Copyright (C) 2010 Google Inc. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14. * its contributors may be used to endorse or promote products derived
  15. * from this software without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18. * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19. * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20. * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21. * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22. * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26. * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27. */
  28. #ifndef HRTFKernel_h
  29. #define HRTFKernel_h
  30. #include "nsAutoPtr.h"
  31. #include "nsAutoRef.h"
  32. #include "nsTArray.h"
  33. #include "mozilla/FFTBlock.h"
  34. #include "mozilla/MemoryReporting.h"
  35. namespace WebCore {
  36. using mozilla::FFTBlock;
  37. // HRTF stands for Head-Related Transfer Function.
  38. // HRTFKernel is a frequency-domain representation of an impulse-response used as part of the spatialized panning system.
  39. // For a given azimuth / elevation angle there will be one HRTFKernel for the left ear transfer function, and one for the right ear.
  40. // The leading delay (average group delay) for each impulse response is extracted:
  41. // m_fftFrame is the frequency-domain representation of the impulse response with the delay removed
  42. // m_frameDelay is the leading delay of the original impulse response.
  43. class HRTFKernel {
  44. public:
  45. // Note: this is destructive on the passed in |impulseResponse|.
  46. // The |length| of |impulseResponse| must be a power of two.
  47. // The size of the DFT will be |2 * length|.
  48. static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length, float sampleRate);
  49. static nsReturnRef<HRTFKernel> create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate);
  50. // Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFKernel.
  51. static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1, HRTFKernel* kernel2, float x);
  52. FFTBlock* fftFrame() { return m_fftFrame.get(); }
  53. size_t fftSize() const { return m_fftFrame->FFTSize(); }
  54. float frameDelay() const { return m_frameDelay; }
  55. float sampleRate() const { return m_sampleRate; }
  56. double nyquist() const { return 0.5 * sampleRate(); }
  57. size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
  58. {
  59. size_t amount = aMallocSizeOf(this);
  60. amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf);
  61. return amount;
  62. }
  63. private:
  64. HRTFKernel(const HRTFKernel& other) MOZ_DELETE;
  65. void operator=(const HRTFKernel& other) MOZ_DELETE;
  66. // Note: this is destructive on the passed in |impulseResponse|.
  67. HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate);
  68. HRTFKernel(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
  69. : m_fftFrame(fftFrame)
  70. , m_frameDelay(frameDelay)
  71. , m_sampleRate(sampleRate)
  72. {
  73. }
  74. nsAutoPtr<FFTBlock> m_fftFrame;
  75. float m_frameDelay;
  76. float m_sampleRate;
  77. };
  78. typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList;
  79. } // namespace WebCore
  80. template <>
  81. class nsAutoRefTraits<WebCore::HRTFKernel> :
  82. public nsPointerRefTraits<WebCore::HRTFKernel> {
  83. public:
  84. static void Release(WebCore::HRTFKernel* ptr) { delete(ptr); }
  85. };
  86. namespace WebCore {
  87. inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse, size_t length, float sampleRate)
  88. {
  89. return nsReturnRef<HRTFKernel>(new HRTFKernel(impulseResponse, length, sampleRate));
  90. }
  91. inline nsReturnRef<HRTFKernel> HRTFKernel::create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
  92. {
  93. return nsReturnRef<HRTFKernel>(new HRTFKernel(fftFrame, frameDelay, sampleRate));
  94. }
  95. } // namespace WebCore
  96. #endif // HRTFKernel_h