png_get_image_info

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 width, height, and source format of the input PNG image, the width stride and height stride of the output image, as well as the required buffer size based on the input stream.

Prototype

C Prototype

        
             hi_s32 hi_mpi_png_get_image_info(const hi_img_stream *png_stream, hi_img_info *img_info)

Python Function

        
             img_info, ret = acl.himpi.png_get_image_info(png_stream)

Parameter Description

Parameter	Description
png_stream	Dict, input stream information. For details, see hi_img_stream. For the Atlas inference products in standard form, when this API is called on the host, the configured addr must be a buffer address on the host.

Parameter

Description

png_stream

Dict, input stream information. For details, see hi_img_stream.

For the Atlas inference products in standard form, when this API is called on the host, the configured addr must be a buffer address on the host.

Return Value Description

Return Value	Description
img_info	Dict, image information dictionary. For details, see hi_img_info.
ret	Int, error code. 0: success. Other values: failures. For details, see PNGD Return Codes.

Return Value

Description

img_info

Dict, image information dictionary. For details, see hi_img_info.

ret

Int, error code.

0: success.
Other values: failures. For details, see PNGD Return Codes.

Restrictions

This API is provided to calculate the size of the buffer occupied by the decoded output image. Currently, only PNG images can be parsed. The obtained width_stride and height_stride must be rounded up to the nearest multiples of 128 and 16, respectively.

Parent topic: PNGD APIs