Esempio n. 1
0
        /// <summary>
        /// Parse the MJPG stream. This should only return in the case of an
        /// exception accuring.
        /// </summary>
        /// <exception cref="System.ApplicationException">Thrown when
        /// there is a problem with the handling of the stream. See the
        /// string description for more information.</exception>
        //private void getFrames()
        private void getFrames(object sender, DoWorkEventArgs ev)
        {
            BackgroundWorker bw = sender as BackgroundWorker;

            string strHeader = "--myboundary\r\nContent-Type: image/jpeg\r\nContent-Length: ";

            byte[] headerBuffer    = new byte[strHeader.Length];
            string strHeaderBuffer = "";

            int bytesRead = 0;

            // Set the URL to request
            //string strRequest = this.camParams.MjpgParameterString();
            string         strRequest = AxisParameters.MjpgParameterString(this.cameraConfig);
            HttpWebRequest request    = (HttpWebRequest)WebRequest.Create(strRequest);

            // set the username and password
            if (this.cameraConfig.User != null && this.cameraConfig.Password != null)
            {
                request.Credentials = new NetworkCredential(
                    this.cameraConfig.User,
                    this.cameraConfig.Password
                    );
            }

            this.doInfo(this, new ScallopInfoEventArgs("Trying Axis camera with URL " + request.RequestUri.ToString()));

            HttpWebResponse streamResponse = (HttpWebResponse)request.GetResponse();

            this.doInfo(this, new ScallopInfoEventArgs("Server responded with : " + streamResponse.StatusDescription));

            using (BufferedStream mjpgStream = new BufferedStream(streamResponse.GetResponseStream()))
            {
                this.streaming = true;
                this.doOpened(this, EventArgs.Empty);
                while (true)
                {
                    int    contentLen = 0;
                    string aLine      = "";
                    if (bw.CancellationPending == true)
                    {
                        mjpgStream.Close();
                        ev.Cancel = true;
                        return;
                    }

                    /*
                     * HTTP/1.0 200 OK\r\n
                     * Content-Type: multipart/x-mixed-replace;boundary=myboundary\r\n
                     * \r\n
                     * --myboundary\r\n
                     * Content-Type: image/jpeg\r\n
                     * Content-Length: 15656\r\n
                     * \r\n
                     * <JPEG image data>\r\n
                     * --myboundary\r\n
                     * Content-Type: image/jpeg\r\n
                     * Content-Length: 14978\r\n
                     * \r\n
                     * <JPEG image data>\r\n
                     * --myboundary\r\n
                     * Content-Type: image/jpeg\r\n
                     * Content-Length: 15136\r\n
                     * \r\n
                     * <JPEG image data>\r\n
                     * --myboundary\r\n
                     * .
                     * .
                     * .*/

                    bytesRead = 0;

                    // Read --myboundary and Content-Type
                    while ((bytesRead += mjpgStream.Read(headerBuffer,
                                                         bytesRead,
                                                         headerBuffer.Length - bytesRead)) < headerBuffer.Length)
                    {
                        // No op
                    }

                    strHeaderBuffer = System.Text.Encoding.UTF8.GetString(headerBuffer);

                    if (!strHeaderBuffer.Equals(strHeader))
                    {
                        throw new ScallopException("MJPEG header not found");
                    }

                    aLine      = readMjpgLine(mjpgStream);
                    contentLen = int.Parse(aLine);

                    aLine = readMjpgLine(mjpgStream);
                    if (!String.IsNullOrEmpty(aLine)) // empty line
                    {
                        throw new ScallopException("Blank line not found");
                    }

                    // buffer for MJPG frame data
                    byte[] frameBuffer = new byte[contentLen];
                    bytesRead = 0;

                    // read up to contentLen of data to frameBuffer
                    while ((bytesRead += mjpgStream.Read(frameBuffer,
                                                         bytesRead,
                                                         contentLen - bytesRead)) < contentLen)
                    {
                        // No op
                    }

                    aLine = readMjpgLine(mjpgStream);

                    switch (this.cameraConfig.FrameFormat)
                    {
                    case AxisCameraConfigTypeFrameFormat.Jpeg:
                        this.doData(this, new ScallopSensorDataEventArgs(frameBuffer, "New frame"));
                        break;

                    case AxisCameraConfigTypeFrameFormat.SystemDrawingBitmap:
                        using (MemoryStream pixelStream = new MemoryStream(frameBuffer))
                        {
                            Bitmap streamBitmap = new Bitmap(pixelStream);
                            Bitmap bmp          = streamBitmap.Clone() as Bitmap;
                            if (bmp != null)
                            {
                                this.doData(this, new ScallopSensorDataEventArgs(bmp, "New frame"));
                            }
                            streamBitmap.Dispose();
                        }
                        break;

                    case AxisCameraConfigTypeFrameFormat.SystemWindowsMediaImagingBitmapSource:
                        JpegBitmapDecoder decoder = new JpegBitmapDecoder(new MemoryStream(frameBuffer), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                        if (decoder.Frames[0] != null)
                        {
                            this.doData(this, new ScallopSensorDataEventArgs(decoder.Frames[0] as BitmapSource, "New frame"));
                        }
                        break;
                    }
                }
            }
        }
Esempio n. 2
0
        /// <summary>
        /// Parse the MJPG stream. This should only return in the case of an
        /// exception accuring.
        /// </summary>
        /// <exception cref="System.ApplicationException">Thrown when
        /// there is a problem with the handling of the stream. See the
        /// string description for more information.</exception>
        //private void getFrames()
        private void getFrames(object sender, DoWorkEventArgs ev)
        {
            BackgroundWorker bw = sender as BackgroundWorker;

            string delimiter = "--myboundary";

            // Set the URL to request
            //string strRequest = this.camParams.MjpgParameterString();
            string         strRequest = AxisParameters.MjpgParameterString(this.cameraConfig);
            HttpWebRequest request    = (HttpWebRequest)WebRequest.Create(strRequest);

            // set the username and password
            if (this.cameraConfig.User != null && this.cameraConfig.Password != null)
            {
                request.Credentials = new NetworkCredential(
                    this.cameraConfig.User,
                    this.cameraConfig.Password
                    );
            }

            this.doInfo(this, new ScallopInfoEventArgs("Trying Axis camera with URL " + request.RequestUri.ToString()));

            HttpWebResponse streamResponse = (HttpWebResponse)request.GetResponse();

            this.doInfo(this, new ScallopInfoEventArgs("Server responded with : " + streamResponse.StatusDescription));

            using (BufferedStream mjpgStream = new BufferedStream(streamResponse.GetResponseStream()))
            {
                // find the first boundary
                while (!(readMjpgLine(mjpgStream).Equals(delimiter)))
                { /* NO-OP */
                }


                this.streaming = true;
                this.doOpened(this, EventArgs.Empty);
                while (true)
                {
                    int    contentLen = 0;
                    string aLine;
                    if (bw.CancellationPending == true)
                    {
                        mjpgStream.Close();
                        ev.Cancel = true;
                        return;
                    }

                    aLine = readMjpgLine(mjpgStream);
                    if (!aLine.StartsWith("Content-Type: image/jpeg"))
                    {
                        throw new ScallopException("Content-Type not found");
                    }

                    aLine = readMjpgLine(mjpgStream);
                    if (aLine.StartsWith("Content-Length:"))
                    {
                        contentLen = int.Parse(aLine.Substring(15));
                    }
                    else
                    {
                        throw new ScallopException("Content-Length not found");
                    }

                    aLine = readMjpgLine(mjpgStream);
                    if (!String.IsNullOrEmpty(aLine)) // empty line
                    {
                        throw new ScallopException("Blank line not found");
                    }

                    // buffer for MJPG frame data
                    byte[] frameBuffer = new byte[contentLen];
                    int    tmp         = 0;

                    // read up to contentLen of data to frameBuffer
                    while ((tmp += mjpgStream.Read(frameBuffer,
                                                   tmp,
                                                   contentLen - tmp)) < contentLen)
                    {
                        // No op
                    }

                    aLine = readMjpgLine(mjpgStream);
                    while (!aLine.StartsWith(delimiter))
                    {
                        aLine = readMjpgLine(mjpgStream);
                    }

                    switch (this.cameraConfig.FrameFormat)
                    {
                    case AxisCameraConfigTypeFrameFormat.Jpeg:
                        this.doData(this, new ScallopSensorDataEventArgs(frameBuffer, "New frame"));
                        break;

                    case AxisCameraConfigTypeFrameFormat.SystemDrawingBitmap:
                        using (MemoryStream pixelStream = new MemoryStream(frameBuffer))
                        {
                            Bitmap streamBitmap = new Bitmap(pixelStream);
                            Bitmap bmp          = streamBitmap.Clone() as Bitmap;
                            if (bmp != null)
                            {
                                this.doData(this, new ScallopSensorDataEventArgs(bmp, "New frame"));
                            }
                            streamBitmap.Dispose();
                        }
                        break;

                    case AxisCameraConfigTypeFrameFormat.SystemWindowsMediaImagingBitmapSource:
                        JpegBitmapDecoder decoder = new JpegBitmapDecoder(new MemoryStream(frameBuffer), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                        if (decoder.Frames[0] != null)
                        {
                            this.doData(this, new ScallopSensorDataEventArgs(decoder.Frames[0] as BitmapSource, "New frame"));
                        }
                        break;
                    }
                }
            }
        }