RTP (Real-Time Transfer Protocol)

The RTP library provides functions for creating and manipulation RTP packets.

Functionality

Create RTP packets of any length
Create and extract RTP headers

More details in nw_rtp_pkg

Example use

Include the libraries:

library nw_util;
context nw_util.nw_util_context;
library nw_rtp;

Assume the variable v_payload contains the RTP payload. The variables are defined:

variable v_header  : t_rtp_header; -- RTP header record
variable v_rtp_pkt : t_slv_arr(0 to 1500)(7 downto 0); -- byte array
variable v_len     : natural;

First setup the header, then calculate the total RTP packet length before creating the packet.

v_header                  := C_DEFAULT_RTP_HEADER; -- copy default header
v_header.cc               := x"0010"; -- two CSRC identifiers
v_header.csrc(0)          := x"10005678"; -- CSRC #1
v_header.csrc(1)          := x"1000abcd"; -- CSRC #2
v_header.payload_type     := "0100011"; -- payload type
v_len                     := f_rtp_create_pkt_len(v_header, v_payload); -- calculate total packet length
v_rtp_pkt(0 to v_len - 1) := f_rtp_create_pkt(v_header, v_payload); -- create the packet

The variable v_rtp_pkt is an 8-bit array. This can of course be rearranged to any word width with f_repack .

v_rtp_pkt_64 := f_repack(v_rtp_pkt, 64, C_MSB_FIRST); -- repack to 64bit words (padded with zeros if required)

See further examples in the test bench nw_rtp_tb.vhd.

Table of Contents

RTP (Real-Time Transfer Protocol)

Functionality

Example use