From 78431322cc77b9654fa4a2e2b1b42a9310cb9141 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <timblech@users.sourceforge.net>
Date: Mon, 2 Aug 2004 21:13:50 +0000
Subject: lag

svn path=/trunk/externals/tb/; revision=1905
---
 sc4pd/source/Lag.cpp | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 sc4pd/source/Lag.cpp

(limited to 'sc4pd/source/Lag.cpp')

diff --git a/sc4pd/source/Lag.cpp b/sc4pd/source/Lag.cpp
new file mode 100644
index 0000000..81482a8
--- /dev/null
+++ b/sc4pd/source/Lag.cpp
@@ -0,0 +1,124 @@
+/* sc4pd 
+   Lag~, Lag
+
+   Copyright (c) 2004 Tim Blechmann.                                       
+
+   This code is derived from:
+	SuperCollider real time audio synthesis system
+    Copyright (c) 2002 James McCartney. All rights reserved.
+	http://www.audiosynth.com
+
+
+   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; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+   Based on:
+     PureData by Miller Puckette and others.
+         http://www.crca.ucsd.edu/~msp/software.html
+     FLEXT by Thomas Grill
+         http://www.parasitaere-kapazitaeten.net/ext
+     SuperCollider by James McCartney
+         http://www.audiosynth.com
+     
+   Coded while listening to: VA: Live from the Vision Festival
+   
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ Lag~ -----------------------------*/
+
+class Lag_ar
+    :public flext_dsp
+{
+    FLEXT_HEADER(Lag_ar,flext_dsp);
+
+public:
+    Lag_ar(int argc,t_atom * argv);
+
+protected:
+    virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
+    virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out);
+    void m_set(float f);
+
+private:
+    FLEXT_CALLBACK_F(m_set);
+    float m_b1, n_b1;
+    float m_y1;
+    float m_lag;
+    bool changed;
+};
+
+FLEXT_LIB_DSP_V("Lag~",Lag_ar);
+
+Lag_ar::Lag_ar(int argc,t_atom * argv)
+{
+    FLEXT_ADDMETHOD_(0,"lagTime",m_set);
+
+    AtomList Args(argc,argv);
+
+    m_lag = sc_getfloatarg(Args,0);
+
+    AddOutSignal();
+
+    m_y1 = 0.f;
+}
+
+void Lag_ar::m_dsp(int n, t_sample *const *in, 
+		   t_sample *const *out)
+{
+    changed = false;
+    m_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
+}
+
+void Lag_ar::m_signal(int n, t_sample *const *in, 
+		      t_sample *const *out)
+{
+    t_sample *nout = *out;
+    t_sample *nin = *in;
+
+    float y1 = m_y1;
+    float b1 = m_b1;
+
+    if (changed)
+    {
+	float b1_slope = CALCSLOPE(m_b1, n_b1);
+	m_b1 = n_b1;
+	for (int i = 0; i!= n;++i)
+	{
+	    float y0 = ZXP(nin); 
+	    ZXP(nout) = y1 = y0 + b1 * (y1 - y0);
+	    b1 += b1_slope;
+	}
+	changed = false;
+    }
+    else
+    {
+	for (int i = 0; i!= n;++i)
+	{
+	    float y0 = ZXP(nin); 
+	    ZXP(nout) = y1 = y0 + b1 * (y1 - y0);
+	}
+    }
+    m_y1 = zapgremlins(y1);
+}
+    
+void Lag_ar::m_set(float f)
+{
+    m_lag = f;
+    n_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
+    changed = true;
+}
+
+/* todo: does a control rate Lag make sense? */
-- 
cgit v1.2.1


From 89f570e5ebeab979202acf679974bafd05072692 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <timblech@users.sourceforge.net>
Date: Sat, 7 Aug 2004 14:01:31 +0000
Subject: sc4pd_dsp class and other changes

svn path=/trunk/externals/tb/; revision=1912
---
 sc4pd/source/Lag.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'sc4pd/source/Lag.cpp')

diff --git a/sc4pd/source/Lag.cpp b/sc4pd/source/Lag.cpp
index 81482a8..5daf6d1 100644
--- a/sc4pd/source/Lag.cpp
+++ b/sc4pd/source/Lag.cpp
@@ -40,9 +40,9 @@
 /* ------------------------ Lag~ -----------------------------*/
 
 class Lag_ar
-    :public flext_dsp
+    :public sc4pd_dsp
 {
-    FLEXT_HEADER(Lag_ar,flext_dsp);
+    FLEXT_HEADER(Lag_ar,sc4pd_dsp);
 
 public:
     Lag_ar(int argc,t_atom * argv);
-- 
cgit v1.2.1