[Icecast] Re: [Icecast-dev] Synchronize listeners
Geoff at QuiteLikely.com
Thu Sep 20 10:48:49 UTC 2007
Ross Levis wrote:
> Is it at all possible to synchronize listeners so they hear the audio at the
> exact same time? It doesn't matter if the source and listener is a few
> seconds different.
I was thinking about this one. It occurs to me that ogg bitstreams contain
timing data (similar to timecode). You could develop a player that used
this ogg-based timecode in conjunction with accurate PC clocks to develop
some kind of sync protocol (matching ogg timestamps to time-of-day). I
guess you would have to have a master/slave setup where one system was
authoritative and others would sync to it. I guess you could also have
mechanisms where the master was declared unsound if say it lost the stream,
and another master would be "elected" or something.
The parallels I see here are the ways that MIDI sequencers and audio
devices can sync with SMPTE et al. It's used in video too I think.
Of course, you would have to have accurate time, but NTP is capable of very
good time-keeping. YOu'd also have to be able to ensure the same latancy
for the actual playing of the audio... but that's more complex than I'm
qualified to speculate on.
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