[vorbis] retrieving "instant" bitrate without vo_open?

[safemode]

ok, I'm aware that vo_open cant be used at the same time as other functions 
such as ogg_sync_wrote, ogg_sync_pageout, ogg_stream_pagein, 
ogg_stream_packetout and vorbis_synthesis_headerin.   In order to get 
information from the bitstream i've been using this method because it's fast 
and doesn't require decoding of the stream.  But, i can only retrieve the 
average bitrate of the ogg stream with the vorbis_info struct.  I tried using 
vo_open but could only retrieve garbage values and it's because i basically 
dont know how to use it to do the same thing i'm doing here.  

All i need to do is traverse the entire bitstream, take each packet and look 
at it's individual bitrate.  Can i do this without vo_open or is there a way 
to use vo_open and the ogg functions i've listed above ?  I'm not aware of 
any way to set the vorbis_file struct to the current packet without at least 
using vo_open and doing that ruins the ogg functions in my tests.   

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