--- /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);
+}