Java 通信 VLC 的缓冲问题

Question

我是套接字通信的新手，所以我可能是错的，但请提供建议或至少给出方向！

我正在根据 http://www.csee.umbc.edu/~pmundur/courses/CMSC691C/lab5-kurose-ross.html#appendix 查看 http://www.java2s.com/Open-Source/Android/UnTagged/mynpr/com/webeclubbin/mynpr/RTSPserver.java.htm 中的类似代码来实现 RTSP 服务器

目前，我正在实现对选项请求的响应。为了简化第一种方法，我决定根据示例 RTSP 请求/响应日志对答案进行硬编码，该日志是为 vlc 和 gstreamer rtsp 之间的一些实际通信所做的。

因此，使用 vlc URL -vvv 记录的日志说：

Sending request: OPTIONS rtsp://localhost:8554/test RTSP/1.0
CSeq: 2
User-Agent: LibVLC/2.0.8 (LIVE555 Streaming Media v2013.04.30)

Received 183 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 2
Public: OPTIONS, DESCRIBE, GET_PARAMETER, PAUSE, PLAY, SETUP, SET_PARAMETER, TEARDOWN
Server: GStreamer RTSP server
Date: Tue, 10 Sep 2013 19:56:53 GMT

Sending request: DESCRIBE rtsp://localhost:8554/test RTSP/1.0
CSeq: 3
User-Agent: LibVLC/2.0.8 (LIVE555 Streaming Media v2013.04.30)
Accept: application/sdp

即

RTSP/1.0 200 OK
CSeq: 2
Public: OPTIONS, DESCRIBE, GET_PARAMETER, PAUSE, PLAY, SETUP, SET_PARAMETER, TEARDOWN
Server: GStreamer RTSP server
Date: Tue, 10 Sep 2013 19:56:53 GMT

部分长度为 183 字节

我根据示例直接写入缓冲区：

 try{
        System.out.println("S -> C");
        System.out.println("RTSP/1.0 200 OK");
        System.out.println("CSeq: "+RTSPSeqNb);
        //System.out.println("Session: "+RTSP_ID);
        if (responceType==OPTIONS) {System.out.println("Public: OPTIONS, DESCRIBE, GET_PARAMETER, PAUSE, PLAY, SETUP, SET_PARAMETER, TEARDOWN");};
        if (responceType==OPTIONS) {System.out.println("Server: GStreamer RTSP server");                                                        };
        if (responceType==OPTIONS) {System.out.println("Date: Tue, 10 Sep 2013 19:56:53 GMT");};
        RTSPBufferedWriter.write("RTSP/1.0 200 OK"+CRLF);
        RTSPBufferedWriter.write("CSeq: "+RTSPSeqNb+CRLF);
        //RTSPBufferedWriter.write("Session: "+RTSP_ID+CRLF);
        if (responceType==OPTIONS) {RTSPBufferedWriter.write("Public: OPTIONS, DESCRIBE, GET_PARAMETER, PAUSE, PLAY, SETUP, SET_PARAMETER, TEARDOWN"+CRLF);};
        if (responceType==OPTIONS) {RTSPBufferedWriter.write("Server: GStreamer RTSP server"+CRLF);                                                        };
        if (responceType==OPTIONS) {RTSPBufferedWriter.write("Date: Tue, 10 Sep 2013 19:56:53 GMT"+CRLF);            };
        RTSPBufferedWriter.write("Session: "+RTSP_ID+"r"+CRLF);
        RTSPBufferedWriter.flush();
        //RTSPBufferedWriter.newLine();
        System.out.println("RTSP Server - Sent response to Client.");
    }
    catch(IOException ex)
    {
        System.out.println("Exception caught: "+ex.getStackTrace());
        //    System.exit(0);
    }

VLC日志说

Opening connection to 127.0.0.1, port 6666...
...remote connection opened
Sending request: OPTIONS rtsp://127.0.0.1:6666/autostream.mjpg RTSP/1.0
CSeq: 2
User-Agent: LibVLC/2.0.8 (LIVE555 Streaming Media v2013.04.30)

Received 193 new bytes of response data.
[0x7fd01c001178] live555 demux debug: connection timeout
[0x7fd01c001178] live555 demux error: Failed to connect with rtsp://127.0.0.1:6666/autostream.mjpg

其中 CRLF 为""。在我尝试 CRLF="\r"（最后一行没有 +"\r"+ ）之前

Received 198 new bytes of response data.

那么，那里有什么问题呢？vlc在等什么？为什么示例中的默认分度不起作用？

Answer 1

我看起来我总是在将问题发布到 stackoverflow 后找到问题的答案......

DOUBLE CRLF 应位于通常的 RTSP 协议 9 的最后一个标头之后，而不是示例中使用的自定义标头）。