Signature for the tell callback.
The signature and semantics mostly match POSIX ftell() WITH ONE IMPORTANT
EXCEPTION: the offset is a 64-bit type whereas ftell() is generally 'int'
and 32-bits wide.
\param handle The handle to the data source.
\retval FLAC__int64
The current position on success, \c -1 on error.
Signature for the tell callback. The signature and semantics mostly match POSIX ftell() WITH ONE IMPORTANT EXCEPTION: the offset is a 64-bit type whereas ftell() is generally 'int' and 32-bits wide.
\param handle The handle to the data source. \retval FLAC__int64 The current position on success, \c -1 on error.