[FFmpeg-soc] vp8 de/packetizers

[Josh Allmann]

On 4 August 2010 03:32, Luca Barbato <lu_zero at gentoo.org> wrote:
> On 08/04/2010 09:59 AM, Martin Storsjö wrote:
>> David, how large is this first data partition approximately? The frames
>> are fragmented into RTP packets of around ~1450 bytes (usually) - so if
>> we've got the first packet of a frame but not the rest, would we be better
>> off returning this than just skipping it?
>
> Even better: is there a way to get this information?
>
> If is common for every packet/there is a known upper bound, we can pass
> it through the sdp, or if not we could think about storing the value in
> an extension header.
>

Not sure; I'd have to dig through the bitstream spec for this. Ronald,
do you happen to know off the top of your head?

> Still I guess we could extend the depacketizer interface to get all the
> standard rtp information as well.
>

Attached patches should work against the updated VP8 rtp proposal*.
Also pulled from latest trunk, so they also work with the Xiph stuff.

The depacketizer now supports multiple VP8AUs in one packet but I
haven't tested that codepath, because VP8AUs are not used by the
packetizer.

* https://groups.google.com/a/webmproject.org/group/webm-discuss/msg/eef6d312ac5c09c3?dmode=source&output=gplain

Josh