hi_mpi_sys_ctl_epoll

Product	Supported
Atlas A3 training products / Atlas A3 inference products	√
Atlas A2 training products / Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	√
Atlas inference products	√
Atlas training products	x

Adds, deletes, or modifies the corresponding media data processing channel for the media data processing epoll instance.

hi_mpi_sys_create_epoll, hi_mpi_sys_ctl_epoll, hi_mpi_sys_wait_epoll, and hi_mpi_sys_close_epoll must be used together to operate the input and output data of the media data processing channel by using the epoll programming model. The VPC function does not support this API.

hi_s32 hi_mpi_sys_ctl_epoll(hi_s32 epoll_fd, hi_s32 operation, hi_s32 fd, hi_dvpp_epoll_event *event)

Parameter	Input/Output	Description
epoll_fd	Input	File descriptor of an epoll instance. Ensure that the file descriptor has been created by using hi_mpi_sys_create_epoll.
operation	Input	Operation type (addition, deletion, or modification). For details, see hi_dvpp_epoll_ctl_op.
fd	Input	File descriptor of the media data processing channel. To obtain a file descriptor in the VENC scenario, call hi_mpi_venc_get_fd. To obtain a file descriptor in the VDEC scenario, call hi_mpi_vdec_get_fd.
event	Input	Pointer to the epoll event information. This parameter describes the event type of the corresponding media data processing channel and the associated user data. This parameter is unused in the deletion operation and can be set to NULL.