From 6b2a8eff15bffc1dc6831d236032c751f426eb13 Mon Sep 17 00:00:00 2001
From: Dentomologist <dentomologist@gmail.com>
Date: Sat, 21 Mar 2026 13:37:22 -0700
Subject: [PATCH] AudioPane: Fix WASAPI default device combo selection

Set the default value of `Config::MAIN_WASAPI_DEVICE` to `default`
instead of `Default`. This fixes an issue where `AudioPane`'s `Output
Device` combo would be blank if `WASAPI` was selected and the user had
never changed the value of `Output Device`.

We don't have to worry about backward compatibility with users who have
`Default` in their config because config values aren't written unless
they've been changed at some point from the default, and the combo has
always saved `default` instead of `Default`.

Audio still worked during emulation in this situation because the
fallback for an unrecognized device name is the default device.

To help prevent similar situations in the future references to
`MAIN_WASAPI_DEVICE`'s default value now call `GetDefaultValue` instead
of hardcoding the expected default, or use the new helper function
`Config::IsDefaultValue`.
---
 Source/Core/AudioCommon/WASAPIStream.cpp     | 2 +-
 Source/Core/Common/Config/Config.h           | 6 ++++++
 Source/Core/Core/Config/MainSettings.cpp     | 2 +-
 Source/Core/DolphinQt/Settings/AudioPane.cpp | 5 +++--
 Source/Core/UICommon/DiscordPresence.cpp     | 2 +-
 5 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Source/Core/AudioCommon/WASAPIStream.cpp b/Source/Core/AudioCommon/WASAPIStream.cpp
index afd5531ae8..9cbf915e82 100644
--- a/Source/Core/AudioCommon/WASAPIStream.cpp
+++ b/Source/Core/AudioCommon/WASAPIStream.cpp
@@ -176,7 +176,7 @@ bool WASAPIStream::SetRunning(bool running)
 
     HRESULT result;
 
-    if (Config::Get(Config::MAIN_WASAPI_DEVICE) == "default")
+    if (Config::IsDefaultValue(Config::MAIN_WASAPI_DEVICE))
     {
       result = m_enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
     }
diff --git a/Source/Core/Common/Config/Config.h b/Source/Core/Common/Config/Config.h
index d8a2a9a691..b749986f7e 100644
--- a/Source/Core/Common/Config/Config.h
+++ b/Source/Core/Common/Config/Config.h
@@ -135,6 +135,12 @@ void DeleteKey(LayerType layer, const Info<T>& info)
     OnConfigChanged();
 }
 
+template <typename T>
+bool IsDefaultValue(const Info<T>& info)
+{
+  return Get(info) == info.GetDefaultValue();
+}
+
 // Used to defer OnConfigChanged until after the completion of many config changes.
 class ConfigChangeCallbackGuard
 {
diff --git a/Source/Core/Core/Config/MainSettings.cpp b/Source/Core/Core/Config/MainSettings.cpp
index 3d46d756bf..147aeedf50 100644
--- a/Source/Core/Core/Config/MainSettings.cpp
+++ b/Source/Core/Core/Config/MainSettings.cpp
@@ -319,7 +319,7 @@ const Info<bool> MAIN_AUDIO_MUTED{{System::Main, "DSP", "Muted"}, false};
 const Info<bool> MAIN_AUDIO_MUTE_ON_DISABLED_SPEED_LIMIT{
     {System::Main, "DSP", "MuteOnDisabledSpeedLimit"}, false};
 #ifdef _WIN32
-const Info<std::string> MAIN_WASAPI_DEVICE{{System::Main, "DSP", "WASAPIDevice"}, "Default"};
+const Info<std::string> MAIN_WASAPI_DEVICE{{System::Main, "DSP", "WASAPIDevice"}, "default"};
 #endif
 
 bool ShouldUseDPL2Decoder()
diff --git a/Source/Core/DolphinQt/Settings/AudioPane.cpp b/Source/Core/DolphinQt/Settings/AudioPane.cpp
index 435e8f24d5..e48faa7c01 100644
--- a/Source/Core/DolphinQt/Settings/AudioPane.cpp
+++ b/Source/Core/DolphinQt/Settings/AudioPane.cpp
@@ -123,8 +123,9 @@ void AudioPane::CreateWidgets()
 
 #ifdef _WIN32
   std::vector<std::pair<QString, QString>> wasapi_options;
-  wasapi_options.push_back(
-      std::pair<QString, QString>{tr("Default Device"), QStringLiteral("default")});
+  const auto default_device_config_value =
+      QString::fromStdString(Config::MAIN_WASAPI_DEVICE.GetDefaultValue());
+  wasapi_options.emplace_back(tr("Default Device"), default_device_config_value);
 
   for (auto string : WASAPIStream::GetAvailableDevices())
   {
diff --git a/Source/Core/UICommon/DiscordPresence.cpp b/Source/Core/UICommon/DiscordPresence.cpp
index 80436f6439..1be073a4ca 100644
--- a/Source/Core/UICommon/DiscordPresence.cpp
+++ b/Source/Core/UICommon/DiscordPresence.cpp
@@ -55,7 +55,7 @@ void HandleDiscordJoin(const char* join_secret)
   if (event_handler == nullptr)
     return;
 
-  if (Config::Get(Config::NETPLAY_NICKNAME) == Config::NETPLAY_NICKNAME.GetDefaultValue())
+  if (Config::IsDefaultValue(Config::NETPLAY_NICKNAME))
     Config::SetCurrent(Config::NETPLAY_NICKNAME, username);
 
   std::string secret(join_secret);