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Last Post 17 Oct 2008 02:02 AM by  flyingbird_hi@126.com
how to display YUV picture on the LCD
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flyingbird_hi@126.com
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--
17 Oct 2008 02:02 AM
    i want to display the YUV(4:2:0)picture on the LCD.
    i do in the following ways:
    #include <linux/fb.h>
    #include <asm-arm/arch-omap/omapfb.h>
    setup_fb(int width, int height)

    {

    int fb = open("/dev/fb0", O_RDWR);



    if (fb == -1)

    {

    perror("/dev/fb0");

    exit(1);

    }



    if (ioctl(fb, FBIOGET_VSCREENINFO, &sinfo_p0) == -1)

    {

    perror("FBIOGET_VSCREENINFO");

    exit(1);

    }

    if (ioctl(fb, OMAPFB_QUERY_PLANE, &pinfo) == -1)

    {

    perror("OMAPFB_QUERY_PLANE");

    exit(1);

    }



    if (ioctl(fb, OMAPFB_QUERY_MEM, &minfo) == -1)

    {

    perror("OMAPFB_QUERY_MEM");

    exit(1);

    }



    sinfo.xres = FFMIN(sinfo_p0.xres, width) & ~15;

    sinfo.yres = FFMIN(sinfo_p0.xres, height) & ~15;

    sinfo.nonstd = OMAPFB_COLOR_YUV420;



    if (ioctl(fb, FBIOPUT_VSCREENINFO, &sinfo) == -1)

    {

    perror("FBIOPUT_VSCREENINFO");

    exit(1);

    }



    pinfo.enabled = 1;

    pinfo.pos_x = sinfo_p0.xres / 2 - sinfo.xres / 2;

    pinfo.pos_y = sinfo_p0.yres / 2 - sinfo.yres / 2;

    pinfo.out_width = sinfo.xres;

    pinfo.out_height = sinfo.yres;



    if (ioctl(fb, OMAPFB_SETUP_PLANE, &pinfo) == -1)

    {

    perror("OMAPFB_SETUP_PLANE");

    exit(1);

    }



    return fb;

    }



    in the main function:

    {

    fb = setup_fb(320,240);

    fbmem = mmap(NULL, minfo.size, PROT_READ|PROT_WRITE, MAP_SHARED, fb, 0);

    then we read the display YUV to fbmem.

    }

    then it display the "OMAPFB_QUERY_MEM invalid argument"
    can anybody tell me the reason
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