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Transcript: For clarity, use more verbose names and add comments

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This commit is contained in:
James Taylor 2020-09-24 14:28:01 -07:00
parent 97b092bf7a
commit c7c74624ed
2 changed files with 70 additions and 50 deletions
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24
youtube/static/js/common.js
View File

@ -1,32 +1,32 @@
Q = document.querySelector.bind(document); Q = document.querySelector.bind(document);
function text(msg) { return document.createTextNode(msg); } function text(msg) { return document.createTextNode(msg); }
function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); } function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); }
function toMS(s) { function toTimestamp(s) {
var s = Math.floor(s); var s = Math.floor(s);
var m = Math.floor(s/60); var s = s % 60; var m = Math.floor(s/60); var s = s % 60;
return `0${m}:`.slice(-3) + `0${s}`.slice(-2); return `0${m}:`.slice(-3) + `0${s}`.slice(-2);
} }
var cur_tt_idx = 0; var cur_track_idx = 0;
function getActiveTranscriptTrackIdx() { function getActiveTranscriptTrackIdx() {
let tts = Q("video").textTracks; let textTracks = Q("video").textTracks;
if (!tts.length) return; if (!textTracks.length) return;
for (let i=0; i < tts.length; i++) { for (let i=0; i < textTracks.length; i++) {
if (tts[i].mode == "showing") { if (textTracks[i].mode == "showing") {
cur_tt_idx = i; cur_track_idx = i;
return cur_tt_idx; return cur_track_idx;
} }
} }
return cur_tt_idx; return cur_track_idx;
} }
function getActiveTranscriptTrack() { return Q("video").textTracks[getActiveTranscriptTrackIdx()]; } function getActiveTranscriptTrack() { return Q("video").textTracks[getActiveTranscriptTrackIdx()]; }
function getDefaultTranscriptTrackIdx() { function getDefaultTranscriptTrackIdx() {
let tts = Q("video").textTracks; let textTracks = Q("video").textTracks;
return tts.length - 1; return textTracks.length - 1;
} }
window.addEventListener('DOMContentLoaded', function() { window.addEventListener('DOMContentLoaded', function() {
cur_tt_idx = getDefaultTranscriptTrackIdx(); cur_track_idx = getDefaultTranscriptTrackIdx();
}); });

96
youtube/static/js/transcript-table.js
View File

@ -1,28 +1,38 @@
var details_tt, select_tt, table_tt; var details_tt, select_tt, table_tt;
function renderCues() { function renderCues() {
var tt = Q("video").textTracks[select_tt.selectedIndex]; var selectedTrack = Q("video").textTracks[select_tt.selectedIndex];
let cuesL = [...tt.cues]; let cuesList = [...selectedTrack.cues];
var tt_type = cuesL[0].text.startsWith(" \n"); var is_automatic = cuesList[0].text.startsWith(" \n");
// Firefox ignores cues starting with a blank line containing a space
// Automatic captions contain such a blank line in the first cue
let ff_bug = false; let ff_bug = false;
if (!cuesL[0].text.length) { ff_bug = true; tt_type = true }; if (!cuesList[0].text.length) { ff_bug = true; is_automatic = true };
let rows; let rows;
function forEachCue(cb) { function forEachCue(callback) {
for (let i=0; i < cuesL.length; i++) { for (let i=0; i < cuesList.length; i++) {
let txt, startTime = tt.cues[i].startTime; let txt, startTime = selectedTrack.cues[i].startTime;
if (tt_type) { if (is_automatic) {
// Automatic captions repeat content. The new segment is displayed
// on the bottom row; the old one is displayed on the top row.
// So grab the bottom row only. Skip every other cue because the bottom
// row is empty.
if (i % 2) continue; if (i % 2) continue;
if (ff_bug && !tt.cues[i].text.length) txt = tt.cues[i+1].text; if (ff_bug && !selectedTrack.cues[i].text.length) {
else txt = tt.cues[i].text.split('\n')[1].replace(/<[\d:.]*?><c>(.*?)<\/c>/g, "$1"); txt = selectedTrack.cues[i+1].text;
} else {
txt = selectedTrack.cues[i].text.split('\n')[1].replace(/<[\d:.]*?><c>(.*?)<\/c>/g, "$1");
}
} else { } else {
txt = tt.cues[i].text; txt = selectedTrack.cues[i].text;
} }
cb(startTime, txt); callback(startTime, txt);
} }
} }
function createA(startTime, txt, title=null) { function createTimestampLink(startTime, txt, title=null) {
a = document.createElement("a"); a = document.createElement("a");
a.appendChild(text(txt)); a.appendChild(text(txt));
a.href = "javascript:;"; // TODO: replace this with ?t parameter a.href = "javascript:;"; // TODO: replace this with ?t parameter
@ -34,14 +44,14 @@ function renderCues() {
} }
clearNode(table_tt); clearNode(table_tt);
console.log("render cues..", tt.cues.length); console.log("render cues..", selectedTrack.cues.length);
if (Q("input#transcript-use-table").checked) { if (Q("input#transcript-use-table").checked) {
forEachCue((startTime, txt) => { forEachCue((startTime, txt) => {
let tr, td, a; let tr, td, a;
tr = document.createElement("tr"); tr = document.createElement("tr");
td = document.createElement("td") td = document.createElement("td")
td.appendChild(createA(startTime, toMS(startTime))); td.appendChild(createTimestampLink(startTime, toTimestamp(startTime)));
tr.appendChild(td); tr.appendChild(td);
td = document.createElement("td") td = document.createElement("td")
@ -58,7 +68,7 @@ function renderCues() {
var idx = txt.indexOf(" ", 1); var idx = txt.indexOf(" ", 1);
var [firstWord, rest] = [txt.slice(0, idx), txt.slice(idx)]; var [firstWord, rest] = [txt.slice(0, idx), txt.slice(idx)];
span.appendChild(createA(startTime, firstWord, toMS(startTime))); span.appendChild(createTimestampLink(startTime, firstWord, toTimestamp(startTime)));
if (rest) span.appendChild(text(rest + " ")); if (rest) span.appendChild(text(rest + " "));
table_tt.appendChild(span); table_tt.appendChild(span);
}); });
@ -68,40 +78,50 @@ function renderCues() {
var lastActiveRow = null; var lastActiveRow = null;
function colorCurRow(e) { function colorCurRow(e) {
// console.log("cuechange:", e); // console.log("cuechange:", e);
var idxC = cuesL.findIndex((c) => c == tt.activeCues[0]); var activeCueIdx = cuesList.findIndex((c) => c == selectedTrack.activeCues[0]);
var idxT = tt_type ? Math.floor(idxC / 2) : idxC; var activeRowIdx = is_automatic ? Math.floor(activeCueIdx / 2) : activeCueIdx;
if (lastActiveRow) lastActiveRow.style.backgroundColor = ""; if (lastActiveRow) lastActiveRow.style.backgroundColor = "";
if (idxT < 0) return; if (activeRowIdx < 0) return;
var row = rows[idxT]; var row = rows[activeRowIdx];
row.style.backgroundColor = "#0cc12e42"; row.style.backgroundColor = "#0cc12e42";
lastActiveRow = row; lastActiveRow = row;
} }
colorCurRow(); colorCurRow();
tt.addEventListener("cuechange", colorCurRow); selectedTrack.addEventListener("cuechange", colorCurRow);
} }
function loadCues() { function loadCues() {
let tts = Q("video").textTracks; let textTracks = Q("video").textTracks;
let tt = tts[select_tt.selectedIndex]; let selectedTrack = textTracks[select_tt.selectedIndex];
let dst_mode = "hidden";
for (let ttI of tts) {
if (ttI.mode === "showing") dst_mode = "showing";
if (ttI !== tt) ttI.mode = "disabled";
}
if (tt.mode == "disabled") tt.mode = dst_mode;
var iC = setInterval(() => { // See https://developer.mozilla.org/en-US/docs/Web/API/TextTrack/mode
if (tt.cues && tt.cues.length) { // This code will (I think) make sure that the selected track's cues
clearInterval(iC); // are loaded even if the track subtitles aren't on (showing). Setting it
// to hidden will load them.
let selected_track_target_mode = "hidden";
for (let track of textTracks) {
// Want to avoid unshowing selected track if it's showing
if (track.mode === "showing") selected_track_target_mode = "showing";
if (track !== selectedTrack) track.mode = "disabled";
}
if (selectedTrack.mode == "disabled") {
selectedTrack.mode = selected_track_target_mode;
}
var intervalID = setInterval(() => {
if (selectedTrack.cues && selectedTrack.cues.length) {
clearInterval(intervalID);
renderCues(); renderCues();
} }
}, 100); }, 100);
} }
window.addEventListener('DOMContentLoaded', function() { window.addEventListener('DOMContentLoaded', function() {
let tts = Q("video").textTracks; let textTracks = Q("video").textTracks;
if (!tts.length) return; if (!textTracks.length) return;
details_tt = Q("details#transcript-details"); details_tt = Q("details#transcript-details");
details_tt.addEventListener("toggle", () => { details_tt.addEventListener("toggle", () => {
@ -115,15 +135,15 @@ window.addEventListener('DOMContentLoaded', function() {
table_tt = Q("table#transcript-table"); table_tt = Q("table#transcript-table");
table_tt.appendChild(text("loading..")); table_tt.appendChild(text("loading.."));
tts.addEventListener("change", (e) => { textTracks.addEventListener("change", (e) => {
// console.log(e); // console.log(e);
var idx = getActiveTranscriptTrackIdx(); // sadly not provided by 'e' var idx = getActiveTranscriptTrackIdx(); // sadly not provided by 'e'
if (tts[idx].mode == "showing") { if (textTracks[idx].mode == "showing") {
select_tt.selectedIndex = idx; select_tt.selectedIndex = idx;
loadCues(); loadCues();
} }
else if (details_tt.open && tts[idx].mode == "disabled") { else if (details_tt.open && textTracks[idx].mode == "disabled") {
tts[idx].mode = "hidden"; // so we still receive 'oncuechange' textTracks[idx].mode = "hidden"; // so we still receive 'oncuechange'
} }
}) })