#ifndef VAD_H#define VAD_H#include "typedef.h"#define VAD1                        /* VAD Algorithm Selection Compile Switch */#define FRAME_LEN 160        /* Length (samples) of the input frame          */#define COMPLEN 9               /* Number of sub-bands used by VAD              */#define INV_COMPLEN 3641  /* 1.0/COMPLEN*2^15                             */#define LOOKAHEAD 40         /* length of the lookahead used by speech coder */#define UNITY 512                /* Scaling used with SNR calculation            */#define UNIRSHFT 6              /* = log2(MAX_16/UNITY)                         */#define TONE_THR (Word16)(0.65*MAX_16) /* Threshold for tone detection   *//* Constants for background spectrum update */#define ALPHA_UP1   (Word16)((1.0 - 0.95)*MAX_16)         /* Normal update, upwards:   */#define ALPHA_DOWN1 (Word16)((1.0 - 0.936)*MAX_16)    /* Normal update, downwards  */#define ALPHA_UP2   (Word16)((1.0 - 0.985)*MAX_16)        /* Forced update, upwards    */#define ALPHA_DOWN2 (Word16)((1.0 - 0.943)*MAX_16)     /* Forced update, downwards  */#define ALPHA3      (Word16)((1.0 - 0.95)*MAX_16)             /* Update downwards          */#define ALPHA4      (Word16)((1.0 - 0.9)*MAX_16)               /* For stationary estimation */#define ALPHA5      (Word16)((1.0 - 0.5)*MAX_16)               /* For stationary estimation *//* Constants for VAD threshold */#define VAD_THR_HIGH 1260   /* Highest threshold                 */#define VAD_THR_LOW  720     /* Lowest threshold                  */#define VAD_P1 0                    /* Noise level for highest threshold */#define VAD_P2 6300               /* Noise level for lowest threshold  */#define VAD_SLOPE (Word16)(MAX_16*(float)(VAD_THR_LOW-VAD_THR_HIGH)/(float)(VAD_P2-VAD_P1))/* Parameters for background spectrum recovery function */#define STAT_COUNT 20                   /* threshold of stationary detection counter         */#define STAT_COUNT_BY_2 10         /* threshold of stationary detection counter         */#define CAD_MIN_STAT_COUNT 5    /* threshold of stationary detection counter         */#define STAT_THR_LEVEL 184    /* Threshold level for stationarity detection        */#define STAT_THR 1000              /* Threshold for stationarity detection              *//* Limits for background noise estimate */#define NOISE_MIN 40              /* minimum */#define NOISE_MAX 16000        /* maximum */#define NOISE_INIT 150            /* initial *//* Constants for VAD hangover addition */#define HANG_NOISE_THR 100#define BURST_LEN_HIGH_NOISE 4#define HANG_LEN_HIGH_NOISE 7#define BURST_LEN_LOW_NOISE 5#define HANG_LEN_LOW_NOISE 4/* Thresholds for signal power */#define VAD_POW_LOW (Word32)15000         /* If input power is lower,              .   VAD is set to 0                         */#define POW_PITCH_THR (Word32)343040     /* If input power is lower, pitch       .     detection is ignored                    */#define POW_COMPLEX_THR (Word32)15000  /* If input power is lower, complex      . flags  value for previous frame  is un-set  */ /* Constants for the filter bank */#define LEVEL_SHIFT 0       /* scaling                                  */#define COEFF3   13363       /* coefficient for the 3rd order filter     */#define COEFF5_1 21955     /* 1st coefficient the for 5th order filter */#define COEFF5_2 6390       /* 2nd coefficient the for 5th order filter *//* Constants for pitch detection */#define LTHRESH 4#define NTHRESH 4/* Constants for complex signal VAD  */#define CVAD_THRESH_ADAPT_HIGH  (Word16)(0.6 * MAX_16)  /* threshold for adapt stopping high    */#define CVAD_THRESH_ADAPT_LOW  (Word16)(0.5 * MAX_16)   /* threshold for adapt stopping low     */#define CVAD_THRESH_IN_NOISE  (Word16)(0.65 * MAX_16)     /* threshold going into speech on  a short term basis                   */#define CVAD_THRESH_HANG  (Word16)(0.70 * MAX_16)      /* threshold                            */#define CVAD_HANG_LIMIT  (Word16)(100)                          /* 2 second estimation time             */#define CVAD_HANG_LENGTH  (Word16)(250)                       /* 5 second hangover                    */#define CVAD_LOWPOW_RESET (Word16) (0.40 * MAX_16)     /* init in low power segment            */#define CVAD_MIN_CORR (Word16) (0.40 * MAX_16)               /* lowest adaptation value              */#define CVAD_BURST 20                                                                         /* speech burst length for speech reset */#define CVAD_ADAPT_SLOW (Word16)(( 1.0 - 0.98) * MAX_16)              /* threshold for slow adaption */#define CVAD_ADAPT_FAST (Word16)((1.0 - 0.92) * MAX_16)                /* threshold for fast adaption */#define CVAD_ADAPT_REALLY_FAST (Word16)((1.0 - 0.80) * MAX_16)  /* threshold for really fastadaption                    *//* state variable */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[3][2];             /* memory for the filter bank               */   Word16 a_data3[5];                 /* 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 three variables (vadreg, pitch and tone)      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;                        /* flags for pitch detection                */   Word16 tone;                         /* flags for tone detection                 */   Word16 complex_high;         /* flags for complex detection              */   Word16 complex_low;           /* flags for complex detection              */   Word16 oldlag_count, oldlag;     /* variables for pitch detection            */    Word16 complex_hang_count;   /* complex hangover counter, used by VAD    */   Word16 complex_hang_timer;   /* hangover initiator, used by CAD          */       Word16 best_corr_hp;                 /* FIP filtered value Q15                   */    Word16 speech_vad_decision;   /* final decision                           */   Word16 complex_warning;          /* complex background warning               */   Word16 sp_burst_count;             /* counts length of a speech burst incl  HO addition                              */   Word16 corr_hp_fast;                  /* filtered value                           */ } vadState1;/***** Defines ****/#define		YES		1#define		NO		0#define		ON		1#define		OFF		0#define		TRUE		1#define		FALSE		0#define         FRM_LEN                 80#define         DELAY                   24#define         FFT_LEN                 128#define         NUM_CHAN                16#define         LO_CHAN                 0#define         HI_CHAN                 15#define         UPDATE_THLD             35#define         HYSTER_CNT_THLD         6#define         UPDATE_CNT_THLD         50#define		SHIFT_STATE_0		0		       /* channel energy scaled as 22,9 */#define		SHIFT_STATE_1		1		       /* channel energy scaled as 27,4 */#define		NOISE_FLOOR_CHAN_0	512		/* 1.0    scaled as 22,9 */#define		MIN_CHAN_ENRG_0		32		/* 0.0625 scaled as 22,9 */#define		MIN_NOISE_ENRG_0	32		       /* 0.0625 scaled as 22,9 */#define		INE_NOISE_0		8192		/* 16.0   scaled as 22,9 */#define		FRACTIONAL_BITS_0	9		       /* used as input to fn10Log10() */#define		NOISE_FLOOR_CHAN_1	16		/* 1.0    scaled as 27,4 */#define		MIN_CHAN_ENRG_1		1		/* 0.0625 scaled as 27,4 */#define		MIN_NOISE_ENRG_1	1		       /* 0.0625 scaled as 27,4 */#define		INE_NOISE_1		256		       /* 16.0   scaled as 27,4 */#define		FRACTIONAL_BITS_1	4		       /* used as input to fn10Log10() */#define		STATE_1_TO_0_SHIFT_R	(FRACTIONAL_BITS_1-FRACTIONAL_BITS_0)	/* state correction factor */#define		STATE_0_TO_1_SHIFT_R	(FRACTIONAL_BITS_0-FRACTIONAL_BITS_1)	/* state correction factor */#define         HIGH_ALPHA              29491		/* 0.9 scaled as 0,15 */#define         LOW_ALPHA               22938		/* 0.7 scaled as 0,15 */#define         ALPHA_RANGE             (HIGH_ALPHA - LOW_ALPHA)#define         DEV_THLD                7168		       /* 28.0 scaled as 7,8 */#define         PRE_EMP_FAC             (-26214)	       /* -0.8 scaled as 0,15 */#define         CEE_SM_FAC              18022		/* 0.55 scaled as 0,15 */#define         ONE_MINUS_CEE_SM_FAC    14746  /* 0.45 scaled as 0,15 */#define         CNE_SM_FAC              3277		       /* 0.1 scaled as 0,15 */#define         ONE_MINUS_CNE_SM_FAC    29491  /* 0.9 scaled as 0,15 */#define         FFT_HEADROOM            2typedef struct{	Word16 pre_emp_mem;	Word16 update_cnt;	Word16 hyster_cnt;	Word16 last_update_cnt;	Word16 ch_enrg_long_db[NUM_CHAN];	/* scaled as 7,8  */	Word32 Lframe_cnt;	Word32 Lch_enrg[NUM_CHAN];	/* scaled as 22,9 or 27,4 */	Word32 Lch_noise[NUM_CHAN];	/* scaled as 22,9 */	Word16 last_normb_shift;	      /* last block norm shift count */	Word16 tsnr;			             /* total signal-to-noise ratio in dB (scaled as 7,8) */	Word16 hangover;	Word16 burstcount;	Word16 fupdate_flag;		/* forced update flag from previous frame */	Word16 negSNRvar;		/* Negative SNR variance (scaled as 7,8) */	Word16 negSNRbias;		/* sensitivity bias from negative SNR variance (scaled as 15,0) */	Word16 shift_state;		/* use 22,9 or 27,4 scaling for ch_enrg[] */	Word32 L_R0;	Word32 L_Rmax;	Flag   LTP_flag;		      /* Use to indicate the the LTP gain is > LTP_THRESH */} vadState2;/**********************************************************************************                         DECLARATION OF PROTOTYPES*********************************************************************************/int vad1_init (vadState1 **st); int vad1_reset (vadState1 *st);void vad1_exit (vadState1 **st);Word16 vad1 (vadState1 *st,   Word16 in_buf[]  );Word16	vad2 (Word16 *farray_ptr, vadState2 *st);int	vad2_init (vadState2 **st);void	vad2_exit (vadState2 **state);void	r_fft (Word16 *farray_ptr);#ifndef	VAD2#define vadState vadState1#else #define vadState vadState2#endif#endif