[FFmpeg-devel] [POC][PATCHSET] Add qrencodesrc source

[Stefano Sabatini]

This is meant to introduce functionality to handle QR codes.

This is still in early development stage (missing docs, padding
functionality to avoid to insert a pad filter?), plus a filter will be
added for adding a QR code on the input reading from metadata, and
possibly at some point also a quirc-based decoder, but comments are
welcome.

QR codes are robust to lossy coding, therefore it should be possible
to use them to compare a generated video with a reference one (in case
they cannot be compared frame-by-frame).

[PATCH 1/2] lavfi: introduce textutils
[PATCH 2/2] lavfi: add qrencodesrc source