Android屏幕共享-表面参数

时间:2020-05-15 05:59:57

标签: android screen agora.io

我正在尝试使用Agora.io在Android上实现屏幕共享。他们的样本很清楚:

MediaProjectionManager projectManager = (MediaProjectionManager) mContext.getSystemService(
Context.MEDIA_PROJECTION_SERVICE);

// Create the intent for screen capture. Call the startActivityForResult method to use the sharing function.
Intent intent = projectManager.createScreenCaptureIntent();
startActivityForResult(intent);

MediaProjection projection;
VirtualDisplay display;

// Override and implement the onActivityResult method of the Activity where you just called startActivityForResult.
@Override
onActivityResult(int requestCode, int resultCode, Intent resuleData) {
    projection = projectManager.getMediaProjection(resultCode, resultData);
    display = projection.createVirtualDisplay(name, width, height, dpi, flags, surface, callback, handler);
}

// The texture retrieved from the Surface will be sent by the SDK.
rtcEngine.pushExternalVideoFrame(new AgoraVideoFrame(...));

// Stop screen sharing.
projection.stop();

但是在 createVirtualDisplay 中,它们是一个表面参数。我不确定来自何处-或更多如何获得屏幕的表面?还是我实例化一个新的Surface实例?使用接受SurfaceTexture作为参数的构造函数。或者也许实现SurfaceTexture.OnFrameAvailableListener / OnImageAvailableListener(不确定)。

表面文档:

https://developer.android.com/reference/android/view/Surface

createVirtualDisplay文档:

https://developer.android.com/reference/android/media/projection/MediaProjection#createVirtualDisplay(java.lang.String,%20int,%20int,%20int,%20int,%20android.view.Surface,%20android.hardware.display.VirtualDisplay.Callback,%20android.os.Handler)

1 个答案:

答案 0 :(得分:1)

有几种方法可以获取Surface:

  1. 如果您要进行视频编码,请使用MediaCodec.createInputSurface()作为编码模块的输入;
  2. 如果要接收YUV帧,请使用ImageReader.getSurface()创建表面;
  3. 如果您想自己进行OpenGL渲染,则可以在OpenGL上下文下创建纹理,并使用该纹理创建SurfaceTexture,从而创建自己的Surface。

但是请注意,请勿使用已附加到视图层次结构的Surface。