# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# mv_codec.h

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    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: mv_codec.h,v 1.19 2006/06/13 09:07:25 timborer Exp $ $Name: Dirac_0_6_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): Thomas Davies (Original Author),
    00024 *                 Scott R Ladd,
    00025 *                 Tim Borer,
    00026 *                 Andrew Kennedy
    00027 *
    00028 * Alternatively, the contents of this file may be used under the terms of
    00029 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
    00030 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
    00031 * the GPL or the LGPL are applicable instead of those above. If you wish to
    00032 * allow use of your version of this file only under the terms of the either
    00033 * the GPL or LGPL and not to allow others to use your version of this file
    00034 * under the MPL, indicate your decision by deleting the provisions above
    00035 * and replace them with the notice and other provisions required by the GPL
    00036 * or LGPL. If you do not delete the provisions above, a recipient may use
    00037 * your version of this file under the terms of any one of the MPL, the GPL
    00038 * or the LGPL.
    00039 * ***** END LICENSE BLOCK ***** */
    00040
    00041 #ifndef _MV_CODEC_H_
    00042 #define _MV_CODEC_H_
    00043
    00045 //Class to do motion vector coding and decoding//
    00046 //------using adaptive arithmetic coding-------//
    00048
    00049 #include <libdirac_common/arith_codec.h>
    00050 #include <libdirac_common/common.h>
    00051 #include <libdirac_common/motion.h>
    00052 #include <libdirac_common/wavelet_utils.h>
    00053 #include <vector>
    00054
    00055 namespace dirac
    00056 {
    00057
    00059
    00062     class MvDataCodec: public ArithCodec<MvData>
    00063     {
    00064     public:
    00066
    00072         MvDataCodec(ByteIO* p_byteio,
    00073                     size_t number_of_contexts,
    00074                     const ChromaFormat & cf);
    00075
    00076
    00077
    00079         void InitContexts();
    00080
    00081     private:
    00082
    00083         int m_MB_count;
    00084        const int m_reset_num;
    00085
    00086         const ChromaFormat & m_cformat;
    00087
    00088         // Position of current block
    00089         int m_b_xp, m_b_yp;
    00090         // Position of current MB
    00091         int m_mb_xp, m_mb_yp;
    00092         // Position of top-left block of current MB
    00093         int m_mb_tlb_x, m_mb_tlb_y;
    00094
    00095     private:
    00096
    00097         // functions
    00099         MvDataCodec(const MvDataCodec& cpy);
    00101         MvDataCodec& operator=(const MvDataCodec& rhs);
    00102
    00103         // coding functions
    00104         // Code the MB splitting mode
    00105         void CodeMBSplit(const MvData& in_data);
    00106         // Code the MB common ref mode
    00107         void CodeMBCom(const MvData& in_data);
    00108         // Code the block prediction mode
    00109         void CodePredmode(const MvData& in_data);
    00110         // Code the first motion vector
    00111         void CodeMv1(const MvData& in_data);
    00112         // Code the second motion vector
    00113         void CodeMv2(const MvData& in_data);
    00114         // Code the dc value of intra blocks
    00115         void CodeDC(const MvData& in_data);
    00116
    00117         // decoding functions
    00118         // Decode the MB splitting mode
    00119         void DecodeMBSplit( MvData& out_data);
    00120         // Decode the MB common ref mode
    00121         void DecodeMBCom( MvData& out_data);
    00122         // Decode the block prediction mode
    00123         void DecodePredmode(MvData& out_data);
    00124         // Decode the first motion vector
    00125         void DecodeMv1( MvData& out_data);
    00126         // Decode the second motion vector
    00127         void DecodeMv2( MvData& out_data);
    00128         // Decode the dc value of intra blocks
    00129         void DecodeDC( MvData& out_data);
    00130
    00131         void DoWorkCode( MvData& in_data );
    00132         void DoWorkDecode(MvData& out_data);
    00133
    00134         // Context stuff
    00135         void ResetAll();
    00136
    00137         //prediction stuff
    00138         unsigned int MBSplitPrediction(const TwoDArray<int>& mbdata) const;
    00139
    00140         bool MBCBModePrediction(const TwoDArray<bool>& mbdata) const;
    00141
    00142         unsigned int BlockModePrediction(const TwoDArray<PredMode>& preddata,
    00143                                          const unsigned int num_refs) const;
    00144
    00145         MVector Mv1Prediction( const MvArray& mvarray,
    00146                                const TwoDArray<PredMode>& preddata) const;
    00147
    00148         MVector Mv2Prediction( const MvArray& mvarray,
    00149                                const TwoDArray<PredMode>& preddata) const;
    00150
    00151         ValueType DCPrediction( const TwoDArray<ValueType>& dcdata,
    00152                                 const TwoDArray<PredMode>& preddata) const;
    00153     };
    00154
    00155 }// end namepace dirac
    00156
    00157 #endif

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