[Bug 794257] audiomixer: Negotiation failure when input has several channels (> 2)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794257

--- Comment #1 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 369579
  --> https://bugzilla.gnome.org/attachment.cgi?id=369579&action=edit
audioaggregator: fix channel-mask negotiation

When outputting more than two channels, a channel-mask has to be
specified in the output caps.

We follow the same heuristic as other cases, when downstream
does not specify a channel-mask, we use that of the first
configured pad, and if there was none we generate a fallback
mask.

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