Add option to mute audio on minimize and background gamepad input

Fixes #461

app/streaming/audio/audio.cpp

@@ -197,6 +197,11 @@ void Session::arDecodeAndPlaySample(char* sampleData, int sampleLength)
 
     s_ActiveSession->m_AudioSampleCount++;
 
+    // If audio is muted, don't decode or play the audio
+    if (s_ActiveSession->m_AudioMuted) {
+        return;
+    }
+
     if (s_ActiveSession->m_AudioRenderer != nullptr) {
         int desiredSize = sizeof(short) * s_ActiveSession->m_AudioConfig.samplesPerFrame * s_ActiveSession->m_AudioConfig.channelCount;
         void* buffer = s_ActiveSession->m_AudioRenderer->getAudioBuffer(&desiredSize);

app/streaming/input/input.cpp

@@ -30,8 +30,8 @@ SdlInputHandler::SdlInputHandler(StreamingPreferences& prefs, NvComputer*, int s
       m_DragButton(0),
       m_NumFingersDown(0)
 {
-    // Allow gamepad input when the app doesn't have focus
-    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
+    // Allow gamepad input when the app doesn't have focus if requested
+    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, prefs.backgroundGamepad ? "1" : "0");
 
     // If absolute mouse mode is enabled, use relative mode warp (which
     // is via normal motion events that are influenced by mouse acceleration).

app/streaming/session.cpp

@@ -370,6 +370,7 @@ Session::Session(NvComputer* computer, NvApp& app, StreamingPreferences *prefere
       m_DecoderLock(0),
       m_NeedsIdr(false),
       m_AudioDisabled(false),
+      m_AudioMuted(false),
       m_DisplayOriginX(0),
       m_DisplayOriginY(0),
       m_PendingWindowedTransition(false),
@@ -1318,11 +1319,25 @@ void Session::exec(int displayOriginX, int displayOriginY)
             break;
 
         case SDL_WINDOWEVENT:
-            if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST) {
+            // Early handling of some events
+            switch (event.window.event) {
+            case SDL_WINDOWEVENT_FOCUS_LOST:
                 m_InputHandler->notifyFocusLost();
-            }
-            else if (event.window.event == SDL_WINDOWEVENT_LEAVE) {
+                break;
+            case SDL_WINDOWEVENT_LEAVE:
                 m_InputHandler->notifyMouseLeave();
+                break;
+            case SDL_WINDOWEVENT_MINIMIZED:
+                if (m_Preferences->muteOnMinimize) {
+                    m_AudioMuted = true;
+                }
+                break;
+            case SDL_WINDOWEVENT_MAXIMIZED:
+            case SDL_WINDOWEVENT_RESTORED:
+                if (m_Preferences->muteOnMinimize) {
+                    m_AudioMuted = false;
+                }
+                break;
             }
 
             // Capture the mouse on SDL_WINDOWEVENT_ENTER if needed

app/streaming/session.h

@@ -141,6 +141,7 @@ private:
     SDL_SpinLock m_DecoderLock;
     bool m_NeedsIdr;
     bool m_AudioDisabled;
+    bool m_AudioMuted;
     Uint32 m_FullScreenFlag;
     int m_DisplayOriginX;
     int m_DisplayOriginY;