decklink: Add a clock epoch that is used as offset whenever restarting the clock

Otherwise we're going to return times starting at 0 again after shutting down
an element for a specific input/output and then using it again later.

https://bugzilla.gnome.org/show_bug.cgi?id=755426

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/decklink/gstdecklink.cpp b/sys/decklink/gstdecklink.cpp
index f3ddeb907..eb39bdb46 100644
--- a/sys/decklink/gstdecklink.cpp
+++ b/sys/decklink/gstdecklink.cpp
@@ -885,6 +885,7 @@ gst_decklink_clock_get_internal_time (GstClock * clock)
 
       self->input->clock_last_time = result;
     }
+    result += self->input->clock_epoch;
     g_mutex_unlock (&self->input->lock);
   } else if (self->output != NULL) {
     g_mutex_lock (&self->output->lock);
@@ -924,6 +925,7 @@ gst_decklink_clock_get_internal_time (GstClock * clock)
 
       self->output->clock_last_time = result;
     }
+    result += self->output->clock_epoch;
     g_mutex_unlock (&self->output->lock);
   } else {
     g_assert_not_reached ();