Re: calculation of the total duration of a score

[Marc Hohl]

Hi Jan-Peter,

Am 14.09.2016 um 13:18 schrieb Jan-Peter Voigt:
> Hi Marc,
>
> I am busy today, so I will look into your example later.

No problem!

> In short: Repeats are not taken into account right now.

Yes. Therefore I used the \unfoldRepeats/\midi-combination, but the
duration computed in one \score is not visible in the other one.

I thought of writing the duration to a external file to be read from
within the markup call in the score to be printed, but did not follow
this route any further yet.

> I thought of a factor, that is set, when a repeat starts. But I don't
> know yet, how to deal with alternatives and repeats with more than
> two loops. Probably the engraver might look for barlines. Still it
> needs to recognize alternatives with its possible repetitions (e.g.
> 1-3).

I don't know whether it is doable to implement the stuff that
\unfoldRepeats does within the engraver. Detecting the beginning and the
end of a repeated section should not be that hard, but the bookkeeping
is probably tricky in terms of alternatives, as you pointed out.
> We'll crack that nut :-)

Sounds probising, thank you very much!

Marc

> Jan-Peter
>
> Am 14. September 2016 12:03:43 MESZ, schrieb Marc Hohl
> <address@hidden>:
>
> 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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