how can DM6467 display a picture whose resolution less than D1

Hi,

DM6467 does not have resizer to upscale input image. it has resizer to only down scale input images. You will have to resize these images in the application.

If you just want to display these image, you can display it using dm6467 vpif drivers. Driver supports displaying small images on a big resolution. Let me know if you need more details.

Thanks,

Brijesh Jadav

Hi

I am so sorry to reply you on time, and I don't understand the vpif  ， I thought  Display moudule in dmai is just using vpif drivers, can you give me some information on vpif and tell me what I should do if I want to use vpif to display a small images on a big resolution.

thank you

Dingguo Peng

Hi,

Basically, VPIF display driver does support display of small frame size on big resolution. It supports only YUV422 SP pixel format, in which Luma and Chroma planes of all pixels are stored in separate buffers. VPIF display driver provide single buffer for storing images. In this buffer, you will need to copy Luma portion of the image at 0 offset and chroma portion at the middle of the buffer. And then you will need to set the pitch correctl. It will display the complete buffer even if image stored is of small size.

Thank,

Brijesh Jadav

Hi

I still can not understand the vpif, can you tell me which DMAI MODULE integrate the vpif driver?

thank you

Dingguo Peng

Hi,

I believe there should be separate DMAI modules for VPIF capture and display.

Please go through the VPIF user guide to understand how VPIF driver uses buffers, which part of the buffer it uses for luma and chroma data. It clearly explains these things.

Thanks,

Brijesh Jadav