(portmidibackend.c:143-147): The PortMIDI backend was treating "no MIDI output
device" as a fatal error and destroying the entire backend, even when an input
device was successfully opened.
This works on Windows apparently because windows has a default MIDI synth, but
a Linux system doesn't, I guess.
Also, in audiointerface.c:229: The have_midi() function was checking the wrong
condition.
The following allows MIDI input to work, independently of MIDI output device...
This works (compiled) :
diff --git a/src/audio/portmidibackend.c b/src/audio/portmidibackend.c
index bc7b332..f69c8aa 100644
--- a/src/audio/portmidibackend.c
+++ b/src/audio/portmidibackend.c
@ -142,19 +142,19 @@ portmidi_initialize (DenemoPrefs * config)
info = Pm_GetDeviceInfo (id);
if (info == NULL)
{
- g_warning ("No output device");
- portmidi_destroy ();
- return -1;
+ g_message ("No MIDI output device available, continuing with input
only");
+ output_stream = NULL;
}
-
- g_message ("Opening output device '%s: %s'", info->interf, info->name);
-
- err = Pm_OpenOutput (&output_stream, id, NULL, OUTPUT_BUFFER_SIZE, NULL,
NULL, 0);
- if (err != pmNoError)
+ else
{
- g_warning ("Couldn't open output stream");
- portmidi_destroy ();
- return -1;
+ g_message ("Opening output device '%s: %s'", info->interf,
info->name);
+
+ err = Pm_OpenOutput (&output_stream, id, NULL, OUTPUT_BUFFER_SIZE,
NULL, NULL, 0);
+ if (err != pmNoError)
+ {
+ g_warning ("Couldn't open output stream, continuing with input
only");
+ output_stream = NULL;
+ }
}
}
else
-------- additionally ---------------------
diff --git a/src/audio/audiointerface.c b/src/audio/audiointerface.c
index 26e5415..9fa5b6f 100644
--- a/src/audio/audiointerface.c
+++ b/src/audio/audiointerface.c
@@ -226,7 +226,7 @@ initialize_midi (DenemoPrefs * config)
gboolean
have_midi (void)
{
- return strcmp (Denemo.prefs.portmidi_input_device->str, "default") &&
(backends[MIDI_BACKEND] != &dummy_midi_backend);
+ return strcmp (Denemo.prefs.portmidi_input_device->str, "none") != 0 &&
(backends[MIDI_BACKEND] != &dummy_midi_backend);
}
int
> On 10/13/2025 6:01 PM EDT Bric <[email protected]> wrote:
>
>
> > On 10/12/2025 3:25 AM EDT Andreas Schneider <[email protected]> wrote:
> >
> >
> > Compiling in JACK support adds a new MIDI backend, yet it is only used
> > if you select it as MIDI backend in the settings dialog under the MIDI
> > tab. The default backend is still PortMidi even if JACK support is
> > compiled in.
> > I also had the strange effect that MIDI input did not work at first
> > after updating my distribution and recompiling Denemo, however, when
> > trying again the next day it worked. I'm not sure why. Maybe the device
> > was already in use by another process. That happened to me with audio
> > output. Thus, it is worth to retry under Linux and check that the device
> > is not in direct use by some other process (i.e. not via the sound server).
> >
> > Andreas
> >
>
> Well, the bizarre thing, again, is that Denemo on my Ubuntu **IS** detecting
> the input keyboard! It is showing up, listed, under
>
> Edit -> Change Preference -> MIDI -> Input device
>
> But nothing happens when I actually send the MIDI signal.
