[vorbis] Exact decode positioning

[Michael Smith]

On Friday 24 January 2003 20:36, Paul Noffke wrote:
> Giuliano,
>
> I have this mechanism working for the MAD mp3 decoder and I'm getting the
> players sync'd to within 10 milliseconds.  The method I use is to have
> the "master player" map it's current playback (decoded) position to the
> corresponding encoded (raw) position.  The "slave player" then reverse maps
> this and compares the result to it's own playback position to make
> adjustments.
>
> And so the key is the "encoded/decoded" cross-reference map.  With MAD I
> can work out the position in the encoded (raw) stream for each frame that
> is decoded.  Does anyone know how I could do this using the ogg file
> interface?

<p>You'll need to not use libvorbisfile (if you don't require seeking, then the 
lower-level libogg and libvorbis interfaces aren't too bad to use - if you do 
need seeking, then it's really hard to do correctly). Then you can easily 
maintain a direct mapping between packet and decoded offset.

Mike

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