Initial commit

2026-07-14 11:11:36 +08:00
commit 656499cf94
604 changed files with 119518 additions and 0 deletions
@@ -0,0 +1,68 @@
+
+class TimedSubtitle {
+  final Duration start;
+  final Duration end;
+  final String text;
+
+  const TimedSubtitle({
+    required this.start,
+    required this.end,
+    required this.text,
+  });
+}
+
+
+class EmbeddedSubtitleCues {
+  final List<TimedSubtitle> _cues = [];
+
+  bool get isEmpty => _cues.isEmpty;
+
+
+  void add(double startSec, double endSec, List<String> lines) {
+    final text = lines
+        .map((s) => s.trim())
+        .where((s) => s.isNotEmpty)
+        .join('\n');
+    if (text.isEmpty) return;
+
+    final start = _toDuration(startSec);
+    final end = _toDuration(endSec);
+    if (end < start) return;
+
+    final at = _lowerBound(start);
+    for (var i = at; i < _cues.length && _cues[i].start == start; i++) {
+      if (_cues[i].end == end && _cues[i].text == text) return;
+    }
+    _cues.insert(at, TimedSubtitle(start: start, end: end, text: text));
+  }
+
+
+  List<String> textAt(Duration position) {
+    final out = <String>[];
+    for (final cue in _cues) {
+      if (position < cue.start) break;
+      if (position <= cue.end) out.addAll(cue.text.split('\n'));
+    }
+    return out;
+  }
+
+  void clear() => _cues.clear();
+
+  static Duration _toDuration(double seconds) =>
+      Duration(milliseconds: (seconds * 1000).round());
+
+
+  int _lowerBound(Duration start) {
+    int lo = 0;
+    int hi = _cues.length;
+    while (lo < hi) {
+      final mid = (lo + hi) >> 1;
+      if (_cues[mid].start < start) {
+        lo = mid + 1;
+      } else {
+        hi = mid;
+      }
+    }
+    return lo;
+  }
+}