Overlay Matrix: write more than one pixel at a time ?

[zaicik]

Looking to make "generative" scripts, I want to feed "live" data to FPP (e.g. sensor-based)

While the API will gladly give an overlay model's full contents (e.g. /api/overlays/model/:ModelName/data)  I haven't found how to feed it data other than one pixel at a time (/api/overlays/model/:ModelName/data)

While this API is practical to draw one pixel at a time from the matrix tool menu, I'm guessing there might be a more efficient route if I want to take more control... 

Any tips / suggestions ? 🙏

[darylc]

There is no API command to achieve that today.  We would welcome a pull request for an implementation of one.

You could draw inspiration from the CopyFileToMappedBlock function in https://github.com/FalconChristmas/fpp/blob/master/src/fppmm.cpp

[dkulp]

If the scripts are running on the same FPP instance as the models, the best bet is to mmap the data blocks from /dev/shm .   Each of the models gets a file in there of the data and you should be able to write into it directly.  

[zaicik]

Thanks for the pointers.
I'm gonna start by fiddling with /dev/shm as per @dkulp 's recommendation, and see where it takes me.

The data blocks being accessible this way looks like an amazing opportunity by the way: on a powerful enough Pi or BB, one could probably run Processing scripts and output each frame to a matrix. The syntax is extremely simple and could be a huge level up with minimal coding abilities.

Regarding:

There is no API command to achieve that today.  We would welcome a pull request for an implementation of one.

You could draw inspiration from the CopyFileToMappedBlock function in https://github.com/FalconChristmas/fpp/blob/master/src/fppmm.cpp

Contributing to the API is likely above my current coding abilities but let's see how much I learn along the way and I'll try my best.