Add subtitle analysis so that the outline of all subtitles

in a piece of content can be overlaid onto the preview (#1233).

1 files changed, 75 insertions, 0 deletions

diff --git a/src/lib/subtitle_analysis.cc b/src/lib/subtitle_analysis.cc
new file mode 100644
index 000000000..91fec90b0
--- /dev/null
+++ b/src/lib/subtitle_analysis.cc
@@ -0,0 +1,75 @@
+/*
+    Copyright (C) 2020 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 "subtitle_analysis.h"
+#include "exceptions.h"
+#include <libcxml/cxml.h>
+#include <dcp/raw_convert.h>
+#include <libxml++/libxml++.h>
+
+using std::string;
+using dcp::raw_convert;
+using boost::shared_ptr;
+
+int const SubtitleAnalysis::_current_state_version = 1;
+
+
+SubtitleAnalysis::SubtitleAnalysis (boost::filesystem::path path)
+{
+	cxml::Document f ("SubtitleAnalysis");
+
+	f.read_file (path);
+
+	if (f.optional_number_child<int>("Version").get_value_or(1) < _current_state_version) {
+		/* Too old.  Throw an exception so that this analysis is re-run. */
+		throw OldFormatError ("Audio analysis file is too old");
+	}
+
+	cxml::NodePtr bounding_box = f.optional_node_child("BoundingBox");
+	if (bounding_box) {
+		_bounding_box = dcpomatic::Rect<double> ();
+		_bounding_box->x = bounding_box->number_child<double>("X");
+		_bounding_box->y = bounding_box->number_child<double>("Y");
+		_bounding_box->width = bounding_box->number_child<double>("Width");
+		_bounding_box->height = bounding_box->number_child<double>("Height");
+	}
+}
+
+
+void
+SubtitleAnalysis::write (boost::filesystem::path path) const
+{
+	shared_ptr<xmlpp::Document> doc (new xmlpp::Document);
+	xmlpp::Element* root = doc->create_root_node ("SubtitleAnalysis");
+
+	root->add_child("Version")->add_child_text (raw_convert<string>(_current_state_version));
+
+	if (_bounding_box) {
+		xmlpp::Element* bounding_box = root->add_child("BoundingBox");
+		bounding_box->add_child("X")->add_child_text(raw_convert<string>(_bounding_box->x));
+		bounding_box->add_child("Y")->add_child_text(raw_convert<string>(_bounding_box->y));
+		bounding_box->add_child("Width")->add_child_text(raw_convert<string>(_bounding_box->width));
+		bounding_box->add_child("Height")->add_child_text(raw_convert<string>(_bounding_box->height));
+	}
+
+	doc->write_to_file_formatted (path.string());
+}
+
+