admin1
69 lines
1.5 KiB
Dart
69 lines
1.5 KiB
Dart
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class TimedSubtitle {
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final Duration start;
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final Duration end;
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final String text;
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const TimedSubtitle({
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required this.start,
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required this.end,
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required this.text,
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});
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}
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class EmbeddedSubtitleCues {
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final List<TimedSubtitle> _cues = [];
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bool get isEmpty => _cues.isEmpty;
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void add(double startSec, double endSec, List<String> lines) {
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final text = lines
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.map((s) => s.trim())
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.where((s) => s.isNotEmpty)
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.join('\n');
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if (text.isEmpty) return;
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final start = _toDuration(startSec);
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final end = _toDuration(endSec);
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if (end < start) return;
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final at = _lowerBound(start);
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for (var i = at; i < _cues.length && _cues[i].start == start; i++) {
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if (_cues[i].end == end && _cues[i].text == text) return;
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}
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_cues.insert(at, TimedSubtitle(start: start, end: end, text: text));
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}
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List<String> textAt(Duration position) {
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final out = <String>[];
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for (final cue in _cues) {
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if (position < cue.start) break;
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if (position <= cue.end) out.addAll(cue.text.split('\n'));
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}
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return out;
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}
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void clear() => _cues.clear();
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static Duration _toDuration(double seconds) =>
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Duration(milliseconds: (seconds * 1000).round());
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int _lowerBound(Duration start) {
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int lo = 0;
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int hi = _cues.length;
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while (lo < hi) {
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final mid = (lo + hi) >> 1;
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if (_cues[mid].start < start) {
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lo = mid + 1;
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} else {
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hi = mid;
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}
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}
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return lo;
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}
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}
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