venc_start_chn

Applicability

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product / Atlas A3 inference product	√
Atlas A2 training product / Atlas A2 inference product	√
Atlas training product	x
Atlas inference product	√
Atlas 200I/500 A2 inference product	√

Description

Enables an encoding channel to start receiving source images. The encoding channel automatically stops receiving images when the specified receive limit is reached.

Prototype

C Prototype

        
             hi_s32 hi_mpi_venc_start_chn (hi_venc_chn chn, const hi_venc_start_param *recv_param)

Python Function

        
             ret = acl.himpi.venc_start_chn(chn, recv_param)

Parameters

Parameter	Description
chn	Int, decoding channel ID.
recv_param	Dict, dictionary of image receiving parameters. It is used to specify the number of frames to be received. For details, see hi_venc_start_param.

Return Value

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

Restrictions

Ensure that a channel has been created. Otherwise, the error code HI_ERR_VENC_UNEXIST is returned.
The value -1 indicates that an unspecified number of frames will be received.
For a channel already in the image receiving progress, if this API is called to specify its frame receive limit, an error code is returned indicating that this request is illegal.
If a channel has started to receive images, you can call this API again without specifying the number of frames to be received before the channel stops receiving images.
The encoder starts encoding images only after its channel has started receiving images.

Reference

For details about the API call sequence, see JPEGE and VENC.

Parent topic: VENC/JPEGE APIs