acldvppVpcPyrDownAsync

Applicable Products

Product	Supported
Ascend 950PR / Ascend 950DT	x
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

Function

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 information. Call acldvppCreatePicDesc to create an image description. Call 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 information. When outputDesc is used as an input, the user needs to: Call acldvppCreatePicDesc to create an image description. Call 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. For details, see aclrtStream.

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 alignment requirements for PIXEL_FORMAT_YUV_400 images, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC