UVCCamera OpenGL 添加时间戳水印

Android使用OpenGL添加视频流水印的实现

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已于 2023-04-17 17:14:42 修改 · 1.1k 阅读

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CC 4.0 BY-SA版权

文章标签：

#android #音视频

于 2023-04-17 17:12:32 首次发布

该文介绍了如何在Android中通过OpenGL进行视频流渲染并添加水印的过程。首先，通过USB摄像头获取预览数据输出到外部纹理，然后利用FBO（帧缓冲对象）进行混合操作，结合相机纹理和水印纹理最终在SurfaceView上显示。文章详细阐述了创建外部纹理、初始化EGL上下文、绑定显示窗口缓冲区以及FBO渲染的过程，同时展示了动态绘制时间水印的方法。

视频流添加水印方式较多本文只从渲染角度修改

修改 CameraViewInterface 预览视图自定义 CameraSurfaceView 将相机预览数据输出到外部纹理通过fbo 混合水印纹理及Camera纹理最终输出到 SurfaceView 上

打开相机输出到外部纹理

mHandlerL.startPreview(mUVCCameraViewL.getSurfaceTexture());

private final OnDeviceConnectListener mOnDeviceConnectListener = new OnDeviceConnectListener() {
		@Override
		public void onAttach(final UsbDevice device) {
			if (DEBUG) Log.v(TAG, "onAttach:" + device);
			Toast.makeText(MainActivity.this, "USB_DEVICE_ATTACHED", Toast.LENGTH_SHORT).show();
		}

		@Override
		public void onConnect(final UsbDevice device, final UsbControlBlock ctrlBlock, final boolean createNew) {
			if (DEBUG) Log.v(TAG, "onConnect:" + device);
			if (!mHandlerL.isOpened()) {
				if (DEBUG) Log.v(TAG, "mHandlerL not opend:");
				mHandlerL.open(ctrlBlock);
				mHandlerL.startPreview(mUVCCameraViewL.getSurfaceTexture());
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						mCaptureButtonL.setVisibility(View.VISIBLE);
					}
				});
			} else if (!mHandlerR.isOpened()) {
				if (DEBUG) Log.v(TAG, "mHandlerR not opend:");
				mHandlerR.open(ctrlBlock);
				mHandlerR.startPreview(mUVCCameraViewR.getSurfaceTexture());
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						mCaptureButtonR.setVisibility(View.VISIBLE);
					}
				});
			}
		}

创建外部纹理及 SurfaceTexture

     cameraTexture = GlUtil.createRecordCameraTextureID();
        surfaceTexture = new SurfaceTexture(cameraTexture);

RenderThread 中绑定EGL上下文绑定显示窗口缓冲区

   private final void init() {
                if (DEBUG) Log.v(TAG, "RenderThread#init:");
                try {
                    glRenderManager.setCameraRotate(180);
                    glRenderManager = new GlRenderManager(appContext, mTexId, mDispSurface, mPreviewSurface);
                    glRenderManager.onInputSizeChanged(640, 480);
                    glRenderManager.onDisplaySizeChanged(mViewWidth, mViewHeight);


                    // notify to caller thread that previewSurface is ready
                } catch (GlUtil.OpenGlException e) {
                    e.printStackTrace();
                }
            }

 public GlRenderManager(Context context, int texture, Surface disPlaySurface, SurfaceTexture surfaceTexture) throws GlUtil.OpenGlException {
        this.context = context;
        this.texture = texture;
        this.surfaceTexture = surfaceTexture;
        mEglCore = new EglCore(null, EglCore.FLAG_TRY_GLES3);
        setDisPlaySurface(disPlaySurface);