Function: dvpp_png_predict_dec_size

Product	Supported
Ascend 950PR / Ascend 950DT	x
Atlas A3 training products / Atlas A3 inference products	√
Atlas A2 training products / Atlas A2 inference products	√
Atlas training products	√
Atlas inference products	√
Atlas 200I/500 A2 inference products	√

Predicts the output buffer allocation required for PNG decoding based on the memory of the input PNG image.

C Prototype

        
             aclError acldvppPngPredictDecSize(const void *data,uint32_t dataSize,acldvppPixelFormat outputPixelFormat,uint32_t *decSize)

Python Function

        
             dec_size ,ret = acl.media.dvpp_png_predict_dec_size(data, data_size, output_pixel_format)

Parameter	Description
data	Int, pointer address of the buffer location that stores the PNG image data.
data_size	Int, memory size, in bytes.
output_pixel_format	Int, format of the decoded output image: PIXEL_FORMAT_UNKNOWN: maximum buffer size calculated based on the PNG decoding output format. PIXEL_FORMAT_RGB_888 PIXEL_FORMAT_RGBA_8888

Parameter

Description

data

Int, pointer address of the buffer location that stores the PNG image data.

data_size

Int, memory size, in bytes.

output_pixel_format

Int, format of the decoded output image:

PIXEL_FORMAT_UNKNOWN: maximum buffer size calculated based on the PNG decoding output format.
PIXEL_FORMAT_RGB_888

Return Value	Description
dec_size	Int, output buffer size in bytes required for the decoded PNG image.
ret	Int, error code. 0 on success; else, failure.

For details about the API call sequence and examples, see PNGD.

Parent topic: PNGD