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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

a non-crash type race between artist and title fields updating.  Also allow
passing a url setting, mapping to StreamURL in the icy metadata block, but do
not override any existing inline setting.

svn path=/icecast/trunk/icecast/; revision=15622

very small blocks and go out in those same small blocks increasing the protocol
overhead used by the provided. Generally occurs when using a low bitrate stream
and many listeners.  With this patch we pack out a refbuf before queuing.
Add missing include for vorbis build that shows on some platforms

svn path=/icecast/trunk/icecast/; revision=9718

svn path=/icecast/trunk/icecast/; revision=9233

svn path=/icecast/trunk/icecast/; revision=9152

svn path=/icecast/trunk/icecast/; revision=7592

This fixes stats.xml listings for mp3 slave relays with metadata.
We get rid of 'metadata_raw', since we now have to format out that stuff anyway.

svn path=/trunk/icecast/; revision=5815

svn path=/trunk/httpp/; revision=5792

    a) based on total bytes in queue, not total number of buffers in queue
    b) configurable (defaults to 100 kB)

mp3 metadata relaying (inline). Untested.

svn path=/trunk/icecast/; revision=4364

svn path=/trunk/icecast/; revision=4353

Untested but more or less complete.
No way to actually set the metadata yet.

svn path=/trunk/icecast/; revision=4178

svn path=/trunk/icecast/; revision=4177

- no title/metadata support
- requires modifications to source clients.

svn path=/trunk/icecast/; revision=3713