[vorbis-dev] rtp implementation

Gregory Maxwell greg at linuxpower.cx
Sun Apr 8 15:55:07 PDT 2001

On Sun, Apr 08, 2001 at 02:56:08PM -0700, Jack Moffitt wrote:
> > I would like to implement the rtp specification.
> > Is anyone else interested in helping with the design/code?
> I would be glad to help, since I thought I would have to do this myself
> anyway.
> I think probably the best way to do it is just to start with a
> packetizer.  The output is just a collection of RTP packets,
> appropriately stamped, etc.
> Icecast does not currently have an RTP streaming layer, and that will
> have to be implemented at some point as well.  As long as we keep the
> two independent, we should end up with a flexible architecture.
> > Jack: i'm interested in your opinion on the difficulty of this since you
> > worked on the rfc spec.
> Before you begin, there are a few warnings and suggestions:
> - this is a draft.  it will change.  whatever code you write will need
> modification as the draft changes.  keep this in mind :)
> - i have several edits to the draft that are minor trivial things, but I
> would like to put them in before you start.  i just want to incorporate
> the feedback i got and flesh out a few sections.
> - i would suggest that you only consider unicast rtp streams for
> starters.  the multicast method of reliably transmitting the codebooks
> has still not been determined.  and the ietf seems to think that
> reliable multicast might be the best solution, which afaict doesn't
> exist yet.
> That's about it.  What language are you planning to implement this in?
> Icecast is currently written in C, and that's not likely to change.
> jack.

The codebooks are rather small, it seems silly to delay standardization on
far off protocols when it would probably suffice to send the next-song's
codebook in-band in another packet-type (with sufficient FEC and redundancy to
ensure that any listeners will have it by the time it's needed), combined with
client-side codebook caching and an out-of-band TCP method for obtaining
codebooks for mid-stream listeners.

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