opening rawmidi on user ports

opening rawmidi on user ports

[AlGrenadine]

Hi,
I use btmidi-server from the bluez stack, which creates user ports to 
send and receive midi via bluetooth.
I can't manager which parameter string i must provide to 
snd_rawmidi_open function, can you help ?

(of course the user ports don't appear in amidi -l)
I only have a client and port ids (128:0) when using aconnect -l

Thanks

Re: opening rawmidi on user ports

[Takashi Sakamoto]

Hi,

On Tue, Mar 12, 2019 at 05:19:38PM +0100, AlGrenadine wrote:
> I use btmidi-server from the bluez stack, which creates user ports to send
> and receive midi via bluetooth.
> I can't manager which parameter string i must provide to snd_rawmidi_open
> function, can you help ?
> 
> (of course the user ports don't appear in amidi -l)
> I only have a client and port ids (128:0) when using aconnect -l

As long as reading code of 'btmidi-server'[1], it uses ALSA sequencer
interface. You need to use ALSA sequencer APIs instead of ALSA rawmidi
APIs. Some tools will assist your work; 'aseqdump' and 'aplaymidi' in
'alsa-utils' repository[2].

[1] https://github.com/oxesoft/bluez/blob/midi/tools/btmidi-server.c
[2] https://git.alsa-project.org/?p=alsa-utils.git

Regards

Takashi Sakamoto

Re: opening rawmidi on user ports

[Clemens Ladisch]

AlGrenadine wrote:
> I use btmidi-server from the bluez stack, which creates user ports to send and receive midi via bluetooth.
> I can't manager which parameter string i must provide to snd_rawmidi_open function, can you help ?

Load the snd-virmidi module to get a bridge between raw MIDI ports and sequencer ports.


Regards,
Clemens

Re: opening rawmidi on user ports

[Clemens Ladisch]

AlGrenadine wrote:
> it seems ALSA seq looses sysex messages. Is there a buffer size which can be set ?

Messages from where to where?  Can you check with aseqdump or "amidi --dump"?

Messages that are too large for the internal buffer are split into multiple parts.


Regards,
Clemens

Re: opening rawmidi on user ports

[Clemens Ladisch]

AlGrenadine wrote:
> Le 13/03/2019 à 14:37, Clemens Ladisch a écrit :
>> Load the snd-virmidi module to get a bridge between raw MIDI ports and sequencer ports.
>
> Ok then what would be the snd_rawmidi_open argument for name of virmidi port ?

See "amidi -l".


Regards,
Clemens
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