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import { fixLineBreaks } from './vttparser';
import type { CaptionScreen, Row } from './cea-608-parser';
import { generateCueId } from './webvtt-parser';
import { addCueToTrack } from './texttrack-utils';
const WHITESPACE_CHAR = /\s/;
export interface CuesInterface {
newCue(
track: TextTrack | null,
startTime: number,
endTime: number,
captionScreen: CaptionScreen
): VTTCue[];
}
const Cues: CuesInterface = {
newCue(
track: TextTrack | null,
startTime: number,
endTime: number,
captionScreen: CaptionScreen
): VTTCue[] {
const result: VTTCue[] = [];
let row: Row;
// the type data states this is VTTCue, but it can potentially be a TextTrackCue on old browsers
let cue: VTTCue;
let indenting: boolean;
let indent: number;
let text: string;
const Cue = (self.VTTCue || self.TextTrackCue) as any;
for (let r = 0; r < captionScreen.rows.length; r++) {
row = captionScreen.rows[r];
indenting = true;
indent = 0;
text = '';
if (!row.isEmpty()) {
for (let c = 0; c < row.chars.length; c++) {
if (WHITESPACE_CHAR.test(row.chars[c].uchar) && indenting) {
indent++;
} else {
text += row.chars[c].uchar;
indenting = false;
}
}
// To be used for cleaning-up orphaned roll-up captions
row.cueStartTime = startTime;
// Give a slight bump to the endTime if it's equal to startTime to avoid a SyntaxError in IE
if (startTime === endTime) {
endTime += 0.0001;
}
if (indent >= 16) {
indent--;
} else {
indent++;
}
const cueText = fixLineBreaks(text.trim());
const id = generateCueId(startTime, endTime, cueText);
// If this cue already exists in the track do not push it
if (!track?.cues?.getCueById(id)) {
cue = new Cue(startTime, endTime, cueText);
cue.id = id;
cue.line = r + 1;
cue.align = 'left';
// Clamp the position between 10 and 80 percent (CEA-608 PAC indent code)
// https://dvcs.w3.org/hg/text-tracks/raw-file/default/608toVTT/608toVTT.html#positioning-in-cea-608
// Firefox throws an exception and captions break with out of bounds 0-100 values
cue.position = 10 + Math.min(80, Math.floor((indent * 8) / 32) * 10);
result.push(cue);
}
}
}
if (track && result.length) {
// Sort bottom cues in reverse order so that they render in line order when overlapping in Chrome
result.sort((cueA, cueB) => {
if (cueA.line === 'auto' || cueB.line === 'auto') {
return 0;
}
if (cueA.line > 8 && cueB.line > 8) {
return cueB.line - cueA.line;
}
return cueA.line - cueB.line;
});
result.forEach((cue) => addCueToTrack(track, cue));
}
return result;
},
};
export default Cues;