From edf449b708f1232b48b5aadcfbe8c5b6cc12a7d1 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sun, 6 Feb 2022 18:00:14 -0600
Subject: [PATCH] Cap selected channel count at physical maximum

---
 Limelight/ViewControllers/MainFrameViewController.m | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Limelight/ViewControllers/MainFrameViewController.m b/Limelight/ViewControllers/MainFrameViewController.m
index 508ce446..968d0151 100644
--- a/Limelight/ViewControllers/MainFrameViewController.m
+++ b/Limelight/ViewControllers/MainFrameViewController.m
@@ -631,9 +631,13 @@ static NSMutableSet* hostList;
     // multiController must be set before calling getConnectedGamepadMask
     _streamConfig.multiController = streamSettings.multiController;
     _streamConfig.gamepadMask = [ControllerSupport getConnectedGamepadMask:_streamConfig];
-
-    int numberOfChannels = [streamSettings.audioConfig intValue];
-    Log(LOG_I, @"Number of audio channels %d", numberOfChannels);
+        
+    // Probe for supported channel configurations
+    int physicalOutputChannels = (int)[AVAudioSession sharedInstance].maximumOutputNumberOfChannels;
+    Log(LOG_I, @"Audio device supports %d channels", physicalOutputChannels);
+    
+    int numberOfChannels = MIN([streamSettings.audioConfig intValue], physicalOutputChannels);
+    Log(LOG_I, @"Selected number of audio channels %d", numberOfChannels);
     if (numberOfChannels >= 8) {
         _streamConfig.audioConfiguration = AUDIO_CONFIGURATION_71_SURROUND;
     }