Initial commit

2026-07-14 11:11:36 +08:00
commit 656499cf94
604 changed files with 119518 additions and 0 deletions
@@ -0,0 +1,77 @@
+
+
+class StallDetector {
+  StallDetector({this.threshold = const Duration(seconds: 15)})
+    : assert(threshold > Duration.zero);
+
+
+  final Duration threshold;
+
+  Duration? _lastPos;
+  Duration? _lastBuffer;
+  int? _lastBytes;
+  Duration _lastAdvanceAt = Duration.zero;
+  bool _fired = false;
+
+
+  bool update({
+    required Duration position,
+    required Duration bufferedPosition,
+    required int? bytesDownloaded,
+    required bool isActivelyPlaying,
+    required Duration now,
+  }) {
+    if (!isActivelyPlaying) {
+      _lastPos = position;
+      _lastBuffer = bufferedPosition;
+      _lastBytes = bytesDownloaded;
+      _lastAdvanceAt = now;
+      return false;
+    }
+    if (_lastPos == null) {
+      _lastPos = position;
+      _lastBuffer = bufferedPosition;
+      _lastBytes = bytesDownloaded;
+      _lastAdvanceAt = now;
+      return false;
+    }
+
+    final positionAdvanced = position != _lastPos;
+    final bytesBecameAvailable = bytesDownloaded != null && _lastBytes == null;
+    final hasComparableByteSamples =
+        bytesDownloaded != null && _lastBytes != null;
+    final bytesAdvanced =
+        hasComparableByteSamples && bytesDownloaded != _lastBytes;
+    final bufferAdvanced = bufferedPosition != _lastBuffer;
+    final hasBufferedMedia =
+        bufferedPosition - position > const Duration(seconds: 2);
+    final transportAdvanced = bytesBecameAvailable ||
+        (hasComparableByteSamples
+            ? bytesAdvanced
+            : bufferAdvanced || hasBufferedMedia);
+    final progressed = positionAdvanced || transportAdvanced;
+
+    _lastPos = position;
+    _lastBuffer = bufferedPosition;
+    _lastBytes = bytesDownloaded;
+    if (progressed) {
+      _lastAdvanceAt = now;
+      _fired = false;
+      return false;
+    }
+    if (_fired) return false;
+    if (now - _lastAdvanceAt >= threshold) {
+      _fired = true;
+      return true;
+    }
+    return false;
+  }
+
+  void reset() {
+    _lastPos = null;
+    _lastBuffer = null;
+    _lastBytes = null;
+    _lastAdvanceAt = Duration.zero;
+    _fired = false;
+  }
+}