LPCdecode.h

00001 /*
00002  * iLBC - a library for the iLBC codec
00003  *
00004  * LPCdecode.h - The iLBC low bit rate speech codec.
00005  *
00006  * Adapted by Steve Underwood <steveu@coppice.org> from the reference
00007  * iLBC code supplied in RFC3951.
00008  *
00009  * Original code Copyright (C) The Internet Society (2004).
00010  * All changes to produce this version Copyright (C) 2008 by Steve Underwood
00011  * All Rights Reserved.
00012  *
00013  * This program is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00016  *
00017  * $Id: LPCdecode.h,v 1.2 2008/03/06 12:27:37 steveu Exp $
00018  */
00019 
00020 #ifndef __iLBC_LPCDECODE_H
00021 #define __iLBC_LPCDECODE_H
00022 
00023 void LSFinterpolate2a_dec(float *a,         /* (o) lpc coefficients for a sub-frame */
00024                           float *lsf1,      /* (i) first lsf coefficient vector */
00025                           float *lsf2,      /* (i) second lsf coefficient vector */
00026                           float coef,       /* (i) interpolation weight */
00027                           int length);      /* (i) length of lsf vectors */
00028 
00029 void SimplelsfDEQ(float *lsfdeq,            /* (o) dequantized lsf coefficients */
00030                   int *index,               /* (i) quantization index */
00031                   int lpc_n);               /* (i) number of LPCs */
00032 
00033 void DecoderInterpolateLSF(float *syntdenum,                    /* (o) synthesis filter coefficients */
00034                            float *weightdenum,                  /* (o) weighting denumerator coefficients */
00035                            float *lsfdeq,                       /* (i) dequantized lsf coefficients */
00036                            int length,                          /* (i) length of lsf coefficient vector */
00037                            ilbc_decode_state_t *iLBCdec_inst);  /* (i) the decoder state structure */
00038 
00039 #endif

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