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// ==UserScript==
// @name Auto-Live-TL YouTube Client
// @namespace https://example.com/
// @version 1.0
// @description Auto Translate Live Subtitles
// @author pinapelz
// @match https://www.youtube.com/*
// @grant none
// @run-at document-idle
// ==/UserScript==
(function () {
"use strict";
const PANEL_ID = "altl-subtitle-panel";
const SUBTITLE_TEXT_ID = "altl-subtitle-text";
const FOOTER_TEXT_ID = "altl-footer-text";
const EVENTS_URL = "http://127.0.0.1:5000/events";
let eventSource = null;
let isConnected = false;
let lastError = null;
let reconnectTimer = null;
const MAX_SUBTITLE_LINES = 3;
const recentLines = [];
function getPrimary() {
return document.querySelector("#columns #primary");
}
function getPlayerNode(primary) {
return (
primary?.querySelector("#player") ||
primary?.querySelector("ytd-player") ||
primary?.querySelector("#movie_player")?.closest("#player") ||
primary?.querySelector("#movie_player") ||
null
);
}
function getTitleAnchor(primary) {
return (
primary?.querySelector("ytd-watch-metadata") ||
primary?.querySelector("#title h1")?.closest("ytd-watch-metadata") ||
primary?.querySelector("#below ytd-watch-metadata") ||
primary?.querySelector("#below")?.firstElementChild ||
null
);
}
function ensurePanel() {
let panel = document.getElementById(PANEL_ID);
if (!panel) {
panel = document.createElement("div");
panel.id = PANEL_ID;
const subtitleText = document.createElement("div");
subtitleText.id = SUBTITLE_TEXT_ID;
subtitleText.textContent = "This is a sample subtitle.";
const footerText = document.createElement("div");
footerText.id = FOOTER_TEXT_ID;
footerText.textContent = "Machine Translated - no translation should be taken as authoritative or quoted verbatim";
footerText.style.marginTop = "8px";
footerText.style.fontSize = "12px";
footerText.style.opacity = "0.7";
footerText.style.textAlign = "center";
panel.appendChild(subtitleText);
panel.appendChild(footerText);
panel.style.display = "block";
panel.style.boxSizing = "border-box";
panel.style.width = "100%";
panel.style.margin = "8px 0 12px";
panel.style.padding = "10px 14px";
panel.style.borderRadius = "10px";
panel.style.background = "rgba(255,255,255,0.04)";
panel.style.border = "1px solid rgba(255,255,255,0.12)";
panel.style.color = "var(--yt-spec-text-primary, #f1f1f1)";
panel.style.fontSize = "16px";
panel.style.lineHeight = "1.45";
panel.style.fontWeight = "500";
panel.style.textAlign = "center";
panel.style.whiteSpace = "pre-wrap";
panel.style.wordBreak = "break-word";
}
return panel;
}
function getSubtitleNode(panel) {
return panel?.querySelector(`#${SUBTITLE_TEXT_ID}`) || null;
}
function setSubtitleText(panel, text) {
const node = getSubtitleNode(panel);
if (node) node.textContent = text;
}
function renderSubtitleHistory(panel) {
const node = getSubtitleNode(panel);
if (!node) return;
node.textContent = "";
recentLines.forEach((line, index) => {
const row = document.createElement("div");
row.textContent = line;
const opacity = Math.max(0.35, 1 - index * 0.15);
row.style.opacity = String(opacity);
if (index > 0) row.style.filter = "grayscale(1)";
node.appendChild(row);
});
}
function updateSubtitleHistory(panel, text) {
if (!text) return;
if (recentLines.length > 0 && recentLines[0] === text) {
renderSubtitleHistory(panel);
return;
}
recentLines.unshift(text);
if (recentLines.length > MAX_SUBTITLE_LINES) {
recentLines.splice(MAX_SUBTITLE_LINES);
}
renderSubtitleHistory(panel);
}
function safePlaceBefore(targetNode, nodeToPlace) {
if (!targetNode || !targetNode.parentNode || !targetNode.isConnected) return false;
const parent = targetNode.parentNode;
if (nodeToPlace.parentNode !== parent || nodeToPlace.nextSibling !== targetNode) {
parent.insertBefore(nodeToPlace, targetNode);
}
return true;
}
function safePlaceAfter(targetNode, nodeToPlace) {
if (!targetNode || !targetNode.parentNode || !targetNode.isConnected) return false;
const parent = targetNode.parentNode;
const desiredNext = targetNode.nextSibling;
if (nodeToPlace.parentNode !== parent || nodeToPlace.previousSibling !== targetNode) {
parent.insertBefore(nodeToPlace, desiredNext);
}
return true;
}
function connectEventSource(panel) {
if (eventSource) {
eventSource.close();
eventSource = null;
}
setSubtitleText(panel, "Connecting to local subtitle server...");
const source = new EventSource(EVENTS_URL);
eventSource = source;
source.addEventListener("subtitle", (event) => {
try {
const data = JSON.parse(event.data || "{}");
updateSubtitleHistory(panel, data.text || "");
} catch (err) {
lastError = err;
console.warn("Auto-Live-TL: failed to parse subtitle event", err);
}
});
source.onopen = () => {
isConnected = true;
if (recentLines.length > 0) {
renderSubtitleHistory(panel);
} else {
setSubtitleText(panel, "Connected. Waiting for subtitles...");
}
};
source.onerror = () => {
isConnected = false;
setSubtitleText(panel, "Connection lost. Reconnecting...");
if (eventSource) {
eventSource.close();
eventSource = null;
}
if (!reconnectTimer) {
reconnectTimer = setTimeout(() => {
reconnectTimer = null;
connectEventSource(panel);
}, 2000);
}
};
}
function startListeningIfNeeded(panel) {
if (isConnected || eventSource) return;
if (!location.pathname.startsWith("/watch")) return;
connectEventSource(panel);
}
function injectSubtitlePanel() {
if (!location.pathname.startsWith("/watch")) return false;
const primary = getPrimary();
if (!primary) return false;
const panel = ensurePanel();
startListeningIfNeeded(panel);
const titleAnchor = getTitleAnchor(primary);
if (safePlaceBefore(titleAnchor, panel)) return true;
const playerNode = getPlayerNode(primary);
if (safePlaceAfter(playerNode, panel)) return true;
return false;
}
injectSubtitlePanel();
const observer = new MutationObserver(() => {
injectSubtitlePanel();
});
observer.observe(document.documentElement, {
childList: true,
subtree: true,
});
window.addEventListener("yt-navigate-finish", injectSubtitlePanel);
})();
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