vdec_get_pic_buf_size

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 buffer size required for image decoding.

This function is used in the following scenarios: calculating the size of the internal buffer required for video decoding (configure the related channel parameters during initialization); calculating the output buffer for image decoding.

Prototype

C Prototype

        
             hi_u32 hi_vdec_get_pic_buf_size(hi_payload_type type, hi_pic_buf_attr *buf_attr);

Python Function

        
             ret = acl.himpi.vdec_get_pic_buf_size(type, buf_attr)

Parameter Description

Parameter	Description
type	Int, decoded video type. Currently, HI_PT_H264, HI_PT_H265 and HI_PT_JPEG are supported. For details, see hi_payload_type.
buf_attr	Dict, image parameter dictionary. For details, see hi_pic_buf_attr.

Return Value Description

Return Value	Description
ret	Int, image size required for image storage. A non-zero value indicates the size of the image to be stored. For HI_PT_JPEG decoding (using JPEGD), if pixel_format is set to an unsupported format or HI_PIXEL_FORMAT_UNKNOWN, the value 0 is returned.

Restrictions

This API calculates the size of the output image buffer.

Reference

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

Parent topic: VDEC/JPEGD APIs