Returns the number of logical bitstreams within our physical bitstream.
long ov_streams(OggVorbis_File *vf);
Parameters
vf
A pointer to the OggVorbis_File structure--this is used for ALL the externally visible vorbisfile
functions. Once this has been called, the same OggVorbis_File
struct should be passed to all the vorbisfile functions.
Return Values
1 indicates a single logical bitstream or an unseekable file.