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view libtwamr/a_refl.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 54f6bc41ed10
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             : a_refl.h
*      Purpose          : Convert from direct form coefficients to 
*                         reflection coefficients
*
********************************************************************************
*/
#ifndef a_refl_h
#define a_refl_h "$Id $"

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/

/*************************************************************************
 *
 *   FUNCTION:  A_Refl()
 *
 *   PURPOSE: Convert from direct form coefficients to reflection coefficients
 *
 *   DESCRIPTION:
 *       Directform coeffs in Q12 are converted to 
 *       reflection coefficients Q15 
 *
 *************************************************************************/
void A_Refl(
   Word16 a[],	      /* i   : Directform coefficients */
   Word16 refl[]      /* o   : Reflection coefficients */
);

#endif