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How to downscale image that is outputted by SD VENC

marcus lu
Expert 1550 points

Hi Sir :

I work on DM8148 platform and use DVRRDK_03.00.00.00 to develop our system.

I try to down scale image and change it's X,Y position that is outputted by SD VENC.

In other words, I want to adjust the resolution and position of image that is outputted by SD VENC.

I try to use Demo_displaySetResolution to down scale image but it does not work.

Could you please give me some suggestion or example that shows how to down scale image ?

Best regards,

Marcus

Marcus

  • 0
    TI__Guru 59700 points

    SD VENC can output only NTSC or PAL resolution and it is not possible scale it. Do you want to display the image in a small portion of the screen and keep the remaining blank ?

  • 0 in reply to Badri Narayanan
    Expert 1550 points

    Hi Badri:

    I appreciate your reply!

    I think I post wrong question.

    I know the SD venc can only output NTSC or PAL resolution.

    My question is how to resize OSD image that is outputted by SD venc?

    I had worked on DM365 platform and I remembered that I could adjust OSD registers to resize image or change the position of the image.

    I try to use grpx_fb_scale routine to adjust size but it does not work.

    Please give me some suggestion or example!

    Best regards,

    Marcus

  • 0 in reply to marcus lu
    TI__Guru 59700 points

    Do you mean you want to scale the graphics plane ? Are you first seeng graphics on SD VENC ? What is the issue you see when you scale the graphics plane

  • 0 in reply to Badri Narayanan
    Expert 1550 points

    Hi Badri:

    I appreciate your reply!

    Yes, I want to scale the graphics plane.

    I try to modify grpx_fb_start_singleBufTied() routine in graphic_single_buf_tied.c to scale the graphics plane.

    Below is what I modify.

    Demo_swMsGetOutSize(Vdis_getResolution(VDIS_DEV_SD), &outWidth, &outHeight);
    //grpx_fb_scale(VDIS_DEV_SD, 0, 0, outWidth, outHeight);
    grpx_fb_scale(VDIS_DEV_SD, 0, 0, outWidth/2, outHeight);

    However, when system run this routine, the system hangs.

    Could you show me how to scale the graphics plane?

    Please help me!

    Best regards,

    Marcus

  • 0 in reply to marcus lu
    Expert 1550 points

    Hi Badri:

    Today, I find out a example saFbdevScalingDisplay.c that shows how to scale the graphics using fb0.

    I try to modify the file and downscale 720*480 to 360*240, but the error message below shows.

    MMap Failed!

    I wonder if it can downscale or something I make a mistake.

    Could you give me some suggestions?

    As I know, DM8148 use single_buf_tied for HDMI and SD venc.

    Does it mean that they use the same memory buffer for display?

    I can see the graphic on screen is downscale but the video image is not.

    Could you give me some idea to downscale video image?

    I really need your help!

    Best regards,

    Marcus 

  • 0 in reply to marcus lu
    Expert 1550 points

    Hi Sir:

    Is there anyone could give me some suggestion?

    Best regards,

    Marcus