acldvppPngDecodeAsync

Description

Decodes PNG images. This API is asynchronous.

Function	Input Format	Output Format
Set the output format to PIXEL_FORMAT_UNKNOWN. That is, the output image has the same format as the input image.	RGB/GRAY	RGB
Set the output format to PIXEL_FORMAT_UNKNOWN. That is, the output image has the same format as the input image.	RGBA/AGRAY	RGBA
Set the output format to PIXEL_FORMAT_RGB_888. That is, the input image is converted to a specified format for output.	RGB/RGBA/GRAY/AGRAY	RGB

Function

Input Format

Output Format

Set the output format to PIXEL_FORMAT_UNKNOWN.

That is, the output image has the same format as the input image.

RGB/GRAY

RGB

Set the output format to PIXEL_FORMAT_UNKNOWN.

That is, the output image has the same format as the input image.

RGBA/AGRAY

RGBA

Set the output format to PIXEL_FORMAT_RGB_888. That is, the input image is converted to a specified format for output.

RGB/RGBA/GRAY/AGRAY

RGB

Restrictions

This API is asynchronous. The API call delivers a task rather than executes a task. After this API is called, call the synchronization API (for example, aclrtSynchronizeStream) to ensure that the task is complete.

Prototype

aclError acldvppPngDecodeAsync(acldvppChannelDesc *channelDesc,

const void *data,

uint32_t size,

acldvppPicDesc *outputDesc,

aclrtStream stream)

Parameters

Parameter	Input/Output	Description
channelDesc	Input	Pointer to the channel description. Must be the same as the channelDesc argument passed to the acldvppCreateChannel call.
data	Input	Pointer to the input buffer address.
size	Input	Actual size of the input image, in bytes.
outputDesc	Input/Output	Pointer to the output image description. When outputDesc is used as an input, the user needs to: Call acldvppCreatePicDesc to create an image description. Call acldvppSetPicDesc series to set the output buffer address, buffer size, and image format. Call acldvppPngPredictDecSize to predict the output buffer size. Call acldvppPngGetImageInfo to obtain the original PNG image information (such as the width and height). For details about the requirements on the output image format and output buffer, see Functions and Restrictions. When outputDesc is used as an output, the user can obtain the decoding output from the buffer address.
stream	Input	Stream.

Returns