// Thread entry point
public void WorkerThread()
{
byte[] buffer = new byte[bufSize]; // buffer to read stream
while (true)
{
// reset reload event
reloadEvent.Reset();
HttpWebRequest req = null;
WebResponse resp = null;
Stream stream = null;
byte[] delimiter = null;
byte[] delimiter2 = null;
byte[] boundary = null;
int boundaryLen, delimiterLen = 0, delimiter2Len = 0;
int read, todo = 0, total = 0, pos = 0, align = 1;
int start = 0, stop = 0;
// align
// 1 = searching for image start
// 2 = searching for image end
try
{
// create request
req = (HttpWebRequest)WebRequest.Create(mURL);
// set login and password
//if ((login != null) && (password != null) && (login != ""))
// req.Credentials = new NetworkCredential(login, password);
// get response
resp = req.GetResponse();
// check content type
string ct = resp.ContentType;
if (ct.IndexOf("multipart/x-mixed-replace") == -1)
{
throw new ApplicationException("Invalid URL");
}
// get boundary
ASCIIEncoding encoding = new ASCIIEncoding();
boundary = encoding.GetBytes(ct.Substring(ct.IndexOf("boundary=", 0) + 9));
boundaryLen = boundary.Length;
// get response stream
stream = resp.GetResponseStream();
// loop
while ((!stopEvent.WaitOne(0, true)) && (!reloadEvent.WaitOne(0, true)))
{
// check total read
if (total > bufSize - readSize)
{
total = pos = todo = 0;
}
// read next portion from stream
if ((read = stream.Read(buffer, total, readSize)) == 0)
{
throw new ApplicationException();
}
total += read;
todo += read;
// does we know the delimiter ?
if (delimiter == null)
{
// find boundary
pos = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (pos == -1)
{
// was not found
todo = boundaryLen - 1;
pos = total - todo;
continue;
}
todo = total - pos;
if (todo < 2)
{
continue;
}
// check new line delimiter type
if (buffer[pos + boundaryLen] == 10)
{
delimiterLen = 2;
delimiter = new byte[2] {
10, 10
};
delimiter2Len = 1;
delimiter2 = new byte[1] {
10
};
}
else
{
delimiterLen = 4;
delimiter = new byte[4] {
13, 10, 13, 10
};
delimiter2Len = 2;
delimiter2 = new byte[2] {
13, 10
};
}
pos += boundaryLen + delimiter2Len;
todo = total - pos;
}
// search for image
if (align == 1)
{
start = ByteArrayUtils.Find(buffer, delimiter, pos, todo);
if (start != -1)
{
// found delimiter
start += delimiterLen;
pos = start;
todo = total - pos;
align = 2;
}
else
{
// delimiter not found
todo = delimiterLen - 1;
pos = total - todo;
}
}
// search for image end
while ((align == 2) && (todo >= boundaryLen))
{
stop = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (stop != -1)
{
pos = stop;
todo = total - pos;
// image at stop
lock (this)
{
if (mRawData != IntPtr.Zero)
{
Marshal.FreeHGlobal(mRawData);
mRawData = IntPtr.Zero;
}
mLength = stop - start;
mRawData = Marshal.AllocHGlobal(mLength);
Marshal.Copy(buffer, start, mRawData, stop - start);
}
// shift array
pos = stop + boundaryLen;
todo = total - pos;
Array.Copy(buffer, pos, buffer, 0, todo);
total = todo;
pos = 0;
align = 1;
}
else
{
// delimiter not found
todo = boundaryLen - 1;
pos = total - todo;
}
}
}
}
catch (WebException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// wait for a while before the next try
Thread.Sleep(250);
}
catch (ApplicationException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// wait for a while before the next try
Thread.Sleep(250);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
}
finally
{
// abort request
if (req != null)
{
req.Abort();
req = null;
}
// close response stream
if (stream != null)
{
stream.Close();
stream = null;
}
// close response
if (resp != null)
{
resp.Close();
resp = null;
}
}
// need to stop ?
if (stopEvent.WaitOne(0, true))
{
break;
}
}
}
static async public System.Threading.Tasks.Task <ICaptureProcessor> createCaptureProcessor()
{
string lPresentationDescriptor = "<?xml version='1.0' encoding='UTF-8'?>" +
"<PresentationDescriptor StreamCount='1'>" +
"<PresentationDescriptor.Attributes Title='Attributes of Presentation'>" +
"<Attribute Name='MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_SYMBOLIC_LINK' GUID='{58F0AAD8-22BF-4F8A-BB3D-D2C4978C6E2F}' Title='The symbolic link for a video capture driver.' Description='Contains the unique symbolic link for a video capture driver.'>" +
"<SingleValue Value='MJPEGCaptureProcessor' />" +
"</Attribute>" +
"<Attribute Name='MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME' GUID='{60D0E559-52F8-4FA2-BBCE-ACDB34A8EC01}' Title='The display name for a device.' Description='The display name is a human-readable string, suitable for display in a user interface.'>" +
"<SingleValue Value='MJPEG Capture Processor' />" +
"</Attribute>" +
"</PresentationDescriptor.Attributes>" +
"<StreamDescriptor Index='0' MajorType='MFMediaType_Video' MajorTypeGUID='{73646976-0000-0010-8000-00AA00389B71}'>" +
"<MediaTypes TypeCount='1'>" +
"<MediaType Index='0'>" +
"<MediaTypeItem Name='MF_MT_FRAME_SIZE' GUID='{1652C33D-D6B2-4012-B834-72030849A37D}' Title='Width and height of the video frame.' Description='Width and height of a video frame, in pixels.'>" +
"<Value.ValueParts>" +
"<ValuePart Title='Width' Value='Temp_Width' />" +
"<ValuePart Title='Height' Value='Temp_Height' />" +
"</Value.ValueParts>" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_AVG_BITRATE' GUID='{20332624-FB0D-4D9E-BD0D-CBF6786C102E}' Title='Approximate data rate of the video stream.' Description='Approximate data rate of the video stream, in bits per second, for a video media type.'>" +
"<SingleValue Value='33570816' />" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_MAJOR_TYPE' GUID='{48EBA18E-F8C9-4687-BF11-0A74C9F96A8F}' Title='Major type GUID for a media type.' Description='The major type defines the overall category of the media data.'>" +
"<SingleValue Value='MFMediaType_Video' GUID='{73646976-0000-0010-8000-00AA00389B71}' />" +
"</MediaTypeItem>" +
//"<MediaTypeItem Name='MF_MT_DEFAULT_STRIDE' GUID='{644B4E48-1E02-4516-B0EB-C01CA9D49AC6}' Title='Default surface stride.' Description='Default surface stride, for an uncompressed video media type. Stride is the number of bytes needed to go from one row of pixels to the next.'>" +
// "<SingleValue Value='Temp_Stride' />" +
//"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_FIXED_SIZE_SAMPLES' GUID='{B8EBEFAF-B718-4E04-B0A9-116775E3321B}' Title='The fixed size of samples in stream.' Description='Specifies for a media type whether the samples have a fixed size.'>" +
"<SingleValue Value='False' />" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_FRAME_RATE' GUID='{C459A2E8-3D2C-4E44-B132-FEE5156C7BB0}' Title='Frame rate.' Description='Frame rate of a video media type, in frames per second.'>" +
"<RatioValue Value='1.0'>" +
"<Value.ValueParts>" +
"<ValuePart Title='Numerator' Value='1' />" +
"<ValuePart Title='Denominator' Value='1' />" +
"</Value.ValueParts>" +
"</RatioValue>" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_PIXEL_ASPECT_RATIO' GUID='{C6376A1E-8D0A-4027-BE45-6D9A0AD39BB6}' Title='Pixel aspect ratio.' Description='Pixel aspect ratio for a video media type.'>" +
"<RatioValue Value='1'>" +
"<Value.ValueParts>" +
"<ValuePart Title='Numerator' Value='1' />" +
"<ValuePart Title='Denominator' Value='1' />" +
"</Value.ValueParts>" +
"</RatioValue>" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_ALL_SAMPLES_INDEPENDENT' GUID='{C9173739-5E56-461C-B713-46FB995CB95F}' Title='Independent of samples.' Description='Specifies for a media type whether each sample is independent of the other samples in the stream.'>" +
"<SingleValue Value='True' />" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_SAMPLE_SIZE' GUID='{DAD3AB78-1990-408B-BCE2-EBA673DACC10}' Title='The fixed size of each sample in stream.' Description='Specifies the size of each sample, in bytes, in a media type.'>" +
"<SingleValue Value='Temp_SampleSize' />" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_INTERLACE_MODE' GUID='{E2724BB8-E676-4806-B4B2-A8D6EFB44CCD}' Title='Describes how the frames are interlaced.' Description='Describes how the frames in a video media type are interlaced.'>" +
"<SingleValue Value='MFVideoInterlace_Progressive' />" +
"</MediaTypeItem>" +
"<MediaTypeItem Name='MF_MT_SUBTYPE' GUID='{F7E34C9A-42E8-4714-B74B-CB29D72C35E5}' Title='Subtype GUID for a media type.' Description='The subtype GUID defines a specific media format type within a major type.'>" +
"<SingleValue GUID='{Temp_SubTypeGUID}' />" +
"</MediaTypeItem>" +
"</MediaType>" +
"</MediaTypes>" +
"</StreamDescriptor>" +
"</PresentationDescriptor>";
IPCameraMJPEGCaptureProcessor lICaptureProcessor = new IPCameraMJPEGCaptureProcessor();
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(IPCameraMJPEGCaptureProcessor.mURL);
WebResponse resp = req.GetResponse();
// check content type
string ct = resp.ContentType;
if (ct.IndexOf("multipart/x-mixed-replace") == -1)
{
throw new ApplicationException("Invalid URL");
}
byte[] boundary = null;
int boundaryLen, delimiterLen = 0, delimiter2Len = 0;
Stream stream = null;
// get boundary
ASCIIEncoding encoding = new ASCIIEncoding();
boundary = encoding.GetBytes(ct.Substring(ct.IndexOf("boundary=", 0) + 9));
boundaryLen = boundary.Length;
// get response stream
stream = resp.GetResponseStream();
int read, todo = 0, total = 0, pos = 0, align = 1;
int start = 0, stop = 0;
byte[] buffer = new byte[bufSize];
byte[] delimiter = null;
byte[] delimiter2 = null;
MemoryStream lMemoryStream = null;
do
{
if ((read = stream.Read(buffer, total, readSize)) == 0)
{
throw new ApplicationException();
}
total += read;
todo += read;
// does we know the delimiter ?
if (delimiter == null)
{
// find boundary
pos = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (pos == -1)
{
// was not found
todo = boundaryLen - 1;
pos = total - todo;
continue;
}
todo = total - pos;
if (todo < 2)
{
continue;
}
// check new line delimiter type
if (buffer[pos + boundaryLen] == 10)
{
delimiterLen = 2;
delimiter = new byte[2] {
10, 10
};
delimiter2Len = 1;
delimiter2 = new byte[1] {
10
};
}
else
{
delimiterLen = 4;
delimiter = new byte[4] {
13, 10, 13, 10
};
delimiter2Len = 2;
delimiter2 = new byte[2] {
13, 10
};
}
pos += boundaryLen + delimiter2Len;
todo = total - pos;
}
// search for image
if (align == 1)
{
start = ByteArrayUtils.Find(buffer, delimiter, pos, todo);
if (start != -1)
{
// found delimiter
start += delimiterLen;
pos = start;
todo = total - pos;
align = 2;
}
else
{
// delimiter not found
todo = delimiterLen - 1;
pos = total - todo;
}
}
bool lout = false;
// search for image end
while ((align == 2) && (todo >= boundaryLen))
{
stop = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (stop != -1)
{
pos = stop;
todo = total - pos;
lMemoryStream = new MemoryStream(buffer, start, stop - start);
var l = JpegBitmapDecoder.Create(lMemoryStream, BitmapCreateOptions.None, BitmapCacheOption.None);
if (l != null && l.Frames.Count > 0)
{
var lFrame = l.Frames[0];
lICaptureProcessor.mWidth = lFrame.PixelWidth;
lICaptureProcessor.mHeight = lFrame.PixelHeight;
lout = true;
break;
}
// increment frames counter
//framesReceived++;
//// image at stop
//if (NewFrame != null)
//{
// Bitmap bmp = (Bitmap)Bitmap.FromStream(new MemoryStream(buffer, start, stop - start));
// // notify client
// NewFrame(this, new CameraEventArgs(bmp));
// // release the image
// bmp.Dispose();
// bmp = null;
//}
// shift array
pos = stop + boundaryLen;
todo = total - pos;
//Array.Copy(buffer, pos, buffer, 0, todo);
total = todo;
pos = 0;
align = 1;
}
else
{
// delimiter not found
todo = boundaryLen - 1;
pos = total - todo;
}
}
if (lout)
{
break;
}
} while (true);
stream.Close();
resp.Close();
//System.Windows.Forms.MessageBox.Show(ct);
int lStride = 0;
lock (lICaptureProcessor)
{
if (lICaptureProcessor.mRawData != IntPtr.Zero)
{
Marshal.FreeHGlobal(lICaptureProcessor.mRawData);
lICaptureProcessor.mRawData = IntPtr.Zero;
}
lICaptureProcessor.mLength = stop - start;
lICaptureProcessor.mRawData = Marshal.AllocHGlobal(lICaptureProcessor.mLength);
Marshal.Copy(buffer, start, lICaptureProcessor.mRawData, stop - start);
}
lPresentationDescriptor = lPresentationDescriptor.Replace("Temp_Width", ((uint)lICaptureProcessor.mWidth).ToString());
lPresentationDescriptor = lPresentationDescriptor.Replace("Temp_Height", ((uint)lICaptureProcessor.mHeight).ToString());
lPresentationDescriptor = lPresentationDescriptor.Replace("Temp_Stride", lStride.ToString());
lPresentationDescriptor = lPresentationDescriptor.Replace("Temp_SampleSize", ((uint)(lICaptureProcessor.mWidth * lICaptureProcessor.mHeight * 4)).ToString());
lPresentationDescriptor = lPresentationDescriptor.Replace("Temp_SubTypeGUID", MFVideoFormat_MJPG.ToString());
lICaptureProcessor.mPresentationDescriptor = lPresentationDescriptor;
}
return(lICaptureProcessor);
}