I have finally found a simple way of doing it.
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
CIImage *ciImage = [CIImage imageWithCVPixelBuffer:imageBuffer];
CIContext *temporaryContext = [CIContext contextWithOptions:nil];
CGImageRef videoImage = [temporaryContext createCGImage:ciImage
fromRect:CGRectMake(0, 0, CVPixelBufferGetWidth(imageBuffer),
CVPixelBufferGetHeight(imageBuffer))];
QPixmap pm = QtMac::fromCGImageRef(videoImage);
CVPixelBufferUnlockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
}
Nuno
> On 29 Feb 2020, at 09:09, Jason H <jh...@gmx.com> wrote:
>
> [replying to the list this time]
>
> I don't know if it is possible, but if CoreVideo can't do it OpenCV could
> probably do it. Not sure if 2vuy is in their list. Have a look at
> https://docs.opencv.org/3.4/d8/d01/group__imgproc__color__conversions.html#ga4e0972be5de079fed4e3a10e24ef5ef0
>
> This should be hardware accelerated to some degree...
>
>
>> Sent: Friday, February 28, 2020 at 7:26 PM
>> From: "Thiago Macieira" <thiago.macie...@intel.com>
>> To: interest@qt-project.org
>> Subject: Re: [Interest] Converting CVImageBufferRef into QImage
>>
>> On Friday, 28 February 2020 09:57:31 PST Nuno Santos wrote:
>>> Thiago,
>>>
>>> kCVPixelFormatType_422YpCbCr8 = '2vuy', /* Component Y'CbCr 8-bit
>>> 4:2:2, ordered Cb Y'0 Cr Y'1 */
>>>
>>> Missing your incredible replies already... You ROCK! :)
>>>
>>> The question is still pertinent in the Qt domain since there is no direct
>>> way of constructing a QImage from 2vuy color space.
>>
>> Then you convert yourself or via some HW acceleration.
>>
>> You may be able to ask CV to convert to ARGB32 in HW for you.
>>
>> --
>> Thiago Macieira - thiago.macieira (AT) intel.com
>> Software Architect - Intel System Software Products
>>
>>
>>
>> _______________________________________________
>> Interest mailing list
>> Interest@qt-project.org
>> https://lists.qt-project.org/listinfo/interest
>>
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