tree e5d8e113363a48b9098f6101bff96155dbcdcea5
parent 9a1f62923e69e43f140616937e92046b76a99138
author Mathieu Duponchelle <mathieu@centricular.com> 1524493961 +0200
committer Mathieu Duponchelle <mathieu@centricular.com> 1524496902 +0200

audioaggregator: fix filtered getcaps

In the situation described in
https://bugzilla.gnome.org/show_bug.cgi?id=795397,

downstream_caps consists of two structures, the first with
the preferred rate, if at all possible (44100), the second
containing the full range of allowed rates, as audioresample
correctly tries to negotiate passthrough caps.

As audioaggregator cannot perform rate conversion, it wants
to return a fixated rate in its getcaps implementation,
however it previously directly used the first structure in
the caps allowed downstream, without taking the filter into
consideration, to determine the rate to fixate to.

With this, we first intersect our downstream caps with the
filter, in order not to fixate to an unsupported rate.