Linux plugin only returns Virtual MIDI ports

[kratib]

Using Jazz-Plugin v1.5 on Ubuntu 16.04 with Linux kernel 4.4.0-57-lowlatency (64 bits). Jazz-Plugin is installed on Firefox 50.1.0.

Going to this page: http://cwilso.github.io/WebMIDIAPIShim/ ... t_devices/ shows different results under FF + Jazz-Plugin, versus Chrome (with native Web MIDI API support). Specifically, it seems that Jazz-Plugin only picks up the ALSA MIDI ports that are created by `snd-virmidi` kernel module. This is further evidenced by your page http://jazz-soft.net/demo/Connected.html which only shows such ports. Chrome, on the other hand, shows all ALSA MIDI ports including those created by TiMidity, FLUID Synth, in addition to the MIDI Through Ports that are created by `snd-seq-dummy` kernel module.

Am I correctly interpreting the behaviour of Jazz-Plugin? Is there a way to have it sense the other ports too?

Thanks!

[sema]

Current version of Jazz-Plugin sees only ALSA MIDI ports.
This may be helpful: http://jazz-soft.net/download/Jazz-Plug ... Synth.html

[kratib]

Thanks for your reply. I had already followed the instructions on the Linux setup page, but that's not what I am asking about. Sorry if I was not clear.

When I use Chrome's native Web MIDI API, it returns all ALSA MIDI ports, including MIDI Through ports and the TiMidity ports.

When I use Jazz-Plugin on Firefox, it ONLY returns Virtual MIDI ports (from `snd-virmidi` kernel module). It does NOT return MIDI Through ports and the TiMidity ports.

[sema]

Jazz-Plugin excludes the MIDI-Through from the list. Do you think those are of any use for web applications?
About the TiMidity ports - does aconnect -lo see them?

[kratib]

In my use case, I need MIDI-Through because I am sending my web app's MIDI messages to the MIDI input of another web app, using MIDI-Through as channel.

Here's the output of aconnect -lo

Code: Select all

client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
   Connecting To: 128:0
   Connected From: 129:0
    1 'Midi Through Port-1'
   Connecting To: 128:0
   Connected From: 129:1
    2 'Midi Through Port-2'
   Connecting To: 128:0
   Connected From: 129:2
    3 'Midi Through Port-3'
   Connecting To: 128:0
   Connected From: 129:3
client 130: 'TiMidity' [type=user]
    0 'TiMidity port 0 '
   Connected From: 129:4
    1 'TiMidity port 1 '
   Connected From: 129:5
    2 'TiMidity port 2 '
   Connected From: 129:6
    3 'TiMidity port 3 '
   Connected From: 129:7


Attached is what Jazz-Plugin 1.5 finds.

[sema]

Will post the new Linux version with enabled MIDI-Thru shortly...

[kratib]

Thank you!

Regarding the missing TiMidity ports, I guess the solution is to route them through Virtual MIDI ports as explained in your Linux installation guide?