Add global offset

Adds new settings for controlling the note offset while playing. It can be either an actual offset (it is called "Audio Latency" in the settings) or just the visual offset ("Video Latency").
With higher audio latency it means you have to press the button sooner than what you hear, similarly with higher video latency it is sooner than what you see. By offsetting these events the game would play better, however, the sound effect of you hitting the drum would still play at the wrong time, the code cannot anticipate you to hit the drum in the future so to work around this issue a new option that disables drum sounds is also included.
These settings could be set through trial and error but it would be better to get the correct values through the automated latency calibration, where you can hit the drum as you hear sounds or see a blinking animation. I tried making one by measuring latency from user input, adding all the latency up, and dividing, but that gives unreliable results. I hope someone suggests to me what I should be doing during the calibration to get better results, as I cannot figure what to do on my own.

public/src/css/game.css

@@ -16,14 +16,6 @@
 	width: 100%;
 	height: 100%;
 }
-#cursor{
-	position: fixed;
-	width: 1px;
-	height: 1px;
-	cursor: none;
-	pointer-events: none;
-	z-index: 1;
-}
 #touch-drum{
 	display: none;
 	position: absolute;

public/src/css/view.css

@@ -158,8 +158,7 @@ kbd{
 .setting-box:first-child{
 	margin-top: 0;
 }
-.settings-outer .view-content:not(:hover) .setting-box.selected,
-.view-outer:not(.settings-outer) .setting-box.selected,
+.view-content:not(:hover) .setting-box.selected,
 .setting-box:hover{
 	background: #ffb547;
 	animation: 2s linear border-pulse infinite;
@@ -177,7 +176,6 @@ kbd{
 	overflow: hidden;
 }
 .view-content:not(:hover) .setting-box.selected .setting-name,
-.view-outer:not(.settings-outer) .setting-box.selected .setting-name,
 .setting-box:hover .setting-name,
 .setting-box:hover #gamepad-value{
 	color: #fff;
@@ -193,6 +191,8 @@ kbd{
 	border-radius: 0.2em;
 	padding: 0.5em;
 	box-sizing: border-box;
+	overflow: hidden;
+	white-space: nowrap;
 }
 .setting-value.selected{
 	width: calc(50% + 0.2em);
@@ -215,27 +215,26 @@ kbd{
 	background: rgba(0, 0, 0, 0.5);
 	z-index: 1;
 }
-#settings-gamepad{
+#settings-gamepad,
+#settings-latency{
 	display: none;
 }
 #settings-gamepad .view{
-	position: absolute;
-	margin: auto;
-	top: 0;
-	right: 0;
-	bottom: 0;
-	left: 0;
-	width: 574px;
-	height: 428px;
-	max-height: calc(100vh - 14em + 88px);
+	width: 29.9em;
+	max-width: 100vw;
 }
 #settings-gamepad .setting-box{
 	height: auto;
+	overflow: hidden;
+}
+#gamepad-bg,
+#gamepad-buttons{
+	background-size: 20.53em;
 }
 #gamepad-bg{
 	position: relative;
-	width: 550px;
-	height: 317px;
+	width: 20.53em;
+	height: 11.83em;
 	max-height: none;
 	background-repeat: no-repeat;
 	text-align: center;
@@ -244,11 +243,11 @@ kbd{
 }
 #gamepad-buttons{
 	position: absolute;
-	left: 141px;
-	top: 120px;
-	width: 282px;
-	height: 131px;
-	background-position: 0 -318px;
+	left: 5.26em;
+	top: 4.48em;
+	width: 10.52em;
+	height: 4.89em;
+	background-position: 0 -11.87em;
 	background-repeat: no-repeat;
 	pointer-events: none;
 }
@@ -259,3 +258,36 @@ kbd{
 #gamepad-value::before{
 	left: auto;
 }
+#settings-latency .view{
+	width: 30em;
+}
+#settings-latency .setting-value{
+	position: relative;
+}
+.setting-value:not(.selected) .latency-buttons{
+	display: none;
+}
+.setting-value .latency-buttons{
+	position: absolute;
+	top: 0;
+	right: 0;
+	bottom: 0;
+	padding: 0;
+}
+.latency-buttons span{
+	display: inline-block;
+	width: 2em;
+	height: 100%;
+	text-align: center;
+	background-color: #c3862a;
+	color: #fff;
+	line-height: 2em;
+	outline: none;
+}
+.latency-buttons span:hover,
+.latency-buttons span:active{
+	background-color: #946013;
+}
+.left-buttons .taibtn{
+	z-index: 1;
+}

public/src/js/about.js

@@ -29,23 +29,30 @@
 		this.endButton.innerText = strings.tutorial.ok
 		this.endButton.setAttribute("alt", strings.tutorial.ok)
 		
+		this.items = []
+		
 		var versionUrl = gameConfig._version.url
 		this.getLink(this.linkIssues).href = versionUrl + "issues"
-
+		this.items.push(this.linkIssues)
+		
 		var contactEmail = gameConfig.email
-		if (typeof contactEmail === 'string') {
+		this.hasEmail = typeof contactEmail === "string"
+		if(this.hasEmail){
 			this.linkEmail.setAttribute("alt", contactEmail)
 			this.getLink(this.linkEmail).href = "mailto:" + contactEmail
-			this.getLink(this.linkEmail).text = contactEmail
-		} else {
-			this.linkEmail.style.display = "none"
+			this.getLink(this.linkEmail).innerText = contactEmail
+			this.items.push(this.linkEmail)
+		}else{
+			this.linkEmail.parentNode.removeChild(this.linkEmail)
 		}
-
+		
 		pageEvents.add(this.linkIssues, ["click", "touchend"], this.linkButton.bind(this))
-		pageEvents.add(this.linkEmail, ["click", "touchend"], this.linkButton.bind(this))
+		if(this.hasEmail){
+			pageEvents.add(this.linkEmail, ["click", "touchend"], this.linkButton.bind(this))
+		}
 		pageEvents.add(this.endButton, ["mousedown", "touchstart"], this.onEnd.bind(this))
-		this.items = [this.linkIssues, this.linkEmail, this.endButton]
-		this.selected = 2
+		this.items.push(this.endButton)
+		this.selected = this.items.length - 1
 		
 		this.keyboard = new Keyboard({
 			confirm: ["enter", "space", "don_l", "don_r"],
@@ -146,6 +153,8 @@
 			}
 		}
 		diag.push("Language: " + strings.id + userLangStr)
+		var latency = settings.getItem("latency")
+		diag.push("Audio Latency: " + (latency.audio > 0 ? "+" : "") + latency.audio.toString() + "ms, Video Latency: " + (latency.video > 0 ? "+" : "") + latency.video.toString() + "ms")
 		var errorObj = {}
 		if(localStorage["lastError"]){
 			try{
@@ -195,7 +204,9 @@
 		}
 		
 		var issueBody = strings.about.issueTemplate + "\n\n\n\n" + diag
-		this.getLink(this.linkEmail).href += "?body=" + encodeURIComponent(issueBody.replace(/\n/g, "<br>\r\n"))
+		if(this.hasEmail){
+			this.getLink(this.linkEmail).href += "?body=" + encodeURIComponent(issueBody.replace(/\n/g, "<br>\r\n"))
+		}
 		
 		return diag
 	}
@@ -214,7 +225,9 @@
 		this.keyboard.clean()
 		this.gamepad.clean()
 		pageEvents.remove(this.linkIssues, ["click", "touchend"])
-		pageEvents.remove(this.linkEmail, ["click", "touchend"])
+		if(this.hasEmail){
+			pageEvents.remove(this.linkEmail, ["click", "touchend"])
+		}
 		pageEvents.remove(this.endButton, ["mousedown", "touchstart"])
 		if(this.textarea){
 			pageEvents.remove(this.textarea, ["focus", "blur"])

public/src/js/assets.js

@@ -114,7 +114,8 @@ var assets = {
 		"v_sanka.wav",
 		"v_songsel.wav",
 		"v_start.wav",
-		"v_title.wav"
+		"v_title.wav",
+		"calibration.wav"
 	],
 	"audioSfxLR": [
 		"neiro_1_don.wav",

public/src/js/canvascache.js

@@ -1,5 +1,6 @@
 class CanvasCache{
-	constructor(w, h, scale){
+	constructor(noSmoothing, w, h, scale){
+		this.noSmoothing = noSmoothing
 		if(w){
 			this.resize(w, h, scale)
 		}
@@ -11,6 +12,9 @@ class CanvasCache{
 			this.map = new Map()
 			this.canvas = document.createElement("canvas")
 			this.ctx = this.canvas.getContext("2d")
+			if(this.noSmoothing){
+				this.ctx.imageSmoothingEnabled = false
+			}
 		}
 		this.scale = scale
 		this.x = 0

public/src/js/canvasdraw.js

@@ -1,5 +1,5 @@
 class CanvasDraw{
-	constructor(){
+	constructor(noSmoothing){
 		this.diffStarPath = new Path2D(vectors.diffStar)
 		this.longVowelMark = new Path2D(vectors.longVowelMark)
 		
@@ -68,7 +68,8 @@
 			emCap: /[MWＭＷ]/,
 			rWidth: /[abdfIjo-rtvａｂｄｆＩｊｏ-ｒｔｖ]/,
 			lWidth: /[ilｉｌ]/,
-			ura: /\s*[\(（]裏[\)）]$/
+			ura: /\s*[\(（]裏[\)）]$/,
+			cjk: /[\u3040-ゞ゠-ヾ一-\u9ffe]/
 		}
 		
 		var numbersFull = "０１２３４５６７８９"
@@ -78,10 +79,12 @@
 			this.numbersFullToHalf[numbersFull[i]] = numbersHalf[i]
 			this.numbersFullToHalf[numbersHalf[i]] = numbersHalf[i]
 		}
+		this.wrapOn = [" ", "\n", "%s"]
+		this.stickySymbols = "!,.:;?~‐–‼、。々〜ぁぃぅぇぉっゃゅょァィゥェォッャュョ・ーヽヾ！：；？"
 		
-		this.songFrameCache = new CanvasCache()
-		this.diffStarCache = new CanvasCache()
-		this.crownCache = new CanvasCache()
+		this.songFrameCache = new CanvasCache(noSmoothing)
+		this.diffStarCache = new CanvasCache(noSmoothing)
+		this.crownCache = new CanvasCache(noSmoothing)
 		
 		this.tmpCanvas = document.createElement("canvas")
 		this.tmpCtx = this.tmpCanvas.getContext("2d")
@@ -818,6 +821,163 @@
 		ctx.restore()
 	}
 	
+	wrappingText(config){
+		var ctx = config.ctx
+		var inputText = config.text.toString()
+		var words = []
+		var start = 0
+		var substituteIndex = 0
+		while(start < inputText.length){
+			var character = inputText.slice(start, start + 1)
+			if(words.length !== 0){
+				var previous = words[words.length - 1]
+				if(!previous.substitute && previous !== "\n" && this.stickySymbols.indexOf(character) !== -1){
+					words[words.length - 1] += character
+					start++
+					continue
+				}
+			}
+			var index = Infinity
+			var currentIndex = inputText.slice(start).search(this.regex.cjk)
+			if(currentIndex !== -1){
+				index = start + currentIndex
+				var on = inputText.charAt(index)
+			}
+			for(var i = 0; i < this.wrapOn.length; i++){
+				var currentIndex = inputText.indexOf(this.wrapOn[i], start)
+				if(currentIndex !== -1 && currentIndex < index){
+					var on = this.wrapOn[i]
+					index = currentIndex
+				}
+			}
+			if(index === Infinity){
+				if(start !== inputText.length){
+					words.push(inputText.slice(start, inputText.length))
+				}
+				break
+			}
+			var end = index + (on === " " ? 1 : 0)
+			if(start !== end){
+				words.push(inputText.slice(start, end))
+			}
+			if(on === "%s" && config.substitute){
+				words.push({
+					substitute: true,
+					index: substituteIndex,
+					width: config.substitute(config, substituteIndex, true) || 0
+				})
+				substituteIndex++
+			}else if(on !== " "){
+				words.push(on)
+			}
+			start = index + on.length
+		}
+		
+		ctx.save()
+		
+		var bold = this.bold(config.fontFamily)
+		ctx.font = bold + config.fontSize + "px " + config.fontFamily
+		ctx.textBaseline = config.baseline || "top"
+		ctx.textAlign = "left"
+		ctx.fillStyle = config.fill
+		var lineHeight = config.lineHeight || config.fontSize
+		
+		var x = 0
+		var y = 0
+		var totalW = 0
+		var totalH = 0
+		var line = ""
+		var toDraw = []
+		var lastWidth = 0
+		
+		var addToDraw = obj => {
+			toDraw.push(obj)
+			if(x + lastWidth > totalW){
+				totalW = x + lastWidth
+			}
+			if(y + lineHeight > totalH){
+				totalH = y + lineHeight
+			}
+		}
+		var recenter = () => {
+			if(config.textAlign === "center"){
+				for(var j in toDraw){
+					if(toDraw[j].y === y){
+						toDraw[j].x += (config.width - x - lastWidth) / 2
+					}
+				}
+			}
+		}
+		
+		for(var i in words){
+			var skip = words[i].substitute || words[i] === "\n"
+			if(!skip){
+				var currentWidth = ctx.measureText(line + words[i]).width
+			}
+			if(skip || (x !== 0 || line) && x + currentWidth > config.width){
+				if(line){
+					addToDraw({
+						text: line,
+						x: x, y: y
+					})
+				}
+				if(words[i].substitute){
+					line = ""
+					var currentWidth = words[i].width
+					if(x + lastWidth + currentWidth > config.width){
+						recenter()
+						x = 0
+						y += lineHeight
+						lastWidth = 0
+					}
+					addToDraw({
+						substitute: true,
+						index: words[i].index,
+						x: x + lastWidth, y: y
+					})
+					x += lastWidth + currentWidth
+					lastWidth = currentWidth
+				}else{
+					recenter()
+					x = 0
+					y += lineHeight
+					line = words[i] === "\n" ? "" : words[i]
+					lastWidth = ctx.measureText(line).width
+				}
+			}else{
+				line += words[i]
+				lastWidth = currentWidth
+			}
+		}
+		if(line){
+			addToDraw({
+				text: line,
+				x: x, y: y
+			})
+			recenter()
+		}
+		
+		var addX = 0
+		var addY = 0
+		if(config.verticalAlign === "middle"){
+			addY = ((config.height || 0) - totalH) / 2
+		}
+		for(var i in toDraw){
+			var x = config.x + toDraw[i].x + addX
+			var y = config.y + toDraw[i].y + addY
+			if(toDraw[i].text){
+				ctx.fillText(toDraw[i].text, x, y)
+			}else if(toDraw[i].substitute){
+				ctx.save()
+				ctx.translate(x, y)
+				config.substitute(config, toDraw[i].index)
+				ctx.restore()
+			}
+		}
+		
+		ctx.restore()
+	}
+	
 	diffIcon(config){
 		var ctx = config.ctx
 		var scale = config.scale

public/src/js/controller.js

@@ -7,6 +7,16 @@ class Controller{
 		this.touchEnabled = touchEnabled
 		this.snd = this.multiplayer ? "_p" + this.multiplayer : ""
 		
+		this.calibrationMode = selectedSong.folder === "calibration"
+		this.audioLatency = 0
+		this.videoLatency = 0
+		if(!this.calibrationMode){
+			var latency = settings.getItem("latency")
+			if(!autoPlayEnabled){
+				this.audioLatency = Math.round(latency.audio) || 0
+			}
+			this.videoLatency = Math.round(latency.video) || 0 + this.audioLatency
+		}
 		if(this.multiplayer !== 2){
 			loader.changePage("game", false)
 		}
@@ -18,18 +28,23 @@ class Controller{
 		}
 		this.offset = this.parsedSongData.soundOffset
 		
-		assets.songs.forEach(song => {
-			if(song.id == this.selectedSong.folder){
-				this.mainAsset = song.sound
-				this.volume = song.volume || 1
-			}
-		})
+		if(this.calibrationMode){
+			this.volume = 1
+		}else{
+			assets.songs.forEach(song => {
+				if(song.id == this.selectedSong.folder){
+					this.mainAsset = song.sound
+					this.volume = song.volume || 1
+				}
+			})
+		}
 		
 		this.game = new Game(this, this.selectedSong, this.parsedSongData)
 		this.view = new View(this)
 		this.mekadon = new Mekadon(this, this.game)
 		this.keyboard = new GameInput(this)
 		
+		this.drumSounds = settings.getItem("latency").drumSounds
 		this.playedSounds = {}
 	}
 	run(syncWith){
@@ -72,8 +87,8 @@ class Controller{
 	}
 	stopMainLoop(){
 		this.mainLoopRunning = false
-		if(this.mainAsset){
-			this.mainAsset.stop()
+		if(this.game.mainAsset){
+			this.game.mainAsset.stop()
 		}
 		if(this.multiplayer !== 2){
 			clearInterval(this.gameInterval)
@@ -90,13 +105,18 @@ class Controller{
 			if(this.game.musicFadeOut < 3){
 				this.keyboard.checkMenuKeys()
 			}
+			if(this.calibrationMode){
+				this.game.calibration()
+			}
 			if(!this.game.isPaused()){
 				this.keyboard.checkGameKeys()
 				
 				if(ms < 0){
 					this.game.updateTime()
 				}else{
-					this.game.update()
+					if(!this.calibrationMode){
+						this.game.update()
+					}
 					if(!this.mainLoopRunning){
 						return
 					}
@@ -158,7 +178,11 @@ class Controller{
 		if(!fadeIn){
 			this.clean()
 		}
-		new SongSelect(false, fadeIn, this.touchEnabled)
+		if(this.calibrationMode){
+			new SettingsView(this.touchEnabled, false, null, "latency")
+		}else{
+			new SongSelect(false, fadeIn, this.touchEnabled)
+		}
 	}
 	restartSong(){
 		this.clean()
@@ -166,20 +190,24 @@ class Controller{
 			new LoadSong(this.selectedSong, false, true, this.touchEnabled)
 		}else{
 			new Promise(resolve => {
-				var songObj = assets.songs.find(song => song.id === this.selectedSong.folder)
-				if(songObj.chart){
-					var reader = new FileReader()
-					var promise = pageEvents.load(reader).then(event => {
-						this.songData = event.target.result.replace(/\0/g, "").split("\n")
-						resolve()
-					})
-					if(this.selectedSong.type === "tja"){
-						reader.readAsText(songObj.chart, "sjis")
-					}else{
-						reader.readAsText(songObj.chart)
-					}
-				}else{
+				if(this.calibrationMode){
 					resolve()
+				}else{
+					var songObj = assets.songs.find(song => song.id === this.selectedSong.folder)
+					if(songObj.chart && songObj.chart !== "blank"){
+						var reader = new FileReader()
+						var promise = pageEvents.load(reader).then(event => {
+							this.songData = event.target.result.replace(/\0/g, "").split("\n")
+							resolve()
+						})
+						if(this.selectedSong.type === "tja"){
+							reader.readAsText(songObj.chart, "sjis")
+						}else{
+							reader.readAsText(songObj.chart)
+						}
+					}else{
+						resolve()
+					}
 				}
 			}).then(() => {
 				var taikoGame = new Controller(this.selectedSong, this.songData, this.autoPlayEnabled, false, this.touchEnabled)
@@ -187,10 +215,13 @@ class Controller{
 			})
 		}
 	}
-	playSound(id, time){
+	playSound(id, time, noSnd){
+		if(!this.drumSounds && (id === "neiro_1_don" || id === "neiro_1_ka" || id === "se_don" || id === "se_ka")){
+			return
+		}
 		var ms = Date.now() + (time || 0) * 1000
 		if(!(id in this.playedSounds) || ms > this.playedSounds[id] + 30){
-			assets.sounds[id + this.snd].play(time)
+			assets.sounds[id + (noSnd ? "" : this.snd)].play(time)
 			this.playedSounds[id] = ms
 		}
 	}
@@ -201,11 +232,11 @@ class Controller{
 		}
 		this.playSound(soundID + meka, time)
 	}
-	togglePause(){
+	togglePause(forcePause, pauseMove, noSound){
 		if(this.multiplayer === 1){
-			this.syncWith.game.togglePause()
+			this.syncWith.game.togglePause(forcePause, pauseMove, noSound)
 		}
-		this.game.togglePause()
+		this.game.togglePause(forcePause, pauseMove, noSound)
 	}
 	getKeys(){
 		return this.keyboard.getKeys()

public/src/js/game.js

@@ -45,7 +45,12 @@ class Game{
 	}
 	initTiming(){
 		// Date when the chrono is started (before the game begins)
-		var offsetTime = Math.max(0, this.timeForDistanceCircle - this.songData.circles[0].ms) |0
+		var firstCircle = this.songData.circles[0]
+		if(this.controller.calibrationMode){
+			var offsetTime = 0
+		}else{
+			var offsetTime = Math.max(0, this.timeForDistanceCircle - (firstCircle ? firstCircle.ms : 0)) |0
+		}
 		if(this.controller.multiplayer){
 			var syncWith = this.controller.syncWith
 			var syncCircles = syncWith.game.songData.circles
@@ -57,8 +62,8 @@ class Game{
 		this.startDate = Date.now() + offsetTime
 	}
 	update(){
-		// Main operations
 		this.updateTime()
+		// Main operations
 		this.updateCirclesStatus()
 		this.checkPlays()
 		// Event operations
@@ -82,10 +87,10 @@ class Game{
 			if(circle && (!circle.branch || circle.branch.active) && !circle.isPlayed){
 				var type = circle.type
 				var drumrollNotes = type === "balloon" || type === "drumroll" || type === "daiDrumroll"
-				var endTime = circle.endTime + (drumrollNotes ? 0 : this.rules.bad)
+				var endTime = circle.endTime + (drumrollNotes ? 0 : this.rules.bad) + this.controller.audioLatency
 				
-				if(ms >= circle.ms){
-					if(drumrollNotes && !circle.rendaPlayed && ms < endTime){
+				if(ms >= circle.ms + this.controller.audioLatency){
+					if(drumrollNotes && !circle.rendaPlayed && ms < endTime + this.controller.audioLatency){
 						circle.rendaPlayed = true
 						if(this.rules.difficulty === "easy"){
 							assets.sounds["v_renda" + this.controller.snd].stop()
@@ -109,7 +114,7 @@ class Game{
 							this.updateCurrentCircle()
 							if(this.controller.multiplayer === 1){
 								var value = {
-									pace: (ms - circle.ms) / circle.timesHit
+									pace: (ms - circle.ms - this.controller.audioLatency) / circle.timesHit
 								}
 								if(type === "drumroll" || type === "daiDrumroll"){
 									value.kaAmount = circle.timesKa / circle.timesHit
@@ -211,7 +216,7 @@ class Game{
 		
 		for(var i = this.currentCircle + 1; i < circles.length; i++){
 			var circle = circles[i]
-			var relative = ms - circle.ms
+			var relative = ms - circle.ms - this.controller.audioLatency
 			if(!circle.branch || circle.branch.active){
 				if((!circleIsNote(circle) || relative < -this.rules.bad)){
 					break
@@ -310,7 +315,7 @@ class Game{
 		
 		var keyTime = this.controller.getKeyTime()
 		var currentTime = keysDon ? keyTime["don"] : keyTime["ka"]
-		var relative = currentTime - circle.ms
+		var relative = currentTime - circle.ms - this.controller.audioLatency
 		
 		if(relative >= this.rules.ok){
 			var fixedNote = this.fixNoteStream(keysDon)
@@ -366,7 +371,7 @@ class Game{
 			if(this.controller.multiplayer === 1){
 				var value = {
 					score: score,
-					ms: circle.ms - currentTime,
+					ms: circle.ms - currentTime - this.controller.audioLatency,
 					dai: typeDai ? (keyDai ? 2 : 1) : 0
 				}
 				if((!keysDon || !typeDon) && (!keysKa || !typeKa)){
@@ -375,7 +380,7 @@ class Game{
 				p2.send("note", value)
 			}
 		}else{
-			if(circle.ms > currentTime || currentTime > circle.endTime){
+			if(circle.ms + this.controller.audioLatency > currentTime || currentTime > circle.endTime + this.controller.audioLatency){
 				return true
 			}
 			if(keysDon && type === "balloon"){
@@ -400,7 +405,7 @@ class Game{
 			circle.played(score)
 			if(this.controller.multiplayer == 1){
 				p2.send("drumroll", {
-					pace: (this.elapsedTime - circle.ms) / circle.timesHit
+					pace: (this.elapsedTime - circle.ms + this.controller.audioLatency) / circle.timesHit
 				})
 			}
 		}else{
@@ -447,17 +452,19 @@ class Game{
 		var ms = this.elapsedTime
 		if(!this.lastCircle){
 			var circles = this.songData.circles
-			this.lastCircle = circles[circles.length - 1].endTime
+			var circle = circles[circles.length - 1]
+			this.lastCircle = circle ? circle.endTime : 0
 			if(this.controller.multiplayer){
 				var syncWith = this.controller.syncWith
 				var syncCircles = syncWith.game.songData.circles
-				var syncLastCircle = syncCircles[syncCircles.length - 1].endTime
+				circle = syncCircles[syncCircles.length - 1]
+				var syncLastCircle = circle ? circle.endTime : 0
 				if(syncLastCircle > this.lastCircle){
 					this.lastCircle = syncLastCircle
 				}
 			}
 		}
-		if(!this.fadeOutStarted && ms >= this.lastCircle + 2000){
+		if(!this.fadeOutStarted && ms >= this.lastCircle + 2000 + this.controller.audioLatency){
 			this.fadeOutStarted = ms
 			if(this.controller.multiplayer){
 				this.controller.syncWith.game.fadeOutStarted = ms
@@ -495,28 +502,51 @@ class Game{
 	playMainMusic(){
 		var ms = this.elapsedTime + this.controller.offset
 		if(!this.mainMusicPlaying && (!this.fadeOutStarted || ms < this.fadeOutStarted + 1600)){
-			if(this.controller.multiplayer !== 2 && this.mainAsset){
+			if(this.calibrationState === "audio"){
+				var beatInterval = this.controller.view.beatInterval
+				var startAt = ms % beatInterval
+				var duration = this.mainAsset.duration * 1000
+				if(startAt < duration){
+					this.mainAsset.playLoop(0, false, startAt / 1000, 0, beatInterval / 1000)
+				}else{
+					this.mainAsset.playLoop((startAt - duration) / 1000, false, 0, 0, beatInterval / 1000)
+				}
+			}else if(this.controller.multiplayer !== 2 && this.mainAsset){
 				this.mainAsset.play((ms < 0 ? -ms : 0) / 1000, false, Math.max(0, ms / 1000))
 			}
 			this.mainMusicPlaying = true
 		}
 	}
-	togglePause(){
+	togglePause(forcePause, pauseMove, noSound){
 		if(!this.paused){
-			assets.sounds["se_pause"].play()
+			if(forcePause === false){
+				return
+			}
+			if(!noSound){
+				this.controller.playSound("se_pause", 0, true)
+			}
 			this.paused = true
 			this.latestDate = Date.now()
 			if(this.mainAsset){
 				this.mainAsset.stop()
 			}
 			this.mainMusicPlaying = false
-			this.view.pauseMove(0, true)
+			this.view.pauseMove(pauseMove || 0, true)
 			this.view.gameDiv.classList.add("game-paused")
 			this.view.lastMousemove = this.view.getMS()
 			this.view.cursorHidden = false
 			pageEvents.send("pause")
-		}else{
-			assets.sounds["se_cancel"].play()
+		}else if(!forcePause){
+			if(forcePause !== false && this.calibrationState && ["audioHelp", "audioComplete", "videoHelp", "videoComplete", "results"].indexOf(this.calibrationState) !== -1){
+				return
+			}
+			if(this.calibrationState === "audioHelp" || this.calibrationState === "videoHelp"){
+				this.calibrationState = this.calibrationState === "audioHelp" ? "audio" : "video"
+				this.controller.view.pauseOptions = strings.pauseOptions
+				this.controller.playSound("se_don", 0, true)
+			}else if(!noSound){
+				this.controller.playSound("se_cancel", 0, true)
+			}
 			this.paused = false
 			var currentDate = Date.now()
 			this.startDate += currentDate - this.latestDate
@@ -683,7 +713,7 @@ class Game{
 		if(!circle || circle.branch === currentBranch[pastActive]){
 			var ms = this.elapsedTime
 			var closestCircle = circles.findIndex(circle => {
-				return (!circle.branch || circle.branch.active) && circle.endTime >= ms
+				return (!circle.branch || circle.branch.active) && circle.endTime + this.controller.audioLatency >= ms
 			})
 			if(closestCircle !== -1){
 				this.currentCircle = closestCircle
@@ -701,4 +731,104 @@ class Game{
 		this.sectionNotes = []
 		this.sectionDrumroll = 0
 	}
+	clearKeyTime(){
+		var keyboard = this.controller.keyboard
+		for(var key in keyboard.keyTime){
+			keyboard.keys[key] = null
+			keyboard.keyTime[key] = -Infinity
+		}
+	}
+	calibration(){
+		var view = this.controller.view
+		if(!this.calibrationState){
+			this.controller.parsedSongData.measures = []
+			this.calibrationProgress = {
+				audio: 0,
+				video: 0,
+				requirement: 40
+			}
+			this.calibrationReset("audio", true)
+		}
+		var progress = this.calibrationProgress
+		var state = this.calibrationState
+		switch(state){
+			case "audio":
+			case "video":
+				if(state === "audio" && !this.mainAsset){
+					this.mainAsset = assets.sounds["calibration"]
+					this.mainMusicPlaying = false
+				}
+				if(progress.hit >= progress.requirement){
+					var reduced = 0
+					for(var i = 2; i < progress.offsets.length; i++){
+						reduced += progress.offsets[i]
+					}
+					progress[state] = Math.max(0, Math.round(reduced / progress.offsets.length - 2))
+					this.calibrationState += "Complete"
+					view.pauseOptions = []
+					this.clearKeyTime()
+					this.togglePause(true, 1)
+					this.mainAsset = null
+				}
+				break
+			case "audioComplete":
+			case "videoComplete":
+				if(Date.now() - this.latestDate > 3000){
+					var audioComplete = this.calibrationState === "audioComplete"
+					this.controller.playSound("se_pause", 0, true)
+					if(audioComplete){
+						this.calibrationReset("video")
+					}else{
+						view.pauseOptions = [
+							strings.calibration.retryPrevious,
+							strings.calibration.finish
+						]
+					}
+					this.calibrationState = audioComplete ? "videoHelp" : "results"
+				}
+				break
+		}
+	}
+	calibrationHit(ms){
+		var progress = this.calibrationProgress
+		var beatInterval = this.controller.view.beatInterval
+		var current = Math.floor((ms + 100) / beatInterval)
+		if(current !== progress.last){
+			var offset = ((ms + 100) % beatInterval) - 100
+			var offsets = progress.offsets
+			if(offsets.length >= progress.requirement){
+				offsets.shift()
+			}
+			offsets.push(offset)
+			progress.hit++
+			progress.last = current
+			this.globalScore.gauge = 100 / (progress.requirement / progress.hit)
+		}
+	}
+	calibrationReset(to, togglePause){
+		var view = this.controller.view
+		this.songData.circles = []
+		view.pauseOptions = [
+			to === "audio" ? strings.calibration.back : strings.calibration.retryPrevious,
+			strings.calibration.start
+		]
+		this.calibrationState = to + "Help"
+		var progress = this.calibrationProgress
+		progress.offsets = []
+		progress.hit = 0
+		progress.last = null
+		this.globalScore.gauge = 0
+		if(to === "video"){
+			this.clearKeyTime()
+			this.initTiming()
+			this.latestDate = this.startDate
+			this.elapsedTime = 0
+			view.ms = 0
+		}
+		if(togglePause){
+			this.togglePause(true, 1, true)
+		}else{
+			view.pauseMove(1, true)
+		}
+	}
 }

public/src/js/gameinput.js

@@ -94,7 +94,7 @@ class GameInput{
 		}
 	}
 	checkMenuKeys(){
-		if(!this.controller.multiplayer && !this.locked){
+		if(!this.controller.multiplayer && !this.locked && this.controller.view.pauseOptions.length !== 0){
 			var moveMenu = 0
 			var ms = this.game.getAccurateTime()
 			this.gamepadMenu.play((pressed, name) => {
@@ -146,7 +146,7 @@ class GameInput{
 			this.checkKey("don_l", "menu", moveMenuConfirm)
 			this.checkKey("don_r", "menu", moveMenuConfirm)
 			if(moveMenu && this.game.isPaused()){
-				assets.sounds["se_ka"].play()
+				this.controller.playSound("se_ka", 0, true)
 				this.controller.view.pauseMove(moveMenu)
 			}
 		}
@@ -197,11 +197,19 @@ class GameInput{
 				return
 			}
 			this.keyTime[name] = ms
+			var calibrationState = this.game.calibrationState
+			var calibration = calibrationState && !this.game.paused
 			if(name == "don_l" || name == "don_r"){
-				this.checkKeySound(name, "don")
+				if(calibration){
+					this.game.calibrationHit(ms)
+				}else{
+					this.checkKeySound(name, "don")
+				}
 				this.keyboardEvents++
 			}else if(name == "ka_l" || name == "ka_r"){
-				this.checkKeySound(name, "ka")
+				if(!calibration){
+					this.checkKeySound(name, "ka")
+				}
 				this.keyboardEvents++
 			}
 		}else{

public/src/js/loadsong.js

@@ -35,14 +35,20 @@ class LoadSong{
 		var song = this.selectedSong
 		var id = song.folder
 		var promises = []
-		assets.sounds["v_start"].play()
+		if(song.folder !== "calibration"){
+			assets.sounds["v_start"].play()
+			var songObj = assets.songs.find(song => song.id === id)
+		}else{
+			var songObj = {
+				"music": "muted",
+				"chart": "blank"
+			}
+		}
 		
 		song.songBg = this.randInt(1, 5)
 		song.songStage = this.randInt(1, 3)
 		song.donBg = this.randInt(1, 6)
 		
-		var songObj = assets.songs.find(song => song.id === id)
-		
 		if(song.songSkin && song.songSkin.name){
 			var imgLoad = []
 			for(var type in song.songSkin){
@@ -117,14 +123,18 @@ class LoadSong{
 			}
 		}))
 		if(songObj.chart){
-			var reader = new FileReader()
-			promises.push(pageEvents.load(reader).then(event => {
-				this.songData = event.target.result.replace(/\0/g, "").split("\n")
-			}))
-			if(song.type === "tja"){
-				reader.readAsText(songObj.chart, "sjis")
+			if(songObj.chart === "blank"){
+				this.songData = ""
 			}else{
-				reader.readAsText(songObj.chart)
+				var reader = new FileReader()
+				promises.push(pageEvents.load(reader).then(event => {
+					this.songData = event.target.result.replace(/\0/g, "").split("\n")
+				}))
+				if(song.type === "tja"){
+					reader.readAsText(songObj.chart, "sjis")
+				}else{
+					reader.readAsText(songObj.chart)
+				}
 			}
 		}else{
 			promises.push(loader.ajax(this.getSongPath(song)).then(data => {

public/src/js/parsetja.js

@@ -122,7 +122,7 @@
 		return [string.slice(0, index), string.slice(index + delimiter.length)]
 	}
 	parseCircles(){
-		var meta = this.metadata[this.difficulty]
+		var meta = this.metadata[this.difficulty] || {}
 		var ms = (meta.offset || 0) * -1000 + this.offset
 		var bpm = Math.abs(meta.bpm) || 120
 		var scroll = 1

public/src/js/scoresheet.js

@@ -10,6 +10,14 @@ class Scoresheet{
 		
 		this.canvas = document.getElementById("canvas")
 		this.ctx = this.canvas.getContext("2d")
+		var resolution = settings.getItem("resolution")
+		var noSmoothing = resolution === "low" || resolution === "lowest"
+		if(noSmoothing){
+			this.ctx.imageSmoothingEnabled = false
+		}
+		if(resolution === "lowest"){
+			this.canvas.style.imageRendering = "pixelated"
+		}
 		this.game = document.getElementById("game")
 		
 		this.fadeScreen = document.createElement("div")
@@ -28,8 +36,8 @@ class Scoresheet{
 		this.frame = 1000 / 60
 		this.numbers = "001122334455667788900112233445".split("")
 		
-		this.draw = new CanvasDraw()
-		this.canvasCache = new CanvasCache()
+		this.draw = new CanvasDraw(noSmoothing)
+		this.canvasCache = new CanvasCache(noSmoothing)
 		
 		this.keyboard = new Keyboard({
 			confirm: ["enter", "space", "esc", "don_l", "don_r"]
@@ -105,7 +113,7 @@ class Scoresheet{
 		if(!p2.session){
 			this.state.screen = "scoresShown"
 			this.state.screenMS = this.getMS()
-			assets.sounds["neiro_1_don"].play()
+			this.controller.playSound("neiro_1_don", 0, true)
 		}
 	}
 	toSongsel(fromP2){
@@ -114,7 +122,7 @@ class Scoresheet{
 			this.state.screen = "fadeOut"
 			this.state.screenMS = this.getMS()
 			if(!fromP2){
-				assets.sounds["neiro_1_don"].play()
+				this.controller.playSound("neiro_1_don", 0, true)
 			}
 		}
 	}

public/src/js/settings.js

@@ -2,11 +2,15 @@ class Settings{
 	constructor(){
 		var ios = /iPhone|iPad/.test(navigator.userAgent)
 		var phone = /Android|iPhone|iPad/.test(navigator.userAgent)
+		this.allLanguages = []
+		for(var i in allStrings){
+			this.allLanguages.push(i)
+		}
 		
 		this.items = {
 			language: {
 				type: "language",
-				options: ["ja", "en", "cn", "tw", "ko"],
+				options: this.allLanguages,
 				default: this.getLang()
 			},
 			resolution: {
@@ -34,6 +38,14 @@ class Settings{
 				options: ["a", "b", "c"],
 				default: "a",
 				gamepad: true
+			},
+			latency: {
+				type: "latency",
+				default: {
+					"audio": 0,
+					"video": 0,
+					"drumSounds": true
+				}
 			}
 		}
 		
@@ -61,6 +73,22 @@ class Settings{
 							}
 						}
 						this.storage[i] = obj
+					}else if(current.type === "latency"){
+						var obj = {}
+						for(var j in current.default){
+							if(storage[i] && j in storage[i]){
+								if(j === "drumSounds"){
+									obj[j] = !!storage[i][j]
+									continue
+								}else if(!isNaN(storage[i][j])){
+									obj[j] = Math.round(parseFloat(storage[i][j]) || 0)
+									continue
+								}
+							}
+							obj = null
+							break
+						}
+						this.storage[i] = obj
 					}else{
 						this.storage[i] = storage[i]
 					}
@@ -107,7 +135,7 @@ class Settings{
 				}
 			}
 		}
-		return "ja"
+		return this.allLanguages[0]
 	}
 	setLang(lang, noEvent){
 		strings = lang
@@ -122,7 +150,7 @@ class Settings{
 }
 
 class SettingsView{
-	constructor(touchEnabled, tutorial, songId){
+	constructor(touchEnabled, tutorial, songId, toSetting){
 		this.touchEnabled = touchEnabled
 		this.tutorial = tutorial
 		this.songId = songId
@@ -130,9 +158,15 @@ class SettingsView{
 		loader.changePage("settings", tutorial)
 		assets.sounds["bgm_settings"].playLoop(0.1, false, 0, 1.392, 26.992)
 		this.defaultButton = document.getElementById("settings-default")
+		this.viewOuter = this.getElement("view-outer")
 		if(touchEnabled){
-			this.getElement("view-outer").classList.add("touch-enabled")
+			this.viewOuter.classList.add("touch-enabled")
 		}
+		this.touchEnd = []
+		pageEvents.add(this.viewOuter, ["mouseup", "touchend"], event => {
+			this.touchEnd.forEach(func => func(event))
+		})
+		
 		var gamepadEnabled = false
 		if("getGamepads" in navigator){
 			var gamepads = navigator.getGamepads()
@@ -145,19 +179,22 @@ class SettingsView{
 		}
 		this.mode = "settings"
 		
+		this.pressedKeys = {}
 		this.keyboard = new Keyboard({
 			"confirm": ["enter", "space", "don_l", "don_r"],
 			"up": ["up"],
-			"previous": ["left", "ka_l"],
-			"next": ["right", "down", "ka_r"],
+			"right": ["right", "ka_r"],
+			"down": ["down"],
+			"left": ["left", "ka_l"],
 			"back": ["esc"],
 			"other": ["wildcard"]
 		}, this.keyPressed.bind(this))
 		this.gamepad = new Gamepad({
 			"confirm": ["b", "ls", "rs"],
 			"up": ["u", "lsu"],
-			"previous": ["l", "lb", "lt", "lsl"],
-			"next": ["d", "r", "rb", "rt", "lsd", "lsr"],
+			"right": ["r", "rb", "rt", "lsr"],
+			"down": ["d", "lsd"],
+			"left": ["l", "lb", "lt", "lsl"],
 			"back": ["start", "a"]
 		}, this.keyPressed.bind(this))
 		
@@ -182,15 +219,15 @@ class SettingsView{
 			var nameDiv = document.createElement("div")
 			nameDiv.classList.add("setting-name", "stroke-sub")
 			var name = strings.settings[i].name
-			nameDiv.innerText = name
-			nameDiv.setAttribute("alt", name)
+			this.setAltText(nameDiv, name)
 			settingBox.appendChild(nameDiv)
 			var valueDiv = document.createElement("div")
 			valueDiv.classList.add("setting-value")
 			this.getValue(i, valueDiv)
 			settingBox.appendChild(valueDiv)
 			content.appendChild(settingBox)
-			if(this.items.length === this.selected){
+			if(!toSetting && this.items.length === this.selected || toSetting === i){
+				this.selected = this.items.length
 				settingBox.classList.add("selected")
 			}
 			this.addTouch(settingBox, event => this.setValue(i))
@@ -226,8 +263,99 @@ class SettingsView{
 		this.gamepadButtons = document.getElementById("gamepad-buttons")
 		this.gamepadValue = document.getElementById("gamepad-value")
 		
+		this.latencySettings = document.getElementById("settings-latency")
+		this.addTouch(this.latencySettings, event => {
+			if(event.target === event.currentTarget){
+				this.latencyBack()
+			}
+		})
+		this.latencyTitle = this.latencySettings.getElementsByClassName("view-title")[0]
+		this.latencyItems = []
+		this.latencySelected = 0
+		var latencyContent = this.latencySettings.getElementsByClassName("view-content")[0]
+		var latencyWindow = ["calibration", "audio", "video", "drumSounds"]
+		for(let i in latencyWindow){
+			let current = latencyWindow[i]
+			var settingBox = document.createElement("div")
+			settingBox.classList.add("setting-box")
+			var nameDiv = document.createElement("div")
+			nameDiv.classList.add("setting-name", "stroke-sub")
+			var name = strings.settings.latency[current]
+			this.setAltText(nameDiv, name)
+			settingBox.appendChild(nameDiv)
+			let outputObject = {
+				id: current,
+				settingBox: settingBox,
+				nameDiv: nameDiv
+			}
+			if(current === "calibration"){
+				nameDiv.style.width = "100%"
+			}else{
+				var valueDiv = document.createElement("div")
+				valueDiv.classList.add("setting-value")
+				settingBox.appendChild(valueDiv)
+				var valueText = document.createTextNode("")
+				valueDiv.appendChild(valueText)
+				this.latencyGetValue(current, valueText)
+				if(current !== "drumSounds"){
+					var buttons = document.createElement("div")
+					buttons.classList.add("latency-buttons")
+					var buttonMinus = document.createElement("span")
+					buttonMinus.innerText = "-"
+					buttons.appendChild(buttonMinus)
+					this.addTouchRepeat(buttonMinus, event => {
+						this.latencySetAdjust(outputObject, -1)
+					})
+					var buttonPlus = document.createElement("span")
+					buttonPlus.innerText = "+"
+					buttons.appendChild(buttonPlus)
+					this.addTouchRepeat(buttonPlus, event => {
+						this.latencySetAdjust(outputObject, 1)
+					})
+					valueDiv.appendChild(buttons)
+				}
+			}
+			latencyContent.appendChild(settingBox)
+			if(this.latencyItems.length === this.latencySelected){
+				settingBox.classList.add("selected")
+			}
+			this.addTouch(settingBox, event => {
+				if(event.target.tagName !== "SPAN"){
+					this.latencySetValue(current, event.type === "touchstart")
+				}
+			})
+			if(current !== "calibration"){
+				outputObject.valueDiv = valueDiv
+				outputObject.valueText = valueText
+				outputObject.buttonMinus = buttonMinus
+				outputObject.buttonPlus = buttonPlus
+			}
+			this.latencyItems.push(outputObject)
+		}
+		this.latencyDefaultButton = document.getElementById("latency-default")
+		this.latencyItems.push({
+			id: "default",
+			settingBox: this.latencyDefaultButton
+		})
+		this.addTouch(this.latencyDefaultButton, event => this.latencyDefault())
+		this.latencyEndButton = this.latencySettings.getElementsByClassName("view-end-button")[0]
+		this.latencyItems.push({
+			id: "back",
+			settingBox: this.latencyEndButton
+		})
+		this.addTouch(this.latencyEndButton, event => this.latencyBack(true))
+		
 		this.setStrings()
 		
+		this.drumSounds = settings.getItem("latency").drumSounds
+		this.playedSounds = {}
+		this.redrawRunning = true
+		this.redrawBind = this.redraw.bind(this)
+		this.redraw()
+		if(toSetting === "latency"){
+			this.mode = "latency"
+			this.latencySet()
+		}
 		pageEvents.send("settings")
 	}
 	getElement(name){
@@ -246,6 +374,23 @@ class SettingsView{
 			callback(event)
 		})
 	}
+	addTouchRepeat(element, callback){
+		this.addTouch(element, event => {
+			var active = true
+			var func = () => {
+				active = false
+				this.touchEnd.splice(this.touchEnd.indexOf(func), 1)
+			}
+			this.touchEnd.push(func)
+			var repeat = delay => {
+				if(active){
+					callback()
+					setTimeout(() => repeat(50), delay)
+				}
+			}
+			repeat(400)
+		})
+	}
 	removeTouch(element){
 		pageEvents.remove(element, ["mousedown", "touchstart"])
 	}
@@ -274,6 +419,17 @@ class SettingsView{
 				valueDiv.appendChild(keyDiv)
 			}
 			return
+		}else if(current.type === "latency"){
+			var audioVideo = [Math.round(value.audio), Math.round(value.video)]
+			var latencyValue = strings.settings[name].value.split("%s")
+			var latencyIndex = 0
+			value = ""
+			latencyValue.forEach((string, i) => {
+				if(i !== 0){
+					value += this.addMs(audioVideo[latencyIndex++])
+				}
+				value += string
+			})
 		}
 		valueDiv.innerText = value
 	}
@@ -285,6 +441,7 @@ class SettingsView{
 		if(this.mode !== "settings"){
 			if(this.selected === selectedIndex){
 				this.keyboardBack(selected)
+				this.playSound("se_don")
 			}
 			return
 		}
@@ -303,24 +460,37 @@ class SettingsView{
 			selected.valueDiv.classList.add("selected")
 			this.keyboardKeys = {}
 			this.keyboardSet()
-			assets.sounds["se_don"].play()
+			this.playSound("se_don")
 			return
 		}else if(current.type === "gamepad"){
 			this.mode = "gamepad"
 			this.gamepadSelected = current.options.indexOf(value)
 			this.gamepadSet()
-			assets.sounds["se_don"].play()
+			this.playSound("se_don")
+			return
+		}else if(current.type === "latency"){
+			this.mode = "latency"
+			this.latencySet()
+			this.playSound("se_don")
 			return
 		}
 		settings.setItem(name, value)
 		this.getValue(name, this.items[this.selected].valueDiv)
-		assets.sounds["se_ka"].play()
+		this.playSound("se_ka")
 		if(current.type === "language"){
 			this.setLang(allStrings[value])
 		}
 	}
-	keyPressed(pressed, name, event){
-		if(!pressed){
+	keyPressed(pressed, name, event, repeat){
+		if(pressed){
+			if(!this.pressedKeys[name]){
+				this.pressedKeys[name] = this.getMS() + 300
+			}
+		}else{
+			this.pressedKeys[name] = 0
+			return
+		}
+		if(repeat && name !== "up" && name !== "right" && name !== "down" && name !== "left"){
 			return
 		}
 		this.touched = false
@@ -334,31 +504,31 @@ class SettingsView{
 				}else{
 					this.setValue(selected.id)
 				}
-			}else if(name === "up" || name === "previous" || name === "next"){
+			}else if(name === "up" || name === "right" || name === "down" || name === "left"){
 				selected.settingBox.classList.remove("selected")
 				do{
-					this.selected = this.mod(this.items.length, this.selected + (name === "next" ? 1 : -1))
-				}while(this.items[this.selected].id === "default" && name !== "previous")
+					this.selected = this.mod(this.items.length, this.selected + ((name === "right" || name === "down") ? 1 : -1))
+				}while(this.items[this.selected].id === "default" && name !== "left")
 				selected = this.items[this.selected]
 				selected.settingBox.classList.add("selected")
 				selected.settingBox.scrollIntoView()
-				assets.sounds["se_ka"].play()
+				this.playSound("se_ka")
 			}else if(name === "back"){
 				this.onEnd()
 			}
 		}else if(this.mode === "gamepad"){
 			if(name === "confirm"){
 				this.gamepadBack(true)
-			}else if(name === "up" || name === "previous" || name === "next"){
-				this.gamepadSet(name === "next" ? 1 : -1)
+			}else if(name === "up" || name === "right" || name === "down" || name === "left"){
+				this.gamepadSet((name === "right" || name === "down") ? 1 : -1)
 			}else if(name === "back"){
 				this.gamepadBack()
 			}
 		}else if(this.mode === "keyboard"){
 			if(name === "back"){
 				this.keyboardBack(selected)
-				assets.sounds["se_cancel"].play()
-			}else{
+				this.playSound("se_cancel")
+			}else if(event){
 				event.preventDefault()
 				var currentKey = event.key.toLowerCase()
 				for(var i in this.keyboardKeys){
@@ -367,10 +537,40 @@ class SettingsView{
 					}
 				}
 				var current = this.keyboardCurrent
-				assets.sounds[current === "ka_l" || current === "ka_r" ? "se_ka" : "se_don"].play()
+				this.playSound(current === "ka_l" || current === "ka_r" ? "se_ka" : "se_don")
 				this.keyboardKeys[current] = [currentKey]
 				this.keyboardSet()
 			}
+		}else if(this.mode === "latency"){
+			var latencySelected = this.latencyItems[this.latencySelected]
+			if(name === "confirm"){
+				if(latencySelected.id === "back"){
+					this.latencyBack(true)
+				}else if(latencySelected.id === "default"){
+					this.latencyDefault()
+				}else{
+					this.latencySetValue(latencySelected.id)
+				}
+			}else if(name === "up" || name === "right" || name === "down" || name === "left"){
+				latencySelected.settingBox.classList.remove("selected")
+				do{
+					this.latencySelected = this.mod(this.latencyItems.length, this.latencySelected + ((name === "right" || name === "down") ? 1 : -1))
+				}while(this.latencyItems[this.latencySelected].id === "default" && name !== "left")
+				latencySelected = this.latencyItems[this.latencySelected]
+				latencySelected.settingBox.classList.add("selected")
+				latencySelected.settingBox.scrollIntoView()
+				this.playSound("se_ka")
+			}else if(name === "back"){
+				this.latencyBack()
+			}
+		}else if(this.mode === "latencySet"){
+			var latencySelected = this.latencyItems[this.latencySelected]
+			if(name === "confirm" || name === "back"){
+				this.latencySetBack(latencySelected)
+				this.playSound(name === "confirm" ? "se_don" : "se_cancel")
+			}else if(name === "up" || name === "right" || name === "down" || name === "left"){
+				this.latencySetAdjust(latencySelected, (name === "up" || name === "right") ? 1 : -1)
+			}
 		}
 	}
 	keyboardSet(){
@@ -416,14 +616,13 @@ class SettingsView{
 		var current = settings.items[selected.id]
 		if(diff){
 			this.gamepadSelected = this.mod(current.options.length, this.gamepadSelected + diff)
-			assets.sounds["se_ka"].play()
+			this.playSound("se_ka")
 		}
 		var opt = current.options[this.gamepadSelected]
 		var value = strings.settings[selected.id][opt]
-		this.gamepadValue.innerText = value
-		this.gamepadValue.setAttribute("alt", value)
-		this.gamepadButtons.style.backgroundPosition = "0 " + (-318 - 132 * this.gamepadSelected) + "px"
-		this.gamepadSettings.style.display = "block"
+		this.setAltText(this.gamepadValue, value)
+		this.gamepadButtons.style.backgroundPosition = "0 " + (-11.87 - 4.93 * this.gamepadSelected) + "em"
+		this.gamepadSettings.style.display = "flex"
 	}
 	gamepadBack(confirm){
 		if(this.mode !== "gamepad"){
@@ -433,10 +632,142 @@ class SettingsView{
 		var current = settings.items[selected.id]
 		settings.setItem(selected.id, current.options[this.gamepadSelected])
 		this.getValue(selected.id, selected.valueDiv)
-		assets.sounds[confirm ? "se_don" : "se_cancel"].play()
+		this.playSound(confirm ? "se_don" : "se_cancel")
 		this.gamepadSettings.style.display = ""
 		this.mode = "settings"
 	}
+	latencySet(){
+		if(this.mode !== "latency"){
+			return
+		}
+		var selected = this.items[this.selected]
+		var current = settings.items[selected.id]
+		this.latencySettings.style.display = "flex"
+	}
+	latencyGetValue(name, valueText){
+		var currentLatency = settings.getItem("latency")
+		if(name === "drumSounds"){
+			valueText.data = currentLatency[name] ? strings.settings.on : strings.settings.off
+		}else{
+			valueText.data = this.addMs(currentLatency[name] || 0)
+		}
+	}
+	latencySetValue(name, touched){
+		var selectedIndex = this.latencyItems.findIndex(item => item.id === name)
+		var selected = this.latencyItems[selectedIndex]
+		if(this.mode === "latencySet"){
+			this.latencySetBack(this.latencyItems[this.latencySelected])
+			if(this.latencySelected === selectedIndex){
+				this.playSound("se_don")
+				return
+			}
+		}else if(this.mode !== "latency"){
+			return
+		}
+		if(name === "calibration"){
+			this.playSound("se_don")
+			this.clean()
+			new LoadSong({
+				"title": strings.calibration.title,
+				"folder": "calibration",
+				"type": "tja",
+				"songSkin": {}
+			}, false, false, touched)
+		}else if(name === "drumSounds"){
+			this.drumSounds = !settings.getItem("latency")[name]
+			this.latencySave(name, this.drumSounds)
+			this.latencyGetValue(name, selected.valueText)
+			this.playSound("se_don")
+		}else{
+			var value = Math.round(settings.getItem("latency")[name] || 0)
+			if(this.latencySelected !== selectedIndex){
+				this.latencyItems[this.latencySelected].settingBox.classList.remove("selected")
+				this.latencySelected = selectedIndex
+				selected.settingBox.classList.add("selected")
+			}
+			this.mode = "latencySet"
+			selected.settingBox.style.animation = "none"
+			selected.valueDiv.classList.add("selected")
+			selected.value = value
+			this.playSound("se_don")
+		}
+	}
+	latencySetAdjust(selected, add){
+		selected.value += add
+		if(selected.value > 500){
+			selected.value = 500
+		}else if(selected.value < -200){
+			selected.value = -200
+		}else{
+			this.playSound("se_ka")
+		}
+		selected.valueText.data = this.addMs(selected.value)
+	}
+	latencySetBack(selected){
+		this.mode = "latency"
+		selected.settingBox.style.animation = ""
+		selected.valueDiv.classList.remove("selected")
+		this.latencySave(selected.id, selected.value)
+		this.latencyGetValue(selected.id, selected.valueText)
+	}
+	latencySave(id, value){
+		var input = settings.getItem("latency")
+		var output = {}
+		for(var i in input){
+			if(i === id){
+				output[i] = value
+			}else{
+				output[i] = input[i]
+			}
+		}
+		settings.setItem("latency", output)
+	}
+	latencyDefault(){
+		if(this.mode === "latencySet"){
+			this.latencySetBack(this.latencyItems[this.latencySelected])
+		}else if(this.mode !== "latency"){
+			return
+		}
+		settings.setItem("latency", null)
+		this.latencyItems.forEach(item => {
+			if(item.id === "audio" || item.id === "video" || item.id === "drumSounds"){
+				this.latencyGetValue(item.id, item.valueText)
+			}
+		})
+		this.drumSounds = settings.getItem("latency").drumSounds
+		this.playSound("se_don")
+	}
+	latencyBack(confirm){
+		if(this.mode === "latencySet"){
+			this.latencySetBack(this.latencyItems[this.latencySelected])
+			if(!confirm){
+				this.playSound("se_don")
+				return
+			}
+		}
+		if(this.mode !== "latency"){
+			return
+		}
+		var selected = this.items[this.selected]
+		var current = settings.items[selected.id]
+		this.getValue(selected.id, selected.valueDiv)
+		this.playSound(confirm ? "se_don" : "se_cancel")
+		this.latencySettings.style.display = ""
+		this.mode = "settings"
+	}
+	addMs(input){
+		var split = strings.calibration.ms.split("%s")
+		var index = 0
+		var output = ""
+		var inputStrings = [(input > 0 ? "+" : "") + input.toString()]
+		split.forEach((string, i) => {
+			if(i !== 0){
+				output += inputStrings[index++]
+			}
+			output += string
+		})
+		return output
+	}
 	defaultSettings(){
 		if(this.mode === "keyboard"){
 			this.keyboardBack(this.items[this.selected])
@@ -447,11 +778,17 @@ class SettingsView{
 		this.setLang(allStrings[settings.getItem("language")])
 		this.keyboard.update()
 		pageEvents.setKbd()
-		assets.sounds["se_don"].play()
+		this.latencyItems.forEach(item => {
+			if(item.id === "audio" || item.id === "video" || item.id === "drumSounds"){
+				this.latencyGetValue(item.id, item.valueText)
+			}
+		})
+		this.drumSounds = settings.getItem("latency").drumSounds
+		this.playSound("se_don")
 	}
 	onEnd(){
 		this.clean()
-		assets.sounds["se_don"].play()
+		this.playSound("se_don")
 		setTimeout(() => {
 			if(this.tutorial && !this.touched){
 				new Tutorial(false, this.songId)
@@ -472,41 +809,94 @@ class SettingsView{
 			var item = this.items[i]
 			if(item.valueDiv){
 				var name = strings.settings[item.id].name
-				item.nameDiv.innerText = name
-				item.nameDiv.setAttribute("alt", name)
+				this.setAltText(item.nameDiv, name)
 				this.getValue(item.id, item.valueDiv)
 			}
 		}
+		for(var i in this.latencyItems){
+			var current = this.latencyItems[i]
+			if(current.nameDiv){
+				this.setAltText(current.nameDiv, strings.settings.latency[current.id])
+			}
+			if(current.valueText){
+				this.latencyGetValue(current.id, current.valueText)
+			}
+		}
 		this.setStrings()
 	}
 	setStrings(){
-		this.viewTitle.innerText = strings.gameSettings
-		this.viewTitle.setAttribute("alt", strings.gameSettings)
-		this.endButton.innerText = strings.settings.ok
-		this.endButton.setAttribute("alt", strings.settings.ok)
-		this.gamepadTitle.innerText = strings.settings.gamepadLayout.name
-		this.gamepadTitle.setAttribute("alt", strings.settings.gamepadLayout.name)
-		this.gamepadEndButton.innerText = strings.settings.ok
-		this.gamepadEndButton.setAttribute("alt", strings.settings.ok)
-		this.defaultButton.innerText = strings.settings.default
-		this.defaultButton.setAttribute("alt", strings.settings.default)
+		this.setAltText(this.viewTitle, strings.gameSettings)
+		this.setAltText(this.endButton, strings.settings.ok)
+		this.setAltText(this.gamepadTitle, strings.settings.gamepadLayout.name)
+		this.setAltText(this.gamepadEndButton, strings.settings.ok)
+		this.setAltText(this.latencyTitle, strings.settings.latency.name)
+		this.setAltText(this.latencyDefaultButton, strings.settings.default)
+		this.setAltText(this.latencyEndButton, strings.settings.ok)
+		this.setAltText(this.defaultButton, strings.settings.default)
+	}
+	setAltText(element, text){
+		element.innerText = text
+		element.setAttribute("alt", text)
 	}
 	mod(length, index){
 		return ((index % length) + length) % length
 	}
+	playSound(id, time){
+		if(!this.drumSounds && (id === "se_don" || id === "se_ka" || id === "se_cancel")){
+			return
+		}
+		var ms = Date.now() + (time || 0) * 1000
+		if(!(id in this.playedSounds) || ms > this.playedSounds[id] + 30){
+			assets.sounds[id].play(time)
+			this.playedSounds[id] = ms
+		}
+	}
+	redraw(){
+		if(!this.redrawRunning){
+			return
+		}
+		requestAnimationFrame(this.redrawBind)
+		var ms = this.getMS()
+		
+		for(var key in this.pressedKeys){
+			if(this.pressedKeys[key]){
+				if(ms >= this.pressedKeys[key] + 50){
+					this.keyPressed(true, key, null, true)
+					this.pressedKeys[key] = ms
+				}
+			}
+		}
+	}
+	getMS(){
+		return Date.now()
+	}
 	clean(){
+		this.redrawRunning = false
 		this.keyboard.clean()
 		this.gamepad.clean()
 		assets.sounds["bgm_settings"].stop()
+		pageEvents.remove(this.viewOuter, ["mouseup", "touchend"])
 		for(var i in this.items){
 			this.removeTouch(this.items[i].settingBox)
 		}
+		for(var i in this.latencyItems){
+			this.removeTouch(this.latencyItems[i].settingBox)
+			if(this.latencyItems[i].buttonMinus){
+				this.removeTouch(this.latencyItems[i].buttonMinus)
+				this.removeTouch(this.latencyItems[i].buttonPlus)
+			}
+		}
 		if(this.defaultButton){
 			delete this.defaultButton
 		}
 		this.removeTouch(this.gamepadSettings)
 		this.removeTouch(this.gamepadEndButton)
 		this.removeTouch(this.gamepadBox)
+		this.removeTouch(this.latencySettings)
+		this.removeTouch(this.latencyDefaultButton)
+		this.removeTouch(this.latencyEndButton)
+		delete this.viewOuter
+		delete this.touchEnd
 		delete this.tutorialTitle
 		delete this.endButton
 		delete this.items
@@ -516,6 +906,11 @@ class SettingsView{
 		delete this.gamepadBox
 		delete this.gamepadButtons
 		delete this.gamepadValue
+		delete this.latencyItems
+		delete this.latencySettings
+		delete this.latencyTitle
+		delete this.latencyDefaultButton
+		delete this.latencyEndButton
 		if(this.resolution !== settings.getItem("resolution")){
 			for(var i in assets.image){
 				if(i === "touch_drum" || i.startsWith("bg_song_") || i.startsWith("bg_stage_") || i.startsWith("bg_don_")){

public/src/js/songselect.js

@@ -5,6 +5,14 @@ class SongSelect{
 		loader.changePage("songselect", false)
 		this.canvas = document.getElementById("song-sel-canvas")
 		this.ctx = this.canvas.getContext("2d")
+		var resolution = settings.getItem("resolution")
+		var noSmoothing = resolution === "low" || resolution === "lowest"
+		if(noSmoothing){
+			this.ctx.imageSmoothingEnabled = false
+		}
+		if(resolution === "lowest"){
+			this.canvas.style.imageRendering = "pixelated"
+		}
 
 		this.songSkin = {
 			"selected": {
@@ -207,13 +215,13 @@ class SongSelect{
 		}]
 		this.optionsList = [strings.none, strings.auto, strings.netplay]
 		
-		this.draw = new CanvasDraw()
-		this.songTitleCache = new CanvasCache()
-		this.selectTextCache = new CanvasCache()
-		this.categoryCache = new CanvasCache()
-		this.difficultyCache = new CanvasCache()
-		this.sessionCache = new CanvasCache()
-		this.currentSongCache = new CanvasCache()
+		this.draw = new CanvasDraw(noSmoothing)
+		this.songTitleCache = new CanvasCache(noSmoothing)
+		this.selectTextCache = new CanvasCache(noSmoothing)
+		this.categoryCache = new CanvasCache(noSmoothing)
+		this.difficultyCache = new CanvasCache(noSmoothing)
+		this.sessionCache = new CanvasCache(noSmoothing)
+		this.currentSongCache = new CanvasCache(noSmoothing)
 		
 		this.difficulty = [strings.easy, strings.normal, strings.hard, strings.oni]
 		this.difficultyId = ["easy", "normal", "hard", "oni", "ura"]
@@ -234,6 +242,9 @@ class SongSelect{
 			fromTutorial = false
 		}
 		
+		this.drumSounds = settings.getItem("latency").drumSounds
+		this.playedSounds = {}
+		
 		var songIdIndex = -1
 		if(fromTutorial){
 			this.selectedSong = this.songs.findIndex(song => song.action === fromTutorial)
@@ -252,7 +263,7 @@ class SongSelect{
 			}else if((!p2.session || fadeIn) && "selectedSong" in localStorage){
 				this.selectedSong = Math.min(Math.max(0, localStorage["selectedSong"] |0), this.songs.length - 1)
 			}
-			assets.sounds[songIdIndex !== -1 ? "v_diffsel" : "v_songsel"].play()
+			this.playSound(songIdIndex !== -1 ? "v_diffsel" : "v_songsel")
 			snd.musicGain.fadeOut()
 			this.playBgm(false)
 		}
@@ -436,7 +447,7 @@ class SongSelect{
 				window.open(this.songs[this.selectedSong].maker.url)
 			}else if(moveBy === this.diffOptions.length + 4){
 				this.state.ura = !this.state.ura
-				assets.sounds["se_ka"].play()
+				this.playSound("se_ka")
 				if(this.selectedDiff === this.diffOptions.length + 4 && !this.state.ura){
 					this.state.move = -1
 				}
@@ -564,7 +575,7 @@ class SongSelect{
 			var soundsDelay = Math.abs((scroll + resize) / moveBy)
 			
 			for(var i = 0; i < Math.abs(moveBy) - 1; i++){
-				assets.sounds["se_ka"].play((resize + i * soundsDelay) / 1000)
+				this.playSound("se_ka", (resize + i * soundsDelay) / 1000)
 			}
 			this.pointer(false)
 		}
@@ -574,7 +585,7 @@ class SongSelect{
 			this.state.move = moveBy
 			this.state.moveMS = this.getMS() - 500
 			this.state.locked = 1
-			assets.sounds["se_ka"].play()
+			this.playSound("se_ka")
 		}
 	}
 	
@@ -605,15 +616,15 @@ class SongSelect{
 					this.selectedDiff = this.diffOptions.length + 3
 				}
 				
-				assets.sounds["se_don"].play()
+				this.playSound("se_don")
 				assets.sounds["v_songsel"].stop()
-				assets.sounds["v_diffsel"].play(0.3)
+				this.playSound("v_diffsel", 0.3)
 				pageEvents.send("song-select-difficulty", currentSong)
 			}else if(currentSong.action === "back"){
 				this.clean()
 				this.toTitleScreen()
 			}else if(currentSong.action === "random"){
-				assets.sounds["se_don"].play()
+				this.playSound("se_don")
 				this.state.locked = true
 				do{
 					var i = Math.floor(Math.random() * this.songs.length)
@@ -650,7 +661,7 @@ class SongSelect{
 			this.state.moveHover = null
 			
 			assets.sounds["v_diffsel"].stop()
-			assets.sounds["se_cancel"].play()
+			this.playSound("se_cancel")
 		}
 		this.clearHash()
 		pageEvents.send("song-select-back")
@@ -659,7 +670,7 @@ class SongSelect{
 		this.clean()
 		var selectedSong = this.songs[this.selectedSong]
 		assets.sounds["v_diffsel"].stop()
-		assets.sounds["se_don"].play()
+		this.playSound("se_don")
 		
 		try{
 			if(assets.customSongs){
@@ -698,7 +709,7 @@ class SongSelect{
 	}
 	toOptions(moveBy){
 		if(!p2.session){
-			assets.sounds["se_ka"].play()
+			this.playSound("se_ka")
 			this.selectedDiff = 1
 			do{
 				this.state.options = this.mod(this.optionsList.length, this.state.options + moveBy)
@@ -707,7 +718,7 @@ class SongSelect{
 	}
 	toTitleScreen(){
 		if(!p2.session){
-			assets.sounds["se_cancel"].play()
+			this.playSound("se_cancel")
 			this.clean()
 			setTimeout(() => {
 				new Titlescreen()
@@ -715,21 +726,21 @@ class SongSelect{
 		}
 	}
 	toTutorial(){
-		assets.sounds["se_don"].play()
+		this.playSound("se_don")
 		this.clean()
 		setTimeout(() => {
 			new Tutorial(true)
 		}, 500)
 	}
 	toAbout(){
-		assets.sounds["se_don"].play()
+		this.playSound("se_don")
 		this.clean()
 		setTimeout(() => {
 			new About(this.touchEnabled)
 		}, 500)
 	}
 	toSettings(){
-		assets.sounds["se_don"].play()
+		this.playSound("se_don")
 		this.clean()
 		setTimeout(() => {
 			new SettingsView(this.touchEnabled)
@@ -744,7 +755,7 @@ class SongSelect{
 		}else{
 			localStorage["selectedSong"] = this.selectedSong
 
-			assets.sounds["se_don"].play()
+			this.playSound("se_don")
 			this.clean()
 			setTimeout(() => {
 				new Session(this.touchEnabled)
@@ -755,7 +766,7 @@ class SongSelect{
 		if(assets.customSongs){
 			assets.customSongs = false
 			assets.songs = assets.songsDefault
-			assets.sounds["se_don"].play()
+			this.playSound("se_don")
 			this.clean()
 			setTimeout(() => {
 				new SongSelect("browse", false, this.touchEnabled)
@@ -984,7 +995,7 @@ class SongSelect{
 			var scroll = resize2 - resize - scrollDelay * 2
 			var elapsed = ms - this.state.moveMS
 			if(this.state.move && ms > this.state.moveMS + resize2 - scrollDelay){
-				assets.sounds["se_ka"].play()
+				this.playSound("se_ka")
 				var previousSelectedSong = this.selectedSong
 				this.selectedSong = this.mod(this.songs.length, this.selectedSong + this.state.move)
 				if(previousSelectedSong !== this.selectedSong){
@@ -2041,6 +2052,17 @@ class SongSelect{
 		}
 	}
 	
+	playSound(id, time){
+		if(!this.drumSounds && (id === "se_don" || id === "se_ka" || id === "se_cancel")){
+			return
+		}
+		var ms = Date.now() + (time || 0) * 1000
+		if(!(id in this.playedSounds) || ms > this.playedSounds[id] + 30){
+			assets.sounds[id].play(time)
+			this.playedSounds[id] = ms
+		}
+	}
+	
 	getMS(){
 		return Date.now()
 	}

public/src/js/strings.js

@@ -126,11 +126,42 @@
 			b: "タイプB",
 			c: "タイプC"
 		},
+		latency: {
+			name: "Latency",
+			value: "Audio: %s, Video: %s",
+			calibration: "Latency Calibration",
+			audio: "Audio",
+			video: "Video",
+			drumSounds: "Drum Sounds"
+		},
 		on: "オン",
 		off: "オフ",
 		default: "既定値にリセット",
 		ok: "OK"
 	}
+	this.calibration = {
+		title: "Latency Calibration",
+		ms: "%sms",
+		back: "Back to Settings",
+		retryPrevious: "Retry Previous",
+		start: "Start",
+		finish: "Finish",
+		audioHelp: {
+			title: "Audio Latency Calibration",
+			content: "Listen to a sound playing in the background.\n\nHit the surface of the drum (%s or %s) as you hear it!",
+			contentAlt: "Listen to a sound playing in the background.\n\nHit the surface of the drum as you hear it!"
+		},
+		audioComplete: "Audio Latency Calibration completed!",
+		videoHelp: {
+			title: "Video Latency Calibration",
+			content: "This time there will be no sounds.\n\nInstead, watch for notes blinking on the circle-shaped frame, hit the drum as they appear!"
+		},
+		videoComplete: "Video Latency Calibration completed!",
+		results: {
+			title: "Latency Calibration Results",
+			content: "Audio latency: %s\nVideo latency: %s\n\nYou can configure these latency values in the settings."
+		}
+	}
 	this.browserSupport = {
 		browserWarning: "サポートされていないブラウザを実行しています (%s)",
 		details: "詳しく",
@@ -270,11 +301,42 @@ function StringsEn(){
 			b: "Type B",
 			c: "Type C"
 		},
+		latency: {
+			name: "Latency",
+			value: "Audio: %s, Video: %s",
+			calibration: "Latency Calibration",
+			audio: "Audio",
+			video: "Video",
+			drumSounds: "Drum Sounds"
+		},
 		on: "On",
 		off: "Off",
 		default: "Reset to Defaults",
 		ok: "OK"
 	}
+	this.calibration = {
+		title: "Latency Calibration",
+		ms: "%sms",
+		back: "Back to Settings",
+		retryPrevious: "Retry Previous",
+		start: "Start",
+		finish: "Finish",
+		audioHelp: {
+			title: "Audio Latency Calibration",
+			content: "Listen to a sound playing in the background.\n\nHit the surface of the drum (%s or %s) as you hear it!",
+			contentAlt: "Listen to a sound playing in the background.\n\nHit the surface of the drum as you hear it!"
+		},
+		audioComplete: "Audio Latency Calibration completed!",
+		videoHelp: {
+			title: "Video Latency Calibration",
+			content: "This time there will be no sounds.\n\nInstead, watch for notes blinking on the circle-shaped frame, hit the drum as they appear!"
+		},
+		videoComplete: "Video Latency Calibration completed!",
+		results: {
+			title: "Latency Calibration Results",
+			content: "Audio latency: %s\nVideo latency: %s\n\nYou can configure these latency values in the settings."
+		}
+	}
 	this.browserSupport = {
 		browserWarning: "You are running an unsupported browser (%s)",
 		details: "Details...",
@@ -414,11 +476,42 @@ function StringsCn(){
 			b: "类型B",
 			c: "类型C"
 		},
+		latency: {
+			name: "Latency",
+			value: "Audio: %s, Video: %s",
+			calibration: "Latency Calibration",
+			audio: "Audio",
+			video: "Video",
+			drumSounds: "Drum Sounds"
+		},
 		on: "开",
 		off: "关",
 		default: "重置为默认值",
 		ok: "确定"
 	}
+	this.calibration = {
+		title: "Latency Calibration",
+		ms: "%sms",
+		back: "Back to Settings",
+		retryPrevious: "Retry Previous",
+		start: "Start",
+		finish: "Finish",
+		audioHelp: {
+			title: "Audio Latency Calibration",
+			content: "Listen to a sound playing in the background.\n\nHit the surface of the drum (%s or %s) as you hear it!",
+			contentAlt: "Listen to a sound playing in the background.\n\nHit the surface of the drum as you hear it!"
+		},
+		audioComplete: "Audio Latency Calibration completed!",
+		videoHelp: {
+			title: "Video Latency Calibration",
+			content: "This time there will be no sounds.\n\nInstead, watch for notes blinking on the circle-shaped frame, hit the drum as they appear!"
+		},
+		videoComplete: "Video Latency Calibration completed!",
+		results: {
+			title: "Latency Calibration Results",
+			content: "Audio latency: %s\nVideo latency: %s\n\nYou can configure these latency values in the settings."
+		}
+	}
 	this.browserSupport = {
 		browserWarning: "You are running an unsupported browser (%s)",
 		details: "Details...",
@@ -558,11 +651,42 @@ function StringsTw(){
 			b: "類型B",
 			c: "類型C"
 		},
+		latency: {
+			name: "Latency",
+			value: "Audio: %s, Video: %s",
+			calibration: "Latency Calibration",
+			audio: "Audio",
+			video: "Video",
+			drumSounds: "Drum Sounds"
+		},
 		on: "開",
 		off: "關",
 		default: "重置為默認值",
 		ok: "確定"
 	}
+	this.calibration = {
+		title: "Latency Calibration",
+		ms: "%sms",
+		back: "Back to Settings",
+		retryPrevious: "Retry Previous",
+		start: "Start",
+		finish: "Finish",
+		audioHelp: {
+			title: "Audio Latency Calibration",
+			content: "Listen to a sound playing in the background.\n\nHit the surface of the drum (%s or %s) as you hear it!",
+			contentAlt: "Listen to a sound playing in the background.\n\nHit the surface of the drum as you hear it!"
+		},
+		audioComplete: "Audio Latency Calibration completed!",
+		videoHelp: {
+			title: "Video Latency Calibration",
+			content: "This time there will be no sounds.\n\nInstead, watch for notes blinking on the circle-shaped frame, hit the drum as they appear!"
+		},
+		videoComplete: "Video Latency Calibration completed!",
+		results: {
+			title: "Latency Calibration Results",
+			content: "Audio latency: %s\nVideo latency: %s\n\nYou can configure these latency values in the settings."
+		}
+	}
 	this.browserSupport = {
 		browserWarning: "You are running an unsupported browser (%s)",
 		details: "Details...",
@@ -702,11 +826,42 @@ function StringsKo(){
 			b: "타입 B",
 			c: "타입 C"
 		},
+		latency: {
+			name: "Latency",
+			value: "Audio: %s, Video: %s",
+			calibration: "Latency Calibration",
+			audio: "Audio",
+			video: "Video",
+			drumSounds: "Drum Sounds"
+		},
 		on: "온",
 		off: "오프",
 		default: "기본값으로 재설정",
 		ok: "확인"
 	}
+	this.calibration = {
+		title: "Latency Calibration",
+		ms: "%sms",
+		back: "Back to Settings",
+		retryPrevious: "Retry Previous",
+		start: "Start",
+		finish: "Finish",
+		audioHelp: {
+			title: "Audio Latency Calibration",
+			content: "Listen to a sound playing in the background.\n\nHit the surface of the drum (%s or %s) as you hear it!",
+			contentAlt: "Listen to a sound playing in the background.\n\nHit the surface of the drum as you hear it!"
+		},
+		audioComplete: "Audio Latency Calibration completed!",
+		videoHelp: {
+			title: "Video Latency Calibration",
+			content: "This time there will be no sounds.\n\nInstead, watch for notes blinking on the circle-shaped frame, hit the drum as they appear!"
+		},
+		videoComplete: "Video Latency Calibration completed!",
+		results: {
+			title: "Latency Calibration Results",
+			content: "Audio latency: %s\nVideo latency: %s\n\nYou can configure these latency values in the settings."
+		}
+	}
 	this.browserSupport = {
 		browserWarning: "You are running an unsupported browser (%s)",
 		details: "Details...",

public/src/js/view.js

@@ -4,8 +4,15 @@
 		
 		this.canvas = document.getElementById("canvas")
 		this.ctx = this.canvas.getContext("2d")
+		var resolution = settings.getItem("resolution")
+		var noSmoothing = resolution === "low" || resolution === "lowest"
+		if(noSmoothing){
+			this.ctx.imageSmoothingEnabled = false
+		}
+		if(resolution === "lowest"){
+			this.canvas.style.imageRendering = "pixelated"
+		}
 		
-		this.cursor = document.getElementById("cursor")
 		this.gameDiv = document.getElementById("game")
 		this.songBg = document.getElementById("songbg")
 		this.songStage = document.getElementById("song-stage")
@@ -73,6 +80,7 @@
 		}
 		this.nextBeat = 0
 		this.gogoTime = 0
+		this.gogoTimeStarted = -Infinity
 		this.drumroll = []
 		this.touchEvents = 0
 		if(this.controller.parsedSongData.branches){
@@ -103,16 +111,20 @@
 			}
 		}
 		
-		this.beatInterval = this.controller.parsedSongData.beatInfo.beatInterval
+		if(this.controller.calibrationMode){
+			this.beatInterval = 512
+		}else{
+			this.beatInterval = this.controller.parsedSongData.beatInfo.beatInterval
+		}
 		this.font = strings.font
 		
-		this.draw = new CanvasDraw()
+		this.draw = new CanvasDraw(noSmoothing)
 		this.assets = new ViewAssets(this)
 		
-		this.titleCache = new CanvasCache()
-		this.comboCache = new CanvasCache()
-		this.pauseCache = new CanvasCache()
-		this.branchCache = new CanvasCache()
+		this.titleCache = new CanvasCache(noSmoothing)
+		this.comboCache = new CanvasCache(noSmoothing)
+		this.pauseCache = new CanvasCache(noSmoothing)
+		this.branchCache = new CanvasCache(noSmoothing)
 		
 		this.multiplayer = this.controller.multiplayer
 		
@@ -120,6 +132,9 @@
 		this.touch = -Infinity
 		this.touchAnimation = settings.getItem("touchAnimation")
 		
+		versionDiv.classList.add("version-hide")
+		loader.screen.parentNode.insertBefore(versionDiv, loader.screen)
+		
 		if(this.multiplayer !== 2){
 			
 			if(this.controller.touchEnabled){
@@ -134,7 +149,6 @@
 				pageEvents.add(this.canvas, "touchstart", this.ontouch.bind(this))
 				
 				this.gameDiv.classList.add("touch-visible")
-				document.getElementById("version").classList.add("version-hide")
 				
 				this.touchFullBtn = document.getElementById("touch-full-btn")
 				pageEvents.add(this.touchFullBtn, "touchend", toggleFullscreen)
@@ -444,12 +458,14 @@
 			ctx.fill()
 			
 			// Difficulty
-			ctx.drawImage(assets.image["difficulty"],
-				0, 144 * this.difficulty[this.controller.selectedSong.difficulty],
-				168, 143,
-				126, this.multiplayer === 2 ? 497 : 228,
-				62, 53
-			)
+			if(this.controller.selectedSong.difficulty){
+				ctx.drawImage(assets.image["difficulty"],
+					0, 144 * this.difficulty[this.controller.selectedSong.difficulty],
+					168, 143,
+					126, this.multiplayer === 2 ? 497 : 228,
+					62, 53
+				)
+			}
 			
 			// Badges
 			if(this.controller.autoPlayEnabled && !this.controller.multiplayer){
@@ -593,24 +609,26 @@
 			ctx.globalAlpha = 1
 			
 			// Difficulty
-			ctx.drawImage(assets.image["difficulty"],
-				0, 144 * this.difficulty[this.controller.selectedSong.difficulty],
-				168, 143,
-				16, this.multiplayer === 2 ? 194 : 232,
-				141, 120
-			)
-			var diff = this.controller.selectedSong.difficulty
-			var text = strings[diff === "ura" ? "oni" : diff]
-			ctx.font = this.draw.bold(this.font) + "20px " + this.font
-			ctx.textAlign = "center"
-			ctx.textBaseline = "bottom"
-			ctx.strokeStyle = "#000"
-			ctx.fillStyle = "#fff"
-			ctx.lineWidth = 7
-			ctx.miterLimit = 1
-			ctx.strokeText(text, 87, this.multiplayer === 2 ? 310 : 348)
-			ctx.fillText(text, 87, this.multiplayer === 2 ? 310 : 348)
-			ctx.miterLimit = 10
+			if(this.controller.selectedSong.difficulty){
+				ctx.drawImage(assets.image["difficulty"],
+					0, 144 * this.difficulty[this.controller.selectedSong.difficulty],
+					168, 143,
+					16, this.multiplayer === 2 ? 194 : 232,
+					141, 120
+				)
+				var diff = this.controller.selectedSong.difficulty
+				var text = strings[diff === "ura" ? "oni" : diff]
+				ctx.font = this.draw.bold(this.font) + "20px " + this.font
+				ctx.textAlign = "center"
+				ctx.textBaseline = "bottom"
+				ctx.strokeStyle = "#000"
+				ctx.fillStyle = "#fff"
+				ctx.lineWidth = 7
+				ctx.miterLimit = 1
+				ctx.strokeText(text, 87, this.multiplayer === 2 ? 310 : 348)
+				ctx.fillText(text, 87, this.multiplayer === 2 ? 310 : 348)
+				ctx.miterLimit = 10
+			}
 			
 			// Badges
 			if(this.controller.autoPlayEnabled && !this.controller.multiplayer){
@@ -947,6 +965,20 @@
 		ctx.clip()
 		
 		this.drawCircles(this.controller.getCircles())
+		if(this.controller.game.calibrationState === "video"){
+			if(ms % this.beatInterval < 1000 / 60 * 5){
+				this.drawCircle({
+					ms: ms,
+					type: "don",
+					endTime: ms + 100,
+					speed: 0
+				}, {
+					x: this.slotPos.x,
+					y: this.slotPos.y
+				})
+			}
+		}
+		
 		ctx.restore()
 		
 		// Hit notes explosion
@@ -1001,6 +1033,22 @@
 				ctx.translate(frameLeft, frameTop)
 			}
 			
+			var state = this.controller.game.calibrationState
+			if(state && state in strings.calibration){
+				var boldTitle = strings.calibration[state].title
+			}
+			if(boldTitle){
+				this.draw.layeredText({
+					ctx: ctx,
+					text: boldTitle,
+					fontSize: 35,
+					fontFamily: this.font,
+					x: 300,
+					y: 70
+				}, [
+					{outline: "#fff", letterBorder: 22}
+				])
+			}
 			var pauseRect = (ctx, mul) => {
 				this.draw.roundedRect({
 					ctx: ctx,
@@ -1025,86 +1073,284 @@
 				dx: 68,
 				dy: 11
 			})
-			
-			ctx.drawImage(assets.image["mimizu"],
-				313, 247, 136, 315
-			)
-			
-			var _y = 108
-			var _w = 80
-			var _h = 464
-			for(var i = 0; i < this.pauseOptions.length; i++){
-				var _x = 520 + 110 * i
-				if(this.state.moveHover !== null){
-					var selected = i === this.state.moveHover
-				}else{
-					var selected = i === this.state.pausePos
-				}
-				if(selected){
-					ctx.fillStyle = "#ffb447"
-					this.draw.roundedRect({
-						ctx: ctx,
-						x: _x - _w / 2,
-						y: _y,
-						w: _w,
-						h: _h,
-						radius: 30
-					})
-					ctx.fill()
-				}
-				this.pauseCache.get({
+			if(boldTitle){
+				this.draw.layeredText({
 					ctx: ctx,
-					x: _x - _w / 2,
-					y: _y,
-					w: _w,
-					h: _h,
-					id: this.pauseOptions[i] + (selected ? "1" : "0")
-				}, ctx => {
-					var textConfig = {
+					text: boldTitle,
+					fontSize: 35,
+					fontFamily: this.font,
+					x: 300,
+					y: 70
+				}, [
+					{outline: "#000", letterBorder: 10},
+					{fill: "#fff"}
+				])
+			}
+			
+			switch(state){
+				case "audioHelp":
+				case "videoHelp":
+				case "results":
+					var content = state === "audioHelp" && this.touchEnabled ? "contentAlt" : "content"
+					if(state === "audioHelp"){
+						var kbdSettings = settings.getItem("keyboardSettings")
+						var keys = [
+							kbdSettings.don_l[0].toUpperCase(),
+							kbdSettings.don_r[0].toUpperCase()
+						]
+						var substitute = (config, index, width) => {
+							var ctx = config.ctx
+							var bold = this.draw.bold(config.fontFamily)
+							ctx.font = bold + (config.fontSize * 0.66) + "px " + config.fontFamily
+							var w = config.fontSize * 0.6 + ctx.measureText(keys[index]).width
+							if(width){
+								return w
+							}else{
+								var h = 30
+								ctx.lineWidth = 3
+								ctx.strokeStyle = "rgba(0, 0, 0, 0.2)"
+								this.draw.roundedRect({
+									ctx: ctx,
+									x: 0, y: 1, w: w, h: h,
+									radius: 3
+								})
+								ctx.stroke()
+								ctx.strokeStyle = "#ccc"
+								ctx.fillStyle = "#fff"
+								this.draw.roundedRect({
+									ctx: ctx,
+									x: 0, y: 0, w: w, h: h,
+									radius: 3
+								})
+								ctx.stroke()
+								ctx.fill()
+								ctx.fillStyle = "#f7f7f7"
+								ctx.fillRect(2, 2, w - 4, h - 4)
+								
+								ctx.fillStyle = "#333"
+								ctx.textBaseline = "middle"
+								ctx.textAlign = "center"
+								ctx.fillText(keys[index], w / 2, h / 2)
+							}
+						}
+					}else if(state === "results"){
+						var progress = this.controller.game.calibrationProgress
+						var latency = [
+							progress.audio,
+							progress.video
+						]
+						var substitute = (config, index, width) => {
+							var ctx = config.ctx
+							var bold = this.draw.bold(config.fontFamily)
+							ctx.font = bold + (config.fontSize * 1.1) + "px " + config.fontFamily
+							var text = this.addMs(latency[index])
+							if(width){
+								return ctx.measureText(text).width
+							}else{
+								ctx.fillText(text, 0, 0)
+							}
+						}
+					}else{
+						var substitute = null
+					}
+					this.draw.wrappingText({
 						ctx: ctx,
-						text: this.pauseOptions[i],
-						x: _w / 2,
-						y: 18,
-						width: _w,
-						height: _h - 54,
+						text: strings.calibration[state][content],
+						fontSize: 30,
+						fontFamily: this.font,
+						x: 300,
+						y: 130,
+						width: 680,
+						height: 240,
+						lineHeight: 35,
+						fill: "#000",
+						verticalAlign: "middle",
+						substitute: substitute
+					})
+					
+					var _x = 640
+					var _w = 464
+					var _h = 80
+					for(var i = 0; i < this.pauseOptions.length; i++){
+						var text = this.pauseOptions[i]
+						var _y = 470 - 90 * (this.pauseOptions.length - i - 1)
+						if(this.state.moveHover !== null){
+							var selected = i === this.state.moveHover
+						}else{
+							var selected = i === this.state.pausePos
+						}
+						if(selected){
+							ctx.fillStyle = "#ffb447"
+							this.draw.roundedRect({
+								ctx: ctx,
+								x: _x - _w / 2,
+								y: _y,
+								w: _w,
+								h: _h,
+								radius: 30
+							})
+							ctx.fill()
+						}
+						if(selected){
+							var layers = [
+								{outline: "#000", letterBorder: 10},
+								{fill: "#fff"}
+							]
+						}else{
+							var layers = [
+								{fill: "#000"}
+							]
+						}
+						this.draw.layeredText({
+							ctx: ctx,
+							text: text,
+							x: _x,
+							y: _y + 18,
+							width: _w,
+							height: _h - 54,
+							fontSize: 40,
+							fontFamily: this.font,
+							letterSpacing: -1,
+							align: "center"
+						}, layers)
+						
+						var highlight = 0
+						if(this.state.moveHover === i){
+							highlight = 2
+						}else if(selected){
+							highlight = 1
+						}
+						if(highlight){
+							this.draw.highlight({
+								ctx: ctx,
+								x: _x - _w / 2 - 3.5,
+								y: _y - 3.5,
+								w: _w + 7,
+								h: _h + 7,
+								animate: highlight === 1,
+								animateMS: this.state.moveMS,
+								opacity: highlight === 2 ? 0.8 : 1,
+								radius: 30
+							})
+						}
+					}
+					break
+				case "audioComplete":
+				case "videoComplete":
+					this.draw.wrappingText({
+						ctx: ctx,
+						text: strings.calibration[state],
 						fontSize: 40,
 						fontFamily: this.font,
-						letterSpacing: -1
-					}
-					if(selected){
-						textConfig.fill = "#fff"
-						textConfig.outline = "#000"
-						textConfig.outlineSize = 10
-					}else{
-						textConfig.fill = "#000"
-					}
-					this.draw.verticalText(textConfig)
-				})
-				
-				var highlight = 0
-				if(this.state.moveHover === i){
-					highlight = 2
-				}else if(selected){
-					highlight = 1
-				}
-				if(highlight){
-					this.draw.highlight({
-						ctx: ctx,
-						x: _x - _w / 2 - 3.5,
-						y: _y - 3.5,
-						w: _w + 7,
-						h: _h + 7,
-						animate: highlight === 1,
-						animateMS: this.state.moveMS,
-						opacity: highlight === 2 ? 0.8 : 1,
-						radius: 30
+						x: 300,
+						y: 130,
+						width: 680,
+						height: 420,
+						lineHeight: 47,
+						fill: "#000",
+						verticalAlign: "middle",
+						textAlign: "center",
 					})
-				}
+					break
+				default:
+					ctx.drawImage(assets.image["mimizu"],
+						313, 247, 136, 315
+					)
+					
+					var _y = 108
+					var _w = 80
+					var _h = 464
+					for(var i = 0; i < this.pauseOptions.length; i++){
+						var text = this.pauseOptions[i]
+						if(this.controller.calibrationMode && i === this.pauseOptions.length - 1){
+							text = strings.calibration.back
+						}
+						var _x = 520 + 110 * i
+						if(this.state.moveHover !== null){
+							var selected = i === this.state.moveHover
+						}else{
+							var selected = i === this.state.pausePos
+						}
+						if(selected){
+							ctx.fillStyle = "#ffb447"
+							this.draw.roundedRect({
+								ctx: ctx,
+								x: _x - _w / 2,
+								y: _y,
+								w: _w,
+								h: _h,
+								radius: 30
+							})
+							ctx.fill()
+						}
+						this.pauseCache.get({
+							ctx: ctx,
+							x: _x - _w / 2,
+							y: _y,
+							w: _w,
+							h: _h,
+							id: text + (selected ? "1" : "0")
+						}, ctx => {
+							var textConfig = {
+								ctx: ctx,
+								text: text,
+								x: _w / 2,
+								y: 18,
+								width: _w,
+								height: _h - 54,
+								fontSize: 40,
+								fontFamily: this.font,
+								letterSpacing: -1
+							}
+							if(selected){
+								textConfig.fill = "#fff"
+								textConfig.outline = "#000"
+								textConfig.outlineSize = 10
+							}else{
+								textConfig.fill = "#000"
+							}
+							this.draw.verticalText(textConfig)
+						})
+						
+						var highlight = 0
+						if(this.state.moveHover === i){
+							highlight = 2
+						}else if(selected){
+							highlight = 1
+						}
+						if(highlight){
+							this.draw.highlight({
+								ctx: ctx,
+								x: _x - _w / 2 - 3.5,
+								y: _y - 3.5,
+								w: _w + 7,
+								h: _h + 7,
+								animate: highlight === 1,
+								animateMS: this.state.moveMS,
+								opacity: highlight === 2 ? 0.8 : 1,
+								radius: 30
+							})
+						}
+					}
+					break
 			}
 			
 			ctx.restore()
 		}
 	}
+	addMs(input){
+		var split = strings.calibration.ms.split("%s")
+		var index = 0
+		var output = ""
+		var inputStrings = [(input > 0 ? "+" : "") + input.toString()]
+		split.forEach((string, i) => {
+			if(i !== 0){
+				output += inputStrings[index++]
+			}
+			output += string
+		})
+		return output
+	}
 	setBackground(){
 		var selectedSong = this.controller.selectedSong
 		var songSkinName = selectedSong.songSkin.name
@@ -1219,10 +1465,10 @@
 		
 		measures.forEach(measure => {
 			var timeForDistance = this.posToMs(distanceForCircle, measure.speed)
-			var startingTime = measure.ms - timeForDistance
-			var finishTime = measure.ms + this.posToMs(this.slotPos.x - this.slotPos.paddingLeft + 3, measure.speed)
+			var startingTime = measure.ms - timeForDistance + this.controller.videoLatency
+			var finishTime = measure.ms + this.posToMs(this.slotPos.x - this.slotPos.paddingLeft + 3, measure.speed) + this.controller.videoLatency
 			if(measure.visible && (!measure.branch || measure.branch.active) && ms >= startingTime && ms <= finishTime){
-				var measureX = this.slotPos.x + this.msToPos(measure.ms - ms, measure.speed)
+				var measureX = this.slotPos.x + this.msToPos(measure.ms - ms + this.controller.videoLatency, measure.speed)
 				this.ctx.strokeStyle = measure.branchFirst ? "#ff0" : "#bdbdbd"
 				this.ctx.lineWidth = 3
 				this.ctx.beginPath()
@@ -1267,8 +1513,8 @@
 			var speed = circle.speed
 			
 			var timeForDistance = this.posToMs(distanceForCircle + this.slotPos.size / 2, speed)
-			var startingTime = circle.ms - timeForDistance
-			var finishTime = circle.endTime + this.posToMs(this.slotPos.x - this.slotPos.paddingLeft + this.slotPos.size * 2, speed)
+			var startingTime = circle.ms - timeForDistance + this.controller.videoLatency
+			var finishTime = circle.endTime + this.posToMs(this.slotPos.x - this.slotPos.paddingLeft + this.slotPos.size * 2, speed) + this.controller.videoLatency
 			
 			if(circle.isPlayed <= 0 || circle.score === 0){
 				if((!circle.branch || circle.branch.active) && ms >= startingTime && ms <= finishTime && circle.isPlayed !== -1){
@@ -1350,7 +1596,7 @@
 		
 		if(!circlePos){
 			circlePos = {
-				x: this.slotPos.x + this.msToPos(circleMs - ms, speed),
+				x: this.slotPos.x + this.msToPos(circleMs - ms + this.controller.videoLatency, speed),
 				y: this.slotPos.y
 			}
 		}
@@ -1388,10 +1634,10 @@
 				size = circleSize
 				faceID = noteFace.small
 				var h = size * 1.8
-				if(circleMs < ms && ms <= endTime){
+				if(circleMs + this.controller.audioLatency < ms && ms <= endTime + this.controller.audioLatency){
 					circlePos.x = this.slotPos.x
-				}else if(ms > endTime){
-					circlePos.x = this.slotPos.x + this.msToPos(endTime - ms, speed)
+				}else if(ms > endTime + this.controller.audioLatency){
+					circlePos.x = this.slotPos.x + this.msToPos(endTime - ms + this.controller.audioLatency, speed)
 				}
 				ctx.drawImage(assets.image["balloon"],
 					circlePos.x + size - 4,
@@ -1596,7 +1842,9 @@
 	}
 	toggleGogoTime(circle){
 		this.gogoTime = circle.gogoTime
-		this.gogoTimeStarted = circle.ms
+		if(circle.gogoTime || this.gogoTimeStarted !== -Infinity){
+			this.gogoTimeStarted = circle.ms
+		}
 		
 		if(this.gogoTime){
 			this.assets.fireworks.forEach(fireworksAsset => {
@@ -1789,21 +2037,62 @@
 		if(typeof pos === "undefined"){
 			pos = this.state.pausePos
 		}
+		var game = this.controller.game
+		var state = game.calibrationState
+		switch(state){
+			case "audioHelp":
+				pos = pos === 0 ? 2 : 0
+				break
+			case "videoHelp":
+				if(pos === 0){
+					assets.sounds["se_don"].play()
+					game.calibrationReset("audio")
+					return
+				}else{
+					pos = 0
+				}
+				break
+			case "results":
+				if(pos === 0){
+					assets.sounds["se_don"].play()
+					game.calibrationReset("video")
+					return
+				}else{
+					var input = settings.getItem("latency")
+					var output = {}
+					var progress = game.calibrationProgress
+					for(var i in input){
+						if(i === "audio" || i === "video"){
+							output[i] = progress[i]
+						}else{
+							output[i] = input[i]
+						}
+					}
+					settings.setItem("latency", output)
+					pos = 2
+				}
+				break
+		}
 		switch(pos){
 			case 1:
-				assets.sounds["se_don"].play()
-				this.controller.restartSong()
+				this.controller.playSound("se_don", 0, true)
+				if(state === "video"){
+					game.calibrationReset(state)
+				}else{
+					this.controller.restartSong()
+				}
 				pageEvents.send("pause-restart")
 				break
 			case 2:
-				assets.sounds["se_don"].play()
+				this.controller.playSound("se_don", 0, true)
 				this.controller.songSelection()
 				pageEvents.send("pause-song-select")
 				break
 			default:
-				this.controller.togglePause()
+				this.controller.togglePause(false)
 				break
 		}
+		return true
 	}
 	onmousedown(event){
 		if(this.controller.game.paused){
@@ -1855,23 +2144,30 @@
 			x = x * pauseScale + 257
 			y = y * pauseScale - 328
 		}
-		if(104 <= y && y <= 575 && 465 <= x && x <= 465 + 110 * this.pauseOptions.length){
-			return Math.floor((x - 465) / 110)
+		switch(this.controller.game.calibrationState){
+			case "audioHelp":
+			case "videoHelp":
+			case "results":
+				if(554 - 90 * this.pauseOptions.length <= y && y <= 554 && 404 <= x && x <= 876){
+					return Math.floor((y - 554 + 90 * this.pauseOptions.length) / 90)
+				}
+				break
+			default:
+				if(104 <= y && y <= 575 && 465 <= x && x <= 465 + 110 * this.pauseOptions.length){
+					return Math.floor((x - 465) / 110)
+				}
+				break
 		}
 		return null
 	}
 	mouseIdle(){
 		var lastMouse = pageEvents.getMouse()
-		if(lastMouse && !this.cursorHidden){
+		if(lastMouse && !this.cursorHidden && !this.state.hasPointer){
 			if(this.getMS() >= this.lastMousemove + 2000){
-				this.cursor.style.top = lastMouse.clientY + "px"
-				this.cursor.style.left = lastMouse.clientX + "px"
-				this.cursor.style.pointerEvents = "auto"
+				this.canvas.style.cursor = "none"
 				this.cursorHidden = true
 			}else{
-				this.cursor.style.top = ""
-				this.cursor.style.left = ""
-				this.cursor.style.pointerEvents = ""
+				this.canvas.style.cursor = ""
 			}
 		}
 	}
@@ -1890,12 +2186,13 @@
 		this.pauseCache.clean()
 		this.branchCache.clean()
 		
+		versionDiv.classList.remove("version-hide")
+		loader.screen.parentNode.appendChild(versionDiv)
 		if(this.multiplayer !== 2){
 			if(this.touchEnabled){
 				pageEvents.remove(this.canvas, "touchstart")
 				pageEvents.remove(this.touchPauseBtn, "touchend")
 				this.gameDiv.classList.add("touch-results")
-				document.getElementById("version").classList.remove("version-hide")
 				this.touchDrumDiv.parentNode.removeChild(this.touchDrumDiv)
 				delete this.touchDrumDiv
 				delete this.touchDrumImg
@@ -1915,7 +2212,6 @@
 		pageEvents.mouseRemove(this)
 
 		delete this.pauseMenu
-		delete this.cursor
 		delete this.gameDiv
 		delete this.canvas
 		delete this.ctx

public/src/views/about.html

@@ -7,8 +7,8 @@
 			<div id="link-issues" class="taibtn stroke-sub link-btn" alt="Issues">
 				<a target="_blank">Issues</a>
 			</div>
-			<div id="link-email" class="taibtn stroke-sub link-btn" alt="taiko@bui.pm">
-				<a href="mailto:taiko@bui.pm">taiko@bui.pm</a>
+			<div id="link-email" class="taibtn stroke-sub link-btn">
+				<a></a>
 			</div>
 		</div>
 		<div class="view-end-button taibtn stroke-sub selected"></div>

public/src/views/game.html

@@ -11,5 +11,4 @@
 	<div id="touch-buttons">
 		<div id="touch-full-btn"></div><div id="touch-pause-btn"></div>
 	</div>
-	<div id="cursor"></div>
 </div>

public/src/views/settings.html

@@ -20,5 +20,15 @@
 				<div class="view-end-button taibtn stroke-sub selected"></div>
 			</div>
 		</div>
+		<div class="view-outer shadow-outer" id="settings-latency">
+			<div class="view">
+				<div class="view-title stroke-sub"></div>
+				<div class="view-content"></div>
+				<div class="left-buttons">
+					<div id="latency-default" class="taibtn stroke-sub"></div>
+				</div>
+				<div class="view-end-button taibtn stroke-sub"></div>
+			</div>
+		</div>
 	</div>
 </div>