Function: dvpp_vpc_resize_async

C Prototype	*aclError acldvppVpcResizeAsync(acldvppChannelDesc channelDesc, acldvppPicDesc inputDesc, acldvppPicDesc outputDesc, acldvppResizeConfig resizeConfig, aclrtStream stream)*
Python Function	ret = acl.media.dvpp_vpc_resize_async(dvpp_channel_desc, input_dvpp_pic_desc, output_dvpp_pic_desc, dvpp_resize_config, stream)
Function Usage	Resizes the input image to the output image size. This API is asynchronous.
Input Description	dvpp_channel_desc: int, pointer address of the channel description. It must be the same as the dvpp_channel_desc argument passed to the acl.media.dvpp_create_channel call. input_dvpp_pic_desc: int, pointer address of the input image information. Call acl.media.dvpp_create_pic_desc to create an image description. Call the acl.media.dvpp_set_pic_desc APIs to set image description parameters (such as the image format, width, and height). output_dvpp_pic_desc: int, pointer address of the output image information. When output_dvpp_pic_desc is used as an input, the user needs to: Call acl.media.dvpp_create_pic_desc to create an image description. Call the acl.dvpp.set_pic_desc APIs to set the image description (including the buffer address, buffer size, image format, and image resolution). dvpp_resize_config: int, pointer address of the image resizing configuration data. Call acl.media.dvpp_create_resize_config to create an image resizing configuration. stream: int, stream object.
Return Value	ret: int, error code. 0 indicates the success of task delivery. Other values indicate the failure of task delivery.

Restrictions

Version	Restrictions
Atlas 200/300/500 Inference Product Atlas Training Series Product	Input image size and format: When the input image resolution is in the range of [10 x 6, 4096 x 4096], the input image formats described in Restrictions on Image Formats, Width and Height Alignment, and Buffers are supported. When the width or height of the input image is in the range of (4096, 8192], the supported formats are as follows: The following enum values of acldvppPixelFormat are supported: PIXEL_FORMAT_YUV_SEMIPLANAR_420 = 1, // YUV420SP NV12 8bit PIXEL_FORMAT_YVU_SEMIPLANAR_420 = 2, // YUV420SP NV21 8bit If the width/height of the input image is not 2-pixel aligned, the VPC automatically rounds down the width/height to the nearest multiple of 2 pixels. For example, for a 15 x 15 input image, the VPC rounds down the image size to 14 x 14 before resizing the image. For details about the output image size and format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers. For details about the restrictions on the width and height alignment, buffer size, and image format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Version

Restrictions

Atlas 200/300/500 Inference Product

Atlas Training Series Product

Input image size and format:
- When the input image resolution is in the range of [10 x 6, 4096 x 4096], the input image formats described in Restrictions on Image Formats, Width and Height Alignment, and Buffers are supported.
- When the width or height of the input image is in the range of (4096, 8192], the supported formats are as follows:
  The following enum values of acldvppPixelFormat are supported:
```
PIXEL_FORMAT_YUV_SEMIPLANAR_420 = 1,       // YUV420SP NV12 8bit   
PIXEL_FORMAT_YVU_SEMIPLANAR_420 = 2,       // YUV420SP NV21 8bit 
```
- If the width/height of the input image is not 2-pixel aligned, the VPC automatically rounds down the width/height to the nearest multiple of 2 pixels. For example, for a 15 x 15 input image, the VPC rounds down the image size to 14 x 14 before resizing the image.
For details about the output image size and format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.
For details about the restrictions on the width and height alignment, buffer size, and image format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC