X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fvideo_frame.cc;h=e7c6a226aed47355f272aaf6d052bad7915d482e;hb=45d5a5004a49edabbc96cd1acba12e08d31510f1;hp=e2223ff9ec2132d65f3b8a85d3c4d6e2122ba7ba;hpb=4b7b0edb359ae68f2dbcab90c7c10382f507fa5b;p=dcpomatic.git

diff --git a/src/lib/video_frame.cc b/src/lib/video_frame.cc
index e2223ff9e..e7c6a226a 100644
--- a/src/lib/video_frame.cc
+++ b/src/lib/video_frame.cc
@@ -19,6 +19,7 @@
 */
 
 #include "video_frame.h"
+#include "dcpomatic_assert.h"
 
 VideoFrame &
 VideoFrame::operator++ ()
@@ -46,3 +47,31 @@ operator!= (VideoFrame const & a, VideoFrame const & b)
 {
 	return !(a == b);
 }
+
+bool
+operator> (VideoFrame const & a, VideoFrame const & b)
+{
+	if (a.index() != b.index()) {
+		return a.index() > b.index();
+	}
+
+	/* indexes are the same */
+
+	if (a.eyes() == b.eyes()) {
+		return false;
+	}
+
+	/* eyes are not the same */
+
+	if (a.eyes() == EYES_LEFT && b.eyes() == EYES_RIGHT) {
+		return false;
+	}
+
+	if (a.eyes() == EYES_RIGHT && b.eyes() == EYES_LEFT) {
+		return true;
+	}
+
+	/* should never get here; we are comparing 2D with 3D */
+
+	DCPOMATIC_ASSERT (false);
+}