Merge libavcore into libavutil
It is pretty hopeless that other considerable projects will adoptlibavutil alone in other projects. Projects that need small footprintare better off with more specialized libraries such as gnulib or ratherjust copy the necessary parts that they need. With this in mind, nobody...
Use the new libavcore audio channel API.
This also allows to remove a linking dependency of libavfilter onlibavcodec.
Originally committed as revision 25789 to svn://svn.ffmpeg.org/ffmpeg/trunk
Add asrc_anullsrc - null audio source.
Based on a patch by "S.N. Hemanth Meenakshisundaram" smeenaks!ucsd!edu.
Originally committed as revision 25188 to svn://svn.ffmpeg.org/ffmpeg/trunk