The Tor Browser / file comparison
comparison: content/media/webaudio/blink/HRTFPanner.h
content/media/webaudio/blink/HRTFPanner.h
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:6cdcf8058076 |
|---|---|
| 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 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
| 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 23 */ | |
| 24 | |
| 25 #ifndef HRTFPanner_h | |
| 26 #define HRTFPanner_h | |
| 27 | |
| 28 #include "FFTConvolver.h" | |
| 29 #include "DelayBuffer.h" | |
| 30 #include "mozilla/MemoryReporting.h" | |
| 31 | |
| 32 namespace mozilla { | |
| 33 struct AudioChunk; | |
| 34 } | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 class HRTFDatabaseLoader; | |
| 39 | |
| 40 using mozilla::AudioChunk; | |
| 41 | |
| 42 class HRTFPanner { | |
| 43 public: | |
| 44 HRTFPanner(float sampleRate, mozilla::TemporaryRef<HRTFDatabaseLoader> databaseLoader); | |
| 45 ~HRTFPanner(); | |
| 46 | |
| 47 // chunk durations must be 128 | |
| 48 void pan(double azimuth, double elevation, const AudioChunk* inputBus, AudioChunk* outputBus); | |
| 49 void reset(); | |
| 50 | |
| 51 size_t fftSize() const { return m_convolverL1.fftSize(); } | |
| 52 | |
| 53 float sampleRate() const { return m_sampleRate; } | |
| 54 | |
| 55 int maxTailFrames() const; | |
| 56 | |
| 57 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 58 | |
| 59 private: | |
| 60 // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database, | |
| 61 // and azimuthBlend which is an interpolation value from 0 -> 1. | |
| 62 int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend); | |
| 63 | |
| 64 mozilla::RefPtr<HRTFDatabaseLoader> m_databaseLoader; | |
| 65 | |
| 66 float m_sampleRate; | |
| 67 | |
| 68 // We maintain two sets of convolvers for smooth cross-faded interpolations when | |
| 69 // then azimuth and elevation are dynamically changing. | |
| 70 // When the azimuth and elevation are not changing, we simply process with one of the two sets. | |
| 71 // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m_convolverR1. | |
| 72 // Whenever the azimuth or elevation changes, a crossfade is initiated to transition | |
| 73 // to the new position. So if we're currently processing with CrossfadeSelection1, then | |
| 74 // we transition to CrossfadeSelection2 (and vice versa). | |
| 75 // If we're in the middle of a transition, then we wait until it is complete before | |
| 76 // initiating a new transition. | |
| 77 | |
| 78 // Selects either the convolver set (m_convolverL1, m_convolverR1) or (m_convolverL2, m_convolverR2). | |
| 79 enum CrossfadeSelection { | |
| 80 CrossfadeSelection1, | |
| 81 CrossfadeSelection2 | |
| 82 }; | |
| 83 | |
| 84 CrossfadeSelection m_crossfadeSelection; | |
| 85 | |
| 86 // azimuth/elevation for CrossfadeSelection1. | |
| 87 int m_azimuthIndex1; | |
| 88 double m_elevation1; | |
| 89 | |
| 90 // azimuth/elevation for CrossfadeSelection2. | |
| 91 int m_azimuthIndex2; | |
| 92 double m_elevation2; | |
| 93 | |
| 94 // A crossfade value 0 <= m_crossfadeX <= 1. | |
| 95 float m_crossfadeX; | |
| 96 | |
| 97 // Per-sample-frame crossfade value increment. | |
| 98 float m_crossfadeIncr; | |
| 99 | |
| 100 FFTConvolver m_convolverL1; | |
| 101 FFTConvolver m_convolverR1; | |
| 102 FFTConvolver m_convolverL2; | |
| 103 FFTConvolver m_convolverR2; | |
| 104 | |
| 105 mozilla::DelayBuffer m_delayLine; | |
| 106 | |
| 107 AudioFloatArray m_tempL1; | |
| 108 AudioFloatArray m_tempR1; | |
| 109 AudioFloatArray m_tempL2; | |
| 110 AudioFloatArray m_tempR2; | |
| 111 }; | |
| 112 | |
| 113 } // namespace WebCore | |
| 114 | |
| 115 #endif // HRTFPanner_h |
