Fix minor errors when loading images with opencv

lib/LibOpenCVHandler.cpp

@@ -83,22 +83,22 @@ std::vector<std::string> LibOpenCVHandler::supportedSaveFormatsName()
   return formatsName;
 }
 
-Bool LibOpenCVHandler::loadFrame( PlaYUVerFrame* pcFrame, std::string filename )
+PlaYUVerFrame* LibOpenCVHandler::loadFrame( std::string filename )
 {
   cv::Mat pcCvFrame = cv::imread( filename );
-
+  Int cvChannels = pcCvFrame.channels();
   std::string pelFormatName;
-  Int iPelFormat;
-  switch( pcCvFrame.channels() )
+  Int iPelFormat = -1;
+  switch( cvChannels )
   {
   case 1:
     pelFormatName = "GRAY";
     break;
-  case 4:
-    pelFormatName = "RGB8";
+  case 3:
+    pelFormatName = "BRG24";
     break;
   default:
-    return false;
+    return NULL;
   }
 
   for( UInt i = 0; i < PlaYUVerFrame::supportedPixelFormatListNames().size(); i++ )
@@ -109,12 +109,18 @@ Bool LibOpenCVHandler::loadFrame( PlaYUVerFrame* pcFrame, std::string filename )
       break;
     }
   }
-  return true;
+
+  if( iPelFormat >= 0 )
+  {
+    PlaYUVerFrame* pcFrame = new PlaYUVerFrame( pcCvFrame.cols, pcCvFrame.rows, iPelFormat );
+    pcFrame->frameFromBuffer( pcCvFrame.ptr(), pcFrame->getBytesPerFrame() );
+    return pcFrame;
+  }
+  return NULL;
 }
 
 Bool LibOpenCVHandler::saveFrame( PlaYUVerFrame* pcFrame, std::string filename )
 {
-
   Int cvType = CV_8UC3;
   switch( pcFrame->getNumberChannels() )
   {