diff options
| author | Hans-Christoph Steiner <eighthave@users.sourceforge.net> | 2006-01-09 21:24:28 +0000 |
|---|---|---|
| committer | Hans-Christoph Steiner <eighthave@users.sourceforge.net> | 2006-01-09 21:24:28 +0000 |
| commit | d449d31030cfc4a3e06858bf877dcbfacad59f74 (patch) | |
| tree | e7d5c4b2359fdb7e7727c3ea72ca250ca5275e2d /source/decimate~.c | |
checked in code from sIgpAck0.03.ZIP; cleaned up comment warnings and changed #ifdef NT to #ifdef _MSC_VER; removed sp. prefix and set up for namespacessvn2git-root
svn path=/trunk/externals/sigpack/; revision=4381
Diffstat (limited to 'source/decimate~.c')
| -rw-r--r-- | source/decimate~.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/source/decimate~.c b/source/decimate~.c new file mode 100644 index 0000000..b7fb073 --- /dev/null +++ b/source/decimate~.c @@ -0,0 +1,76 @@ +/* sIgpAck
+ * for
+ * pure-data
+ * www.weiss-archiv.de */
+
+#include "m_pd.h"
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+// ------------------------ sp.decimate~ -----------------------------
+// signal decimation
+// code from musicdsp.org posted by tobybear
+
+static t_class *decimate_tilde_class;
+
+typedef struct _decimate_tilde
+{
+ t_object x_obj;
+ t_sample x_rate;
+ t_sample x_bits;
+ float x_f;
+} t_decimate_tilde;
+
+static void *decimate_tilde_new(t_floatarg rate, t_floatarg bits)
+{
+ t_decimate_tilde *x = (t_decimate_tilde *)pd_new(decimate_tilde_class);
+ x->x_rate = rate;
+ x->x_bits = bits;
+ outlet_new(&x->x_obj, gensym("signal"));
+ floatinlet_new(&x->x_obj, &x->x_rate);
+ floatinlet_new(&x->x_obj, &x->x_bits);
+ x->x_f = 0;
+ if (rate) x->x_rate = rate;
+ else x->x_rate = 0.5;
+ if (bits) x->x_bits = bits;
+ else x->x_bits = 16;
+ return (x);
+}
+
+static t_int *decimate_tilde_perform(t_int *w)
+{
+ t_decimate_tilde *x = (t_decimate_tilde *)(w[1]);
+ t_float *in = (t_float *)(w[2]);
+ t_float *out = (t_float *)(w[3]);
+ int n = (int)(w[4]);
+ float f;
+ long int m=1<<(int)(x->x_bits-1);
+ float y=0, cnt=0;
+ while (n--)
+ {
+ f = *in++;
+ cnt+=x->x_rate;
+ if (cnt>=1)
+ {
+ cnt-=1;
+ y=(long int)(f*m)/(float)m;
+ }
+ *out++ = y;
+ }
+ return (w+5);
+}
+
+static void decimate_tilde_dsp(t_decimate_tilde *x, t_signal **sp)
+{
+ dsp_add(decimate_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void decimate_tilde_setup(void)
+{
+ decimate_tilde_class = class_new(gensym("sp.decimate~"), (t_newmethod)decimate_tilde_new, 0,
+ sizeof(t_decimate_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ CLASS_MAINSIGNALIN(decimate_tilde_class, t_decimate_tilde, x_f);
+ class_addmethod(decimate_tilde_class, (t_method)decimate_tilde_dsp, gensym("dsp"), 0);
+}
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