Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: wavelet_utils.h,v 1.32 2008/10/20 04:21:02 asuraparaju Exp $ $Name: Dirac_1_0_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), 00024 * Scott R Ladd 00025 * Anuradha Suraparaju 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 _WAVELET_UTILS_H_ 00041 #define _WAVELET_UTILS_H_ 00042 00043 #include <libdirac_common/arrays.h> 00044 #include <libdirac_common/common.h> 00045 #include <vector> 00046 #include <cmath> 00047 #include <iostream> 00048 00049 //utilities for subband and wavelet transforms 00050 //Includes fast transform using lifting 00051 00052 namespace dirac 00053 { 00054 00055 class PicArray; 00056 class Subband; 00057 00059 class CodeBlock 00060 { 00061 00062 friend class Subband; 00063 00064 public: 00066 /* 00067 Default constructor - sets all dimensions to zero 00068 */ 00069 CodeBlock(); 00070 00072 /* 00073 Initialise the code block 00074 \param xstart the x-coord of the first coefficient in the block 00075 \param xend one past the last coefficient, horizontally 00076 \param ystart the y-coord of the first coefficient in the block 00077 \param yend one past the last coefficient, vertically 00078 */ 00079 CodeBlock( const int xstart , const int ystart , const int xend , const int yend); 00080 00082 int Xstart() const { return m_xstart; } 00083 00085 int Ystart() const { return m_ystart; } 00086 00088 int Xend() const { return m_xend; } 00089 00091 int Yend() const { return m_yend; } 00092 00094 int Xl() const { return m_xl; } 00095 00097 int Yl() const { return m_yl; } 00098 00100 int QuantIndex() const{ return m_quantindex; } 00101 00103 bool Skipped() const { return m_skipped; } 00104 00106 void SetQuantIndex( const int quantindex ){ m_quantindex = quantindex; } 00107 00109 void SetSkip( bool skip ){ m_skipped = skip; } 00110 00111 private: 00112 00114 /* 00115 Initialise the code block 00116 \param xstart the x-coord of the first coefficient in the block 00117 \param xend one past the last coefficient, horizontally 00118 \param ystart the y-coord of the first coefficient in the block 00119 \param yend one past the last coefficient, vertically 00120 */ 00121 void Init( const int xstart , const int ystart , const int xend , const int yend ); 00122 00123 private: 00124 00125 int m_xstart; 00126 int m_ystart; 00127 int m_xend; 00128 int m_yend; 00129 int m_xl; 00130 int m_yl; 00131 00132 int m_quantindex; 00133 00134 bool m_skipped; 00135 }; 00136 00137 00139 class Subband 00140 { 00141 public: 00142 00144 Subband(); 00145 00147 00155 Subband(int xpos, int ypos, int xlen, int ylen); 00156 00158 00167 Subband(int xpos, int ypos, int xlen, int ylen, int d); 00168 00170 ~Subband(); 00171 00172 //Default (shallow) copy constructor and operator= used 00173 00175 int Xl() const {return m_xl;} 00176 00178 int Xp() const {return m_xp;} 00179 00181 int Yl() const {return m_yl;} 00182 00184 int Yp() const {return m_yp;} 00185 00187 int Max() const {return m_max_bit;} 00188 00190 double Wt() const {return m_wt;} 00191 00193 int Depth() const {return m_depth;} 00194 00196 int Scale() const {return ( 1<<m_depth );} 00197 00199 int QuantIndex() const {return m_qindex;} 00200 00202 bool UsingMultiQuants() const {return m_multi_quants; } 00203 00205 int Parent() const {return m_parent;} 00206 00208 const std::vector<int>& Children() const {return m_children;} 00209 00211 int Child(const int n) const {return m_children[n];} 00212 00214 TwoDArray<CodeBlock>& GetCodeBlocks(){ return m_code_block_array; } 00215 00217 const TwoDArray<CodeBlock>& GetCodeBlocks() const { return m_code_block_array; } 00218 00220 bool Skipped() const { return m_skipped; } 00221 00223 void SetWt( const float w ); 00224 00226 void SetParent( const int p ){ m_parent=p; } 00227 00229 void SetDepth( const int d ){ m_depth=d;} 00230 00232 void SetMax( const int m ){ m_max_bit=m; }; 00233 00235 void SetNumBlocks( const int ynum , const int xnum ); 00236 00238 void SetQuantIndex( const int idx){ m_qindex = idx; } 00239 00241 void SetUsingMultiQuants( const bool multi){ m_multi_quants = multi; } 00242 00244 void SetSkip(const bool skip ){ m_skipped = skip; } 00245 00246 private: 00247 // subband bounds 00248 int m_xp , m_yp , m_xl , m_yl; 00249 00250 // perceptual weight for quantisation 00251 double m_wt; 00252 00253 // depth in the transform 00254 int m_depth; 00255 00256 // quantiser index 00257 int m_qindex; 00258 00259 // position of parent in a subband list 00260 int m_parent; 00261 00262 // positions of children in the subband list 00263 std::vector<int> m_children; 00264 00265 // position of the MSB of the largest absolute value 00266 int m_max_bit; 00267 00268 // The code blocks 00269 TwoDArray<CodeBlock> m_code_block_array; 00270 00271 // A flag indicating whether we're using one qf for each code block 00272 bool m_multi_quants; 00273 00274 // Whether the subband is skipped or not 00275 bool m_skipped; 00276 }; 00277 00279 class SubbandList 00280 { 00281 public: 00283 SubbandList(){} 00284 00286 ~SubbandList(){} 00287 00288 //Default (shallow) copy constructor and operator= used 00290 void Init(const int depth,const int xlen,const int ylen); 00291 00293 int Length() const {return bands.size();} 00294 00296 Subband& operator()(const int n){return bands[n-1];} 00297 00299 const Subband& operator()(const int n) const {return bands[n-1];} 00300 00302 void AddBand(const Subband& b){bands.push_back(b);} 00303 00305 void Clear(){bands.clear();} 00306 00307 private: 00308 00310 float PerceptualWeight( const float xf , const float yf , const CompSort cs); 00311 00312 private: 00313 std::vector<Subband> bands; 00314 }; 00315 00316 class CoeffArray; 00318 class VHFilter 00319 { 00320 00321 public: 00322 00323 VHFilter(){} 00324 00325 virtual ~VHFilter(){} 00326 00328 virtual void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data)=0; 00329 00331 virtual void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data)=0; 00332 00334 virtual int GetShift() const =0; 00335 00336 protected: 00337 00339 inline void Interleave( const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data ); 00340 00341 00343 inline void DeInterleave( const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data ); 00344 00346 void ShiftRowLeft(CoeffType *row, int length, int shift); 00347 00349 void ShiftRowRight(CoeffType *row, int length, int shift); 00350 }; 00351 00353 class VHFilterDAUB9_7 : public VHFilter 00354 { 00355 00356 public: 00357 00359 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00360 00362 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00363 00365 int GetShift() const {return 1;} 00366 00367 00368 }; 00369 00371 class VHFilterLEGALL5_3 : public VHFilter 00372 { 00373 00374 public: 00375 00377 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00378 00380 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00381 00383 int GetShift() const {return 1;} 00384 00385 00386 #ifdef HAVE_MMX 00387 inline void HorizSynth (int xp, int xl, int ystart, int yend, CoeffArray &coeff_data); 00388 #endif 00389 00390 }; 00391 00393 class VHFilterDD9_7 : public VHFilter 00394 { 00395 00396 public: 00397 00399 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00400 00402 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00403 00405 int GetShift() const {return 1;} 00406 }; 00407 00408 00410 class VHFilterDD13_7 : public VHFilter 00411 { 00412 00413 public: 00414 00416 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00417 00419 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00420 00422 int GetShift() const {return 1;} 00423 00424 }; 00425 00427 class VHFilterHAAR0 : public VHFilter 00428 { 00429 00430 public: 00431 00433 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00434 00436 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00437 00439 int GetShift() const {return 0;} 00440 00441 00442 }; 00443 00445 class VHFilterHAAR1 : public VHFilter 00446 { 00447 00448 public: 00449 00451 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00452 00454 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00455 00457 int GetShift() const {return 1;} 00458 00459 }; 00460 00461 00463 class VHFilterHAAR2 : public VHFilter 00464 { 00465 00466 public: 00467 00469 void Split(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00470 00472 void Synth(const int xp, const int yp, const int xl, const int yl, CoeffArray& coeff_data); 00473 00475 double GetLowFactor() const { return 1.414213562;} 00476 00478 double GetHighFactor() const { return 0.707106781;} 00479 00481 int GetShift() const {return 2;} 00482 00483 }; 00484 00485 00486 00487 // Lifting steps used in the filters 00488 00490 template<int shift> 00491 class PredictStepShift 00492 { 00493 00494 public: 00495 00497 PredictStepShift(){} 00498 00499 // Assume default copy constructor, assignment= and destructor // 00500 00502 /* 00503 Do the filtering. 00504 \param in_val the value being predicted 00505 \param val1 the first value being used for prediction 00506 \param val2 the second value being used for prediction 00507 */ 00508 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2) const 00509 { 00510 in_val -= (( val1 + val2 + (1<<(shift-1)) ) >>shift ); 00511 } 00512 00513 }; 00514 00516 template<int shift> 00517 class UpdateStepShift 00518 { 00519 00520 public: 00522 UpdateStepShift(){} 00523 00525 /* 00526 Do the filtering. 00527 \param in_val the value being updated 00528 \param val1 the first value being used for updating 00529 \param val2 the second value being used for updating 00530 */ 00531 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2) const 00532 { 00533 in_val += ( ( val1 + val2 + (1<<(shift-1)) ) >>shift ); 00534 } 00535 00536 }; 00537 00539 template <int shift , int tap1, int tap2> 00540 class PredictStepFourTap 00541 { 00542 public: 00543 00545 PredictStepFourTap(){} 00546 00547 // Assume default copy constructor, assignment= and destructor // 00548 00550 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2 , 00551 const CoeffType& val3, const CoeffType& val4 ) const 00552 { 00553 in_val -= ( tap1*( val1 + val2 ) + tap2*( val3 + val4 ) + (1<<(shift-1)))>>shift; 00554 } 00555 }; 00556 00558 template <int shift , int tap1 , int tap2> 00559 class UpdateStepFourTap 00560 { 00561 00562 public: 00564 UpdateStepFourTap(){} 00565 00567 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2 , 00568 const CoeffType& val3, const CoeffType& val4 ) const 00569 { 00570 in_val += ( tap1*( val1 + val2 ) + tap2*( val3 + val4 ) + (1<<(shift-1)) )>>shift; 00571 } 00572 }; 00573 00575 template <int gain> class PredictStep97 00576 { 00577 public: 00578 00580 PredictStep97(){} 00581 00582 // Assume default copy constructor, assignment= and destructor // 00583 00585 /* 00586 Do the filtering. 00587 \param in_val the value being predicted 00588 \param val1 the first value being used for prediction 00589 \param val2 the second value being used for prediction 00590 */ 00591 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2) const 00592 { 00593 in_val -= static_cast< CoeffType >( (gain * static_cast< int >( val1 + val2 )) >>12 ); 00594 } 00595 }; 00596 00598 template <int gain> class UpdateStep97 00599 { 00600 00601 public: 00603 UpdateStep97(){} 00604 00606 /* 00607 Do the filtering. 00608 \param in_val the value being updated 00609 \param val1 the first value being used for updating 00610 \param val2 the second value being used for updating 00611 */ 00612 inline void Filter(CoeffType& in_val, const CoeffType& val1, const CoeffType& val2) const 00613 { 00614 in_val += static_cast< CoeffType >( (gain * static_cast< int >( val1 + val2 )) >>12 ); 00615 } 00616 }; 00617 00619 00622 class CoeffArray: public TwoDArray<CoeffType> 00623 { 00624 public: 00626 00629 CoeffArray(): TwoDArray<CoeffType>(){} 00630 00632 00636 CoeffArray(int height, int width, CompSort cs=Y_COMP): 00637 TwoDArray<CoeffType>(height, width), m_csort(cs){} 00638 00639 //copy constructor and assignment= derived by inheritance 00640 00642 ~CoeffArray(){} 00643 00645 const CompSort& CSort() const {return m_csort;} 00646 00648 void SetCSort(const CompSort cs){ m_csort = cs; } 00649 00651 SubbandList& BandList(){return m_band_list;} 00652 00654 const SubbandList& BandList() const {return m_band_list;} 00655 00657 00662 void SetBandWeights (const EncoderParams& encparams, 00663 const PictureParams& pparams, 00664 const CompSort csort, 00665 const float cpd_scale_factor); 00666 00667 private: 00668 00669 CompSort m_csort; 00670 00671 // The subband list to be used for conventional transform apps 00672 SubbandList m_band_list; 00673 00674 private: 00675 00677 float PerceptualWeight(float xf,float yf,CompSort cs); 00678 00679 }; 00680 00682 00686 class WaveletTransform 00687 { 00688 public: 00690 WaveletTransform(int d = 4, WltFilter f = DAUB9_7); 00691 00693 virtual ~WaveletTransform(); 00694 00696 00702 void Transform(const Direction d, PicArray& pic_data, CoeffArray& coeff_data); 00703 00704 private: 00705 00706 00707 private: 00708 00709 // Private variables 00710 00712 int m_depth; 00713 00715 WltFilter m_filt_sort; 00716 00718 VHFilter* m_vhfilter; 00719 00720 private: 00721 // Private functions 00723 WaveletTransform(const WaveletTransform& cpy); 00724 00726 WaveletTransform& operator=(const WaveletTransform& rhs); 00727 00728 }; 00729 }// end namespace dirac 00730 00731 #endif
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