acl.himpi.vpc_convert_color_to_yuv420

C 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);**
Python Function	task_id, ret = acl.himpi.vpc_convert_color_to_yuv420(chn, source_pic, dest_pic, milli_sec)
Function Usage	Converts the image format to YUV420 Semi-Planar or YVU420 Semi-Planar. This API is asynchronous. The Atlas 200/300/500 Inference Product does not support this API in the current version. The Atlas Training Series Product does not support this API in the current version.
Input Description	chn: int, image processing channel ID. source_pic: original image information. For details, see hi_vpc_pic_info. For details about related restrictions, see Restrictions. dest_pic: destination image information. For details, see hi_vpc_pic_info. 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, VPC uses the width and height of the input image as the width and height of the output image respectively. In addition, VPC calculates the width stride and height stride based on the alignment requirements, which vary with 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, which vary with the image format. For details, see Restrictions on Image Formats, Width and Height Alignment, and Buffers. milli_sec: int, 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.
Return Value	ret: int, error code. 0 indicates success. Other values: failure. For details, see VPC Return Codes. task_id: task ID, used to identify a task.

Restrictions

This API is compatible with the format conversion API provided by earlier versions of the Ascend AI Processor. Compatible input and output image formats are listed below. The same binary format is output in the compatible scenario.
- Input formats: YUV420SP, YVU420SP, YUV422SP, YVU422SP, YUV444 Packed, YUV444SP, and YVU444SP
- Output formats: YUV420SP and YVU420SP
- For the preceding formats, the binary output of this API is different from that of acl.himpi.vpc_convert_color.

The following enum values of hi_pixel_format are supported for the source image 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

If the output image formats can be the following enumerated values of hi_pixel_format. Other image formats are not supported and would cause a failure return.
```
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, buffer size, and image format, see Restrictions on Image Formats, Width and Height Alignment, and Buffers.

Parent topic: VPC APIs