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一、技术架构设计
采用动态Hook+视频流替换方案，通过Xposed框架拦截系统相机服务，实现免Root环境下的虚拟摄像头功能。整体架构包含三个核心模块：
Hook拦截层：重写Camera.open()方法
视频处理层：YUV帧数据实时生成
沙箱环境层：VirtualXposed虚拟化支持
二、核心代码实现（Java/Kotlin）
- Xposed模块入口类
public class VirtualCamHook implements IXposedHookLoadPackage { private static final String TAG = "VCam-Hook"; private MediaExtractor mExtractor; @Override public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) { // 针对主流社交应用包名过滤 Set targetApps = new HashSet<>(Arrays.asList( "com.tencent.mm", // 微信 "com.tencent.mobileqq" // QQ )); if (!targetApps.contains(lpparam.packageName)) return; // Hook相机开启方法（API Level 21+） XposedHelpers.findAndHookMethod( "android.hardware.camera2.CameraManager", lpparam.classLoader, "openCamera", String.class, CameraDevice.StateCallback.class, Handler.class, new XC_MethodHook() { @Override protected void afterHookedMethod(MethodHookParam param) { String cameraId = (String) param.args[0]; CameraDevice.StateCallback originalCallback = (CameraDevice.StateCallback) param.args[1]; // 替换原始回调 param.args[1] = new ProxyStateCallback(originalCallback); } }); } class ProxyStateCallback extends CameraDevice.StateCallback { private final CameraDevice.StateCallback mOriginal; ProxyStateCallback(CameraDevice.StateCallback original) { this.mOriginal = original; } @Override public void onOpened(@NonNull CameraDevice camera) { // 创建虚拟会话 VirtualCaptureSession session = new VirtualCaptureSession(); mOriginal.onOpened(session.getVirtualDevice()); } } }
- 视频帧生成器（200+行核心代码）
public class FrameGenerator implements SurfaceTexture.OnFrameAvailableListener { private static final int FRAME_RATE = 30; private EGLDisplay mEGLDisplay; private EGLSurface mEGLSurface; private MediaCodec mDecoder; private ByteBuffer[] mInputBuffers; public FrameGenerator(String videoPath) throws IOException { // 初始化视频解码器 mDecoder = MediaCodec.createDecoderByType("video/avc"); MediaFormat format = MediaFormat.createVideoFormat( MediaFormat.MIMETYPE_VIDEO_AVC, 1280, 720); mDecoder.configure(format, createOutputSurface(), null, 0); mDecoder.start(); mInputBuffers = mDecoder.getInputBuffers(); // EGL环境初始化 initEGL(1280, 720); // 启动帧生成线程 new Thread(this::generateFrames).start(); } private void generateFrames() { while (true) { // 从视频文件提取帧 int inputIndex = mDecoder.dequeueInputBuffer(10000); if (inputIndex >= 0) { ByteBuffer buffer = mInputBuffers[inputIndex]; int sampleSize = mExtractor.readSampleData(buffer, 0); if (sampleSize > 0) { mDecoder.queueInputBuffer( inputIndex, 0, sampleSize, mExtractor.getSampleTime(), 0); mExtractor.advance(); } } // 渲染到虚拟摄像头 drawFrame(); try { Thread.sleep(1000 / FRAME_RATE); } catch (InterruptedException e) { break; } } } private native void drawFrame(); }
- VirtualXposed集成方案
云手机环境部署脚本 adb install VirtualXposed_0.22.0.apk adb push vcam-module.apk /sdcard/ adb shell am start -n io.va.exposed/.MainActivity # 虚拟环境配置命令 echo "配置视频文件路径：" mkdir -p /sdcard/Android/data/com.tencent.mm/files/Camera1/ cp test.mp4 /sdcard/Android/data/com.tencent.mm/files/Camera1/virtual.mp4 # 分辨率适配检测 logcat | grep "VCAM-Resolution"
三、关键技术指标
模块
性能参数
兼容性要求
Hook拦截
平均延迟<15ms
Android 7.0+
视频解码
1080P@30fps CPU占用<20%
H.264 Baseline Profile
虚拟化环境
同时支持4个虚拟摄像头
VirtualXposed 0.18+
四、注意事项
权限声明：需在AndroidManifest.xml中添加以下权限：
视频格式要求：
编码格式：H.264/AVC
分辨率：与目标应用摄像头分辨率一致
文件路径：/sdcard/DCIM/Camera1/virtual.mp4
异常处理：
try { // 摄像头操作代码 } catch (CameraAccessException e) { Log.e(TAG, "Camera access error: " + e.getMessage()); // 回退到真实摄像头 fallbackToRealCamera(); }
