acldvppVpcPyrDownAsync

Applicability

Product	Supported
Atlas 350 Accelerator Card	☓
Atlas A3 training product / Atlas A3 inference product	☓
Atlas A2 training product / Atlas A2 inference product	☓
Atlas 200I/500 A2 inference product	☓
Atlas inference product	√
Atlas training product	☓

Function 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. The value must be the same as that of channelDesc specified when the acldvppCreateChannel API is called to create a channel.
inputDesc	Input	Pointer to the input image description. Call the acldvppCreatePicDesc API to create the 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 description. When outputDesc is used as an input, the user needs to: Call the acldvppCreatePicDesc API to create the 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 scaling configuration parameter. This parameter is reserved.
stream	Input	Stream. For details about the type definition, see aclrtStream.

Returns

If the return value is 0, the task is successfully delivered. If the return value is not 0, the task fails to be delivered. 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 of the PIXEL_FORMAT_YUV_400 image format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC