--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcmu2efr/gen-amr-2fr.c	Sun May 12 04:24:15 2024 +0000
@@ -0,0 +1,42 @@
+/*
+ * The code in this module takes linear_input_array[] from gen160.c
+ * and generates EFR-format frames by way of libtwamr encoder.
+ * This version does a second frame pass on offsets 120-159.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <gsm_efr.h>
+#include <tw_amr.h>
+
+extern uint16_t linear_input_array[480];
+
+uint8_t amr_efr[160][31];
+
+void
+generate_amr_efr(void)
+{
+	struct amr_encoder_state *st;
+	struct amr_param_frame amr_frame;
+	unsigned m;
+
+	st = amr_encoder_create(0, 0);
+	if (!st) {
+		fprintf(stderr, "error: amr_encoder_create() failed\n");
+		exit(1);
+	}
+	for (m = 0; m < 160; m++) {
+		amr_encoder_reset(st, 0, 0);
+		amr_encode_frame(st, MR122,
+				 (const int16_t *) linear_input_array + 160 - m,
+				 &amr_frame);
+		if (m >= 120) {
+			amr_encode_frame(st, MR122,
+				(const int16_t *) linear_input_array + 320 - m,
+				 &amr_frame);
+		}
+		EFR_params2frame(amr_frame.param, amr_efr[m]);
+	}
+	free(st);
+}