--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/amrdiff/readone-amr.c	Wed Apr 03 19:41:45 2024 +0000
@@ -0,0 +1,50 @@
+/*
+ * This program reads a single frame (the first one) from an AMR *.cod file,
+ * enforces that this frame is MR122 speech, and emits the frame of 244 bits
+ * as comma-separated ASCII.  The intent is to extract the DHF in a form
+ * convenient for inclusion in amrdiff source.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "amr_defs.h"
+
+main(argc, argv)
+	char **argv;
+{
+	char *filename;
+	int bigend, rc;
+	FILE *inf;
+	uint8_t amr_bits[COD_FORMAT_NWORDS];
+
+	if (argc != 3) {
+usage:		fprintf(stderr, "usage: %s amr-cod-file be|le\n", argv[0]);
+		exit(1);
+	}
+	filename = argv[1];
+	if (!strcmp(argv[2], "be"))
+		bigend = 1;
+	else if (!strcmp(argv[2], "le"))
+		bigend = 0;
+	else
+		goto usage;
+	inf = fopen(filename, "r");
+	if (!inf) {
+		perror(filename);
+		exit(1);
+	}
+	rc = read_etsi_bits(inf, bigend, amr_bits, COD_FORMAT_NWORDS, filename);
+	if (!rc) {
+		fprintf(stderr, "error: %s is empty\n", filename);
+		exit(1);
+	}
+	if (amr_bits[0] != TX_SPEECH_GOOD || amr_bits[245] != MR122) {
+		fprintf(stderr, "error: frame type is wrong\n");
+		exit(1);
+	}
+	emit_frame244(amr_bits + 1);
+	exit(0);
+}