view libtwamr/lsp_avg.h @ 428:ffd87f972f86

libtwamr: implement TXFrameType to RXFrameType conversion
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 07 May 2024 22:15:23 +0000
parents 9cd332a94c97
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             : lsp_avg.h
*      Purpose:         : LSP averaging and history
*                         The LSPs are averaged over 8 frames
*
********************************************************************************
*/
#ifndef lsp_avg_h
#define lsp_avg_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
#include "cnst.h"

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

#define EXPCONST          5243               /* 0.16 in Q15 */
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
typedef struct {
  Word16 lsp_meanSave[M];          /* Averaged LSPs saved for efficiency  */
} lsp_avgState;
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/

/*
**************************************************************************
*
*  Function    : lsp_history_reset
*  Purpose     : Resets state memory
*
**************************************************************************
*/
void lsp_avg_reset (
    lsp_avgState *state
);
 
/*
**************************************************************************
*
*  Function    : lsp_avg
*  Purpose     : Calculate the LSP averages
*
**************************************************************************
*/
void lsp_avg (
    lsp_avgState *st,     /* i/o : State struct                 Q15 */
    Word16 *lsp           /* i   : LSP vector                   Q15 */
);
#endif