Merge pull request #1 from alfredh/master

Upstream
Merge pull request #2 from alfredh/master

Merge Upstream
Merge pull request #3 from alfredh/master

audio: fix audio_srate range for G.722
Merge pull request #4 from alfredh/master

Merge upstream
opus fmtp config
Merge pull request #27 from studio-connect/opus_config

Opus config