1 files changed, 71 insertions, 0 deletions
diff --git a/externals/vanilla/rifft~.c b/externals/vanilla/rifft~.c
new file mode 100644
index 00000000..53cb1354
--- /dev/null
+++ b/externals/vanilla/rifft~.c
@@ -0,0 +1,71 @@
+/* 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"
+#include "e_fft.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 *sigrifft_class;
+
+typedef struct rifft
+{
+    t_object x_obj;
+    t_float x_f;
+} t_sigrifft;
+
+static void *sigrifft_new(void)
+{
+    t_sigrifft *x = (t_sigrifft *)pd_new(sigrifft_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+    outlet_new(&x->x_obj, gensym("signal"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *sigrifft_perform(t_int *w)
+{
+    t_sample *in = (t_sample *)(w[1]);
+    int n = w[2];
+    mayer_realifft(n, in);
+    return (w+3);
+}
+
+static void sigrifft_dsp(t_sigrifft *x, t_signal **sp)
+{
+    int n = sp[0]->s_n, n2 = (n>>1);
+    t_sample *in1 = sp[0]->s_vec;
+    t_sample *in2 = sp[1]->s_vec;
+    t_sample *out1 = sp[2]->s_vec;
+    if (n < 4)
+    {
+        error("fft: minimum 4 points");
+        return;
+    }
+    if (in2 == out1)
+    {
+        dsp_add(sigrfft_flip, 3, out1+1, out1 + n, n2-1);
+        dsp_add(copy_perform, 3, in1, out1, n2+1);
+    }
+    else
+    {
+        if (in1 != out1) dsp_add(copy_perform, 3, in1, out1, n2+1);
+        dsp_add(sigrfft_flip, 3, in2+1, out1 + n, n2-1);
+    }
+    dsp_add(sigrifft_perform, 2, out1, n);
+}
+
+void rifft_tilde_setup(void)
+{
+    sigrifft_class = class_new(gensym("rifft~"), sigrifft_new, 0,
+        sizeof(t_sigrifft), 0, 0);
+    CLASS_MAINSIGNALIN(sigrifft_class, t_sigrifft, x_f);
+    class_addmethod(sigrifft_class, (t_method)sigrifft_dsp, gensym("dsp"), 0);
+    class_sethelpsymbol(sigrifft_class, gensym("fft~"));
+}