After a bitstream has been opened using ov_open and decoding is complete, you must call ov_clear() to clear
the decoder's buffers and close the file for you.
int ov_clear(OggVorbis_File *vf);
Parameters
vf
A pointer to the OggVorbis_File structure--this is used for ALL the externally visible vorbisfile
functions. After ov_clear has been called, the structure is deallocated and can no longer be used.