Evidence from Chris suggests that imported OGG files can clip, so check for that.

git-svn-id: svn://localhost/ardour2/branches/3.0@7095 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/sndfileimportable.cc

@@ -86,5 +86,5 @@ SndFileImportableSource::clamped_at_unity () const
 {
 	int const sub = sf_info.format & SF_FORMAT_SUBMASK;
 	/* XXX: this may not be the full list of formats that are unclamped */
-	return (sub != SF_FORMAT_FLOAT && sub != SF_FORMAT_DOUBLE);
+	return (sub != SF_FORMAT_FLOAT && sub != SF_FORMAT_DOUBLE && sub != SF_FORMAT_OGG);
 }