content/media/webaudio/blink/DynamicsCompressorKernel.h@6474c204b198 (annotated)
content/media/webaudio/blink/DynamicsCompressorKernel.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| 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 DynamicsCompressorKernel_h |
| michael@0 | 30 | #define DynamicsCompressorKernel_h |
| michael@0 | 31 | |
| michael@0 | 32 | #include "nsTArray.h" |
| michael@0 | 33 | #include "nsAutoPtr.h" |
| michael@0 | 34 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 35 | |
| michael@0 | 36 | namespace WebCore { |
| michael@0 | 37 | |
| michael@0 | 38 | class DynamicsCompressorKernel { |
| michael@0 | 39 | public: |
| michael@0 | 40 | DynamicsCompressorKernel(float sampleRate, unsigned numberOfChannels); |
| michael@0 | 41 | |
| michael@0 | 42 | void setNumberOfChannels(unsigned); |
| michael@0 | 43 | |
| michael@0 | 44 | // Performs stereo-linked compression. |
| michael@0 | 45 | void process(float* sourceChannels[], |
| michael@0 | 46 | float* destinationChannels[], |
| michael@0 | 47 | unsigned numberOfChannels, |
| michael@0 | 48 | unsigned framesToProcess, |
| michael@0 | 49 | |
| michael@0 | 50 | float dbThreshold, |
| michael@0 | 51 | float dbKnee, |
| michael@0 | 52 | float ratio, |
| michael@0 | 53 | float attackTime, |
| michael@0 | 54 | float releaseTime, |
| michael@0 | 55 | float preDelayTime, |
| michael@0 | 56 | float dbPostGain, |
| michael@0 | 57 | float effectBlend, |
| michael@0 | 58 | |
| michael@0 | 59 | float releaseZone1, |
| michael@0 | 60 | float releaseZone2, |
| michael@0 | 61 | float releaseZone3, |
| michael@0 | 62 | float releaseZone4 |
| michael@0 | 63 | ); |
| michael@0 | 64 | |
| michael@0 | 65 | void reset(); |
| michael@0 | 66 | |
| michael@0 | 67 | unsigned latencyFrames() const { return m_lastPreDelayFrames; } |
| michael@0 | 68 | |
| michael@0 | 69 | float sampleRate() const { return m_sampleRate; } |
| michael@0 | 70 | |
| michael@0 | 71 | float meteringGain() const { return m_meteringGain; } |
| michael@0 | 72 | |
| michael@0 | 73 | size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; |
| michael@0 | 74 | |
| michael@0 | 75 | protected: |
| michael@0 | 76 | float m_sampleRate; |
| michael@0 | 77 | |
| michael@0 | 78 | float m_detectorAverage; |
| michael@0 | 79 | float m_compressorGain; |
| michael@0 | 80 | |
| michael@0 | 81 | // Metering |
| michael@0 | 82 | float m_meteringReleaseK; |
| michael@0 | 83 | float m_meteringGain; |
| michael@0 | 84 | |
| michael@0 | 85 | // Lookahead section. |
| michael@0 | 86 | enum { MaxPreDelayFrames = 1024 }; |
| michael@0 | 87 | enum { MaxPreDelayFramesMask = MaxPreDelayFrames - 1 }; |
| michael@0 | 88 | enum { DefaultPreDelayFrames = 256 }; // setPreDelayTime() will override this initial value |
| michael@0 | 89 | unsigned m_lastPreDelayFrames; |
| michael@0 | 90 | void setPreDelayTime(float); |
| michael@0 | 91 | |
| michael@0 | 92 | nsTArray<nsAutoArrayPtr<float> > m_preDelayBuffers; |
| michael@0 | 93 | int m_preDelayReadIndex; |
| michael@0 | 94 | int m_preDelayWriteIndex; |
| michael@0 | 95 | |
| michael@0 | 96 | float m_maxAttackCompressionDiffDb; |
| michael@0 | 97 | |
| michael@0 | 98 | // Static compression curve. |
| michael@0 | 99 | float kneeCurve(float x, float k); |
| michael@0 | 100 | float saturate(float x, float k); |
| michael@0 | 101 | float slopeAt(float x, float k); |
| michael@0 | 102 | float kAtSlope(float desiredSlope); |
| michael@0 | 103 | |
| michael@0 | 104 | float updateStaticCurveParameters(float dbThreshold, float dbKnee, float ratio); |
| michael@0 | 105 | |
| michael@0 | 106 | // Amount of input change in dB required for 1 dB of output change. |
| michael@0 | 107 | // This applies to the portion of the curve above m_kneeThresholdDb (see below). |
| michael@0 | 108 | float m_ratio; |
| michael@0 | 109 | float m_slope; // Inverse ratio. |
| michael@0 | 110 | |
| michael@0 | 111 | // The input to output change below the threshold is linear 1:1. |
| michael@0 | 112 | float m_linearThreshold; |
| michael@0 | 113 | float m_dbThreshold; |
| michael@0 | 114 | |
| michael@0 | 115 | // m_dbKnee is the number of dB above the threshold before we enter the "ratio" portion of the curve. |
| michael@0 | 116 | // m_kneeThresholdDb = m_dbThreshold + m_dbKnee |
| michael@0 | 117 | // The portion between m_dbThreshold and m_kneeThresholdDb is the "soft knee" portion of the curve |
| michael@0 | 118 | // which transitions smoothly from the linear portion to the ratio portion. |
| michael@0 | 119 | float m_dbKnee; |
| michael@0 | 120 | float m_kneeThreshold; |
| michael@0 | 121 | float m_kneeThresholdDb; |
| michael@0 | 122 | float m_ykneeThresholdDb; |
| michael@0 | 123 | |
| michael@0 | 124 | // Internal parameter for the knee portion of the curve. |
| michael@0 | 125 | float m_K; |
| michael@0 | 126 | }; |
| michael@0 | 127 | |
| michael@0 | 128 | } // namespace WebCore |
| michael@0 | 129 | |
| michael@0 | 130 | #endif // DynamicsCompressorKernel_h |
