Android WebRTC 一 使用相机

一 首先在android studio 里面新建一个empty 项目
这儿要用到摄像头和录音,因此要申请权限

image.png

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />

然后加入WebRTC 的依赖,还有权限申请的依赖

image.png

  implementation 'org.webrtc:google-webrtc:1.0.32006'
  implementation 'pub.devrel:easypermissions:3.0.0'

在这个地方把阿里云的镜像写上,否则是弄不下来google 的依赖包的

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//        google()
//        mavenCentral()
        maven { url 'https://maven.aliyun.com/repository/public' }   // new
        maven { url 'https://maven.aliyun.com/repository/google' }    // new
        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }   // new

这时候就 sync 一下项目后, 加上webrtc的显示组件

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

然后在MainActivity里面写如下的代码:

package com.example.myappwebrtc01;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.os.Bundle;

import org.webrtc.AudioSource;
import org.webrtc.AudioTrack;
import org.webrtc.Camera1Enumerator;
import org.webrtc.EglBase;
import org.webrtc.MediaConstraints;
import org.webrtc.PeerConnectionFactory;
import org.webrtc.SurfaceTextureHelper;
import org.webrtc.SurfaceViewRenderer;
import org.webrtc.VideoCapturer;
import org.webrtc.VideoSource;
import org.webrtc.VideoTrack;

import pub.devrel.easypermissions.EasyPermissions;

public class MainActivity extends AppCompatActivity {
    String[] perms = {Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (!EasyPermissions.hasPermissions(MainActivity.this, perms)) {
            EasyPermissions.requestPermissions(
                MainActivity.this,
                "需要相机和录音权限",
                100,
                perms
            );
        }

        // create PeerConnectionFactory
        PeerConnectionFactory.initialize(PeerConnectionFactory.InitializationOptions.builder(this).createInitializationOptions());
        PeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder().createPeerConnectionFactory();

        // create AudioSource
        AudioSource audioSource = peerConnectionFactory.createAudioSource(new MediaConstraints());
        AudioTrack audioTrack = peerConnectionFactory.createAudioTrack("101", audioSource);

        EglBase.Context eglBaseContext = EglBase.create().getEglBaseContext();

        SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("CaptureThread", eglBaseContext);

        // create VideoCapturer
        VideoCapturer videoCapturer = this.createCameraCapturer();
        VideoSource videoSource = peerConnectionFactory.createVideoSource(videoCapturer.isScreencast());
        videoCapturer.initialize(surfaceTextureHelper, getApplicationContext(), videoSource.getCapturerObserver());
        videoCapturer.startCapture(480, 640, 30);

        SurfaceViewRenderer localView = findViewById(R.id.localView);
        localView.setMirror(true);
        localView.init(eglBaseContext, null);

        // create VideoTrack
        VideoTrack videoTrack = peerConnectionFactory.createVideoTrack("101", videoSource);
        // display in localView
        videoTrack.addSink(localView);
    }

    private VideoCapturer createCameraCapturer() {
        Camera1Enumerator enumerator = new Camera1Enumerator(false);
        final String[] deviceNames = enumerator.getDeviceNames();

        // First, try to find front facing camera
        for (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 else
        for (String deviceName : deviceNames) {
            if (!enumerator.isFrontFacing(deviceName)) {
                VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);

                if (videoCapturer != null) {
                    return videoCapturer;
                }
            }
        }

        return null;
    }

}

最后编译运行.