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godot-docs/classes/class_webrtcpeerconnection.rst
Godot Organization c39e8f8635 classref: Sync with current 4.0 branch (cfedb0a)
2023-07-24 10:19:37 +00:00

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.. DO NOT EDIT THIS FILE!!!
.. Generated automatically from Godot engine sources.
.. Generator: https://github.com/godotengine/godot/tree/4.0/doc/tools/make_rst.py.
.. XML source: https://github.com/godotengine/godot/tree/4.0/modules/webrtc/doc_classes/WebRTCPeerConnection.xml.
.. _class_WebRTCPeerConnection:
WebRTCPeerConnection
====================
**Inherits:** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
**Inherited By:** :ref:`WebRTCPeerConnectionExtension<class_WebRTCPeerConnectionExtension>`
Interface to a WebRTC peer connection.
.. rst-class:: classref-introduction-group
Description
-----------
A WebRTC connection between the local computer and a remote peer. Provides an interface to connect, maintain and monitor the connection.
Setting up a WebRTC connection between two peers from now on) may not seem a trivial task, but it can be broken down into 3 main steps:
- The peer that wants to initiate the connection (``A`` from now on) creates an offer and send it to the other peer (``B`` from now on).
- ``B`` receives the offer, generate and answer, and sends it to ``A``).
- ``A`` and ``B`` then generates and exchange ICE candidates with each other.
After these steps, the connection should become connected. Keep on reading or look into the tutorial for more information.
.. rst-class:: classref-reftable-group
Methods
-------
.. table::
:widths: auto
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`add_ice_candidate<class_WebRTCPeerConnection_method_add_ice_candidate>` **(** :ref:`String<class_String>` media, :ref:`int<class_int>` index, :ref:`String<class_String>` name **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void | :ref:`close<class_WebRTCPeerConnection_method_close>` **(** **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`WebRTCDataChannel<class_WebRTCDataChannel>` | :ref:`create_data_channel<class_WebRTCPeerConnection_method_create_data_channel>` **(** :ref:`String<class_String>` label, :ref:`Dictionary<class_Dictionary>` options={} **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`create_offer<class_WebRTCPeerConnection_method_create_offer>` **(** **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` | :ref:`get_connection_state<class_WebRTCPeerConnection_method_get_connection_state>` **(** **)** |const| |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` | :ref:`get_gathering_state<class_WebRTCPeerConnection_method_get_gathering_state>` **(** **)** |const| |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` | :ref:`get_signaling_state<class_WebRTCPeerConnection_method_get_signaling_state>` **(** **)** |const| |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`initialize<class_WebRTCPeerConnection_method_initialize>` **(** :ref:`Dictionary<class_Dictionary>` configuration={} **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`poll<class_WebRTCPeerConnection_method_poll>` **(** **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void | :ref:`set_default_extension<class_WebRTCPeerConnection_method_set_default_extension>` **(** :ref:`StringName<class_StringName>` extension_class **)** |static| |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`set_local_description<class_WebRTCPeerConnection_method_set_local_description>` **(** :ref:`String<class_String>` type, :ref:`String<class_String>` sdp **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`set_remote_description<class_WebRTCPeerConnection_method_set_remote_description>` **(** :ref:`String<class_String>` type, :ref:`String<class_String>` sdp **)** |
+-------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
.. rst-class:: classref-section-separator
----
.. rst-class:: classref-descriptions-group
Signals
-------
.. _class_WebRTCPeerConnection_signal_data_channel_received:
.. rst-class:: classref-signal
**data_channel_received** **(** :ref:`WebRTCDataChannel<class_WebRTCDataChannel>` channel **)**
Emitted when a new in-band channel is received, i.e. when the channel was created with ``negotiated: false`` (default).
The object will be an instance of :ref:`WebRTCDataChannel<class_WebRTCDataChannel>`. You must keep a reference of it or it will be closed automatically. See :ref:`create_data_channel<class_WebRTCPeerConnection_method_create_data_channel>`.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_signal_ice_candidate_created:
.. rst-class:: classref-signal
**ice_candidate_created** **(** :ref:`String<class_String>` media, :ref:`int<class_int>` index, :ref:`String<class_String>` name **)**
Emitted when a new ICE candidate has been created. The three parameters are meant to be passed to the remote peer over the signaling server.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_signal_session_description_created:
.. rst-class:: classref-signal
**session_description_created** **(** :ref:`String<class_String>` type, :ref:`String<class_String>` sdp **)**
Emitted after a successful call to :ref:`create_offer<class_WebRTCPeerConnection_method_create_offer>` or :ref:`set_remote_description<class_WebRTCPeerConnection_method_set_remote_description>` (when it generates an answer). The parameters are meant to be passed to :ref:`set_local_description<class_WebRTCPeerConnection_method_set_local_description>` on this object, and sent to the remote peer over the signaling server.
.. rst-class:: classref-section-separator
----
.. rst-class:: classref-descriptions-group
Enumerations
------------
.. _enum_WebRTCPeerConnection_ConnectionState:
.. rst-class:: classref-enumeration
enum **ConnectionState**:
.. _class_WebRTCPeerConnection_constant_STATE_NEW:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_NEW** = ``0``
The connection is new, data channels and an offer can be created in this state.
.. _class_WebRTCPeerConnection_constant_STATE_CONNECTING:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_CONNECTING** = ``1``
The peer is connecting, ICE is in progress, none of the transports has failed.
.. _class_WebRTCPeerConnection_constant_STATE_CONNECTED:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_CONNECTED** = ``2``
The peer is connected, all ICE transports are connected.
.. _class_WebRTCPeerConnection_constant_STATE_DISCONNECTED:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_DISCONNECTED** = ``3``
At least one ICE transport is disconnected.
.. _class_WebRTCPeerConnection_constant_STATE_FAILED:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_FAILED** = ``4``
One or more of the ICE transports failed.
.. _class_WebRTCPeerConnection_constant_STATE_CLOSED:
.. rst-class:: classref-enumeration-constant
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **STATE_CLOSED** = ``5``
The peer connection is closed (after calling :ref:`close<class_WebRTCPeerConnection_method_close>` for example).
.. rst-class:: classref-item-separator
----
.. _enum_WebRTCPeerConnection_GatheringState:
.. rst-class:: classref-enumeration
enum **GatheringState**:
.. _class_WebRTCPeerConnection_constant_GATHERING_STATE_NEW:
.. rst-class:: classref-enumeration-constant
:ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` **GATHERING_STATE_NEW** = ``0``
The peer connection was just created and hasn't done any networking yet.
.. _class_WebRTCPeerConnection_constant_GATHERING_STATE_GATHERING:
.. rst-class:: classref-enumeration-constant
:ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` **GATHERING_STATE_GATHERING** = ``1``
The ICE agent is in the process of gathering candidates for the connection.
.. _class_WebRTCPeerConnection_constant_GATHERING_STATE_COMPLETE:
.. rst-class:: classref-enumeration-constant
:ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` **GATHERING_STATE_COMPLETE** = ``2``
The ICE agent has finished gathering candidates. If something happens that requires collecting new candidates, such as a new interface being added or the addition of a new ICE server, the state will revert to gathering to gather those candidates.
.. rst-class:: classref-item-separator
----
.. _enum_WebRTCPeerConnection_SignalingState:
.. rst-class:: classref-enumeration
enum **SignalingState**:
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_STABLE:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_STABLE** = ``0``
There is no ongoing exchange of offer and answer underway. This may mean that the **WebRTCPeerConnection** is new (:ref:`STATE_NEW<class_WebRTCPeerConnection_constant_STATE_NEW>`) or that negotiation is complete and a connection has been established (:ref:`STATE_CONNECTED<class_WebRTCPeerConnection_constant_STATE_CONNECTED>`).
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_HAVE_LOCAL_OFFER:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_HAVE_LOCAL_OFFER** = ``1``
The local peer has called :ref:`set_local_description<class_WebRTCPeerConnection_method_set_local_description>`, passing in SDP representing an offer (usually created by calling :ref:`create_offer<class_WebRTCPeerConnection_method_create_offer>`), and the offer has been applied successfully.
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_HAVE_REMOTE_OFFER:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_HAVE_REMOTE_OFFER** = ``2``
The remote peer has created an offer and used the signaling server to deliver it to the local peer, which has set the offer as the remote description by calling :ref:`set_remote_description<class_WebRTCPeerConnection_method_set_remote_description>`.
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_HAVE_LOCAL_PRANSWER:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_HAVE_LOCAL_PRANSWER** = ``3``
The offer sent by the remote peer has been applied and an answer has been created and applied by calling :ref:`set_local_description<class_WebRTCPeerConnection_method_set_local_description>`. This provisional answer describes the supported media formats and so forth, but may not have a complete set of ICE candidates included. Further candidates will be delivered separately later.
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_HAVE_REMOTE_PRANSWER:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_HAVE_REMOTE_PRANSWER** = ``4``
A provisional answer has been received and successfully applied in response to an offer previously sent and established by calling :ref:`set_local_description<class_WebRTCPeerConnection_method_set_local_description>`.
.. _class_WebRTCPeerConnection_constant_SIGNALING_STATE_CLOSED:
.. rst-class:: classref-enumeration-constant
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **SIGNALING_STATE_CLOSED** = ``5``
The **WebRTCPeerConnection** has been closed.
.. rst-class:: classref-section-separator
----
.. rst-class:: classref-descriptions-group
Method Descriptions
-------------------
.. _class_WebRTCPeerConnection_method_add_ice_candidate:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **add_ice_candidate** **(** :ref:`String<class_String>` media, :ref:`int<class_int>` index, :ref:`String<class_String>` name **)**
Add an ice candidate generated by a remote peer (and received over the signaling server). See :ref:`ice_candidate_created<class_WebRTCPeerConnection_signal_ice_candidate_created>`.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_close:
.. rst-class:: classref-method
void **close** **(** **)**
Close the peer connection and all data channels associated with it.
\ **Note:** You cannot reuse this object for a new connection unless you call :ref:`initialize<class_WebRTCPeerConnection_method_initialize>`.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_create_data_channel:
.. rst-class:: classref-method
:ref:`WebRTCDataChannel<class_WebRTCDataChannel>` **create_data_channel** **(** :ref:`String<class_String>` label, :ref:`Dictionary<class_Dictionary>` options={} **)**
Returns a new :ref:`WebRTCDataChannel<class_WebRTCDataChannel>` (or ``null`` on failure) with given ``label`` and optionally configured via the ``options`` dictionary. This method can only be called when the connection is in state :ref:`STATE_NEW<class_WebRTCPeerConnection_constant_STATE_NEW>`.
There are two ways to create a working data channel: either call :ref:`create_data_channel<class_WebRTCPeerConnection_method_create_data_channel>` on only one of the peer and listen to :ref:`data_channel_received<class_WebRTCPeerConnection_signal_data_channel_received>` on the other, or call :ref:`create_data_channel<class_WebRTCPeerConnection_method_create_data_channel>` on both peers, with the same values, and the ``"negotiated"`` option set to ``true``.
Valid ``options`` are:
::
{
"negotiated": true, # When set to true (default off), means the channel is negotiated out of band. "id" must be set too. "data_channel_received" will not be called.
"id": 1, # When "negotiated" is true this value must also be set to the same value on both peer.
# Only one of maxRetransmits and maxPacketLifeTime can be specified, not both. They make the channel unreliable (but also better at real time).
"maxRetransmits": 1, # Specify the maximum number of attempt the peer will make to retransmits packets if they are not acknowledged.
"maxPacketLifeTime": 100, # Specify the maximum amount of time before giving up retransmitions of unacknowledged packets (in milliseconds).
"ordered": true, # When in unreliable mode (i.e. either "maxRetransmits" or "maxPacketLifetime" is set), "ordered" (true by default) specify if packet ordering is to be enforced.
"protocol": "my-custom-protocol", # A custom sub-protocol string for this channel.
}
\ **Note:** You must keep a reference to channels created this way, or it will be closed.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_create_offer:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **create_offer** **(** **)**
Creates a new SDP offer to start a WebRTC connection with a remote peer. At least one :ref:`WebRTCDataChannel<class_WebRTCDataChannel>` must have been created before calling this method.
If this functions returns :ref:`@GlobalScope.OK<class_@GlobalScope_constant_OK>`, :ref:`session_description_created<class_WebRTCPeerConnection_signal_session_description_created>` will be called when the session is ready to be sent.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_get_connection_state:
.. rst-class:: classref-method
:ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>` **get_connection_state** **(** **)** |const|
Returns the connection state. See :ref:`ConnectionState<enum_WebRTCPeerConnection_ConnectionState>`.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_get_gathering_state:
.. rst-class:: classref-method
:ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` **get_gathering_state** **(** **)** |const|
Returns the ICE :ref:`GatheringState<enum_WebRTCPeerConnection_GatheringState>` of the connection. This lets you detect, for example, when collection of ICE candidates has finished.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_get_signaling_state:
.. rst-class:: classref-method
:ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` **get_signaling_state** **(** **)** |const|
Returns the :ref:`SignalingState<enum_WebRTCPeerConnection_SignalingState>` on the local end of the connection while connecting or reconnecting to another peer.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_initialize:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **initialize** **(** :ref:`Dictionary<class_Dictionary>` configuration={} **)**
Re-initialize this peer connection, closing any previously active connection, and going back to state :ref:`STATE_NEW<class_WebRTCPeerConnection_constant_STATE_NEW>`. A dictionary of ``configuration`` options can be passed to configure the peer connection.
Valid ``configuration`` options are:
::
{
"iceServers": [
{
"urls": [ "stun:stun.example.com:3478" ], # One or more STUN servers.
},
{
"urls": [ "turn:turn.example.com:3478" ], # One or more TURN servers.
"username": "a_username", # Optional username for the TURN server.
"credential": "a_password", # Optional password for the TURN server.
}
]
}
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_poll:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **poll** **(** **)**
Call this method frequently (e.g. in :ref:`Node._process<class_Node_method__process>` or :ref:`Node._physics_process<class_Node_method__physics_process>`) to properly receive signals.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_set_default_extension:
.. rst-class:: classref-method
void **set_default_extension** **(** :ref:`StringName<class_StringName>` extension_class **)** |static|
Sets the ``extension_class`` as the default :ref:`WebRTCPeerConnectionExtension<class_WebRTCPeerConnectionExtension>` returned when creating a new **WebRTCPeerConnection**.
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_set_local_description:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **set_local_description** **(** :ref:`String<class_String>` type, :ref:`String<class_String>` sdp **)**
Sets the SDP description of the local peer. This should be called in response to :ref:`session_description_created<class_WebRTCPeerConnection_signal_session_description_created>`.
After calling this function the peer will start emitting :ref:`ice_candidate_created<class_WebRTCPeerConnection_signal_ice_candidate_created>` (unless an :ref:`Error<enum_@GlobalScope_Error>` different from :ref:`@GlobalScope.OK<class_@GlobalScope_constant_OK>` is returned).
.. rst-class:: classref-item-separator
----
.. _class_WebRTCPeerConnection_method_set_remote_description:
.. rst-class:: classref-method
:ref:`Error<enum_@GlobalScope_Error>` **set_remote_description** **(** :ref:`String<class_String>` type, :ref:`String<class_String>` sdp **)**
Sets the SDP description of the remote peer. This should be called with the values generated by a remote peer and received over the signaling server.
If ``type`` is ``"offer"`` the peer will emit :ref:`session_description_created<class_WebRTCPeerConnection_signal_session_description_created>` with the appropriate answer.
If ``type`` is ``"answer"`` the peer will start emitting :ref:`ice_candidate_created<class_WebRTCPeerConnection_signal_ice_candidate_created>`.
.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
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