Dirac Video Codec

# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# mot_comp.h

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    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: mot_comp.h,v 1.22 2008/08/27 00:17:11 asuraparaju Exp $ $Name: Dirac_1_0_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),
    00024 *                 Thomas Davies
    00025 *                 Anuradha Suraparaju
    00026 *
    00027 * Alternatively, the contents of this file may be used under the terms of
    00028 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
    00029 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
    00030 * the GPL or the LGPL are applicable instead of those above. If you wish to
    00031 * allow use of your version of this file only under the terms of the either
    00032 * the GPL or LGPL and not to allow others to use your version of this file
    00033 * under the MPL, indicate your decision by deleting the provisions above
    00034 * and replace them with the notice and other provisions required by the GPL
    00035 * or LGPL. If you do not delete the provisions above, a recipient may use
    00036 * your version of this file under the terms of any one of the MPL, the GPL
    00037 * or the LGPL.
    00038 * ***** END LICENSE BLOCK ***** */
    00039
    00040 //  Motion Compensation routines.
    00041 //  Supports different sizes of blocks as long as the parameters
    00042 //     describing them are 'legal'. Blocks overlap the edge of the image
    00043 //     being written to but blocks in the reference image are forced to
    00044 //     lie completely within the image bounds.
    00045
    00046 #ifndef _INCLUDED_MOT_COMP
    00047 #define _INCLUDED_MOT_COMP
    00048
    00049 #include <cstdlib>
    00050 #include <ctime>
    00051 #include <iostream>
    00052 #include <vector>
    00053 #include <libdirac_common/common.h>
    00054 #include <libdirac_common/upconvert.h>
    00055 #include <libdirac_common/motion.h>
    00056 #include <libdirac_common/picture_buffer.h>
    00057
    00058 namespace dirac
    00059 {
    00060     class PictureBuffer;
    00061     class Picture;
    00062
    00064
    00070     class MotionCompensator
    00071     {
    00072
    00073     public:
    00075
    00078         MotionCompensator( const PicturePredParams &ppp );
    00080         virtual ~MotionCompensator();
    00081
    00083
    00093         static void CompensatePicture ( const PicturePredParams &ppp,
    00094                                       const AddOrSub direction ,
    00095                                       const MvData& mv_data,
    00096                                       Picture* in_pic ,
    00097                       Picture* refptr[2]);
    00098
    00100
    00108         void CompensatePicture( const AddOrSub direction ,
    00109                               const MvData& mv_data,
    00110                               Picture* in_pic ,
    00111                               Picture* refsptr[2] );
    00112
    00113     private:
    00114         //private, body-less copy constructor: this class should not be copied
    00115         MotionCompensator( const MotionCompensator& cpy );
    00116         //private, body-less assignment=: this class should not be assigned
    00117         MotionCompensator& operator=( const MotionCompensator& rhs );
    00118
    00119         //functions
    00120
    00122         void CompensateComponent( Picture* pic ,
    00123                                   Picture* refsptr[2] ,
    00124                                   const MvData& mv_data , const CompSort cs);
    00125
    00128         void DCBlock( TwoDArray<ValueType> &block_data ,
    00129                       const ValueType dc);
    00130         void ReConfig();
    00131
    00132         // Calculates a weighting arrays blocks.
    00133         void CalculateWeights(int xbsep, int ybsep, TwoDArray<ValueType>* wt_array);
    00134
    00136
    00147         void CreateBlock(int xbsep, int ybsep, bool FullX, bool FullY, TwoDArray<ValueType>& WeightArray);
    00148
    00150         void FlipX(const TwoDArray<ValueType>& Original, TwoDArray<ValueType>& Flipped);
    00151
    00153         void FlipY(const TwoDArray<ValueType>& Original, TwoDArray<ValueType>& Flipped);
    00154
    00155         virtual void CompensateBlock( TwoDArray<ValueType>& pic_data ,
    00156                               const ImageCoords& pos ,
    00157                               const ImageCoords &orig_pic_size,
    00158                               PredMode block_mode,
    00159                               ValueType dc,
    00160                               const PicArray& ref1up_data ,
    00161                               const MVector& mv1 ,
    00162                               const PicArray& ref2up_data ,
    00163                               const MVector& mv2 ,
    00164                               const TwoDArray<ValueType>& Weights );
    00166         virtual void BlockPixelPred( TwoDArray<ValueType>& block_data ,
    00167                               const ImageCoords& pos,
    00168                               const ImageCoords &orig_pic_size,
    00169                               const PicArray& refup_data ,
    00170                               const MVector& mv) = 0;
    00171
    00172         // Adjust the block value based on reference weights
    00173         /*
    00174         * Adjust the block value based on reference weights of each
    00175         * reference picture.
    00176         * val1_block - Block predicted from a single reference picture
    00177         * val2_block - Block predicted from second reference picture
    00178         *              mode is REF1AND2
    00179         * block_mode  - Block prediction mode.
    00180         *
    00181         * On return, val1_block will contain the weight reference weight
    00182         * adjusted block values
    00183         */
    00184         void AdjustBlockByRefWeights (TwoDArray<ValueType>& val1_block,
    00185                                       TwoDArray<ValueType>& val2_block,
    00186                                       PredMode block_mode);
    00187
    00188         // Adjust the block value based spatial weighting matrix
    00189         /*
    00190         * Adjust the block value based on spatial weighting matrix
    00191         * val_block - Predicted block
    00192         * pos       - position of top lef corner of block in picture
    00193         * wt_array  - spatial weighting matrix
    00194         *
    00195         * On return, val_block will contain the spatial weight adjusted block
    00196         * values
    00197         */
    00198         void AdjustBlockBySpatialWeights (TwoDArray<ValueType>& val_block,
    00199                                           const ImageCoords &pos,
    00200                                           const TwoDArray<ValueType> &wt_array);
    00201     protected:
    00202         //variables
    00203
    00205         PicturePredParams m_predparams;
    00206
    00208         ChromaFormat m_cformat;
    00209         bool luma_or_chroma;    //true if we're doing luma, false if we're coding chroma
    00210
    00211         // A marker saying whether we're doing MC addition or subtraction
    00212         AddOrSub m_add_or_sub;
    00213
    00214         // Block information
    00215         OLBParams m_bparams;
    00216         // Arrays of  block weights
    00217         TwoDArray<ValueType>* m_block_weights;
    00218         // Arrays of super block weights
    00219         TwoDArray<ValueType>* m_macro_block_weights;
    00220         // Arrays of  sub super block weights
    00221         TwoDArray<ValueType>* m_sub_block_weights;
    00222     };
    00223
    00225     class MotionCompensator_Pixel : public MotionCompensator
    00226     {
    00227
    00228     public:
    00230
    00233         MotionCompensator_Pixel (const PicturePredParams &ppp);
    00234
    00235     private:
    00237         virtual void BlockPixelPred( TwoDArray<ValueType>& block_data ,
    00238                               const ImageCoords& pos,
    00239                               const ImageCoords &orig_pic_size,
    00240                               const PicArray& refup_data ,
    00241                               const MVector& mv);
    00242     };
    00243
    00245     class MotionCompensator_HalfPixel : public MotionCompensator
    00246     {
    00247     public:
    00249
    00252         MotionCompensator_HalfPixel (const PicturePredParams &ppp);
    00253     private:
    00255         virtual void BlockPixelPred( TwoDArray<ValueType>& block_data ,
    00256                               const ImageCoords& pos,
    00257                               const ImageCoords &orig_pic_size,
    00258                               const PicArray& refup_data ,
    00259                               const MVector& mv);
    00260     };
    00261
    00263     class MotionCompensator_QuarterPixel : public MotionCompensator
    00264     {
    00265     public:
    00267
    00270         MotionCompensator_QuarterPixel (const PicturePredParams &ppp);
    00271     private:
    00273         virtual void BlockPixelPred( TwoDArray<ValueType>& block_data ,
    00274                               const ImageCoords& pos,
    00275                               const ImageCoords &orig_pic_size,
    00276                               const PicArray& refup_data ,
    00277                               const MVector& mv);
    00278     };
    00279
    00281     class MotionCompensator_EighthPixel : public MotionCompensator
    00282     {
    00283     public:
    00285
    00288         MotionCompensator_EighthPixel (const PicturePredParams &ppp);
    00289     private:
    00291         virtual void BlockPixelPred( TwoDArray<ValueType>& block_data ,
    00292                               const ImageCoords& pos,
    00293                               const ImageCoords &orig_pic_size,
    00294                               const PicArray& refup_data ,
    00295                               const MVector& mv);
    00296     };
    00297
    00298
    00299 } // namespace dirac
    00300
    00301 #endif

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