Direct the decoder to pass on all APPLICATION metadata blocks of the
given \a id.
\default By default, only the \c STREAMINFO block is returned via the
metadata callback.
\param decoder A decoder instance to set.
\param id See above.
\assert
\code decoder != NULL \endcode
\code id != NULL \endcode
\retval FLAC__bool
\c false if the decoder is already initialized, else \c true.
Direct the decoder to pass on all APPLICATION metadata blocks of the given \a id.
\default By default, only the \c STREAMINFO block is returned via the metadata callback. \param decoder A decoder instance to set. \param id See above. \assert \code decoder != NULL \endcode \code id != NULL \endcode \retval FLAC__bool \c false if the decoder is already initialized, else \c true.