Basics of FFmpeg examiner works.

[dcpomatic.git] / src / lib / video_source.cc

diff --git a/src/lib/video_source.cc b/src/lib/video_source.cc
index 87b33026e109a1b053bed6ae27d69d6f51d4a4e4..824587bcbc0e33c0009a854dd22c2abb062d4357 100644 (file)
--- a/src/lib/video_source.cc
+++ b/src/lib/video_source.cc
@@ -1,11 +1,44 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
 #include "video_source.h"
 #include "video_sink.h"
 
 using boost::shared_ptr;
+using boost::weak_ptr;
 using boost::bind;
 
+static void
+process_video_proxy (weak_ptr<VideoSink> sink, shared_ptr<const Image> image, bool same, Time time)
+{
+       shared_ptr<VideoSink> p = sink.lock ();
+       if (p) {
+               p->process_video (image, same, time);
+       }
+}
+
 void
 VideoSource::connect_video (shared_ptr<VideoSink> s)
 {
-       Video.connect (bind (&VideoSink::process_video, s, _1, _2));
+       /* If we bind, say, a Player (as the VideoSink) to a Decoder (which is owned
+          by the Player) we create a cycle.  Use a weak_ptr to break it.
+       */
+       Video.connect (bind (process_video_proxy, weak_ptr<VideoSink> (s), _1, _2, _3));
 }
+