问在ASP.NET核中将RTSP流从IP摄像机转发到浏览器

EN

    <recording diskid="SD_DISK" recordingid="20211109_122753_1AB3_B8A44F2D0300" starttime="2021-11-09T11:27:53.060281Z" starttimelocal="2021-11-09T12:27:53.060281+01:00" stoptime="2021-11-09T11:43:01.125987Z" stoptimelocal="2021-11-09T12:43:01.125987+01:00" recordingtype="continuous" eventid="continuous" eventtrigger="continuous" recordingstatus="completed" source="1" locked="No">
        <video mimetype="video/x-h264" width="800" height="600" framerate="15:1" resolution="800x600"/>
    </recording>

rtsp://192.168.0.125/axis-media/media.amp?recordingid=20211109_140710_E1A3_B8A44F2D0300

[HttpGet("RecordingsDemo")]
    public async Task<IActionResult> RecordingsDemo() {
        string deviceIp = "rtsp://192.168.0.125";
        string recordingUri = "rtsp://192.168.0.125/axis-media/media.amp?recordingid=20211109_140710_E1A3_B8A44F2D0300";
        Uri playRequestUri = new Uri(recordingUri);

        CancellationTokenSource cts = new CancellationTokenSource();
        NetworkCredential networkCredential = new NetworkCredential("user", "password");
        ConnectionParameters connectionParameters = new ConnectionParameters(new Uri(deviceIp), networkCredential);
        RtspTcpTransportClient RtspTcpClient = new RtspTcpTransportClient(connectionParameters);
        await RtspTcpClient.ConnectAsync(cts.Token);

        RtspRequestMessage message = new RtspRequestMessage(RtspMethod.SETUP, playRequestUri);
        message.AddHeader("Transport", "RTP/AVP/TCP;unicast");
        RtspResponseMessage response = await RtspTcpClient.EnsureExecuteRequest(message, cts.Token);
        System.Collections.Specialized.NameValueCollection headers = response.Headers;
        string sessionId = headers["SESSION"];
        if (sessionId == null) { throw new Exception("RTSP initialization failed: no session id returned from SETUP command"); }
        message = new RtspRequestMessage(RtspMethod.PLAY, playRequestUri, sessionId);
        response = await RtspTcpClient.EnsureExecuteRequest(message, cts.Token);
        Stream stream = RtspTcpClient.GetStream();
        if (stream != null) {
            Response.Headers.Add("Cache-Control", "no-cache");
            FileStreamResult result = new FileStreamResult(stream, "video/x-h264") {
                EnableRangeProcessing = true
            };
            return result;
        } else {
            return new StatusCodeResult((int)HttpStatusCode.ServiceUnavailable);
        }
        return new StatusCodeResult((int)HttpStatusCode.OK);
    }

    public uint _lastCSeqUsed { get; private set; }

    /// <param name="method">SETUP, PLAY etc</param>
    /// <param name="connectionUri">rtsp://<servername>/axis-media/media.amp?recordingid=...</param>
    /// <param name="cSeq">Method that generate the sequence number. The receiver will reply with the same sequence number</param>
    /// <param name="protocolVersion">Default to 1.0 if omitted or null</param>
    /// <param name="userAgent">Doesn't matter really</param>
    /// <param name="session">This parameter has to be initialized with the value returned by the SETUP method</param>
    public RtspRequestMessage(RtspMethod method, Uri connectionUri, string session = "", Func<uint> cSeqProvider = null, 
        Version protocolVersion = null, string userAgent = "client")
        : base((protocolVersion != null) ? protocolVersion : new Version("1.0"))
    {
        Method = method;
        ConnectionUri = connectionUri;
        UserAgent = userAgent;

        _cSeqProvider = (cSeqProvider != null) ? cSeqProvider : myfun;
        CSeq = (cSeqProvider != null) ? _cSeqProvider() : 0;

        if (!string.IsNullOrEmpty(session))
            Headers.Add("Session", session);
    }

    public void AddHeader(string name, string value)
    {
        Headers.Add(name, value);
    }

    private uint myfun()
    {
        return ++CSeq;
    }