Tempo synced Delay Plugin

data/locale/en.ts

@@ -42,11 +42,11 @@ If you're interested in translating LMMS in another language or want to imp
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;http://lmms.sourceforge.net&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;http://lmms.sourceforge.net&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</source>
+        <source>LMMS</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>LMMS</source>
+        <source>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;http://lmms.io&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;http://lmms.io&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
@@ -651,6 +651,60 @@ If you&apos;re interested in translating LMMS in another language or want to imp
         <translation type="unfinished"></translation>
     </message>
 </context>
+<context>
+    <name>DelayControls</name>
+    <message>
+        <source>Delay Samples</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Feedback</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Frequency</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Ammount</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+<context>
+    <name>DelayControlsDialog</name>
+    <message>
+		<source>Delay</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Delay Time Samples:</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Feedback</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Feedback Ammount:</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Hz</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Hz:</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Amt</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Lfo Amt:</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
 <context>
     <name>DualFilterControlDialog</name>
     <message>
@@ -7016,6 +7070,10 @@ This chip was used in the Commodore 64 computer.</source>
         <source>A NES-like synthesizer</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>A native delay plugin</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>projectNotes</name>

plugins/CMakeLists.txt

@@ -5,6 +5,7 @@ ADD_SUBDIRECTORY(bit_invader)
 ADD_SUBDIRECTORY(carlabase)
 ADD_SUBDIRECTORY(carlapatchbay)
 ADD_SUBDIRECTORY(carlarack)
+ADD_SUBDIRECTORY(delay)
 ADD_SUBDIRECTORY(DualFilter)
 ADD_SUBDIRECTORY(dynamics_processor)
 ADD_SUBDIRECTORY(flp_import)

plugins/delay/CMakeLists.txt

@@ -0,0 +1,3 @@
+INCLUDE(BuildPlugin)
+
+BUILD_PLUGIN(delay delayeffect.cpp delaycontrols.cpp delaycontrolsdialog.cpp lfo.cpp stereodelay.cpp MOCFILES delaycontrols.h EMBEDDED_RESOURCES "${CMAKE_CURRENT_SOURCE_DIR}/*.png")

plugins/delay/delaycontrols.cpp

@@ -0,0 +1,73 @@
+/*
+ * delaycontrols.cpp - definition of DelayControls class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <QtXml/QDomElement>
+
+#include "delaycontrols.h"
+#include "delayeffect.h"
+#include "engine.h"
+#include "song.h"
+
+DelayControls::DelayControls(DelayEffect* effect):
+    EffectControls( effect ),
+    m_effect ( effect ),
+    m_delayTimeModel( 2.0, 0.01, 20.0, 0.0001, 20000.0, this, tr( "Delay Samples" )) ,
+    m_feebackModel(0.0f,0.0f,1.0f,0.01f,this,tr( "Feedback" ) ),
+    m_lfoTimeModel(2.0, 0.01, 20.0, 0.0001, 20000.0, this, tr( "Lfo Frequency" ) ),
+    m_lfoAmmountModel(0.0f,0.0f,0.5f,0.01f, this, tr ( "Lfo Ammount" ) )
+{
+
+}
+
+
+
+
+void DelayControls::changeControl()
+{
+    //engine::getSong()->setModified();
+}
+
+
+
+
+void DelayControls::loadSettings(const QDomElement &_this)
+{
+    m_delayTimeModel.loadSettings(_this, "DelayTimeSamples" );
+    m_feebackModel.loadSettings( _this, "FeebackAmmount" );
+    m_lfoTimeModel.loadSettings( _this , "LfoFrequency");
+    m_lfoAmmountModel.loadSettings( _this, "LfoAmmount");
+}
+
+
+
+
+void DelayControls::saveSettings(QDomDocument& doc, QDomElement& _this)
+{
+    m_delayTimeModel.saveSettings( doc, _this, "DelayTimeSamples");
+    m_feebackModel.saveSettings( doc, _this ,"FeebackAmmount");
+    m_lfoTimeModel.saveSettings( doc, _this, "LfoFrequency");
+    m_lfoAmmountModel.saveSettings( doc, _this ,"LfoAmmount");
+}
+
+#include "moc_delaycontrols.cxx"

plugins/delay/delaycontrols.h

@@ -0,0 +1,72 @@
+/*
+ * delaycontrols.h - declaration of DelayControl class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef DELAYCONTROLS_H
+#define DELAYCONTROLS_H
+
+#include "EffectControls.h"
+#include "knob.h"
+#include "delaycontrolsdialog.h"
+
+
+
+class DelayEffect;
+
+class DelayControls : public EffectControls
+{
+    Q_OBJECT
+public:
+    DelayControls( DelayEffect* effect );
+    virtual ~DelayControls()
+    {
+    }
+    virtual void saveSettings( QDomDocument& doc, QDomElement& parent );
+    virtual void loadSettings( const QDomElement& _this );
+    inline virtual QString nodeName() const
+    {
+        return "Delay";
+    }
+    virtual int controlCount(){
+        return 4;
+    }
+    virtual EffectControlDialog* createView()
+    {
+        return new DelayControlsDialog( this );
+    }
+
+private slots:
+    void changeControl();
+
+private:
+    DelayEffect* m_effect;
+    TempoSyncKnobModel m_delayTimeModel;
+    FloatModel m_feebackModel;
+    TempoSyncKnobModel m_lfoTimeModel;
+    FloatModel m_lfoAmmountModel;
+
+    friend class DelayControlsDialog;
+    friend class DelayEffect;
+};
+
+#endif // DELAYCONTROLS_H

plugins/delay/delaycontrolsdialog.cpp

@@ -0,0 +1,70 @@
+/*
+ * delaycontrolsdialog.cpp - definition of DelayControlsDialog class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "delaycontrolsdialog.h"
+#include "delaycontrols.h"
+#include "embed.h"
+#include "TempoSyncKnob.h"
+
+
+
+
+DelayControlsDialog::DelayControlsDialog(DelayControls *controls) :
+    EffectControlDialog( controls )
+{
+    setAutoFillBackground( true );
+    QPalette pal;
+    pal.setBrush( backgroundRole(), PLUGIN_NAME::getIconPixmap( "artwork" ) );
+    setPalette( pal );
+    setFixedSize( 100,125 );
+
+    TempoSyncKnob* sampleDelayKnob = new TempoSyncKnob( knobBright_26, this );
+    sampleDelayKnob->move( 20,30 );
+    sampleDelayKnob->setVolumeKnob( false );
+    sampleDelayKnob->setModel( &controls->m_delayTimeModel );
+    sampleDelayKnob->setLabel( tr( "Delay" ) );
+    sampleDelayKnob->setHintText( tr( "Delay Time Samples:" ) + " ", "" );
+
+    knob * feedbackKnob = new knob( knobBright_26, this);
+    feedbackKnob->move( 60,30 );
+    feedbackKnob->setVolumeKnob(true);
+    feedbackKnob->setModel( &controls->m_feebackModel);
+    feedbackKnob->setLabel( tr( "Feedback" ) );
+    feedbackKnob->setHintText( tr ( "Feedback Ammount:" ) + " ", "");
+
+    TempoSyncKnob * lfoFreqKnob = new TempoSyncKnob( knobBright_26, this);
+    lfoFreqKnob->move( 20,80 );
+    lfoFreqKnob->setVolumeKnob(false);
+    lfoFreqKnob->setModel( &controls->m_lfoTimeModel);
+    lfoFreqKnob->setLabel( tr( "Lfo Hz" ) );
+    lfoFreqKnob->setHintText( tr ( "Lfo Hz:" ) + " ", "");
+
+    knob * lfoAmtKnob = new knob( knobBright_26, this);
+    lfoAmtKnob->move( 60,80 );
+    lfoAmtKnob->setVolumeKnob(true);
+    lfoAmtKnob->setModel( &controls->m_lfoAmmountModel);
+    lfoAmtKnob->setLabel( tr( "Lfo Amt" ) );
+    lfoAmtKnob->setHintText( tr ( "Lfo Amt:" ) + " ", "");
+
+}

plugins/delay/delaycontrolsdialog.h

@@ -0,0 +1,41 @@
+/*
+ * delaycontrolsdialog.h - declaration of DelayControlsDialog class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef DELAYCONTROLSDIALOG_H
+#define DELAYCONTROLSDIALOG_H
+
+#include "EffectControlDialog.h"
+
+class DelayControls;
+
+class DelayControlsDialog : public EffectControlDialog
+{
+public:
+    DelayControlsDialog(DelayControls* controls );
+    virtual ~DelayControlsDialog()
+    {
+    }
+};
+
+#endif // DELAYCONTROLSDIALOG_H

plugins/delay/delayeffect.cpp

@@ -0,0 +1,115 @@
+/*
+ * delayeffect.cpp - definition of the DelayEffect class. The Delay Plugin
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "delayeffect.h"
+#include "engine.h"
+#include "embed.cpp"
+
+
+extern "C"
+{
+
+Plugin::Descriptor PLUGIN_EXPORT delay_plugin_descriptor =
+{
+    STRINGIFY( PLUGIN_NAME ),
+    "Delay",
+    QT_TRANSLATE_NOOP( "pluginBrowser", "A native delay plugin" ),
+    "Dave French <contact/dot/dave/dot/french3/at/googlemail/dot/com>",
+    0x0100,
+    Plugin::Effect,
+    new PluginPixmapLoader( "logo" ),
+    NULL,
+    NULL
+} ;
+
+
+
+
+DelayEffect::DelayEffect( Model* parent, const Plugin::Descriptor::SubPluginFeatures::Key* key ) :
+    Effect( &delay_plugin_descriptor, parent, key ),
+    m_delayControls( this )
+{
+    m_delay = 0;
+    m_delay = new StereoDelay( engine::mixer()->processingSampleRate()* 20 );
+    m_lfo = new Lfo( engine::mixer()->processingSampleRate() );
+}
+
+
+
+DelayEffect::~DelayEffect()
+{
+    if( m_delay )
+    {
+        delete m_delay;
+    }
+    if( m_lfo )
+    {
+        delete m_lfo;
+    }
+}
+
+
+
+
+bool DelayEffect::processAudioBuffer(sampleFrame* buf, const fpp_t frames)
+{
+    if( !isEnabled() || !isRunning () )
+    {
+        return( false );
+    }
+    double outSum = 0.0;
+    const float d = dryLevel();
+    const float w = wetLevel();
+    sample_t dryS[2];
+    for( fpp_t f = 0; f < frames; ++f )
+    {
+        dryS[0] = buf[f][0];
+        dryS[1] = buf[f][1];
+        m_lfo->setAmplitude( m_delayControls.m_lfoAmmountModel.value( f ) );
+        m_lfo->setFrequency( 1.0 / m_delayControls.m_lfoTimeModel.value( f ) );
+        m_delay->setLength( m_delayControls.m_delayTimeModel.value(f) * engine::mixer()->processingSampleRate() * m_lfo->tick() );
+        m_delay->setFeedback( m_delayControls.m_feebackModel.value( f ) );
+        m_delay->tick( &buf[f][0], &buf[f][1] );
+
+        buf[f][0] = ( d * dryS[0] ) + ( w * buf[f][0] );
+        buf[f][1] = ( d * dryS[1] ) + ( w * buf[f][1] );
+        outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
+    }
+    checkGate( outSum / frames );
+    return isRunning();
+}
+
+
+
+extern "C"
+{
+
+//needed for getting plugin out of shared lib
+Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
+{
+    return new DelayEffect( parent , static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
+}
+
+}}
+

plugins/delay/delayeffect.h

@@ -0,0 +1,49 @@
+/*
+ * delayeffect.h - declaration of DelayEffect class, the Delay plugin
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef DELAYEFFECT_H
+#define DELAYEFFECT_H
+
+#include "Effect.h"
+#include "delaycontrols.h"
+#include "lfo.h"
+#include "stereodelay.h"
+
+class DelayEffect : public Effect
+{
+public:
+    DelayEffect(Model* parent , const Descriptor::SubPluginFeatures::Key* key );
+    virtual ~DelayEffect();
+    virtual bool processAudioBuffer( sampleFrame* buf, const fpp_t frames);
+    virtual EffectControls* controls()
+    {
+        return &m_delayControls;
+    }
+private:
+    DelayControls m_delayControls;
+    StereoDelay* m_delay;
+    Lfo* m_lfo;
+};
+
+#endif // DELAYEFFECT_H

plugins/delay/lfo.cpp

@@ -0,0 +1,79 @@
+/*
+ * lfo.cpp - defination of Lfo class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "lfo.h"
+#include <math.h>
+
+
+
+
+Lfo::Lfo( int samplerate )
+{
+    m_samplerate = samplerate;
+    m_twoPiOverSr = TWOPI / samplerate;
+}
+
+
+
+void Lfo::setFrequency( double frequency )
+{
+    if( frequency < 0 || frequency > ( m_samplerate / 2.0 ) || frequency == m_frequency )
+    {
+        return;
+    }
+    m_frequency = frequency;
+    m_increment = m_frequency * m_twoPiOverSr;
+}
+
+
+
+
+void Lfo::setAmplitude( float amplitude )
+{
+    if( amplitude < 0.0 || amplitude > 1.0 )
+    {
+        return;
+    }
+    m_amplitude = amplitude;
+}
+
+
+
+
+float Lfo::tick()
+{
+    float output = ( float )sin( m_phase );
+    m_phase += m_increment;
+    if( m_phase >= TWOPI )
+    {
+        m_phase -= TWOPI;
+    }
+    if( m_amplitude > 0.0001 )
+    {
+        return ( ( output + 1.0 ) / 2.0 ) * m_amplitude;
+    } else
+    {
+        return 1;
+    }
+}

plugins/delay/lfo.h

@@ -0,0 +1,53 @@
+/*
+ * lfo.h - declaration of Lfo class, a simple sine lfo
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LFO_H
+#define LFO_H
+
+#ifndef M_PI
+#define M_PI (3.14159265358979321 )
+#endif
+#define TWOPI ( 2.0 * M_PI )
+
+class Lfo
+{
+public:
+    Lfo( int samplerate );
+    ~Lfo()
+    {
+    }
+    void setFrequency( double frequency );
+    void setAmplitude( float amplitude );
+    float tick();
+
+private:
+    double m_frequency;
+    double m_phase;
+    double m_increment;
+    double m_amplitude;
+    double m_twoPiOverSr;
+    int m_samplerate;
+};
+
+#endif // LFO_H

plugins/delay/stereodelay.cpp

@@ -0,0 +1,100 @@
+/*
+ * stereodelay.cpp - defination of StereoDelay class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "stereodelay.h"
+#include <cstdlib>
+
+
+StereoDelay::StereoDelay(int maxLength)
+{
+    m_buffer = 0;
+    m_buffer = ( float* )malloc(maxLength*2*sizeof( float ) );
+    m_maxLength = maxLength;
+    m_length = m_maxLength;
+    m_index = 0;
+    m_feedback = 0.0f;
+    setLength( 0 );
+}
+
+
+
+
+StereoDelay::~StereoDelay()
+{
+    if( m_buffer )
+    {
+        free( m_buffer );
+    }
+}
+
+
+
+
+void StereoDelay::setLength( int length )
+{
+    if( length <= m_maxLength && length >= 0 )
+    {
+        if( length < m_length )
+        {
+            for( int i = length * 2; i < m_length *2; i++)
+            {
+                m_buffer[i] = 0.0f;
+            }
+        }
+        m_length = length;
+    }
+}
+
+
+
+
+void StereoDelay::setFeedback( float feedback )
+{
+    m_feedback = feedback;
+}
+
+
+
+float m_oldLeft;
+float m_oldRight;
+void StereoDelay::tick( float* left, float* right )
+{
+    m_oldLeft = m_buffer[m_index];
+    m_oldRight = m_buffer[m_index+1];
+    m_buffer[m_index] = *left + ( m_oldLeft * m_feedback );
+    m_buffer[m_index+1] = *right + ( m_oldRight * m_feedback );
+    *left = m_oldLeft;
+    *right = m_oldRight;
+    m_index++; m_index++;
+    if( m_index > m_length )
+    {
+        m_index = 0;
+    }
+}
+
+
+
+
+
+

plugins/delay/stereodelay.h

@@ -0,0 +1,44 @@
+/*
+ * stereodelay.h - declaration of StereoDelay class.
+ *
+ * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef STEREODELAY_H
+#define STEREODELAY_H
+
+class StereoDelay
+{
+public:
+    StereoDelay( int maxLength );
+    ~StereoDelay();
+    void setLength( int length );
+    void setFeedback( float feedback );
+    void tick( float* left, float* right );
+private:
+    float *m_buffer;
+    int m_maxLength;
+    int m_length;
+    int m_index;
+    float m_feedback;
+};
+
+#endif // STEREODELAY_H