Use libVLC to get a pixel array

[ana]

I can't figure out how to make libVLC read a video file and output the current frame to a pixel array. I found an example using SDL and another using SFML, but I don't understand how to make use of them.

I want to extract a frame and copy the data to an array in the form of

Code: Select all

int pixelarray[imagewidth*imageheight*4]

where pixelarray[i*j*4] would be the red int, pixelarray[i*j*4+1] would be green, pixelarray[i*j*4+2] would be blue and pixelarray[i*j*4+3] would be the alpha.

I would like to avoid all non-libvlc code except standard C++98. I guess if it is absolutely required, boost would be ok too.

Where and how can I get this data? And when can I copy it to a local array safely?

[Jean-Baptiste Kempf]

Use the callbacks.

[ana]

Use the callbacks.

I realise this. I mean, Where and how can I get this data? And when can I copy it to a local array safely?

I want to know how to remove the non-libvlc specific parts of these examples: https://wiki.videolan.org/LibVLC_SampleCode_SDL/ and http://en.sfml-dev.org/forums/index.php?topic=9386.0 , so that the frame can just be put into a block of memory. I tired to do it and, a hex dump confirmed what I had thought was the pixel array wasn't being updated. So I am hoping someone who knows more about libvlc than I might know how to interface with libvlc and be able to explain it.

[RSATom]

https://code.google.com/p/fbvlc/source/ ... vlc_vmem.h
https://code.google.com/p/fbvlc/source/ ... c_vmem.cpp