audiodecoder: add API for setting caps on the source pad.

4 jobs for master in 1 minute and 41 seconds
Status Job ID Name Coverage
  Manifest
passed manifest #43622

00:00:21

 
  Build
passed build fedora x86_64 #43672

00:01:19

failed build fedora x86_64 #43667

00:02:26

failed build fedora x86_64 #43623

01:53:53