Implement audio sync foundations

app/codec/timecodemetadata.h

@@ -0,0 +1,48 @@
+/***
+
+  Oak - Non-Linear Video Editor
+  Copyright (C) 2026 Oak Team
+
+  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 3 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, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef TIMECODEMETADATA_H
+#define TIMECODEMETADATA_H
+
+#include <QString>
+
+#include "olive/core/util/rational.h"
+
+namespace olive
+{
+
+class TimecodeMetadata {
+public:
+	struct SourceTime {
+		core::rational time;
+		QString source;
+		bool valid = false;
+	};
+
+	static SourceTime FromTimecodeString(const QString &timecode,
+										 const core::rational &timebase);
+
+	static SourceTime FromBwfTimeReference(const QString &time_reference,
+										   int sample_rate);
+};
+
+}
+
+#endif // TIMECODEMETADATA_H