Re: calculation of the total duration of a score

[Marc Hohl]

Hi Jan-Peter,

ok, so I played around with your engraver. It does exactly what it needs 
to do, but somehow I am not able to get everything to work.

I'll try to explain:

Let's say that I have some music:

music = {
 ...stuff...
 \repeat volta 2 { ... more stuff ... }
}

and want it displayed nicely:

\score {
  \new Staff { \music }
}

If I include your engraver here, the calculated time is wrong, because 
the repeats are not taken into account.

So I go for the midi-block

\score {
  \new Staff { \unfoldRepeats \music }
  \midi {
     \context {
        \Score
        \consists ...your code here ...
     }
   }
}


But it looks like the duration variable is visible within its score 
only, see the attached compilable example.

How can I obtain the correct duration in combination with a compact score?

Thanks in advance,

Marc
Am 13.09.2016 um 10:24 schrieb Jan-Peter Voigt:
> Hi Marc,
>
> you already received some solutions, but I stumbled across this thread
> and just want to quickly show my engraver - perhaps it also helps.
>
> It doesn't read repeats right now, but this may be solved with
> \unfoldRepeats and the engraver placed in the midi-block.
> The duration-markup-command relies on a global variable and a delayed
> stencil - this will not work with multiple scores, as only the duration
> of the last score will be displayed. But that is manageable, if needed.
>
> HTH
> Jan-Peter
>
> Am 05.09.2016 um 11:01 schrieb Marc Hohl:
> > Hi list,
> >
> > I have a couple of songs in my latest theatre project. It would be nice
> > to have something like "duration: 3'22''" at the end of each song.
> >
> > Doing this by hand is straightforward:I generate a midi file that sounds
> > accurate and let it play by timidity – but IMHO it would be less tedious
> > and less error-prone if lilypond were capable of doing these
> > calculations itself.
> >
> > Tempo indications and meter changes have to be taken into account, so
> > this is probably doable with a special engraver only IIUC.
> >
> > Has someone else already done something like this? I have no experience
> > in writing scheme engravers, so any hint would be highly appreciated.
> >
> > Thanks in advance,
> >
> > Marc
> >
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>
>
>
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