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Add Machine Translated Subtitles to YouTube #609

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Add Machine Translated Subtitles to YouTube #609

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07032f2
POC for adding translated tracks to YouTube
IanDesuyo Jan 4, 2025
e8d6fad
Update language code and name formatting
IanDesuyo Jan 4, 2025
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34 changes: 30 additions & 4 deletions extension/src/pages/youtube-page.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
import { VideoData } from '@project/common';
import { trackFromDef } from './util';

const TLANG = 'ja';

declare global {
interface Window {
trustedTypes?: any;
Expand Down Expand Up @@ -37,6 +39,29 @@ const adaptYtTrack = (track: any) => {
});
};

const appendTranslatedTracks = (tracks: any, tlang: string) => {
const translatedTracks = [...tracks];

for (const track of tracks) {
// Ignore subtitles that are already in the target language
if (track.languageCode !== tlang) {
const translatedTrack = {
...track,
name: {
simpleText: `${track.name?.simpleText} >> ${tlang}`,
runs: track.name?.runs?.map((run: any) => ({ ...run, text: `${run.text} >> ${tlang}` })),
},
languageCode: tlang,
baseUrl: `${track.baseUrl}&tlang=${tlang}`, // YouTube API param for translation
};

translatedTracks.push(translatedTrack);
}
}

return translatedTracks;
};

document.addEventListener(
'asbplayer-get-synced-data',
async () => {
Expand Down Expand Up @@ -89,9 +114,10 @@ document.addEventListener(
}

response.basename = playerContext.videoDetails?.title || document.title;
response.subtitles = (playerContext?.captions?.playerCaptionsTracklistRenderer?.captionTracks || []).map(
adaptYtTrack
);
response.subtitles = appendTranslatedTracks(
playerContext?.captions?.playerCaptionsTracklistRenderer?.captionTracks || [],
TLANG
).map(adaptYtTrack);
} catch (error) {
if (error instanceof Error) {
response.error = error.message;
Expand Down Expand Up @@ -137,7 +163,7 @@ JSON.parse = function () {

if (typeof tracks === 'object' && Array.isArray(tracks) && typeof value?.videoDetails?.videoId === 'string') {
const videoId = value.videoDetails.videoId;
const subtitles = tracks.map(adaptYtTrack);
const subtitles = appendTranslatedTracks(tracks, TLANG).map(adaptYtTrack);
const basename = value.videoDetails?.title || document.title;
dataByVideoId[videoId] = {
subtitles,
Expand Down