Factor out decoder creation to a factory method.

1 files changed, 86 insertions, 0 deletions

diff --git a/src/lib/decoder_factory.cc b/src/lib/decoder_factory.cc
new file mode 100644
index 000000000..7f53c9a4b
--- /dev/null
+++ b/src/lib/decoder_factory.cc
@@ -0,0 +1,86 @@
+/*
+    Copyright (C) 2016 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "ffmpeg_content.h"
+#include "ffmpeg_decoder.h"
+#include "dcp_content.h"
+#include "dcp_decoder.h"
+#include "image_content.h"
+#include "image_decoder.h"
+#include "text_subtitle_content.h"
+#include "text_subtitle_decoder.h"
+#include "dcp_subtitle_content.h"
+#include "dcp_subtitle_decoder.h"
+#include "video_mxf_content.h"
+#include "video_mxf_decoder.h"
+#include <boost/foreach.hpp>
+
+using std::list;
+using boost::shared_ptr;
+using boost::dynamic_pointer_cast;
+
+shared_ptr<Decoder>
+decoder_factory (shared_ptr<const Content> content, list<shared_ptr<ImageDecoder> > old_image_decoders, shared_ptr<Log> log, bool fast)
+{
+	shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (content);
+	if (fc) {
+		return shared_ptr<Decoder> (new FFmpegDecoder (fc, log, fast));
+	}
+
+	shared_ptr<const DCPContent> dc = dynamic_pointer_cast<const DCPContent> (content);
+	if (dc) {
+		return shared_ptr<Decoder> (new DCPDecoder (dc, log, fast));
+	}
+
+	shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (content);
+	if (ic) {
+		shared_ptr<Decoder> decoder;
+
+		/* See if we can re-use an old ImageDecoder */
+		BOOST_FOREACH (shared_ptr<ImageDecoder> i, old_image_decoders) {
+			if (i->content() == ic) {
+				decoder = i;
+			}
+		}
+
+		if (!decoder) {
+			decoder.reset (new ImageDecoder (ic, log));
+		}
+
+		return decoder;
+	}
+
+	shared_ptr<const TextSubtitleContent> rc = dynamic_pointer_cast<const TextSubtitleContent> (content);
+	if (rc) {
+		return shared_ptr<Decoder> (new TextSubtitleDecoder (rc));
+	}
+
+	shared_ptr<const DCPSubtitleContent> dsc = dynamic_pointer_cast<const DCPSubtitleContent> (content);
+	if (dsc) {
+		return shared_ptr<Decoder> (new DCPSubtitleDecoder (dsc));
+	}
+
+	shared_ptr<const VideoMXFContent> vmc = dynamic_pointer_cast<const VideoMXFContent> (content);
+	if (vmc) {
+		return shared_ptr<Decoder> (new VideoMXFDecoder (vmc, log));
+	}
+
+	return shared_ptr<Decoder> ();
+}