From 7121ecb1910f3afab555799bf53a2fdd12b127af Mon Sep 17 00:00:00 2001
From: XangelMusic <22012301+XangelMusic@users.noreply.github.com>
Date: Fri, 2 Feb 2024 03:59:20 +0800
Subject: [PATCH] fix(volume): Volume levels across dual-audio channels now
 kept for keep volume option (#1371)

---
 SoundSwitch.Audio.Manager/AudioSwitcher.cs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/SoundSwitch.Audio.Manager/AudioSwitcher.cs b/SoundSwitch.Audio.Manager/AudioSwitcher.cs
index 54c9c9c72f..291ab27c2d 100644
--- a/SoundSwitch.Audio.Manager/AudioSwitcher.cs
+++ b/SoundSwitch.Audio.Manager/AudioSwitcher.cs
@@ -200,6 +200,7 @@ public void SetVolumeFromDefaultDevice(DeviceInfo device)
             var currentDefault = GetMmDefaultAudioEndpoint((EDataFlow)device.Type, ERole.eConsole);
             if (currentDefault == null)
                 return;
+
             var audioInfo = InteractWithMmDevice(currentDefault, mmDevice =>
             {
                 var defaultDeviceAudioEndpointVolume = mmDevice.AudioEndpointVolume;
@@ -222,7 +223,15 @@ public void SetVolumeFromDefaultDevice(DeviceInfo device)
                 if (mmDevice.AudioEndpointVolume == null)
                     return nextDevice;
 
-                mmDevice.AudioEndpointVolume.MasterVolumeLevelScalar = audioInfo.Volume;
+                if (mmDevice.AudioEndpointVolume.Channels.Count == 2)
+                {
+                    mmDevice.AudioEndpointVolume.Channels[0].VolumeLevelScalar = audioInfo.Volume;
+                    mmDevice.AudioEndpointVolume.Channels[1].VolumeLevelScalar = audioInfo.Volume;
+                }
+                else
+                { 
+                    mmDevice.AudioEndpointVolume.MasterVolumeLevelScalar = audioInfo.Volume;
+                }
                 mmDevice.AudioEndpointVolume.Mute = audioInfo.IsMuted;
                 return mmDevice;
             });