记录用的，我也记不得了，别看，这文章

package com.example.xiaobaiyu;import android.os.Bundle;import androidx.appcompat.app.AppCompatActivity;import org.webrtc.AudioSource;
import org.webrtc.AudioTrack;
import org.webrtc.Camera1Enumerator;
import org.webrtc.EglBase;
import org.webrtc.MediaConstraints;
import org.webrtc.MediaStream;
import org.webrtc.PeerConnection;
import org.webrtc.PeerConnectionFactory;
import org.webrtc.SurfaceTextureHelper;
import org.webrtc.SurfaceViewRenderer;
import org.webrtc.VideoCapturer;
import org.webrtc.VideoSource;
import org.webrtc.VideoTrack;public class MainActivity extends AppCompatActivity {PeerConnectionFactory peerConnectionFactory;PeerConnection peerConnectionLocal;PeerConnection peerConnectionRemote;SurfaceViewRenderer localView;SurfaceViewRenderer remoteView;MediaStream mediaStreamLocal;MediaStream mediaStreamRemote;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// create PeerConnectionFactoryPeerConnectionFactory.InitializationOptions initializationOptions = PeerConnectionFactory.InitializationOptions.builder(this).createInitializationOptions();PeerConnectionFactory.initialize(initializationOptions);PeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder().createPeerConnectionFactory();
//      有了这个对象，就有了声音合视频对象peerConnetctionFactory// create AudioSource  音频源//audioSource 开始合暂停声音AudioSource audioSource = peerConnectionFactory.createAudioSource(new MediaConstraints());//MediaConstraionts 把视频和声音合起来//一个包，把audioSource 装到AudioStream里AudioTrack audioTrack = peerConnectionFactory.createAudioTrack("101", audioSource);//EglBase提供EGL渲染EglBase.Context eglBaseContext = EglBase.create().getEglBaseContext();//使用SurfaceTextureHelper初始化VideoCapturer 否者调用预览异常SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("CaptureThread", eglBaseContext);// create VideoCapturer提供摄像头数据 控制分辨率和帧率VideoCapturer videoCapturer = createCameraCapturer();VideoSource videoSource = peerConnectionFactory.createVideoSource(videoCapturer.isScreencast());videoCapturer.initialize(surfaceTextureHelper, getApplicationContext(), videoSource.getCapturerObserver());videoCapturer.startCapture(480, 640, 30);//渲染SurfaceViewRenderer localView = findViewById(R.id.localView);localView.setMirror(true);localView.init(eglBaseContext, null);// create VideoTrack视频轨道   作用将VideoCapturer获取到的视频数据结合VideoSource输出到SurfaceViewRenderer渲染显示。VideoTrack videoTrack = peerConnectionFactory.createVideoTrack("101", videoSource);// display in localViewvideoTrack.addSink(localView);}private VideoCapturer createCameraCapturer() {// CameraEnumerator接口兼容Camera1和Camera2Camera1Enumerator enumerator = new Camera1Enumerator(false);final String[] deviceNames = enumerator.getDeviceNames();// First, try to find front facing camerafor (String deviceName : deviceNames) {if (enumerator.isFrontFacing(deviceName)) {VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);if (videoCapturer != null) {return videoCapturer;}}}// Front facing camera not found, try something elsefor (String deviceName : deviceNames) {if (!enumerator.isFrontFacing(deviceName)) {VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);if (videoCapturer != null) {return videoCapturer;}}}return null;}}