[PD-dev] how to get correct sample rate in an external object, even when overlap?

[katja]

Hello,

An external that I'm working on needs to know sample rate. Member s_sr
of struct t_signal is normally used for the purpose, but this value
isn't representative in a subpatch with overlap because it gives the
total rate for the overlapping signal vectors. My external is
specifically meant to work with use-case-dependent block size, overlap
and downsampling, that's why I care.

I know there's a feature request from 2005 about adding an 'overlap'
member in the t_signal struct
(https://sourceforge.net/p/pure-data/feature-requests/16/). That never
happened - you can't add a member to a struct in a stable API, can
you?

Is there a workaround? The [samplerate~] object does it correctly, but
uses functions / data types which aren't part of the API, or which are
even local to the file (d_ugen.c). Could anyone think of another
approach?

Katja