Re: calculation of the total duration of a score

[Marc Hohl]

Hi Paul,

thanks for the file. It lookes quite promising, but a quick test shows 
some strange numbers I do not understand:

test.ly ---

\version "2.19.47"

\include "grob-meta-data-engraver.ily"

\score {
  \new Staff {
     \tempo 4 = 60
     \repeat unfold 60 c'4
   }
   \layout { }
   \midi { }
 }

Processing this file yields to:

GNU LilyPond 2.19.48
»test.ly« wird verarbeitet
Analysieren...
Interpretation der Musik...[8][16][16]3.75
Vorverarbeitung der grafischen Elemente...
Interpretation der Musik...
MIDI-Ausgabe nach »test.midi«...
Ideale Seitenanzahl wird gefunden...
Musik wird auf eine Seite angepasst...
Systeme erstellen...
Layout nach »/tmp/lilypond-pgKSZe« ausgeben...
Konvertierung nach »test.pdf«...
Löschen von »/tmp/lilypond-pgKSZe«...
Kompilation erfolgreich beendet

address@hidden ~/engraver$ timidity test.midi
Playing test.midi
MIDI file: test.midi
Format: 1  Tracks: 2  Divisions: 384
Sequence:
Text: creator:
Text: GNU LilyPond 2.19.48
Playing time: ~64 seconds
Notes cut: 0
Notes lost totally: 0

It shows a duration of 3.75 in line 4.

A timidity call plays the file in about 64 seconds
(even strange, 60 notes with tempo 4 = 60 should have a total duration 
of 60 seconds).

What does 3.75 mean?

Marc


Am 08.09.2016 um 05:39 schrieb Paul:
> On 09/05/2016 05:01 AM, Marc Hohl wrote:
>
> > Has someone else already done something like this? I have no experience
> > in writing scheme engravers, so any hint would be highly appreciated.
>
> lilypond-html-live-score does something like this by post-processing an
> SVG with python to add meta data to the grobs in the SVG file:
> https://gitlab.com/sigmate/lilypond-html-live-score/blob/master/make-live-score#L88
>
>
> I was working on porting part of that to scheme so it could be done
> directly.  I've attached my include file.  It will currently display the
> total duration to the log.  It could be simplified in various ways if it
> was calculating just the total duration and not adding timing info to
> every grob.
>
> It's still a work in progress and only lightly tested.
>
> -Paul
>
>
>
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