From 135c20137c06a800c8b33f8bd9ea0b5c14aaeb2d Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Mon, 25 Dec 2023 14:54:50 +0900
Subject: [PATCH] Isolate wasapi initialisation to windows platform

---
 osu.Framework/Threading/AudioThread.cs | 72 ++++++++++++++------------
 1 file changed, 39 insertions(+), 33 deletions(-)

diff --git a/osu.Framework/Threading/AudioThread.cs b/osu.Framework/Threading/AudioThread.cs
index 491ee118c27..5086818f671 100644
--- a/osu.Framework/Threading/AudioThread.cs
+++ b/osu.Framework/Threading/AudioThread.cs
@@ -122,49 +122,55 @@ internal static bool InitDevice(int deviceId)
             Trace.Assert(deviceId != -1); // The real device ID should always be used, as the -1 device has special cases which are hard to work with.
 
             // Try to initialise the device, or request a re-initialise.
-            if (Bass.Init(deviceId, Flags: (DeviceInitFlags)128)) // 128 == BASS_DEVICE_REINIT
-            {
-                int wasapiDevice = -1;
+            if (!Bass.Init(deviceId, Flags: (DeviceInitFlags)128)) // 128 == BASS_DEVICE_REINIT
+                return false;
 
-                if (Bass.CurrentDevice > 0)
-                {
-                    string driver = Bass.GetDeviceInfo(Bass.CurrentDevice).Driver;
+            attemptWasapiInitialisation();
 
-                    if (!string.IsNullOrEmpty(driver))
-                    {
-                        while (true)
-                        {
-                            if (!BassWasapi.GetDeviceInfo(++wasapiDevice, out WasapiDeviceInfo info))
-                                break;
-
-                            if (info.ID == driver)
-                                break;
-                        }
-                    }
-                }
+            initialised_devices.Add(deviceId);
+            return true;
+        }
 
-                if (WasapiMixer != 0)
-                {
-                    Bass.StreamFree(WasapiMixer);
-                    BassWasapi.Free();
-                    WasapiMixer = 0;
-                }
+        private static void attemptWasapiInitialisation()
+        {
+            if (RuntimeInfo.OS != RuntimeInfo.Platform.Windows)
+                return;
 
-                wasapiProcedure = (buffer, length, _) => Bass.ChannelGetData(WasapiMixer, buffer, length);
-                usingWasapi = BassWasapi.Init(wasapiDevice, Procedure: wasapiProcedure, Buffer: 0.02f, Period: 0.005f);
+            int wasapiDevice = -1;
 
-                if (usingWasapi)
+            if (Bass.CurrentDevice > 0)
+            {
+                string driver = Bass.GetDeviceInfo(Bass.CurrentDevice).Driver;
+
+                if (!string.IsNullOrEmpty(driver))
                 {
-                    BassWasapi.GetInfo(out var wasapiInfo);
-                    WasapiMixer = BassMix.CreateMixerStream(wasapiInfo.Frequency, wasapiInfo.Channels, BassFlags.MixerNonStop | BassFlags.Decode | BassFlags.Float);
-                    BassWasapi.Start();
+                    while (true)
+                    {
+                        if (!BassWasapi.GetDeviceInfo(++wasapiDevice, out WasapiDeviceInfo info))
+                            break;
+
+                        if (info.ID == driver)
+                            break;
+                    }
                 }
+            }
 
-                initialised_devices.Add(deviceId);
-                return true;
+            if (WasapiMixer != 0)
+            {
+                Bass.StreamFree(WasapiMixer);
+                BassWasapi.Free();
+                WasapiMixer = 0;
             }
 
-            return false;
+            wasapiProcedure = (buffer, length, _) => Bass.ChannelGetData(WasapiMixer, buffer, length);
+            usingWasapi = BassWasapi.Init(wasapiDevice, Procedure: wasapiProcedure, Buffer: 0.02f, Period: 0.005f);
+
+            if (usingWasapi)
+            {
+                BassWasapi.GetInfo(out var wasapiInfo);
+                WasapiMixer = BassMix.CreateMixerStream(wasapiInfo.Frequency, wasapiInfo.Channels, BassFlags.MixerNonStop | BassFlags.Decode | BassFlags.Float);
+                BassWasapi.Start();
+            }
         }
 
         internal static void FreeDevice(int deviceId)