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124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
/*
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* Copyright (C) 2011 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef DynamicsCompressor_h
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#define DynamicsCompressor_h
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#include "DynamicsCompressorKernel.h"
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#include "ZeroPole.h"
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#include "nsTArray.h"
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#include "nsAutoPtr.h"
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namespace mozilla {
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struct AudioChunk;
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}
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namespace WebCore {
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using mozilla::AudioChunk;
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// DynamicsCompressor implements a flexible audio dynamics compression effect such as
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// is commonly used in musical production and game audio. It lowers the volume
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// of the loudest parts of the signal and raises the volume of the softest parts,
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// making the sound richer, fuller, and more controlled.
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class DynamicsCompressor {
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public:
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enum {
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ParamThreshold,
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ParamKnee,
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ParamRatio,
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ParamAttack,
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ParamRelease,
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ParamPreDelay,
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ParamReleaseZone1,
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ParamReleaseZone2,
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ParamReleaseZone3,
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ParamReleaseZone4,
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ParamPostGain,
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ParamFilterStageGain,
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ParamFilterStageRatio,
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ParamFilterAnchor,
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ParamEffectBlend,
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ParamReduction,
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ParamLast
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};
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DynamicsCompressor(float sampleRate, unsigned numberOfChannels);
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void process(const AudioChunk* sourceChunk, AudioChunk* destinationChunk, unsigned framesToProcess);
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void reset();
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void setNumberOfChannels(unsigned);
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unsigned numberOfChannels() const { return m_numberOfChannels; }
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void setParameterValue(unsigned parameterID, float value);
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float parameterValue(unsigned parameterID);
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float sampleRate() const { return m_sampleRate; }
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float nyquist() const { return m_sampleRate / 2; }
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double tailTime() const { return 0; }
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double latencyTime() const { return m_compressor.latencyFrames() / static_cast<double>(sampleRate()); }
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protected:
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unsigned m_numberOfChannels;
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// m_parameters holds the tweakable compressor parameters.
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float m_parameters[ParamLast];
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void initializeParameters();
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float m_sampleRate;
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// Emphasis filter controls.
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float m_lastFilterStageRatio;
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float m_lastAnchor;
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float m_lastFilterStageGain;
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typedef struct {
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ZeroPole filters[4];
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} ZeroPoleFilterPack4;
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// Per-channel emphasis filters.
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nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_preFilterPacks;
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nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_postFilterPacks;
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nsAutoArrayPtr<const float*> m_sourceChannels;
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nsAutoArrayPtr<float*> m_destinationChannels;
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void setEmphasisStageParameters(unsigned stageIndex, float gain, float normalizedFrequency /* 0 -> 1 */);
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void setEmphasisParameters(float gain, float anchorFreq, float filterStageRatio);
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// The core compressor.
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DynamicsCompressorKernel m_compressor;
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};
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} // namespace WebCore
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#endif // DynamicsCompressor_h
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