ref: 81cae8475c46dd7e376efb542f97b52dc53c89fd
dir: /amr-wb/wb_vad.h/
/*-------------------------------------------------------------------*
* WB_VAD.H *
*-------------------------------------------------------------------*
* Functions and static memory for Voice Activity Detection. *
*-------------------------------------------------------------------*/
#ifndef wb_vad_h
#define wb_vad_h
/******************************************************************************
* INCLUDE FILES
******************************************************************************/
#include "typedef.h"
#include "wb_vad_c.h"
/******************************************************************************
* DEFINITION OF DATA TYPES
******************************************************************************/
typedef struct
{
Word16 bckr_est[COMPLEN]; /* background noise estimate */
Word16 ave_level[COMPLEN]; /* averaged input components for stationary */
/* estimation */
Word16 old_level[COMPLEN]; /* input levels of the previous frame */
Word16 sub_level[COMPLEN]; /* input levels calculated at the end of a frame (lookahead) */
Word16 a_data5[F_5TH_CNT][2]; /* memory for the filter bank */
Word16 a_data3[F_3TH_CNT]; /* memory for the filter bank */
Word16 burst_count; /* counts length of a speech burst */
Word16 hang_count; /* hangover counter */
Word16 stat_count; /* stationary counter */
/* Note that each of the following two variables holds 15 flags. Each flag reserves 1 bit of the
* variable. The newest flag is in the bit 15 (assuming that LSB is bit 1 and MSB is bit 16). */
Word16 vadreg; /* flags for intermediate VAD decisions */
Word16 tone_flag; /* tone detection flags */
Word16 sp_est_cnt; /* counter for speech level estimation */
Word16 sp_max; /* maximum level */
Word16 sp_max_cnt; /* counts frames that contains speech */
Word16 speech_level; /* estimated speech level */
Word32 prev_pow_sum; /* power of previous frame */
} VadVars;
/********************************************************************************
*
* DECLARATION OF PROTOTYPES
********************************************************************************/
Word16 wb_vad_init(VadVars ** st);
Word16 wb_vad_reset(VadVars * st);
void wb_vad_exit(VadVars ** st);
void wb_vad_tone_detection(VadVars * st, Word16 p_gain);
Word16 wb_vad(VadVars * st, Word16 in_buf[]);
#endif