Chelsio Communications Chelsio T4 Guía de usuario descargar pdf (Pagina 172)

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Chapter XI. UDP Segmentation Offload and Pacing

Here:

 sockfd : The file descriptor of the UDP socket

 &fs / &cl : Pointer to the framesize and class variables

 sizeof(fs) / sizeof(cl) : The size of the variables

v. Now, compile the application.

4.1.1. UDP offload functionality for RTP data

In case of RTP data, the video server application sends the initial sequence number and the

RTP payload. The USO engine segments the payload data, increments the sequence number

and sends out the data.

In order to use the UDP offload functionality for RTP data, make the following additions to the

steps mentioned above:

1. In step (ii), declare and initialize a new variable in the application:

int rtp_header_size=16;

Here, rtp_header_size is the RTP header size in bytes that the application sends.

2. In step (iii), define a new macro, UDP_RTPHEADERLEN used for setting RTP header

length with the value 292.

# define UDP_RTPHEADERLEN 292

3. In step (iv), define a new socket option:

setsockopt (sockfd,17,UDP_RTPHEADERLEN,&rtp_header_size,

sizeof(rtp_header_size));

Here,

 &rtp_header_size : pointer to the RTP header length variable

 sizeof(rtp_header_size) : the size of the RTP header length variable

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