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Rotate captured image physically#36

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@alavers

馃憢

It looks like images captured from ReceptionKit are rotated via exif metadata here. Unfortunately Slack does not obey these tags, and displays portrait images as 90 degrees rotated.

According to https://developer.apple.com/library/archive/qa/qa1744/_index.html it might be possible to receive image buffers that are already rotated to the correct orientation:

AVCaptureVideoDataOutput clients may receive physically rotated CVPixelBuffers in their -captureOutput:didOutputSampleBuffer:fromConnection: delegate callback. All 4 AVCaptureVideoOrientation modes are supported, and rotation is hardware accelerated. To request buffer rotation, a client calls -setVideoOrientation: on the AVCaptureVideoDataOutput's video AVCaptureConnection.

WDYT?

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