35 lines
905 B
Dart
35 lines
905 B
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 = 30;
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final List<int> _iFrameSeqWindow = [];
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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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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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}
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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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return seq != null && _iFrameSeqWindow.contains(seq);
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}
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} |