hi_mpi_sys_ctl_epoll

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product / Atlas A3 inference product	√
Atlas A2 training product / Atlas A2 inference product	√
Atlas 200I/500 A2 inference product	√
Atlas inference product	√
Atlas training product	☓

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

The hi_mpi_sys_create_epoll, hi_mpi_sys_ctl_epoll, hi_mpi_sys_wait_epoll, and hi_mpi_sys_close_epoll APIs must be used together to operate the input/output data of the media data processing channel 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. In the VENC scenario, you can call the hi_mpi_venc_get_fd API to obtain the file descriptor in advance. 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.