From d5ecb99b16125ae9a9bb379f8c7573e54ac3ea8c Mon Sep 17 00:00:00 2001
From: Brad Hefta-Gaub <brad@highfidelity.io>
Date: Fri, 1 Apr 2016 08:57:37 -0700
Subject: [PATCH] switch to HMD preferred audio when mounting the HMD

---
 examples/selectAudioDevice.js | 70 +++++++++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 4 deletions(-)

diff --git a/examples/selectAudioDevice.js b/examples/selectAudioDevice.js
index c86d034adb..8aeacfaef1 100644
--- a/examples/selectAudioDevice.js
+++ b/examples/selectAudioDevice.js
@@ -120,27 +120,89 @@ function menuItemEvent(menuItem) {
         if (menuItem.endsWith(" for Output")) {
             var selectedDevice = menuItem.trimStartsWith("Use ").trimEndsWith(" for Output");
             print("output audio selection..." + selectedDevice);
-	    Menu.menuItemEvent.disconnect(menuItemEvent);
+	        Menu.menuItemEvent.disconnect(menuItemEvent);
             Menu.setIsOptionChecked(selectedOutputMenu, false);
             selectedOutputMenu = menuItem;
             Menu.setIsOptionChecked(selectedOutputMenu, true);
             if (AudioDevice.setOutputDevice(selectedDevice)) {
                 Settings.setValue(OUTPUT_DEVICE_SETTING, selectedDevice);
             }
-	    Menu.menuItemEvent.connect(menuItemEvent);
+	        Menu.menuItemEvent.connect(menuItemEvent);
         } else if (menuItem.endsWith(" for Input")) {
             var selectedDevice = menuItem.trimStartsWith("Use ").trimEndsWith(" for Input");
             print("input audio selection..." + selectedDevice);
-	    Menu.menuItemEvent.disconnect(menuItemEvent);
+	        Menu.menuItemEvent.disconnect(menuItemEvent);
             Menu.setIsOptionChecked(selectedInputMenu, false);
             selectedInputMenu = menuItem;
             Menu.setIsOptionChecked(selectedInputMenu, true);
             if (AudioDevice.setInputDevice(selectedDevice)) {
                 Settings.setValue(INPUT_DEVICE_SETTING, selectedDevice);
             }
-	    Menu.menuItemEvent.connect(menuItemEvent);
+	        Menu.menuItemEvent.connect(menuItemEvent);
         }
     }
 }
 
 Menu.menuItemEvent.connect(menuItemEvent);
+
+// Some HMDs (like Oculus CV1) have a built in audio device. If they
+// do, then this function will handle switching to that device automatically
+// when you goActive with the HMD active.
+var wasHmdMounted = HMD.mounted;
+var switchedAudioInputToHMD = false;
+var switchedAudioOutputToHMD = false;
+var previousSelectedInputAudioDevice = "";
+var previousSelectedOutputAudioDevice = "";
+function checkHMDAudio() {
+    // Mounted state is changing... handle switching
+    if (HMD.mounted != wasHmdMounted) {
+        print("HMD mounted changed...");
+
+        // We're putting the HMD on... switch to those devices
+        if (HMD.mounted) {
+            print("NOW mounted...");
+            var hmdPreferredAudioInput = HMD.preferredAudioInput();
+            var hmdPreferredAudioOutput = HMD.preferredAudioOutput();
+            print("hmdPreferredAudioInput:" + hmdPreferredAudioInput);
+            print("hmdPreferredAudioOutput:" + hmdPreferredAudioOutput);
+
+
+            var hmdHasPreferredAudio = (hmdPreferredAudioInput !== "") || (hmdPreferredAudioOutput !== "");
+            if (hmdHasPreferredAudio) {
+                print("HMD has preferred audio!");
+                previousSelectedInputAudioDevice = Settings.getValue(INPUT_DEVICE_SETTING);
+                previousSelectedOutputAudioDevice = Settings.getValue(OUTPUT_DEVICE_SETTING);
+                print("previousSelectedInputAudioDevice:" + previousSelectedInputAudioDevice);
+                print("previousSelectedOutputAudioDevice:" + previousSelectedOutputAudioDevice);
+                if (hmdPreferredAudioInput != previousSelectedInputAudioDevice && hmdPreferredAudioInput !== "") {
+                    print("switching to HMD preferred audio input to:" + hmdPreferredAudioInput);
+                    switchedAudioInputToHMD = true;
+                    menuItemEvent("Use " + hmdPreferredAudioInput + " for Input");
+                }
+                if (hmdPreferredAudioOutput != previousSelectedOutputAudioDevice && hmdPreferredAudioOutput !== "") {
+                    print("switching to HMD preferred audio output to:" + hmdPreferredAudioOutput);
+                    switchedAudioOutputToHMD = true;
+                    menuItemEvent("Use " + hmdPreferredAudioOutput + " for Output");
+                }
+            }
+        } else {
+            print("HMD NOW un-mounted...");
+            if (switchedAudioInputToHMD) {
+                print("switching back from HMD preferred audio input to:" + previousSelectedInputAudioDevice);
+                menuItemEvent("Use " + previousSelectedInputAudioDevice + " for Input");
+            }
+            if (switchedAudioOutputToHMD) {
+                print("switching back from HMD preferred audio output to:" + previousSelectedOutputAudioDevice);
+                menuItemEvent("Use " + previousSelectedOutputAudioDevice + " for Output");
+            }
+        }
+    }
+    wasHmdMounted = HMD.mounted;
+}
+
+Script.update.connect(checkHMDAudio);
+
+Script.scriptEnding.connect(function () {
+    Menu.menuItemEvent.disconnect(menuItemEvent);
+    Script.update.disconnect(checkHMDAudio);
+});