The Tor Browser: content/media/webaudio/blink/DynamicsCompressor.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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  */

    29 #ifndef DynamicsCompressor_h

    30 #define DynamicsCompressor_h

    32 #include "DynamicsCompressorKernel.h"

    33 #include "ZeroPole.h"

    35 #include "nsTArray.h"

    36 #include "nsAutoPtr.h"

    37 #include "mozilla/MemoryReporting.h"

    39 namespace mozilla {

    40 struct AudioChunk;

    41 }

    43 namespace WebCore {

    45 using mozilla::AudioChunk;

    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.

    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     };

    74     DynamicsCompressor(float sampleRate, unsigned numberOfChannels);

    76     void process(const AudioChunk* sourceChunk, AudioChunk* destinationChunk, unsigned framesToProcess);

    77     void reset();

    78     void setNumberOfChannels(unsigned);

    79     unsigned numberOfChannels() const { return m_numberOfChannels; }

    81     void setParameterValue(unsigned parameterID, float value);

    82     float parameterValue(unsigned parameterID);

    84     float sampleRate() const { return m_sampleRate; }

    85     float nyquist() const { return m_sampleRate / 2; }

    87     double tailTime() const { return 0; }

    88     double latencyTime() const { return m_compressor.latencyFrames() / static_cast<double>(sampleRate()); }

    90     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

    92 protected:

    93     unsigned m_numberOfChannels;

    95     // m_parameters holds the tweakable compressor parameters.

    96     float m_parameters[ParamLast];

    97     void initializeParameters();

    99     float m_sampleRate;

   101     // Emphasis filter controls.

   102     float m_lastFilterStageRatio;

   103     float m_lastAnchor;

   104     float m_lastFilterStageGain;

   106     typedef struct {

   107         ZeroPole filters[4];

   108         size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const

   109         {

   110             return aMallocSizeOf(this);

   111         }

   112     } ZeroPoleFilterPack4;

   114     // Per-channel emphasis filters.

   115     nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_preFilterPacks;

   116     nsTArray<nsAutoPtr<ZeroPoleFilterPack4> > m_postFilterPacks;

   118     nsAutoArrayPtr<const float*> m_sourceChannels;

   119     nsAutoArrayPtr<float*> m_destinationChannels;

   121     void setEmphasisStageParameters(unsigned stageIndex, float gain, float normalizedFrequency /* 0 -> 1 */);

   122     void setEmphasisParameters(float gain, float anchorFreq, float filterStageRatio);

   124     // The core compressor.

   125     DynamicsCompressorKernel m_compressor;

   126 };

   128 } // namespace WebCore

   130 #endif // DynamicsCompressor_h

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