I have seen many equations where $P$ and $C$ (eigenvalues of parity and charge conjugation, resp.) are related to $J$, $L$, $S$ and $I$ (eigenvalues of total angular momentum, angular momentum, spin, isospin, resp.). Unfortunately, I do not understand why some of them seem to be different. The wiki page on Parity states: $$P=(-1)^L$$ whereas this review by the PDG states $$P=(-1)^{L+1}$$I guess it is important to know what you want to describe (wiki: wave function $|\ell,m_\ell\rangle$ whereas PDG: mesons), but this does not help my understanding. Similar confusion arises for $C$.
I would be grateful for some clarification regarding the relation of $C$ and $P$ to $L$, $S$ and $I$ as well as some hints on how to derive these relations!