Dirac Video Codec

# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# band_vlc.h

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    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: band_vlc.h,v 1.5 2008/08/20 12:03:28 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): Thomas Davies (Original Author),
    00024 *                 Scott R Ladd,
    00025 *                 Steve Bearcroft
    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 _BAND_VLC_H
    00042 #define _BAND_VLC_H
    00043
    00044 #include <libdirac_common/wavelet_utils.h>
    00045
    00046
    00047 namespace dirac
    00048 {
    00049
    00050    class SubbandByteIO;
    00051    class ByteIO;
    00052
    00053
    00055
    00058     class BandVLC
    00059     {
    00060     public:
    00061
    00063
    00070         BandVLC(SubbandByteIO* subband_byteio,
    00071                   const SubbandList& band_list,
    00072                   int band_num,
    00073                   const bool is_intra);
    00074
    00075
    00076         void Decompress (CoeffArray& out_data, int num_bytes);
    00077
    00078         int Compress (CoeffArray &in_data);
    00079
    00080         virtual ~BandVLC(){}
    00081
    00082     protected:
    00084         inline void CodeVal( CoeffArray& in_data , const int xpos , const int ypos , const CoeffType val);
    00085
    00087         inline void DecodeVal(CoeffArray& out_data , const int xpos , const int ypos );
    00088
    00090         void CodeQuantIndexOffset( const int offset );
    00091
    00093         int DecodeQuantIndexOffset();
    00094
    00096         inline void SetToVal( const CodeBlock& code_block , CoeffArray& coeff_data , const CoeffType val);
    00097
    00099         inline void ClearBlock( const CodeBlock& code_block , CoeffArray& coeff_data);
    00100     private:
    00101         //functions
    00102         // Overridden from the base class
    00103         virtual void DoWorkCode(CoeffArray& in_data);
    00104         // Ditto
    00105         virtual void DoWorkDecode(CoeffArray& out_data);
    00106
    00107         virtual void CodeCoeffBlock(const CodeBlock& code_block , CoeffArray& in_data);
    00108         virtual void DecodeCoeffBlock(const CodeBlock& code_block , CoeffArray& out_data);
    00109
    00111         BandVLC(const BandVLC& cpy);
    00113         BandVLC& operator=(const BandVLC& rhs);
    00114
    00115     protected:
    00116
    00118         bool m_is_intra;
    00119
    00121         int m_bnum;
    00122
    00124         const Subband m_node;
    00125
    00127         int m_last_qf_idx;
    00128
    00130         int m_qf;
    00131
    00133         CoeffType m_offset;
    00134
    00136         ByteIO *m_byteio;
    00137
    00138     };
    00139
    00141     //Finally,special class incorporating prediction for the DC band of intra frames//
    00143
    00145
    00149     class IntraDCBandVLC: public BandVLC
    00150     {
    00151     public:
    00153
    00158         IntraDCBandVLC(SubbandByteIO* subband_byteio,
    00159                          const SubbandList& band_list)
    00160           : BandVLC(subband_byteio,band_list,
    00161                       band_list.Length(), true){}
    00162
    00163
    00164     private:
    00165         void DoWorkCode(CoeffArray& in_data);                    //overridden from the base class
    00166         void DoWorkDecode(CoeffArray& out_data); //ditto
    00167
    00168         void CodeCoeffBlock(const CodeBlock& code_block , CoeffArray& in_data);
    00169         void DecodeCoeffBlock(const CodeBlock& code_block , CoeffArray& out_data);
    00170         void DCPrediction(const CodeBlock& code_block , CoeffArray& out_data);
    00171
    00173         IntraDCBandVLC (const IntraDCBandVLC& cpy);
    00174
    00176         IntraDCBandVLC& operator=(const IntraDCBandVLC& rhs);
    00177
    00179         CoeffType GetPrediction(const CoeffArray& data , const int xpos , const int ypos ) const;
    00180     };
    00181
    00182
    00183 }// end namespace dirac
    00184 #endif

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