[Vorbis] Ogg files versus Ogg streams

[Robert Hui]

Hi all,

I'm very new to Ogg, and am learning about it in an attempt to stream it 
from a CF card through a microcontroller.  This particular setup requires 
me to move parts of the file from the CF card to the microcontroller 
buffer, effectively making the file like a data stream.  Also, should this 
question be directed at the Tremor group instead since that is the codec 
I'm using?  It seems like a generic Vorbis question, versus something 
specific to Tremor.

My question is this: As far as ov_open_callbacks(..) is concerned, is the 
*datasource parameter expecting a pointer to part of an Ogg file 
(specifically, the beginning where I assume the Ogg identifying info is 
placed).  And if this is the case, can I assume that bringing the Ogg file 
in piece-meal fashion only requires a change to the way ov_read(..) will 
handle not having enough data to decode a single Ogg page (i.e. - if the 
remaining data to be decoded is >1 Ogg page)?  Note that I do not need the 
ability to seek in this file, only play back the file.

Thanks,
Robert Hui