After fighting hard with uv I had success! If anyone is interested here is
my piece of
code: https://gist.github.com/joerg-krause/8c0a1fe1c67e1a34b28ff7efec9d5dec.
On Thursday, May 12, 2016 at 10:11:47 AM UTC+2, Jörg Krause wrote:
>
> Hi,
>
> I am trying to integrate ALSA volume event handling into a Luvit project.
> I have some working (LuaJIT) code now:
>
> function elem_event(elem, mask)
> print("Volume changed...")
>
> -- self:emit("volumechange")
>
> return 0
> end
>
>
>
> function mixer_event(mixer, mask, elem)
>
> local sid_ptr = ffi.new("snd_mixer_selem_id_t")
>
> local sid = sid_ptr
>
>
>
> alsa.snd_mixer_selem_get_id(elem, sid)
> print("event add");
>
>
> alsa.snd_mixer_elem_set_callback(elem, elem_event)
>
>
> return 0
> end
>
>
> function M.monitor(card)
> local mixer_ptr = ffi.new("snd_mixer_t *[1]")
>
> alsa.snd_mixer_open(mixer_ptr, 0)
> local handle = mixer_ptr[0]
>
> alsa.snd_mixer_attach(handle, card)
>
> alsa.snd_mixer_selem_register(handle, nil, nil)
>
> alsa.snd_mixer_set_callback(handle, mixer_event)
>
>
> alsa.snd_mixer_load(handle)
>
> print("Ready to listen...\n");
> while true do
> local err = alsa.snd_mixer_wait(handle, -1)
> if err >= 0 then
> print("Poll ok: " .. err)
> err = alsa.snd_mixer_handle_events(handle)
> p(err)
> end
> end
>
> alsa.snd_mixer_close(handle)
> end
>
> functio M.get_volume(card)
> [..]
> end
>
> I have read the blog post about integrating libcurl into Luvit. Howeverm,
> I still do not know, how to integrate the poll loop into Luvit, so that I
> can run the monitor function and call other functions from the module, like
> get_volume(). Furthermore, I want to emit an event, when the volume has
> changed.
>
> I'm thankful for any hints!
>
> Best regards
> Jörg Krause
>
>
>
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