RTCPeerConnection

초안: 이 문서는 작성중입니다.

RTCPeerConnection 인터페이스는 로컬 컴퓨터와 원격 피어 간의 WebRTC 연결을 담당하며 원격 피어에 연결하기 위한 메서드들을 제공하고, 연결을 유지하고 연결 상태를 모니터링하며 더 이상 연결이 필요하지 않을 경우 연결을 종료합니다.

사용되지 않는 메서드

다음 메서드는 오래 전부터 사용되지 않았으며 모든 주요 브라우저에서 구현되지 않았습니다.

RTCPeerConnection.createDTMFSender() This is an obsolete API and is no longer guaranteed to work.
특정 MediaStreamTrack와 관련된 신규 RTCDTMFSender (en-US)를 생성합니다. RTCDTMFSender (en-US)는 연결을 통해 DTMF (en-US) 전화 신호를 보낼 수 있습니다. 

이벤트

addEventListener()를 이용하여 아래 이벤트를 리스닝하거나 이 인터페이스의 oneventname 프로퍼티에 이벤트 리스너를 할당할 수 있습니다.

connectionstatechange (en-US)
RTCPeerConnection의 연결상태가 바뀌면, RTCPeerConnection 객체에 전달합니다. 이는 또한,  onconnectionstatechange 이벤트 핸들러 속성을 통해 사용이 가능합니다. 
datachannel (en-US)
원격 피어가 RTCDataChannel (en-US)을 연결에 추가하게되면 RTCPeerConnection 객체에 전달합니다. 이는 또한, ondatachannel 이벤트 핸들러 속성을 통해 사용이 가능합니다.
icecandidate (en-US)
특정 ICE candidate가 원격 피어에 전달되도록 피어 연결에 요청을 보냅니다. 또한, onicecandidate 이벤트 핸들러 속성을 통해 사용이 가능합니다.
icecandidateerror (en-US)
ICE candidate를 수집하는 과정에서 에러가 발생하면 연결에 RTCPeerConnectionIceErrorEvent (en-US) 에러 타입을 보냅니다. 이는 또한, onicecandidateerror (en-US) 이벤트 핸들러 속성을 통해 사용이 가능합니다.
iceconnectionstatechange (en-US)
연결이 끊기는 상황과 같이 ICE 연결의 상태가 변하게되면 RTCPeerConnection에 전달합니다. 이는 또한, oniceconnectionstatechange (en-US) 이벤트 핸들러 속성을 통해 사용이 가능합니다.
icegatheringstatechange
iceGatheringState에 의해 반영되는 ICE 계층의 수집 상태가 변하면, RTCPeerConnection에 전달합니다. 계층의 수집 상태는 ICE 네고시에이션이 아직 시작을 안했거나 (new), 시작하고 candidate를 수집하는 중이거나 (gathering), 혹은 수집이 완료 (complete)된 상태로 나눠집니다. 이는 또한, onicegatheringstatechange 이벤트 핸들러 속성을 통해 사용이 가능합니다.
isolationchange
연결과 관련이 있는 하나의 MediaStreamTrack 객체가 있는 isolated 속성의 값이 변하면, RTCPeerConnection에 전달합니다. 만약 미디어 컨텐츠가 인증이 되어있지 않거나, 트랙이 cross-origin source (CORS)에서 오는 것이라면 트랙의 상태는 isolated이 됩니다. 이는 또한, onisolationchange 이벤트 핸들러 속성을 통해 사용이 가능합니다.
negotiationneeded (en-US)
ICE 연결의 네고시에이션 혹은 네고시에이션을 다시 수행해야 할 때, RTCPeerConnection에 전달됩니다. 이는 연결이 처음 생성되는 순간뿐만아니라 네트워크 조건이 바뀌게 되면 발생합니다. 리시버는 offer를 생성하고, 이를 다른 피어에 전달하기위해 응답해야합니다. 이는 또한, onnegotiationneeded (en-US) 이벤트 핸들러 속성을 통해 사용이 가능합니다.
signalingstatechange (en-US)
연결의 ICE 신호 상태가 변경되면 signalingstatechange이벤트를 RTCPeerConnection에 전달합니다. 이는 또한, onsignalingstatechange (en-US) 이벤트 핸들러 속성을 통해 사용이 가능합니다.
statsended
모니터링이 되던 statistics 객체가 삭제되면, statsended이벤트를 전달합니다. RTCStatsEvent는 삭제된 객체의 마지막 리포트를 포함합니다. 마지막 리포트를 전달받고나서 여러개의 객체가 삭제되었다면, 여러 객체에 대한 마지막 리포트를 포함합니다. 예를 들어 연결이 종료되거나 삭제되면, statistics 객체는 삭제됩니다. 
The statsended event is sent when a statistics object being monitored is deleted. The RTCStatsEvent includes the final report on the deleted object (or objects, if multiple objects have been deleted since the last report was delivered). A statistics object is deleted, for example, when the connection is closed and deleted.
Available as the onstatsended event handler property.
track (en-US)
연결을 구성하고 있는 RTCRtpReceiver (en-US) 인스턴스들 중 하나에 신규 트랙이 추가된 후에, track이벤트를 보냅니다. 이는 또한, ontrack 이벤트 핸들러 속성을 통해 사용이 가능합니다.

사용되지 않는 이벤트

addstream (en-US) This is an obsolete API and is no longer guaranteed to work.
Sent when a new MediaStream (en-US) has been added to the connection. Instead of watching for this obsolete event, you should watch each for track (en-US) events; one is sent for each MediaStreamTrack added to the connection.
Available as the onaddstream (en-US) event handler property.
identityresult This is an obsolete API and is no longer guaranteed to work.
In old versions of the WebRTC specification, this event was used to indicate that an identity assertion is available. Now, you should instead wait for a the promise returned by peerIdentity (en-US) to resolve with an identity.
Also available using the onidentityresult event handler property.
idpassertionerror This is an obsolete API and is no longer guaranteed to work.
In old versions of the WebRTC specification, this event was used to indicate that an error occurred while attempting to generate an identity assertion. Now, you should instead wait for a the promise returned by peerIdentity (en-US) to be rejected with an error.
Also available as the onidpinsertionerror event handler property.
idpvalidationerror This is an obsolete API and is no longer guaranteed to work.
In old versions of the WebRTC specification, this event was used to indicate that an error occurred while attempting to validate an identity assertion. Now, you should instead wait for a the promise returned by peerIdentity (en-US) to be rejected with an error.
Also available using the onpeerdentity event handler property.
peeridentity This is an obsolete API and is no longer guaranteed to work.
In old versions of the WebRTC specification, this event was used to deliver a received identity. Now, you should instead wait for a the promise returned by peerIdentity (en-US) to resolve with an identity.
removestream (en-US) This is an obsolete API and is no longer guaranteed to work.
Sent to the RTCPeerConnection when a MediaStream (en-US) is removed from the connection. Instead of watching for this obsolete event, you should watch each stream for removetrack (en-US) events on each stream within the RTCPeerConnection.
Also available as the onaddstream (en-US) event handler property.

상수

RTCBundlePolicy 열거체

The RTCBundlePolicy enum defines string constants which are used to request a specific policy for gathering ICE candidates if the remote peer isn't compatible with the SDP BUNDLE standard for bundling multiple media streams on a single transport link.

In technical terms, a BUNDLE lets all media flow between two peers flow across a single 5-tuple; that is, from the same IP and port on one peer to the same IP and port on the other peer, using the same transport protocol.

상수명 설명
"balanced" On BUNDLE-aware connections, the ICE agent should gather candidates for all of the media types in use (audio, video, and data). Otherwise, the ICE agent should only negotiate one audio and video track on separate transports.
"max-compat" The ICE agent should gather candidates for each track, using separate transports to negotiate all media tracks for connections which aren't BUNDLE-compatible.
"max-bundle" The ICE agent should gather candidates for just one track. If the connection isn't BUNDLE-compatible, then the ICE agent should negotiate just one media track.

RTCIceConnectionState 열거체

The RTCIceConnectionState enum defines the string constants used to describe the current state of the ICE agent and its connection to the ICE server (that is, the STUN (en-US) or TURN (en-US) server).

상수명 설명
"new" The ICE agent is gathering addresses or is waiting to be given remote candidates through calls to RTCPeerConnection.addIceCandidate() (or both).
"checking" The ICE agent has been given one or more remote candidates and is checking pairs of local and remote candidates against one another to try to find a compatible match, but has not yet found a pair which will allow the peer connection to be made. It's possible that gathering of candidates is also still underway.
"connected" A usable pairing of local and remote candidates has been found for all components of the connection, and the connection has been established. It's possible that gathering is still underway, and it's also possible that the ICE agent is still checking candidates against one another looking for a better connection to use.
"completed" The ICE agent has finished gathering candidates, has checked all pairs against one another, and has found a connection for all components.
"failed" The ICE candidate has checked all candidates pairs against one another and has failed to find compatible matches for all components of the connection. It is, however, possible that the ICE agent did find compatible connections for some components.
"disconnected" Checks to ensure that components are still connected failed for at least one component of the RTCPeerConnection. This is a less stringent test than "failed" and may trigger intermittently and resolve just as spontaneously on less reliable networks, or during temporary disconnections. When the problem resolves, the connection may return to the "connected" state.
"closed" The ICE agent for this RTCPeerConnection has shut down and is no longer handling requests.

RTCIceGatheringState enum

RTCPeerConnection.iceGatheringState 속성을 사용하게되면 반환되는 RTCIceGatheringState enum은 현재의 ICE 수집 상태를 반영하여 알려주는 문자열 상수입니다. icegatheringstatechange 타입의 이벤트를 감시해서 이 값이 언제 변하는지 확인 할 수 있습니다.

상수명 설명
"new" 피어 연결이 새로 생성되었지만, 아직 네트워킹은 시작되지 않은 상태
"gathering" ICE 에이전트가 연결을 위한 ICE candidate를 수집하는 과정에 있음을 알려주는 상태
"complete" ICE 에이전트가 candidate 수집을 완료한 상태. 새로운 인터페이스가 추가되거나, 신규 ICE 서버가 추가와 같이 신규 ICE candidate를 수집해야하는 상황이 오면, 상태가 complete에서 gathering으로 다시 바뀝니다.

RTCIceTransportPolicy enum

The RTCIceTransportPolicy enum defines string constants which can be used to limit the transport policies of the ICE candidates to be considered during the connection process.

상수명 설명
"all" All ICE candidates will be considered.
"public" This is an obsolete API and is no longer guaranteed to work. Only ICE candidates with public IP addresses will be considered. Removed from the specification's May 13, 2016 working draft.
"relay" Only ICE candidates whose IP addresses are being relayed, such as those being passed through a TURN server, will be considered.

RTCPeerConnectionState enum

RTCPeerConnectionState enum은 RTCPeerConnection이 존재 할 수 도있는 상태에 대해 알려주는 문자열 상수를 정의합니다. 이 값들은 {domxref("RTCPeerConnection.connectionState", "connectionState")}} 속성에 의해 반홥됩니다. 근본적으로 이 상태는 연결에 의해 사용되는 모든 ICE 전송 (RTCIceTransport (en-US) 혹은 RTCDtlsTransport (en-US)의 타입)의 상태 집합을 나타냅니다. 

상수명 설명
"new"

연결의 ICE 전송 중 적어도 한 개가 새로 만들어진 "new" 상태이고,  그 외의 나머지는 다음의 상태 중 하나가 아니여야 합니다: "connecting", "checking", "failed", 혹은 "disconnected", 혹은  모든 연결의 전송이 끝났다는 "closed"상태.

"connecting" 하나 혹은 여러개의 ICE 전송이 현재 연결을 구성하는 중에 있음을 알려주는 값. 이는 RTCIceConnectionState"checking" 혹은 "connected"이며, 그 어떤 전송도 "failed"상태가 아니여야합니다. <<< Make this a link once I know where that will be documented
"connected" 연결에 의해 사용되는 모든 ICE 전송이 사용 중 ("connected" 혹은 "completed")이거나, 종료된 상태입니다. 추가적으로 최소 하나의 전송이 "connected" 혹은 "completed"입니다.
"disconnected" 연결에 대한 최소 한 개의 ICE 전송이 "disconnected"상태이고, 그 외의 다른 전송 상태는 "failed", "connecting", 혹은 "checking"이 아님을 알려주는 값. 
"failed"

연결에 대한 하나 혹은 여러개의 ICE 전송이 "failed"상태임을 알려주는 값.

"closed"

RTCPeerConnection 개통되지 않음을 알려주는 값.

2016년 5월 13일에 작성된 명세서의 초안에 따르면, 이 값은 RTCPeerConnectionState enum 안에 존재했었습니다. 따라서, signalingState (en-US)의 값을 통해 찾을 수 있습니다. 

RTCRtcpMuxPolicy enum

The RTCRtcpMuxPolicy enum defines string constants which specify what ICE candidates are gathered to support non-multiplexed RTCP. <<<add a link to info about multiplexed RTCP.

상수명 설명
"negotiate" Instructs the ICE agent to gather both RTP (en-US) and RTCP (en-US) candidates. If the remote peer can multiplex RTCP, then RTCP candidates are multiplexed atop the corresponding RTP candidates. Otherwise, both the RTP and RTCP candidates are returned, separately.
"require" Tells the ICE agent to gather ICE candidates for only RTP, and to multiplex RTCP atop them. If the remote peer doesn't support RTCP multiplexing, then session negotiation fails.

RTCSignalingState enum

The RTCSignalingState enum specifies the possible values of RTCPeerConnection.signalingState (en-US), which indicates where in the process of signaling the exchange of offer and answer the connection currently is.

상수명 설명
"stable" There is no ongoing exchange of offer and answer underway. This may mean that the RTCPeerConnection object is new, in which case both the localDescription and remoteDescription (en-US) are null; it may also mean that negotiation is complete and a connection has been established.
"have-local-offer" The local peer has called RTCPeerConnection.setLocalDescription(), passing in SDP representing an offer (usually created by calling RTCPeerConnection.createOffer() (en-US)), and the offer has been applied successfully.
"have-remote-offer" 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 RTCPeerConnection.setRemoteDescription() (en-US).
"have-local-pranswer" The offer sent by the remote peer has been applied and an answer has been created (usually by calling RTCPeerConnection.createAnswer()) and applied by calling RTCPeerConnection.setLocalDescription(). 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.
"have-remote-pranswer" A provisional answer has been received and successfully applied in response to an offer previously sent and established by calling setLocalDescription().
"closed" This is an obsolete API and is no longer guaranteed to work.

The connection is closed.

This value moved into the RTCPeerConnectionState enum in the May 13, 2016 draft of the specification, as it reflects the state of the RTCPeerConnection, not the signaling connection. You now detect a closed connection by checking for connectionState to be "closed" instead.

사양

사양명 상태 설명
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCPeerConnection' in that specification.
Candidate Recommendation 초기 정의.

브라우저 호환성

BCD tables only load in the browser

참고