hi_mpi_vi_get_chn_fd

Applicable Products

Product	Supported
Ascend 950PR / Ascend 950DT	☓
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	☓

Function

Obtains the file descriptor of a VI channel.

Prototype

hi_s32 hi_mpi_vi_get_chn_fd(hi_vi_pipe vi_pipe, hi_vi_chn vi_chn)

Parameters

Parameter	Input/Output	Description
vi_pipe	Input	Pipe ID. Value range: [0, 12)
vi_chn	Input	VI channel ID. Value range: [0, 1)

Parameter

Input/Output

Description

vi_pipe

Input

Pipe ID.

Value range: [0, 12)

vi_chn

Input

VI channel ID.

Value range: [0, 1)

Returns

If the value is greater than or equal to 0, the API is successfully called and the corresponding handle is returned. Otherwise, the API fails to be called.

Reference

For the API call sequence, see Video Data Obtaining.

Parent topic: VI