added preview option to show decoded stream in Audio config

plugins/VOIP/gui/AudioInputConfig.cpp

@@ -55,9 +55,9 @@ void AudioInputDialog::showEvent(QShowEvent *) {
 class voipGraphSource: public RSGraphSource
 {
 public:
-    voipGraphSource() {}
+    voipGraphSource() : video_input(NULL) {}
     
-    void setVideoInput(QVideoInputDevice *vid) { video_input = vid ; }
+    void setVideoInput(const QVideoInputDevice *vid) { video_input = vid ; }
     
      virtual QString displayName(int) const { return tr("Required bandwidth") ;}
     
@@ -73,21 +73,14 @@ public:
     
     virtual void getValues(std::map<std::string,float>& vals) const
     {
-        RsVOIPDataChunk chunk ;
-        uint32_t total_size = 0 ;
         vals.clear() ;
         
-	while(video_input && video_input->getNextEncodedPacket(chunk))
+	if(video_input)
-	{
+		vals[std::string("bw")] = video_input->currentBandwidth() ;
-                total_size += chunk.size ;
-              chunk.clear() ;  
-	}
-    
-    	vals[std::string("bw")] = (float)total_size ;
     }
     
 private:
-    QVideoInputDevice *video_input ;
+    const QVideoInputDevice *video_input ;
 };
 
 void voipGraph::setVoipSource(voipGraphSource *gs) 
@@ -127,12 +120,31 @@ AudioInputConfig::AudioInputConfig(QWidget * parent, Qt::WindowFlags flags)
 	 videoInput->setEchoVideoTarget(ui.videoDisplay) ;
 	 videoInput->setVideoEncoder(new JPEGVideoEncoder()) ;
      
+     videoDecoder = new JPEGVideoDecoder;
+     videoDecoder->setDisplayTarget(NULL) ;
+             
      graph_source = new voipGraphSource ;
      ui.voipBwGraph->setSource(graph_source);
      
      graph_source->setVideoInput(videoInput) ;
      graph_source->setCollectionTimeLimit(1000*300) ;
      graph_source->start() ;
+     
+     QObject::connect(ui.showEncoded_CB,SIGNAL(toggled(bool)),this,SLOT(togglePreview(bool))) ;
+}
+
+void AudioInputConfig::togglePreview(bool b)
+{
+    if(b)
+    {
+        videoInput->setEchoVideoTarget(NULL) ;
+	videoDecoder->setDisplayTarget(ui.videoDisplay) ;
+    }
+    else
+    {
+        videoInput->setEchoVideoTarget(ui.videoDisplay) ;
+	videoDecoder->setDisplayTarget(NULL) ;
+    }
 }
 
 AudioInputConfig::~AudioInputConfig()
@@ -352,6 +364,15 @@ void AudioInputConfig::on_Tick_timeout() {
         abSpeech->iValue = iroundf(inputAudioProcessor->dVoiceAcivityLevel * 32767.0f + 0.5f);
 
         abSpeech->update();
+        
+        // also transmit encoded video
+    RsVOIPDataChunk chunk ;
+    
+    while(videoInput->getNextEncodedPacket(chunk))
+    {
+        videoDecoder->receiveEncodedData(static_cast<const unsigned char*>(chunk.data),chunk.size) ;
+        chunk.clear() ;
+    }
 }
 
 void AudioInputConfig::emptyBuffer() {

plugins/VOIP/gui/AudioInputConfig.h

@@ -69,6 +69,7 @@ class AudioInputConfig : public ConfigPage
 		//VideoDecoder *videoDecoder ;
 		//VideoEncoder *videoEncoder ;
 		QVideoInputDevice *videoInput ;
+        	VideoDecoder *videoDecoder ;
 		bool loaded;
 
         voipGraphSource *graph_source ;
@@ -96,6 +97,7 @@ class AudioInputConfig : public ConfigPage
 	private slots:
 		void loadSettings();
 		void emptyBuffer();
+		void togglePreview(bool) ;
 
 		void on_qsTransmitHold_valueChanged(int v);
 		void on_qsAmp_valueChanged(int v);

plugins/VOIP/gui/AudioInputConfig.ui

@@ -391,6 +391,16 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QCheckBox" name="showEncoded_CB">
+     <property name="toolTip">
+      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Display encoded (and then decoded) frame, to check the codec's quality. If not selected, the image above only shows the frame that is grabbed from your camera.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+     </property>
+     <property name="text">
+      <string>preview</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <spacer>
      <property name="orientation">

plugins/VOIP/gui/QVideoDevice.cpp

@@ -13,6 +13,9 @@ QVideoInputDevice::QVideoInputDevice(QWidget *parent)
 	_capture_device = NULL ;
 	_video_encoder = NULL ;
 	_echo_output_device = NULL ;
+    	_estimated_bw = 0 ;
+        _total_encoded_size = 0 ;
+        _last_bw_estimate_TS = time(NULL) ;
 }
 
 void QVideoInputDevice::stop()
@@ -73,17 +76,33 @@ void QVideoInputDevice::grabFrame()
     cv::Mat img_rgb;
     cv::cvtColor(cv::Mat(img), img_rgb, CV_BGR2RGB);
 
-	static const int _encoded_width = 128 ;
+    QImage image = QImage(img_rgb.data,img_rgb.cols,img_rgb.rows,QImage::Format_RGB888);
-	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) ;
+	    uint32_t encoded_size ;
+
+	    _video_encoder->addImage(image,0,encoded_size) ;
+
+        std::cerr << "Encoded size = " << encoded_size << std::endl;
+	    _total_encoded_size += encoded_size ;
+
+	    time_t now = time(NULL) ;
+
+	    if(now > _last_bw_estimate_TS)
+	    {
+		    _estimated_bw = uint32_t(0.75*_estimated_bw + 0.25 * (_total_encoded_size / (float)(now - _last_bw_estimate_TS))) ;
+            
+		    _total_encoded_size = 0 ;
+		    _last_bw_estimate_TS = now ;
+            
+            std::cerr << "new bw estimate: " << _estimated_bw << std::endl;
+	    }
+
 	    emit networkPacketReady() ;
     }
-	if(_echo_output_device != NULL) _echo_output_device->showFrame(image) ;
+    if(_echo_output_device != NULL) 
+	    _echo_output_device->showFrame(image) ;
 }
 
 bool QVideoInputDevice::getNextEncodedPacket(RsVOIPDataChunk& chunk)

plugins/VOIP/gui/QVideoDevice.h

@@ -42,6 +42,12 @@ class QVideoInputDevice: public QObject
 		//
 		bool getNextEncodedPacket(RsVOIPDataChunk&) ;
 
+        	// gets the estimated current bandwidth required to transmit the encoded data, in B/s
+        	//
+        	uint32_t currentBandwidth() const { return _estimated_bw ; }
+        
+        	// control
+        
 		void start() ;
 		void stop() ;
 
@@ -59,5 +65,9 @@ class QVideoInputDevice: public QObject
 		QVideoOutputDevice *_echo_output_device ;
 
 		std::list<RsVOIPDataChunk> _out_queue ;
+        
+        	uint32_t _estimated_bw ;
+	    time_t _last_bw_estimate_TS;
+        uint32_t _total_encoded_size ;
 };
 

plugins/VOIP/gui/VideoProcessor.cpp

@@ -12,9 +12,15 @@ VideoDecoder::VideoDecoder()
 	_output_device = NULL ;
 }
 
-bool VideoEncoder::addImage(const QImage& img)
+VideoEncoder::VideoEncoder()
+    :_frame_size(128,128) 
 {
-	encodeData(img) ;
+}
+
+bool VideoEncoder::addImage(const QImage& img,uint32_t size_hint,uint32_t& encoded_size)
+{
+    std::cerr << "reducing to " << _frame_size.width() << " x " << _frame_size.height() << std::endl;
+	encodeData(img.scaled(_frame_size,Qt::IgnoreAspectRatio,Qt::SmoothTransformation),size_hint,encoded_size) ;
 
 	return true ;
 }
@@ -32,6 +38,7 @@ bool VideoEncoder::nextPacket(RsVOIPDataChunk& chunk)
 
 void VideoDecoder::receiveEncodedData(const unsigned char *data,uint32_t size)
 {
+    if(_output_device)
 	_output_device->showFrame(decodeData(data,size)) ;
 }
 
@@ -53,14 +60,42 @@ void VideoEncoder::setMaximumFrameRate(uint32_t bytes_per_sec)
     std::cerr << "Video Encoder: maximum frame rate is set to " << bytes_per_sec << " Bps" << std::endl;
 }
 
-
+void VideoEncoder::setInternalFrameSize(QSize s)
-void JPEGVideoEncoder::encodeData(const QImage& image)
 {
+    _frame_size = s ;
+}
+
+JPEGVideoEncoder::JPEGVideoEncoder()
+	: _ref_frame_max_distance(10),_ref_frame_count(10) 
+{
+}
+
+void JPEGVideoEncoder::encodeData(const QImage& image,uint32_t /* size_hint */,uint32_t& encoded_size)
+{
+    // check if we make a diff image, or if we use the full frame.
+
+    QImage encoded_frame ;
+
+    if(_ref_frame_count++ < _ref_frame_max_distance && image.size() == _reference_frame.size())
+    {
+	    // compute difference with reference frame.
+	    encoded_frame = image ;
+
+	    for(uint32_t i=0;i<image.byteCount();++i)
+		    encoded_frame.bits()[i] = image.bits()[i] - _reference_frame.bits()[i] + 128 ;
+    }
+    else
+    {
+	    _ref_frame_count = 0 ;
+	    _reference_frame = image ;
+	    encoded_frame = image ;
+    }
+
     QByteArray qb ;
 
     QBuffer buffer(&qb) ;
     buffer.open(QIODevice::WriteOnly) ;
-	image.save(&buffer,"JPEG") ;
+    encoded_frame.save(&buffer,"JPEG") ;
 
     RsVOIPDataChunk voip_chunk ;
     voip_chunk.data = malloc(qb.size());
@@ -69,5 +104,7 @@ void JPEGVideoEncoder::encodeData(const QImage& image)
     voip_chunk.type = RsVOIPDataChunk::RS_VOIP_DATA_TYPE_VIDEO ;
 
     _out_queue.push_back(voip_chunk) ;
+
+    encoded_size = voip_chunk.size ;
 }
 

plugins/VOIP/gui/VideoProcessor.h

@@ -49,12 +49,12 @@ class VideoDecoder
 class VideoEncoder
 {
 	public:
-		VideoEncoder() {}
+		VideoEncoder() ;
 		virtual ~VideoEncoder() {}
 
 		// Takes the next image to be encoded. 
 		//
-		bool addImage(const QImage& Image) ;
+		bool addImage(const QImage& Image, uint32_t size_hint, uint32_t &encoded_size) ;
 
 		bool packetReady() const { return !_out_queue.empty() ; }
 		bool nextPacket(RsVOIPDataChunk& ) ;
@@ -62,12 +62,14 @@ class VideoEncoder
 		// Used to tweak the compression ratio so that the video can stream ok.
 		//
 		void setMaximumFrameRate(uint32_t bytes_per_second) ;
+        	void setInternalFrameSize(QSize) ;
             
 	protected:
-		//virtual bool sendEncodedData(unsigned char *mem,uint32_t size) = 0 ;
+		virtual void encodeData(const QImage& Image, uint32_t size_hint, uint32_t &encoded_size) =0;
-		virtual void encodeData(const QImage& image) = 0 ;
 
 		std::list<RsVOIPDataChunk> _out_queue ;
+        
+        	QSize _frame_size ;
 };
 
 // Now derive various image encoding/decoding algorithms.
@@ -77,14 +79,43 @@ class JPEGVideoDecoder: public VideoDecoder
 {
 protected:
     virtual QImage decodeData(const unsigned char *encoded_image,uint32_t encoded_image_size) ;
+    
+private:
+    	QImage _last_reference_frame ;
 };
 
 class JPEGVideoEncoder: public VideoEncoder
 {
 public:
-		JPEGVideoEncoder() {}
+	JPEGVideoEncoder() ;
 
 protected:
-		virtual void encodeData(const QImage& Image) ;
+	virtual void encodeData(const QImage& Image, uint32_t size_hint, uint32_t &encoded_size) ;
+    
+private:
+    	QImage _reference_frame ;
+        uint32_t _ref_frame_max_distance ;	// max distance between two reference frames.
+        uint32_t _ref_frame_count ;
 };
 
+class DifferentialWaveletEncoder: public VideoEncoder
+{
+public:
+	DifferentialWaveletEncoder() {}
+
+protected:
+	virtual void encodeData(const QImage& Image, uint32_t size_hint, uint32_t &encoded_size) ;
+    
+};
+
+class DifferentialWaveletDecoder: public VideoDecoder
+{
+public:
+	DifferentialWaveletDecoder() {}
+
+protected:
+	virtual QImage decodeData(const unsigned char *encoded_image,uint32_t encoded_image_size) ;
+
+private:
+	QImage _last_reference_frame ;
+};

plugins/VOIP/interface/rsVOIP.h

@@ -51,7 +51,9 @@ class RsVOIPPongResult
 
 struct RsVOIPDataChunk
 {
-	typedef enum { RS_VOIP_DATA_TYPE_AUDIO, RS_VOIP_DATA_TYPE_VIDEO } RsVOIPDataType ;
+	typedef enum { 	RS_VOIP_DATA_TYPE_UNKNOWN = 0x00, 
+                   	RS_VOIP_DATA_TYPE_AUDIO   = 0x01, 
+                    	RS_VOIP_DATA_TYPE_VIDEO   = 0x02 } RsVOIPDataType ;
 
 	void *data ; // create/delete using malloc/free.
 	uint32_t size ;