venc_compact_jpeg_tables

Product	Supported (√/x)
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas training products	x
Atlas inference products	√
Atlas 200I/500 A2 inference products	√

Sets whether to compress Huffman and QT tables.

C Prototype

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

Python Function

ret = acl.himpi.venc_compact_jpeg_tables(chn, table_type, enable)

Parameter	Description
chn	Int, encoding channel ID. Atlas inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256. Atlas A2 training products/Atlas A2 inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256. Among them, a maximum of 256 JPEGD decoding channels and 32 VDEC decoding channels are supported. Atlas 200I/500 A2 inference products: The value range of this parameter is [0, 128). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 128. Atlas A3 training products/Atlas A3 inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256. Among them, a maximum of 256 JPEGD decoding channels and 32 VDEC decoding channels are supported.
table_type	int, compression type. It can only be set to 0, indicating that both the Huffman table data and QT quantization table data are compressed.
enable	Int, whether to compress a file. Value 0 indicates no, and value 1 indicates yes.

Parameter

Description

chn

Int, encoding channel ID.

Atlas inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256.
Atlas A2 training products/Atlas A2 inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256. Among them, a maximum of 256 JPEGD decoding channels and 32 VDEC decoding channels are supported.
Atlas 200I/500 A2 inference products: The value range of this parameter is [0, 128). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 128.
Atlas A3 training products/Atlas A3 inference products: The value range of this parameter is [0, 256). The JPEGD and VDEC functions share the same channels, and the maximum number of channels is 256. Among them, a maximum of 256 JPEGD decoding channels and 32 VDEC decoding channels are supported.

table_type

int, compression type. It can only be set to 0, indicating that both the Huffman table data and QT quantization table data are compressed.

enable

Int, whether to compress a file. Value 0 indicates no, and value 1 indicates yes.

Return Value	Description
ret	Int, error code. 0: success. Other values: failures. For details, see VENC/JPEGE Return Codes.

Call this API after an encoding channel is created and before the channel is destroyed.

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

Parent topic: VENC/JPEGE APIs