CODEWITHSUNDEEP
androidsurfaceviewandroid-mediarecorder
Mark Herscher
Mark Herscher

Reputation: 1810

Need to draw to surface used by MediaRecorder

I need to record a video that just contains one single frame: an image specified by the user (it can be of any length, but it will only have the same static image). So, I figured I could use the new MediaRecorder.VideoSource.SURFACE and just draw to the Surface being used by the recorder. I initialize the recorder properly, and I can even call MediaRecorder.getSurface() without an exception (something that is apparently tricky).

My problem is somewhat embarrassing: I don't know what to do with the surface returned. I need to draw to it somehow, but all examples I can find involve drawing to a SurfaceView. Is this surface the same surface used by MediaRecorder.setPreviewDisplay()? How do I draw something to it?

Upvotes: 3

Views: 1432

Answers (1)

fadden
fadden

Reputation: 52303

In theory you can use Surface#lockCanvas() to get a Canvas to draw on if you want to render in software. There used to be problems with this on some platforms; not sure if that has been fixed.

The other option is to create an EGLSurface from the Surface and render onto it with OpenGL ES. You can find examples of this, with some code to manage all of the EGL setup, in Grafika.

The GLES recording examples uses MediaCodec rather than MediaRecorder, but the idea is the same, and it should be much simpler with MediaRecorder.

Upvotes: 2

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