Hi,
I’m trying to capture my Mac screen. I’ve found an example of
AVCaptureScreenInput. It seems to be working but now I need to convert from
CMSampleBufferRef/CVImageBufferRef to QImage. I’m trying the following code
without success:
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
unsigned char *pixels = ( unsigned char
*)CVPixelBufferGetBaseAddress(imageBuffer);
int width = CVPixelBufferGetWidth(imageBuffer);
int height = CVPixelBufferGetHeight(imageBuffer);
int bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
qDebug() << width << height << bytesPerRow <<
CVPixelBufferGetPixelFormatType(imageBuffer);
// outputs -> 1920 1080 3840 846624121
QImage image(pixels, width, height, bytesPerRow, QImage::Format_ARGB32);
qDebug() << image;
}
But the image is invalid. I guess the pixel format is not compatible.
I don’t know how to interpret the CVPixelBufferGetPixelFormatType(imageBuffer)
to know the exact pixel format.
As anyone crossed with a similar problem before?
Thanks!
Regards,
Nuno_______________________________________________
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