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diff --git a/src/types.h b/src/types.h
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+// Copyright 2007-2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef JALV_TYPES_H
+#define JALV_TYPES_H
+
+#include "attributes.h"
+
+JALV_BEGIN_DECLS
+
+/// Backend playing state
+typedef enum { JALV_RUNNING, JALV_PAUSE_REQUESTED, JALV_PAUSED } JalvPlayState;
+
+/// "Global" application state
+typedef struct JalvImpl Jalv;
+
+/// Audio/MIDI backend
+typedef struct JalvBackendImpl JalvBackend;
+
+JALV_END_DECLS
+
+#endif // JALV_TYPES_H