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view libtwamr/dec_gain.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 5ccfe176bae1
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             : dec_gain.h
*      Purpose          : Decode the pitch and codebook gains
*
********************************************************************************
*/
#ifndef dec_gain_h
#define dec_gain_h "$Id $"

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

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

/*************************************************************************
 *
 *   FUNCTION:  Dec_gain()
 *
 *   PURPOSE: Decode the pitch and codebook gains
 *
 ************************************************************************/
void Dec_gain(
    gc_predState *pred_state, /* i/o: MA predictor state           */
    enum Mode mode,           /* i  : AMR mode                     */
    Word16 index,             /* i  : index of quantization.       */
    Word16 code[],            /* i  : Innovative vector.           */
    Word16 evenSubfr,         /* i  : Flag for even subframes      */     
    Word16 * gain_pit,        /* o  : Pitch gain.                  */
    Word16 * gain_cod         /* o  : Code gain.                   */
);

#endif