CachedFrameLoader.C

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00001 /*!@file NeovisionII/NeoAnnotate/CachedFrameLoader.C Cached interface to InputFrameSeries */
00002 
00003 // //////////////////////////////////////////////////////////////////// //
00004 // The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2000-2005   //
00005 // by the University of Southern California (USC) and the iLab at USC.  //
00006 // See http://iLab.usc.edu for information about this project.          //
00007 // //////////////////////////////////////////////////////////////////// //
00008 // Major portions of the iLab Neuromorphic Vision Toolkit are protected //
00009 // under the U.S. patent ``Computation of Intrinsic Perceptual Saliency //
00010 // in Visual Environments, and Applications'' by Christof Koch and      //
00011 // Laurent Itti, California Institute of Technology, 2001 (patent       //
00012 // pending; application number 09/912,225 filed July 23, 2001; see      //
00013 // http://pair.uspto.gov/cgi-bin/final/home.pl for current status).     //
00014 // //////////////////////////////////////////////////////////////////// //
00015 // This file is part of the iLab Neuromorphic Vision C++ Toolkit.       //
00016 //                                                                      //
00017 // The iLab Neuromorphic Vision C++ Toolkit is free software; you can   //
00018 // redistribute it and/or modify it under the terms of the GNU General  //
00019 // Public License as published by the Free Software Foundation; either  //
00020 // version 2 of the License, or (at your option) any later version.     //
00021 //                                                                      //
00022 // The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope  //
00023 // that it will be useful, but WITHOUT ANY WARRANTY; without even the   //
00024 // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //
00025 // PURPOSE.  See the GNU General Public License for more details.       //
00026 //                                                                      //
00027 // You should have received a copy of the GNU General Public License    //
00028 // along with the iLab Neuromorphic Vision C++ Toolkit; if not, write   //
00029 // to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,   //
00030 // Boston, MA 02111-1307 USA.                                           //
00031 // //////////////////////////////////////////////////////////////////// //
00032 //
00033 // Primary maintainer for this file:
00034 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/NeovisionII/NeoAnnotate/CachedFrameLoader.C $
00035 // $Id: CachedFrameLoader.C 13844 2010-08-30 21:00:19Z rand $
00036 //
00037 
00038 #include "NeovisionII/NeoAnnotate/CachedFrameLoader.H"
00039 #include "Component/ModelComponent.H"
00040 #include "Image/Image.H"
00041 #include "Image/PixelsTypes.H"
00042 #include "QtUtil/ImageConvert4.H"
00043 
00044 CachedFrameLoader::CachedFrameLoader() :
00045   itsVideoDecoder(NULL),
00046   itsDims(0,0)
00047 {
00048   // Set our cache size, and clear the cache:
00049   int cacheSize_mb = 1000;
00050   QPixmapCache::setCacheLimit(cacheSize_mb * 1024);
00051   QPixmapCache::clear();
00052 }
00053 
00054 QImage CachedFrameLoader::getFrame(int frameNum)
00055 {
00056   if(itsVideoDecoder == NULL) return QImage();
00057 
00058   //Tell the input frameseries to seek to the current frame
00059   itsVideoDecoder->setFrameNumber(frameNum);
00060 
00061   //Read the current frame, convert it, and cache it
00062   return convertToQImage4(itsVideoDecoder->readFrame().asRgb());
00063 
00064 //  //Create a hash key for the requested frame (just the framenumber in string form)
00065 //  QString key = QString("%1").arg(frameNum);
00066 //  QImage ret;
00067 //
00068 //  //Try to look up the frame in our frame cache
00069 //  if(!QPixmapCache::find(key, ret))
00070 //  {
00071 //    //Tell the input frameseries to seek to the current frame
00072 //    itsIfs->setFrameNumber(frameNum);
00073 //
00074 //    //Read the current frame, convert it, and cache it
00075 //    ret = convertToQPixmap4(itsIfs->readRGB());
00076 //
00077 //    //Insert the frame into the cache
00078 //    QPixmapCache::insert(key, ret);
00079 //  }
00080 //
00081 //  return ret;
00082 }
00083 
00084 Dims CachedFrameLoader::getDims() const
00085 {
00086   return itsDims;
00087 }
00088 
00089 FrameRange CachedFrameLoader::getFrameRange() const
00090 {
00091   if(itsVideoDecoder == NULL) return FrameRange(0,0,0);
00092   return FrameRange(0, 1, itsVideoDecoder->getNumFrames());
00093 }
00094 
00095 bool CachedFrameLoader::loadVideo(QString filename)
00096 {
00097   itsDims = Dims(0,0);
00098   if(itsVideoDecoder) delete itsVideoDecoder;
00099 
00100   itsVideoDecoder = new MgzJDecoder(filename.toStdString().c_str());
00101 
00102   itsVideoDecoder->setFrameNumber(0);
00103   itsDims = itsVideoDecoder->readFrame().getDims();
00104 
00105   return true;
00106 }
00107 
00108 
00109 // ######################################################################
00110 /* So things look consistent in everyone's emacs... */
00111 /* Local Variables: */
00112 /* mode: c++ */
00113 /* indent-tabs-mode: nil */
00114 /* End: */
00115 
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