[openbeos-midi] Re: Other question on BMidiEndPoint
- From: Philippe Houdoin <philippe.houdoin@xxxxxxx>
- To: openbeos-midi@xxxxxxxxxxxxx
- Date: Thu, 10 Oct 2002 19:34:01 +0200 (MEST)
Quoting Jerome Leveque:
> how is decided the id of the BMidiEndPoint?
Hum, a always increasing global next_midi_endpoint_id count somewhere in
the midi_server (where should live the midi endpoints *roster*)?
> Now question about Register an Unregister
> I think for this 2 functions that publish device in /dev/midi/ for other
> app can talk
> together but the question is how create and read/write with the new
> *entry*?
Hum, no, I think these two methods are to start and stop being a
alive BMidiEndpoint in the midi_server endpoints roster.
Again, it's only my guest, but I think that at start up midi_server
instantiate a internal class of a BMidiEndpoint (both producer and consumer)
for each /dev/midi/* entry succesfully opened and add them to his endpoints
roster. That's for the *real* midi endpoints (or ports, as they were named
before in old midi kit).
The [Un]Register() methods allow any instance of a BMidiEndpoint living outside
the midi_server, like a software midi synth or a userland midi driver (like
the USB midi device driver on BeBits), to be added/removed dynamicly from the
midi_server endpoints roster.
That's the great addition of MidiKit2 : all apps can publish and share their
own midi endpoints (consumer, producer or both). The midi_server and
his /dev/midi/* endpoints do it himself, but he's not the only one that could
do it anymore...
My bet is that BMidiEndpoint::[Un]Register() in turn call the
BMidiRoster::[Un]Register(this);. I bet that the tricky part of the midikit2 is
in BMidiRoster and the protocol it use to talk with the midi_server.
The hard part of the midi_kit (2 only?) would be the midi_server, no?
Or did I miss something here?
Did someone run a "nm midi_server" to get some hint on how this server works
(and his internal design), yet?.
-Philippe, always a "how works MidiKit2" guesser ;-)
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