vdec_get_chn_param

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	√

Obtains the parameters of a channel before modifying channel parameters.

C Prototype

        
             hi_s32 hi_mpi_vdec_get_chn_param(hi_vdec_chn chn, hi_vdec_chn_param *chn_param);

Python Function

        
             chn_param, ret = acl.himpi.vdec_get_chn_param(chn)

Parameter	Description
chn	Int, decoding 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, decoding 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
chn_param	Dict, dictionary of decoding channel parameters. For details, see hi_vdec_chn_param.
ret	Int, error code. 0: success. Other values: failures. For details, see Common Return Codes.

Return Value

Description

chn_param

Dict, dictionary of decoding channel parameters. For details, see hi_vdec_chn_param.

ret

Int, error code.

Ensure that a channel has been created. Otherwise, the error code HI_ERR_VDEC_UNEXIST is returned.

For the API call sequence, see JPEGE and VENC.

Parent topic: VDEC/JPEGD APIs