Displaying Buffer data on Qlabel

[sankar-110]

Hi,
I have a buffer data of color format YUY2 /UYVY/NV12/NV21 etc.

How do I display/render the buffer using qlabel??

[SGaist]

Hi,

You'll have to convert it to one of the supported QPixmap type first.

[sankar-110]

@SGaist
Thank you for your reply.

Below is my code for displaying/rendering "RGB" buffer on a Qlabel.

     QImage  *img = new QImage(camera->width ,camera->height, 
     QImage::Format_RGB32);

 uint8_t *l_ui_arr = new uint8_t[g_size_v4l2];
 if (!l_ui_arr)
 {
    qDebug() << "Memory allocation failed for arr\n";
 }

 camera->head.start // This is my buffer
 g_size_v4l2 // The size of the buffer
camera->height // Height of my image
camera->width // width of my image

memcpy(l_ui_arr,camera->head.start,g_size_v4l2);
for(uint32_t l_height = 0; l_height < camera->height; l_height++)
{
  for(uint32_t l_width = 0; l_width < camera->width; l_width++)
  {
       QRgb value = qRgb(l_ui_arr[l_ui_arrayIndex], l_ui_arr[l_ui_arrayIndex+1], l_ui_arr[l_ui_arrayIndex+2]);
       l_ui_arrayIndex = l_ui_arrayIndex+3;
       img->setPixel(l_width, l_height,value);
  }
}
ui->label->setPixmap(QPixmap::fromImage(*img,Qt::AutoColor));

Now, when I get buffer of any other format such as NV12/NV21/UYVY etc.

How do I convert it to the supported QPixmap type??

[mranger90]

You probably have to do the conversion from NV12/UYVY etc to RGB yourself then generate the pixmap.
There's lots of code available to show how to do this. Check StackOverflow.