HP-UX Multimedia Streaming Protocols (MSP) Programmer's Guide

Figure 1-2 MSP Framework

Multimedia Application

MSP Suite of Protocols

Network Interface

SDP

Media

Control

Media

Packet

User Space

Kernel Space

Hardware

Kernel Space

RTSP

RTP/RTCP

Modules

TCP

UDP

MSP APIs

The HP-UX MSP framework comprises the following modules:

• Real-Time Protocol (RTP)

• Real-Time Control Protocol (RTCP)

• Real-Time Streaming Protocol (RTSP)

• Session Description Protocol (SDP)

The MSP framework contains the RTSP and SDP modules in the user space and the

RTP and RTCP modules in the kernel space. Applications can use the APIs provided

in the user space MSP library to access the kernel components, namely, RTP and RTCP.

Real-Time Protocol

RTP is a transport protocol that provides end-to-end network transport functions for

applications transmitting data with real-time properties, such as interactive audio and

video. Services that use RTP include payload type identification, sequence numbering,

timestamping and delivery monitoring. Applications run RTP on top of the User

Datagram Protocol (UDP). RTP includes RTCP, a closely linked protocol, to provide a

mechanism for reporting feedback on the transmitted real-time data.

You can use RTP in the following scenarios:

MSP Overview 15