--- a/libtwamr/Makefile	Tue May 07 03:50:25 2024 +0000
+++ b/libtwamr/Makefile	Tue May 07 04:51:04 2024 +0000
@@ -6,17 +6,18 @@
 	convolve.o cor_h.o d1035pf.o d2_11pf.o d2_9pf.o d3_14pf.o d4_17pf.o \
 	d8_31pf.o d_gain_c.o d_gain_p.o d_plsf.o d_plsf_3.o d_plsf_5.o \
 	dec_gain.o dec_lag3.o dec_lag6.o dhf_check.o dhf_tables.o dtx_dec.o \
-	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 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 ol_ltp.o oper_32b.o p_ol_wgh.o ph_disp.o \
-	pitch_fr.o pitch_ol.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 r_fft.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 vad_reset.o weight_a.o window.o
+	dtx_enc.o e_homing.o ec_gains.o enc_lag3.o enc_lag6.o enc_main.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 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 ol_ltp.o oper_32b.o p_ol_wgh.o \
+	ph_disp.o pitch_fr.o pitch_ol.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 r_fft.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 vad_reset.o weight_a.o \
+	window.o
 HDRS=	a_refl.h agc.h autocorr.h az_lsp.h b_cn_cod.h basic_op.h bgnscd.h \
 	bitno.h bits2prm.h c1035pf.h c2_11pf.h c2_9pf.h c3_14pf.h c4_17pf.h \
 	c8_31pf.h c_g_aver.h calc_cor.h calc_en.h cbsearch.h cl_ltp.h cnst.h \

--- a/libtwamr/e_homing.c	Tue May 07 03:50:25 2024 +0000
+++ b/libtwamr/e_homing.c	Tue May 07 04:51:04 2024 +0000
@@ -53,7 +53,7 @@
 ********************************************************************************
 */
 
-Word16 encoder_homing_frame_test (Word16 input_frame[])
+Word16 encoder_homing_frame_test (const Word16 input_frame[])
 {
     Word16 i, j;
 

--- a/libtwamr/e_homing.h	Tue May 07 03:50:25 2024 +0000
+++ b/libtwamr/e_homing.h	Tue May 07 04:51:04 2024 +0000
@@ -30,6 +30,6 @@
 ********************************************************************************
 */
 
-Word16 encoder_homing_frame_test (Word16 input_frame[]);
+Word16 encoder_homing_frame_test (const Word16 input_frame[]);
 
 #endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/enc_main.c	Tue May 07 04:51:04 2024 +0000
@@ -0,0 +1,64 @@
+/*
+ * This C module is the top level entity for our stateful encoder engine.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include "tw_amr.h"
+#include "namespace.h"
+#include "typedef.h"
+#include "cnst.h"
+#include "cod_amr.h"
+#include "pre_proc.h"
+#include "sid_sync.h"
+#include "e_homing.h"
+
+struct amr_encoder_state {
+	cod_amrState		cod;
+	Pre_ProcessState	pre;
+	sid_syncState		sid;
+};
+
+struct amr_encoder_state *amr_encoder_create(int dtx, int use_vad2)
+{
+	struct amr_encoder_state *st;
+
+	st = malloc(sizeof(struct amr_encoder_state));
+	if (st)
+		amr_encoder_reset(st, dtx, use_vad2);
+	return st;
+}
+
+void amr_encoder_reset(struct amr_encoder_state *st, int dtx, int use_vad2)
+{
+	cod_amr_reset(&st->cod, dtx, use_vad2);
+	Pre_Process_reset(&st->pre);
+	sid_sync_reset(&st->sid);
+}
+
+void amr_encode_frame(struct amr_encoder_state *st, enum Mode mode,
+			const int16_t *pcm, struct amr_param_frame *frame)
+{
+	Word16 new_speech[L_FRAME], syn[L_FRAME];
+	enum Mode used_mode;
+	enum TXFrameType tx_type;
+	Word16 i;
+
+	/* input */
+	for (i = 0; i < L_FRAME; i++)
+		new_speech[i] = pcm[i] & 0xFFF8;
+	Pre_Process(&st->pre, new_speech, L_FRAME);
+
+	/* main process */
+	cod_amr(&st->cod, mode, new_speech, frame->param, &used_mode, syn);
+	sid_sync(&st->sid, used_mode, &tx_type);
+	frame->type = tx_type;
+	if (tx_type != TX_NO_DATA)
+		frame->mode = mode;
+	else
+		frame->mode = 0xFF;
+
+	/* encoder homing */
+	if (encoder_homing_frame_test(pcm))
+		amr_encoder_reset(st, st->cod.dtx, st->cod.vadSt.use_vad2);
+}