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Implemented LinearSmoothedValueAtomic class.
* Implemented LinearSmoothedValueAtomic class based on the JUCE 4.0 library' LinearSmoothedValue class but with some improvements that were suggested by Timur Doumler during his JUCE Summit 2015 talk. * LinearSmoothedValueAtomic is very convenient to use with float values that need linearly smoothed behaviour (like volume, etc.) and which are shared between several threads (i.e. audio and GUI). * This class guarantees we won't have any race conditions and it will remains lock-free because of using std::atomic inside it.
1 parent dbcd7ff commit 7b9078e

8 files changed

Lines changed: 154 additions & 8 deletions

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‎Builds/MacOSX/open-ephys.xcodeproj/project.pbxproj‎

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‎Builds/VisualStudio2012/open-ephys.vcxproj‎

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<ClInclude Include="..\..\Source\Audio\AudioComponent.h"/>
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<ClInclude Include="..\..\Source\Processors\PlaceholderProcessor\PlaceholderProcessorEditor.h"/>
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<ClInclude Include="..\..\Source\Processors\PlaceholderProcessor\PlaceholderProcessor.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\LinearSmoothedValueAtomic.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Bessel.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Biquad.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Butterworth.h"/>

‎Builds/VisualStudio2012/open-ephys.vcxproj.filters‎

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</ClInclude>
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‎Builds/VisualStudio2013/open-ephys.vcxproj‎

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<ClInclude Include="..\..\Source\Audio\AudioComponent.h"/>
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<ClInclude Include="..\..\Source\Processors\PlaceholderProcessor\PlaceholderProcessorEditor.h"/>
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<ClInclude Include="..\..\Source\Processors\PlaceholderProcessor\PlaceholderProcessor.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\LinearSmoothedValueAtomic.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Bessel.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Biquad.h"/>
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<ClInclude Include="..\..\Source\Processors\Dsp\Butterworth.h"/>

‎Builds/VisualStudio2013/open-ephys.vcxproj.filters‎

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‎Source/Processors/Dsp/LinearSmoothedValueAtomic.h‎

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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_LINEARSMOOTHEDVALUE_H_INCLUDED
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#define JUCE_LINEARSMOOTHEDVALUE_H_INCLUDED
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#include "../PluginManager/OpenEphysPlugin.h"
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#include <atomic>
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//==============================================================================
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/**
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Utility class for linearly smoothed values like volume etc. that should
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not change abruptly but as a linear ramp, to avoid audio glitches.
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This class was modified by Open Ephys and just an improvement of LinearSmoothedValue
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class from the JUCE 4.0 library, but with some features made that were suggested
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by Timur Doumler during his JUCE Summit 2015 talk, to make it lock-free and guarantee
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that no race conditions will ever occur using it.
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Usage:
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- set value by calling setValue() method;
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- get value by calling updateTarget() and then getNextValue() method.
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We need to call updateTarget() because we should suppose the value could be changed before
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so we need to update it smoothly and then use it.
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*/
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//==============================================================================
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template<typename FloatType>
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class PLUGIN_API LinearSmoothedValueAtomic
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{
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public:
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/** Constructor. */
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LinearSmoothedValueAtomic() noexcept
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: currentValue (0)
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, target (0)
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, step (0)
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, countdown (0)
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, stepsToTarget (0)
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{
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}
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/** Constructor. */
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LinearSmoothedValueAtomic (FloatType initialValue) noexcept
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: currentValue (initialValue)
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, target (initialValue)
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, step (0)
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, countdown (0)
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, stepsToTarget (0)
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{
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}
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//==========================================================================
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/** Reset to a new sample rate and ramp length. */
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void reset (double sampleRate, double rampLengthInSeconds) noexcept
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{
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jassert (sampleRate > 0 && rampLengthInSeconds >= 0);
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stepsToTarget = (int) std::floor (rampLengthInSeconds * sampleRate);
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currentValue = target;
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countdown = 0;
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}
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//==========================================================================
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/** Set a new target value. */
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void setValue (FloatType newValue) noexcept
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{
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target.store (newValue);
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}
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//==========================================================================
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void updateTarget() noexcept
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{
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FloatType newTarget = target.load();
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if (newTarget != currentTarget)
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{
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currentTarget = newTarget;
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countdown = stepsToTarget;
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if (countdown <= 0)
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currentValue = currentTarget;
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else
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step = (currentTarget - currentValue) / (FloatType) countdown;
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}
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}
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//==========================================================================
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/** Compute the next value. */
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FloatType getNextValue() noexcept
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{
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if (countdown <= 0)
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return currentTarget;
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--countdown;
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currentValue += step;
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return currentValue;
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}
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private:
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//==========================================================================
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std::atomic<FloatType> target;
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FloatType currentValue;
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FloatType currentTarget;
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FloatType step;
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int countdown;
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int stepsToTarget;
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};
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#endif // JUCE_LINEARSMOOTHEDVALUE_H_INCLUDED

‎Source/Processors/GenericProcessor/GenericProcessor.h‎

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#include "../Channel/Channel.h"
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#include "../../CoreServices.h"
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#include "../PluginManager/PluginClass.h"
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#include "../../Processors/Dsp/LinearSmoothedValueAtomic.h"
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#include <time.h>
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#include <stdio.h>

‎open-ephys.jucer‎

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file="Source/Processors/PlaceholderProcessor/PlaceholderProcessor.h"/>
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</GROUP>
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<GROUP id="{9F37E2FD-6871-8370-4C11-5C97DF132390}" name="Dsp">
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<FILE id="mwFwwT" name="LinearSmoothedValueAtomic.h" compile="0" resource="0"
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file="Source/Processors/Dsp/LinearSmoothedValueAtomic.h"/>
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<FILE id="qWmKwI" name="Bessel.cpp" compile="1" resource="0" file="Source/Processors/Dsp/Bessel.cpp"/>
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<FILE id="bRbpDP" name="Bessel.h" compile="0" resource="0" file="Source/Processors/Dsp/Bessel.h"/>
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<FILE id="olRf2q" name="Biquad.cpp" compile="1" resource="0" file="Source/Processors/Dsp/Biquad.cpp"/>

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