The big news is that Version 3.1 brings two new backends offering native *BSD support and synchronised PulseAudio support. Additionally it contains new optional loudness and convolution filters, improvements in non-synchronised backends, enhancements, stability improvements and bug fixes.
sndiobackend gives Shairport Sync native fully synchronised output on OpenBSD and FreeBSD, thanks to the work of Tobias Kortkamp (t6).
pabackend now allows Shairport Sync to provide synchronised output on PulseAudio-equipped systems (many desktop Linuxes use PulseAudio as their sound manager).
- Optional loudness and convolution filters can be incorporated in the audio processing chain, thanks to the fantastic work of yannpom.
- A volume-change program hook
run_this_when_volume_is_sethas been added to the
generalsettings stanza to execute an application whenever the volume is changed.
Pesky Changes You Should Know About
audio_backend_latency_offset_in_secondssettings have been moved from individual backend stanzas to the
generalstanza. They now have an effect on every type of backend.
- If you are using a System V (aka
systemv) installation, please note that the default location for PID file has moved -- it is now stored at
/var/run/shairport-sync/shairport-sync.pid. This change is needed to improve security a little and to improve compatability across platforms. If you're not doing anything strange, this should make no difference.
- Resynchronisation, which happens when the synchronisation is incorrect by more than 50 ms by default, should be a lot less intrusive when it occurs – it should now either insert silence or skip frames, as appropriate.
- The Linux installer has been improved and simplified and a FreeBSD installer introduced.
- A new setting,
audio_backend_silent_lead_in_time, allows you to set the duration of the period of silence played (the "silent lead-in") before a play session starts.
- A new command-line option,
--logOutputLevel, allows you to output the volume levels to the log whenever they are changed. This may be useful during setup.
- Improvements have been made to the handling of large items of metadata over UDP.
- A new command line option,
-j, demonizes Shairport Sync without creating a PID file.
- A new
mute_using_playback_switch, is available for advanced use.
- Other minor enhancements.
- Stability improvements. More care has been taken (!) to make code thread-safe, resulting in improved stability.
- Conversion from stereo to mono has been fixed to avoid clipping while preserving full resolution. Thanks to Robert Jones (RobDeBagel) for bringing this to notice.
- Short intrusions of audio at the start of a new session from the end of the previous session have been eliminated.
- Many (many!) miscellaneous bugs fixed.