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view libtwamr/inter_36.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 838ed426bb76
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             : inter_36.h
*      Purpose          : Interpolating the normalized correlation
*                       : with 1/3 or 1/6 resolution.
*
********************************************************************************
*/
#ifndef inter_36_h
#define inter_36_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
Word16 Interpol_3or6 (  /* (o)  : interpolated value                        */
    Word16 *x,          /* (i)  : input vector                              */
    Word16 frac,        /* (i)  : fraction  (-2..2 for 3*, -3..3 for 6*)    */
    Word16 flag3        /* (i)  : if set, upsampling rate = 3 (6 otherwise) */
);
 
#endif