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view libtwamr/ton_stab.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 8fff74ca83e8
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             : ton_stab.h
*      Purpose          : Tone stabilization routines 
*
********************************************************************************
*/
#ifndef ton_stab_h
#define ton_stab_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "tw_amr.h"
#include "typedef.h"
#include "cnst.h"

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

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

/* state variable */
typedef struct {

   /* counters */
   Word16 count;
   
   /* gain history Q11 */
   Word16 gp[N_FRAME];
   
} tonStabState;

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

Word16 check_lsp(tonStabState *st, /* i/o : State struct            */
                 Word16 *lsp       /* i   : unquantized LSP's       */
);

Word16 check_gp_clipping(tonStabState *st, /* i/o : State struct            */
                         Word16 g_pitch    /* i   : pitch gain              */
);

void update_gp_clipping(tonStabState *st, /* i/o : State struct            */
                        Word16 g_pitch    /* i   : pitch gain              */
);

#endif