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# libtheora Documentation

### 1.0alpha8

## Introduction

This is the documentation for `libtheora` C API. The current reference implementation for Theora, a free, patent-unencumbered video codec. Theora is derived from On2's VP3 codec with additional features and integration for Ogg multimedia formats by the Xiph.Org Foundation. Complete documentation of the format itself is available in the Theora specification.

### Organization

The functions documented here are actually subdivided into two separate libraries:

- `libtheoradec`, contains the decoder and shared routines. You must link to this if you use any of the functions listed in this API, i.e., those listed in Functions Shared by Encode and Decode and Functions for Decoding.