content/media/webaudio/blink/HRTFPanner.h@44a2da4a2ab2 (annotated)
content/media/webaudio/blink/HRTFPanner.h
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2010, Google Inc. All rights reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | * modification, are permitted provided that the following conditions |
| michael@0 | 6 | * are met: |
| michael@0 | 7 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 8 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 10 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 11 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 12 | * |
| michael@0 | 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| michael@0 | 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| michael@0 | 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| michael@0 | 16 | * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| michael@0 | 17 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 18 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| michael@0 | 19 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| michael@0 | 20 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| michael@0 | 22 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 23 | */ |
| michael@0 | 24 | |
| michael@0 | 25 | #ifndef HRTFPanner_h |
| michael@0 | 26 | #define HRTFPanner_h |
| michael@0 | 27 | |
| michael@0 | 28 | #include "FFTConvolver.h" |
| michael@0 | 29 | #include "DelayBuffer.h" |
| michael@0 | 30 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 31 | |
| michael@0 | 32 | namespace mozilla { |
| michael@0 | 33 | struct AudioChunk; |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | namespace WebCore { |
| michael@0 | 37 | |
| michael@0 | 38 | class HRTFDatabaseLoader; |
| michael@0 | 39 | |
| michael@0 | 40 | using mozilla::AudioChunk; |
| michael@0 | 41 | |
| michael@0 | 42 | class HRTFPanner { |
| michael@0 | 43 | public: |
| michael@0 | 44 | HRTFPanner(float sampleRate, mozilla::TemporaryRef<HRTFDatabaseLoader> databaseLoader); |
| michael@0 | 45 | ~HRTFPanner(); |
| michael@0 | 46 | |
| michael@0 | 47 | // chunk durations must be 128 |
| michael@0 | 48 | void pan(double azimuth, double elevation, const AudioChunk* inputBus, AudioChunk* outputBus); |
| michael@0 | 49 | void reset(); |
| michael@0 | 50 | |
| michael@0 | 51 | size_t fftSize() const { return m_convolverL1.fftSize(); } |
| michael@0 | 52 | |
| michael@0 | 53 | float sampleRate() const { return m_sampleRate; } |
| michael@0 | 54 | |
| michael@0 | 55 | int maxTailFrames() const; |
| michael@0 | 56 | |
| michael@0 | 57 | size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; |
| michael@0 | 58 | |
| michael@0 | 59 | private: |
| michael@0 | 60 | // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database, |
| michael@0 | 61 | // and azimuthBlend which is an interpolation value from 0 -> 1. |
| michael@0 | 62 | int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend); |
| michael@0 | 63 | |
| michael@0 | 64 | mozilla::RefPtr<HRTFDatabaseLoader> m_databaseLoader; |
| michael@0 | 65 | |
| michael@0 | 66 | float m_sampleRate; |
| michael@0 | 67 | |
| michael@0 | 68 | // We maintain two sets of convolvers for smooth cross-faded interpolations when |
| michael@0 | 69 | // then azimuth and elevation are dynamically changing. |
| michael@0 | 70 | // When the azimuth and elevation are not changing, we simply process with one of the two sets. |
| michael@0 | 71 | // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m_convolverR1. |
| michael@0 | 72 | // Whenever the azimuth or elevation changes, a crossfade is initiated to transition |
| michael@0 | 73 | // to the new position. So if we're currently processing with CrossfadeSelection1, then |
| michael@0 | 74 | // we transition to CrossfadeSelection2 (and vice versa). |
| michael@0 | 75 | // If we're in the middle of a transition, then we wait until it is complete before |
| michael@0 | 76 | // initiating a new transition. |
| michael@0 | 77 | |
| michael@0 | 78 | // Selects either the convolver set (m_convolverL1, m_convolverR1) or (m_convolverL2, m_convolverR2). |
| michael@0 | 79 | enum CrossfadeSelection { |
| michael@0 | 80 | CrossfadeSelection1, |
| michael@0 | 81 | CrossfadeSelection2 |
| michael@0 | 82 | }; |
| michael@0 | 83 | |
| michael@0 | 84 | CrossfadeSelection m_crossfadeSelection; |
| michael@0 | 85 | |
| michael@0 | 86 | // azimuth/elevation for CrossfadeSelection1. |
| michael@0 | 87 | int m_azimuthIndex1; |
| michael@0 | 88 | double m_elevation1; |
| michael@0 | 89 | |
| michael@0 | 90 | // azimuth/elevation for CrossfadeSelection2. |
| michael@0 | 91 | int m_azimuthIndex2; |
| michael@0 | 92 | double m_elevation2; |
| michael@0 | 93 | |
| michael@0 | 94 | // A crossfade value 0 <= m_crossfadeX <= 1. |
| michael@0 | 95 | float m_crossfadeX; |
| michael@0 | 96 | |
| michael@0 | 97 | // Per-sample-frame crossfade value increment. |
| michael@0 | 98 | float m_crossfadeIncr; |
| michael@0 | 99 | |
| michael@0 | 100 | FFTConvolver m_convolverL1; |
| michael@0 | 101 | FFTConvolver m_convolverR1; |
| michael@0 | 102 | FFTConvolver m_convolverL2; |
| michael@0 | 103 | FFTConvolver m_convolverR2; |
| michael@0 | 104 | |
| michael@0 | 105 | mozilla::DelayBuffer m_delayLine; |
| michael@0 | 106 | |
| michael@0 | 107 | AudioFloatArray m_tempL1; |
| michael@0 | 108 | AudioFloatArray m_tempR1; |
| michael@0 | 109 | AudioFloatArray m_tempL2; |
| michael@0 | 110 | AudioFloatArray m_tempR2; |
| michael@0 | 111 | }; |
| michael@0 | 112 | |
| michael@0 | 113 | } // namespace WebCore |
| michael@0 | 114 | |
| michael@0 | 115 | #endif // HRTFPanner_h |
