device->internal no longer available

Forwarded from debian http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=577400

Package: libao-dev Version: 1.0.0-3

In earlier versions of libao it was possible to write new plugins for it, using the interface described at doc/plugin-overview.html and doc/plugin-api.html.

However, the contents of the ao_device structure is no longer visible, so plugins that store their private data via device->internal can no longer be built. That would be fine if there was an alternative way to associated private data with an ao_device, but there isn't.

plugin-overview.html mentions a number of other fields of ao_device which plugins are expected to be able to access, e.g. driver_byte_format, but they are also invisible.