hi_mpi_venc_set_jpeg_param

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

Sets the advanced quantization table (QT) parameters of a JPEG encoding channel.

This API must be called after an encoding channel is created and before the channel is destroyed.

Before this API call, you can tweak the current parameters obtained by using hi_mpi_venc_get_jpeg_param. When the qfactor parameter in the hi_venc_jpeg_param structure is set to 0xFFFFFFFF, the Cb component (blue) and Cr component (red) in the QT must be the same.

Prototype

hi_s32 hi_mpi_venc_set_jpeg_param(hi_venc_chn chn, const hi_venc_jpeg_param *jpeg_param)

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.
jpeg_param	Input	Pointer to the advanced parameters of a JPEG encoding channel.

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.

jpeg_param

Input

Pointer to the advanced parameters of a JPEG encoding channel.

Returns

0: success
Other values: failure. For details, see VENC/JPEGE Return Codes.

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