multisocketsink

This plugin writes incoming data to a set of sockets. The sockets can be added to multisocketsink by emitting the GstMultiSocketSink::add signal. For each descriptor added, the GstMultiSocketSink::client-added signal will be called.

A client can also be added with the GstMultiSocketSink::add-full signal that allows for more control over what and how much data a client initially receives.

Clients can be removed from multisocketsink by emitting the GstMultiSocketSink::remove signal. For each descriptor removed, the GstMultiSocketSink::client-removed signal will be called. The GstMultiSocketSink::client-removed signal can also be fired when multisocketsink decides that a client is not active anymore or, depending on the value of the recover-policy property, if the client is reading too slowly. In all cases, multisocketsink will never close a socket itself. The user of multisocketsink is responsible for closing all sockets. This can for example be done in response to the GstMultiSocketSink::client-socket-removed signal. Note that multisocketsink still has a reference to the socket when the GstMultiSocketSink::client-removed signal is emitted, so that "get-stats" can be performed on the descriptor; it is therefore not safe to close the socket in the GstMultiSocketSink::client-removed signal handler, and you should use the GstMultiSocketSink::client-socket-removed signal to safely close the socket.

Multisocketsink internally keeps a queue of the incoming buffers and uses a separate thread to send the buffers to the clients. This ensures that no client write can block the pipeline and that clients can read with different speeds.

When adding a client to multisocketsink, the sync-method property will define which buffer in the queued buffers will be sent first to the client. Clients can be sent the most recent buffer (which might not be decodable by the client if it is not a keyframe), the next keyframe received in multisocketsink (which can take some time depending on the keyframe rate), or the last received keyframe (which will cause a simple burst-on-connect). Multisocketsink will always keep at least one keyframe in its internal buffers when the sync-mode is set to latest-keyframe.

There are additional values for the sync-method property to allow finer control over burst-on-connect behaviour. By selecting the 'burst' method a minimum burst size can be chosen, 'burst-keyframe' additionally requires that the burst begin with a keyframe, and 'burst-with-keyframe' attempts to burst beginning with a keyframe, but will prefer a minimum burst size even if it requires not starting with a keyframe.

Multisocketsink can be instructed to keep at least a minimum amount of data expressed in time or byte units in its internal queues with the time-min and bytes-min properties respectively. These properties are useful if the application adds clients with the GstMultiSocketSink::add-full signal to make sure that a burst connect can actually be honored.

When streaming data, clients are allowed to read at a different rate than the rate at which multisocketsink receives data. If the client is reading too fast, no data will be send to the client until multisocketsink receives more data. If the client, however, reads too slowly, data for that client will be queued up in multisocketsink. Two properties control the amount of data (buffers) that is queued in multisocketsink: buffers-max and buffers-soft-max. A client that falls behind by buffers-max is removed from multisocketsink forcibly.

A client with a lag of at least buffers-soft-max enters the recovery procedure which is controlled with the recover-policy property. A recover policy of NONE will do nothing, RESYNC_LATEST will send the most recently received buffer as the next buffer for the client, RESYNC_SOFT_LIMIT positions the client to the soft limit in the buffer queue and RESYNC_KEYFRAME positions the client at the most recent keyframe in the buffer queue.

multisocketsink will by default synchronize on the clock before serving the buffers to the clients. This behaviour can be disabled by setting the sync property to FALSE. Multisocketsink will by default not do QoS and will never drop late buffers.

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBaseSink
                    ╰──GstMultiHandleSink
                        ╰──multisocketsink

Factory details

Authors: – Thomas Vander Stichele , Wim Taymans , Sebastian Dröge

Classification:Sink/Network

Rank – none

Plugin – tcp

Package – GStreamer Base Plug-ins

Pad Templates

sink

ANY

Presencealways

Directionsink

Object typeGstPad


Signals

add

add_callback (GstElement * gstmultisocketsink,
              GSocket * socket,
              gpointer udata)
def add_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'add' signal
function add_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, udata: gpointer udata): {
    // javascript callback for the 'add' signal
}

Hand the given open socket to multisocketsink to write to.

Parameters:

gstmultisocketsink

the multisocketsink element to emit this signal on

socket

the socket to add to multisocketsink

udata
No description available

Flags: Run Last / Action


add-full

add_full_callback (GstElement * gstmultisocketsink,
                   GSocket * socket,
                   GstMultiHandleSinkSyncMethod * sync,
                   GstFormat * format_min,
                   guint64 value_min,
                   GstFormat * format_max,
                   guint64 value_max,
                   gpointer udata)
def add_full_callback (gstmultisocketsink, socket, sync, format_min, value_min, format_max, value_max, udata):
    #python callback for the 'add-full' signal
function add_full_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, sync: GstMultiHandleSinkSyncMethod * sync, format_min: GstFormat * format_min, value_min: guint64 value_min, format_max: GstFormat * format_max, value_max: guint64 value_max, udata: gpointer udata): {
    // javascript callback for the 'add-full' signal
}

Hand the given open socket to multisocketsink to write to and specify the burst parameters for the new connection.

Parameters:

gstmultisocketsink

the multisocketsink element to emit this signal on

socket

the socket to add to multisocketsink

sync

the sync method to use

format_min

the format of value_min

value_min

the minimum amount of data to burst expressed in format_min units.

format_max

the format of value_max

value_max

the maximum amount of data to burst expressed in format_max units.

udata
No description available

Flags: Run Last / Action


client-added

client_added_callback (GstElement * gstmultisocketsink,
                       GObject * socket,
                       gpointer udata)
def client_added_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'client-added' signal
function client_added_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GObject * socket, udata: gpointer udata): {
    // javascript callback for the 'client-added' signal
}

The given socket was added to multisocketsink. This signal will be emitted from the streaming thread so application should be prepared for that.

Parameters:

gstmultisocketsink

the multisocketsink element that emitted this signal

socket

the socket that was added to multisocketsink

udata
No description available

Flags: Run Last


client-removed

client_removed_callback (GstElement * gstmultisocketsink,
                         GSocket * socket,
                         GstMultiHandleSinkClientStatus * status,
                         gpointer udata)
def client_removed_callback (gstmultisocketsink, socket, status, udata):
    #python callback for the 'client-removed' signal
function client_removed_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, status: GstMultiHandleSinkClientStatus * status, udata: gpointer udata): {
    // javascript callback for the 'client-removed' signal
}

The given socket is about to be removed from multisocketsink. This signal will be emitted from the streaming thread so applications should be prepared for that.

gstmultisocketsink still holds a handle to socket so it is possible to call the get-stats signal from this callback. For the same reason it is not safe to close() and reuse socket in this callback.

Parameters:

gstmultisocketsink

the multisocketsink element that emitted this signal

socket

the socket that is to be removed from multisocketsink

status

the reason why the client was removed

udata
No description available

Flags: Run Last


client-socket-removed

client_socket_removed_callback (GstElement * gstmultisocketsink,
                                GSocket * socket,
                                gpointer udata)
def client_socket_removed_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'client-socket-removed' signal
function client_socket_removed_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, udata: gpointer udata): {
    // javascript callback for the 'client-socket-removed' signal
}

The given socket was removed from multisocketsink. This signal will be emitted from the streaming thread so applications should be prepared for that.

In this callback, gstmultisocketsink has removed all the information associated with socket and it is therefore not possible to call get-stats with socket. It is however safe to close() and reuse fd in the callback.

Parameters:

gstmultisocketsink

the multisocketsink element that emitted this signal

socket

the socket that was removed from multisocketsink

udata
No description available

Flags: Run Last


get-stats

GstStructure *
get_stats_callback (GstElement * gstmultisocketsink,
                    GSocket * socket,
                    gpointer udata)
def get_stats_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'get-stats' signal
function get_stats_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, udata: gpointer udata): {
    // javascript callback for the 'get-stats' signal
}

Get statistics about socket. This function returns a GstStructure.

Parameters:

gstmultisocketsink

the multisocketsink element to emit this signal on

socket

the socket to get stats of from multisocketsink

udata
No description available
Returns ( GstStructure * ) –

a GstStructure with the statistics. The structure contains values that represent: total number of bytes sent, time when the client was added, time when the client was disconnected/removed, time the client is/was active, last activity time (in epoch seconds), number of buffers dropped. All times are expressed in nanoseconds (GstClockTime).

Flags: Run Last / Action


remove

remove_callback (GstElement * gstmultisocketsink,
                 GSocket * socket,
                 gpointer udata)
def remove_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'remove' signal
function remove_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, udata: gpointer udata): {
    // javascript callback for the 'remove' signal
}

Remove the given open socket from multisocketsink.

Parameters:

gstmultisocketsink

the multisocketsink element to emit this signal on

socket

the socket to remove from multisocketsink

udata
No description available

Flags: Run Last / Action


remove-flush

remove_flush_callback (GstElement * gstmultisocketsink,
                       GSocket * socket,
                       gpointer udata)
def remove_flush_callback (gstmultisocketsink, socket, udata):
    #python callback for the 'remove-flush' signal
function remove_flush_callback(gstmultisocketsink: GstElement * gstmultisocketsink, socket: GSocket * socket, udata: gpointer udata): {
    // javascript callback for the 'remove-flush' signal
}

Remove the given open socket from multisocketsink after flushing all the pending data to the socket.

Parameters:

gstmultisocketsink

the multisocketsink element to emit this signal on

socket

the socket to remove from multisocketsink

udata
No description available

Flags: Run Last / Action


Properties

send-dispatched

“send-dispatched” gboolean

Sends a GstNetworkMessageDispatched event upstream whenever a buffer is sent to a client. The event is a CUSTOM event name GstNetworkMessageDispatched and contains:

"object" G_TYPE_OBJECT : the object identifying the client "buffer" GST_TYPE_BUFFER : the buffer sent to the client

Flags : Read / Write

Default value : false


send-messages

“send-messages” gboolean

Sends a GstNetworkMessage event upstream whenever a buffer is received from a client. The event is a CUSTOM event name GstNetworkMessage and contains:

"object" G_TYPE_OBJECT : the object identifying the client "buffer" GST_TYPE_BUFFER : the buffer with data received from the client

Flags : Read / Write

Default value : false


Named constants

GstMultiHandleSinkClientStatus

Members

ok (0) – ok
closed (1) – Closed
removed (2) – Removed
slow (3) – Too slow
error (4) – Error
duplicate (5) – Duplicate
flushing (6) – Flushing

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