1 files changed, 74 insertions, 0 deletions
diff --git a/src/lib/combiner.cc b/src/lib/combiner.cc
new file mode 100644
index 000000000..f7d634832
--- /dev/null
+++ b/src/lib/combiner.cc
@@ -0,0 +1,74 @@
+/*
+    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 "combiner.h"
+#include "image.h"
+
+using boost::shared_ptr;
+
+Combiner::Combiner (shared_ptr<Log> log)
+	: TimedVideoProcessor (log)
+{
+
+}
+
+/** Process video for the left half of the frame.
+ *  Subtitle parameter will be ignored.
+ *  @param image Frame image.
+ */
+void
+Combiner::process_video (shared_ptr<const Image> image, bool, shared_ptr<Subtitle>, double)
+{
+	_image.reset (new SimpleImage (image));
+}
+
+/** Process video for the right half of the frame.
+ *  @param image Frame image.
+ *  @param sub Subtitle (which will be put onto the whole frame)
+ */
+void
+Combiner::process_video_b (shared_ptr<const Image> image, bool, shared_ptr<Subtitle> sub, double t)
+{
+	if (!_image) {
+		/* It's possible for filters in the A-side to mean that we get a B frame
+		   before any A; just skip the B frame in that case.  This at least prevents
+		   a crash, but may not be right.
+		*/
+		return;
+	}
+	
+	/* Copy the right half of this image into our _image */
+	/* XXX: this should probably be in the Image class */
+	for (int i = 0; i < image->components(); ++i) {
+		int const line_size = image->line_size()[i];
+		int const half_line_size = line_size / 2;
+
+		uint8_t* p = _image->data()[i];
+		uint8_t* q = image->data()[i];
+			
+		for (int j = 0; j < image->lines (i); ++j) {
+			memcpy (p + half_line_size, q + half_line_size, half_line_size);
+			p += _image->stride()[i];
+			q += image->stride()[i];
+		}
+	}
+
+	Video (_image, false, sub, t);
+	_image.reset ();
+}