libsndfile
Doc omission regarding `src_process`
https://github.com/erikd/libsamplerate/blob/master/src/samplerate.h#L86
Doc is here: http://www.mega-nerd.com/SRC/api_simple.html
Documentation doesn't mention what happens if the output buffer is not big enough to hold the samplerate-converted input buffer.
It isn't certain if this will return an error or simply fill the output buffer, correctly making a note of how many input samples have been consumed in the data structure.
It would be very helpful to have this documented, as it would save a development test-cycle.
The person who wrote the code is rarely the best person to document the API, because the author makes assumptions about it that a newcomer is unlikely to make.
PR more than welcome.
src_process is designed to to not overflow the input or output buffers, and to operate correctly in a loop where it is constantly being called with updated SRC_DATA data.
If you call it with a zero length output buffer, it may consume input (and store it internally, but there is a limit to its internal storage), but it will not generate output and it will not result in an error.