Created by the British Broadcasting Corporation.
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.
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