avsync: pause will also take effect on main video

Change-Id: Ifcbe49aaf451906bb31caf1c7607e6170a7b315f
diff --git a/avsync-lib/src/avsync.c b/avsync-lib/src/avsync.c
index dc64afa..9cd0c0b 100644
--- a/avsync-lib/src/avsync.c
+++ b/avsync-lib/src/avsync.c
@@ -441,6 +441,9 @@
     bool expire = false;
     uint32_t pts_correction = avsync->delay * avsync->vsync_interval;
 
+    if (avsync->paused)
+        return false;
+
     if (!fpts) {
         if (avsync->last_frame) {
             /* try to accumulate duration as PTS */