基于ZLMediaKit的webrtc实时视频传输demo搭建

本文介绍: webrtc 启动后，还需要修改配置文件，需要在填写 rtc.extern ip，webrtc 协议需要告知播放器服务器的ip，不过如果是内网环境的话可以不用修改此配置，因为如果为空，会自动读取内网的网卡信息，这样做的话将无法实现跨域NAT使用。$ ln –s /usr/local/openssl/bin/openssl /usr/local/b in/openssl # 替换系统 openssl，非必须。#需要注意的是，如果服务器在nat内，需要做端口映射时，必须确保外网映射端口跟该端口一致。

ubuntu 20.04

gcc version 9.4.0

cmake version 3.16.3

首先可以检查一下自己的openssl的版本如果是1.1.1以上就可以忽略这一步

wget https://www.openssl.org/source/openssl-1.1.1k.tar.gz
tar -xvzf openssl-1.1.1k.tar.gz
yum install -y zlib zlib-devel perl-CPAN   #这一步不是必要
cd openssl-1.1.1k/
./config shared --openssldir=/usr/local/openssl --prefix=/usr/local/openssl
make &amp;&amp; make install
echo "/usr/local/lib64/" &gt;> /etc/ld.so.conf
echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
ldconfig
ln -s /usr/local/openssl/bin/openssl  /usr/local/bin/openssl # 替换系统openssl，非必须
openssl version -a

tar -xvzf libsrtp-2.3.0.tar.gz
cd libsrtp-2.3.0
./configure --enable-openssl --with-openssl-dir=/usr/local/openssl
make -j8 &amp;&amp; make install

其中初始化配置的时候可能会报错，如果报错换成./configure --enable-openssl即可

对于一些比较新的编译环境（如GCC 10+），编译 li bs rt p-2.3.0 可能会存在问题，可以考虑切换到 2.5.0 版本，即

wget https://github.com/cisco/libsrtp/archive/refs/tags/v2.5.0.tar.gz
tar -xvzf libsrtp-2.5.0.tar.gz
cd libsrtp-2.5.0

另外可以安装 ffmpeg进行推流测试

sudo apt-get install ffmpeg

#国内用户推荐从同步镜像网站gitee下载 
git clone --depth 1 https://gitee.com/xia-chu/ZLMediaKit
cd ZLMediaKit
#千万不要忘记执行这句命令
git submodule update --init

编译

$ mkdir build
$ cd build
$ cmake .. -DENABLE_WEBRTC=true  -DOPENSSL_ROOT_DIR=/usr/local/openssl  -DOPENSSL_LIBRARIES=/usr/local/openssl/lib
$ cmake --build . --target MediaServer

# 最终输出
[ 96%] Built target test_rtcp_fci
[ 96%] Building CXX object tests/CMakeFiles/test_rtp.dir/test_rtp.cpp.o
[ 97%] Linking CXX executable ../../release/linux/Debug/test_rtp
[ 97%] Built target test_rtp
[ 97%] Building CXX object tests/CMakeFiles/test_wsServer.dir/test_wsServer.cpp.o
[ 97%] Linking CXX executable ../../release/linux/Debug/test_wsServer
[ 97%] Built target test_wsServer
[ 97%] Building CXX object tests/CMakeFiles/test_server.dir/test_server.cpp.o
[ 97%] Linking CXX executable ../../release/linux/Debug/test_server
[ 97%] Built target test_server
[ 98%] Built target jsoncpp
[ 98%] Linking CXX executable ../../release/linux/Debug/MediaServer
[100%] Built target MediaServer

使用上面命令之后就不用 make && make install了，会在release/debug下生成可执行文件

[rtc]
#rtc播放推流、播放超时时间
timeoutSec=15
#本机对rtc客户端的可见ip，作为服务器时一般为公网ip，置空时，会自动获取网卡ip
externIP=
#rtc udp服务器监听端口号，所有rtc客户端将通过该端口传输stun/dtls/srtp/srtcp数据，
#该端口是多线程的，同时支持客户端网络切换导致的连接迁移
#需要注意的是，如果服务器在nat内，需要做端口映射时，必须确保外网映射端口跟该端口一致
port=8000
#设置remb比特率，非0时关闭twcc并开启remb。该设置在rtc推流时有效，可以控制推流画质
rembBitRate=1000000

127.0.0.1 localhost
127.0.1.1 connect_class

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
10.14.2.7 default.zlmediakit.com

# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

# localhost name resolution is handled within DNS itself.
#   127.0.0.1       localhost
#   ::1             localhost
10.14.2.7 default.zlmediakit.com