GstNet.PtpClock

g GObject.InitiallyUnowned GObject.InitiallyUnowned Gst.Object Gst.Object GObject.InitiallyUnowned->Gst.Object GObject.Object GObject.Object GObject.Object->GObject.InitiallyUnowned Gst.Clock Gst.Clock Gst.SystemClock Gst.SystemClock Gst.Clock->Gst.SystemClock Gst.Object->Gst.Clock GstNet.PtpClock GstNet.PtpClock Gst.SystemClock->GstNet.PtpClock

Subclasses:None

Virtual Methods

Inherited:Gst.Clock (6), Gst.Object (1), GObject.Object (7)

Properties

Inherited:Gst.SystemClock (1), Gst.Clock (3), Gst.Object (2)
Name Type Flags Short Description
domain int r/w/co The PTP domain
grandmaster-clock-id int r Grand Master Clock ID
internal-clock Gst.Clock r Internal clock
master-clock-id int r Master Clock ID

Fields

Inherited:Gst.Clock (1), Gst.Object (1), GObject.Object (1)
Name Type Access Description
clock Gst.SystemClock r  

Class Details

class GstNet.PtpClock(**kwargs)
Bases:Gst.SystemClock
Abstract:No
Structure:GstNet.PtpClockClass

GstNet.PtpClock 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 GstNet.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.

GstNet.PtpClock.new() then allows to create a Gst.Clock 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 Gst.Clock.wait_for_sync(), the Gst.Clock ::synced signal and Gst.Clock.is_synced().

To gather statistics about the PTP clock synchronization, GstNet.ptp_statistics_callback_add() can be used. This gives the application the possibility to collect all kinds of statistics from the clock synchronization.

New in version 1.6.

classmethod new(name, domain)[source]
Parameters:
  • name (str) – Name of the clock
  • domain (int) – PTP domain
Returns:

A new Gst.Clock

Return type:

Gst.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 GstNet.ptp_init() was not called before, this will call GstNet.ptp_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 GstNet.PtpClock ::internal-clock property will become non-None. You can check this with Gst.Clock.wait_for_sync(), the Gst.Clock ::synced signal and Gst.Clock.is_synced().

New in version 1.6.

Property Details

GstNet.PtpClock.props.domain
Name:domain
Type:int
Default Value:0
Flags:READABLE, WRITABLE, CONSTRUCT_ONLY

The PTP domain

GstNet.PtpClock.props.grandmaster_clock_id
Name:grandmaster-clock-id
Type:int
Default Value:0
Flags:READABLE

Grand Master Clock ID

GstNet.PtpClock.props.internal_clock
Name:internal-clock
Type:Gst.Clock
Default Value:None
Flags:READABLE

Internal clock

GstNet.PtpClock.props.master_clock_id
Name:master-clock-id
Type:int
Default Value:0
Flags:READABLE

Master Clock ID