refactored d_fft.c and d_math.c into separate objectclases

svn path=/trunk/; revision=14683

1 files changed, 68 insertions, 0 deletions

diff --git a/externals/vanilla/rfft~.c b/externals/vanilla/rfft~.c
new file mode 100644
index 00000000..5012f750
--- /dev/null
+++ b/externals/vanilla/rfft~.c
@@ -0,0 +1,68 @@
+/* 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 *sigrfft_class;
+
+typedef struct rfft
+{
+    t_object x_obj;
+    t_float x_f;
+} t_sigrfft;
+
+static void *sigrfft_new(void)
+{
+    t_sigrfft *x = (t_sigrfft *)pd_new(sigrfft_class);
+    outlet_new(&x->x_obj, gensym("signal"));
+    outlet_new(&x->x_obj, gensym("signal"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *sigrfft_perform(t_int *w)
+{
+    t_sample *in = (t_sample *)(w[1]);
+    int n = w[2];
+    mayer_realfft(n, in);
+    return (w+3);
+}
+
+static void sigrfft_dsp(t_sigrfft *x, t_signal **sp)
+{
+    int n = sp[0]->s_n, n2 = (n>>1);
+    t_sample *in1 = sp[0]->s_vec;
+    t_sample *out1 = sp[1]->s_vec;
+    t_sample *out2 = sp[2]->s_vec;
+    if (n < 4)
+    {
+        error("fft: minimum 4 points");
+        return;
+    }
+    if (in1 != out1)
+        dsp_add(copy_perform, 3, in1, out1, n);
+    dsp_add(sigrfft_perform, 2, out1, n);
+    dsp_add(sigrfft_flip, 3, out1 + (n2+1), out2 + n2, n2-1);
+    dsp_add_zero(out1 + (n2+1), ((n2-1)&(~7)));
+    dsp_add_zero(out1 + (n2+1) + ((n2-1)&(~7)), ((n2-1)&7));
+    dsp_add_zero(out2 + n2, n2);
+    dsp_add_zero(out2, 1);
+}
+
+void rfft_tilde_setup(void)
+{
+    sigrfft_class = class_new(gensym("rfft~"), sigrfft_new, 0,
+        sizeof(t_sigrfft), 0, 0);
+    CLASS_MAINSIGNALIN(sigrfft_class, t_sigrfft, x_f);
+    class_addmethod(sigrfft_class, (t_method)sigrfft_dsp, gensym("dsp"), 0);
+    class_sethelpsymbol(sigrfft_class, gensym("fft~"));
+}