[SDL] Problem using SDL in a winamp plugin

[Boris Gjenero]

A while ago I tried to port synaesthesia-2.1 to Windows and make a Winamp
plugin for it.  I got it to work the first time I activate the plugin but
after that it'd fail to start up again.  (I'd have to restart Winamp to use
the plugin again.)

I've now done some more investigation of what's going on using SDL-1.2.
SDL_Init(SDL_INIT_WINDOW) is failing with "DirectInputCreate: Invalid
parameters".   In a normal program I can keep restarting SDL (doing a quit
followed by an init) all I want.  In a Winamp plugin I can restart it in the
init function or in the quit function.  I can start and stop it in the init
function and again start and stop it in the quit function.  I can do
anything I want with SDL the first time the plugin is started, but I get the
error on all subsequent attempts to start it.  Once one plugin that uses SDL
is started and stopped no other plugins that use SDL will work either.

I made a totally stripped down Winamp visualization plugin.  The init
function just calls SDL_Init(SDL_INIT_VIDEO) and the quit function just
calls SDL_Quit().   It fails the 2nd time I run it.

What's going on?

--
Boris