This commit was generated by cvs2svn to compensate for changes in r3611,

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svn path=/trunk/externals/ekext/; revision=3612

1 files changed, 203 insertions, 0 deletions

diff --git a/lpc~/lpc_anal/lpc~.c b/lpc~/lpc_anal/lpc~.c
new file mode 100644
index 0000000..c9ad667
--- /dev/null
+++ b/lpc~/lpc_anal/lpc~.c
@@ -0,0 +1,203 @@
+/*  Linear Predictive Coding - PARCOR and residual generation
+ *  Copyright (C) 2005 Nicolas Chetry <okin@altern.org>
+ *  and 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>
+#define MAXPOLES 100
+
+static t_class *lpc_tilde_class;
+
+typedef struct _lpc_schur
+{
+  t_float *c_input, *c_residual;
+  /* just so we don't get clicks */
+  t_atom x_last_parcors[MAXPOLES];
+  t_atom x_parcors[MAXPOLES];
+} t_lpc_schur;
+
+typedef struct _lpc_tilde
+{
+  t_object x_obj;
+  t_float f_dummy;
+  t_float x_order, x_lastorder;
+  t_outlet *parcor_list;
+  t_lpc_schur x_schur;
+} t_lpc_tilde;
+
+t_int *lpc_tilde_perform(t_int *w)
+{
+  t_lpc_tilde     *x =     (t_lpc_tilde *)(w[1]);
+  t_lpc_schur *schur =     (t_lpc_schur *)(w[2]);
+  int              n =               (int)(w[3]);
+  t_float        *in = schur->c_input;
+  t_float       *res = schur->c_residual;
+//  t_float   *parcors = schur->PARCORS;
+//  t_float       *acf = schur->ACF;
+//  t_float         *k = schur->K;
+//  t_float         *p = schur->P;
+//  t_float         *r = schur->r;
+  t_int          ord = (int)x->x_order;
+  t_int        l_ord = (int)x->x_lastorder;
+//  t_float parcors[ord];
+  float acf[ord+1];
+  float k[ord+1];
+  float p[ord+1];
+  float r[ord+1];
+  float mem[ord];
+  int i, j, bid, y, z;
+  int g, h;
+  float tmp, temp, sav, di;
+  float parcor_1;  
+  for (i=0; i<ord; i++) 
+  {
+    SETFLOAT (&schur->x_parcors[i],0);
+    mem[i] = 0.0;
+  }
+  for (j=0; j<=ord; j++) 
+  {
+    acf[j] = 0;
+    for (i=j; i<n; i++) 
+	{
+	  acf[j] += in[i]*in[i-j];
+	}
+  }
+  if (acf[0] == 0) 
+  {
+    for (i=0; i<ord; i++)
+	{
+    SETFLOAT (&schur->x_parcors[i],0);
+	}
+  }
+  for (i=0; i<=ord; i++)
+  {
+    p[i]=acf[i];
+	if (i > 0 && i < ord)
+	{
+	  k[ord+1-i] = acf[i];
+	}
+  }
+  /* Schurr recursion */
+  for (y=1; y<=ord; y++)
+  {
+    if (p[0] < fabs (p[1]))
+	{
+	  for (i=y; i<=ord; i++)
+	  {
+	    r[i] = 0;
+	  }
+	  for (bid=1; bid <=ord; bid++)
+	  {
+            SETFLOAT (&schur->x_parcors[bid-1],r[bid]);
+	    //	    x->x_parcors[bid-1] = r[bid];
+	  }
+	}
+	r[y] = fabs(p[1])/p[0];
+	
+	if (p[1] >0)
+	{
+	  r[y] = -1.*r[y];
+	}
+	if (y==ord)
+	{
+	  for (bid=1; bid <=ord; bid++)
+	  {
+            SETFLOAT (&schur->x_parcors[bid-1],r[bid]);
+	    //	    x->x_parcors[bid-1] = r[bid];
+	  }
+	}
+	p[0] += p[1]*r[y];
+	
+	for (z=1; z <=ord-y; z++)
+	{
+	  p[z]        = p[z+1] + k[ord+1-z]*r[y];
+	  k[ord+1-z] += p[z+1] * r[y];
+	}
+  }
+  for (bid=1; bid <=ord; bid++)
+  {
+    SETFLOAT (&schur->x_parcors[bid-1],r[bid]);
+  }
+  parcor_1 = atom_getfloatarg(0,ord,schur->x_parcors); /* in order to avoid nil coefficients */
+  if (parcor_1 > 1e-5 || parcor_1 < -1e-5)
+    {
+      outlet_list(x->parcor_list,gensym("list"),ord,schur->x_parcors);
+
+  /* Analysis FIR lattice filtering */
+      for (g=0; g<n; g++)
+	{
+        
+    /* Analysis - Lattice structure */
+	  sav = di = in[g];
+	  for (i=0; i<ord; i++)
+	    {
+	      t_float parcor = atom_getfloatarg (i,ord,schur->x_parcors);
+	      SETFLOAT (&schur->x_last_parcors[i],parcor);
+	      x->x_lastorder = ord;
+	      temp = mem[i] + parcor*di;
+	      di += parcor*mem[i];
+	      mem[i] = sav;
+	      sav = temp;
+	    }
+	  res[g] = di;
+            
+	  }  /* next g */
+    }
+  else 
+    {
+      outlet_list(x->parcor_list,gensym("list"),l_ord,schur->x_last_parcors);
+      for (g=0; g<n; g++)
+	{
+	  res[g] = 0;
+	}
+    }
+  return(w+4);
+}
+
+void *lpc_tilde_dsp(t_lpc_tilde *x, t_signal **sp)
+{
+  x->x_schur.c_input = sp[0]->s_vec;
+  x->x_schur.c_residual = sp[1]->s_vec;
+  dsp_add(lpc_tilde_perform, 3, x, &x->x_schur, sp[0]->s_n);
+  return (void *)x;
+}
+
+void *lpc_tilde_new(t_floatarg f)
+{
+  t_lpc_tilde *x = (t_lpc_tilde *)pd_new(lpc_tilde_class);
+  x->x_order = f >= 1 ? (int)f : 5;
+  
+  floatinlet_new(&x->x_obj,&x->x_order);
+  outlet_new(&x->x_obj, &s_signal);
+  x->parcor_list = outlet_new(&x->x_obj, &s_list);
+  return (void *)x;
+}
+
+void lpc_tilde_setup(void)
+{
+  lpc_tilde_class = class_new(gensym("lpc~"), (t_newmethod)lpc_tilde_new, 0, sizeof(t_lpc_tilde), CLASS_DEFAULT, A_DEFFLOAT, 0);
+
+  post("\n. . Linear Predictive Coding. . . . . . . .");
+  post(". . PARCOR coefficients from input. . . . .");
+  post(". . by Nicolas Chetry <okin@altern.org> . .");
+  post(". & Edward Kelly <morph_2016@yahoo.co.uk> .");
+  
+  class_addmethod(lpc_tilde_class, (t_method)lpc_tilde_dsp, gensym("dsp"), 0);
+//  class_sethelpsymbol(lpc_tilde_class, gensym("help-lpc~"));
+  class_sethelpsymbol(lpc_tilde_class, gensym("lpc_test"));
+  CLASS_MAINSIGNALIN(lpc_tilde_class, t_lpc_tilde, f_dummy);
+}