RTP（Real- timeTransportProtocol）是用于Internet上針對多媒體數據流的一種傳輸協議，做流媒體傳輸方面的應 用離不開RTP協議的實現及使用，為了更加快速地在項目中應用RTP協議實現流媒體的傳輸，我們一般會選擇使用一些RTP庫，例如使用c++語言編寫的 JRTPLIB庫，ORTP 是實現了RTP協議的另一種開源庫，這個庫是純使用c語言編寫

• Written in C, works under Linux (and probably any Unix) and Windows.
• Implement the RFC3550 (RTP) with a easy to use API with high and low level access.
• Includes support for multiples profiles, AV profile (RFC3551) being the one by default.
• Includes a packet scheduler for to send and recv packet "on time", according to their timestamp. Scheduling is optionnal, rtp sessions can remain not scheduled.
• Supports mutiplexing IO, so that hundreds of RTP sessions can be scheduled by a single thread.
• Features an adaptive jitter algorithm for a receiver to adapt to the clockrate of the sender.
• Supports part of RFC2833 for telephone events over RTP.
• The API is well documented using doxygen
• Licensed under the Lesser Gnu Public License.
• RTCP messages sent periodically since 0.7.0 (compound packet including sender report or receiver report + SDES)
• Includes an API to parse incoming RTCP packets.

簡介

ORTP是一個支持RTP以及RFC3550協議的庫，有如下的特性：
（1）使用C語言編寫，可以工作于windows, Linux, 以及 Unix平臺
（2）實現了RFC3550協議，提供簡單易用的API。支持多種配置，RFC3551為默認的配置。
（3）支持單線程下的多個RTP會話，支持自適應抖動處理。
（4）基于GPL版權聲明。

項目主頁：http://www.baiduhome.net/lib/view/home/1334024513702