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view libtwamr/cl_ltp.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 85e9768d497f
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             : cl_ltp.h
*      Purpose          : Closed-loop fractional pitch search
*
********************************************************************************
*/
#ifndef cl_ltp_h
#define cl_ltp_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "tw_amr.h"
#include "typedef.h"
#include "pitch_fr.h"
#include "ton_stab.h"

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

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

/* state variable */
typedef struct {
    Pitch_frState pitchSt;
} clLtpState;

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
 
void cl_ltp_reset (clLtpState *st);
/* reset of pre processing state (i.e. set state memory to zero)
   returns 0 on success
 */

int cl_ltp(
    clLtpState *clSt,    /* i/o : State struct                              */
    tonStabState *tonSt, /* i/o : State struct                              */
    enum Mode mode,      /* i   : coder mode                                */
    Word16 frameOffset,  /* i   : Offset to subframe                        */
    Word16 T_op[],       /* i   : Open loop pitch lags                      */
    Word16 *h1,          /* i   : Impulse response vector               Q12 */
    Word16 *exc,         /* i/o : Excitation vector                      Q0 */
    Word16 res2[],       /* i/o : Long term prediction residual          Q0 */
    Word16 xn[],         /* i   : Target vector for pitch search         Q0 */
    Word16 lsp_flag,     /* i   : LSP resonance flag                        */
    Word16 xn2[],        /* o   : Target vector for codebook search      Q0 */
    Word16 y1[],         /* o   : Filtered adaptive excitation           Q0 */
    Word16 *T0,          /* o   : Pitch delay (integer part)                */
    Word16 *T0_frac,     /* o   : Pitch delay (fractional part)             */
    Word16 *gain_pit,    /* o   : Pitch gain                            Q14 */
    Word16 g_coeff[],    /* o   : Correlations between xn, y1, & y2         */
    Word16 **anap,       /* o   : Analysis parameters                       */
    Word16 *gp_limit     /* o   : pitch gain limit                          */
);

#endif