Version 0.1.2 from FTP

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@169 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 133 insertions, 0 deletions

diff --git a/codecs/lpc10/irc2pc.c b/codecs/lpc10/irc2pc.c
new file mode 100755
index 000000000..040653938
--- /dev/null
+++ b/codecs/lpc10/irc2pc.c
@@ -0,0 +1,133 @@
+/*
+
+$Log$
+Revision 1.1  2000/01/05 08:20:39  markster
+Version 0.1.2 from FTP
+
+Revision 1.2  2000/01/05 08:20:39  markster
+Some OSS fixes and a few lpc changes to make it actually work
+
+ * Revision 1.1  1996/08/19  22:31:56  jaf
+ * Initial revision
+ *
+
+*/
+
+#ifdef P_R_O_T_O_T_Y_P_E_S
+extern int irc2pc_(real *rc, real *pc, integer *order, real *gprime, real *g2pass);
+#endif
+
+/*  -- translated by f2c (version 19951025).
+   You must link the resulting object file with the libraries:
+	-lf2c -lm   (in that order)
+*/
+
+#include "f2c.h"
+
+/* ***************************************************************** */
+
+/* 	IRC2PC Version 48 */
+
+/* $Log$
+ * Revision 1.1  2000/01/05 08:20:39  markster
+ * Version 0.1.2 from FTP
+ *
+/* Revision 1.2  2000/01/05 08:20:39  markster
+/* Some OSS fixes and a few lpc changes to make it actually work
+/*
+ * Revision 1.1  1996/08/19  22:31:56  jaf
+ * Initial revision
+ * */
+/* Revision 1.3  1996/03/20  15:47:19  jaf */
+/* Added comments about which indices of array arguments are read or */
+/* written. */
+
+/* Revision 1.2  1996/03/14  16:59:04  jaf */
+/* Comments added explaining that none of the local variables of this */
+/* subroutine need to be saved from one invocation to the next. */
+
+/* Revision 1.1  1996/02/07 14:47:27  jaf */
+/* Initial revision */
+
+
+/* ***************************************************************** */
+
+/*   Convert Reflection Coefficients to Predictor Coeficients */
+
+/* Inputs: */
+/*  RC     - Reflection coefficients */
+/*           Indices 1 through ORDER read. */
+/*  ORDER  - Number of RC's */
+/*  GPRIME - Excitation modification gain */
+/* Outputs: */
+/*  PC     - Predictor coefficients */
+/*           Indices 1 through ORDER written. */
+/*           Indices 1 through ORDER-1 are read after being written. */
+/*  G2PASS - Excitation modification sharpening factor */
+
+/* This subroutine has no local state. */
+
+/* Subroutine */ int irc2pc_(real *rc, real *pc, integer *order, real *gprime,
+	 real *g2pass)
+{
+    /* System generated locals */
+    integer i__1, i__2;
+
+    /* Builtin functions */
+    double sqrt(doublereal);
+
+    /* Local variables */
+    real temp[10];
+    integer i__, j;
+
+/* 	Arguments */
+/* $Log$
+ * Revision 1.1  2000/01/05 08:20:39  markster
+ * Version 0.1.2 from FTP
+ *
+/* Revision 1.2  2000/01/05 08:20:39  markster
+/* Some OSS fixes and a few lpc changes to make it actually work
+/*
+ * Revision 1.1  1996/08/19  22:31:56  jaf
+ * Initial revision
+ * */
+/* Revision 1.3  1996/03/29  22:03:47  jaf */
+/* Removed definitions for any constants that were no longer used. */
+
+/* Revision 1.2  1996/03/26  19:34:33  jaf */
+/* Added comments indicating which constants are not needed in an */
+/* application that uses the LPC-10 coder. */
+
+/* Revision 1.1  1996/02/07  14:43:51  jaf */
+/* Initial revision */
+
+/*   LPC Configuration parameters: */
+/* Frame size, Prediction order, Pitch period */
+/*       Local variables that need not be saved */
+    /* Parameter adjustments */
+    --pc;
+    --rc;
+
+    /* Function Body */
+    *g2pass = 1.f;
+    i__1 = *order;
+    for (i__ = 1; i__ <= i__1; ++i__) {
+	*g2pass *= 1.f - rc[i__] * rc[i__];
+    }
+    *g2pass = *gprime * sqrt(*g2pass);
+    pc[1] = rc[1];
+    i__1 = *order;
+    for (i__ = 2; i__ <= i__1; ++i__) {
+	i__2 = i__ - 1;
+	for (j = 1; j <= i__2; ++j) {
+	    temp[j - 1] = pc[j] - rc[i__] * pc[i__ - j];
+	}
+	i__2 = i__ - 1;
+	for (j = 1; j <= i__2; ++j) {
+	    pc[j] = temp[j - 1];
+	}
+	pc[i__] = rc[i__];
+    }
+    return 0;
+} /* irc2pc_ */
+