Dirac - A Video Codec

Created by the British Broadcasting Corporation.


upconvert.h

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00001 /* ***** BEGIN LICENSE BLOCK *****
00002 *
00003 * $Id: upconvert.h,v 1.12 2007/09/03 14:52:40 asuraparaju Exp $ $Name: Dirac_0_8_0 $
00004 *
00005 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00006 *
00007 * The contents of this file are subject to the Mozilla Public License
00008 * Version 1.1 (the "License"); you may not use this file except in compliance
00009 * with the License. You may obtain a copy of the License at
00010 * http://www.mozilla.org/MPL/
00011 *
00012 * Software distributed under the License is distributed on an "AS IS" basis,
00013 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
00014 * the specific language governing rights and limitations under the License.
00015 *
00016 * The Original Code is BBC Research and Development code.
00017 *
00018 * The Initial Developer of the Original Code is the British Broadcasting
00019 * Corporation.
00020 * Portions created by the Initial Developer are Copyright (C) 2004.
00021 * All Rights Reserved.
00022 *
00023 * Contributor(s): Richard Felton (Original Author), Thomas Davies
00024 *
00025 * Alternatively, the contents of this file may be used under the terms of
00026 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
00027 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
00028 * the GPL or the LGPL are applicable instead of those above. If you wish to
00029 * allow use of your version of this file only under the terms of the either
00030 * the GPL or LGPL and not to allow others to use your version of this file
00031 * under the MPL, indicate your decision by deleting the provisions above
00032 * and replace them with the notice and other provisions required by the GPL
00033 * or LGPL. If you do not delete the provisions above, a recipient may use
00034 * your version of this file under the terms of any one of the MPL, the GPL
00035 * or the LGPL.
00036 * ***** END LICENSE BLOCK ***** */
00037 
00038 #ifndef _UPCONVERT_H_
00039 #define _UPCONVERT_H_
00040 
00041 #include <libdirac_common/common.h>
00042 
00043 namespace dirac
00044 {
00045     //Optimised upconversion class - no array resizes.
00046     //Uses integer math - no floats!
00047     //
00048 
00050 
00053     class UpConverter
00054     {
00055 
00056     public:
00057 
00059         UpConverter(int min_val, int max_val, int orig_xlen, int orig_ylen);
00060 
00062         ~UpConverter() {};
00063 
00065 
00070         void DoUpConverter(const PicArray& pic_data, PicArray& up_data);
00071 
00072     private:
00074         UpConverter(const UpConverter& cpy);
00075 
00077         UpConverter& operator=(const UpConverter& rhs);
00078 
00080         void RowLoop(PicArray& up_data, const int row_num );
00081 
00082     private:
00083         //Variable to keep the loops in check
00084         int m_width_old, m_height_old;
00085         int m_width_new, m_height_new;
00086 
00087         //Define first set of filter parameters
00088         static const int m_filter_size = 5;
00089         static const int m_filter_shift = 8;
00090 
00091         static const int m_tap0 = 167;
00092         static const int m_tap1 = -56; 
00093         static const int m_tap2 = 25;
00094         static const int m_tap3 = -11; 
00095         static const int m_tap4 = 3;
00096 
00097         const int m_min_val;
00098         const int m_max_val;
00099 
00100         const int m_orig_xl;
00101         const int m_orig_yl;
00102     };
00103 
00104 } // namespace dirac
00105 
00106 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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