(applying lessons learned from libshout)

Signed-off-by: Marvin Scholz <epirat07@gmail.com>

Move the cluster test inside the space-to-read check with the other tests.

We'll sync keyframes on that track next commit.

* Loop over elements in input buffer.
* Most are literally copied with their contents without
  inspection into the header or data buffers as appropriate.
* Some only copy the element header, to allow inspecting
  children elements.
* Cluster elements are identified and used as sync points.

No probing is done for keyframes *yet*

This will allow leaving unparsed data in the input buffer to wait for completion.

This simplifies some fragile "was the last chunk a sync point?" logic.

This should help make future changes to the code clearer.

This is a first commit to correct minor problmes reported by
Denis Denisov. There is likely another commit to correct some more
such problems.

Thank you Denis Denisov.

All metadata is now extracted from Vorbis streams and ICY streams
and exported as new <metadata> tag into admin/stats if specific
mountpoint is requested.

To testers:
 - Please test with Ogg Vorbis streams.
 - Please test with Ogg Vorbis + Theora streams.
 - Please test chained Ogg streams.
 - Please test with ICY streams.

close #2106

svn path=/icecast/trunk/icecast/; revision=19376

cleanup: converted printf() into ICECAST_LOG_DEBUG() but commented out so they do not spam logs for normal users.

svn path=/icecast/trunk/icecast/; revision=19368

LOG_{ERROR|WARN|INFO|DEBUG}() -> ICECAST_LOG_{ERROR|WARN|INFO|DEBUG}(); this is to avoid collision with LOG_INFO that is defined as part of syslog.

svn path=/icecast/trunk/icecast/; revision=19257

svn path=/icecast/trunk/icecast/; revision=19229

Icecast itself remains GPLv2 only.

svn path=/icecast/branches/icecast-webm/; revision=18307

Also update the license statement to GPL2 or later.

svn path=/icecast/branches/icecast-webm/; revision=18303

This is a self-contained ebml parser. It just looks
for cluster boundaries and breaks the stream there.

svn path=/icecast/branches/icecast-webm/; revision=18297