--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmw/gen-dmw-bin.c	Sun Apr 07 07:20:23 2024 +0000
@@ -0,0 +1,44 @@
+/*
+ * This program generates a binary G.711 file containing the standard
+ * DMW (digital milliwatt) sequence repeated for the specified number
+ * of times; the number of repetitions will be the total duration
+ * of the output in milliseconds.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+static uint8_t dmw_alaw[8] = {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
+static uint8_t dmw_ulaw[8] = {0x1E, 0x0B, 0x0B, 0x1E, 0x9E, 0x8B, 0x8B, 0x9E};
+
+main(argc, argv)
+	char **argv;
+{
+	FILE *outf;
+	unsigned total_ms, n;
+	uint8_t *seq;
+
+	if (argc != 4) {
+usage:		fprintf(stderr, "usage: outfile alaw|ulaw number-of-ms\n",
+			argv[0]);
+		exit(1);
+	}
+	outf = fopen(argv[1], "w");
+	if (!outf) {
+		perror(argv[1]);
+		exit(1);
+	}
+	if (!strcmp(argv[2], "alaw"))
+		seq = dmw_alaw;
+	else if (!strcmp(argv[2], "ulaw"))
+		seq = dmw_ulaw;
+	else
+		goto usage;
+	total_ms = atoi(argv[3]);
+	for (n = 0; n < total_ms; n++)
+		fwrite(seq, 1, 8, outf);
+	exit(0);
+}