"MidiPortGlue" missing

[Pete]

In BeOS, an old-style BMidiPort appears (by default) to apps which use the new MidiKit as an endpoint named "MidiPortGlue". In Haiku this doesn't happen. SqueekySynth in particular uses such a port for MIDI input, so there's no way to drive it in Haiku, though it appears to work otherwise.

I'm attaching a bare-bones test app that simply creates a MidiPort and then hangs around until dismissed. Run it under BeOS, and PatchBay immediately shows the associated Midi2 endpoints. Do the same under Haiku (either the BeOS executable or recompiled) and no endpoints are shown.

[Pete]

Test app to create a BMidiPort

[jackburton]

I had a (very brief) look at the BMidiPort code, and it seems it correctly creates an endpoint called MidiPortGlue, so in theory it should work. I guess something goes wrong on the way.

[jackburton]

Maybe I'm missing something but... are hardware drivers required in order to be able to open a midi port ? If so, that's the problem, I guess. We have no midi hardware drivers in haiku.

[korli]

Replying to jackburton:

Maybe I'm missing something but... are hardware drivers required in order to be able to open a midi port ? If so, that's the problem, I guess. We have no midi hardware drivers in haiku.

I see at least usb_midi as a midi hardware driver.

[Pete]

It looks like the reason is pretty simple: the "MidiPortGlue" endpoints are never registered!

I added the following lines in the constructor in BMidiPort.cpp, line 32:

    BMidiRoster::Register(fLocalSource);
    BMidiRoster::Register(fLocalSink);

[Easier for me than entering a patch for just two lines... Sorry about the spaces for tabs.]

Now the ports appear in PatchBay as they should, and SqueekySynth appears to be working (if only the audio on my machine wasn't being balky at the moment (:-/)

[Pete]

Replying to jackburton:

Maybe I'm missing something but... are hardware drivers required in order to be able to open a midi port ? If so, that's the problem, I guess. We have no midi hardware drivers in haiku.

Well I'm happily using my MIDI-USB link in Haiku... (:-)) (and the Glue endpoints should appear the moment the port is created -- it doesn't have to be connected to any hardware.)

[korli]

Committed in hrev36019. I added Unregister calls.