Use the convention from lsp.c: an LSF is a frequency, an LSP is the
cosine of an LSF, and LSP functions should have an ff_acelp prefix.
Use a "d" suffix to specify doubles.

Patch by Colin McQuillan ( m.niloc googlemail com )


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19570 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b