Tvheadend

The internal pipeline is a bit too inflexible at the moment. The rewrite needs to address these problems:

• Add a time-shifter.

• Remove cumbersome locking between nodes in the pipe.

• Prepare for adding live transcoders

This is how we want it to be:

 [Input source]-[Arbitration] -+-> [Transcoder X] -> [Timeshifter] -> ...
                               |
                               +-> [Transcoder Y] -> ....
                               |
                               +-------------------> [Timeshifter] -+-- Multiple
                                                                    +-- subscribers
                                                                    +-- (HTSP, RTSP, DVR, etc)