Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_codec.h,v 1.22 2006/11/13 09:41:44 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 00079 void InitContexts(); 00080 00081 protected: 00083 inline void CodeVal( PicArray& in_data , const int xpos , const int ypos , const ValueType val); 00084 00086 inline void DecodeVal(PicArray& out_data , const int xpos , const int ypos ); 00087 00089 void CodeQIndexOffset( const int offset ); 00090 00092 int DecodeQIndexOffset(); 00093 00095 inline void SetToVal( const CodeBlock& code_block , PicArray& pic_data , const ValueType val); 00096 00098 inline void ClearBlock( const CodeBlock& code_block , PicArray& pic_data); 00099 00100 private: 00101 //functions 00102 // Overridden from the base class 00103 virtual void DoWorkCode(PicArray& in_data); 00104 // Ditto 00105 virtual void DoWorkDecode(PicArray& out_data); 00106 00107 virtual void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00108 virtual void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00109 00110 void ResetAll(); 00111 00113 inline int ChooseFollowContext( const int bin_number ) const; 00114 00116 inline int ChooseInfoContext() const; 00117 00119 inline int ChooseSignContext(const PicArray& data , const int xpos , const int ypos ) const; 00120 00122 BandCodec(const BandCodec& cpy); 00124 BandCodec& operator=(const BandCodec& rhs); 00125 00126 protected: 00127 00129 bool m_is_intra; 00130 00132 int m_bnum; 00133 00135 const Subband m_node; 00136 00138 int m_last_qf_idx; 00139 00141 const int m_vol; 00142 00144 const int m_reset_coeff_num; 00145 00147 int m_coeff_count; 00148 00150 int m_qf; 00151 00153 ValueType m_offset; 00154 00156 bool m_nhood_nonzero; 00157 00159 Subband m_pnode; 00160 00162 int m_pxp, m_pyp, m_pxl, m_pyl; 00163 00165 int m_pxpos, m_pypos; 00166 00168 bool m_parent_notzero; 00169 00170 }; 00171 00173 00177 class LFBandCodec: public BandCodec 00178 { 00179 public: 00181 00188 LFBandCodec(SubbandByteIO* subband_byteio, 00189 size_t number_of_contexts, 00190 const SubbandList& band_list, 00191 int band_num, 00192 const bool is_intra) 00193 : BandCodec(subband_byteio,number_of_contexts,band_list, 00194 band_num,is_intra){} 00195 00196 private: 00197 // Overridden from the base class 00198 void DoWorkCode(PicArray& in_data); 00199 // Ditto 00200 void DoWorkDecode(PicArray& out_data); 00201 00202 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00203 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00204 00206 LFBandCodec(const LFBandCodec& cpy); 00208 LFBandCodec& operator=(const LFBandCodec& rhs); 00209 00210 }; 00211 00212 00214 //Finally,special class incorporating prediction for the DC band of intra frames// 00216 00218 00222 class IntraDCBandCodec: public BandCodec 00223 { 00224 public: 00226 00232 IntraDCBandCodec(SubbandByteIO* subband_byteio, 00233 size_t number_of_contexts, 00234 const SubbandList& band_list) 00235 : BandCodec(subband_byteio,number_of_contexts,band_list, 00236 band_list.Length(), true){} 00237 00238 00239 private: 00240 void DoWorkCode(PicArray& in_data); //overridden from the base class 00241 void DoWorkDecode(PicArray& out_data); //ditto 00242 00243 void CodeCoeffBlock(const CodeBlock& code_block , PicArray& in_data); 00244 void DecodeCoeffBlock(const CodeBlock& code_block , PicArray& out_data); 00245 00247 IntraDCBandCodec(const IntraDCBandCodec& cpy); 00248 00250 IntraDCBandCodec& operator=(const IntraDCBandCodec& rhs); 00251 00253 ValueType GetPrediction(const PicArray& data , const int xpos , const int ypos ) const; 00254 00255 private: 00256 PicArray m_dc_pred_res; 00257 }; 00258 00259 00260 }// end namespace dirac 00261 #endif
© 2004 British Broadcasting Corporation.
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