/// <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;
}
}
}
}
/// <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;
}
}
}
}
