From 54bc9f0ddeab40c7b0f2b6ce3df036fcbd3299a1 Mon Sep 17 00:00:00 2001
From: paul <paul@0c269be4-1314-0410-8aa9-9f06e86f4224>
Date: Wed, 13 Jul 2011 12:52:41 +0000
Subject: [PATCH] make the printed output of jack_iodelay more useful to actual
 users

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4486 0c269be4-1314-0410-8aa9-9f06e86f4224
---
 tools/iodelay.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/iodelay.c b/tools/iodelay.c
index fe56180..dd8a6ea 100644
--- a/tools/iodelay.c
+++ b/tools/iodelay.c
@@ -237,12 +237,17 @@ int main (int ac, char *av [])
         if (mtdm_resolve (mtdm) < 0) printf ("Signal below threshold...\n");
         else 
         {
+            jack_nframes_t systemic_latency;
+
             if (mtdm->_err > 0.3) 
             {
                 mtdm_invert ( mtdm );
                 mtdm_resolve ( mtdm );
             }
-            printf ("%10.3lf frames %10.3lf ms", mtdm->_del, mtdm->_del * t);
+            systemic_latency = (jack_nframes_t) floor (mtdm->_del - (capture_latency.max + playback_latency.max));
+
+            printf ("%10.3lf frames %10.3lf ms total roundtrip latency\n\textra loopback latency: %u frames\n\tuse %u for the backend arguments -I and -O", mtdm->_del, mtdm->_del * t, 
+                    systemic_latency, systemic_latency/2);
             if (mtdm->_err > 0.2) printf (" ??");
                 if (mtdm->_inv) printf (" Inv");
             printf ("\n");