[Tremor] questions on porting Tremor

[Ethan Bordeaux]

Hey that's great you're looking into this.  Personally I think option #1
would be the better choice for me, as maintaining usage and validity of
checksums is quite important for my application.  That said, I'm not sure I
quite get what the downside to the first option would be, so I can't say for
certain if there wouldn't be issues with the dual stream pointers.  Still,
it's great to hear that this is working its way officially into Tremor.

Ethan

On Tue, Sep 8, 2009 at 2:22 PM, <xiphmont at xiph.org> wrote:

> > Monty - if I remember correctly there were some vague plans to officially
> > incorporate this sort of feature into the source.  Is that right?
> > Personally I think it would be a huge help, especially to have the
> ability
> > to skip large tags like image files while still maintaining the basic
> > metadata.
>
> Yes, and I've actually worked a bit on it.  It boils down to doing it
> one of two ways: Having two seperate pointers into the stream (pointer
> A can read ahead and do framing without any need to actually buffer,
> pointer B is on-demand data reading and if there's no demand for the
> data it can just skip past.  This scheme means buffering overhead is
> essentially zero, but you need to be able to have two stream pointers,
> so it's not really streaming) or the second possibility is ignoring
> checksum and only doing 'light framing' where any damage to the stream
> would get through and be read as data (to be fair, this is how most
> other non-Ogg systems work).
>
> Monty
>
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