omxplayer framebuffer
Posted: Tue Mar 29, 2016 7:55 am
Hello.
I need for a projet to make a screen snapshot of the HDMI output. So I use the framebuffer ( /dev/fb0 ) and make a picture from the pixel.
Unfortunatly, it seems that video played with omxplayer doesn't use framebuffer, because if I see the video on the screen, I don't see her in the picture.
Does somebody knows how to make a snapshoot of a screen including the omxplayer output ?
Bellow is the code I use to initialize the framebuffer:
I need for a projet to make a screen snapshot of the HDMI output. So I use the framebuffer ( /dev/fb0 ) and make a picture from the pixel.
Unfortunatly, it seems that video played with omxplayer doesn't use framebuffer, because if I see the video on the screen, I don't see her in the picture.
Does somebody knows how to make a snapshoot of a screen including the omxplayer output ?
Bellow is the code I use to initialize the framebuffer:
Code: Select all
/// initialise framebuffer
int fbfd = 0;
struct fb_var_screeninfo orig_vinfo;
long int screensize = 0;
// Open the file for reading and writing
fbfd = open("/dev/fb0", O_RDWR);
if (!fbfd)
{
printf("Error: cannot open framebuffer device.\n");
return(1);
}
printf("The framebuffer device was opened successfully.\n");
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))
{
printf("Error reading variable information.\n");
}
printf("Original %dx%d, %dbpp\n", vinfo.xres, vinfo.yres,
vinfo.bits_per_pixel );
// Store for reset (copy vinfo to vinfo_orig)
memcpy(&orig_vinfo, &vinfo, sizeof(struct fb_var_screeninfo));
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))
{
printf("Error reading fixed information.\n");
}
// map fb to user mem
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
fbp = (char*)mmap(0,
screensize,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fbfd,
0);
if ((int)fbp == -1)
{
printf("Failed to mmap.\n");
}