Make sure a codec is not only known to us, but that it can actually be
used, in places where it makes sense. This is partially redundant
because ensure_codec_def_type already takes care of this, but a codec
definition may come from a different source, so it doesn't help to
double check.
Change-Id: I91af84afc2477840f1400674b2538ad8fb7746ee
(cherry picked from commit 7b60e85970)
(cherry picked from commit f359725d3f)