MTC timing: compensate for audio latency.

[ardour.git] / libs / ardour / mtc_slave.cc

diff --git a/libs/ardour/mtc_slave.cc b/libs/ardour/mtc_slave.cc
index 906a0372a4737b9d7e2b8f53bc3d4143a046dbd3..cb35c0c7858eef717b6a557af931ce8fb04c9a24 100644 (file)
--- a/libs/ardour/mtc_slave.cc
+++ b/libs/ardour/mtc_slave.cc
@@ -113,10 +113,11 @@ MTC_Slave::update_mtc_time (const byte *msg, bool was_full)
                /* We received the last quarter frame 7 quarter frames (1.75 mtc
                   frames) after the instance when the contents of the mtc quarter
                   frames were decided. Add time to compensate for the elapsed 1.75
-                  frames 
+                  frames.
+                  Also compensate for audio latency. 
                */
 
-               mtc_frame += (long) (1.75 * session.frames_per_smpte_frame());
+               mtc_frame += (long) (1.75 * session.frames_per_smpte_frame()) + session.worst_output_latency();
                
                if (first_mtc_frame == 0) {
                        first_mtc_frame = mtc_frame;