58 lines
1.7 KiB
Dart
58 lines
1.7 KiB
Dart
import 'dart:typed_data';
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/// SPS/PPS/I帧依赖关系管理器
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class FrameDependencyManager {
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Uint8List? _sps;
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Uint8List? _pps;
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final int windowSize = 10;
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final List<int> _iFrameSeqWindow = [];
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// 丢帧自愈相关
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int _dropCount = 0;
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final int dropThreshold = 10; // 可根据需要调整
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/// 重置依赖管理器（自愈）
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void reset() {
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_iFrameSeqWindow.clear();
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_dropCount = 0;
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}
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/// 更新SPS缓存
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void updateSps(Uint8List? sps) {
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_sps = sps;
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}
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/// 更新PPS缓存
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void updatePps(Uint8List? pps) {
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_pps = pps;
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}
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Uint8List? get sps => _sps;
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Uint8List? get pps => _pps;
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/// 判断是否有可用I帧
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bool get hasIFrame => _iFrameSeqWindow.isNotEmpty;
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int? get lastIFrameSeq => _iFrameSeqWindow.isNotEmpty ? _iFrameSeqWindow.last : null;
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int get dropCount => _dropCount;
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int get dropThresholdValue => dropThreshold;
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void updateIFrameSeq(int seq) {
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_iFrameSeqWindow.add(seq);
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if (_iFrameSeqWindow.length > windowSize) {
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_iFrameSeqWindow.removeAt(0);
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}
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_dropCount = 0; // I帧解码时重置丢帧计数
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// print('[FrameDependencyManager][调试] I帧解码成功，序号: $seq，当前I帧窗口: ${_iFrameSeqWindow.toString()}');
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}
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/// 判断指定I帧序号是否在滑动窗口内
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bool isIFrameDecoded(int? seq) {
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if (seq == null || !_iFrameSeqWindow.contains(seq)) {
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_dropCount++;
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// print('[FrameDependencyManager][调试] 当前I帧窗口: ${_iFrameSeqWindow.toString()}，待查找I帧序号: $seq');
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if (_dropCount >= dropThreshold) {
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print('[FrameDependencyManager][自愈] 连续丢帧$_dropCount次，自动reset依赖窗口');
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reset();
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}
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return false;
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}
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return true;
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}
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} |