kotlion 实现android WebRTC本地流Demo

由于手机端浏览器播放云游戏流效果不太理想，所以考虑开发专有手机端，目前两个想法，第一用私有协议实现视频传输推流，第二基于android WebRTC。第二由我来负责，特此把开发学习过程中写的小demo记录下。
参考链接：https://www.jianshu.com/p/eb5fd116e6c8
原文链接：https://blog.csdn.net/weixin_44259356/article/details/101449173

核心代码

基本思路和参考链接想法一样，只是语言换成了kotlion，有部分的函数调用略有区别，使用摄像头采集流显示在首栏，然后推流到第二栏，核心代码如下：

xml代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/FID"
    tools:context=".MainActivity">

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" android:id="@+id/TEXT_ID"/>


<org.webrtc.SurfaceViewRenderer
        android:id="@+id/localView"
        android:layout_width="match_parent"
        android:layout_height="100pt"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

<org.webrtc.SurfaceViewRenderer
        android:id="@+id/remoteView"
        android:layout_width="match_parent"
        android:layout_height="100pt"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>

Activity代码

        val eglBaseContext = EglBase.create().eglBaseContext

        // create PeerConnectionFactory
        PeerConnectionFactory.initialize(
            PeerConnectionFactory.InitializationOptions
                .builder(this)
                .createInitializationOptions()
        )
        val options = PeerConnectionFactory.Options()
        val defaultVideoEncoderFactory = DefaultVideoEncoderFactory(eglBaseContext, true, true)
        val defaultVideoDecoderFactory = DefaultVideoDecoderFactory(eglBaseContext)
        peerConnectionFactory = PeerConnectionFactory.builder()
            .setOptions(options)
            .setVideoEncoderFactory(defaultVideoEncoderFactory)
            .setVideoDecoderFactory(defaultVideoDecoderFactory)
            .createPeerConnectionFactory()

        val surfaceTextureHelper = SurfaceTextureHelper.create("CaptureThread", eglBaseContext)
        // create VideoCapturer
        val videoCapturer = createCameraCapturer(true)
        val videoSource = peerConnectionFactory.createVideoSource(videoCapturer!!.isScreencast)
        videoCapturer.initialize(
            surfaceTextureHelper,
            applicationContext,
            videoSource.capturerObserver
        )
        videoCapturer.startCapture(480, 640, 30)

        localView.setMirror(true)
        localView.init(eglBaseContext, null)

        // create VideoTrack
        val videoTrack = peerConnectionFactory.createVideoTrack("100", videoSource)
//        // display in localView
             videoTrack.addSink(localView);


        val remoteSurfaceTextureHelper =
            SurfaceTextureHelper.create("RemoteCaptureThread", eglBaseContext)
        // create VideoCapturer
        val remoteVideoCapturer = createCameraCapturer(false)
        val remoteVideoSource =
            peerConnectionFactory.createVideoSource(remoteVideoCapturer!!.isScreencast)
        remoteVideoCapturer.initialize(
            remoteSurfaceTextureHelper,
            applicationContext, remoteVideoSource.capturerObserver
        )
        remoteVideoCapturer.startCapture(480, 640, 30)

        remoteView.setMirror(false)
        remoteView.init(eglBaseContext, null)

        // create VideoTrack
        val remoteVideoTrack = peerConnectionFactory.createVideoTrack("102", remoteVideoSource)
//        // display in remoteView
       //       remoteVideoTrack.addSink(remoteView);


        mediaStreamLocal = peerConnectionFactory.createLocalMediaStream("mediaStreamLocal")
        mediaStreamLocal.addTrack(videoTrack)

        mediaStreamRemote = peerConnectionFactory.createLocalMediaStream("mediaStreamRemote")
        mediaStreamRemote.addTrack(remoteVideoTrack)

        call(mediaStreamLocal, mediaStreamRemote)


    }

    private fun call(localMediaStream: MediaStream, remoteMediaStream: MediaStream) {
        val iceServers = ArrayList<PeerConnection.IceServer>()
        peerConnectionLocal= peerConnectionFactory.createPeerConnection(
            iceServers,
            object : PeerConnectionAdapter("localconnection") {
                override fun onIceCandidate(iceCandidate: IceCandidate) {
                    super.onIceCandidate(iceCandidate)
                    peerConnectionRemote.addIceCandidate(iceCandidate)
                }

                override fun onAddStream(mediaStream: MediaStream) {
                    super.onAddStream(mediaStream)
                    val remoteVideoTrack = mediaStream.videoTracks[0]
                    runOnUiThread {
                       // remoteVideoTrack.addSink(localView)
                    }
                }
            })!!

        peerConnectionRemote = peerConnectionFactory.createPeerConnection(
            iceServers,
            object : PeerConnectionAdapter("remoteconnection") {
                override fun onIceCandidate(iceCandidate: IceCandidate) {
                    super.onIceCandidate(iceCandidate)
                    peerConnectionLocal.addIceCandidate(iceCandidate)
                }

                override fun onAddStream(mediaStream: MediaStream) {
                    super.onAddStream(mediaStream)
                    val localVideoTrack = mediaStream.videoTracks[0]
                    runOnUiThread {
                        localVideoTrack.addSink(remoteView)
                    }
                }
            })!!

        peerConnectionLocal.addStream(localMediaStream)
        peerConnectionLocal.createOffer(object : SdpAdapter("local offer sdp") {
            override fun onCreateSuccess(sessionDescription: SessionDescription) {
                super.onCreateSuccess(sessionDescription)
                // todo crashed here
                peerConnectionLocal.setLocalDescription(
                    SdpAdapter("local set local"),
                    sessionDescription
                )
                peerConnectionRemote.addStream(remoteMediaStream)
                peerConnectionRemote.setRemoteDescription(
                    SdpAdapter("remote set remote"),
                    sessionDescription
                )
                peerConnectionRemote.createAnswer(object : SdpAdapter("remote answer sdp") {
                    override fun onCreateSuccess(sdp: SessionDescription) {
                        super.onCreateSuccess(sdp)
                        peerConnectionRemote.setLocalDescription(
                            SdpAdapter("remote set local"),
                            sdp
                        )
                        peerConnectionLocal.setRemoteDescription(
                            SdpAdapter("local set remote"),
                            sdp
                        )
                    }
                }, MediaConstraints())
            }
        }, MediaConstraints())
    }

class PeerConnectionAdapter

package com.example.myapplication

import android.util.Log
import org.webrtc.*

open class PeerConnectionAdapter(tag: String) : PeerConnection.Observer {

    private val tag: String = "chao $tag"

    private fun log(s: String) {
        Log.d(tag, s)
    }

    override fun onSignalingChange(signalingState: PeerConnection.SignalingState) {
        log("onSignalingChange $signalingState")
    }

    override fun onIceConnectionChange(iceConnectionState: PeerConnection.IceConnectionState) {
        log("onIceConnectionChange $iceConnectionState")
    }

    override fun onIceConnectionReceivingChange(b: Boolean) {
        log("onIceConnectionReceivingChange $b")
    }

    override fun onIceGatheringChange(iceGatheringState: PeerConnection.IceGatheringState) {
        log("onIceGatheringChange $iceGatheringState")
    }

    override fun onIceCandidate(iceCandidate: IceCandidate) {
        log("onIceCandidate $iceCandidate")
    }

    override fun onIceCandidatesRemoved(iceCandidates: Array<IceCandidate>) {
        log("onIceCandidatesRemoved $iceCandidates")
    }

    override fun onAddStream(mediaStream: MediaStream) {
        log("onAddStream $mediaStream")
    }

    override fun onRemoveStream(mediaStream: MediaStream) {
        log("onRemoveStream $mediaStream")
    }

    override fun onDataChannel(dataChannel: DataChannel) {
        log("onDataChannel $dataChannel")
    }

    override fun onRenegotiationNeeded() {
        log("onRenegotiationNeeded ")
    }

    override fun onAddTrack(rtpReceiver: RtpReceiver, mediaStreams: Array<MediaStream>) {
        log("onAddTrack $mediaStreams")
    }
}

class SdpAdapter

package com.example.myapplication

import android.util.Log
import org.webrtc.SdpObserver
import org.webrtc.SessionDescription

open class SdpAdapter(tag: String) : SdpObserver {


    private val tag: String = "chao $tag"

    private fun log(s: String) {
        Log.d(tag, s)
    }

    override fun onCreateSuccess(sessionDescription: SessionDescription) {
        log("onCreateSuccess $sessionDescription")
    }

    override fun onSetSuccess() {
        log("onSetSuccess ")
    }

    override fun onCreateFailure(s: String) {
        log("onCreateFailure $s")
    }

    override fun onSetFailure(s: String) {
        log("onSetFailure $s")
    }
}