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Update BUILDFORAP2.md

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Mike Brady
2021-07-08 11:59:07 +01:00
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BUILDFORAP2.md
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@@ -5,8 +5,7 @@ Build Instructions for AirPlay 2
* Be especially careful with audio systems capable of very high volume output -- the volume control in this software may not be reliable!
* For now, leave the settings in the configuration file at default except as noted below.
* At the time of writing, May 2, 2021, everything is on the latest version of the software -- macOS 11.3, iOS 14.5, Raspberry Pi OS 5.10.17-v7l+ (Buster), Ubuntu 20.04 -- fully updated.
* Shairport Sync relies on a program called [`nqptp`](https://github.com/mikebrady/nqptp) to monitor timing signals. This program uses ports 319 and 320 and replaces any PTP service you have on the computer.
In addition, `nqptp` must run with `root` privileges.
* Shairport Sync relies on a program called [`nqptp`](https://github.com/mikebrady/nqptp) to monitor timing signals. This program uses ports 319 and 320 and replaces any PTP service you have on the computer.
(FYI, most computers do not have a PTP clock running. They often use a (totally different) [Network Timing Protocol (NTP)](http://www.ntp.org) service to keep the system clock synchronised with world time.)
* Shairport Sync has a build dependency on `nqptp`, so you should build or update `nqptp` *before* building or updating Shairport Sync.
* The POSIX Shared Memory Interface (SMI) Version numbers of `nqptp` and Shairport Sync must match. If they don't, you'll get a message in the logs. It means that one of the programs is out of date with respect to the other.