81064cc239
We don't use that info for anything, and it generates unnecessary diffs every time we bump the minor version (and CI failures if we forget to sync some files from opt-in modules (mono, text_server_fb).
209 lines
12 KiB
XML
209 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="WebRTCPeerConnection" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
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<brief_description>
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Interface to a WebRTC peer connection.
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</brief_description>
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<description>
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A WebRTC connection between the local computer and a remote peer. Provides an interface to connect, maintain and monitor the connection.
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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:
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- The peer that wants to initiate the connection ([code]A[/code] from now on) creates an offer and send it to the other peer ([code]B[/code] from now on).
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- [code]B[/code] receives the offer, generate and answer, and sends it to [code]A[/code]).
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- [code]A[/code] and [code]B[/code] then generates and exchange ICE candidates with each other.
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After these steps, the connection should become connected. Keep on reading or look into the tutorial for more information.
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="add_ice_candidate">
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<return type="int" enum="Error" />
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<param index="0" name="media" type="String" />
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<param index="1" name="index" type="int" />
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<param index="2" name="name" type="String" />
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<description>
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Add an ice candidate generated by a remote peer (and received over the signaling server). See [signal ice_candidate_created].
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</description>
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</method>
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<method name="close">
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<return type="void" />
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<description>
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Close the peer connection and all data channels associated with it.
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[b]Note:[/b] You cannot reuse this object for a new connection unless you call [method initialize].
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</description>
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</method>
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<method name="create_data_channel">
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<return type="WebRTCDataChannel" />
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<param index="0" name="label" type="String" />
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<param index="1" name="options" type="Dictionary" default="{}" />
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<description>
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Returns a new [WebRTCDataChannel] (or [code]null[/code] on failure) with given [param label] and optionally configured via the [param options] dictionary. This method can only be called when the connection is in state [constant STATE_NEW].
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There are two ways to create a working data channel: either call [method create_data_channel] on only one of the peer and listen to [signal data_channel_received] on the other, or call [method create_data_channel] on both peers, with the same values, and the [code]"negotiated"[/code] option set to [code]true[/code].
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Valid [param options] are:
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[codeblock]
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{
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"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.
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"id": 1, # When "negotiated" is true this value must also be set to the same value on both peer.
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# Only one of maxRetransmits and maxPacketLifeTime can be specified, not both. They make the channel unreliable (but also better at real time).
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"maxRetransmits": 1, # Specify the maximum number of attempt the peer will make to retransmits packets if they are not acknowledged.
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"maxPacketLifeTime": 100, # Specify the maximum amount of time before giving up retransmitions of unacknowledged packets (in milliseconds).
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"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.
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"protocol": "my-custom-protocol", # A custom sub-protocol string for this channel.
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}
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[/codeblock]
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[b]Note:[/b] You must keep a reference to channels created this way, or it will be closed.
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</description>
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</method>
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<method name="create_offer">
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<return type="int" enum="Error" />
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<description>
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Creates a new SDP offer to start a WebRTC connection with a remote peer. At least one [WebRTCDataChannel] must have been created before calling this method.
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If this functions returns [constant OK], [signal session_description_created] will be called when the session is ready to be sent.
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</description>
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</method>
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<method name="get_connection_state" qualifiers="const">
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<return type="int" enum="WebRTCPeerConnection.ConnectionState" />
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<description>
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Returns the connection state. See [enum ConnectionState].
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</description>
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</method>
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<method name="get_gathering_state" qualifiers="const">
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<return type="int" enum="WebRTCPeerConnection.GatheringState" />
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<description>
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Returns the ICE [enum GatheringState] of the connection. This lets you detect, for example, when collection of ICE candidates has finished.
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</description>
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</method>
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<method name="get_signaling_state" qualifiers="const">
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<return type="int" enum="WebRTCPeerConnection.SignalingState" />
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<description>
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Returns the [enum SignalingState] on the local end of the connection while connecting or reconnecting to another peer.
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</description>
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</method>
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<method name="initialize">
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<return type="int" enum="Error" />
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<param index="0" name="configuration" type="Dictionary" default="{}" />
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<description>
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Re-initialize this peer connection, closing any previously active connection, and going back to state [constant STATE_NEW]. A dictionary of [param configuration] options can be passed to configure the peer connection.
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Valid [param configuration] options are:
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[codeblock]
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{
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"iceServers": [
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{
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"urls": [ "stun:stun.example.com:3478" ], # One or more STUN servers.
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},
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{
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"urls": [ "turn:turn.example.com:3478" ], # One or more TURN servers.
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"username": "a_username", # Optional username for the TURN server.
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"credential": "a_password", # Optional password for the TURN server.
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}
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]
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}
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[/codeblock]
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</description>
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</method>
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<method name="poll">
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<return type="int" enum="Error" />
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<description>
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Call this method frequently (e.g. in [method Node._process] or [method Node._physics_process]) to properly receive signals.
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</description>
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</method>
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<method name="set_default_extension" qualifiers="static">
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<return type="void" />
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<param index="0" name="extension_class" type="StringName" />
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<description>
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Sets the [param extension_class] as the default [WebRTCPeerConnectionExtension] returned when creating a new [WebRTCPeerConnection].
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</description>
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</method>
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<method name="set_local_description">
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<return type="int" enum="Error" />
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<param index="0" name="type" type="String" />
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<param index="1" name="sdp" type="String" />
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<description>
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Sets the SDP description of the local peer. This should be called in response to [signal session_description_created].
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After calling this function the peer will start emitting [signal ice_candidate_created] (unless an [enum Error] different from [constant OK] is returned).
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</description>
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</method>
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<method name="set_remote_description">
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<return type="int" enum="Error" />
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<param index="0" name="type" type="String" />
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<param index="1" name="sdp" type="String" />
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<description>
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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.
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If [param type] is [code]"offer"[/code] the peer will emit [signal session_description_created] with the appropriate answer.
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If [param type] is [code]"answer"[/code] the peer will start emitting [signal ice_candidate_created].
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</description>
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</method>
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</methods>
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<signals>
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<signal name="data_channel_received">
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<param index="0" name="channel" type="WebRTCDataChannel" />
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<description>
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Emitted when a new in-band channel is received, i.e. when the channel was created with [code]negotiated: false[/code] (default).
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The object will be an instance of [WebRTCDataChannel]. You must keep a reference of it or it will be closed automatically. See [method create_data_channel].
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</description>
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</signal>
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<signal name="ice_candidate_created">
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<param index="0" name="media" type="String" />
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<param index="1" name="index" type="int" />
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<param index="2" name="name" type="String" />
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<description>
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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.
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</description>
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</signal>
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<signal name="session_description_created">
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<param index="0" name="type" type="String" />
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<param index="1" name="sdp" type="String" />
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<description>
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Emitted after a successful call to [method create_offer] or [method set_remote_description] (when it generates an answer). The parameters are meant to be passed to [method set_local_description] on this object, and sent to the remote peer over the signaling server.
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</description>
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</signal>
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</signals>
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<constants>
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<constant name="STATE_NEW" value="0" enum="ConnectionState">
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The connection is new, data channels and an offer can be created in this state.
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</constant>
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<constant name="STATE_CONNECTING" value="1" enum="ConnectionState">
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The peer is connecting, ICE is in progress, none of the transports has failed.
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</constant>
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<constant name="STATE_CONNECTED" value="2" enum="ConnectionState">
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The peer is connected, all ICE transports are connected.
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</constant>
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<constant name="STATE_DISCONNECTED" value="3" enum="ConnectionState">
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At least one ICE transport is disconnected.
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</constant>
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<constant name="STATE_FAILED" value="4" enum="ConnectionState">
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One or more of the ICE transports failed.
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</constant>
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<constant name="STATE_CLOSED" value="5" enum="ConnectionState">
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The peer connection is closed (after calling [method close] for example).
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</constant>
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<constant name="GATHERING_STATE_NEW" value="0" enum="GatheringState">
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The peer connection was just created and hasn't done any networking yet.
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</constant>
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<constant name="GATHERING_STATE_GATHERING" value="1" enum="GatheringState">
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The ICE agent is in the process of gathering candidates for the connection.
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</constant>
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<constant name="GATHERING_STATE_COMPLETE" value="2" enum="GatheringState">
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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.
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</constant>
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<constant name="SIGNALING_STATE_STABLE" value="0" enum="SignalingState">
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There is no ongoing exchange of offer and answer underway. This may mean that the [WebRTCPeerConnection] is new ([constant STATE_NEW]) or that negotiation is complete and a connection has been established ([constant STATE_CONNECTED]).
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</constant>
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<constant name="SIGNALING_STATE_HAVE_LOCAL_OFFER" value="1" enum="SignalingState">
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The local peer has called [method set_local_description], passing in SDP representing an offer (usually created by calling [method create_offer]), and the offer has been applied successfully.
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</constant>
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<constant name="SIGNALING_STATE_HAVE_REMOTE_OFFER" value="2" enum="SignalingState">
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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 [method set_remote_description].
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</constant>
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<constant name="SIGNALING_STATE_HAVE_LOCAL_PRANSWER" value="3" enum="SignalingState">
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The offer sent by the remote peer has been applied and an answer has been created and applied by calling [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.
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</constant>
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<constant name="SIGNALING_STATE_HAVE_REMOTE_PRANSWER" value="4" enum="SignalingState">
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A provisional answer has been received and successfully applied in response to an offer previously sent and established by calling [method set_local_description].
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</constant>
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<constant name="SIGNALING_STATE_CLOSED" value="5" enum="SignalingState">
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The [WebRTCPeerConnection] has been closed.
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</constant>
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</constants>
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</class>
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