Those functions are only useful inside filters. It is better to not support user filters until the API is more stable. This breaks audio filtering API and ABI in theory, but since it's unusable right now this shouldn't be a problem.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Patch by S.N. Hemanth Meenakshisundaram -af smeenaks,ucsd,edu. Originally committed as revision 24856 to svn://svn.ffmpeg.org/ffmpeg/trunk