ActiveAE: Wait at least c_retry * 1500
ActiveAE: fix downmix for the case a sink returns more channels than requested
Merge pull request #4239 from FernetMenta/active

ActiveAE: fix downmix for the case a sink returns more channels than req...
Merge pull request #4238 from fritsch/ae-extend-init

ActiveAE: Wait at least c_retry * 1500