hi_mpi_venc_start_chn

Applicability

Product	Supported
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	☓

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

hi_s32 hi_mpi_venc_start_chn(hi_venc_chn chn, const hi_venc_start_param *recv_param)

Parameters

Parameter	Input/Output	Description
chn	Input	Encoding channel ID. 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 the encoding channel ID 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 the encoding channel ID is [0, 256). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 256.
recv_param	Input	Pointer to the received image parameters, for specifying the number of frames to be received.

Parameter

Input/Output

Description

chn

Input

Encoding channel ID.

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 the encoding channel ID 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 the encoding channel ID is [0, 256). The JPEGE and VENC functions share the same channels, and the maximum number of channels is 256.

recv_param

Input

Pointer to the received image parameters, for specifying the number of frames to be received.

Returns

0: success
Other values: 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 again 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 images receiving and encoding only after this API call.

hi_mpi_venc_start_chn

Applicability

Description

Prototype

Parameters

Returns

Restrictions

See Also