From 9d8049988d47432e31d1da2db585117bb4456c1b Mon Sep 17 00:00:00 2001
From: jorsi <jonathon.orsi@gmail.com>
Date: Fri, 9 Oct 2020 12:22:06 -0400
Subject: [PATCH] fix safari audio bug where error prevents leaving worldmap
 locations -- reveals another safari bug where decodeAudioData doesn't return
 a promise to start playing music immediately

---
 script/audio.js  | 22 ++++++++++++++++++++--
 script/engine.js | 27 +++++++++------------------
 2 files changed, 29 insertions(+), 20 deletions(-)

diff --git a/script/audio.js b/script/audio.js
index 58e5cad..819c1db 100644
--- a/script/audio.js
+++ b/script/audio.js
@@ -136,7 +136,9 @@ var AudioEngine = {
         var fadeTime = AudioEngine._audioContext.currentTime + AudioEngine.FADE_TIME * 2;
 
         // fade out event music and stop
-        if (AudioEngine._currentEventAudio) {
+        if (AudioEngine._currentEventAudio && 
+            AudioEngine._currentEventAudio.source && 
+            AudioEngine._currentEventAudio.source.buffer) {
             var currentEventGainValue = AudioEngine._currentEventAudio.envelope.gain.value;
             AudioEngine._currentEventAudio.envelope.gain.cancelScheduledValues(AudioEngine._audioContext.currentTime);
             AudioEngine._currentEventAudio.envelope.gain.setValueAtTime(currentEventGainValue, AudioEngine._audioContext.currentTime);
@@ -212,10 +214,26 @@ var AudioEngine = {
                     return AudioEngine._getMissingAudioBuffer();
                 }
 
-                return AudioEngine._audioContext.decodeAudioData(buffer, function (decodedData) {
+                var decodeAudioDataPromise = AudioEngine._audioContext.decodeAudioData(buffer, function (decodedData) {
                     AudioEngine.AUDIO_BUFFER_CACHE[src] = decodedData;
                     return AudioEngine.AUDIO_BUFFER_CACHE[src];
                 });
+
+                // Safari WebAudio does not return a promise based API for
+                // decodeAudioData, so we need to fake it if we want to play
+                // audio immediately on first fetch
+                if (decodeAudioDataPromise) {
+                    return decodeAudioDataPromise;
+                } else {
+                    return new Promise(function (resolve, reject) {
+                        var fakePromiseId = setInterval(function() {
+                            if (AudioEngine.AUDIO_BUFFER_CACHE[src]) {
+                                resolve(AudioEngine.AUDIO_BUFFER_CACHE[src]);
+                                clearInterval(fakePromiseId);
+                            }
+                        }, 20);
+                    });
+                }
             });
         }
     },
diff --git a/script/engine.js b/script/engine.js
index 8eb6c19..3b17e97 100644
--- a/script/engine.js
+++ b/script/engine.js
@@ -142,17 +142,10 @@
 				});
 			}
 
-      // Disable this for now
-			// $('<span>')
-			// 	.addClass('volume menuBtn')
-			// 	.text(_('sound on.'))
-			// 	.click(() => Engine.toggleVolume())
-			// 	.appendTo(menu);
-
 			$('<span>')
 				.addClass('volume menuBtn')
-				.text(_('sound off.'))
-				.click(Engine.toggleVolume)
+				.text(_('sound on.'))
+				.click(() => Engine.toggleVolume())
 				.appendTo(menu);
 
 			$('<span>')
@@ -222,7 +215,7 @@
 			$.Dispatch('stateUpdate').subscribe(Engine.handleStateUpdates);
 
 			$SM.init();
-			// AudioEngine.init(); Disable this for now
+			AudioEngine.init();
 			Notifications.init();
 			Events.init();
 			Room.init();
@@ -246,24 +239,22 @@
 				Engine.triggerHyperMode();
 			}
 
-      // Disable this for now
-      // Engine.toggleVolume(Boolean($SM.get('config.soundOn')));
-      // if(!AudioEngine.isAudioContextRunning()){
-      //   document.addEventListener('click', Engine.resumeAudioContext, true);
-      // }
+			Engine.toggleVolume(Boolean($SM.get('config.soundOn')));
+			if(!AudioEngine.isAudioContextRunning()){
+				document.addEventListener('click', Engine.resumeAudioContext, true);
+			}
 			
 			Engine.saveLanguage();
 			Engine.travelTo(Room);
 
-      // Disable this for now
-      // setTimeout(notifyAboutSound, 3000);
+      		setTimeout(notifyAboutSound, 3000);
 
 		},
 		resumeAudioContext: function () {
 			AudioEngine.tryResumingAudioContext();
 			
 			// turn on music!
-      AudioEngine.setMasterVolume($SM.get('config.soundOn') ? 1.0 : 0.0, 0);
+      		AudioEngine.setMasterVolume($SM.get('config.soundOn') ? 1.0 : 0.0, 0);
 
 			document.removeEventListener('click', Engine.resumeAudioContext);
 		},