ios - Broken cv:Mat from CMSampleBufferRef when using AVCaptureSessionPresetPhoto -


i using code create cv::mat cmsamplebufferref. works fine avcapturesessionpreset's (high, medium, low) when use avcapturesessionpresetphoto outputs garbled image.

- (cv::mat) matfromsamplebuffer:(cmsamplebufferref) samplebuffer {     cvimagebufferref pixelbuffer = cmsamplebuffergetimagebuffer(samplebuffer);      cvpixelbufferlockbaseaddress( pixelbuffer, 0 );      int bufferwidth = cvpixelbuffergetwidth(pixelbuffer);     int bufferheight = cvpixelbuffergetheight(pixelbuffer);     unsigned char *pixel = (unsigned char *)cvpixelbuffergetbaseaddress(pixelbuffer);      cv::mat mat(bufferheight,bufferwidth,cv_8uc4,pixel);      cvpixelbufferunlockbaseaddress( pixelbuffer, 0 );      return mat; }

when use avcapturesessionpresetphoto produces:

garbled

but other profiles create cv:mat fine. can help?

solved, missing step size in bytes: 

- (cv::mat) matfromsamplebuffer:(cmsamplebufferref) samplebuffer {     cvimagebufferref pixelbuffer = cmsamplebuffergetimagebuffer(samplebuffer);      cvpixelbufferlockbaseaddress( pixelbuffer, 0 );      int bufferwidth = cvpixelbuffergetwidth(pixelbuffer);     int bufferheight = cvpixelbuffergetheight(pixelbuffer);     int bytesperrow = cvpixelbuffergetbytesperrow(pixelbuffer);     unsigned char *pixel = (unsigned char *)cvpixelbuffergetbaseaddress(pixelbuffer);      cv::mat mat(bufferheight,bufferwidth,cv_8uc4,pixel,bytesperrow);      cvpixelbufferunlockbaseaddress( pixelbuffer, 0 );      return mat; }

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