81 lines
3.9 KiB
C
81 lines
3.9 KiB
C
/*
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* iLBC - a library for the iLBC codec
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*
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* helpfun.h - The iLBC low bit rate speech codec.
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*
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* Adapted by Steve Underwood <steveu@coppice.org> from the reference
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* iLBC code supplied in RFC3951.
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*
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* Original code Copyright (C) The Internet Society (2004).
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* All changes to produce this version Copyright (C) 2008 by Steve Underwood
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* All Rights Reserved.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: helpfun.h,v 1.2 2008/03/06 12:27:38 steveu Exp $
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*/
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#ifndef __iLBC_HELPFUN_H
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#define __iLBC_HELPFUN_H
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void autocorr(float *r, /* (o) autocorrelation vector */
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const float *x, /* (i) data vector */
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int N, /* (i) length of data vector */
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int order); /* largest lag for calculated
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autocorrelations */
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void window(float *z, /* (o) the windowed data */
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const float *x, /* (i) the original data vector */
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const float *y, /* (i) the window */
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int N); /* (i) length of all vectors */
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void levdurb(float *a, /* (o) lpc coefficient vector starting with 1.0 */
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float *k, /* (o) reflection coefficients */
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float *r, /* (i) autocorrelation vector */
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int order); /* (i) order of lpc filter */
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void interpolate(float *out, /* (o) the interpolated vector */
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float *in1, /* (i) the first vector for the
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interpolation */
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float *in2, /* (i) the second vector for the
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interpolation */
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float coef, /* (i) interpolation weights */
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int length); /* (i) length of all vectors */
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void bwexpand(float *out, /* (o) the bandwidth expanded lpc coefficients */
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float *in, /* (i) the lpc coefficients before bandwidth
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expansion */
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float coef, /* (i) the bandwidth expansion factor */
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int length); /* (i) the length of lpc coefficient vectors */
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void vq(float *Xq, /* (o) the quantized vector */
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int *index, /* (o) the quantization index */
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const float *CB, /* (i) the vector quantization codebook */
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float *X, /* (i) the vector to quantize */
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int n_cb, /* (i) the number of vectors in the codebook */
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int dim); /* (i) the dimension of all vectors */
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void SplitVQ(float *qX, /* (o) the quantized vector */
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int *index, /* (o) a vector of indexes for all vector
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codebooks in the split */
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float *X, /* (i) the vector to quantize */
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const float *CB, /* (i) the quantizer codebook */
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int nsplit, /* the number of vector splits */
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const int *dim, /* the dimension of X and qX */
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const int *cbsize); /* the number of vectors in the codebook */
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void sort_sq(float *xq, /* (o) the quantized value */
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int *index, /* (o) the quantization index */
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float x, /* (i) the value to quantize */
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const float *cb, /* (i) the quantization codebook */
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int cb_size); /* (i) the size of the quantization codebook */
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int LSF_check( /* (o) 1 for stable lsf vectors and 0 for nonstable ones */
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float *lsf, /* (i) a table of lsf vectors */
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int dim, /* (i) the dimension of each lsf vector */
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int NoAn); /* (i) the number of lsf vectors in the table */
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#endif
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