Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: wavelet_utils.h,v 1.15 2005/02/15 11:15:33 asuraparaju Exp $ $Name: Dirac_0_5_1 $ 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 _WAVELET_UTILS_H_ 00039 #define _WAVELET_UTILS_H_ 00040 00041 #include <libdirac_common/arrays.h> 00042 #include <libdirac_common/common.h> 00043 #include <vector> 00044 #include <cmath> 00045 #include <iostream> 00046 00047 //utilities for subband and wavelet transforms 00048 //Includes fast transform using lifting 00049 00050 namespace dirac 00051 { 00052 00053 class PicArray; 00054 class Subband; 00055 00057 class CodeBlock 00058 { 00059 00060 friend class Subband; 00061 00062 public: 00064 /* 00065 Default constructor - sets all dimensions to zero 00066 */ 00067 CodeBlock(); 00068 00070 /* 00071 Initialise the code block 00072 \param xstart the x-coord of the first coefficient in the block 00073 \param xend one past the last coefficient, horizontally 00074 \param ystart the y-coord of the first coefficient in the block 00075 \param yend one past the last coefficient, vertically 00076 */ 00077 CodeBlock( const int xstart , const int ystart , const int xend , const int yend); 00078 00080 int Xstart() const { return m_xstart; } 00081 00083 int Ystart() const { return m_ystart; } 00084 00086 int Xend() const { return m_xend; } 00087 00089 int Yend() const { return m_yend; } 00090 00092 int Xl() const { return m_xl; } 00093 00095 int Yl() const { return m_yl; } 00096 00098 int QIndex() const{ return m_qindex; } 00099 00101 float Wt() const { return m_wt; } 00102 00104 bool Skipped() const { return m_skipped; } 00105 00107 void SetQIndex( const int qindex ){ m_qindex = qindex; } 00108 00110 void SetSkip( bool skip ){ m_skipped = skip; } 00111 00112 private: 00113 00115 /* 00116 Initialise the code block 00117 \param xstart the x-coord of the first coefficient in the block 00118 \param xend one past the last coefficient, horizontally 00119 \param ystart the y-coord of the first coefficient in the block 00120 \param yend one past the last coefficient, vertically 00121 */ 00122 void Init( const int xstart , const int ystart , const int xend , const int yend ); 00123 00125 void SetWt( const float w ){ m_wt = w; } 00126 00127 00128 private: 00129 00130 int m_xstart; 00131 int m_ystart; 00132 int m_xend; 00133 int m_yend; 00134 int m_xl; 00135 int m_yl; 00136 00137 int m_qindex; 00138 float m_wt; 00139 00140 bool m_skipped; 00141 }; 00142 00143 00145 class Subband 00146 { 00147 public: 00148 00150 Subband(); 00151 00153 00161 Subband(int xpos, int ypos, int xlen, int ylen); 00162 00164 00173 Subband(int xpos, int ypos, int xlen, int ylen, int d); 00174 00176 ~Subband(); 00177 00178 //Default (shallow) copy constructor and operator= used 00179 00181 int Xl() const {return m_xl;} 00182 00184 int Xp() const {return m_xp;} 00185 00187 int Yl() const {return m_yl;} 00188 00190 int Yp() const {return m_yp;} 00191 00193 int Max() const {return m_max_bit;} 00194 00196 double Wt() const {return m_wt;} 00197 00199 int Depth() const {return m_depth;} 00200 00202 int Scale() const {return ( 1<<m_depth );} 00203 00205 int QIndex() const {return m_qindex;} 00206 00208 bool UsingMultiQuants() const {return m_multi_quants; } 00209 00211 int Parent() const {return m_parent;} 00212 00214 const std::vector<int>& Children() const {return m_children;} 00215 00217 int Child(const int n) const {return m_children[n];} 00218 00220 TwoDArray<CodeBlock>& GetCodeBlocks(){ return m_code_block_array; } 00221 00223 const TwoDArray<CodeBlock>& GetCodeBlocks() const { return m_code_block_array; } 00224 00226 bool Skipped() const { return m_skipped; } 00227 00229 void SetWt( const float w ); 00230 00232 void SetParent( const int p ){ m_parent=p; } 00233 00235 void SetDepth( const int d ){ m_depth=d;} 00236 00238 void SetMax( const int m ){ m_max_bit=m; }; 00239 00241 void SetChildren( const std::vector<int>& clist ){ m_children = clist; } 00242 00244 void AddChild( const int c ){ m_children.push_back(c); } 00245 00247 void SetNumBlocks( const int ynum , const int xnum ); 00248 00250 void SetQIndex( const int idx){ m_qindex = idx; } 00251 00253 void SetUsingMultiQuants( const bool multi){ m_multi_quants = multi; } 00254 00256 void SetSkip(const bool skip ){ m_skipped = skip; } 00257 00258 private: 00259 // subband bounds 00260 int m_xp , m_yp , m_xl , m_yl; 00261 00262 // perceptual weight for quantisation 00263 double m_wt; 00264 00265 // depth in the transform 00266 int m_depth; 00267 00268 // quantiser index 00269 int m_qindex; 00270 00271 // position of parent in a subband list 00272 int m_parent; 00273 00274 // positions of children in the subband list 00275 std::vector<int> m_children; 00276 00277 // position of the MSB of the largest absolute value 00278 int m_max_bit; 00279 00280 // The code blocks 00281 TwoDArray<CodeBlock> m_code_block_array; 00282 00283 // A flag indicating whether we're using one qf for each code block 00284 bool m_multi_quants; 00285 00286 // Whether the subband is skipped or not 00287 bool m_skipped; 00288 }; 00289 00291 class SubbandList 00292 { 00293 public: 00295 SubbandList(){} 00296 00298 ~SubbandList(){} 00299 00300 //Default (shallow) copy constructor and operator= used 00302 void Init(const int depth,const int xlen,const int ylen); 00303 00305 int Length() const {return bands.size();} 00306 00308 Subband& operator()(const int n){return bands[n-1];} 00309 00311 const Subband& operator()(const int n) const {return bands[n-1];} 00312 00314 void AddBand(const Subband& b){bands.push_back(b);} 00315 00317 void Clear(){bands.clear();} 00318 00320 00330 void SetBandWeights (const float cpd, 00331 const FrameSort& fsort, 00332 const ChromaFormat& cformat, 00333 const CompSort csort); 00334 00335 private: 00336 00338 float PerceptualWeight( const float xf , const float yf , const CompSort cs); 00339 00340 private: 00341 std::vector<Subband> bands; 00342 }; 00343 00344 00346 template <int gain> class PredictStep 00347 { 00348 00349 public: 00350 00352 PredictStep(){} 00353 00354 // Assume default copy constructor, assignment= and destructor // 00355 00357 /* 00358 Do the filtering. 00359 \param in_val the value being predicted 00360 \param val1 the first value being used for prediction 00361 \param val2 the second value being used for prediction 00362 */ 00363 void Filter(ValueType& in_val, const ValueType& val1, const ValueType& val2) const; 00364 00365 private: 00366 00367 }; 00368 00369 template <int gain> 00370 inline void PredictStep<gain>::Filter( ValueType& in_val, 00371 const ValueType& val1, 00372 const ValueType& val2) const 00373 { 00374 in_val -= static_cast< ValueType >( (gain * static_cast< int >( val1 + val2 )) >>12 ); 00375 } 00376 00378 template <int gain> class UpdateStep 00379 { 00380 00381 public: 00383 UpdateStep(){} 00384 00386 /* 00387 Do the filtering. 00388 \param in_val the value being updated 00389 \param val1 the first value being used for updating 00390 \param val2 the second value being used for updating 00391 */ 00392 void Filter(ValueType& in_val, const ValueType& val1, const ValueType& val2) const; 00393 00394 private: 00395 00396 }; 00397 00398 template <int gain> 00399 inline void UpdateStep<gain>::Filter(ValueType& in_val, 00400 const ValueType& val1, 00401 const ValueType& val2) const 00402 { 00403 in_val += static_cast< ValueType >( (gain * static_cast< int >( val1 + val2 )) >>12 ); 00404 } 00405 00407 00411 class WaveletTransform 00412 { 00413 public: 00415 WaveletTransform(int d = 4, WltFilter f = DAUB); 00416 00418 virtual ~WaveletTransform(); 00419 00421 00426 void Transform(const Direction d, PicArray& pic_data); 00427 00429 SubbandList& BandList(){return band_list;} 00430 00432 const SubbandList& BandList() const {return band_list;} 00433 00435 00445 void SetBandWeights (const float cpd, 00446 const FrameSort& fsort, 00447 const ChromaFormat& cformat, 00448 const CompSort csort); 00449 00450 private: 00451 //other private variables 00452 00453 SubbandList band_list; 00454 00456 int depth; 00457 00459 WltFilter filt_sort; 00460 00461 private: 00462 //functions 00464 WaveletTransform(const WaveletTransform& cpy); 00465 00467 WaveletTransform& operator=(const WaveletTransform& rhs); 00468 00470 float PerceptualWeight(float xf,float yf,CompSort cs); 00471 00473 void VHSplit(const int xp, const int yp, const int xl, const int yl, PicArray&pic_data); 00474 00476 void VHSynth(const int xp, const int yp, const int xl, const int yl, PicArray& pic_data); 00477 00478 }; 00479 00480 }// end namespace dirac 00481 00482 #endif
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