RetroShare/plugins/VOIP/gui/QVideoDevice.cpp

#include <opencv/cv.h>
#include <opencv/highgui.h>

#include <QTimer>
#include <QPainter>
#include "QVideoDevice.h"
#include "VideoProcessor.h"

QVideoInputDevice::QVideoInputDevice(QWidget *parent)
  :QObject(parent)
{
	_timer = NULL ;
	_capture_device = NULL ;
	_video_encoder = NULL ;
	_echo_output_device = NULL ;
}

void QVideoInputDevice::stop()
{
	if(_timer != NULL)
	{
		QObject::disconnect(_timer,SIGNAL(timeout()),this,SLOT(grabFrame())) ;
		_timer->stop() ;
		delete _timer ;
		_timer = NULL ;
	}
	if(_capture_device != NULL)
	{
		cvReleaseCapture(&_capture_device) ;
		_capture_device = NULL ;
	}
}
void QVideoInputDevice::start()
{
	// make sure everything is re-initialised 
	//
	stop() ;

	// Initialise la capture  
	static const int cam_id = 0 ;
	_capture_device = cvCaptureFromCAM(cam_id);

	if(_capture_device == NULL)
	{
		std::cerr << "Cannot initialise camera. Something's wrong." << std::endl;
		return ;
	}

	_timer = new QTimer ;
	QObject::connect(_timer,SIGNAL(timeout()),this,SLOT(grabFrame())) ;

	_timer->start(50) ;	// 10 images per second.
}

void QVideoInputDevice::grabFrame()
{
	IplImage *img=cvQueryFrame(_capture_device);    

	if(img == NULL)
	{
		std::cerr << "(EE) Cannot capture image from camera. Something's wrong." << std::endl;
		return ;
	}
	// get the image data

	if(img->nChannels != 3)
	{
		std::cerr << "(EE) expected 3 channels. Got " << img->nChannels << std::endl;
		return ;
	}

    // convert to RGB and copy to new buffer, because cvQueryFrame tells us to not modify the buffer
    cv::Mat img_rgb;
    cv::cvtColor(cv::Mat(img), img_rgb, CV_BGR2RGB);

	static const int _encoded_width = 128 ;
	static const int _encoded_height = 128 ;

    QImage image = QImage(img_rgb.data,img_rgb.cols,img_rgb.rows,QImage::Format_RGB888).scaled(QSize(_encoded_width,_encoded_height),Qt::IgnoreAspectRatio,Qt::SmoothTransformation) ;

	if(_video_encoder != NULL) 
	{
		_video_encoder->addImage(image) ;
		emit networkPacketReady() ;
	}
	if(_echo_output_device != NULL) _echo_output_device->showFrame(image) ;
}

bool QVideoInputDevice::getNextEncodedPacket(RsVOIPDataChunk& chunk)
{
    if(_video_encoder)
	    return _video_encoder->nextPacket(chunk) ;
    else 
	    return false ;
}

QVideoInputDevice::~QVideoInputDevice()
{
	stop() ;
}


QVideoOutputDevice::QVideoOutputDevice(QWidget *parent)
	: QLabel(parent)
{
	showFrameOff() ;
}

void QVideoOutputDevice::showFrameOff()
{
	setPixmap(QPixmap(":/images/video-icon-big.png").scaled(320,256,Qt::KeepAspectRatio,Qt::SmoothTransformation)) ;
}

void QVideoOutputDevice::showFrame(const QImage& img)
{
	setPixmap(QPixmap::fromImage(img).scaled(minimumSize(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation)) ;
}