ff_network_sleep_interruptible 1529 libavformat/http.c         err = ff_network_sleep_interruptible(1000U*1000*reconnect_delay, &h->interrupt_callback);
ff_network_sleep_interruptible  108 libavformat/network.h int ff_network_sleep_interruptible(int64_t timeout, AVIOInterruptCB *int_cb);