I've gone a bit further and handled sequences of (de)crescendi, to an extent.
I plan to test my work before posting a review, but here is the algorithm in
case anyone would like to raise objections in the meantime.
The performer works on passages containing of the longest string of consecutive
crescendi followed by a consecutive decrescendi (or vice versa) which are not
interrupted by an absolute dynamic. For example, this passage has two
crescendi and a decrescendo, as well as some spans of unchanging volume.
c\< c\! c c c\< c\! c c c\> c c c c c c c\! ...
The performer works it out so that at the end of the decrescendo, the volume
has returned to the original volume before the first crescendo in the passasge
began. The maximum (or minimum) volume is chosen as it was before. The change
in volume of a particular (de)crescendo is proportional to its duration.
When an absolute dynamic appears, the performer terminates the group and uses
the specified dynamic instead of the starting dynamic.
---
** [issues:#4048] Is Dynamic_performer’s understanding of (de)crescendo too
limited?**
**Status:** Accepted
**Created:** Sat Aug 02, 2014 10:45 AM UTC by Anonymous
**Last Updated:** Sun Jun 05, 2016 01:27 PM UTC
**Owner:** Dan Eble
*Originally created by:* *anonymous
*Originally created by:*
[[email protected]](http://code.google.com/u/115988136766997056421/)
On 02/08/14 18:36, Knute Snortum wrote:> Something that is seen a lot in 19th
and 20th century music is a crescendo
> or decrescendo without going to a specific dynamic. The performer is given
> the freedom to decide how much to change the dynamics. This causes an
> error message: "programming error: Impossible or ambiguous \(de\)crescendo in
> MIDI."
>
> %%% BEGIN
> \version "2.19.10"
>
> \score \{
> \relative c' \{
> c1 \p | c4 \< d e f | g \> f e d | c1 \p
> \}
> \layout \{\}
> \midi \{\}
> \}
> %%% END
>
> This error message should be a warning and give some line number to the
> offending code.
On 02/08/14 15:28, David Kastrup wrote:> Knute Snortum <[email protected]>
writes:
...
>
> That's not an actual programming error in pretty much all cases but
> rather an input problem probably deserving a warning. That alone should
> warrant fixing.
>
---
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