From c6a23ddbf17d4b4862a227ba02822ffeafdfa979 Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Wed, 29 Sep 2021 10:33:31 -0400
Subject: [PATCH] Prevent multiple ASIO devices from being used simultaneously

---
 src/rtaudio.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/rtaudio.cpp b/src/rtaudio.cpp
index 2b0d7ee2..c5e98fec 100644
--- a/src/rtaudio.cpp
+++ b/src/rtaudio.cpp
@@ -334,6 +334,10 @@ struct RtAudioDriver : audio::Driver {
 		RtAudioDevice* device;
 		auto it = devices.find(deviceId);
 		if (it == devices.end()) {
+			// ASIO only allows one device to be used simultaneously
+			if (api == RtAudio::WINDOWS_ASIO && devices.size() >= 1)
+				throw Exception("ASIO driver only allows one audio device to be used simultaneously");
+
 			// Can throw Exception
 			device = new RtAudioDevice(api, deviceId);
 			devices[deviceId] = device;