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view libtwamr/set_sign.h @ 605:63f774192906

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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 15c354f75110
children
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/*
********************************************************************************
*
*      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             : set_sign.h
*      Purpose          : Builds sign vector according to "dn[]" and "cn[]".
*
********************************************************************************
*/
/*
********************************************************************************
*                         MODULE INCLUDE FILE AND VERSION ID
********************************************************************************
*/
#ifndef set_sign_h
#define set_sign_h "@(#)$Id $"
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
void set_sign(Word16 dn[],   /* i/o : correlation between target and h[]    */
              Word16 sign[], /* o   : sign of dn[]                          */
              Word16 dn2[],  /* o   : maximum of correlation in each track. */
              Word16 n       /* i   : # of maximum correlations in dn2[]    */
);

void set_sign12k2 (
    Word16 dn[],      /* i/o : correlation between target and h[]         */
    Word16 cn[],      /* i   : residual after long term prediction        */
    Word16 sign[],    /* o   : sign of d[n]                               */
    Word16 pos_max[], /* o   : position of maximum correlation            */
    Word16 nb_track,  /* i   : number of tracks tracks                    */        
    Word16 ipos[],    /* o   : starting position for each pulse           */
    Word16 step       /* i   : the step size in the tracks                */        
);

#endif