bmt~ is a spectral band measurement tool

svn path=/trunk/externals/ekext/; revision=14769

2 files changed, 438 insertions, 0 deletions

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+#X text 20 213 This will rescale the inputs so that they automatically
+span the range -100 to 0 Since bass frequencies are usually louder
+than treble \, this is useful in order to make the bands consistent
+with one another in their output.;
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+#X text 400 192 <--- alpha (magnitude) of loudest bin;
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+#X text 160 139 <--- [rfft~] and [bmt~] are in here!;
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+#X text 278 104 <--- mode 0 is maximum magnitude bin in the band \,
+mode 1 is sum of all fft bins in the band.;
+#X msg 52 43 \; pd dsp 1;
+#X text 237 309 Splits a spectral analysis [rfft~] into n bands \,
+where n is the creation argument (default 3 \, range 2-128). Reports
+the maximum bin magnitude and its corresponding bin number for each
+band.;
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+bin;
+#X text 290 433 <--- smoothing (optional);
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diff --git a/bmt~.c b/bmt~.c
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+++ b/bmt~.c
@@ -0,0 +1,157 @@
+/*
+ *  bmt~ : bassmidtreble, according to threshold 
+ *  Copyright (C) 2010 Edward Kelly <morph_2016@yahoo.co.uk>
+ *
+ *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "m_pd.h"
+#include <math.h>
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+static t_class *bmt_tilde_class;
+
+typedef struct _bmt_tilde 
+{
+  t_object x_obj;
+  t_atom levels[128]; // a ridiculous number of bands!!!
+  t_atom binmost[128];
+  //  t_atom xovers[127]; // and their crossover band points.
+  // Make this so the bands can be log! or pow x!
+
+  t_float f;
+  t_float mode;
+  t_float length; // how many do we have?
+  t_outlet *bmt, *bins;
+} t_bmt_tilde;
+
+t_int *bmt_tilde_perform(t_int *w)
+{
+  t_bmt_tilde  *x =  (t_bmt_tilde *)(w[1]);
+  t_sample  *real =     (t_sample *)(w[2]);
+  t_sample  *imag =     (t_sample *)(w[3]);
+  int           n =            (int)(w[4]);
+  float incr = 0;
+  float max = 0;
+  float vectorr, vectori;
+  float alpha;
+  int n_real = n / 2;
+  float bsize = n_real / x->length;
+  float block = 0;
+  float reblock = 0;
+  int ilength = (int)(x->length);
+  int iblock = 0;
+
+  while (n--)
+    {
+      vectorr = (*real++);
+      vectori = (*imag++);
+      if (n > n_real)
+	{
+	  if (x->mode == 0)
+	    {
+	      reblock = block;
+	      alpha = sqrt((vectorr * vectorr) + (vectori * vectori));
+	      block = (int)(incr / bsize);
+	      iblock = (int)(block);
+	      if (block != reblock)
+		{
+		  max = alpha;
+		}
+	      else if (alpha > max)
+		{
+		  max = alpha;
+		  SETFLOAT(&x->levels[iblock], max);
+		  SETFLOAT(&x->binmost[iblock], incr-((int)(block*bsize)));
+		}
+	    }
+	  else if (x->mode == 1)
+	    {
+	      reblock = block;
+	      alpha = sqrt((vectorr * vectorr) + (vectori * vectori));
+	      block = (int)(incr / bsize);
+	      iblock = (int)(block);
+	      if (block != reblock)
+		{
+		  max = alpha;
+		}
+	      else if (block == reblock)
+		{
+		  max += alpha;
+		  SETFLOAT(&x->levels[iblock], max);
+		  SETFLOAT(&x->binmost[iblock], incr-((int)(block*bsize)));
+		}
+	    }
+      } 
+      incr++;
+    }
+  outlet_list(x->bins, gensym("list"), ilength, x->binmost);
+  outlet_list(x->bmt, gensym("list"), ilength, x->levels);
+  //outlet_list(x->f_levs, (float)max);
+  //outlet_list(x->f_bmt, x->f_topbin);
+
+  return(w+5);
+}
+
+void bmt_tilde_mode(t_bmt_tilde *x, t_floatarg n)
+{
+  x->mode = n;
+}
+
+void bmt_tilde_dsp(t_bmt_tilde *x, t_signal **sp)
+{
+  dsp_add(bmt_tilde_perform, 4, x,
+	  sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void *bmt_tilde_new(t_floatarg nbands)
+{
+  t_bmt_tilde *x = (t_bmt_tilde *)pd_new(bmt_tilde_class);
+
+  x->length = nbands > 1 ? nbands > 128 ? 128 : nbands : 3;
+  // set min max nbands
+  inlet_new (&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  //  floatinlet_new (&x->x_obj, &x->f_thresh);
+  int i;
+  x->mode = 0; //make this a creation arg...Ed
+  for(i=0;i<128;i++)
+    {
+	  SETFLOAT(&x->levels[i], 0);
+	  SETFLOAT(&x->binmost[i], 0);
+    }
+  x->bmt = outlet_new(&x->x_obj, gensym("list"));
+  x->bins = outlet_new(&x->x_obj, gensym("list"));
+  return (void *)x;
+}
+
+void bmt_tilde_setup(void)
+{
+  bmt_tilde_class = class_new(gensym("bmt~"),
+				     (t_newmethod)bmt_tilde_new,
+				     0, sizeof(t_bmt_tilde),
+				     CLASS_DEFAULT, A_DEFFLOAT, 0);
+
+  post("|=======bmt~========|");
+  post("|=bass==mid==treble=|");
+  post("|=ed==kelly===2010==|");
+
+  class_addmethod(bmt_tilde_class, (t_method)bmt_tilde_dsp,
+		  gensym("dsp"), 0);
+  class_addmethod(bmt_tilde_class, (t_method)bmt_tilde_mode, gensym("mode"), A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(bmt_tilde_class, t_bmt_tilde, f);
+}