Frontload the chat time display calculation

The chat time display calculation is also done in a worker to prevent stalling. Since we do the calculation on load, the stalling that is prevented would happen when loading the page.

thrimbletrimmer/edit.html

@@ -8,6 +8,7 @@
 
 		<script src="scripts/hls.min.js"></script>
 		<script src="scripts/luxon.min.js"></script>
+		<script src="scripts/common-worker.js"></script>
 		<script src="scripts/common.js"></script>
 		<script src="scripts/edit.js"></script>
 		<script src="scripts/keyboard-shortcuts.js"></script>

thrimbletrimmer/index.html

@@ -8,6 +8,7 @@
 
 		<script src="scripts/hls.min.js"></script>
 		<script src="scripts/luxon.min.js"></script>
+		<script src="scripts/common-worker.js"></script>
 		<script src="scripts/common.js"></script>
 		<script src="scripts/stream.js"></script>
 		<script src="scripts/keyboard-shortcuts.js"></script>

thrimbletrimmer/scripts/chat-load.js

@@ -0,0 +1,49 @@
+self.importScripts("luxon.min.js", "common-worker.js");
+
+var DateTime = luxon.DateTime;
+luxon.Settings.defaultZone = "utc";
+
+self.onmessage = async (event) => {
+	const chatLoadData = event.data;
+
+	const segmentMetadata = chatLoadData.segmentMetadata;
+	for (const segmentData of segmentMetadata) {
+		segmentData.rawStart = DateTime.fromMillis(segmentData.rawStart);
+		segmentData.rawEnd = DateTime.fromMillis(segmentData.rawEnd);
+	}
+
+	const fetchURL = `/${chatLoadData.stream}/chat.json?start=${chatLoadData.start}&end=${chatLoadData.end}`;
+	const chatResponse = await fetch(fetchURL);
+	if (!chatResponse.ok) {
+		return;
+	}
+	const chatRawData = await chatResponse.json();
+
+	const chatData = [];
+	for (const chatLine of chatRawData) {
+		if (
+			chatLine.command !== "PRIVMSG" &&
+			chatLine.command !== "CLEARMSG" &&
+			chatLine.command !== "CLEARCHAT" &&
+			chatLine.command !== "USERNOTICE"
+		) {
+			continue;
+		}
+		const when = DateTime.fromSeconds(chatLine.time);
+		const displayWhen = videoHumanTimeFromDateTimeWithFragments(segmentMetadata, when);
+		// Here, we just push each line successively into the list. This assumes data is provided to us in chronological order.
+		chatData.push({ message: chatLine, when: when.toMillis(), displayWhen: displayWhen });
+	}
+	self.postMessage(chatData);
+};
+
+function videoHumanTimeFromDateTimeWithFragments(fragmentMetadata, dateTime) {
+	for (const segmentData of fragmentMetadata) {
+		if (dateTime >= segmentData.rawStart && dateTime <= segmentData.rawEnd) {
+			const playerTime =
+				segmentData.playerStart + dateTime.diff(segmentData.rawStart).as("seconds");
+			return videoHumanTimeFromVideoPlayerTime(playerTime);
+		}
+	}
+	return null;
+}

thrimbletrimmer/scripts/common-worker.js

@@ -0,0 +1,21 @@
+function videoHumanTimeFromVideoPlayerTime(videoPlayerTime) {
+	const hours = Math.floor(videoPlayerTime / 3600);
+	let minutes = Math.floor((videoPlayerTime % 3600) / 60);
+	let seconds = Math.floor(videoPlayerTime % 60);
+	let milliseconds = Math.floor((videoPlayerTime * 1000) % 1000);
+
+	while (minutes.toString().length < 2) {
+		minutes = `0${minutes}`;
+	}
+	while (seconds.toString().length < 2) {
+		seconds = `0${seconds}`;
+	}
+	while (milliseconds.toString().length < 3) {
+		milliseconds = `0${milliseconds}`;
+	}
+
+	if (hours > 0) {
+		return `${hours}:${minutes}:${seconds}.${milliseconds}`;
+	}
+	return `${minutes}:${seconds}.${milliseconds}`;
+}

thrimbletrimmer/scripts/common.js

@@ -12,6 +12,7 @@ var globalSetUpControls = false;
 var globalSeekTimer = null;
 
 var globalChatData = [];
+var globalLoadChatWorker = null;
 
 Hls.DefaultConfig.maxBufferHole = 600;
 
@@ -25,6 +26,8 @@ function commonPageSetup() {
 			"Your browser doesn't support MediaSource extensions. Video playback and editing won't work."
 		);
 	}
+
+	globalLoadChatWorker = new Worker("scripts/chat-load.js");
 }
 
 function addError(errorText) {
@@ -50,6 +53,7 @@ async function loadVideoPlayer(playlistURL) {
 
 	videoElement.addEventListener("loadedmetadata", (_event) => {
 		setUpVideoControls();
+		sendChatLogLoadData();
 	});
 
 	videoElement.addEventListener("loadeddata", (_event) => {
@@ -419,12 +423,12 @@ function dateTimeFromVideoPlayerTime(videoPlayerTime) {
 }
 
 function videoPlayerTimeFromDateTime(dateTime) {
-	const segmentList = getSegmentList();
+	const segmentTimes = getSegmentTimes();
-	for (const segment of segmentList) {
+	for (const segmentData of segmentTimes) {
-		const segmentStart = DateTime.fromISO(segment.rawProgramDateTime);
+		const segmentStart = segmentData.rawStart;
-		const segmentEnd = segmentStart.plus({ seconds: segment.duration });
+		const segmentEnd = segmentData.rawEnd;
 		if (dateTime >= segmentStart && dateTime <= segmentEnd) {
-			return segment.start + dateTime.diff(segmentStart).as("seconds");
+			return segmentData.playerStart + dateTime.diff(segmentStart).as("seconds");
 		}
 	}
 	return null;
@@ -478,6 +482,17 @@ function hasSegmentList() {
 	return false;
 }
 
+function getSegmentTimes() {
+	const segmentList = getSegmentList();
+	const segmentTimes = [];
+	for (const segment of segmentList) {
+		const segmentStart = DateTime.fromISO(segment.rawProgramDateTime);
+		const segmentEnd = segmentStart.plus({ seconds: segment.duration });
+		segmentTimes.push({ rawStart: segmentStart, rawEnd: segmentEnd, playerStart: segment.start });
+	}
+	return segmentTimes;
+}
+
 function downloadFrame() {
 	const videoElement = document.getElementById("video");
 	const dateTime = dateTimeFromVideoPlayerTime(videoElement.currentTime);
@@ -500,27 +515,32 @@ function triggerDownload(url, filename) {
 	document.body.removeChild(link);
 }
 
-async function getChatLog(startWubloaderTime, endWubloaderTime) {
+function sendChatLogLoadData() {
-	globalChatData = [];
+	const startTime = globalStartTimeString;
-	const url = `/${globalStreamName}/chat.json?start=${startWubloaderTime}&end=${endWubloaderTime}`;
+	const endTime = globalEndTimeString;
-	const response = await fetch(url);
+	if (!startTime || !endTime) {
-	if (!response.ok) {
 		return;
 	}
-	const chatLogData = await response.json();
+	const segmentMetadata = getSegmentTimes();
-	for (const chatLine of chatLogData) {
+	for (const segmentData of segmentMetadata) {
-		if (
+		segmentData.rawStart = segmentData.rawStart.toMillis();
-			chatLine.command !== "PRIVMSG" &&
+		segmentData.rawEnd = segmentData.rawEnd.toMillis();
-			chatLine.command !== "CLEARMSG" &&
+	}
-			chatLine.command !== "CLEARCHAT" &&
+
-			chatLine.command !== "USERNOTICE"
+	const message = {
-		) {
+		stream: globalStreamName,
-			continue;
+		start: startTime,
-		}
+		end: endTime,
-		const when = DateTime.fromSeconds(chatLine.time);
+		segmentMetadata: segmentMetadata,
-		// Here, we just push each line successively into the list. This assumes data is provided to us in chronological order.
+	};
-		globalChatData.push({ message: chatLine, when: when });
+	globalLoadChatWorker.postMessage(message);
+}
+
+function updateChatDataFromWorkerResponse(chatData) {
+	for (const chatLine of chatData) {
+		chatLine.when = DateTime.fromMillis(chatLine.when);
 	}
+	globalChatData = chatData;
 }
 
 function renderChatMessage(chatMessageData) {
@@ -531,7 +551,7 @@ function renderChatMessage(chatMessageData) {
 
 	const sendTimeElement = document.createElement("div");
 	sendTimeElement.classList.add("chat-replay-message-time");
-	sendTimeElement.innerText = videoHumanTimeFromDateTime(chatMessageData.when);
+	sendTimeElement.innerText = chatMessageData.displayWhen;
 
 	const senderNameElement = createMessageSenderElement(chatMessageData);
 
@@ -579,7 +599,7 @@ function renderSystemMessages(chatMessageData) {
 
 	const sendTimeElement = document.createElement("div");
 	sendTimeElement.classList.add("chat-replay-message-time");
-	sendTimeElement.innerText = videoHumanTimeFromDateTime(chatMessageData.when);
+	sendTimeElement.innerText = chatMessageData.displayWhen;
 
 	const systemTextElement = document.createElement("div");
 	systemTextElement.classList.add("chat-replay-message-text");

thrimbletrimmer/scripts/edit.js

@@ -7,6 +7,10 @@ const CHAPTER_MARKER_DELIMITER_PARTIAL = "==========";
 
 window.addEventListener("DOMContentLoaded", async (event) => {
 	commonPageSetup();
+	globalLoadChatWorker.onmessage = (event) => {
+		updateChatDataFromWorkerResponse(event.data);
+		renderChatLog();
+	};
 
 	const timeUpdateForm = document.getElementById("stream-time-settings");
 	timeUpdateForm.addEventListener("submit", async (event) => {
@@ -338,20 +342,6 @@ window.addEventListener("DOMContentLoaded", async (event) => {
 	document.getElementById("google-auth-sign-out").addEventListener("click", (_event) => {
 		googleSignOut();
 	});
-
-	await loadEditorChatData();
-	if (globalChatData) {
-		if (hasSegmentList()) {
-			renderChatLog();
-		} else {
-			const videoPlayer = document.getElementById("video");
-			const initialChatLogRender = (_event) => {
-				renderChatLog();
-				videoPlayer.removeEventListener("loadedmetadata", initialChatLogRender);
-			};
-			videoPlayer.addEventListener("loadedmetadata", initialChatLogRender);
-		}
-	}
 });
 
 async function loadVideoInfo() {
@@ -1540,10 +1530,6 @@ async function rangeDataUpdated() {
 		}
 	}
 	updateDownloadLink();
-
-	await getChatLog(globalStartTimeString, globalEndTimeString);
-	document.getElementById("chat-replay").innerHTML = "";
-	renderChatLog();
 }
 
 function setCurrentRangeStartToVideoTime() {
@@ -1591,13 +1577,6 @@ function changeEnableChaptersHandler() {
 	}
 }
 
-async function loadEditorChatData() {
-	if (!globalStartTimeString || !globalEndTimeString) {
-		return [];
-	}
-	return getChatLog(globalStartTimeString, globalEndTimeString);
-}
-
 function renderChatLog() {
 	const chatReplayParent = document.getElementById("chat-replay");
 	chatReplayParent.innerHTML = "";

thrimbletrimmer/scripts/stream.js

@@ -8,6 +8,10 @@ var globalChatPreviousRenderTime = null;
 
 window.addEventListener("DOMContentLoaded", async (event) => {
 	commonPageSetup();
+	globalLoadChatWorker.onmessage = (event) => {
+		updateChatDataFromWorkerResponse(event.data);
+		initialChatRender();
+	};
 
 	const queryParams = new URLSearchParams(window.location.search);
 	if (queryParams.has("start")) {
@@ -124,8 +128,6 @@ async function updateTimeSettings() {
 		queryParts.push(`end=${wubloaderTimeFromDateTime(endTime)}`);
 	}
 	document.getElementById("stream-time-link").href = `?${queryParts.join("&")}`;
-
-	await getStreamChatLog();
 }
 
 function generateDownloadURL(startTime, endTime, downloadType, allowHoles, quality) {
@@ -230,15 +232,6 @@ function convertEnteredTimes() {
 	}
 }
 
-async function getStreamChatLog() {
-	const startTime = getStartTime();
-	const endTime = getEndTime();
-	if (!startTime || !endTime) {
-		return;
-	}
-	return getChatLog(wubloaderTimeFromDateTime(startTime), wubloaderTimeFromDateTime(endTime));
-}
-
 function initialChatRender() {
 	if (!globalChatData || globalChatData.length === 0) {
 		return;
@@ -261,7 +254,7 @@ function initialChatRender() {
 }
 
 function updateChatRender() {
-	if (!globalChatData || globalChatData === 0) {
+	if (!globalChatData || globalChatData.length === 0) {
 		return;
 	}
 	if (!hasSegmentList()) {