Read all metadata from an Ogg FLAC file into the chain.
\note Ogg FLAC metadata data writing is not supported yet and
FLAC__metadata_chain_write() will fail.
\param chain A pointer to an existing chain.
\param filename The path to the Ogg FLAC file to read.
\assert
\code chain != NULL \endcode
\code filename != NULL \endcode
\retval FLAC__bool
\c true if a valid list of metadata blocks was read from
\a filename, else \c false. On failure, check the status with
FLAC__metadata_chain_status().
Read all metadata from an Ogg FLAC file into the chain.
\note Ogg FLAC metadata data writing is not supported yet and FLAC__metadata_chain_write() will fail.
\param chain A pointer to an existing chain. \param filename The path to the Ogg FLAC file to read. \assert \code chain != NULL \endcode \code filename != NULL \endcode \retval FLAC__bool \c true if a valid list of metadata blocks was read from \a filename, else \c false. On failure, check the status with FLAC__metadata_chain_status().