[FFmpeg-soc] [PATCH] xiph packetizer

[Josh Allmann]

Hi guys,

Here is a first attempt at a RTP packetizer for the Xiph codecs.
This is still a work in progress; Vorbis likes to crash when rescaling
the timebase, and the Theora output only vaguely resembles what it
should. (There are some unrelated changes in there, particularly to
the depacketizer. I will separate those later.)

The only major architectural issue here is that the configuration
identifier (here hard-coded to 0xfedcba) needs to be carried across
from the SDP to the packetizer proper. Right now I don't believe there
is a clean way to do that without adding another field to
RTPMuxContext, a generic priv_data or something. The "best" way, IMO,
would be to structure RTP packetization in a way similar to how
depacketization is done -- through dynamic handlers.

We might be able to get away with a hard-coded configuration
identifier, but I don't know yet if my samples will periodically emit
in-band extradata. (The RFC provisions for this.) In that case, the
config ID needs to be refreshed, and kept across subsequent packets.

Josh
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