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diff --git a/src/backend.h b/src/backend.h
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+// Copyright 2007-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef JALV_BACKEND_H
+#define JALV_BACKEND_H
+
+#include "attributes.h"
+#include "process.h"
+#include "settings.h"
+#include "types.h"
+#include "urids.h"
+
+#include <zix/attributes.h>
+#include <zix/sem.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+
+// Interface that must be implemented by audio/MIDI backends
+JALV_BEGIN_DECLS
+
+/// Allocate a new uninitialized backend
+ZIX_MALLOC_FUNC JalvBackend*
+jalv_backend_allocate(void);
+
+/// Free a backend allocated with jalv_backend_allocate()
+void
+jalv_backend_free(JalvBackend* backend);
+
+/// Open the audio/MIDI system
+int
+jalv_backend_open(JalvBackend*     backend,
+                  const JalvURIDs* urids,
+                  JalvSettings*    settings,
+                  JalvProcess*     process,
+                  ZixSem*          done,
+                  const char*      name,
+                  bool             exact_name);
+
+/// Close the audio/MIDI system
+void
+jalv_backend_close(JalvBackend* backend);
+
+/// Activate the backend and start processing audio
+void
+jalv_backend_activate(JalvBackend* backend);
+
+/// Deactivate the backend and stop processing audio
+void
+jalv_backend_deactivate(JalvBackend* backend);
+
+/// Expose a port to the system (if applicable) and connect it to its buffer
+void
+jalv_backend_activate_port(JalvBackend* backend,
+                           JalvProcess* process,
+                           uint32_t     port_index);
+
+/// Recompute latencies based on plugin port latencies if necessary
+void
+jalv_backend_recompute_latencies(JalvBackend* backend);
+
+JALV_END_DECLS
+
+#endif // JALV_BACKEND_H