Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_codec.h,v 1.26 2007/07/26 12:46:35 tjdwave Exp $ $Name: Dirac_0_9_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_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<CoeffArray> 00061 { 00062 public: 00063 00065 00073 BandCodec(SubbandByteIO* subband_byteio, 00074 size_t number_of_contexts, 00075 const SubbandList& band_list, 00076 int band_num, 00077 const bool is_intra); 00078 00079 protected: 00081 inline void CodeVal( CoeffArray& in_data , const int xpos , const int ypos , const CoeffType val); 00082 00084 inline void DecodeVal(CoeffArray& out_data , const int xpos , const int ypos ); 00085 00087 void CodeQIndexOffset( const int offset ); 00088 00090 int DecodeQIndexOffset(); 00091 00093 inline void SetToVal( const CodeBlock& code_block , CoeffArray& coeff_data , const CoeffType val); 00094 00096 inline void ClearBlock( const CodeBlock& code_block , CoeffArray& coeff_data); 00097 00098 private: 00099 //functions 00100 // Overridden from the base class 00101 virtual void DoWorkCode(CoeffArray& in_data); 00102 // Ditto 00103 virtual void DoWorkDecode(CoeffArray& out_data); 00104 00105 virtual void CodeCoeffBlock(const CodeBlock& code_block , CoeffArray& in_data); 00106 virtual void DecodeCoeffBlock(const CodeBlock& code_block , CoeffArray& out_data); 00107 00109 inline int ChooseFollowContext( const int bin_number ) const; 00110 00112 inline int ChooseInfoContext() const; 00113 00115 inline int ChooseSignContext(const CoeffArray& data , const int xpos , const int ypos ) const; 00116 00118 BandCodec(const BandCodec& cpy); 00120 BandCodec& operator=(const BandCodec& rhs); 00121 00122 protected: 00123 00125 bool m_is_intra; 00126 00128 int m_bnum; 00129 00131 const Subband m_node; 00132 00134 int m_last_qf_idx; 00135 00137 int m_qf; 00138 00140 CoeffType m_offset; 00141 00143 bool m_nhood_nonzero; 00144 00146 Subband m_pnode; 00147 00149 int m_pxp, m_pyp, m_pxl, m_pyl; 00150 00152 int m_pxpos, m_pypos; 00153 00155 bool m_parent_notzero; 00156 00157 }; 00158 00160 00164 class LFBandCodec: public BandCodec 00165 { 00166 public: 00168 00176 LFBandCodec(SubbandByteIO* subband_byteio, 00177 size_t number_of_contexts, 00178 const SubbandList& band_list, 00179 int band_num, 00180 const bool is_intra) 00181 : BandCodec(subband_byteio,number_of_contexts,band_list, 00182 band_num,is_intra){} 00183 00184 private: 00185 // Overridden from the base class 00186 void DoWorkCode(CoeffArray& in_data); 00187 // Ditto 00188 void DoWorkDecode(CoeffArray& out_data); 00189 00190 void CodeCoeffBlock(const CodeBlock& code_block , CoeffArray& in_data); 00191 void DecodeCoeffBlock(const CodeBlock& code_block , CoeffArray& out_data); 00192 00194 LFBandCodec(const LFBandCodec& cpy); 00196 LFBandCodec& operator=(const LFBandCodec& rhs); 00197 00198 }; 00199 00200 00202 //Finally,special class incorporating prediction for the DC band of intra frames// 00204 00206 00210 class IntraDCBandCodec: public BandCodec 00211 { 00212 public: 00214 00220 IntraDCBandCodec(SubbandByteIO* subband_byteio, 00221 size_t number_of_contexts, 00222 const SubbandList& band_list) 00223 : BandCodec(subband_byteio,number_of_contexts,band_list, 00224 band_list.Length(), true){} 00225 00226 00227 private: 00228 void DoWorkCode(CoeffArray& in_data); //overridden from the base class 00229 void DoWorkDecode(CoeffArray& out_data); //ditto 00230 00231 void CodeCoeffBlock(const CodeBlock& code_block , CoeffArray& in_data); 00232 void DecodeCoeffBlock(const CodeBlock& code_block , CoeffArray& out_data); 00233 00235 IntraDCBandCodec(const IntraDCBandCodec& cpy); 00236 00238 IntraDCBandCodec& operator=(const IntraDCBandCodec& rhs); 00239 00241 CoeffType GetPrediction(const CoeffArray& data , const int xpos , const int ypos ) const; 00242 00243 private: 00244 CoeffArray m_dc_pred_res; 00245 }; 00246 00247 00248 }// end namespace dirac 00249 #endif
© 2004 British Broadcasting Corporation.
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