Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_codec.h,v 1.13 2005/04/06 14:31:10 tjdwave Exp $ $Name: Dirac_0_5_2 $ 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), Scott R Ladd 00024 * 00025 * Alternatively, the contents of this file may be used under the terms of 00026 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser 00027 * Public License Version 2.1 (the "LGPL"), in which case the provisions of 00028 * the GPL or the LGPL are applicable instead of those above. If you wish to 00029 * allow use of your version of this file only under the terms of the either 00030 * the GPL or LGPL and not to allow others to use your version of this file 00031 * under the MPL, indicate your decision by deleting the provisions above 00032 * and replace them with the notice and other provisions required by the GPL 00033 * or LGPL. If you do not delete the provisions above, a recipient may use 00034 * your version of this file under the terms of any one of the MPL, the GPL 00035 * or the LGPL. 00036 * ***** END LICENSE BLOCK ***** */ 00037 00038 #ifndef _BAND_CODEC_H_ 00039 #define _BAND_CODEC_H_ 00040 00041 #include <libdirac_common/arith_codec.h> 00042 #include <libdirac_common/wavelet_utils.h> 00043 00044 namespace dirac 00045 { 00046 00047 //Subclasses the arithmetic codec to produce a coding/decoding tool for subbands 00048 00049 00051 00054 class BandCodec: public ArithCodec<PicArray > 00055 { 00056 public: 00057 00059 00066 BandCodec(BasicOutputManager* bits_out, 00067 size_t number_of_contexts, 00068 const SubbandList& band_list, 00069 int band_num); 00070 00072 00079 BandCodec(BitInputManager* bits_in, 00080 size_t number_of_contexts, 00081 const SubbandList& band_list, 00082 int band_num); 00083 00085 void InitContexts(); 00086 00087 protected: 00089 void CodeVal( PicArray& in_data , const int xpos , const int ypos , const ValueType val); 00090 00092 void DecodeVal(PicArray& out_data , const int xpos , const int ypos ); 00093 00095 void SetToVal( const CodeBlock& code_block , PicArray& pic_data , const ValueType val); 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 00107 void ResetAll(); 00108 00109 int ChooseContext( const int bin_number) const; 00110 int ChooseSignContext(const PicArray& data , const int xpos , const int ypos ) const; 00111 00113 BandCodec(const BandCodec& cpy); 00115 BandCodec& operator=(const BandCodec& rhs); 00116 00117 protected: 00119 int m_bnum; 00120 00122 const Subband m_node; 00123 00125 int m_vol; 00126 00128 int m_reset_coeff_num; 00129 00131 int m_coeff_count; 00132 00134 int m_qf, m_qfinv; 00135 00137 ValueType m_offset; 00138 00140 ValueType m_nhood_sum; 00141 00143 Subband m_pnode; 00144 00146 int m_pxp, m_pyp, m_pxl, m_pyl; 00147 00149 int m_pxpos, m_pypos; 00150 00152 bool m_parent_notzero; 00153 00155 ValueType m_cut_off_point; 00156 }; 00157 00159 00163 class LFBandCodec: public BandCodec 00164 { 00165 public: 00167 00174 LFBandCodec(BasicOutputManager* bits_out, 00175 size_t number_of_contexts, 00176 const SubbandList& band_list, 00177 int band_num) 00178 : BandCodec(bits_out,number_of_contexts,band_list,band_num){} 00179 00181 00188 LFBandCodec(BitInputManager* bits_in, 00189 size_t number_of_contexts, 00190 const SubbandList& band_list, 00191 int band_num) 00192 : BandCodec(bits_in,number_of_contexts,band_list,band_num){} 00193 00194 private: 00195 // Overridden from the base class 00196 void DoWorkCode(PicArray& in_data); 00197 // Ditto 00198 void DoWorkDecode(PicArray& out_data); 00199 00200 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00201 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00202 00204 LFBandCodec(const LFBandCodec& cpy); 00206 LFBandCodec& operator=(const LFBandCodec& rhs); 00207 00208 }; 00209 00210 00212 //Finally,special class incorporating prediction for the DC band of intra frames// 00214 00216 00220 class IntraDCBandCodec: public BandCodec 00221 { 00222 public: 00224 00230 IntraDCBandCodec(BasicOutputManager* bits_out, 00231 size_t number_of_contexts, 00232 const SubbandList& band_list) 00233 : BandCodec(bits_out,number_of_contexts,band_list,band_list.Length()){} 00234 00236 00242 IntraDCBandCodec(BitInputManager* bits_in, 00243 size_t number_of_contexts, 00244 const SubbandList& band_list) 00245 : BandCodec(bits_in,number_of_contexts,band_list,band_list.Length()){} 00246 00247 private: 00248 void DoWorkCode(PicArray& in_data); //overridden from the base class 00249 void DoWorkDecode(PicArray& out_data); //ditto 00250 00251 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00252 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00253 00255 IntraDCBandCodec(const IntraDCBandCodec& cpy); 00256 00258 IntraDCBandCodec& operator=(const IntraDCBandCodec& rhs); 00259 00261 ValueType GetPrediction(const PicArray& data , const int xpos , const int ypos ) const; 00262 00263 private: 00264 PicArray m_dc_pred_res; 00265 }; 00266 00267 00268 }// end namespace dirac 00269 #endif
© 2004 British Broadcasting Corporation.
Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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