hi_mpi_venc_compact_jpeg_tables

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

Specifies whether to compress Huffman or QT tables.

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

After this API is called, compression is supported only when the Huffman or QT table has the same Y, Cb, and Cr components.

Prototype

hi_s32 hi_mpi_venc_compact_jpeg_tables(hi_venc_chn chn, hi_u32 table_type, hi_bool enable)

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.
table_type	Input	Compression type. Must be 0, indicating that both the Huffman and QT tables are compressed.
enable	Input	Compression enabled or not. 0: not enabled; 1: enabled

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.

table_type

Input

Compression type. Must be 0, indicating that both the Huffman and QT tables are compressed.

enable

Input

Compression enabled or not. 0: not enabled; 1: enabled

Returns

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

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