MovieDecoder.C

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00001 /*!@file Media/MovieDecoder.C */
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: Rob Peters <rjpeters at usc dot edu>
00034 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/Media/MovieDecoder.C $
00035 // $Id: MovieDecoder.C 9547 2008-03-28 23:32:43Z rjpeters $
00036 //
00037 
00038 #ifndef MEDIA_MOVIEDECODER_C_DEFINED
00039 #define MEDIA_MOVIEDECODER_C_DEFINED
00040 
00041 #include "Media/MovieDecoder.H"
00042 
00043 #include "Util/log.H"
00044 
00045 // ######################################################################
00046 MovieDecoder::~MovieDecoder() {}
00047 
00048 // ######################################################################
00049 bool MovieDecoder::setFrameNumber(int n)
00050 {
00051   if (n < this->apparentFrameNumber())
00052     LFATAL("can't seek backwards in an movie stream "
00053            "(requested frame %d, but current frame is %d)",
00054            n, this->apparentFrameNumber());
00055 
00056   while (n > this->apparentFrameNumber())
00057     {
00058       // read and discard frames until we get up to the desired frame
00059       // number
00060       if (this->apparentFrameNumber() % 200 == 0)
00061         LINFO("seeking to frame %d (currently at frame %d)",
00062               n, this->apparentFrameNumber());
00063       const bool gotframe = this->readAndDiscardFrame();
00064       if (!gotframe)
00065         {
00066           LINFO("end-of-stream at frame %d while trying to seek "
00067                 "to frame %d",
00068                 this->apparentFrameNumber(), n);
00069 
00070           return false;
00071         }
00072     }
00073 
00074   return true;
00075 }
00076 
00077 // ######################################################################
00078 /* So things look consistent in everyone's emacs... */
00079 /* Local Variables: */
00080 /* mode: c++ */
00081 /* indent-tabs-mode: nil */
00082 /* End: */
00083 
00084 #endif // MEDIA_MOVIEDECODER_C_DEFINED
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