libvoipcodecs  0.0.1
LPCdecode.h
1 /*
2  * iLBC - a library for the iLBC codec
3  *
4  * LPCdecode.h - The iLBC low bit rate speech codec.
5  *
6  * Adapted by Steve Underwood <steveu@coppice.org> from the reference
7  * iLBC code supplied in RFC3951.
8  *
9  * Original code Copyright (C) The Internet Society (2004).
10  * All changes to produce this version Copyright (C) 2008 by Steve Underwood
11  * All Rights Reserved.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16  *
17  * $Id: LPCdecode.h,v 1.2 2008/03/06 12:27:37 steveu Exp $
18  */
19 
20 #ifndef __iLBC_LPCDECODE_H
21 #define __iLBC_LPCDECODE_H
22 
23 void LSFinterpolate2a_dec(float *a, /* (o) lpc coefficients for a sub-frame */
24  float *lsf1, /* (i) first lsf coefficient vector */
25  float *lsf2, /* (i) second lsf coefficient vector */
26  float coef, /* (i) interpolation weight */
27  int length); /* (i) length of lsf vectors */
28 
29 void SimplelsfDEQ(float *lsfdeq, /* (o) dequantized lsf coefficients */
30  int *index, /* (i) quantization index */
31  int lpc_n); /* (i) number of LPCs */
32 
33 void DecoderInterpolateLSF(float *syntdenum, /* (o) synthesis filter coefficients */
34  float *weightdenum, /* (o) weighting denumerator coefficients */
35  float *lsfdeq, /* (i) dequantized lsf coefficients */
36  int length, /* (i) length of lsf coefficient vector */
37  ilbc_decode_state_t *iLBCdec_inst); /* (i) the decoder state structure */
38 
39 #endif
Definition: ilbc/ilbc.h:95