FFmpeg-RaspberryPi/HttpServer.cpp at main · neural-bit/FFmpeg-RaspberryPi · GitHub

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#include "HttpServer.h"

#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <unistd.h>

#include <cstring>
#include <iostream>
#include <sstream>

namespace {
constexpr const char* kBoundary = "camerawebframe";

const char* kIndexHtml =
    "<!DOCTYPE html>\n"
    "<html><head><title>camera-web</title>"
    "<style>body{background:#111;margin:0;display:flex;align-items:center;"
    "justify-content:center;height:100vh}img{max-width:100%;max-height:100%}</style>"
    "</head><body><img src=\"/stream\"></body></html>\n";
}

HttpServer::HttpServer(int port) : port_(port) {}

HttpServer::~HttpServer()
{
    stop();
}

bool HttpServer::start()
{
    listenFd_ = socket(AF_INET, SOCK_STREAM, 0);
    if (listenFd_ < 0)
    {
        std::cerr << "[HttpServer] socket() failed: " << strerror(errno) << "\n";
        return false;
    }

    int opt = 1;
    setsockopt(listenFd_, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = INADDR_ANY;
    addr.sin_port = htons(static_cast<uint16_t>(port_));

    if (bind(listenFd_, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0)
    {
        std::cerr << "[HttpServer] bind() failed on port " << port_ << ": " << strerror(errno) << "\n";
        close(listenFd_);
        listenFd_ = -1;
        return false;
    }

    if (listen(listenFd_, 16) < 0)
    {
        std::cerr << "[HttpServer] listen() failed: " << strerror(errno) << "\n";
        close(listenFd_);
        listenFd_ = -1;
        return false;
    }

    running_ = true;
    acceptThread_ = std::thread(&HttpServer::acceptLoop, this);

    std::cerr << "[HttpServer] listening on http://0.0.0.0:" << port_ << "\n";
    return true;
}

void HttpServer::stop()
{
    if (!running_) return;

    running_ = false;

    if (listenFd_ >= 0)
    {
        shutdown(listenFd_, SHUT_RDWR);
        close(listenFd_);
        listenFd_ = -1;
    }

    frameCv_.notify_all();

    if (acceptThread_.joinable())
        acceptThread_.join();
}

void HttpServer::pushFrame(std::vector<uint8_t> jpegData)
{
    {
        std::lock_guard<std::mutex> lock(frameMutex_);
        latestFrame_ = std::move(jpegData);
        ++frameId_;
    }
    frameCv_.notify_all();
}

void HttpServer::acceptLoop()
{
    while (running_)
    {
        sockaddr_in clientAddr{};
        socklen_t clientLen = sizeof(clientAddr);

        int clientFd = accept(listenFd_, reinterpret_cast<sockaddr*>(&clientAddr), &clientLen);
        if (clientFd < 0)
        {
            if (running_)
                std::cerr << "[HttpServer] accept() failed: " << strerror(errno) << "\n";
            continue;
        }

        int nodelay = 1;
        setsockopt(clientFd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay));

        std::thread(&HttpServer::handleClient, this, clientFd).detach();
    }
}

bool HttpServer::sendAll(int fd, const char* data, size_t len)
{
    size_t sent = 0;
    while (sent < len)
    {
        ssize_t n = send(fd, data + sent, len - sent, MSG_NOSIGNAL);
        if (n <= 0)
            return false;
        sent += static_cast<size_t>(n);
    }
    return true;
}

void HttpServer::handleClient(int clientFd)
{
    // Read (and discard) the request line / headers - we only care about
    // the path, and only support GET / and GET /stream.
    char buf[2048];
    ssize_t n = recv(clientFd, buf, sizeof(buf) - 1, 0);
    if (n <= 0)
    {
        close(clientFd);
        return;
    }
    buf[n] = '\0';

    std::string request(buf);
    std::string path = "/";
    {
        size_t methodEnd = request.find(' ');
        size_t pathEnd = request.find(' ', methodEnd + 1);
        if (methodEnd != std::string::npos && pathEnd != std::string::npos)
            path = request.substr(methodEnd + 1, pathEnd - methodEnd - 1);
    }

    if (path == "/" || path == "/index.html")
    {
        std::ostringstream header;
        header << "HTTP/1.1 200 OK\r\n"
                << "Content-Type: text/html\r\n"
                << "Content-Length: " << strlen(kIndexHtml) << "\r\n"
                << "Connection: close\r\n\r\n";
        sendAll(clientFd, header.str().c_str(), header.str().size());
        sendAll(clientFd, kIndexHtml, strlen(kIndexHtml));
        close(clientFd);
        return;
    }

    if (path != "/stream")
    {
        static const char* notFound =
            "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\nConnection: close\r\n\r\n";
        sendAll(clientFd, notFound, strlen(notFound));
        close(clientFd);
        return;
    }


    std::ostringstream header;
    header << "HTTP/1.1 200 OK\r\n"
           << "Cache-Control: no-cache, private\r\n"
           << "Pragma: no-cache\r\n"
           << "Content-Type: multipart/x-mixed-replace; boundary=" << kBoundary << "\r\n"
           << "Connection: close\r\n\r\n";

    if (!sendAll(clientFd, header.str().c_str(), header.str().size()))
    {
        close(clientFd);
        return;
    }

    clientCount_++;
    std::cerr << "[HttpServer] client connected (" << clientCount_.load() << " active)\n";

    uint64_t lastFrameId = 0;
    bool ok = true;

    while (running_ && ok)
    {
        std::vector<uint8_t> frame;
        {
            std::unique_lock<std::mutex> lock(frameMutex_);
            frameCv_.wait(lock, [&] {
                return !running_ || frameId_ != lastFrameId;
            });
            if (!running_)
                break;
            frame = latestFrame_;
            lastFrameId = frameId_;
        }

        std::ostringstream part;
        part << "--" << kBoundary << "\r\n"
             << "Content-Type: image/jpeg\r\n"
             << "Content-Length: " << frame.size() << "\r\n\r\n";

        ok = sendAll(clientFd, part.str().c_str(), part.str().size());
        if (ok)
            ok = sendAll(clientFd, reinterpret_cast<const char*>(frame.data()), frame.size());
        if (ok)
            ok = sendAll(clientFd, "\r\n", 2);
    }

    close(clientFd);
    clientCount_--;
    std::cerr << "[HttpServer] client disconnected (" << clientCount_.load() << " active)\n";
}