diff --git a/libs/temporal/temporal/domain_provider.h b/libs/temporal/temporal/domain_provider.h
new file mode 100644
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+++ b/libs/temporal/temporal/domain_provider.h
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+/*
+    Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
+
+    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.
+*/
+
+#ifndef __temporal_domain_provider_h__
+#define __temporal_domain_provider_h__
+
+#include "temporal/types.h"
+
+namespace Temporal {
+
+class TimeDomainProvider {
+  public:
+	TimeDomainProvider () : have_domain (false), parent (nullptr) {}
+	TimeDomainProvider (TimeDomain td) : have_domain (true), domain (td), parent (nullptr) {}
+	TimeDomainProvider (TimeDomain td, TimeDomainProvider const & p) : have_domain (true), domain (td), parent (&p) {}
+	TimeDomainProvider (TimeDomainProvider const & p) : have_domain (false), parent (&p) {}
+	virtual ~TimeDomainProvider() {}
+
+	TimeDomain time_domain() const { if (have_domain) return domain; if (parent) return parent->time_domain(); return AudioTime; }
+	void set_time_domain (TimeDomain td) { have_domain = true; domain = td; }
+	void clear_time_domain () { have_domain = false; }
+
+  private:
+	bool have_domain;
+	TimeDomain domain;
+	TimeDomainProvider const * parent;
+};
+
+}
+
+#endif /* __temporal_domain_provider_h__ */