From e5599d1c8586bad49ae99ea47b58dd9cd73e145b Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 15 Sep 2021 17:34:41 +0200
Subject: [PATCH] Fix div/zero, allow switching backends

This is another attempt replacing 1288262ca7913528,
which performs better.
---
 libs/ardour/audioengine.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 31fc300145..1d79b03cc8 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -1230,6 +1230,9 @@ samplecnt_t
 AudioEngine::sample_rate () const
 {
 	if (!_backend) {
+		if (_session) {
+			return _session->nominal_sample_rate ();
+		}
 		return 0;
 	}
 	return _backend->sample_rate ();