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comparison: content/media/webaudio/blink/DynamicsCompressor.h
content/media/webaudio/blink/DynamicsCompressor.h
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- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:1cbd14cebda0 |
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| 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 DynamicsCompressor_h | |
| 30 #define DynamicsCompressor_h | |
| 31 | |
| 32 #include "DynamicsCompressorKernel.h" | |
| 33 #include "ZeroPole.h" | |
| 34 | |
| 35 #include "nsTArray.h" | |
| 36 #include "nsAutoPtr.h" | |
| 37 #include "mozilla/MemoryReporting.h" | |
| 38 | |
| 39 namespace mozilla { | |
| 40 struct AudioChunk; | |
| 41 } | |
| 42 | |
| 43 namespace WebCore { | |
| 44 | |
| 45 using mozilla::AudioChunk; | |
| 46 | |
| 47 // DynamicsCompressor implements a flexible audio dynamics compression effect such as | |
| 48 // is commonly used in musical production and game audio. It lowers the volume | |
| 49 // of the loudest parts of the signal and raises the volume of the softest parts, | |
| 50 // making the sound richer, fuller, and more controlled. | |
| 51 | |
| 52 class DynamicsCompressor { | |
| 53 public: | |
| 54 enum { | |
| 55 ParamThreshold, | |
| 56 ParamKnee, | |
| 57 ParamRatio, | |
| 58 ParamAttack, | |
| 59 ParamRelease, | |
| 60 ParamPreDelay, | |
| 61 ParamReleaseZone1, | |
| 62 ParamReleaseZone2, | |
| 63 ParamReleaseZone3, | |
| 64 ParamReleaseZone4, | |
| 65 ParamPostGain, | |
| 66 ParamFilterStageGain, | |
| 67 ParamFilterStageRatio, | |
| 68 ParamFilterAnchor, | |
| 69 ParamEffectBlend, | |
| 70 ParamReduction, | |
| 71 ParamLast | |
| 72 }; | |
| 73 | |
| 74 DynamicsCompressor(float sampleRate, unsigned numberOfChannels); | |
| 75 | |
| 76 void process(const AudioChunk* sourceChunk, AudioChunk* destinationChunk, unsigned framesToProcess); | |
| 77 void reset(); | |
| 78 void setNumberOfChannels(unsigned); | |
| 79 unsigned numberOfChannels() const { return m_numberOfChannels; } | |
| 80 | |
| 81 void setParameterValue(unsigned parameterID, float value); | |
| 82 float parameterValue(unsigned parameterID); | |
| 83 | |
| 84 float sampleRate() const { return m_sampleRate; } | |
| 85 float nyquist() const { return m_sampleRate / 2; } | |
| 86 | |
| 87 double tailTime() const { return 0; } | |
| 88 double latencyTime() const { return m_compressor.latencyFrames() / static_cast<double>(sampleRate()); } | |
| 89 | |
| 90 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 91 | |
| 92 protected: | |
| 93 unsigned m_numberOfChannels; | |
| 94 | |
| 95 // m_parameters holds the tweakable compressor parameters. | |
| 96 float m_parameters[ParamLast]; | |
| 97 void initializeParameters(); | |
| 98 | |
| 99 float m_sampleRate; | |
| 100 | |
| 101 // Emphasis filter controls. | |
| 102 float m_lastFilterStageRatio; | |
| 103 float m_lastAnchor; | |
| 104 float m_lastFilterStageGain; | |
| 105 | |
| 106 typedef struct { | |
| 107 ZeroPole filters[4]; | |
| 108 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 109 { | |
| 110 return aMallocSizeOf(this); | |
| 111 } | |
| 112 } ZeroPoleFilterPack4; | |
| 113 | |
| 114 // Per-channel emphasis filters. | |
| 115 nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_preFilterPacks; | |
| 116 nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_postFilterPacks; | |
| 117 | |
| 118 nsAutoArrayPtr<const float*> m_sourceChannels; | |
| 119 nsAutoArrayPtr<float*> m_destinationChannels; | |
| 120 | |
| 121 void setEmphasisStageParameters(unsigned stageIndex, float gain, float normalizedFrequency /* 0 -> 1 */); | |
| 122 void setEmphasisParameters(float gain, float anchorFreq, float filterStageRatio); | |
| 123 | |
| 124 // The core compressor. | |
| 125 DynamicsCompressorKernel m_compressor; | |
| 126 }; | |
| 127 | |
| 128 } // namespace WebCore | |
| 129 | |
| 130 #endif // DynamicsCompressor_h |
