wb_vad.h

关于AMR-WB+语音压缩编码的实现代码

#ifndef wb_vad_h
#define wb_vad_h

/******************************************************************************
*                         INCLUDE FILES
******************************************************************************/
#include "../lib_amr/typedef.h"
#include "wb_vad_c.h"

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

typedef struct
{
    float bckr_est[COMPLEN];    /* background noise estimate */
    float ave_level[COMPLEN];   /* averaged input components for stationary */
    /* estimation */
    float old_level[COMPLEN];   /* input levels of the previous frame */
    float sub_level[COMPLEN];   /* input levels calculated at the end of a frame (lookahead) */
    float a_data5[F_5TH_CNT][2];        /* memory for the filter bank */
    float 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 pitch_tone;          /* flags for pitch and tone detection */

    Word16 sp_est_cnt;          /* counter for speech level estimation */
    float sp_max;               /* maximum level */
    Word16 sp_max_cnt;          /* counts frames that contains speech */
    float speech_level;         /* estimated speech level */
    double prev_pow_sum;        /* power of previous frame */

    float level[COMPLEN];
    float prevLevel[COMPLEN];
} VadVars;

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
int wb_vad_init(VadVars ** st);
int wb_vad_reset(VadVars * st);
void wb_vad_exit(VadVars ** st);
void wb_vad_pitch_tone_detection(VadVars * st, float p_gain);
Word16 wb_vad(VadVars * st, float in_buf[]);

#endif