The size of the packets sent between network clocks. #GstNetAddressMeta can be used to store a network address (a #GSocketAddress) in a #GstBuffer so that it network elements can track the to and from address of the buffer. the parent type a #GSocketAddress stored as metadata #GstNetClientClock implements a custom #GstClock that synchronizes its time to a remote time provider such as #GstNetTimeProvider. #GstNtpClock implements a #GstClock that synchronizes its time to a remote NTPv4 server. A new clock is created with gst_net_client_clock_new() or gst_ntp_clock_new(), which takes the address and port of the remote time provider along with a name and an initial time. This clock will poll the time provider and will update its calibration parameters based on the local and remote observations. The "round-trip" property limits the maximum round trip packets can take. Various parameters of the clock can be configured with the parent #GstClock "timeout", "window-size" and "window-threshold" object properties. A #GstNetClientClock and #GstNtpClock is typically set on a #GstPipeline with gst_pipeline_use_clock(). If you set a #GstBus on the clock via the "bus" object property, it will send @GST_MESSAGE_ELEMENT messages with an attached #GstStructure containing statistics about clock accuracy and network traffic. Create a new #GstNetClientInternalClock that will report the time provided by the #GstNetTimeProvider on @remote_address and @remote_port. a new #GstClock that receives a time from the remote clock. a name for the clock the address or hostname of the remote clock provider the port of the remote clock provider initial time of the clock #GstNetControlMessageMeta can be used to store control messages (ancillary data) which was received with or is to be sent alongside the buffer data. When used with socket sinks and sources which understand this meta it allows sending and receiving ancillary data such as unix credentials (See #GUnixCredentialsMessage) and Unix file descriptions (See #GUnixFDMessage). the parent type a #GSocketControlMessage stored as metadata Various functions for receiving, sending an serializing #GstNetTimePacket structures. the local time when this packet was sent the remote time observation Creates a new #GstNetTimePacket from a buffer received over the network. The caller is responsible for ensuring that @buffer is at least #GST_NET_TIME_PACKET_SIZE bytes long. If @buffer is %NULL, the local and remote times will be set to #GST_CLOCK_TIME_NONE. MT safe. Caller owns return value (gst_net_time_packet_free to free). The new #GstNetTimePacket. a buffer from which to construct the packet, or NULL Make a copy of @packet. a copy of @packet, free with gst_net_time_packet_free(). the #GstNetTimePacket Free @packet. the #GstNetTimePacket Sends a #GstNetTimePacket over a socket. MT safe. TRUE if successful, FALSE in case an error occurred. the #GstNetTimePacket to send socket to send the time packet on address to send the time packet to Serialized a #GstNetTimePacket into a newly-allocated sequence of #GST_NET_TIME_PACKET_SIZE bytes, in network byte order. The value returned is suitable for passing to write(2) or sendto(2) for communication over the network. MT safe. Caller owns return value (g_free to free). A newly allocated sequence of #GST_NET_TIME_PACKET_SIZE bytes. the #GstNetTimePacket Receives a #GstNetTimePacket over a socket. Handles interrupted system calls, but otherwise returns NULL on error. a new #GstNetTimePacket, or NULL on error. Free with gst_net_time_packet_free() when done. socket to receive the time packet on address of variable to return sender address This object exposes the time of a #GstClock on the network. A #GstNetTimeProvider is created with gst_net_time_provider_new() which takes a #GstClock, an address and a port number as arguments. After creating the object, a client clock such as #GstNetClientClock can query the exposed clock over the network for its values. The #GstNetTimeProvider typically wraps the clock used by a #GstPipeline. Allows network clients to get the current time of @clock. the new #GstNetTimeProvider, or NULL on error a #GstClock to export over the network an address to bind on as a dotted quad (xxx.xxx.xxx.xxx), IPv6 address, or NULL to bind to all addresses a port to bind on, or 0 to let the kernel choose Create a new #GstNtpClock that will report the time provided by the NTPv4 server on @remote_address and @remote_port. a new #GstClock that receives a time from the remote clock. a name for the clock the address or hostname of the remote clock provider the port of the remote clock provider initial time of the clock PTP clock identification that can be passed to gst_ptp_init() to automatically select one based on the MAC address of interfaces 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, you can use gst_clock_wait_for_sync(), the GstClock::synced signal and gst_clock_is_synced(). 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. 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 gst_ptp_init() was not called before, this will call gst_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 GstPtpClock::internal-clock property will become non-NULL. You can check this with gst_clock_wait_for_sync(), the GstClock::synced signal and gst_clock_is_synced(). A new #GstClock Name of the clock PTP domain Opaque #GstPtpClockClass structure. parented to #GstSystemClockClass The statistics can be the following structures: GST_PTP_STATISTICS_NEW_DOMAIN_FOUND: "domain" G_TYPE_UINT The domain identifier of the domain "clock" GST_TYPE_CLOCK The internal clock that is slaved to the PTP domain GST_PTP_STATISTICS_BEST_MASTER_CLOCK_SELECTED: "domain" G_TYPE_UINT The domain identifier of the domain "master-clock-id" G_TYPE_UINT64 PTP clock identifier of the selected master clock "master-clock-port" G_TYPE_UINT PTP port number of the selected master clock "grandmaster-clock-id" G_TYPE_UINT64 PTP clock identifier of the grandmaster clock GST_PTP_STATISTICS_PATH_DELAY_MEASURED: "domain" G_TYPE_UINT The domain identifier of the domain "mean-path-delay-avg" GST_TYPE_CLOCK_TIME Average mean path delay "mean-path-delay" GST_TYPE_CLOCK_TIME Latest mean path delay "delay-request-delay" GST_TYPE_CLOCK_TIME Delay of DELAY_REQ / DELAY_RESP messages GST_PTP_STATISTICS_TIME_UPDATED: "domain" G_TYPE_UINT The domain identifier of the domain "mean-path-delay-avg" GST_TYPE_CLOCK_TIME Average mean path delay "local-time" GST_TYPE_CLOCK_TIME Local time that corresponds to ptp-time "ptp-time" GST_TYPE_CLOCK_TIME Newly measured PTP time at local-time "estimated-ptp-time" GST_TYPE_CLOCK_TIME Estimated PTP time based on previous measurements "discontinuity" G_TYPE_INT64 Difference between estimated and measured PTP time "synced" G_TYPE_BOOLEAN Currently synced to the remote clock "r-squared" G_TYPE_DOUBLE R² of clock estimation regression "internal-time" GST_TYPE_CLOCK_TIME Internal time clock parameter "external-time" GST_TYPE_CLOCK_TIME External time clock parameter "rate-num" G_TYPE_UINT64 Internal/external rate numerator "rate-den" G_TYPE_UINT64 Internal/external rate denominator "rate" G_TYPE_DOUBLE Internal/external rate If %FALSE is returned, the callback is removed and never called again. PTP domain identifier New statistics Data passed to gst_ptp_statistics_callback_add() Attaches @addr as metadata in a #GstNetAddressMeta to @buffer. a #GstNetAddressMeta connected to @buffer a #GstBuffer a @GSocketAddress to connect to @buffer Attaches @message as metadata in a #GstNetControlMessageMeta to @buffer. a #GstNetControlMessageMeta connected to @buffer a #GstBuffer a @GSocketControlMessage to attach to @buffer Find the #GstNetAddressMeta on @buffer. the #GstNetAddressMeta or %NULL when there is no such metadata on @buffer. a #GstBuffer Receives a #GstNetTimePacket over a socket. Handles interrupted system calls, but otherwise returns NULL on error. a new #GstNetTimePacket, or NULL on error. Free with gst_net_time_packet_free() when done. socket to receive the time packet on address of variable to return sender address Deinitialize the GStreamer PTP subsystem and stop the PTP clock. If there are any remaining GstPtpClock instances, they won't be further synchronized to the PTP network clock. Initialize the GStreamer PTP subsystem and create a PTP ordinary clock in slave-only mode for all domains on the given @interfaces with the given @clock_id. If @clock_id is %GST_PTP_CLOCK_ID_NONE, a clock id is automatically generated from the MAC address of the first network interface. This function is automatically called by gst_ptp_clock_new() with default parameters if it wasn't called before. %TRUE if the GStreamer PTP clock subsystem could be initialized. PTP clock id of this process' clock or %GST_PTP_CLOCK_ID_NONE network interfaces to run the clock on Check if the GStreamer PTP clock subsystem is initialized. %TRUE if the GStreamer PTP clock subsystem is intialized. Check if PTP clocks are generally supported on this system, and if previous initializations did not fail. %TRUE if PTP clocks are generally supported on this system, and previous initializations did not fail. Installs a new statistics callback for gathering PTP statistics. See GstPtpStatisticsCallback for a list of statistics that are provided. Id for the callback that can be passed to gst_ptp_statistics_callback_remove() GstPtpStatisticsCallback to call Data to pass to the callback GDestroyNotify to destroy the data Removes a PTP statistics callback that was previously added with gst_ptp_statistics_callback_add(). Callback id to remove