FreeCalypso > hg > gsm-codec-lib

view libtwamr/residu.h @ 605:63f774192906

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents a2351f2ad4f8
children
line wrap: on
line source

/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : residu.h
*      Purpose          : Computes the LP residual.
*      Description      : The LP residual is computed by filtering the input
*                       : speech through the LP inverse filter A(z).
*
*
********************************************************************************
*/
#ifndef residu_h
#define residu_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
 
void Residu (
    Word16 a[],        /* (i)  : prediction coefficients                    */
    Word16 x[],        /* (i)  : speech signal                              */
    Word16 y[],        /* (o)  : residual signal                            */
    Word16 lg          /* (i)  : size of filtering                          */
);
 
#endif