Re: [Denemo-devel] dynamics

[Richard Shann]

I've put a sample menu item (Markings->Text
Markings->Dynamics->Fortissimo) into git. There is some work to be done
on positioning the FF sign relative to the chord, but it will do to
start work on the MIDI.
The script is this:

;;;Fortissimo
(d-DirectivePut-chord-graphic "Dynamic"  "Fortissimo" )
(d-DirectivePut-chord-gx "Dynamic"  -10)
(d-DirectivePut-chord-gy "Dynamic"  30)
(d-DirectivePut-chord-postfix "Dynamic"  "\\ff")
(d-DirectivePut-chord-minpixels  "Dynamic" 20)
(d-RefreshDisplay)

It's very basic - we would want to add a script
actions/editscripts/Dynamics.scm to allow the dynamic to be changed
easily etc. But it provides a place to put a line
(d-DirectivePut-chord-midivolume "Dynamics" 10) or whatever it is we
need.
Looking purely at the handling of dynamics in exportmidi.c that you have
just checked in, it would seem that you just need a int field to
announce a volume to set. Then we would do a function call
set_volume(curchord->directives, &cur_volume) to put any new value that
may be set in any of the directives into cur_volume.
*HOWEVER* give some thought to what are the range of things you might
want to announce to the exportmidi code from a directive, and see how
they may be bundled up. For example, I imagine a crescendo will be one
of these, so a single step change in volume would better be represented
as a special sort of crescendo; then we don't have more fields and more
special code than we need. 
The crescendo is a case where we may want open/close directives: I have
proposed to cater for this explicitly only for standalone directives: if
we want the dynamics to be attached to a chord (it is probably best)
then we need to re-visit the open/close issue - no code has been written
around this yet.
What other sorts of things does MIDI want to know about as the music
goes along (tempo changes evidently ...)?
Richard


On Wed, 2009-03-25 at 08:29 -0500, Jeremiah Benham wrote:
> On Wed, 2009-03-25 at 09:44 +0000, Richard Shann wrote:
> > On Tue, 2009-03-24 at 15:00 +0000, Richard Shann wrote:
> > > I don't know what exactly you would be storing as MIDI information, it
> > > would be a good idea to bounce the possible fields and their names
> > > back
> > > and forth a bit. 
> > Also we will need to coordinate changes, as I am currently working
> > through adding the keysig directives and timesig directives. I could do
> > adding the MIDI fields to the DenemoDirective structure (and then the
> > code for them in view.c, imp/exportxml.c lilydirectives.c), while
> > Jeremiah could add the actions to take in exportmidi.c
> 
> Ok. This sounds good. I will need you to point me to an example because
> I am very behind on this directive stuff.
> 
> Jeremiah
> 
> 
> > Richard
> > 
> > 
> > 
> > 
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