* Read tags
* profiling and optimisation for C implementation
* For operation without a demuxer (the common case), do
  indexing and exact seeking.
* Support MPEG-2.5 lower sampling rates 8000, 11025, 12000
* Support 24-bit and multi-channel extensions?

Done bits
---------
* Resynchronise after seeking
* Make gst-launch filesrc location=blah blocksize=1 ! flmp3dec ! alsasink work 
  by collecting buffers below a minimum size
* Merge in IPP branch for conditional compilation
* Fix hanging on seeks and 'no discont' messages in totem.
* Implement replication of a previous error-free frame
* xing headers