Allow the butler to say "try again later" when get_video() is called

while it's suspended.  Then make the GUI follow that suggestion.
Should

1 files changed, 12 insertions, 2 deletions

diff --git a/src/lib/butler.cc b/src/lib/butler.cc
index a127ee9bd..3e408c4d5 100644
--- a/src/lib/butler.cc
+++ b/src/lib/butler.cc
@@ -190,17 +190,27 @@ try
 }
 
 pair<shared_ptr<PlayerVideo>, DCPTime>
-Butler::get_video ()
+Butler::get_video (Error* e)
 {
 	boost::mutex::scoped_lock lm (_mutex);
 
+	if (_suspended) {
+		if (e) {
+			*e = AGAIN;
+		}
+		return make_pair(shared_ptr<PlayerVideo>(), DCPTime());
+	}
+
 	/* Wait for data if we have none */
 	while (_video.empty() && !_finished && !_died) {
 		_arrived.wait (lm);
 	}
 
 	if (_video.empty()) {
-		return make_pair (shared_ptr<PlayerVideo>(), DCPTime());
+		if (e) {
+			*e = NONE;
+		}
+		return make_pair(shared_ptr<PlayerVideo>(), DCPTime());
 	}
 
 	pair<shared_ptr<PlayerVideo>, DCPTime> const r = _video.get ();