hi_mpi_vpss_get_chn_fd

Applicability

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	☓

Function Description

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. The value range is [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.

The value range is [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.