Include iLBC source code for distribution with Asterisk

This patch includes the iLBC source code for distribution with Asterisk.
Clarification regarding the iLBC source code was provided by Google, and
the appropriate licenses have been included in the codecs/ilbc folder.

Review: https://reviewboard.asterisk.org/r/1675
Review: https://reviewboard.asterisk.org/r/1649

(closes issue: ASTERISK-18943)
Reporter: Leif Madsen
Tested by: Matt Jordan
........

Merged revisions 351450 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 351451 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@351452 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 106 insertions, 0 deletions

diff --git a/codecs/ilbc/helpfun.h b/codecs/ilbc/helpfun.h
new file mode 100644
index 000000000..931ca68a6
--- /dev/null
+++ b/codecs/ilbc/helpfun.h
@@ -0,0 +1,106 @@
+
+   /******************************************************************
+
+       iLBC Speech Coder ANSI-C Source Code
+
+       helpfun.h
+
+       Copyright (C) The Internet Society (2004).
+       All Rights Reserved.
+
+   ******************************************************************/
+
+   #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
+