tor-browser

The Tor Browser
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HRTFKernel.h (5221B)

      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 
     29 #ifndef HRTFKernel_h
     30 #define HRTFKernel_h
     31 
     32 #include "mozilla/FFTBlock.h"
     33 #include "mozilla/MemoryReporting.h"
     34 #include "mozilla/UniquePtr.h"
     35 #include "nsAutoRef.h"
     36 #include "nsTArray.h"
     37 
     38 namespace WebCore {
     39 
     40 using mozilla::FFTBlock;
     41 using mozilla::UniquePtr;
     42 
     43 // HRTF stands for Head-Related Transfer Function.
     44 // HRTFKernel is a frequency-domain representation of an impulse-response used
     45 // as part of the spatialized panning system. For a given azimuth / elevation
     46 // angle there will be one HRTFKernel for the left ear transfer function, and
     47 // one for the right ear. The leading delay (average group delay) for each
     48 // impulse response is extracted:
     49 //      m_fftFrame is the frequency-domain representation of the impulse
     50 //                 response with the delay removed
     51 //      m_frameDelay is the leading delay of the original impulse response.
     52 class HRTFKernel {
     53 public:
     54  // Note: this is destructive on the passed in |impulseResponse|.
     55  // The |length| of |impulseResponse| must be a power of two.
     56  // The size of the DFT will be |2 * length|.
     57  static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length,
     58                                        float sampleRate);
     59 
     60  static nsReturnRef<HRTFKernel> create(UniquePtr<FFTBlock> fftFrame,
     61                                        float frameDelay, float sampleRate);
     62 
     63  // Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an
     64  // interpolated HRTFKernel.
     65  static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1,
     66                                                          HRTFKernel* kernel2,
     67                                                          float x);
     68 
     69  FFTBlock* fftFrame() { return m_fftFrame.get(); }
     70 
     71  size_t fftSize() const { return m_fftFrame->FFTSize(); }
     72  float frameDelay() const { return m_frameDelay; }
     73 
     74  float sampleRate() const { return m_sampleRate; }
     75  double nyquist() const { return 0.5 * sampleRate(); }
     76 
     77  size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
     78    size_t amount = aMallocSizeOf(this);
     79    amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf);
     80    return amount;
     81  }
     82 
     83 private:
     84  HRTFKernel(const HRTFKernel& other) = delete;
     85  void operator=(const HRTFKernel& other) = delete;
     86 
     87  // Note: this is destructive on the passed in |impulseResponse|.
     88  HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate);
     89 
     90  HRTFKernel(UniquePtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
     91      : m_fftFrame(std::move(fftFrame)),
     92        m_frameDelay(frameDelay),
     93        m_sampleRate(sampleRate) {}
     94 
     95  UniquePtr<FFTBlock> m_fftFrame;
     96  float m_frameDelay;
     97  float m_sampleRate;
     98 };
     99 
    100 typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList;
    101 
    102 }  // namespace WebCore
    103 
    104 template <>
    105 class nsAutoRefTraits<WebCore::HRTFKernel>
    106    : public nsPointerRefTraits<WebCore::HRTFKernel> {
    107 public:
    108  static void Release(WebCore::HRTFKernel* ptr) { delete (ptr); }
    109 };
    110 
    111 namespace WebCore {
    112 
    113 inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse,
    114                                                  size_t length,
    115                                                  float sampleRate) {
    116  return nsReturnRef<HRTFKernel>(
    117      new HRTFKernel(impulseResponse, length, sampleRate));
    118 }
    119 
    120 inline nsReturnRef<HRTFKernel> HRTFKernel::create(UniquePtr<FFTBlock> fftFrame,
    121                                                  float frameDelay,
    122                                                  float sampleRate) {
    123  return nsReturnRef<HRTFKernel>(
    124      new HRTFKernel(std::move(fftFrame), frameDelay, sampleRate));
    125 }
    126 
    127 }  // namespace WebCore
    128 
    129 #endif  // HRTFKernel_h