content/media/webaudio/blink/DynamicsCompressor.h@b8a032363ba2 (annotated)
content/media/webaudio/blink/DynamicsCompressor.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2011 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 | * |
| michael@0 | 8 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 9 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 11 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 12 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| michael@0 | 14 | * its contributors may be used to endorse or promote products derived |
| michael@0 | 15 | * from this software without specific prior written permission. |
| michael@0 | 16 | * |
| michael@0 | 17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| michael@0 | 18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| michael@0 | 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| michael@0 | 20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| michael@0 | 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| michael@0 | 23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| michael@0 | 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| michael@0 | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 27 | */ |
| michael@0 | 28 | |
| michael@0 | 29 | #ifndef DynamicsCompressor_h |
| michael@0 | 30 | #define DynamicsCompressor_h |
| michael@0 | 31 | |
| michael@0 | 32 | #include "DynamicsCompressorKernel.h" |
| michael@0 | 33 | #include "ZeroPole.h" |
| michael@0 | 34 | |
| michael@0 | 35 | #include "nsTArray.h" |
| michael@0 | 36 | #include "nsAutoPtr.h" |
| michael@0 | 37 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 38 | |
| michael@0 | 39 | namespace mozilla { |
| michael@0 | 40 | struct AudioChunk; |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | namespace WebCore { |
| michael@0 | 44 | |
| michael@0 | 45 | using mozilla::AudioChunk; |
| michael@0 | 46 | |
| michael@0 | 47 | // DynamicsCompressor implements a flexible audio dynamics compression effect such as |
| michael@0 | 48 | // is commonly used in musical production and game audio. It lowers the volume |
| michael@0 | 49 | // of the loudest parts of the signal and raises the volume of the softest parts, |
| michael@0 | 50 | // making the sound richer, fuller, and more controlled. |
| michael@0 | 51 | |
| michael@0 | 52 | class DynamicsCompressor { |
| michael@0 | 53 | public: |
| michael@0 | 54 | enum { |
| michael@0 | 55 | ParamThreshold, |
| michael@0 | 56 | ParamKnee, |
| michael@0 | 57 | ParamRatio, |
| michael@0 | 58 | ParamAttack, |
| michael@0 | 59 | ParamRelease, |
| michael@0 | 60 | ParamPreDelay, |
| michael@0 | 61 | ParamReleaseZone1, |
| michael@0 | 62 | ParamReleaseZone2, |
| michael@0 | 63 | ParamReleaseZone3, |
| michael@0 | 64 | ParamReleaseZone4, |
| michael@0 | 65 | ParamPostGain, |
| michael@0 | 66 | ParamFilterStageGain, |
| michael@0 | 67 | ParamFilterStageRatio, |
| michael@0 | 68 | ParamFilterAnchor, |
| michael@0 | 69 | ParamEffectBlend, |
| michael@0 | 70 | ParamReduction, |
| michael@0 | 71 | ParamLast |
| michael@0 | 72 | }; |
| michael@0 | 73 | |
| michael@0 | 74 | DynamicsCompressor(float sampleRate, unsigned numberOfChannels); |
| michael@0 | 75 | |
| michael@0 | 76 | void process(const AudioChunk* sourceChunk, AudioChunk* destinationChunk, unsigned framesToProcess); |
| michael@0 | 77 | void reset(); |
| michael@0 | 78 | void setNumberOfChannels(unsigned); |
| michael@0 | 79 | unsigned numberOfChannels() const { return m_numberOfChannels; } |
| michael@0 | 80 | |
| michael@0 | 81 | void setParameterValue(unsigned parameterID, float value); |
| michael@0 | 82 | float parameterValue(unsigned parameterID); |
| michael@0 | 83 | |
| michael@0 | 84 | float sampleRate() const { return m_sampleRate; } |
| michael@0 | 85 | float nyquist() const { return m_sampleRate / 2; } |
| michael@0 | 86 | |
| michael@0 | 87 | double tailTime() const { return 0; } |
| michael@0 | 88 | double latencyTime() const { return m_compressor.latencyFrames() / static_cast<double>(sampleRate()); } |
| michael@0 | 89 | |
| michael@0 | 90 | size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; |
| michael@0 | 91 | |
| michael@0 | 92 | protected: |
| michael@0 | 93 | unsigned m_numberOfChannels; |
| michael@0 | 94 | |
| michael@0 | 95 | // m_parameters holds the tweakable compressor parameters. |
| michael@0 | 96 | float m_parameters[ParamLast]; |
| michael@0 | 97 | void initializeParameters(); |
| michael@0 | 98 | |
| michael@0 | 99 | float m_sampleRate; |
| michael@0 | 100 | |
| michael@0 | 101 | // Emphasis filter controls. |
| michael@0 | 102 | float m_lastFilterStageRatio; |
| michael@0 | 103 | float m_lastAnchor; |
| michael@0 | 104 | float m_lastFilterStageGain; |
| michael@0 | 105 | |
| michael@0 | 106 | typedef struct { |
| michael@0 | 107 | ZeroPole filters[4]; |
| michael@0 | 108 | size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const |
| michael@0 | 109 | { |
| michael@0 | 110 | return aMallocSizeOf(this); |
| michael@0 | 111 | } |
| michael@0 | 112 | } ZeroPoleFilterPack4; |
| michael@0 | 113 | |
| michael@0 | 114 | // Per-channel emphasis filters. |
| michael@0 | 115 | nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_preFilterPacks; |
| michael@0 | 116 | nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_postFilterPacks; |
| michael@0 | 117 | |
| michael@0 | 118 | nsAutoArrayPtr<const float*> m_sourceChannels; |
| michael@0 | 119 | nsAutoArrayPtr<float*> m_destinationChannels; |
| michael@0 | 120 | |
| michael@0 | 121 | void setEmphasisStageParameters(unsigned stageIndex, float gain, float normalizedFrequency /* 0 -> 1 */); |
| michael@0 | 122 | void setEmphasisParameters(float gain, float anchorFreq, float filterStageRatio); |
| michael@0 | 123 | |
| michael@0 | 124 | // The core compressor. |
| michael@0 | 125 | DynamicsCompressorKernel m_compressor; |
| michael@0 | 126 | }; |
| michael@0 | 127 | |
| michael@0 | 128 | } // namespace WebCore |
| michael@0 | 129 | |
| michael@0 | 130 | #endif // DynamicsCompressor_h |
