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-rw-r--r--youtube/static/js/common.js24
-rw-r--r--youtube/static/js/transcript-table.js94
2 files changed, 69 insertions, 49 deletions
diff --git a/youtube/static/js/common.js b/youtube/static/js/common.js
index 4c7ee51..8f27a64 100644
--- a/youtube/static/js/common.js
+++ b/youtube/static/js/common.js
@@ -1,32 +1,32 @@
Q = document.querySelector.bind(document);
function text(msg) { return document.createTextNode(msg); }
function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); }
-function toMS(s) {
+function toTimestamp(s) {
var s = Math.floor(s);
var m = Math.floor(s/60); var s = s % 60;
return `0${m}:`.slice(-3) + `0${s}`.slice(-2);
}
-var cur_tt_idx = 0;
+var cur_track_idx = 0;
function getActiveTranscriptTrackIdx() {
- let tts = Q("video").textTracks;
- if (!tts.length) return;
- for (let i=0; i < tts.length; i++) {
- if (tts[i].mode == "showing") {
- cur_tt_idx = i;
- return cur_tt_idx;
+ let textTracks = Q("video").textTracks;
+ if (!textTracks.length) return;
+ for (let i=0; i < textTracks.length; i++) {
+ if (textTracks[i].mode == "showing") {
+ cur_track_idx = i;
+ return cur_track_idx;
}
}
- return cur_tt_idx;
+ return cur_track_idx;
}
function getActiveTranscriptTrack() { return Q("video").textTracks[getActiveTranscriptTrackIdx()]; }
function getDefaultTranscriptTrackIdx() {
- let tts = Q("video").textTracks;
- return tts.length - 1;
+ let textTracks = Q("video").textTracks;
+ return textTracks.length - 1;
}
window.addEventListener('DOMContentLoaded', function() {
- cur_tt_idx = getDefaultTranscriptTrackIdx();
+ cur_track_idx = getDefaultTranscriptTrackIdx();
});
diff --git a/youtube/static/js/transcript-table.js b/youtube/static/js/transcript-table.js
index 26d2948..3f1f210 100644
--- a/youtube/static/js/transcript-table.js
+++ b/youtube/static/js/transcript-table.js
@@ -1,28 +1,38 @@
var details_tt, select_tt, table_tt;
function renderCues() {
- var tt = Q("video").textTracks[select_tt.selectedIndex];
- let cuesL = [...tt.cues];
- var tt_type = cuesL[0].text.startsWith(" \n");
+ var selectedTrack = Q("video").textTracks[select_tt.selectedIndex];
+ let cuesList = [...selectedTrack.cues];
+ 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;
- if (!cuesL[0].text.length) { ff_bug = true; tt_type = true };
+ if (!cuesList[0].text.length) { ff_bug = true; is_automatic = true };
let rows;
- function forEachCue(cb) {
- for (let i=0; i < cuesL.length; i++) {
- let txt, startTime = tt.cues[i].startTime;
- if (tt_type) {
+ function forEachCue(callback) {
+ for (let i=0; i < cuesList.length; i++) {
+ let txt, startTime = selectedTrack.cues[i].startTime;
+ 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 (ff_bug && !tt.cues[i].text.length) txt = tt.cues[i+1].text;
- else txt = tt.cues[i].text.split('\n')[1].replace(/<[\d:.]*?><c>(.*?)<\/c>/g, "$1");
+ if (ff_bug && !selectedTrack.cues[i].text.length) {
+ txt = selectedTrack.cues[i+1].text;
+ } else {
+ txt = selectedTrack.cues[i].text.split('\n')[1].replace(/<[\d:.]*?><c>(.*?)<\/c>/g, "$1");
+ }
} 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.appendChild(text(txt));
a.href = "javascript:;"; // TODO: replace this with ?t parameter
@@ -34,14 +44,14 @@ function renderCues() {
}
clearNode(table_tt);
- console.log("render cues..", tt.cues.length);
+ console.log("render cues..", selectedTrack.cues.length);
if (Q("input#transcript-use-table").checked) {
forEachCue((startTime, txt) => {
let tr, td, a;
tr = document.createElement("tr");
td = document.createElement("td")
- td.appendChild(createA(startTime, toMS(startTime)));
+ td.appendChild(createTimestampLink(startTime, toTimestamp(startTime)));
tr.appendChild(td);
td = document.createElement("td")
@@ -58,7 +68,7 @@ function renderCues() {
var idx = txt.indexOf(" ", 1);
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 + " "));
table_tt.appendChild(span);
});
@@ -68,40 +78,50 @@ function renderCues() {
var lastActiveRow = null;
function colorCurRow(e) {
// console.log("cuechange:", e);
- var idxC = cuesL.findIndex((c) => c == tt.activeCues[0]);
- var idxT = tt_type ? Math.floor(idxC / 2) : idxC;
+ var activeCueIdx = cuesList.findIndex((c) => c == selectedTrack.activeCues[0]);
+ var activeRowIdx = is_automatic ? Math.floor(activeCueIdx / 2) : activeCueIdx;
if (lastActiveRow) lastActiveRow.style.backgroundColor = "";
- if (idxT < 0) return;
- var row = rows[idxT];
+ if (activeRowIdx < 0) return;
+ var row = rows[activeRowIdx];
row.style.backgroundColor = "#0cc12e42";
lastActiveRow = row;
}
colorCurRow();
- tt.addEventListener("cuechange", colorCurRow);
+ selectedTrack.addEventListener("cuechange", colorCurRow);
}
function loadCues() {
- let tts = Q("video").textTracks;
- let tt = tts[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";
+ let textTracks = Q("video").textTracks;
+ let selectedTrack = textTracks[select_tt.selectedIndex];
+
+ // See https://developer.mozilla.org/en-US/docs/Web/API/TextTrack/mode
+ // This code will (I think) make sure that the selected track's cues
+ // 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;
}
- if (tt.mode == "disabled") tt.mode = dst_mode;
- var iC = setInterval(() => {
- if (tt.cues && tt.cues.length) {
- clearInterval(iC);
+ var intervalID = setInterval(() => {
+ if (selectedTrack.cues && selectedTrack.cues.length) {
+ clearInterval(intervalID);
renderCues();
}
}, 100);
}
window.addEventListener('DOMContentLoaded', function() {
- let tts = Q("video").textTracks;
- if (!tts.length) return;
+ let textTracks = Q("video").textTracks;
+ if (!textTracks.length) return;
details_tt = Q("details#transcript-details");
details_tt.addEventListener("toggle", () => {
@@ -115,15 +135,15 @@ window.addEventListener('DOMContentLoaded', function() {
table_tt = Q("table#transcript-table");
table_tt.appendChild(text("loading.."));
- tts.addEventListener("change", (e) => {
+ textTracks.addEventListener("change", (e) => {
// console.log(e);
var idx = getActiveTranscriptTrackIdx(); // sadly not provided by 'e'
- if (tts[idx].mode == "showing") {
+ if (textTracks[idx].mode == "showing") {
select_tt.selectedIndex = idx;
loadCues();
}
- else if (details_tt.open && tts[idx].mode == "disabled") {
- tts[idx].mode = "hidden"; // so we still receive 'oncuechange'
+ else if (details_tt.open && textTracks[idx].mode == "disabled") {
+ textTracks[idx].mode = "hidden"; // so we still receive 'oncuechange'
}
})
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 03:38:17 +0000