asterisk/codecs/ilbc/LPCdecode.h

 
/****************************************************************** 
 
    iLBC Speech Coder ANSI-C Source Code 
 
    LPC_decode.h      
 
    Copyright (c) 2001, 
    Global IP Sound AB. 
    All rights reserved. 
 
******************************************************************/ 
 
#ifndef __iLBC_LPC_DECODE_H 
#define __iLBC_LPC_DECODE_H 
 
void LSFinterpolate2a_dec(  
    float *a,           /* (o) lpc coefficients for a sub frame */ 
    float *lsf1,    /* (i) first lsf coefficient vector */ 
    float *lsf2,    /* (i) second lsf coefficient vector */ 
    float coef,         /* (i) interpolation weight */ 
    int length          /* (i) length of lsf vectors */ 
); 
       
void SimplelsfDEQ(  
    float *lsfdeq,      /* (o) dequantized lsf coefficients */ 
    int *index          /* (i) quantization index */ 
); 
 
void DecoderInterpolateLSF(  
    float *syntdenum,   /* (o) synthesis filter coefficients */ 
    float *weightdenum, /* (o) weighting denumerator  
                               coefficients */ 
    float *lsfdeq,      /* (i) dequantized lsf coefficients */ 
    int length,         /* (i) length of lsf coefficient vector */ 
    iLBC_Dec_Inst_t *iLBCdec_inst  
                        /* (i) the decoder state structure */ 
); 
 
#endif