Implemented music volume attenuation for Windows 10+

UnleashedRecomp/cfg/config.h

@@ -27,6 +27,7 @@ public:
     CONFIG_DEFINE_LOCALISED("Audio", float, SEVolume, 1.0f);
     CONFIG_DEFINE_ENUM_LOCALISED("Audio", EVoiceLanguage, VoiceLanguage, EVoiceLanguage::English);
     CONFIG_DEFINE_LOCALISED("Audio", bool, Subtitles, true);
+    CONFIG_DEFINE_LOCALISED("Audio", bool, MusicAttenuation, false);
     CONFIG_DEFINE_LOCALISED("Audio", bool, WerehogBattleMusic, true);
 
     CONFIG_DEFINE_ENUM("Video", EGraphicsAPI, GraphicsAPI, EGraphicsAPI::D3D12);

UnleashedRecomp/cfg/config_locale.h

@@ -207,6 +207,16 @@ CONFIG_DEFINE_DESCRIPTION_LOCALE(SEVolume)
     { ELanguage::English, "Adjust the volume for sound effects." }
 };
 
+CONFIG_DEFINE_LOCALE(MusicAttenuation)
+{
+    { ELanguage::English, "Music Attenuation" }
+};
+
+CONFIG_DEFINE_DESCRIPTION_LOCALE(MusicAttenuation)
+{
+    { ELanguage::English, "Fade out the game's music when external media is playing.\n\nRequires Windows 10 or later." }
+};
+
 CONFIG_DEFINE_LOCALE(VoiceLanguage)
 {
     { ELanguage::English, "Voice Language" }

UnleashedRecomp/patches/audio_patches.cpp

@@ -3,6 +3,42 @@
 #include <kernel/function.h>
 #include <patches/audio_patches.h>
 
+#if _WIN32
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.Media.Control.h>
+
+using namespace winrt;
+using namespace Windows::Foundation;
+using namespace Windows::Media::Control;
+
+GlobalSystemMediaTransportControlsSessionManager m_sessionManager = nullptr;
+
+GlobalSystemMediaTransportControlsSessionManager GetSessionManager()
+{
+    if (m_sessionManager)
+        return m_sessionManager;
+
+    init_apartment();
+
+    return m_sessionManager = GlobalSystemMediaTransportControlsSessionManager::RequestAsync().get();
+}
+
+GlobalSystemMediaTransportControlsSession GetCurrentSession()
+{
+    return GetSessionManager().GetCurrentSession();
+}
+
+bool IsExternalAudioPlaying()
+{
+    auto session = GetCurrentSession();
+
+    if (!session)
+        return false;
+
+    return session.GetPlaybackInfo().PlaybackStatus() == GlobalSystemMediaTransportControlsSessionPlaybackStatus::Playing;
+}
+#endif
+
 be<float>* GetVolume(bool isMusic = true)
 {
     auto ppUnkClass = (be<uint32_t>*)g_memory.Translate(0x83362FFC);
@@ -22,9 +58,28 @@ void audio_patches::Update(float deltaTime)
     if (!pMusicVolume || !pSEVolume)
         return;
 
-    *pSEVolume = Config::SEVolume;
+#if _WIN32
+    if (Config::MusicAttenuation)
+    {
+        auto time = 1.0f - expf(2.5f * -deltaTime);
+
+        if (IsExternalAudioPlaying())
+        {
+            *pMusicVolume = std::lerp(*pMusicVolume, 0.0f, time);
+        }
+        else
+        {
+            *pMusicVolume = std::lerp(*pMusicVolume, Config::MusicVolume, time);
+        }
+    }
+    else
+#endif
+    {
         *pMusicVolume = Config::MusicVolume;
     }
 
+    *pSEVolume = Config::SEVolume;
+}
+
 // Stub volume setter.
 GUEST_FUNCTION_STUB(sub_82E58728);

UnleashedRecomp/ui/options_menu.cpp

@@ -828,6 +828,7 @@ static void DrawConfigOptions()
         DrawConfigOption(rowCount++, yOffset, &Config::SEVolume);
         DrawConfigOption(rowCount++, yOffset, &Config::VoiceLanguage);
         DrawConfigOption(rowCount++, yOffset, &Config::Subtitles);
+        DrawConfigOption(rowCount++, yOffset, &Config::MusicAttenuation); // TODO: grey this out for non-Windows platforms.
         DrawConfigOption(rowCount++, yOffset, &Config::WerehogBattleMusic);
         break;
     case 3: // VIDEO