ec_gains.h

arm音频编解码库

/*
********************************************************************************
*
*      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             : ec_gains.h
*      Purpose:         : Error concealment for pitch and codebook gains
*
********************************************************************************
*/
#ifndef ec_gains_h
#define ec_gains_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
#include "gc_pred.h"

/*
********************************************************************************
*                         LOCAL VARIABLES AND TABLES
********************************************************************************
*/
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
typedef struct {
  Word16 pbuf[5];
  Word16 past_gain_pit;
  Word16 prev_gp;
} ec_gain_pitchState;
 
typedef struct {
  Word16 gbuf[5];
  Word16 past_gain_code;
  Word16 prev_gc;
} ec_gain_codeState;
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/

/*
**************************************************************************
*
*  Function    : ec_gain_code_init
*  Purpose     : Allocates memory and initializes state variables
*
**************************************************************************
*/
int ec_gain_code_init (
    ec_gain_codeState **state
);
 
/*
**************************************************************************
*
*  Function    : ec_gain_code_reset
*  Purpose     : Resets state memory
*
**************************************************************************
*/
int ec_gain_code_reset (
    ec_gain_codeState *state
);
 
/*
**************************************************************************
*
*  Function    : ec_gain_code_exit
*  Purpose     : The memory used for state memory is freed
*
**************************************************************************
*/
void ec_gain_code_exit (
    ec_gain_codeState **state
);

/*
**************************************************************************
*
*  Function    : ec_gain_code
*  Purpose     : conceal the codebook gain
*                Call this function only in BFI (instead of normal gain
*                decoding function)
*
**************************************************************************
*/
void ec_gain_code (
    ec_gain_codeState *st,    /* i/o : State struct                     */
    gc_predState *pred_state, /* i/o : MA predictor state               */
    Word16 state,             /* i   : state of the state machine       */
    Word16 *gain_code         /* o   : decoded innovation gain          */
);

/*
**************************************************************************
*
*  Function    : ec_gain_code_update
*  Purpose     : update the codebook gain concealment state;
*                limit gain_code if the previous frame was bad
*                Call this function always after decoding (or concealing)
*                the gain
*
**************************************************************************
*/
void ec_gain_code_update (
    ec_gain_codeState *st,    /* i/o : State struct                     */
    Word16 bfi,               /* i   : flag: frame is bad               */
    Word16 prev_bf,           /* i   : flag: previous frame was bad     */
    Word16 *gain_code         /* i/o : decoded innovation gain          */
);


/*
**************************************************************************
*
*  Function    : ec_gain_pitch_init
*  Purpose     : Allocates memory and initializes state memory.
*
**************************************************************************
*/
int ec_gain_pitch_init (
    ec_gain_pitchState **state
);
 
/*
**************************************************************************
*
*  Function:   ec_gain_pitch_reset
*  Purpose:    Resets state memory
*
**************************************************************************
*/
int ec_gain_pitch_reset (
    ec_gain_pitchState *state
);
 
/*************************************************************************
*
*  Function    : ec_gain_pitch_exit
*  Purpose     : The memory used for state memory is freed
*
**************************************************************************
*/
void ec_gain_pitch_exit (
    ec_gain_pitchState **state
);

/*
**************************************************************************
*
*  Function    : ec_gain_pitch
*  Purpose     : conceal the pitch gain
*                Call this function only in BFI (instead of normal gain
*                decoding function)
*
**************************************************************************
*/
void ec_gain_pitch (
    ec_gain_pitchState *st, /* i/o : state variables                   */
    Word16 state,           /* i   : state of the state machine        */
    Word16 *gain_pitch      /* o   : pitch gain (Q14)                  */
);

/*
**************************************************************************
*
*  Function    : ec_gain_pitch_update
*  Purpose     : update the pitch gain concealment state;
*                limit gain_pitch if the previous frame was bad
*                Call this function always after decoding (or concealing)
*                the gain
*
**************************************************************************
*/
void ec_gain_pitch_update (
    ec_gain_pitchState *st, /* i/o : state variables                   */
    Word16 bfi,             /* i   : flag: frame is bad               */
    Word16 prev_bf,         /* i   : flag: previous frame was bad     */
    Word16 *gain_pitch      /* i/o : pitch gain                        */
);

 
#endif