Hi, I'm trying to create a QImage from a QVideoFrame but my video has YUV420P
format so converting it's not easy for me at all. By using a snippet from
histogram class from the player example provided by Qt I was able to read each
pixel on the frame but my question is: who can I decompose Y, Cb and Cr values
from a single uchar?
This is how to I'm iterating over the video frame bits.
if (videoFrame.pixelFormat() == QVideoFrame::Format_YUV420P) {
QImage nImage(videoFrame.width(), videoFrame.height(),
QImage::Format_RGB32);
uchar *b = videoFrame.bits();
for (int y = 0; y < videoFrame.height(); y++) {
uchar *lastPixel = b + videoFrame.width();
int wIndex = 0;
for (uchar *curPixel = b; curPixel < lastPixel; curPixel++) {
double y_ = *curPixel;????????
double u_ = ???????????;
double v_ = ???????????;
r = y_ + 1.402 * v_;
g = y_ - 0.344 * u_ - 0.714 * v_;
b = y_ + u_ * 1.772;
nImage.setPixel(wIndex, y, qRgb(int(r), int(g), int(b)));
++wIndex;
}
b += videoFrame.bytesPerLine();
}
return nImage;
}
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