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diff --git a/src/backend.h b/src/backend.h
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+// Copyright 2007-2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef JALV_BACKEND_H
+#define JALV_BACKEND_H
+
+#include "attributes.h"
+#include "types.h"
+
+#include <stdint.h>
+
+JALV_BEGIN_DECLS
+
+// Interface that must be implemented by audio/MIDI backends
+
+/// Initialize the audio and MIDI systems
+JalvBackend*
+jalv_backend_init(Jalv* jalv);
+
+/// Activate the backend and start processing audio
+void
+jalv_backend_activate(Jalv* jalv);
+
+/// Deactivate the backend and stop processing audio
+void
+jalv_backend_deactivate(Jalv* jalv);
+
+/// Close the backend
+void
+jalv_backend_close(Jalv* jalv);
+
+/// Expose a port to the system (if applicable) and connect it to its buffer
+void
+jalv_backend_activate_port(Jalv* jalv, uint32_t port_index);
+
+JALV_END_DECLS
+
+#endif // JALV_BACKEND_H