From 76fd8bc21e49036a8187e7a6b75c36daa842cbc6 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Fri, 31 Dec 2010 03:00:34 +0000
Subject: refactored d_fft.c and d_math.c into separate objectclases

svn path=/trunk/; revision=14683
---
 externals/vanilla/framp~.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 externals/vanilla/framp~.c

(limited to 'externals/vanilla/framp~.c')

diff --git a/externals/vanilla/framp~.c b/externals/vanilla/framp~.c
new file mode 100644
index 00000000..4b7a3398
--- /dev/null
+++ b/externals/vanilla/framp~.c
@@ -0,0 +1,97 @@
+/* Copyright (c) 1997- Miller Puckette and others.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+#include "m_pd.h"
+
+/* This file interfaces to one of the Mayer, Ooura, or fftw FFT packages
+to implement the "fft~", etc, Pd objects.  If using Mayer, also compile
+d_fft_mayer.c; if ooura, use d_fft_fftsg.c instead; if fftw, use d_fft_fftw.c
+and also link in the fftw library.  You can only have one of these three
+linked in.  The configure script can be used to select which one.
+*/
+
+static t_class *sigframp_class;
+
+typedef struct framp
+{
+    t_object x_obj;
+    t_float x_f;
+} t_sigframp;
+
+static void *sigframp_new(void)
+{
+    t_sigframp *x = (t_sigframp *)pd_new(sigframp_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+    outlet_new(&x->x_obj, gensym("signal"));
+    outlet_new(&x->x_obj, gensym("signal"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *sigframp_perform(t_int *w)
+{
+    t_sample *inreal = (t_sample *)(w[1]);
+    t_sample *inimag = (t_sample *)(w[2]);
+    t_sample *outfreq = (t_sample *)(w[3]);
+    t_sample *outamp = (t_sample *)(w[4]);
+    t_sample lastreal = 0, currentreal = inreal[0], nextreal = inreal[1];
+    t_sample lastimag = 0, currentimag = inimag[0], nextimag = inimag[1];
+    int n = w[5];
+    int m = n + 1;
+    t_sample fbin = 1, oneovern2 = 1.f/((t_sample)n * (t_sample)n);
+    
+    inreal += 2;
+    inimag += 2;
+    *outamp++ = *outfreq++ = 0;
+    n -= 2;
+    while (n--)
+    {
+        t_sample re, im, pow, freq;
+        lastreal = currentreal;
+        currentreal = nextreal;
+        nextreal = *inreal++;
+        lastimag = currentimag;
+        currentimag = nextimag;
+        nextimag = *inimag++;
+        re = currentreal - 0.5f * (lastreal + nextreal);
+        im = currentimag - 0.5f * (lastimag + nextimag);
+        pow = re * re + im * im;
+        if (pow > 1e-19)
+        {
+            t_sample detune = ((lastreal - nextreal) * re +
+                    (lastimag - nextimag) * im) / (2.0f * pow);
+            if (detune > 2 || detune < -2) freq = pow = 0;
+            else freq = fbin + detune;
+        }
+        else freq = pow = 0;
+        *outfreq++ = freq;
+        *outamp++ = oneovern2 * pow;
+        fbin += 1.0f;
+    }
+    while (m--) *outamp++ = *outfreq++ = 0;
+    return (w+6);
+}
+
+t_int *sigsqrt_perform(t_int *w);
+
+static void sigframp_dsp(t_sigframp *x, t_signal **sp)
+{
+    int n = sp[0]->s_n, n2 = (n>>1);
+    if (n < 4)
+    {
+        error("framp: minimum 4 points");
+        return;
+    }
+    dsp_add(sigframp_perform, 5, sp[0]->s_vec, sp[1]->s_vec,
+        sp[2]->s_vec, sp[3]->s_vec, n2);
+    dsp_add(sigsqrt_perform, 3, sp[3]->s_vec, sp[3]->s_vec, n2);
+}
+
+void framp_tilde_setup(void)
+{
+    sigframp_class = class_new(gensym("framp~"), sigframp_new, 0,
+        sizeof(t_sigframp), 0, 0);
+    CLASS_MAINSIGNALIN(sigframp_class, t_sigframp, x_f);
+    class_addmethod(sigframp_class, (t_method)sigframp_dsp, gensym("dsp"), 0);
+}
-- 
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