[vlc-devel] full screen overlay for automatic projection mapping

[Rémi Denis-Courmont]

Hi,

SPU source plugins can render an overlay, but so far it cannot stretch into the black bars.

Le 4 octobre 2019 02:38:29 GMT+03:00, Andras Szalai <slymsg at gmail.com> a écrit :
>I am trying to develop a filter plugin to fix some projection issues
>for my
>home cinema setup. I got as far as writing and compiling a simple
>out-of-tree video filter plugin that modifies the video by moving some
>pixels around.
>
>Eventually I want to be able to do an automatic calibration. The filter
>would work in tandem
>with a companion smartphone app. The filter plugin would render some
>specific patterns on the full screen output, the smartphone app would
>analyze the patterns and communicate back to the plugin somehow. This
>would
>be great for correcting for wobbly projection screens.
>
>The problem I am having is that filter plugins work on the video, not
>on
>the output, so I don't have a way to render to the "black areas".
>
>I want to avoid writing an output plugin as that would be a lot more
>work
>and would be platform dependent.
>
>My video filter plugin can potentially resize the video to match the
>size
>of the output, but this would be inefficient and everything downstream
>of
>the plugin would be working on a larger resolution video.
>
>I am new to VLC internals. Is there a way to render an overlay (e.g. a
>checkerboard pattern) from a filter plugin such that it potentially
>covers
>the entire full screen output?
>
>Sly

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