[LAU] Re: wnat a version of ttymidi that works with pipewire

On 30/08/2025 10:48, Bill Purvis wrote:
>
>
> On 30/08/2025 10:07, Bengt Gördén wrote:
>> On 8/29/25 17:50, Bill Purvis wrote:
>>> I've been using a modified version of ttymidi with fair success 
>>> while using JackD2, but have now migrated to
>>> using pipewire. Despite having pipewire-jack installed and working, 
>>> ttymidi no longer works with it.
>>
>> If it's modified, maybe the standard version is better to test? Out 
>> of curiosity, I downloaded the source code and compiled. Not that I 
>> have any MIDI stuff running on the serial port right now so I can't 
>> test it, but it shows up as alsa-midi in qpwgraph.
>>
>>         id 116, type PipeWire:Interface:Port/3
>>                 object.serial = "33446"
>>                 object.path = "alsa:seq:default:client_129:playback_1"
>>                 format.dsp = "8 bit raw midi"
>>                 node.id = "42"
>>                 port.id = "2"
>>                 port.name = "ttymidiMIDI in (playback)"
>>                 port.direction = "in"
>>                 port.alias = "ttymidi:MIDI in"
>>                 port.group = "client_129"
>>
>>         id 154, type PipeWire:Interface:Port/3
>>                 object.serial = "33445"
>>                 object.path = "alsa:seq:default:client_129:capture_0"
>>                 format.dsp = "8 bit raw midi"
>>                 node.id = "42"
>>                 port.id = "2"
>>                 port.name = "ttymidiMIDI out (capture)"
>>                 port.direction = "out"
>>                 port.alias = "ttymidi:MIDI out"
>>                 port.group = "client_129"
> Well, I have tweaked various bits to handle special cases - I use the 
> Arduinos as scanners in an organ, so I need to distinguish between
> them - no good connecting the pedal scanner to the tab stops! I do 
> this by identifying the channel on which they send - each has a dedicated
> channel,  and when first starting up it sends a dummy note-off with 
> note 0. The modified ttymidi opens the serial port, and reads the first
> event and decides from that what name to use when opening the jack 
> port. I've also cut out some of the more complex handling as the scanners
> only ever send note-on and note-off, apart from the swell pedal 
> scanner which send parameter-change events. No complications with 
> sysex request!
>
> I'll have to download the original version again, and see how it 
> behaves. I've got various keyboards etc. that I can use for initial 
> testing.
>
> Many thanks for your troubles on my behalf!
>
> Bill
That's very interesting - I did a google search for 'ttymidi source' and 
got a selection of hits. Downloaded one, compiled and tested it to
find it hits the same errors as mine. Searched further and try a 
different one, and that one seems to work.

The difference is: the one that works interfaces with libasound, rather 
than direct with jack. I doubt if libasound had been invented when I
downloaded the original ttymidi. Just need to familiarise myself with 
the libasound interface and fit my mods into this version.

The one that I downloaded and works is from:

     http://www.varal.org/ttymidi/

Chrome is a bit reluctant to download from a http source, but it seems 
to be OK. It's a tar.gz download, and comes with some arduino code as
well, which I have not explored. Anyone familiar with Midi and Arduinos 
will have no problem getting it all to work.

Many, many thanks!

Bill

-- 
+---------------------------------------------+
| Bill Purvis          G8DIO                  |
| [email protected]                              |
+---------------------------------------------+
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