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view libtwamr/spstproc.h @ 604:54f0f1b74c25

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libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 19:40:35 +0000
parents a37687c6ff22
children
line wrap: on
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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             : subframePostProc.h
*      Purpose          : Subframe post processing
*
********************************************************************************
*/
#ifndef spstproc_h
#define spstproc_h "$Id $"

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

/*
********************************************************************************
*                         LOCAL VARIABLES AND TABLES
********************************************************************************
*/

/*
********************************************************************************
*                         PUBLIC PROGRAM CODE
********************************************************************************
*/

int subframePostProc(
    Word16 *speech,   /* i   : speech segment                        */
    enum Mode mode,   /* i   : coder mode                            */
    Word16 i_subfr,   /* i   : Subframe nr                           */
    Word16 gain_pit,  /* i   : Pitch gain                       Q14  */
    Word16 gain_code, /* i   : Decoded innovation gain               */
    Word16 *Aq,       /* i   : A(z) quantized for the 4 subframes    */
    Word16 synth[],   /* i   : Local snthesis                        */
    Word16 xn[],      /* i   : Target vector for pitch search        */
    Word16 code[],    /* i   : Fixed codebook exitation              */
    Word16 y1[],      /* i   : Filtered adaptive exitation           */
    Word16 y2[],      /* i   : Filtered fixed codebook excitation    */
    Word16 *mem_syn,  /* i/o : memory of synthesis filter            */
    Word16 *mem_err,  /* o   : pointer to error signal               */
    Word16 *mem_w0,   /* o   : memory of weighting filter            */
    Word16 *exc,      /* o   : long term prediction residual         */
    Word16 *sharp     /* o   : pitch sharpening value                */
);

#endif