• Sebastian Dröge's avatar
    ptp: Initial implementation of a PTP clock · 8d777598
    Sebastian Dröge authored
    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 gst_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.
    gst_ptp_clock_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, the GstPtpClock::internal-clock property and
    the related notify::clock signal can be used. Once the internal clock
    is not NULL, the PTP domain's time is known. Alternatively you can wait
    for this with gst_ptp_clock_wait_ready().
    To gather statistics about the PTP clock synchronization,
    gst_ptp_statistics_callback_add() can be used. This gives the
    application the possibility to collect all kinds of statistics
    from the clock synchronization.
configure.ac 35.6 KB