获取从SurfaceView框架 [英] Getting a frame from SurfaceView

问题描述

现在我遇到的困难是采取SurfaceView的屏幕截图。任何人都可以请帮助？

The difficulty I am having now is to take a screenshot of the SurfaceView. Could anyone please help?

我的团队正在做一​​个Android项目中，我们使用媒体codeC脱$ C C视频输入$，并呈现进到表面。 活动工具

My team is doing an Android project where we use MediaCodec to decode the video feed and render the feed onto a Surface. The activity implements

SurfaceHolder.Callback

然后，我们创建了一个SurfaceView，并添加回调：

Then we created a SurfaceView and add the Callback:

mySurfaveView.getHolder().addCallback(this);

然后，我们开始c。在视频输入（我们有确实的去code的方法）

Then we start decode the video feed in (we have a method that does the decode)

surfaceChanged(SurfaceHolder holder, int format, int width, int height)

视频做工精细，现在我想盘点一下被渲染到SurfaceView截图。我尝试了好几种方法可以做到这一点，但我没有成功。以下是我曾尝试：

The video work fine, now I want to take screenshot of what gets rendered onto the SurfaceView. I have tried several ways to do this, but I didn't succeed. Following are what I have tried:

1. 我已经厌倦了越来越rootView的drawingcache。
2. 在尝试直接从媒体codeC获得帧。
3. 试过draw（）方法绘制在画布上。

截至目前，我特林创建一个自定义的SurfaceView和覆盖的OnDraw方法那里。不过，我从来没有创建一个自定义的SurfaceView。我是在正确的方向？

As of now I am tring to create a custom SurfaceView and override the onDraw method there. However, I have never created a custom SurfaceView. Am I on the right direction?

请帮助。谢谢！

推荐答案

您无法捕捉一个SurfaceView，如本<一个解释href="http://stackoverflow.com/questions/27817577/android-take-screenshot-of-surface-view-shows-black-screen">other问题。

You can't capture a SurfaceView, as explained in this other question.

SurfaceViews很少会想覆盖的OnDraw（）。一般情况下SurfaceView的视图部分是透明的洞。

SurfaceViews will rarely want to override onDraw(). Generally the View part of the SurfaceView is a transparent hole.

有关媒体codeC输出的特殊情况下，你有两个选择。您可以直接输出到 的表面纹理，然后渲染视频帧使用OpenGL ES的两倍。一旦到了SurfaceView显示，一旦到一个离屏缓冲，从中可以捕捉到像素。

For the specific case of MediaCodec output, you have a couple of choices. You can direct the output to a SurfaceTexture, and then render the video frame twice using OpenGL ES. Once to the SurfaceView for display, once to an off-screen buffer from which you can capture the pixels.

另一种方法是用一个 TextureView 的取代SurfaceView，和然后使用 getBitmap（）通话抢到视频帧。

Another approach is to replace the SurfaceView with a TextureView, and then use the getBitmap() call to grab video frames.

各种实例中可以找到 Grafika 。

这篇关于获取从SurfaceView框架的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！