Add Cmake

Hi! I would like to create rust bindings to speex for simple echo cancellation library. It will be cross platform and support Windows/Linux/macOS. I noticed that speex lack CMake. can we add it for easier integration? In addition I couldn't find any example usage for echo cancellation. it seems that there's only 4-6 functions related to that but it still looks complicated. Do you have some example? I would like to filter out TTS samples from microphone input for voice assistant engine written in Rust so the user can interrupt voice assistant while the TTS is speaking and VAD will detect it correctly.

So a few things:

• echo cancellation is part of the speexdsp library, this repository is strictly for the Speex Codec library (they used to be a single library so you're not the first to mix up the two).

• I wouldn't be opposed to someone sending patches (including CI coverage) for CMake as has been already done for some Xiph projects. That said if we're adding a build system I'd rather see patches to add support for meson.

• re: rust, have you looked at https://github.com/rust-av/speexdsp-rs ? They've already done bindings and are working on pure rust implementations of the speexdsp library

I just created https://github.com/thewh1teagle/aec-rs

Does the PRs allowed in https://github.com/xiph/speexdsp/pulls instead of Gitlab? because I added PR for CMake there. Also worth mentioning in the readme of this repo that it's not part of speexdsp

That said if we're adding a build system I'd rather see patches to add support for meson.

One step ahead of you: !12 (merged) ;)

Indeed! But I'm talking about for SpeexDSP (probably easy to port that one).

Ah, right, sorry.

A SpeexDSP meson port seems to exist in wrapdb: https://github.com/mesonbuild/wrapdb/tree/master/subprojects/packagefiles/speexdsp

I'm not sure how complete it is, but it should be a good starting point at least.

Why Meson? it doesn't work well cross platform compared to CMake.

Meson definitely works well cross-platform, as evidenced by it being used to build complex projects like dav1d, gstreamer and soon vlc across a wide range of OSes and architectures. It's also much more readable than CMake IMO, and I suspect faster.