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/*
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.webrtc;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Java wrapper for a C++ RtpTransceiverInterface.
*
* The RTCRtpTransceiver maps to the RTCRtpTransceiver defined by the WebRTC
* specification. A transceiver represents a combination of an RTCRtpSender
* and an RTCRtpReceiver that share a common mid. As defined in JSEP, an
* RTCRtpTransceiver is said to be associated with a media description if its
* mid property is non-nil; otherwise, it is said to be disassociated.
* JSEP: https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-24
*
*
Note that RTCRtpTransceivers are only supported when using
* RTCPeerConnection with Unified Plan SDP.
*
*
WebRTC specification for RTCRtpTransceiver, the JavaScript analog:
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver
*/
public class RtpTransceiver {
/** Java version of webrtc::RtpTransceiverDirection - the ordering must be kept in sync. */
public enum RtpTransceiverDirection {
SEND_RECV(0),
SEND_ONLY(1),
RECV_ONLY(2),
INACTIVE(3);
private final int nativeIndex;
private RtpTransceiverDirection(int nativeIndex) {
this.nativeIndex = nativeIndex;
}
@CalledByNative("RtpTransceiverDirection")
int getNativeIndex() {
return nativeIndex;
}
@CalledByNative("RtpTransceiverDirection")
static RtpTransceiverDirection fromNativeIndex(int nativeIndex) {
for (RtpTransceiverDirection type : RtpTransceiverDirection.values()) {
if (type.getNativeIndex() == nativeIndex) {
return type;
}
}
throw new IllegalArgumentException(
"Uknown native RtpTransceiverDirection type" + nativeIndex);
}
}
/**
* Tracks webrtc::RtpTransceiverInit. https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiverinit
* A structure for initializing an RtpTransceiver in a call to addTransceiver.
* Note: This does not contain a list of encoding parameters, because they are currently
* not being used natively.
*/
public static final class RtpTransceiverInit {
private final RtpTransceiverDirection direction;
private final List streamIds;
private final List sendEncodings;
public RtpTransceiverInit() {
this(RtpTransceiverDirection.SEND_RECV);
}
public RtpTransceiverInit(RtpTransceiverDirection direction) {
this(direction, Collections.emptyList(), Collections.emptyList());
}
public RtpTransceiverInit(RtpTransceiverDirection direction, List streamIds) {
this(direction, streamIds, Collections.emptyList());
}
public RtpTransceiverInit(RtpTransceiverDirection direction, List streamIds,
List sendEncodings) {
this.direction = direction;
this.streamIds = new ArrayList(streamIds);
this.sendEncodings = new ArrayList(sendEncodings);
}
@CalledByNative("RtpTransceiverInit")
int getDirectionNativeIndex() {
return direction.getNativeIndex();
}
@CalledByNative("RtpTransceiverInit")
List getStreamIds() {
return new ArrayList(this.streamIds);
}
@CalledByNative("RtpTransceiverInit")
List getSendEncodings() {
return new ArrayList(this.sendEncodings);
}
}
private long nativeRtpTransceiver;
private RtpSender cachedSender;
private RtpReceiver cachedReceiver;
@CalledByNative
protected RtpTransceiver(long nativeRtpTransceiver) {
this.nativeRtpTransceiver = nativeRtpTransceiver;
cachedSender = nativeGetSender(nativeRtpTransceiver);
cachedReceiver = nativeGetReceiver(nativeRtpTransceiver);
}
/**
* Media type of the transceiver. Any sender(s)/receiver(s) will have this
* type as well.
*/
public MediaStreamTrack.MediaType getMediaType() {
checkRtpTransceiverExists();
return nativeGetMediaType(nativeRtpTransceiver);
}
/**
* The mid attribute is the mid negotiated and present in the local and
* remote descriptions. Before negotiation is complete, the mid value may be
* null. After rollbacks, the value may change from a non-null value to null.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-mid
*/
public String getMid() {
checkRtpTransceiverExists();
return nativeGetMid(nativeRtpTransceiver);
}
/**
* The sender attribute exposes the RtpSender corresponding to the RTP media
* that may be sent with the transceiver's mid. The sender is always present,
* regardless of the direction of media.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-sender
*/
public RtpSender getSender() {
return cachedSender;
}
/**
* The receiver attribute exposes the RtpReceiver corresponding to the RTP
* media that may be received with the transceiver's mid. The receiver is
* always present, regardless of the direction of media.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-receiver
*/
public RtpReceiver getReceiver() {
return cachedReceiver;
}
/**
* The stopped attribute indicates that the sender of this transceiver will no
* longer send, and that the receiver will no longer receive. It is true if
* either stop has been called or if setting the local or remote description
* has caused the RtpTransceiver to be stopped.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stopped
*/
public boolean isStopped() {
checkRtpTransceiverExists();
return nativeStopped(nativeRtpTransceiver);
}
/**
* The direction attribute indicates the preferred direction of this
* transceiver, which will be used in calls to CreateOffer and CreateAnswer.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-direction
*/
public RtpTransceiverDirection getDirection() {
checkRtpTransceiverExists();
return nativeDirection(nativeRtpTransceiver);
}
/**
* The current_direction attribute indicates the current direction negotiated
* for this transceiver. If this transceiver has never been represented in an
* offer/answer exchange, or if the transceiver is stopped, the value is null.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-currentdirection
*/
public RtpTransceiverDirection getCurrentDirection() {
checkRtpTransceiverExists();
return nativeCurrentDirection(nativeRtpTransceiver);
}
/**
* Sets the preferred direction of this transceiver. An update of
* directionality does not take effect immediately. Instead, future calls to
* CreateOffer and CreateAnswer mark the corresponding media descriptions as
* sendrecv, sendonly, recvonly, or inactive.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-direction
*/
public void setDirection(RtpTransceiverDirection rtpTransceiverDirection) {
checkRtpTransceiverExists();
nativeSetDirection(nativeRtpTransceiver, rtpTransceiverDirection);
}
/**
* The Stop method irreversibly stops the RtpTransceiver. The sender of this
* transceiver will no longer send, the receiver will no longer receive.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stop
*/
public void stop() {
checkRtpTransceiverExists();
nativeStop(nativeRtpTransceiver);
}
@CalledByNative
public void dispose() {
checkRtpTransceiverExists();
cachedSender.dispose();
cachedReceiver.dispose();
JniCommon.nativeReleaseRef(nativeRtpTransceiver);
nativeRtpTransceiver = 0;
}
private void checkRtpTransceiverExists() {
if (nativeRtpTransceiver == 0) {
throw new IllegalStateException("RtpTransceiver has been disposed.");
}
}
private static native MediaStreamTrack.MediaType nativeGetMediaType(long rtpTransceiver);
private static native String nativeGetMid(long rtpTransceiver);
private static native RtpSender nativeGetSender(long rtpTransceiver);
private static native RtpReceiver nativeGetReceiver(long rtpTransceiver);
private static native boolean nativeStopped(long rtpTransceiver);
private static native RtpTransceiverDirection nativeDirection(long rtpTransceiver);
private static native RtpTransceiverDirection nativeCurrentDirection(long rtpTransceiver);
private static native void nativeStop(long rtpTransceiver);
private static native void nativeSetDirection(
long rtpTransceiver, RtpTransceiverDirection rtpTransceiverDirection);
}