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|
/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:
3GPP TS 26.073
ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
Available from http://www.3gpp.org
(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------
Pathname: ./audio/gsm-amr/c/src/p_ol_wgh.c
Funtions: p_ol_wgh_init
p_ol_wgh_reset
p_ol_wgh_exit
Lag_max
Pitch_ol_wgh
Date: 02/05/2002
------------------------------------------------------------------------------
REVISION HISTORY
Description: t0 was not being declared as Word32.
Description: Replaced OSCL mem type functions and eliminated include
files that now are chosen by OSCL definitions
Description: Replaced "int" and/or "char" with OSCL defined types.
Description: Changed round function name to pv_round to avoid conflict with
round function in C standard library.
Description:
------------------------------------------------------------------------------
MODULE DESCRIPTION
The modules in this file compute the open loop pitch lag with weighting.
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include <stdlib.h>
#include "p_ol_wgh.h"
#include "typedef.h"
#include "cnst.h"
#include "basic_op.h"
#include "gmed_n.h"
#include "inv_sqrt.h"
#include "vad1.h"
#include "calc_cor.h"
#include "hp_max.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: p_ol_wgh_init
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs
state = pointer to a pointer of structure type pitchOLWghtState
Outputs:
None
Returns:
0 if the memory allocation is a success
-1 if the memory allocation fails
Global Variables Used:
None.
Local Variables Needed:
None.
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function allocates state memory and initializes state memory
------------------------------------------------------------------------------
REQUIREMENTS
None.
------------------------------------------------------------------------------
REFERENCES
p_ol_wgh.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
int p_ol_wgh_init (pitchOLWghtState **state)
{
pitchOLWghtState* s;
if (state == (pitchOLWghtState **) NULL){
// fprintf(stderr, "p_ol_wgh_init: invalid parameter\n");
return -1;
}
*state = NULL;
// allocate memory
if ((s= (pitchOLWghtState *) malloc(sizeof(pitchOLWghtState))) == NULL){
// fprintf(stderr, "p_ol_wgh_init: can not malloc state structure\n");
return -1;
}
p_ol_wgh_reset(s);
*state = s;
return 0;
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 p_ol_wgh_init(pitchOLWghtState **state)
{
pitchOLWghtState* s;
if (state == (pitchOLWghtState **) NULL)
{
/* fprintf(stderr, "p_ol_wgh_init: invalid parameter\n"); */
return -1;
}
*state = NULL;
/* allocate memory */
if ((s = (pitchOLWghtState *) malloc(sizeof(pitchOLWghtState))) == NULL)
{
/* fprintf(stderr, "p_ol_wgh_init: can not malloc state structure\n"); */
return -1;
}
p_ol_wgh_reset(s);
*state = s;
return 0;
}
/*----------------------------------------------------------------------------
; End Function: p_ol_wgh_init
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: p_ol_wgh_reset
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs
st = pointer to structure type pitchOLWghtState
Outputs:
None
Returns:
0 if the memory initialization is a success
-1 if the memory initialization fails
Global Variables Used:
None.
Local Variables Needed:
None.
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function initializes state memory to zero
------------------------------------------------------------------------------
REQUIREMENTS
None.
------------------------------------------------------------------------------
REFERENCES
p_ol_wgh.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
int p_ol_wgh_reset (pitchOLWghtState *st)
{
if (st == (pitchOLWghtState *) NULL){
// fprintf(stderr, "p_ol_wgh_reset: invalid parameter\n");
return -1;
}
// Reset pitch search states
st->old_T0_med = 40;
st->ada_w = 0;
st->wght_flg = 0;
return 0;
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 p_ol_wgh_reset(pitchOLWghtState *st)
{
if (st == (pitchOLWghtState *) NULL)
{
/* fprintf(stderr, "p_ol_wgh_reset: invalid parameter\n"); */
return -1;
}
/* Reset pitch search states */
st->old_T0_med = 40;
st->ada_w = 0;
st->wght_flg = 0;
return 0;
}
/*----------------------------------------------------------------------------
; End Function: p_ol_wgh_reset
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: p_ol_wgh_exit
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs
st = pointer to a pointer of structure type pitchOLWghtState
Outputs:
None
Returns:
0 if the memory initialization is a success
-1 if the memory initialization fails
Global Variables Used:
None.
Local Variables Needed:
None.
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function frees the memory used for state memory
------------------------------------------------------------------------------
REQUIREMENTS
None.
------------------------------------------------------------------------------
REFERENCES
p_ol_wgh.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
void p_ol_wgh_exit (pitchOLWghtState **state)
{
if (state == NULL || *state == NULL)
return;
// deallocate memory
free(*state);
*state = NULL;
return;
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
void p_ol_wgh_exit(pitchOLWghtState **state)
{
if (state == NULL || *state == NULL)
return;
/* deallocate memory */
free(*state);
*state = NULL;
return;
}
/*----------------------------------------------------------------------------
; End Function: p_ol_wgh_exit
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Lag_max
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
corr = pointer to buffer of correlation values (Word32)
scal_sig = pointer to buffer of scaled signal values (Word16)
scal_fac = scaled signal factor (Word16)
scal_flag = EFR compatible scaling flag (Word16)
L_frame = length of frame to compute pitch (Word16)
lag_max = maximum lag (Word16)
lag_min = minimum lag (Word16)
cor_max = pointer to the normalized correlation of selected lag (Word16)
rmax = pointer to max(<s[i]*s[j]>), (Word32)
r0 = pointer to the residual energy (Word32)
dtx = dtx flag; equal to 1, if dtx is enabled, 0, otherwise (Flag)
pOverflow = Pointer to overflow (Flag)
Outputs:
cor_max contains the newly calculated normalized correlation of the
selected lag
rmax contains the newly calculated max(<s[i]*s[j]>)
r0 contains the newly calculated residual energy
pOverflow -> 1 if the math functions called by this routine saturate.
Returns:
p_max = lag of the max correlation found (Word16)
Global Variables Used:
None.
Local Variables Needed:
None.
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function finds the lag that has maximum correlation of scal_sig[] in a
given delay range.
The correlation is given by
cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max
The functions outputs the maximum correlation after normalization and the
corresponding lag.
------------------------------------------------------------------------------
REQUIREMENTS
None.
------------------------------------------------------------------------------
REFERENCES
p_ol_wgh.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
static Word16 Lag_max ( // o : lag found
vadState *vadSt, // i/o : VAD state struct
Word32 corr[], // i : correlation vector.
Word16 scal_sig[], // i : scaled signal.
Word16 L_frame, // i : length of frame to compute pitch
Word16 lag_max, // i : maximum lag
Word16 lag_min, // i : minimum lag
Word16 old_lag, // i : old open-loop lag
Word16 *cor_max, // o : normalized correlation of selected lag
Word16 wght_flg, // i : is weighting function used
Word16 *gain_flg, // o : open-loop flag
Flag dtx // i : dtx flag; use dtx=1, do not use dtx=0
)
{
Word16 i, j;
Word16 *p, *p1;
Word32 max, t0;
Word16 t0_h, t0_l;
Word16 p_max;
const Word16 *ww, *we;
Word32 t1;
ww = &corrweight[250];
we = &corrweight[123 + lag_max - old_lag];
max = MIN_32;
p_max = lag_max;
for (i = lag_max; i >= lag_min; i--)
{
t0 = corr[-i];
// Weighting of the correlation function.
L_Extract (corr[-i], &t0_h, &t0_l);
t0 = Mpy_32_16 (t0_h, t0_l, *ww);
ww--;
if (wght_flg > 0) {
// Weight the neighbourhood of the old lag
L_Extract (t0, &t0_h, &t0_l);
t0 = Mpy_32_16 (t0_h, t0_l, *we);
we--;
}
if (L_sub (t0, max) >= 0)
{
max = t0;
p_max = i;
}
}
p = &scal_sig[0];
p1 = &scal_sig[-p_max];
t0 = 0;
t1 = 0;
for (j = 0; j < L_frame; j++, p++, p1++)
{
t0 = L_mac (t0, *p, *p1);
t1 = L_mac (t1, *p1, *p1);
}
if (dtx)
{ // no test() call since this if is only in simulation env
#ifdef VAD2
vadSt->L_Rmax = L_add(vadSt->L_Rmax, t0); // Save max correlation
vadSt->L_R0 = L_add(vadSt->L_R0, t1); // Save max energy
#else
// update and detect tone
vad_tone_detection_update (vadSt, 0);
vad_tone_detection (vadSt, t0, t1);
#endif
}
// gain flag is set according to the open_loop gain
// is t2/t1 > 0.4 ?
*gain_flg = pv_round(L_msu(t0, pv_round(t1), 13107));
*cor_max = 0;
return (p_max);
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
static Word16 Lag_max( /* o : lag found */
vadState *vadSt, /* i/o : VAD state struct */
Word32 corr[], /* i : correlation vector. */
Word16 scal_sig[], /* i : scaled signal. */
Word16 L_frame, /* i : length of frame to compute pitch */
Word16 lag_max, /* i : maximum lag */
Word16 lag_min, /* i : minimum lag */
Word16 old_lag, /* i : old open-loop lag */
Word16 *cor_max, /* o : normalized correlation of selected lag */
Word16 wght_flg, /* i : is weighting function used */
Word16 *gain_flg, /* o : open-loop flag */
Flag dtx, /* i : dtx flag; use dtx=1, do not use dtx=0 */
Flag *pOverflow /* o : overflow flag */
)
{
Word16 i;
Word16 j;
Word16 *p;
Word16 *p1;
Word32 max;
Word32 t0;
Word16 t0_h;
Word16 t0_l;
Word16 p_max;
const Word16 *ww;
const Word16 *we;
Word32 t1;
Word16 temp;
ww = &corrweight[250];
we = &corrweight[123 + lag_max - old_lag];
max = MIN_32;
p_max = lag_max;
for (i = lag_max; i >= lag_min; i--)
{
t0 = corr[-i];
/* Weighting of the correlation function. */
L_Extract(corr[-i], &t0_h, &t0_l, pOverflow);
t0 = Mpy_32_16(t0_h, t0_l, *ww, pOverflow);
ww--;
if (wght_flg > 0)
{
/* Weight the neighbourhood of the old lag. */
L_Extract(t0, &t0_h, &t0_l, pOverflow);
t0 = Mpy_32_16(t0_h, t0_l, *we, pOverflow);
we--;
}
/* if (L_sub (t0, max) >= 0) */
if (t0 >= max)
{
max = t0;
p_max = i;
}
}
p = &scal_sig[0];
p1 = &scal_sig[-p_max];
t0 = 0;
t1 = 0;
for (j = 0; j < L_frame; j++, p++, p1++)
{
t0 = L_mac(t0, *p, *p1, pOverflow);
t1 = L_mac(t1, *p1, *p1, pOverflow);
}
if (dtx)
{ /* no test() call since this if is only in simulation env */
#ifdef VAD2
/* Save max correlation */
vadSt->L_Rmax = L_add(vadSt->L_Rmax, t0, pOverflow);
/* Save max energy */
vadSt->L_R0 = L_add(vadSt->L_R0, t1, pOverflow);
#else
/* update and detect tone */
vad_tone_detection_update(vadSt, 0, pOverflow);
vad_tone_detection(vadSt, t0, t1, pOverflow);
#endif
}
/* gain flag is set according to the open_loop gain */
/* is t2/t1 > 0.4 ? */
temp = pv_round(t1, pOverflow);
t1 = L_msu(t0, temp, 13107, pOverflow);
*gain_flg = pv_round(t1, pOverflow);
*cor_max = 0;
return (p_max);
}
/*----------------------------------------------------------------------------
; End Function: Lag_max
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Pitch_ol_wgh
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
st = pointer to pitchOLWghtState structure
vadSt = pointer to a vadState structure
signal = pointer to buffer of signal used to compute the open loop
pitch where signal[-pit_max] to signal[-1] should be known
pit_min = 16 bit value specifies the minimum pitch lag
pit_max = 16 bit value specifies the maximum pitch lag
L_frame = 16 bit value specifies the length of frame to compute pitch
old_lags = pointer to history with old stored Cl lags (Word16)
ol_gain_flg = pointer to OL gain flag (Word16)
idx = 16 bit value specifies the frame index
dtx = Data of type 'Flag' used for dtx. Use dtx=1, do not use dtx=0
pOverflow = pointer to Overflow indicator (Flag)
Outputs
st = The pitchOLWghtState may be modified
vadSt = The vadSt state structure may be modified.
pOverflow -> 1 if the math functions invoked by this routine saturate.
Returns:
p_max1 = 16 bit value representing the open loop pitch lag.
Global Variables Used:
None.
Local Variables Needed:
None.
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function performs an open-loop pitch search with weighting
------------------------------------------------------------------------------
REQUIREMENTS
None.
------------------------------------------------------------------------------
REFERENCES
pitch_ol.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
Word16 Pitch_ol_wgh ( // o : open loop pitch lag
pitchOLWghtState *st, // i/o : State struct
vadState *vadSt, // i/o : VAD state struct/
Word16 signal[], // i : signal used to compute the open loop pitch
// signal[-pit_max] to signal[-1] should be known
Word16 pit_min, // i : minimum pitch lag
Word16 pit_max, // i : maximum pitch lag
Word16 L_frame, // i : length of frame to compute pitch
Word16 old_lags[], // i : history with old stored Cl lags
Word16 ol_gain_flg[], // i : OL gain flag
Word16 idx, // i : index
Flag dtx // i : dtx flag; use dtx=1, do not use dtx=0
)
{
Word16 i;
Word16 max1;
Word16 p_max1;
Word32 t0;
#ifndef VAD2
Word16 corr_hp_max;
#endif
Word32 corr[PIT_MAX+1], *corr_ptr;
// Scaled signal
Word16 scaled_signal[PIT_MAX + L_FRAME];
Word16 *scal_sig;
scal_sig = &scaled_signal[pit_max];
t0 = 0L;
for (i = -pit_max; i < L_frame; i++)
{
t0 = L_mac (t0, signal[i], signal[i]);
}
//
// Scaling of input signal
//
// if Overflow -> scal_sig[i] = signal[i]>>2
// else if t0 < 1^22 -> scal_sig[i] = signal[i]<<2
// else -> scal_sig[i] = signal[i]
//
// Verification for risk of overflow.
//
// Test for overflow
if (L_sub (t0, MAX_32) == 0L)
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = shr (signal[i], 3);
}
}
else if (L_sub (t0, (Word32) 1048576L) < (Word32) 0)
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = shl (signal[i], 3);
}
}
else
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = signal[i];
}
}
// calculate all coreelations of scal_sig, from pit_min to pit_max
corr_ptr = &corr[pit_max];
comp_corr (scal_sig, L_frame, pit_max, pit_min, corr_ptr);
p_max1 = Lag_max (vadSt, corr_ptr, scal_sig, L_frame, pit_max, pit_min,
st->old_T0_med, &max1, st->wght_flg, &ol_gain_flg[idx],
dtx);
if (ol_gain_flg[idx] > 0)
{
// Calculate 5-point median of previous lag
for (i = 4; i > 0; i--) // Shift buffer
{
old_lags[i] = old_lags[i-1];
}
old_lags[0] = p_max1;
st->old_T0_med = gmed_n (old_lags, 5);
st->ada_w = 32767; // Q15 = 1.0
}
else
{
st->old_T0_med = p_max1;
st->ada_w = mult(st->ada_w, 29491); // = ada_w = ada_w * 0.9
}
if (sub(st->ada_w, 9830) < 0) // ada_w - 0.3
{
st->wght_flg = 0;
}
else
{
st->wght_flg = 1;
}
#ifndef VAD2
if (dtx)
{ // no test() call since this if is only in simulation env
if (sub(idx, 1) == 0)
{
// calculate max high-passed filtered correlation of all lags
hp_max (corr_ptr, scal_sig, L_frame, pit_max, pit_min, &corr_hp_max);
// update complex background detector
vad_complex_detection_update(vadSt, corr_hp_max);
}
}
#endif
return (p_max1);
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 Pitch_ol_wgh( /* o : open loop pitch lag */
pitchOLWghtState *st, /* i/o : State struct */
vadState *vadSt, /* i/o : VAD state struct */
Word16 signal[], /* i : signal used to compute the open loop pitch */
/* signal[-pit_max] to signal[-1] should be known */
Word16 pit_min, /* i : minimum pitch lag */
Word16 pit_max, /* i : maximum pitch lag */
Word16 L_frame, /* i : length of frame to compute pitch */
Word16 old_lags[], /* i : history with old stored Cl lags */
Word16 ol_gain_flg[], /* i : OL gain flag */
Word16 idx, /* i : index */
Flag dtx, /* i : dtx flag; use dtx=1, do not use dtx=0 */
Flag *pOverflow /* o : overflow flag */
)
{
Word16 i;
Word16 max1;
Word16 p_max1;
Word32 t0;
#ifndef VAD2
Word16 corr_hp_max;
#endif
Word32 corr[PIT_MAX+1], *corr_ptr;
/* Scaled signal */
Word16 scaled_signal[PIT_MAX + L_FRAME];
Word16 *scal_sig;
scal_sig = &scaled_signal[pit_max];
t0 = 0L;
for (i = -pit_max; i < L_frame; i++)
{
t0 = L_mac(t0, signal[i], signal[i], pOverflow);
}
/*--------------------------------------------------------*
* Scaling of input signal. *
* *
* if Overflow -> scal_sig[i] = signal[i]>>2 *
* else if t0 < 1^22 -> scal_sig[i] = signal[i]<<2 *
* else -> scal_sig[i] = signal[i] *
*--------------------------------------------------------*/
/*--------------------------------------------------------*
* Verification for risk of overflow. *
*--------------------------------------------------------*/
/* Test for overflow */
if (L_sub(t0, MAX_32, pOverflow) == 0L)
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = shr(signal[i], 3, pOverflow);
}
}
else if (L_sub(t0, (Word32) 1048576L, pOverflow) < (Word32) 0)
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = shl(signal[i], 3, pOverflow);
}
}
else
{
for (i = -pit_max; i < L_frame; i++)
{
scal_sig[i] = signal[i];
}
}
/* calculate all coreelations of scal_sig, from pit_min to pit_max */
corr_ptr = &corr[pit_max];
comp_corr(scal_sig, L_frame, pit_max, pit_min, corr_ptr);
p_max1 = Lag_max(vadSt, corr_ptr, scal_sig, L_frame, pit_max, pit_min,
st->old_T0_med, &max1, st->wght_flg, &ol_gain_flg[idx],
dtx, pOverflow);
if (ol_gain_flg[idx] > 0)
{
/* Calculate 5-point median of previous lags */
for (i = 4; i > 0; i--) /* Shift buffer */
{
old_lags[i] = old_lags[i-1];
}
old_lags[0] = p_max1;
st->old_T0_med = gmed_n(old_lags, 5);
st->ada_w = 32767; /* Q15 = 1.0 */
}
else
{
st->old_T0_med = p_max1;
/* = ada_w = ada_w * 0.9 */
st->ada_w = mult(st->ada_w, 29491, pOverflow);
}
if (sub(st->ada_w, 9830, pOverflow) < 0) /* ada_w - 0.3 */
{
st->wght_flg = 0;
}
else
{
st->wght_flg = 1;
}
#ifndef VAD2
if (dtx)
{ /* no test() call since this if is only in simulation env */
if (sub(idx, 1, pOverflow) == 0)
{
/* calculate max high-passed filtered correlation of all lags */
hp_max(corr_ptr, scal_sig, L_frame, pit_max, pit_min, &corr_hp_max, pOverflow);
/* update complex background detector */
vad_complex_detection_update(vadSt, corr_hp_max);
}
}
#endif
return (p_max1);
}
/*----------------------------------------------------------------------------
; End Function: Pitch_ol_wgh
----------------------------------------------------------------------------*/
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