From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/media/webaudio/blink/DynamicsCompressor.h | 131 ++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 dom/media/webaudio/blink/DynamicsCompressor.h (limited to 'dom/media/webaudio/blink/DynamicsCompressor.h') diff --git a/dom/media/webaudio/blink/DynamicsCompressor.h b/dom/media/webaudio/blink/DynamicsCompressor.h new file mode 100644 index 000000000..f460836b4 --- /dev/null +++ b/dom/media/webaudio/blink/DynamicsCompressor.h @@ -0,0 +1,131 @@ +/* + * Copyright (C) 2011 Google Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of + * its contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef DynamicsCompressor_h +#define DynamicsCompressor_h + +#include "DynamicsCompressorKernel.h" +#include "ZeroPole.h" + +#include "nsTArray.h" +#include "nsAutoPtr.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/UniquePtr.h" + +namespace mozilla { +class AudioBlock; +} // namespace mozilla + +namespace WebCore { + +using mozilla::AudioBlock; + +// DynamicsCompressor implements a flexible audio dynamics compression effect such as +// is commonly used in musical production and game audio. It lowers the volume +// of the loudest parts of the signal and raises the volume of the softest parts, +// making the sound richer, fuller, and more controlled. + +class DynamicsCompressor { +public: + enum { + ParamThreshold, + ParamKnee, + ParamRatio, + ParamAttack, + ParamRelease, + ParamPreDelay, + ParamReleaseZone1, + ParamReleaseZone2, + ParamReleaseZone3, + ParamReleaseZone4, + ParamPostGain, + ParamFilterStageGain, + ParamFilterStageRatio, + ParamFilterAnchor, + ParamEffectBlend, + ParamReduction, + ParamLast + }; + + DynamicsCompressor(float sampleRate, unsigned numberOfChannels); + + void process(const AudioBlock* sourceChunk, AudioBlock* destinationChunk, unsigned framesToProcess); + void reset(); + void setNumberOfChannels(unsigned); + unsigned numberOfChannels() const { return m_numberOfChannels; } + + void setParameterValue(unsigned parameterID, float value); + float parameterValue(unsigned parameterID); + + float sampleRate() const { return m_sampleRate; } + float nyquist() const { return m_sampleRate / 2; } + + double tailTime() const { return 0; } + double latencyTime() const { return m_compressor.latencyFrames() / static_cast(sampleRate()); } + + size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + +protected: + unsigned m_numberOfChannels; + + // m_parameters holds the tweakable compressor parameters. + float m_parameters[ParamLast]; + void initializeParameters(); + + float m_sampleRate; + + // Emphasis filter controls. + float m_lastFilterStageRatio; + float m_lastAnchor; + float m_lastFilterStageGain; + + typedef struct { + ZeroPole filters[4]; + size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const + { + return aMallocSizeOf(this); + } + } ZeroPoleFilterPack4; + + // Per-channel emphasis filters. + nsTArray > m_preFilterPacks; + nsTArray > m_postFilterPacks; + + mozilla::UniquePtr m_sourceChannels; + mozilla::UniquePtr m_destinationChannels; + + void setEmphasisStageParameters(unsigned stageIndex, float gain, float normalizedFrequency /* 0 -> 1 */); + void setEmphasisParameters(float gain, float anchorFreq, float filterStageRatio); + + // The core compressor. + DynamicsCompressorKernel m_compressor; +}; + +} // namespace WebCore + +#endif // DynamicsCompressor_h -- cgit v1.2.3