acldvppVpcPyrDownAsync

Applicability

Product	Supported
Atlas A3 training products/Atlas A3 inference products	x
Atlas A2 training products/Atlas A2 inference products	x
Atlas 200I/500 A2 inference products	x
Atlas inference products	√
Atlas training products	x

Description

Performs pyramid resizing to resize the output image to half the original size. This API is asynchronous.

Prototype

aclError acldvppVpcPyrDownAsync(acldvppChannelDesc *channelDesc,
acldvppPicDesc *inputDesc,
acldvppPicDesc *outputDesc,
void *reserve,
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.
inputDesc	Input	Pointer to the input image description. Call acldvppCreatePicDesc to create an image description. Call the acldvppSetPicDesc series to set the image description (including the buffer address, buffer size, image format, and image resolution).
outputDesc	Input/Output	Pointer to the output image description. When outputDesc is an input, the user needs to: Call acldvppCreatePicDesc to create an image description. Call the acldvppSetPicDesc series to set the image description (including the buffer address, buffer size, image format, and image resolution).
reserve	Input	Pointer to the pyramid configuration parameter. This parameter is reserved.
stream	Input	Stream.

Returns

0 on successful task delivery; else, failure. For details, see aclError.

Restrictions

Input image
- Input image resolution: [20 × 12, 2048 × 2048]
- Input image format: PIXEL_FORMAT_YUV_400
Output image
- Output image resolution: input image resolution/2
- Format: PIXEL_FORMAT_YUV_400
For details about the image alignment requirements for PIXEL_FORMAT_YUV_400 images, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC