Filters

Introduction

In Nim you can create your custom filters as you would normally do in C or C++.

Python example

In VapourSynth, you can create a filter in pure Python as shown here. It is really easy (10 lines of code), but as the author mentioned, it is “exceptionally slow”.

C filters

In order to develop a filter in C, you need to include in a plugin or just to define a function. In any case, you need to fulfill the API depicted [here](/VapourSynth plugin/).

For example the crop filter in the std

Nim filters

You have two options.

Implementing the C API

You can always implement the C API as in mycrop.nim example.

This might be necessary in very particular cases, where you modify substancially the frame format.

Using a macro

I created a macro in order to make easier the development of filters.

This makes the creating of filters simple without having any impact on speed (this is because the macro creates all the required functions at compile time, not at runtime).

Performance

The question is how fast is this. It is fast as C, but right now I am not comparing apples to apples yet.

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