swap to new ilbc library

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12095 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/ilbc/src/helpfun.h

@@ -0,0 +1,80 @@
+/*
+ * iLBC - a library for the iLBC codec
+ *
+ * helpfun.h - The iLBC low bit rate speech codec.
+ *
+ * Adapted by Steve Underwood <steveu@coppice.org> from the reference
+ * iLBC code supplied in RFC3951.
+ *
+ * Original code Copyright (C) The Internet Society (2004).
+ * All changes to produce this version Copyright (C) 2008 by Steve Underwood
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * $Id: helpfun.h,v 1.2 2008/03/06 12:27:38 steveu Exp $
+ */
+
+#ifndef __iLBC_HELPFUN_H
+#define __iLBC_HELPFUN_H
+
+void autocorr(float *r,         /* (o) autocorrelation vector */
+              const float *x,   /* (i) data vector */
+              int N,            /* (i) length of data vector */
+              int order);       /* largest lag for calculated
+                                 autocorrelations */
+
+void window(float *z,           /* (o) the windowed data */
+            const float *x,     /* (i) the original data vector */
+            const float *y,     /* (i) the window */
+            int N);             /* (i) length of all vectors */
+
+void levdurb(float *a,          /* (o) lpc coefficient vector starting with 1.0 */
+             float *k,          /* (o) reflection coefficients */
+             float *r,          /* (i) autocorrelation vector */
+             int order);        /* (i) order of lpc filter */
+
+void interpolate(float *out,    /* (o) the interpolated vector */
+                 float *in1,    /* (i) the first vector for the
+                                       interpolation */
+                 float *in2,    /* (i) the second vector for the
+                                       interpolation */
+                 float coef,    /* (i) interpolation weights */
+                 int length);   /* (i) length of all vectors */
+
+void bwexpand(float *out,       /* (o) the bandwidth expanded lpc coefficients */
+              float *in,        /* (i) the lpc coefficients before bandwidth
+                                       expansion */
+              float coef,       /* (i) the bandwidth expansion factor */
+              int length);      /* (i) the length of lpc coefficient vectors */
+
+void vq(float *Xq,              /* (o) the quantized vector */
+        int *index,             /* (o) the quantization index */
+        const float *CB,        /* (i) the vector quantization codebook */
+        float *X,               /* (i) the vector to quantize */
+        int n_cb,               /* (i) the number of vectors in the codebook */
+        int dim);               /* (i) the dimension of all vectors */
+
+void SplitVQ(float *qX,             /* (o) the quantized vector */
+             int *index,            /* (o) a vector of indexes for all vector
+                                           codebooks in the split */
+             float *X,              /* (i) the vector to quantize */
+             const float *CB,       /* (i) the quantizer codebook */
+             int nsplit,            /* the number of vector splits */
+             const int *dim,        /* the dimension of X and qX */
+             const int *cbsize);    /* the number of vectors in the codebook */
+
+void sort_sq(float *xq,         /* (o) the quantized value */
+             int *index,        /* (o) the quantization index */
+             float x,           /* (i) the value to quantize */
+             const float *cb,   /* (i) the quantization codebook */
+             int cb_size);      /* (i) the size of the quantization codebook */
+
+int LSF_check(                  /* (o) 1 for stable lsf vectors and 0 for nonstable ones */
+              float *lsf,       /* (i) a table of lsf vectors */
+              int dim,          /* (i) the dimension of each lsf vector */
+              int NoAn);        /* (i) the number of lsf vectors in the table */
+
+#endif