fix timelatency not take effect and avoid buffer is liner avoid cycle

srt/PacketSendQueue.hpp

@@ -0,0 +1,29 @@
+#ifndef ZLMEDIAKIT_SRT_PACKET_SEND_QUEUE_H
+#define ZLMEDIAKIT_SRT_PACKET_SEND_QUEUE_H
+#include "Packet.hpp"
+#include <algorithm>
+#include <list>
+#include <memory>
+#include <set>
+#include <tuple>
+#include <utility>
+namespace SRT {
+class PacketSendQueue {
+public:
+    using Ptr = std::shared_ptr<PacketSendQueue>;
+    using LostPair = std::pair<uint32_t, uint32_t>;
+    PacketSendQueue(uint32_t max_size, uint32_t lantency);
+    ~PacketSendQueue() = default;
+    bool drop(uint32_t num);
+    bool inputPacket(DataPacket::Ptr pkt);
+    std::list<DataPacket::Ptr> findPacketBySeq(uint32_t start,uint32_t end);
+private:
+    uint32_t timeLantency();
+private:
+    std::list<DataPacket::Ptr> _pkt_cache;
+    uint32_t _pkt_cap;
+    uint32_t _pkt_lantency;
+};
+} // namespace SRT
+
+#endif // ZLMEDIAKIT_SRT_PACKET_SEND_QUEUE_H