c++ - 如何使用 QTcp-Server 套接字创建 HTTP MJPEG 流媒体服务器？

Question

我想创建一个 Http 服务器来发送 MJPEG 流。我已经可以发送图片，但不能发送直播。

我做了什么:创建了一个 TCP 服务器。当客户端连接时，会创建一个 TCP-Socket。然后我实现了一个 ReadyRead SLOT，它在浏览器向服务器发送“GET”请求时执行。

GET / HTTP/1.1
Host: 127.0.0.1:8889
User-Agent: Mozilla/5.0...

然后我运行下面的代码

QString inbound = m_Client->readAll();

QByteArray header = "HTTP/1.1 200 OK\r\n";
m_Client->write(header);

QByteArray ContentType = "Content-Type: image/jpeg\r\n\n";
m_Client->write(ContentType);

Mat first_img; //OPENCV Material
m_Stream->read(first_img); // Read Image from Webcam
QImage img = Mat2QImage(first_img); // Convert to QImage
QByteArray ba; // QByteArray as Buffer for JPG Envoded QImage
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
img.save(&buffer, "JPG");
m_Client->write(ba); // Write The Encoded Image

m_Client->close();

我想过创建一个循环来重复图像流部分 但这不起作用。浏览器一直在加载，没有任何反应....

while(1){
    Mat first_img; //OPENCV Material
    m_Stream->read(first_img); // Read Image from Webcam

    QImage img = Mat2QImage(first_img); // Convert to QImage
    QByteArray ba; // QByteArray as Buffer for JPG Envoded QImage
    QBuffer buffer(&ba);
    buffer.open(QIODevice::WriteOnly);
    img.save(&buffer, "JPG");

    m_Client->write(ba); // Write The Encoded Image

    QThread::usleep(500);
}

我错过了什么？是编码错误还是我处理请求的方式？也许是 mime 类型？

---

更新 我看过
http://www.damonkohler.com/2010/10/mjpeg-streaming-protocol.html 和 https://en.wikipedia.org/wiki/Motion_JPEG 并尝试实现这些方法但没有任何结果....

QString inbound = m_Client->readAll();

QByteArray ContentType = ("HTTP/1.0 200 OK\r\n" \
        "Server: YourServerName\r\n" \
        "Connection: close\r\n" \
        "Max-Age: 0\r\n" \
        "Expires: 0\r\n" \
        "Cache-Control: no-cache, private\r\n" \
        "Pragma: no-cache\r\n" \
        "Content-Type: multipart/x-mixed-replace; " \
        "boundary=--BoundaryString\r\n\r\n");
m_Client->write(ContentType);



while(1){
    Mat first_img; //OPENCV Material
    m_Stream->read(first_img); // Read Image from Webcam

    QImage img = Mat2QImage(first_img); // Convert to QImage
    QByteArray ba; // QByteArray as Buffer for JPG Envoded QImage
    QBuffer buffer(&ba);
    buffer.open(QIODevice::WriteOnly);
    img.save(&buffer, "JPG");

    QByteArray BoundaryString = ("--BoundaryString\r\n" \
                                 "Content-type: image/jpg\r\n\r\n");

    m_Client->write(BoundaryString);
    m_Client->write(ba); // Write The Encoded Image

    QThread::usleep(500);
}

m_Client->close();

Answer 1

我自己解决了.... 我只需要调整一些协议(protocol)相关的东西....

m_TcpHttpClient->readAll(); // Discard "Get Request String"

QByteArray ContentType = ("HTTP/1.0 200 OK\r\n" \
                          "Server: en.code-bude.net example server\r\n" \
                          "Cache-Control: no-cache\r\n" \
                          "Cache-Control: private\r\n" \
                          "Content-Type: multipart/x-mixed-replace;boundary=--boundary\r\n\r\n");

m_TcpHttpClient->write(ContentType);


while(1){

    // Image to Byte Array via OPENCV Method
    std::vector<uchar> buff;
    imencode(".jpg",m_VisualEngine->GetActualFrame(),buff);
    std::string content(buff.begin(), buff.end());
    QByteArray CurrentImg(QByteArray::fromStdString(content));


    QByteArray BoundaryString = ("--boundary\r\n" \
                                 "Content-Type: image/jpeg\r\n" \
                                 "Content-Length: ");

    BoundaryString.append(QString::number(CurrentImg.length()));
    BoundaryString.append("\r\n\r\n");

    m_TcpHttpClient->write(BoundaryString);
    m_TcpHttpClient->write(CurrentImg); // Write The Encoded Image

    m_TcpHttpClient->flush();
}