Leaked source code of windows server 2003
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/**********************************************************************//**********************************************************************//********* Global constants used by silence detector *******//**********************************************************************//**********************************************************************/
//BUFERSIZE is the size, in samples, of the speech encoder input buffer.
//This should be set to the same value as MYCODEC_BUFFER_SAMPS in mycodec.h
#define BUFFERSIZE 240
//HIST_TIME is the time period, in seconds, represented by the number of past values of SD
// parameters kept in memory. HIST_SIZE is the size of the history arrys and is set so
// that the size of the history arrays correspond to HIST_TIME seconds of stored SD parameters.
#define HIST_TIME 1.0
#define HIST_SIZE (int)(HIST_TIME*8000/BUFFERSIZE)
//ENERGY_TAU_HIST_TIME is the time period, in seconds, represented by the number of past
// values of energy tau kept in memory. Energy tau is used only by the SD initializer.
#define ENERGY_TAU_HIST_TIME 1.5
#define ENERGY_TAU_HIST_SIZE (int)(ENERGY_TAU_HIST_TIME*8000/BUFFERSIZE)
#define OFFSET 10
#define MAX_SAMPLE 32768.0
#define MASK_SILENCE_MARKED 0x01
#define MASK_EARLY_EXIT 0x02
#define MASK_SILENCE_CODED 0x04
#define MASK_SQUELCH 0xF00
//The following times (in seconds) are used by initializeSD to
// decide when to stop initializing.
//Initialization is not allowed to complete before the end of
// MIN_STARTUP_TIME, in seconds.
//If initialization fails before the end of MAX_STARTUP_TIME,
// silence detection is disabled
#define MIN_STARTUP_TIME 2
#define MAX_STARTUP_TIME 20
#define STOPPING_STDEV 3.0
#define INITL_STOPPING_STDEV 10.0
#define INITL_MIN_TAU 20.0
#define INITL_STDEV 2.0
//MAX_SPEECH_TIME time is the amount of time in seconds that the silence "off"
// mode (no silent frames detected) is allowed to continue before
// reinitialization is automatically invoked.
#define MAX_SPEECH_TIME 4.0
//SD_MIN_BUFFERSIZE is the smallest possible input buffersize
// in bytes for silence detection (20 samples)
#define SD_MIN_BUFFERSIZE 40
//Initial threshold settings
#define SLIDER_MAX 100.0f
#define SLIDER_MIN 0.0f
#define INITL_HANGTIME 0
#define MIN_SPEECH_INTERVAL 6
#define HANG_SLOPE 6.0f/14.0f
#define INITL_ENERGY_ON 3.8f
#define INITL_ENERGY_TX INITL_ENERGY_ON
#define INITL_ZC_ON 2.0f
#define INITL_ZC_TX INITL_ZC_ON
#define ZC_SLOPE 0.045f
#define INITL_ALPHA_ON 2.0f
#define INITL_ENERGY_OFF 2.8f
#define INITL_ZC_OFF INITL_ZC_ON
#define INITL_ALPHA_OFF INITL_ALPHA_ON
#define FALSE 0
#define TRUE 1
#define SPEECH 0
#define SILENCE 1
#define NONADAPT 3
/**********************************************************************//**********************************************************************//********* Data structure for silence detector and prefilters *******//**********************************************************************//**********************************************************************/
typedef struct {
float Mean; float Stdev; float History[HIST_SIZE];
} STATS;
typedef struct {
STATS Energy; STATS Alpha1; STATS ZC; int FrameCount; } MODE0;
typedef struct {
STATS Energy; int FrameCount; } MODE1;
typedef struct {
float TauMean; float TauStdev; float TauHistory[ENERGY_TAU_HIST_SIZE];
} TAU_STATS;
typedef struct {
TAU_STATS TauEnergy; TAU_STATS TauAlpha1; TAU_STATS TauZC; } TAU_MODE;
typedef struct {
/*The following parameters are used to set thresholds for
* changing from silence to speechmode designation in Silence_Detect. * These are factors which are used to multiply the standard deviation of * the energy, alpha1, & zero crossing, respectively. */ float Energy_on; float ZC_on; float Alpha1_on;
float Energy_tx; float ZC_tx;
/*The following parameters are used to set thresholds for
* changing from speech to silent mode designation in Silence_Detect. *These are factors which are used to multiply the standard deviation of * the energy & zero crossing, respectively. */ float Energy_off; float ZC_off; float Alpha1_off;
/* Tau is the distance between the Mode0 (silence) and the Mode1 (speech) energy means.
If the distance between mode 0 and mode 1 energy means is less than MIN_TAU, silence detection is impossible. */ float Energy_MinTau;
/* Energy squelch level */ float Squelch_set;
int BufferSize; int HistSize; int TauHistSize;
int MinStartupCount; int MaxStartupCount;
int MaxSpeechFrameCount;
} SETTINGS;
typedef struct {
float nBuffer[4]; float dBuffer[3]; float denom[6]; float num[6]; float sbuff[BUFFERSIZE]; float storebuff[BUFFERSIZE];
} FILTERS;
typedef struct {
MODE0 Mode0; MODE1 Mode1;
MODE0 *Mode0Ptr; MODE1 *Mode1Ptr;
TAU_MODE TauMode; int initFrameCount; int Class; int SD_enable;
float FrameEnergy; float FrameLinPred; float FrameZCs;
SETTINGS SDsettings;
FILTERS Filt;
int HangCntr;
} SD_STATE_VALS;
typedef struct { long SDFlags;
//COMFORT_PARMS ComfortParms;
SD_STATE_VALS SDstate;
} INSTNCE, *SD_INST;
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