hi_mpi_vpss_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 device file handle corresponding to a VPSS channel.

Prototype

hi_s32 hi_mpi_vpss_get_chn_fd(hi_vpss_grp grp, hi_vpss_chn chn)

Parameters

Parameter	Input/Output	Description
grp	Input	VPSS group ID. Value range: [0, 264). If the 3DNR function is enabled by setting the hi_vpss_grp_attr.nr_en parameter of the hi_mpi_vpss_create_grp API, the value range of the VPSS group ID is [256, 268).
chn	Input	VPSS channel ID. Value range: [0, 2)

Parameter

Input/Output

Description

grp

Input

VPSS group ID.

Value range: [0, 264). If the 3DNR function is enabled by setting the hi_vpss_grp_attr.nr_en parameter of the hi_mpi_vpss_create_grp API, the value range of the VPSS group ID is [256, 268).

chn

Input

VPSS channel ID.

Value range: [0, 2)

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 and Processing (Camera Scenario) and Video Decoding, Processing, and Display (NVR Scenario).

Parent topic: VPSS Video Processing Functions