PtpClock
Added in version 1.6.
Superclasses: SystemClock, Clock, Object, InitiallyUnowned, Object
GstPtpClock implements a PTP (IEEE1588:2008) ordinary clock in slave-only mode, that allows a GStreamer pipeline to synchronize to a PTP network clock in some specific domain.
The PTP subsystem can be initialized with ptp_init(), which then starts
a helper process to do the actual communication via the PTP ports. This is
required as PTP listens on ports < 1024 and thus requires special
privileges. Once this helper process is started, the main process will
synchronize to all PTP domains that are detected on the selected
interfaces.
new() then allows to create a GstClock that provides the PTP
time from a master clock inside a specific PTP domain. This clock will only
return valid timestamps once the timestamps in the PTP domain are known. To
check this, you can use wait_for_sync(), the GstClock::synced
signal and is_synced().
To gather statistics about the PTP clock synchronization,
ptp_statistics_callback_add() can be used. This gives the application
the possibility to collect all kinds of statistics from the clock
synchronization.
Constructors
- class PtpClock
- classmethod new(name: str, domain: int) Clock
Creates a new PTP clock instance that exports the PTP time of the master clock in
domain. This clock can be slaved to other clocks as needed.If
ptp_init()was not called before, this will callptp_init()with default parameters.This clock only returns valid timestamps after it received the first times from the PTP master clock on the network. Once this happens the GstPtpClock::internal-clock property will become non-NULL. You can check this with
wait_for_sync(), the GstClock::synced signal andis_synced().Added in version 1.6.
- Parameters:
name – Name of the clock
domain – PTP domain