The Tor Browser / file comparison
comparison: content/media/webaudio/blink/DynamicsCompressorKernel.h
content/media/webaudio/blink/DynamicsCompressorKernel.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:195bb86ca740 |
|---|---|
| 1 /* | |
| 2 * Copyright (C) 2011 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 DynamicsCompressorKernel_h | |
| 30 #define DynamicsCompressorKernel_h | |
| 31 | |
| 32 #include "nsTArray.h" | |
| 33 #include "nsAutoPtr.h" | |
| 34 #include "mozilla/MemoryReporting.h" | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 class DynamicsCompressorKernel { | |
| 39 public: | |
| 40 DynamicsCompressorKernel(float sampleRate, unsigned numberOfChannels); | |
| 41 | |
| 42 void setNumberOfChannels(unsigned); | |
| 43 | |
| 44 // Performs stereo-linked compression. | |
| 45 void process(float* sourceChannels[], | |
| 46 float* destinationChannels[], | |
| 47 unsigned numberOfChannels, | |
| 48 unsigned framesToProcess, | |
| 49 | |
| 50 float dbThreshold, | |
| 51 float dbKnee, | |
| 52 float ratio, | |
| 53 float attackTime, | |
| 54 float releaseTime, | |
| 55 float preDelayTime, | |
| 56 float dbPostGain, | |
| 57 float effectBlend, | |
| 58 | |
| 59 float releaseZone1, | |
| 60 float releaseZone2, | |
| 61 float releaseZone3, | |
| 62 float releaseZone4 | |
| 63 ); | |
| 64 | |
| 65 void reset(); | |
| 66 | |
| 67 unsigned latencyFrames() const { return m_lastPreDelayFrames; } | |
| 68 | |
| 69 float sampleRate() const { return m_sampleRate; } | |
| 70 | |
| 71 float meteringGain() const { return m_meteringGain; } | |
| 72 | |
| 73 size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 74 | |
| 75 protected: | |
| 76 float m_sampleRate; | |
| 77 | |
| 78 float m_detectorAverage; | |
| 79 float m_compressorGain; | |
| 80 | |
| 81 // Metering | |
| 82 float m_meteringReleaseK; | |
| 83 float m_meteringGain; | |
| 84 | |
| 85 // Lookahead section. | |
| 86 enum { MaxPreDelayFrames = 1024 }; | |
| 87 enum { MaxPreDelayFramesMask = MaxPreDelayFrames - 1 }; | |
| 88 enum { DefaultPreDelayFrames = 256 }; // setPreDelayTime() will override this initial value | |
| 89 unsigned m_lastPreDelayFrames; | |
| 90 void setPreDelayTime(float); | |
| 91 | |
| 92 nsTArray<nsAutoArrayPtr<float> > m_preDelayBuffers; | |
| 93 int m_preDelayReadIndex; | |
| 94 int m_preDelayWriteIndex; | |
| 95 | |
| 96 float m_maxAttackCompressionDiffDb; | |
| 97 | |
| 98 // Static compression curve. | |
| 99 float kneeCurve(float x, float k); | |
| 100 float saturate(float x, float k); | |
| 101 float slopeAt(float x, float k); | |
| 102 float kAtSlope(float desiredSlope); | |
| 103 | |
| 104 float updateStaticCurveParameters(float dbThreshold, float dbKnee, float ratio); | |
| 105 | |
| 106 // Amount of input change in dB required for 1 dB of output change. | |
| 107 // This applies to the portion of the curve above m_kneeThresholdDb (see below). | |
| 108 float m_ratio; | |
| 109 float m_slope; // Inverse ratio. | |
| 110 | |
| 111 // The input to output change below the threshold is linear 1:1. | |
| 112 float m_linearThreshold; | |
| 113 float m_dbThreshold; | |
| 114 | |
| 115 // m_dbKnee is the number of dB above the threshold before we enter the "ratio" portion of the curve. | |
| 116 // m_kneeThresholdDb = m_dbThreshold + m_dbKnee | |
| 117 // The portion between m_dbThreshold and m_kneeThresholdDb is the "soft knee" portion of the curve | |
| 118 // which transitions smoothly from the linear portion to the ratio portion. | |
| 119 float m_dbKnee; | |
| 120 float m_kneeThreshold; | |
| 121 float m_kneeThresholdDb; | |
| 122 float m_ykneeThresholdDb; | |
| 123 | |
| 124 // Internal parameter for the knee portion of the curve. | |
| 125 float m_K; | |
| 126 }; | |
| 127 | |
| 128 } // namespace WebCore | |
| 129 | |
| 130 #endif // DynamicsCompressorKernel_h |
