How to use "speex" to encode / decode audio in iphone? I do not get the framework to add to the project.
This post : Speex compilation for Clifton Craig's iPhone should be helpful. Be careful though I have not tried this myself.
For those who stumbled upon this old thread: Yes Speex works on the phone. You must copy the source libogg and libspeex folders to make it work.
Your question is rather vague, but you can read this thread where they claim that Speex works in real time on the iPhone.
Disclosure: I am a developer, and this is not a free solution, unlike the Cliff great post that links alan-p .
However, SpeexKit is a file-based and buffer-based Speex encoding and decoding environment wrapped in Objective-C methods.