Created attachment 137090 [details] [review]
Adds example to show the memory leak

This patch adds an example program to the samples.

The program sends buffers to an appsrc. Besides a good showcase of how to use buffer/appsrc, it also shows the memory leakage.

Fortunately, it turned out the memory leak wasn't in gstreamer-sharp.

It is in Mono.Cairo or the sample app, however you want to see it. The Cairo.Surface needs to be explicitly destroyed.

On top of the previouse patch, apply:
-               return img.Data;
+               byte[] data = img.Data;
+               img.Destroy();
+               return data;

The testcase now runs smoothly, without eating up all your GBs of ram.

Please do add the corrected sample to the git tree, as it is a nice sample app.