feat:增加Android下提取P帧nalu逻辑;增加长时间找不到I帧时的reset逻辑

lib/frame_dependency_manager.dart

@@ -4,9 +4,19 @@ import 'dart:typed_data';
 class FrameDependencyManager {
   Uint8List? _sps;
   Uint8List? _pps;
-  final int windowSize = 30;
+  final int windowSize = 10;
   final List<int> _iFrameSeqWindow = [];
 
+  // 丢帧自愈相关
+  int _dropCount = 0;
+  final int dropThreshold = 10; // 可根据需要调整
+
+  /// 重置依赖管理器（自愈）
+  void reset() {
+    _iFrameSeqWindow.clear();
+    _dropCount = 0;
+  }
+
   /// 更新SPS缓存
   void updateSps(Uint8List? sps) {
     _sps = sps;
@@ -21,15 +31,28 @@ class FrameDependencyManager {
   /// 判断是否有可用I帧
   bool get hasIFrame => _iFrameSeqWindow.isNotEmpty;
   int? get lastIFrameSeq => _iFrameSeqWindow.isNotEmpty ? _iFrameSeqWindow.last : null;
+  int get dropCount => _dropCount;
+  int get dropThresholdValue => dropThreshold;
   void updateIFrameSeq(int seq) {
     _iFrameSeqWindow.add(seq);
     if (_iFrameSeqWindow.length > windowSize) {
       _iFrameSeqWindow.removeAt(0);
     }
+    _dropCount = 0; // I帧解码时重置丢帧计数
+    // print('[FrameDependencyManager][调试] I帧解码成功，序号: $seq，当前I帧窗口: ${_iFrameSeqWindow.toString()}');
   }
 
   /// 判断指定I帧序号是否在滑动窗口内
   bool isIFrameDecoded(int? seq) {
-    return seq != null && _iFrameSeqWindow.contains(seq);
+    if (seq == null || !_iFrameSeqWindow.contains(seq)) {
+      _dropCount++;
+      // print('[FrameDependencyManager][调试] 当前I帧窗口: ${_iFrameSeqWindow.toString()}，待查找I帧序号: $seq');
+      if (_dropCount >= dropThreshold) {
+        print('[FrameDependencyManager][自愈] 连续丢帧$_dropCount次，自动reset依赖窗口');
+        reset();
+      }
+      return false;
+    }
+    return true;
   }
 } 

lib/nalu_utils.dart

@@ -67,4 +67,15 @@ class NaluUtils {
     }
     return -1;
   }
+
+  /// 提取所有指定type的NALU并拼接返回
+  static List<int> filterNalusByType(List<int> frameData, int type) {
+    final nalus = splitNalus(frameData);
+    final filtered = nalus.where((nalu) => nalu.type == type).toList();
+    final result = <int>[];
+    for (final nalu in filtered) {
+      result.addAll(nalu.data);
+    }
+    return result;
+  }
 } 

lib/video_decode_plugin.dart

@@ -236,10 +236,11 @@ class VideoDecodePlugin {
     // P帧依赖链完整性校验（提前）
     if (frameType == 1) {
       if (!_depManager.isIFrameDecoded(refIFrameSeq)) {
-        print(
-            '[丢帧] P帧依赖的I帧未解码，丢弃 frameSeq=$frameSeq, refIFrameSeq=$refIFrameSeq');
+        print('[丢帧] P帧依赖的I帧未解码，丢弃 frameSeq=$frameSeq, refIFrameSeq=$refIFrameSeq, dropCount=${_depManager.dropCount}, threshold=${_depManager.dropThresholdValue}');
         return;
       }
+      // 仅推送type=1的NALU，提升平台一致性
+      frameData = NaluUtils.filterNalusByType(frameData, 1);
     }
     await _decodeFrame(
       frameData: Uint8List.fromList(frameData),
@@ -261,21 +262,12 @@ class VideoDecodePlugin {
   }) async {
     // 仅P帧做AnnexB起始码检测和修正
     if (frameType == 1) {
-      // 分割NALU并只保留type=1的NALU
-      final nalus = NaluUtils.splitNalus(frameData);
-      final pNalus = nalus.where((nalu) => nalu.type == 1).toList();
-      if (pNalus.isEmpty) {
+      // 仅推送type=1的NALU，提升平台一致性
+      frameData = NaluUtils.filterNalusByType(frameData, 1);
+      if (frameData.isEmpty) {
         print('[VideoDecodePlugin][警告] iOS端P帧未找到type=1的NALU，已丢弃');
         return;
       }
-      // 拼接所有type=1的NALU
-      final sendData = <int>[];
-      for (final nalu in pNalus) {
-        sendData.addAll(nalu.data);
-      }
-      // print(
-      //     '[VideoDecodePlugin][调试] iOS端P帧仅推送type=1 NALU, count=${pNalus.length}, 总长度=${sendData.length}');
-      frameData = sendData;
       int startIndex = -1;
       for (int i = 0; i < frameData.length - 3; i++) {
         if (frameData[i] == 0x00 &&