Extract frame info read/write to new class.

1 files changed, 84 insertions, 0 deletions

diff --git a/src/lib/frame_info.cc b/src/lib/frame_info.cc
new file mode 100644
index 000000000..f348bca6a
--- /dev/null
+++ b/src/lib/frame_info.cc
@@ -0,0 +1,84 @@
+/*
+    Copyright (C) 2024 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 "frame_info.h"
+#include <string>
+
+
+using std::shared_ptr;
+using std::string;
+
+
+J2KFrameInfo::J2KFrameInfo(uint64_t offset_, uint64_t size_, string hash_)
+	: dcp::J2KFrameInfo(offset_, size_, hash_)
+{
+
+}
+
+
+J2KFrameInfo::J2KFrameInfo(dcp::J2KFrameInfo const& info)
+	: dcp::J2KFrameInfo(info)
+{
+
+}
+
+
+J2KFrameInfo::J2KFrameInfo(shared_ptr<InfoFileHandle> info_file, Frame frame, Eyes eyes)
+{
+	info_file->get().seek(position(frame, eyes), SEEK_SET);
+	info_file->get().checked_read(&offset, sizeof(offset));
+	info_file->get().checked_read(&size, sizeof(size));
+
+	char hash_buffer[33];
+	info_file->get().checked_read(hash_buffer, 32);
+	hash_buffer[32] = '\0';
+	hash = hash_buffer;
+}
+
+
+long
+J2KFrameInfo::position(Frame frame, Eyes eyes) const
+{
+	switch (eyes) {
+	case Eyes::BOTH:
+		return frame * _size_on_disk;
+	case Eyes::LEFT:
+		return frame * _size_on_disk * 2;
+	case Eyes::RIGHT:
+		return frame * _size_on_disk * 2 + _size_on_disk;
+	default:
+		DCPOMATIC_ASSERT(false);
+	}
+
+	DCPOMATIC_ASSERT(false);
+}
+
+
+/** @param frame reel-relative frame */
+void
+J2KFrameInfo::write(shared_ptr<InfoFileHandle> info_file, Frame frame, Eyes eyes) const
+{
+	info_file->get().seek(position(frame, eyes), SEEK_SET);
+	info_file->get().checked_write(&offset, sizeof(offset));
+	info_file->get().checked_write(&size, sizeof(size));
+	info_file->get().checked_write(hash.c_str(), hash.size());
+}
+