--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcmu2efr/dhf-check.c	Sun May 12 03:06:12 2024 +0000
@@ -0,0 +1,46 @@
+/*
+ * This program generates both standard-EFR and AMR-EFR versions of
+ * sample-shifted first encoder frame, and checks them against
+ * both EFR and MR122 DHFs.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <gsm_efr.h>
+#include <tw_amr.h>
+
+extern uint8_t standard_efr[160][31];
+extern uint8_t amr_efr[160][31];
+
+static void
+check_for_dhf(efr_frame, name, num)
+	uint8_t *efr_frame;
+	char *name;
+	unsigned num;
+{
+	int16_t params[EFR_NUM_PARAMS];
+
+	EFR_frame2params(efr_frame, params);
+	if (!bcmp(params, amr_dhf_gsmefr, EFR_NUM_PARAMS * sizeof(int16_t)))
+		printf("%s frame %u matches EFR DHF\n", name, num);
+	else if (!bcmp(params, amr_dhf_mr122, EFR_NUM_PARAMS * sizeof(int16_t)))
+		printf("%s frame %u matches MR122 DHF\n", name, num);
+}
+
+main(argc, argv)
+	char **argv;
+{
+	unsigned n;
+
+	generate_linear_inputs();
+	generate_std_efr();
+	generate_amr_efr();
+	for (n = 0; n < 160; n++)
+		check_for_dhf(standard_efr[n], "std EFR", n);
+	for (n = 0; n < 120; n++)
+		check_for_dhf(amr_efr[n], "AMR-EFR", n);
+	exit(0);
+}