Modules

Here is a list of all modules:

Speex encoder and decoder	This is the Speex codec itself
SpeexBits: Bit-stream manipulations	This is the structure that holds the bit-stream when encoding or decoding with Speex. It allows some manipulations as well
Various definitions for Speex callbacks supported by the decoder.
SpeexEchoState: Acoustic echo canceller	This is the acoustic echo canceller module
SpeexHeader: Makes it easy to write/parse an Ogg/Speex header	This is the Speex header for the Ogg encapsulation. You don't need that if you just use RTP
JitterBuffer: Adaptive jitter buffer	This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and low latency
SpeexPreprocessState: The Speex preprocessor	This is the Speex preprocessor. The preprocess can do noise suppression, residual echo suppression (after using the echo canceller), automatic gain control (AGC) and voice activity detection (VAD)
SpeexStereoState: Handling Speex stereo files	This describes the Speex intensity stereo encoding/decoding