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view libtwamr/pstfilt.h @ 602:72cdae602d6e

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libgsmhr1/dec_func.c: rm unused static functions In the original code, sp_dec.c held two kinds of functions: those needed only as part of the decoder, and those used by both decoder and encoder engines. In this library, we have moved the latter class of functions to dec_func.c module. Almost all static functions from the original sp_dec.c, with the exception of aToRc(), are needed only on sp_dec.c side of the new divide - remove them from dec_func.c, where they became dead code.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 18:58:22 +0000
parents 59655481e45b
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             : pstfilt.h
*      Purpose          : Performs adaptive postfiltering on the synthesis
*                       : speech
*
********************************************************************************
*/
#ifndef pstfilt_h
#define pstfilt_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "tw_amr.h"
#include "typedef.h"
#include "cnst.h"
#include "preemph.h"
#include "agc.h"
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
typedef struct{
  Word16 res2[L_SUBFR];
  Word16 mem_syn_pst[M];
  preemphasisState preemph_state;
  agcState agc_state;
  Word16 synth_buf[M + L_FRAME];  
} Post_FilterState;

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
 
void Post_Filter_reset (Post_FilterState *st);
/* reset post filter (i.e. set state memory to zero)
   returns 0 on success
 */

int Post_Filter (
    Post_FilterState *st, /* i/o : post filter states                        */
    enum Mode mode,       /* i   : AMR mode                                  */
    Word16 *syn,          /* i/o : synthesis speech (postfiltered is output) */
    Word16 *Az_4          /* i   : interpolated LPC parameters in all subfr. */
);
/* filters the signal syn using the parameters in Az_4 to calculate filter
   coefficients.
   The filter must be set up using Post_Filter_init prior to the first call
   to Post_Filter. Post_FilterState is updated to mirror the current state
   of the filter
 
   return 0 on success
 */
 
#endif