Started implementation of Video Chat (not working yet!).

- GUI part is done
- implemented a very basic JPEG codec
- added echo frame in configuration panel
- created a video capture object that uses OpenCV (should be cross systems)
Remains to do:
- serialise and send frames through p3VoRS
- use a serious codec (e.g. Theora+x264)
- add icons to reflect camera state (failure/working/sending/...)
- compilation on windows 



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7449 b45a01b8-16f6-495d-af2f-9b41ad6348cc

plugins/VOIP/gui/VideoProcessor.cpp

@@ -0,0 +1,60 @@
+#include <iostream>
+
+#include <QByteArray>
+#include <QBuffer>
+#include <QImage>
+
+#include "VideoProcessor.h"
+#include "QVideoDevice.h"
+
+//bool VideoDecoder::getNextImage(QImage& image)
+//{
+//	if(_image_queue.empty())
+//		return false ;
+//
+//	image = _image_queue.front() ;
+//	_image_queue.pop_front() ;
+//
+//	return true ;
+//}
+
+bool VideoEncoder::addImage(const QImage& img)
+{
+	std::cerr << "VideoEncoder: adding image." << std::endl;
+
+	encodeData(img) ;
+
+	if(_echo_output_device != NULL)
+		_echo_output_device->showFrame(img) ;
+
+	return true ;
+}
+
+void VideoDecoder::receiveEncodedData(const unsigned char *data,uint32_t size)
+{
+	_output_device->showFrame(decodeData(data,size)) ;
+}
+
+QImage JPEGVideoDecoder::decodeData(const unsigned char *encoded_image_data,uint32_t size)
+{
+	QByteArray qb((char*)encoded_image_data,size) ;
+	QImage image ;
+	if(image.loadFromData(qb))
+		return image ;
+	else
+		return QImage() ;
+}
+
+void JPEGVideoEncoder::encodeData(const QImage& image)
+{
+	QByteArray qb ;
+	
+	QBuffer buffer(&qb) ;
+	buffer.open(QIODevice::WriteOnly) ;
+	image.save(&buffer,"JPEG") ;
+
+	//destination_decoder->receiveEncodedData((unsigned char *)qb.data(),qb.size()) ;
+
+	std::cerr <<"sending encoded data. size = " << qb.size() << std::endl;
+}
+