【NetEq】NackTracker 走读

重传列表的最大限制是500个包，大约10秒钟

  // A limit for the size of the NACK list.static const size_t kNackListSizeLimit = 500;  // 10 seconds for 20 ms frame// packets.

允许设置一个小于max_nack_list_size的值

  // Set a maximum for the size of the NACK list. If the last received packet// has sequence number of N, then NACK list will not contai