Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_codec.h,v 1.24 2007/03/01 09:24:32 tjdwave Exp $ $Name: $ 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_CODEC_H_ 00042 #define _BAND_CODEC_H_ 00043 00044 #include <libdirac_common/arith_codec.h> 00045 #include <libdirac_common/wavelet_utils.h> 00046 00047 00048 namespace dirac 00049 { 00050 00051 class SubbandByteIO; 00052 00053 //Subclasses the arithmetic codec to produce a coding/decoding tool for subbands 00054 00055 00057 00060 class BandCodec: public ArithCodec<PicArray> 00061 { 00062 public: 00063 00065 00072 BandCodec(SubbandByteIO* subband_byteio, 00073 size_t number_of_contexts, 00074 const SubbandList& band_list, 00075 int band_num, 00076 const bool is_intra); 00077 00078 protected: 00080 inline void CodeVal( PicArray& in_data , const int xpos , const int ypos , const ValueType val); 00081 00083 inline void DecodeVal(PicArray& out_data , const int xpos , const int ypos ); 00084 00086 void CodeQIndexOffset( const int offset ); 00087 00089 int DecodeQIndexOffset(); 00090 00092 inline void SetToVal( const CodeBlock& code_block , PicArray& pic_data , const ValueType val); 00093 00095 inline void ClearBlock( const CodeBlock& code_block , PicArray& pic_data); 00096 00097 private: 00098 //functions 00099 // Overridden from the base class 00100 virtual void DoWorkCode(PicArray& in_data); 00101 // Ditto 00102 virtual void DoWorkDecode(PicArray& out_data); 00103 00104 virtual void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00105 virtual void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00106 00108 inline int ChooseFollowContext( const int bin_number ) const; 00109 00111 inline int ChooseInfoContext() const; 00112 00114 inline int ChooseSignContext(const PicArray& data , const int xpos , const int ypos ) const; 00115 00117 BandCodec(const BandCodec& cpy); 00119 BandCodec& operator=(const BandCodec& rhs); 00120 00121 protected: 00122 00124 bool m_is_intra; 00125 00127 int m_bnum; 00128 00130 const Subband m_node; 00131 00133 int m_last_qf_idx; 00134 00136 int m_qf; 00137 00139 ValueType m_offset; 00140 00142 bool m_nhood_nonzero; 00143 00145 Subband m_pnode; 00146 00148 int m_pxp, m_pyp, m_pxl, m_pyl; 00149 00151 int m_pxpos, m_pypos; 00152 00154 bool m_parent_notzero; 00155 00156 }; 00157 00159 00163 class LFBandCodec: public BandCodec 00164 { 00165 public: 00167 00174 LFBandCodec(SubbandByteIO* subband_byteio, 00175 size_t number_of_contexts, 00176 const SubbandList& band_list, 00177 int band_num, 00178 const bool is_intra) 00179 : BandCodec(subband_byteio,number_of_contexts,band_list, 00180 band_num,is_intra){} 00181 00182 private: 00183 // Overridden from the base class 00184 void DoWorkCode(PicArray& in_data); 00185 // Ditto 00186 void DoWorkDecode(PicArray& out_data); 00187 00188 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00189 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00190 00192 LFBandCodec(const LFBandCodec& cpy); 00194 LFBandCodec& operator=(const LFBandCodec& rhs); 00195 00196 }; 00197 00198 00200 //Finally,special class incorporating prediction for the DC band of intra frames// 00202 00204 00208 class IntraDCBandCodec: public BandCodec 00209 { 00210 public: 00212 00218 IntraDCBandCodec(SubbandByteIO* subband_byteio, 00219 size_t number_of_contexts, 00220 const SubbandList& band_list) 00221 : BandCodec(subband_byteio,number_of_contexts,band_list, 00222 band_list.Length(), true){} 00223 00224 00225 private: 00226 void DoWorkCode(PicArray& in_data); //overridden from the base class 00227 void DoWorkDecode(PicArray& out_data); //ditto 00228 00229 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00230 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00231 00233 IntraDCBandCodec(const IntraDCBandCodec& cpy); 00234 00236 IntraDCBandCodec& operator=(const IntraDCBandCodec& rhs); 00237 00239 ValueType GetPrediction(const PicArray& data , const int xpos , const int ypos ) const; 00240 00241 private: 00242 PicArray m_dc_pred_res; 00243 }; 00244 00245 00246 }// end namespace dirac 00247 #endif
© 2004 British Broadcasting Corporation.
Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
HTML documentation generated by Dimitri van Heesch's
excellent Doxygen tool.