Question

我想创建一个Http Server来发送MJPEG流。我已经能够发送图像但没有实时流。

我做了什么：创建了一个TCP服务器。当客户端连接TCP-Socket时创建。然后我实现了一个ReadyRead SLOT，当浏览器发送＆＃34; GET＆＃34;请求服务器。

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

然后我运行以下代码

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();

我考虑过创建一个循环来重复图像流部分但这不起作用。浏览器只是继续加载，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？编码是错误的还是我处理请求的方式？也许是哑剧型？

更新的我看了一下 http://www.damonkohler.com/2010/10/mjpeg-streaming-protocol.html 和 https://en.wikipedia.org/wiki/Motion_JPEG 并尝试实施这些方法，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();
}

如何使用QTcp-Server套接字创建HTTP MJPEG流服务器？

1 个答案: