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It looks like your problem is

It looks like your problem is different from 'no way to set output_tiff=1 via C-API':
- LibRaw internals are different from dcraw's while we keep some compatibility via dcraw_emu sample
- in particular, there is no document_mode (-d/-D options in dcraw), because unaltered raw data is already accessible via https://www.libraw.org/docs/API-datastruct.html#libraw_rawdata_t

So, it looks like you need to implement direct access to this data from your app (I'm not sure you need intermediate TIFF storage because data is already here).

-- Alex Tutubalin