Using Externals

The problem is that fiddle~ is not a built-in object of Pd but an external, i.e., a shared library that Pd will load as needed. This poses two problems for us. By itself, libpd does not provide a shared library for fiddle~, and even if it did, we wouldn’t be able to use it here because iOS does not allow dynamic loading of shared libraries.

Fortunately, there is a simple solution. First, we need to add the external to our project, either as source code or as a static library. For the fiddle~ external, we find the source code in libpd/pure-data/extra/fiddle~/fiddle~.c and add it to the group that contains our app delegate and view controller (Figure 6-13).