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Linux DVB API V4 Prototype

Linux DVB API V4 TODO
=====================

What works:

- currently one can watch TV on av7110 based DVB-S cards
  (czap and tzap are not yet ported to the new API..)
- very basic section and TS packet filters work, just
  enough for scan

I'm currently working on the buffering layer for the
demux device, and on the integration of the software demux.

The basic question here is whether we want to allow
multiple TS filters on the same PID (or multiple section filters
matching the same data). Hardware normally does not allow this
(only the first matching filter will get the data), so if we
want this we need to have a second ring buffer per file
descriptor and copy all data once. I will probably do
the copying thing for section filters (where bandwidth is
usually low), but probably not for TS filters, and
certainly not for recording filters.

Compared to the V3 DVB core layer, I decided to remove the
"kernel demux API". The original Nokia documents state that
the intention was to allow different "API clients" above
the "kernel demux API". One such client was the V3 ioctl
API, another one could have been a "DVB socket API", which
was never implemented, IMHO because it is unnecessary.


TODO:
- buffering (want multiple filters on the same PID?)
- complete section filter and TS filter handling
- recording filters
- software demux
- locking is currently broken (or non-existant)
  (IOW you can easily cause kernel panics)
- I plan to add dvb_net to the demux core, so hw drivers
  do not have to register dvb_net support seperately
  (i.e. dvb_register_dmxdev() automatically creates the
  DVB net device)
- remuxing stuff for av7110 TS record/playback is currently
  excluded; I think I will drop TS playbakc support
  altogether (was broken anyway), and add TS record for
  the currently decoded PIDs later (required PES -> TS remux)
- video/audio playback control
- CI
- last but not least, API documentation...