[MPlayer-dev-eng] [PATCH] Adds -af help to list all audio filters (Bugzilla bug #19)

[Reimar.Doeffinger at stud.uni-karlsruhe.de]

Hi,

> This patch makes -af help list all available audio filters. Also updated the
> manual page, analog to -vf help.
> 
> Is this OK to commit?

I posted a patch that does the same two days ago. Nobody responded so far. As
mine lacks the manpage part, I'd say commit it, except for a few changes:
1) remove the useless return in the af_help function and also add a newline at
the end of file so that the compiler doesn't complain.
2) make the comment for af_help start with /**, so that doxygen will recognize it.

Greetings,
Reimar Döffinger