Android-WebRTC-实现摄像头显示

EglBase是什么？

它提供了一个接口，用于在Android平台上创建和管理EGL（嵌入式系统图形库）上下文，以便在WebRTC中进行图像和视频的处理和渲染。

Capturer, Source, Track, Sink分别是什么？

Capturer（采集器）是指用于采集音频或视频数据的设备或软件。它可以是麦克风、摄像头或其他采集设备。
Source（源）是指从采集器获取的原始音频或视频数据。它是数据的起点，并可能包含噪音、干扰或其他不必要的信息。
Track（跟踪器）是指对源数据进行处理和分析的组件。它可以包括音频或视频的编码、滤波、分割、特征提取等算法和技术。
Sink（接收器）是指从跟踪器输出的经过处理的音频或视频数据的目标或目的地。它可以是扬声器、显示器或其他接收设备。

activity_rtc.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:padding="@dimen/dp_20"><org.webrtc.SurfaceViewRendererandroid:id="@+id/localView"android:layout_width="match_parent"android:layout_height="0dp"app:layout_constraintHeight_percent="0.5"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toTopOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>

RtcActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;import androidx.annotation.Nullable;import org.webrtc.Camera1Enumerator;
import org.webrtc.EglBase;
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 RtcActivity extends Activity {private static final String TAG = "RtcRemoteActivity";@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_rtc);//  factory static initPeerConnectionFactory.initialize(PeerConnectionFactory.InitializationOptions.builder(this).createInitializationOptions());PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();//  factory createPeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder().setOptions(options).createPeerConnectionFactory();// create videoCapturerCamera1Enumerator camera1Enumerator = new Camera1Enumerator(false);// false输出到surfaceString[] deviceNames = camera1Enumerator.getDeviceNames();VideoCapturer videoCapturer = null;for (String deviceName : deviceNames) {if (camera1Enumerator.isFrontFacing(deviceName)) {VideoCapturer capturer = camera1Enumerator.createCapturer(deviceName, null);if (capturer != null) {videoCapturer = capturer;break;}Log.e(TAG, "onCreate: create capturer fail");return;}}if (videoCapturer == null) {return;}//  create videoSourceVideoSource videoSource = peerConnectionFactory.createVideoSource(videoCapturer.isScreencast());//  init videoCapturerEglBase.Context eglBaseContext = EglBase.create().getEglBaseContext();SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("surfaceTexture", eglBaseContext);videoCapturer.initialize(surfaceTextureHelper, this, videoSource.getCapturerObserver());videoCapturer.startCapture(480, 640, 30);// width, height, frame//  create videoTrackVideoTrack videoTrack = peerConnectionFactory.createVideoTrack("videoTrack-1", videoSource);//  get show viewSurfaceViewRenderer localView = findViewById(R.id.localView);localView.setMirror(true);// 镜像localView.init(eglBaseContext, null);//  link track to view so that data show in viewvideoTrack.addSink(localView);}
}