Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_codec.h,v 1.15 2005/12/02 10:16:52 asuraparaju Exp $ $Name: Dirac_0_5_4 $ 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 * 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 #ifndef _BAND_CODEC_H_ 00041 #define _BAND_CODEC_H_ 00042 00043 #include <libdirac_common/arith_codec.h> 00044 #include <libdirac_common/wavelet_utils.h> 00045 00046 namespace dirac 00047 { 00048 00049 //Subclasses the arithmetic codec to produce a coding/decoding tool for subbands 00050 00051 00053 00056 class BandCodec: public ArithCodec<PicArray > 00057 { 00058 public: 00059 00061 00068 BandCodec(BasicOutputManager* bits_out, 00069 size_t number_of_contexts, 00070 const SubbandList& band_list, 00071 int band_num); 00072 00074 00081 BandCodec(BitInputManager* bits_in, 00082 size_t number_of_contexts, 00083 const SubbandList& band_list, 00084 int band_num); 00085 00087 void InitContexts(); 00088 00089 protected: 00091 void CodeVal( PicArray& in_data , const int xpos , const int ypos , const ValueType val); 00092 00094 void DecodeVal(PicArray& out_data , const int xpos , const int ypos ); 00095 00097 inline void SetToVal( const CodeBlock& code_block , PicArray& pic_data , const ValueType val); 00098 00100 inline void ClearBlock( const CodeBlock& code_block , PicArray& pic_data); 00101 00102 private: 00103 //functions 00104 // Overridden from the base class 00105 virtual void DoWorkCode(PicArray& in_data); 00106 // Ditto 00107 virtual void DoWorkDecode(PicArray& out_data); 00108 00109 virtual void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00110 virtual void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00111 00112 void ResetAll(); 00113 00114 // structure used to select the contexts used to encode / decode a symbol 00115 typedef struct 00116 { 00117 int firstContext; 00118 int secondContext; 00119 int endContext; 00120 } ContextTriple; 00121 00122 typedef enum ContextTripleAliases 00123 { 00124 Z_z_CTXT, 00125 Z_nz_CTXT, 00126 NZ_z_CTXT, 00127 NZ_b_CTXT, 00128 NZ_a_CTXT, 00129 lastCTXTAlias 00130 } ; 00131 00132 static const ContextTriple m_context_triples[lastCTXTAlias]; 00133 00134 const ContextTriple& ChooseContexts() const; 00135 00136 int ChooseSignContext(const PicArray& data , const int xpos , const int ypos ) const; 00137 00139 BandCodec(const BandCodec& cpy); 00141 BandCodec& operator=(const BandCodec& rhs); 00142 00143 protected: 00145 int m_bnum; 00146 00148 const Subband m_node; 00149 00151 int m_vol; 00152 00154 int m_reset_coeff_num; 00155 00157 int m_coeff_count; 00158 00160 int m_qf, m_qfinv; 00161 00163 ValueType m_offset; 00164 00166 ValueType m_nhood_sum; 00167 00169 Subband m_pnode; 00170 00172 int m_pxp, m_pyp, m_pxl, m_pyl; 00173 00175 int m_pxpos, m_pypos; 00176 00178 bool m_parent_notzero; 00179 00181 ValueType m_cut_off_point; 00182 }; 00183 00185 00189 class LFBandCodec: public BandCodec 00190 { 00191 public: 00193 00200 LFBandCodec(BasicOutputManager* bits_out, 00201 size_t number_of_contexts, 00202 const SubbandList& band_list, 00203 int band_num) 00204 : BandCodec(bits_out,number_of_contexts,band_list,band_num){} 00205 00207 00214 LFBandCodec(BitInputManager* bits_in, 00215 size_t number_of_contexts, 00216 const SubbandList& band_list, 00217 int band_num) 00218 : BandCodec(bits_in,number_of_contexts,band_list,band_num){} 00219 00220 private: 00221 // Overridden from the base class 00222 void DoWorkCode(PicArray& in_data); 00223 // Ditto 00224 void DoWorkDecode(PicArray& out_data); 00225 00226 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00227 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00228 00230 LFBandCodec(const LFBandCodec& cpy); 00232 LFBandCodec& operator=(const LFBandCodec& rhs); 00233 00234 }; 00235 00236 00238 //Finally,special class incorporating prediction for the DC band of intra frames// 00240 00242 00246 class IntraDCBandCodec: public BandCodec 00247 { 00248 public: 00250 00256 IntraDCBandCodec(BasicOutputManager* bits_out, 00257 size_t number_of_contexts, 00258 const SubbandList& band_list) 00259 : BandCodec(bits_out,number_of_contexts,band_list,band_list.Length()){} 00260 00262 00268 IntraDCBandCodec(BitInputManager* bits_in, 00269 size_t number_of_contexts, 00270 const SubbandList& band_list) 00271 : BandCodec(bits_in,number_of_contexts,band_list,band_list.Length()){} 00272 00273 private: 00274 void DoWorkCode(PicArray& in_data); //overridden from the base class 00275 void DoWorkDecode(PicArray& out_data); //ditto 00276 00277 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00278 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00279 00281 IntraDCBandCodec(const IntraDCBandCodec& cpy); 00282 00284 IntraDCBandCodec& operator=(const IntraDCBandCodec& rhs); 00285 00287 ValueType GetPrediction(const PicArray& data , const int xpos , const int ypos ) const; 00288 00289 private: 00290 PicArray m_dc_pred_res; 00291 }; 00292 00293 00294 }// end namespace dirac 00295 #endif
© 2004 British Broadcasting Corporation.
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