Re: [Denemo-devel] jack midi input

[Richard Shann]

On Fri, 2008-10-31 at 23:43 -0500, Jeremiah Benham wrote:
> On Fri, 2008-10-31 at 16:50 +0000, Richard Shann wrote:
> > On Fri, 2008-10-31 at 09:33 -0500, Jeremiah Benham wrote:
> > > ok. I first I want to thank Nils for suggesting I look at jack
> midi
> > > input. After looking at a few examples I quickly had denemo
> accepting
> > > midi input via jack. 
> > Great! Did you already manage to wire this in to the function
> > pitchentry() in the file pitchentry.c? One of the things this will
> get
> > you is the enharmonic control (whether Eb or D# is meant when the
> midi
> > pitch comes in).
> 
> No, I have held off on that. When I wrote something similar to this in
> the past I did it in a very low level way. This is not the approach I
> want and was unsure of what functions I should be using. At the moment
> it just prints the int midi note number(60 = mid c, 61 = c#/Db, 62 = e
> etc...) to the terminal. pitchentry()? are you sure. I read through
> that
> function and was wondering if that is really what you mean. I am not
> sure how to interface it with this function.
What you will need is to put

if(jack)
        get_midi_note();
else
        get_note();

in place of the get_note(), which is getting a note from audio. It
returns the note as a double Hz value.
The boolean jack could be passed in. Looking at this code, I see it
needs re-writing since we have moved to Denemo.gui as global rather than
allowing separate top level windows with their own menus & callbacks.
Ideally we will factorize this code starting from
start_pitch_recognition() which starts up a timer to collect pitches. If
you would like, you could check in (d-JackMidi) and I can modify
pitchentry.c to call it & put in the menu item to start it up. 

>  I can convert the midi note
> numbers to hz. 
so this would be get_midi_note() as above
> Could I just use enter_note_in_score?  
You could, but would then miss things that are common to midi entry and
audio entry. There are things in audio entry that are irrelevant to midi
entry, but that is what factorization is all about.
Richard