C++基于webrtc的udp通讯
时间: 2023-07-11 09:25:26 浏览: 80
基于WebRTC的UDP通信需要使用一些第三方库,比如libwebrtc、boost.asio等。以下是一个使用C++编写的基于WebRTC的UDP通信的简单示例:
```cpp
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <webrtc/api/peerconnectioninterface.h>
#include <webrtc/api/test/fakeconstraints.h>
using namespace std;
using namespace boost::asio;
// 本地IP地址
string local_ip = "127.0.0.1";
// 本地端口号
int local_port = 8888;
// 远端IP地址
string remote_ip = "127.0.0.1";
// 远端端口号
int remote_port = 9999;
// 数据缓冲区大小
const int kBufferSize = 1024;
// WebRTC创建的PeerConnection对象
webrtc::PeerConnectionInterface* pc = nullptr;
// 数据接收回调函数
void OnDataChannelMessage(const webrtc::DataBuffer& buffer) {
cout << "Received message: " << buffer.data.data() << endl;
}
// 初始化WebRTC
void InitWebRTC() {
// PeerConnection初始化配置
webrtc::PeerConnectionInterface::RTCConfiguration config;
config.sdp_semantics = webrtc::SdpSemantics::kUnifiedPlan;
config.enable_dtls_srtp = true;
// PeerConnection约束条件
webrtc::PeerConnectionInterface::IceServers servers;
webrtc::PeerConnectionInterface::IceServer server;
server.uri = "stun:stun.l.google.com:19302";
servers.push_back(server);
webrtc::PeerConnectionInterface::RTCConfigurationConstraints constraints;
constraints.servers = servers;
constraints.type = webrtc::PeerConnectionInterface::RTCConfigurationType::kPublic;
// 创建PeerConnection对象
pc = webrtc::CreatePeerConnectionOrError(config, constraints);
if (!pc) {
cerr << "Failed to create PeerConnection" << endl;
return;
}
// 创建数据通道
webrtc::DataChannelInit config;
config.id = 0;
config.negotiated = false;
config.ordered = true;
config.maxRetransmits = -1;
config.maxRetransmitTime = -1;
config.protocol = "";
auto data_channel = pc->CreateDataChannel("test", &config);
if (!data_channel) {
cerr << "Failed to create data channel" << endl;
return;
}
// 注册数据接收回调函数
data_channel->RegisterObserver(new rtc::RefCountedObject<webrtc::DataChannelObserver>(
[](webrtc::DataChannelInterface* channel) {
channel->SetMessageCallback(OnDataChannelMessage);
}));
}
// UDP通信回调函数
void OnUdpReceive(const boost::system::error_code& error, size_t bytes_transferred, ip::udp::socket* socket, char* buffer) {
if (!error || error == boost::asio::error::message_size) {
// 发送数据到WebRTC数据通道
webrtc::DataBuffer data_buffer(
rtc::CopyOnWriteBuffer(buffer, bytes_transferred), true);
if (pc) {
pc->data_channel()->Send(data_buffer);
}
// 继续接收数据
socket->async_receive_from(buffer, ip::udp::endpoint(ip::address::from_string(remote_ip), remote_port),
boost::bind(OnUdpReceive, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, socket, buffer));
}
}
int main() {
// 初始化WebRTC
InitWebRTC();
// 初始化UDP通信
io_service io_service;
ip::udp::endpoint local_endpoint(ip::address::from_string(local_ip), local_port);
ip::udp::endpoint remote_endpoint(ip::address::from_string(remote_ip), remote_port);
ip::udp::socket socket(io_service, local_endpoint);
char buffer[kBufferSize];
socket.async_receive_from(buffer, remote_endpoint, boost::bind(OnUdpReceive, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, &socket, buffer));
// 运行事件循环
io_service.run();
// 释放资源
delete pc;
return 0;
}
```
该示例中,使用Boost.ASIO库创建了一个UDP socket,通过异步接收数据的方式监听来自远端的数据。当接收到数据后,将其发送到WebRTC创建的数据通道中。同时,WebRTC的数据通道也会接收来自远端的数据,并调用通过注册的回调函数进行处理。需要注意的是,该示例仅仅是一个简单的示例,实际应用中还需要根据具体情况进行相应的修改。