Add zttest for measuring zaptel accuracy

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@380 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 79 insertions, 0 deletions

diff --git a/zttest.c b/zttest.c
new file mode 100755
index 0000000..86551a0
--- /dev/null
+++ b/zttest.c
@@ -0,0 +1,79 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/signal.h>
+#include <math.h>
+
+#define SIZE 8000
+
+static int pass = 0;
+static float best = 0.0;
+static float worst = 100.0;
+
+void hup_handler(int sig)
+{
+	printf("\n--- Results after %d passes ---\n", pass);
+	printf("Best: %f -- Worst: %f\n", best, worst);
+	exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+	int fd;
+	int res;
+	int count=0;
+	int ms;
+	int curarg = 1;
+	int verbose=0;
+	char buf[8192];
+	float score;
+	struct timeval start, now;
+	fd = open("/dev/zap/pseudo", O_RDWR);
+	if (fd < 0) {
+		fprintf(stderr, "Unable to open zap interface: %s\n", strerror(errno));
+		exit(1);
+	}
+	while(curarg < argc) {
+		if (!strcasecmp(argv[curarg], "-v"))
+			verbose++;
+		curarg++;
+	}
+	printf("Opened pseudo zap interface, measuring accuracy...\n");
+	signal(SIGHUP, hup_handler);
+	signal(SIGINT, hup_handler);
+	/* Flush input buffer */
+	for (count = 0;count < 4; count++)
+		res = read(fd, buf, sizeof(buf));
+	count = 0;
+	gettimeofday(&start, NULL);
+	for(;;) {
+		res = read(fd, buf, sizeof(buf));
+		if (res < 0) {
+			fprintf(stderr, "Failed to read from pseudo interface: %s\n", strerror(errno));
+			exit(1);
+		}
+		count += res;
+		if (count >= SIZE) {
+			gettimeofday(&now, NULL);
+			ms = (now.tv_sec - start.tv_sec) * 8000;
+			ms += (now.tv_usec - start.tv_usec) / 125;
+			start = now;
+			if (verbose)
+				printf("\n%d samples in %d sample intervals ", count, ms);
+			else if ((pass % 8) == 7) printf("\n");
+			score = 100.0 - 100.0 * fabs((float)count - (float)ms) / (float)count;
+			if (score > best)
+				best = score;
+			if (score < worst)
+				worst = score;
+			printf("%f%% ", score);
+			fflush(stdout);
+			count = 0;
+			pass++;
+		}
+	}
+}