--- a/libtwamr/Makefile	Tue May 07 01:14:14 2024 +0000
+++ b/libtwamr/Makefile	Tue May 07 01:18:25 2024 +0000
@@ -9,13 +9,14 @@
 	dtx_enc.o e_homing.o ec_gains.o enc_lag3.o enc_lag6.o ex_ctrl.o \
 	g_adapt.o g_code.o g_pitch.o gain_q.o gains_tab.o gc_pred.o gmed_n.o \
 	graytab.o hp_max.o int_lpc.o int_lsf.o inter_36.o inv_sqrt.o lag_wind.o\
-	levinson.o log2.o lpc.o lsfwt.o lsp.o lsp_avg.o lsp_az.o lsp_lsf.o \
-	lsp_tab.o mac_32.o oper_32b.o ph_disp.o pitch_fr.o post_pro.o pow2.o \
-	pre_big.o pre_proc.o pred_lt.o preemph.o prm2bits.o prmno.o pstfilt.o \
-	q_gain_c.o q_gain_p.o q_plsf.o q_plsf3_tab.o q_plsf5_tab.o q_plsf_3.o \
-	q_plsf_5.o qgain475.o qgain795.o qua_gain.o qua_gain_tab.o reorder.o \
-	residu.o s10_8pf.o set_sign.o sid_sync.o spreproc.o spstproc.o sqrt_l.o\
-	syn_filt.o tls_flags.o ton_stab.o vad1.o vad2.o weight_a.o window.o
+	levinson.o lflg_upd.o log2.o lpc.o lsfwt.o lsp.o lsp_avg.o lsp_az.o \
+	lsp_lsf.o lsp_tab.o mac_32.o oper_32b.o ph_disp.o pitch_fr.o post_pro.o\
+	pow2.o pre_big.o pre_proc.o pred_lt.o preemph.o prm2bits.o prmno.o \
+	pstfilt.o q_gain_c.o q_gain_p.o q_plsf.o q_plsf3_tab.o q_plsf5_tab.o \
+	q_plsf_3.o q_plsf_5.o qgain475.o qgain795.o qua_gain.o qua_gain_tab.o \
+	reorder.o residu.o s10_8pf.o set_sign.o sid_sync.o spreproc.o \
+	spstproc.o sqrt_l.o syn_filt.o tls_flags.o ton_stab.o vad1.o vad2.o \
+	weight_a.o window.o
 HDRS=	namespace.h
 LIB=	libtwamr.a
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/lflg_upd.c	Tue May 07 01:18:25 2024 +0000
@@ -0,0 +1,85 @@
+/*
+*****************************************************************************
+*
+*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
+*                                R99   Version 3.3.0                
+*                                REL-4 Version 4.1.0                
+*
+*****************************************************************************
+*
+*      File             : lflg_upd.c
+*      Purpose          : LTP_flag update for AMR VAD option 2
+*
+*****************************************************************************
+*/
+
+#include "tw_amr.h"
+#include "namespace.h"
+#include "typedef.h"
+#include "cnst.h"
+#include "basic_op.h"
+#include "oper_32b.h"
+#include "no_count.h"
+#include "vad2.h"
+
+/***************************************************************************
+ *
+ *   FUNCTION NAME: LTP_flag_update
+ *
+ *   PURPOSE:
+ *     Set LTP_flag if the LTP gain > LTP_THRESHOLD, where the value of
+ *     LTP_THRESHOLD depends on the LTP analysis window length.
+ *
+ *   INPUTS:
+ *
+ *     mode
+ *                     AMR mode
+ *     vadState->L_R0
+ *                     LTP energy
+ *     vadState->L_Rmax
+ *                     LTP maximum autocorrelation
+ *   OUTPUTS:
+ *
+ *     vadState->LTP_flag
+ *                     Set if LTP gain > LTP_THRESHOLD
+ *
+ *   RETURN VALUE:
+ *
+ *     none
+ *
+ *************************************************************************/
+
+void LTP_flag_update (vadState2 * st, Word16 mode)
+{
+	Word16 thresh;
+	Word16 hi1;
+	Word16 lo1;
+	Word32 Ltmp;
+
+									test(); test();
+	if ((sub(mode, MR475) == 0) || (sub(mode, MR515) == 0))
+	{
+		thresh = (Word16)(32768.0*0.55);			move16();
+	}
+	else if (sub(mode, MR102) == 0)
+	{
+		thresh = (Word16)(32768.0*0.60);			move16();
+	}
+	else
+	{
+		thresh = (Word16)(32768.0*0.65);			move16();
+	}
+
+	L_Extract (st->L_R0, &hi1, &lo1);
+	Ltmp = Mpy_32_16(hi1, lo1, thresh);				test();
+	if (L_sub(st->L_Rmax, Ltmp) > 0)
+	{
+		st->LTP_flag = TRUE;					move16();
+	}
+	else
+	{
+		st->LTP_flag = FALSE;					move16();
+	}
+
+	return;
+}