hi_mpi_venc_get_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 descriptor corresponding to an encoding channel.

When the process exits, the file descriptor is automatically closed to clean up associated allocations.

Prototype

hi_s32 hi_mpi_venc_get_fd(hi_venc_chn chn)

Parameters

Parameter	Input/Output	Description
chn	Input	Encoding channel ID. Ascend 950PR / Ascend 950DT : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256. Atlas A3 training products / Atlas A3 inference products : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256. Atlas A2 training products / Atlas A2 inference products : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256. Atlas 200I/500 A2 inference products : The value range of this parameter is [0, 128). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 128. Atlas inference products : The value range of this parameter is [0, 256). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 256.

Parameter

Input/Output

Description

chn

Input

Encoding channel ID.

Ascend 950PR / Ascend 950DT : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256.

Atlas A3 training products / Atlas A3 inference products : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256.

Atlas A2 training products / Atlas A2 inference products : The value range of the encoding channel ID is [0, 256). The maximum number of JPEGE channels is 256.

Atlas 200I/500 A2 inference products : The value range of this parameter is [0, 128). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 128.

Atlas inference products : The value range of this parameter is [0, 256). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 256.

Returns

0 or positive value: valid
Negative value: invalid

Reference

For details about the API call sequence and example, see JPEGE and VENC.

Parent topic: Video Encoder (VENC) and JPEG Encoder (JPEGE)