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view libtwamr/log2.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 bfe74a9edd5a
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             : log2.h
*      Purpose          : Computes log2(L_x)
*
********************************************************************************
*/
#ifndef log2_h
#define log2_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
void Log2 (
    Word32 L_x,        /* (i) : input value                                 */
    Word16 *exponent,  /* (o) : Integer part of Log2.   (range: 0<=val<=30) */
    Word16 *fraction   /* (o) : Fractional part of Log2. (range: 0<=val<1)*/
);

void Log2_norm (
    Word32 L_x,         /* (i) : input value (normalized)                    */
    Word16 exp,         /* (i) : norm_l (L_x)                                */
    Word16 *exponent,   /* (o) : Integer part of Log2.   (range: 0<=val<=30) */
    Word16 *fraction    /* (o) : Fractional part of Log2. (range: 0<=val<1)  */
);

#endif