hi_mpi_vpc_convert_color_to_yuv420

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

Converts the image format to YUV420SP or YVU420SP. This API is asynchronous.

Prototype

hi_s32 hi_mpi_vpc_convert_color_to_yuv420(hi_vpc_chn chn, const hi_vpc_pic_info *source_pic, hi_vpc_pic_info *dest_pic, hi_u32 *task_id, hi_s32 milli_sec)

Parameters

Parameter	Input/Output	Description
chn	Input	Channel ID for image processing. Atlas 350 Accelerator Card: The value range is [0, 256). The maximum number of channels is 256. Atlas A3 training product/Atlas A3 inference product: The value range is [0, 256). The maximum number of channels is 256. Atlas A2 training product/Atlas A2 inference product: The value range is [0, 256). The maximum number of channels is 256. Atlas 200I/500 A2 inference product: The value range is [0, 128). The maximum number of channels is 128. Atlas inference product: The value range is [0, 256). The maximum number of channels is 256.
source_pic	Input	Pointer to the source image information.
dest_pic	Input	Pointer to the destination image information. You must specify the width, height, width stride, height stride, buffer address, buffer size, and format of the output image. The width and height of the output image must be the same as those of the input image. Otherwise, an error is reported. If the width or height of the output image is set to 0, the VPC uses the width and height of the input image as those of the output image. In addition, the VPC calculates the width stride and height stride based on the alignment requirements. The alignment requirements vary depending on the image format. For details, see Restrictions on Image Formats, Width and Height Alignment, and Buffers. The width stride and height stride of the output image must meet the alignment requirements. The alignment requirements vary according to the image format. For details, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.
task_id	Output	Pointer to the task ID, which is used to identify a task.
milli_sec	Input	Timeout interval (ms). -1: blocking mode. 0: non-blocking mode. > 0: timeout interval (timeout mode). The timeout interval varies with the operating system. The deviation is generally within a time slice of an operating system. For example, if the time slice of an operating system is 4 ms and the value of milli_sec is set to 1, the actual timeout interval ranges from 1 ms to 5 ms. When the CPU load is high, the timeout interval may fluctuate.

Returns

0: success
Other values: failure. For details, see VPC Return Codes.

Restrictions

This API is compatible with the format conversion API of the old AI processor version. In the compatibility scenario, the input and output image formats are as follows. In the compatibility scenario, the output binary files are the same.
- Input image format: YUV420 semi-planar/YVU420 semi-planar/YUV422 semi-planar/YVU422 semi-planar/YUV444 packed /YUV444 semi-planar/YVU444 semi-planar
- Output formats: YUV420SP/YVU420SP
- In the preceding input and output image formats, the binary output of this API is different from that of the hi_mpi_vpc_convert_color API.

Requirements on the input resolution:

Model	Restriction
Atlas inference product	Input image resolution: [10 × 6, 4096 × 4096].
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	Input image resolution: [10 × 6, 4096 × 8192].

Model

Restriction

Atlas inference product

Input image resolution: [10 × 6, 4096 × 4096].

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

Input image resolution: [10 × 6, 4096 × 8192].

The input image format supports the following enumerated values of hi_pixel_format:

HI_PIXEL_FORMAT_YUV_SEMIPLANAR_420 = 1,       // YUV420SP NV12 8bit   
HI_PIXEL_FORMAT_YVU_SEMIPLANAR_420 = 2,       // YUV420SP NV21 8bit 
HI_PIXEL_FORMAT_YUV_SEMIPLANAR_422 = 3,       // YUV422SP 8bit
HI_PIXEL_FORMAT_YVU_SEMIPLANAR_422 = 4,       // YVU422SP 8bit
HI_PIXEL_FORMAT_YUV_SEMIPLANAR_444 = 5,       // YUV444SP 8bit
HI_PIXEL_FORMAT_YVU_SEMIPLANAR_444 = 6,       // YVU444SP 8bit
HI_PIXEL_FORMAT_YUYV_PACKED_422 = 7,          // YUV422Packed YUYV 8bit
HI_PIXEL_FORMAT_UYVY_PACKED_422 = 8,          // YUV422Packed UYVY 8bit
HI_PIXEL_FORMAT_YVYU_PACKED_422 = 9,          // YUV422Packed YVYU 8bit
HI_PIXEL_FORMAT_VYUY_PACKED_422 = 10,         // YUV422Packed VYUY 8bit
HI_PIXEL_FORMAT_YUV_PACKED_444 = 11,          // YUV444Packed 8bit
HI_PIXEL_FORMAT_RGB_888 = 12,                 // RGB888
HI_PIXEL_FORMAT_BGR_888 = 13,                 // BGR888
HI_PIXEL_FORMAT_ARGB_8888 = 14,               // ARGB8888
HI_PIXEL_FORMAT_ABGR_8888 = 15,               // ABGR8888
HI_PIXEL_FORMAT_RGBA_8888 = 16,               // RGBA8888
HI_PIXEL_FORMAT_BGRA_8888 = 17,               // BGRA8888
HI_PIXEL_FORMAT_YUV_SEMIPLANAR_440 = 1000,    // YUV440SP 8bit 
HI_PIXEL_FORMAT_YVU_SEMIPLANAR_440 = 1001,    // YVU440SP 8bit

The output image format supports the following enumerated values of hi_pixel_format. If other image formats are set, the API returns a failure message.
```
HI_PIXEL_FORMAT_YUV_SEMIPLANAR_420 = 1,       // YUV420SP NV12 8bit   
HI_PIXEL_FORMAT_YVU_SEMIPLANAR_420 = 2,       // YUV420SP NV21 8bit 
```
For details about the restrictions on the width and height alignment and buffer size of each image format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC