New Audio Element based on Csound

Submitted by Natanael Mojica @neithanmo

Link to original bug (#794852)

Description

Created attachment 370365
csoundfilter element

The element csoundfilter implement an audio processing unit based in the Csound API. this let us to access to many csound plug-ins called "opcodes", with this opcodes we write instruments and determinate when each instrument will be executed thanks to the score section in a .csd file called, "csound file", so, with the same element we can to perform different operations on audio buffers by only changing the .csd file.
for more info about csound check:

http://csound.com/get-started.html
http://floss.booktype.pro/csound/preface/

hope someone can to review this and let me known any suggest, I think integrating the Csound capabilities with Gstreamer will be a great feature for both, Gstreamer and Csound users.

the git include the sources and an use example

Patch 370365, "csoundfilter element":
csoundfilter.patch