[rtmpdump] Proposal: dynamically loadable plugins

[Antti Ajanki]

Hi,

These patches implement the plugin API I proposed in my previous mail. 
There is also a slightly modified version of the callback patch 
included. Thanks for Adam for the comments. The same patches are also 
available here:

git clone http://users.tkk.fi/~aajanki/rtmpdump-yle/rtmpdump.git

This has been tested only on Linux. It also cross-compiles on mingw, but 
I haven't tried running it on Windows.

The patches add two new dependencies: libltdl for cross-platform dynamic 
library loading support and pthreads for synchronizing the loading of 
the plugins.

Here is a plugin (together with fully patches rtmpdump sources) that 
uses the API: http://users.tkk.fi/~aajanki/rtmpdump-yle/yle-dl-1.99.1.tar.gz

The plugin does custom authentication for 
http://areena-beta.yle.fi/ng/areena site. An example command for testing 
the plugin:

rtmpdump -r "rtmp://flashu.yle.fi/mediakanta//x 
swfUrl=http://areena-beta.yle.fi/static/player/1.1/flowplayer/flowplayer.cluster-3.2.3.swf 
tcUrl=rtmp://flashu.yle.fi/mediakanta/ 
pageUrl=http://areena-beta.yle.fi/ng/areena/tv/1370427/#/play 
yle=2f4d1d102a34462696ad23573adfd296" -o video.flv

Antti
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