78 lines
2.0 KiB
Dart
78 lines
2.0 KiB
Dart
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class StallDetector {
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StallDetector({this.threshold = const Duration(seconds: 15)})
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: assert(threshold > Duration.zero);
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final Duration threshold;
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Duration? _lastPos;
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Duration? _lastBuffer;
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int? _lastBytes;
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Duration _lastAdvanceAt = Duration.zero;
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bool _fired = false;
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bool update({
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required Duration position,
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required Duration bufferedPosition,
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required int? bytesDownloaded,
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required bool isActivelyPlaying,
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required Duration now,
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}) {
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if (!isActivelyPlaying) {
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_lastPos = position;
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_lastBuffer = bufferedPosition;
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_lastBytes = bytesDownloaded;
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_lastAdvanceAt = now;
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return false;
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}
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if (_lastPos == null) {
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_lastPos = position;
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_lastBuffer = bufferedPosition;
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_lastBytes = bytesDownloaded;
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_lastAdvanceAt = now;
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return false;
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}
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final positionAdvanced = position != _lastPos;
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final bytesBecameAvailable = bytesDownloaded != null && _lastBytes == null;
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final hasComparableByteSamples =
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bytesDownloaded != null && _lastBytes != null;
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final bytesAdvanced =
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hasComparableByteSamples && bytesDownloaded != _lastBytes;
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final bufferAdvanced = bufferedPosition != _lastBuffer;
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final hasBufferedMedia =
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bufferedPosition - position > const Duration(seconds: 2);
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final transportAdvanced = bytesBecameAvailable ||
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(hasComparableByteSamples
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? bytesAdvanced
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: bufferAdvanced || hasBufferedMedia);
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final progressed = positionAdvanced || transportAdvanced;
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_lastPos = position;
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_lastBuffer = bufferedPosition;
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_lastBytes = bytesDownloaded;
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if (progressed) {
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_lastAdvanceAt = now;
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_fired = false;
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return false;
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}
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if (_fired) return false;
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if (now - _lastAdvanceAt >= threshold) {
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_fired = true;
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return true;
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}
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return false;
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}
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void reset() {
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_lastPos = null;
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_lastBuffer = null;
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_lastBytes = null;
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_lastAdvanceAt = Duration.zero;
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_fired = false;
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}
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}
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