venc_get_jpeg_huffman_param

Applicability

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	√

Function Usage

Obtains the advanced JPEGE Huffman parameters of an encoding channel.

Prototype

C Prototype

hi_s32 hi_mpi_venc_get_jpeg_huffman_param(hi_venc_chn chn, hi_venc_jpeg_huffman_param *jpeg_huffman_data);

Python Function

jpeg_huffman_data, ret = acl.himpi.venc_get_jpeg_huffman_param(chn)

Parameter Description

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.

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.

Return Value Description

Return Value	Description
jpeg_huffman_data	Dict, dictionary of advanced Huffman parameters. For details, see hi_venc_jpeg_huffman_param.
ret	Int, error code. 0: success. Other values: failures. For details, see VENC/JPEGE Return Codes.

Return Value

Description

jpeg_huffman_data

Dict, dictionary of advanced Huffman parameters. For details, see hi_venc_jpeg_huffman_param.

ret

Int, error code.

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

Restrictions

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

If acl.himpi.venc_set_jpeg_huffman_param has not been called to set the advanced Huffman coding parameters, the default Huffman coding parameters are returned.

Parent topic: VENC/JPEGE APIs