[Buschel]

 

Maybe the bitrate could be another dirty option to select between lossy and lossless? Something like bitrate > 320? Or are there any lossy formats using, despite of being lossy, more than 320 kbit/s? Highres files almost always have bitrates > 1000…

This is imho not a good option. The bitrates depend on the amount of channels and also the compression ratio which can differ a lot for different material. I think it is really best to check if a lossless codec is meeting the HiRes requirements. And even this can of course be faked, e.g. upsampled material or decoded lossy material. But same problems exist with streaming/download services offering "HiRes" material -- so nothing I should worry about.

I will search for a few sample files to check which codec names are provided by the (current) Kodi API.