CABACWriter.cpp 104 KB
Newer Older
1
2
3
4
5
/* The copyright in this software is being made available under the BSD
* License, included below. This software may be subject to other third party
* and contributor rights, including patent rights, and no such rights are
* granted under this license.
*
6
* Copyright (c) 2010-2019, ITU/ISO/IEC
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*  * Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
*  * Redistributions in binary form must reproduce the above copyright notice,
*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
*  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
*    be used to endorse or promote products derived from this software without
*    specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

/** \file     CABACWriter.cpp
 *  \brief    Writer for low level syntax
 */

#include "CommonLib/Contexts.h"
#include "CABACWriter.h"

#include "EncLib.h"

#include "CommonLib/UnitTools.h"
#include "CommonLib/dtrace_buffer.h"
#include "CommonLib/BinaryDecisionTree.h"

#include <map>
#include <algorithm>
#include <limits>


//! \ingroup EncoderLib
//! \{

void CABACWriter::initCtxModels( const Slice& slice )
{
  int       qp                = slice.getSliceQp();
  SliceType sliceType         = slice.getSliceType();
  SliceType encCABACTableIdx  = slice.getEncCABACTableIdx();
  if( !slice.isIntra() && (encCABACTableIdx==B_SLICE || encCABACTableIdx==P_SLICE) && slice.getPPS()->getCabacInitPresentFlag() )
  {
    sliceType = encCABACTableIdx;
  }
  m_BinEncoder.reset( qp, (int)sliceType );
}



template <class BinProbModel>
SliceType xGetCtxInitId( const Slice& slice, const BinEncIf& binEncoder, Ctx& ctxTest )
{
  const CtxStore<BinProbModel>& ctxStoreTest = static_cast<const CtxStore<BinProbModel>&>( ctxTest );
  const CtxStore<BinProbModel>& ctxStoreRef  = static_cast<const CtxStore<BinProbModel>&>( binEncoder.getCtx() );
  int qp = slice.getSliceQp();
  if( !slice.isIntra() )
  {
    SliceType aSliceTypeChoices[] = { B_SLICE, P_SLICE };
    uint64_t  bestCost            = std::numeric_limits<uint64_t>::max();
    SliceType bestSliceType       = aSliceTypeChoices[0];
    for (uint32_t idx=0; idx<2; idx++)
    {
      uint64_t  curCost           = 0;
      SliceType curSliceType      = aSliceTypeChoices[idx];
      ctxTest.init( qp, (int)curSliceType );
      for( int k = 0; k < Ctx::NumberOfContexts; k++ )
      {
        if( binEncoder.getNumBins(k) > 0 )
        {
          curCost += uint64_t( binEncoder.getNumBins(k) ) * ctxStoreRef[k].estFracExcessBits( ctxStoreTest[k] );
        }
      }
      if (curCost < bestCost)
      {
        bestSliceType = curSliceType;
        bestCost      = curCost;
      }
    }
    return bestSliceType;
  }
  else
  {
    return I_SLICE;
  }
}


SliceType CABACWriter::getCtxInitId( const Slice& slice )
{
  switch( m_TestCtx.getBPMType() )
  {
  case BPM_Std:   return  xGetCtxInitId<BinProbModel_Std>   ( slice, m_BinEncoder, m_TestCtx );
  default:        return  NUMBER_OF_SLICE_TYPES;
  }
}



unsigned estBits( BinEncIf& binEnc, const std::vector<bool>& bins, const Ctx& ctx, const int ctxId, const uint8_t winSize )
{
  binEnc.initCtxAndWinSize( ctxId, ctx, winSize );
  binEnc.start();
  const std::size_t numBins   = bins.size();
  unsigned          startBits = binEnc.getNumWrittenBits();
  for( std::size_t binId = 0; binId < numBins; binId++ )
  {
    unsigned  bin = ( bins[binId] ? 1 : 0 );
    binEnc.encodeBin( bin, ctxId );
  }
  unsigned endBits    = binEnc.getNumWrittenBits();
  unsigned codedBits  = endBits - startBits;
  return   codedBits;
}





//================================================================================
//  clause 7.3.8.1
//--------------------------------------------------------------------------------
//    void  end_of_slice()
//================================================================================

void CABACWriter::end_of_slice()
{
  m_BinEncoder.encodeBinTrm ( 1 );
  m_BinEncoder.finish       ();
}




//================================================================================
//  clause 7.3.8.2
//--------------------------------------------------------------------------------
//    bool  coding_tree_unit( cs, area, qp, ctuRsAddr, skipSao )
//================================================================================

void CABACWriter::coding_tree_unit( CodingStructure& cs, const UnitArea& area, int (&qps)[2], unsigned ctuRsAddr, bool skipSao /* = false */ )
{
  CUCtx cuCtx( qps[CH_L] );
  Partitioner *partitioner = PartitionerFactory::get( *cs.slice );

  partitioner->initCtu( area, CH_L, *cs.slice );

  if( !skipSao )
  {
    sao( *cs.slice, ctuRsAddr );
  }

  for( int compIdx = 0; compIdx < MAX_NUM_COMPONENT; compIdx++ )
  {
    codeAlfCtuEnableFlag( cs, ctuRsAddr, compIdx );
  }

176
  if ( CS::isDualITree(cs) && cs.pcv->chrFormat != CHROMA_400 && cs.pcv->maxCUWidth > 64 )
177
178
179
180
181
182
183
184
185
186
187
188
  {
    CUCtx chromaCuCtx(qps[CH_C]);
    Partitioner *chromaPartitioner = PartitionerFactory::get(*cs.slice);
    chromaPartitioner->initCtu(area, CH_C, *cs.slice);
    coding_tree(cs, *partitioner, cuCtx, chromaPartitioner, &chromaCuCtx);
    qps[CH_L] = cuCtx.qp;
    qps[CH_C] = chromaCuCtx.qp;

    delete chromaPartitioner;
  }
  else
  {
189
190
191
192
193
194
195
196
197
    coding_tree( cs, *partitioner, cuCtx );
    qps[CH_L] = cuCtx.qp;
    if( CS::isDualITree( cs ) && cs.pcv->chrFormat != CHROMA_400 )
    {
      CUCtx cuCtxChroma( qps[CH_C] );
      partitioner->initCtu( area, CH_C, *cs.slice );
      coding_tree( cs, *partitioner, cuCtxChroma );
      qps[CH_C] = cuCtxChroma.qp;
    }
198
  }
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217

  delete partitioner;
}





//================================================================================
//  clause 7.3.8.3
//--------------------------------------------------------------------------------
//    void  sao             ( slice, ctuRsAddr )
//    void  sao_block_pars  ( saoPars, bitDepths, sliceEnabled, leftMergeAvail, aboveMergeAvail, onlyEstMergeInfo )
//    void  sao_offset_pars ( ctbPars, compID, sliceEnabled, bitDepth )
//================================================================================

void CABACWriter::sao( const Slice& slice, unsigned ctuRsAddr )
{
  const SPS& sps = *slice.getSPS();
218
  if( !sps.getSAOEnabledFlag() )
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
  {
    return;
  }

  CodingStructure&     cs                     = *slice.getPic()->cs;
  const PreCalcValues& pcv                    = *cs.pcv;
  const SAOBlkParam&  sao_ctu_pars            = cs.picture->getSAO()[ctuRsAddr];
  bool                slice_sao_luma_flag     = ( slice.getSaoEnabledFlag( CHANNEL_TYPE_LUMA ) );
  bool                slice_sao_chroma_flag   = ( slice.getSaoEnabledFlag( CHANNEL_TYPE_CHROMA ) && sps.getChromaFormatIdc() != CHROMA_400 );
  if( !slice_sao_luma_flag && !slice_sao_chroma_flag )
  {
    return;
  }

  bool                sliceEnabled[3]         = { slice_sao_luma_flag, slice_sao_chroma_flag, slice_sao_chroma_flag };
  int                 frame_width_in_ctus     = pcv.widthInCtus;
  int                 ry                      = ctuRsAddr      / frame_width_in_ctus;
  int                 rx                      = ctuRsAddr - ry * frame_width_in_ctus;
  const Position      pos                     ( rx * cs.pcv->maxCUWidth, ry * cs.pcv->maxCUHeight );
  const unsigned      curSliceIdx             = slice.getIndependentSliceIdx();
#if HEVC_TILES_WPP
  const unsigned      curTileIdx              = cs.picture->tileMap->getTileIdxMap( pos );
  bool                leftMergeAvail          = cs.getCURestricted( pos.offset( -(int)pcv.maxCUWidth, 0  ), curSliceIdx, curTileIdx, CH_L ) ? true : false;
  bool                aboveMergeAvail         = cs.getCURestricted( pos.offset( 0, -(int)pcv.maxCUHeight ), curSliceIdx, curTileIdx, CH_L ) ? true : false;
#else
  bool                leftMergeAvail          = cs.getCURestricted( pos.offset( -(int)pcv.maxCUWidth, 0  ), curSliceIdx, CH_L ) ? true : false;
  bool                aboveMergeAvail         = cs.getCURestricted( pos.offset( 0, -(int)pcv.maxCUHeight ), curSliceIdx, CH_L ) ? true : false;
#endif
  sao_block_pars( sao_ctu_pars, sps.getBitDepths(), sliceEnabled, leftMergeAvail, aboveMergeAvail, false );
}


void CABACWriter::sao_block_pars( const SAOBlkParam& saoPars, const BitDepths& bitDepths, bool* sliceEnabled, bool leftMergeAvail, bool aboveMergeAvail, bool onlyEstMergeInfo )
{
  bool isLeftMerge  = false;
  bool isAboveMerge = false;
  if( leftMergeAvail )
  {
    // sao_merge_left_flag
    isLeftMerge   = ( saoPars[COMPONENT_Y].modeIdc == SAO_MODE_MERGE && saoPars[COMPONENT_Y].typeIdc == SAO_MERGE_LEFT );
    m_BinEncoder.encodeBin( (isLeftMerge), Ctx::SaoMergeFlag() );
  }
  if( aboveMergeAvail && !isLeftMerge )
  {
    // sao_merge_above_flag
    isAboveMerge  = ( saoPars[COMPONENT_Y].modeIdc == SAO_MODE_MERGE && saoPars[COMPONENT_Y].typeIdc == SAO_MERGE_ABOVE );
    m_BinEncoder.encodeBin( (isAboveMerge), Ctx::SaoMergeFlag() );
  }
  if( onlyEstMergeInfo )
  {
    return; //only for RDO
  }
  if( !isLeftMerge && !isAboveMerge )
  {
    // explicit parameters
    for( int compIdx=0; compIdx < MAX_NUM_COMPONENT; compIdx++ )
    {
      sao_offset_pars( saoPars[compIdx], ComponentID(compIdx), sliceEnabled[compIdx], bitDepths.recon[ toChannelType(ComponentID(compIdx)) ] );
    }
  }
}


void CABACWriter::sao_offset_pars( const SAOOffset& ctbPars, ComponentID compID, bool sliceEnabled, int bitDepth )
{
  if( !sliceEnabled )
  {
    CHECK( ctbPars.modeIdc != SAO_MODE_OFF, "Sao must be off, if it is disabled on slice level" );
    return;
  }
  const bool isFirstCompOfChType = ( getFirstComponentOfChannel( toChannelType(compID) ) == compID );

  if( isFirstCompOfChType )
  {
    // sao_type_idx_luma / sao_type_idx_chroma
    if( ctbPars.modeIdc == SAO_MODE_OFF )
    {
      m_BinEncoder.encodeBin  ( 0, Ctx::SaoTypeIdx() );
    }
    else if( ctbPars.typeIdc == SAO_TYPE_BO )
    {
      m_BinEncoder.encodeBin  ( 1, Ctx::SaoTypeIdx() );
      m_BinEncoder.encodeBinEP( 0 );
    }
    else
    {
      CHECK(!( ctbPars.typeIdc < SAO_TYPE_START_BO ), "Unspecified error");
      m_BinEncoder.encodeBin  ( 1, Ctx::SaoTypeIdx() );
      m_BinEncoder.encodeBinEP( 1 );
    }
  }

  if( ctbPars.modeIdc == SAO_MODE_NEW )
  {
    const int maxOffsetQVal = SampleAdaptiveOffset::getMaxOffsetQVal( bitDepth );
    int       numClasses    = ( ctbPars.typeIdc == SAO_TYPE_BO ? 4 : NUM_SAO_EO_CLASSES );
    int       k             = 0;
    int       offset[4];
    for( int i = 0; i < numClasses; i++ )
    {
      if( ctbPars.typeIdc != SAO_TYPE_BO && i == SAO_CLASS_EO_PLAIN )
      {
        continue;
      }
      int classIdx = ( ctbPars.typeIdc == SAO_TYPE_BO ? ( ctbPars.typeAuxInfo + i ) % NUM_SAO_BO_CLASSES : i );
      offset[k++]  = ctbPars.offset[classIdx];
    }

    // sao_offset_abs
    for( int i = 0; i < 4; i++ )
    {
      unsigned absOffset = ( offset[i] < 0 ? -offset[i] : offset[i] );
      unary_max_eqprob( absOffset, maxOffsetQVal );
    }

    // band offset mode
    if( ctbPars.typeIdc == SAO_TYPE_BO )
    {
      // sao_offset_sign
      for( int i = 0; i < 4; i++ )
      {
        if( offset[i] )
        {
          m_BinEncoder.encodeBinEP( (offset[i] < 0) );
        }
      }
      // sao_band_position
      m_BinEncoder.encodeBinsEP( ctbPars.typeAuxInfo, NUM_SAO_BO_CLASSES_LOG2 );
    }
    // edge offset mode
    else
    {
      if( isFirstCompOfChType )
      {
        // sao_eo_class_luma / sao_eo_class_chroma
        CHECK( ctbPars.typeIdc - SAO_TYPE_START_EO < 0, "sao edge offset class is outside valid range" );
        m_BinEncoder.encodeBinsEP( ctbPars.typeIdc - SAO_TYPE_START_EO, NUM_SAO_EO_TYPES_LOG2 );
      }
    }
  }
}



//================================================================================
//  clause 7.3.8.4
//--------------------------------------------------------------------------------
//    void  coding_tree       ( cs, partitioner, cuCtx )
//    void  split_cu_flag     ( split, cs, partitioner )
//    void  split_cu_mode_mt  ( split, cs, partitioner )
//================================================================================

void CABACWriter::coding_tree(const CodingStructure& cs, Partitioner& partitioner, CUCtx& cuCtx, Partitioner* pPartitionerChroma, CUCtx* pCuCtxChroma)
{
  const PPS      &pps         = *cs.pps;
  const UnitArea &currArea    = partitioner.currArea();
  const CodingUnit &cu        = *cs.getCU( currArea.blocks[partitioner.chType], partitioner.chType );

  // Reset delta QP coding flag and ChromaQPAdjustemt coding flag
378
379
380
381
382
383
384
385
#if JVET_M0113_M0188_QG_SIZE
  if( pps.getUseDQP() && partitioner.currQgEnable() )
  {
    cuCtx.qgStart    = true;
    cuCtx.isDQPCoded          = false;
  }
  if( cs.slice->getUseChromaQpAdj() && partitioner.currQgChromaEnable() )
#else
386
387
388
389
390
  if( pps.getUseDQP() && partitioner.currDepth <= pps.getMaxCuDQPDepth() )
  {
    cuCtx.isDQPCoded          = false;
  }
  if( cs.slice->getUseChromaQpAdj() && partitioner.currDepth <= pps.getPpsRangeExtension().getDiffCuChromaQpOffsetDepth() )
391
#endif
392
393
394
395
396
397
  {
    cuCtx.isChromaQpAdjCoded  = false;
  }
  // Reset delta QP coding flag and ChromaQPAdjustemt coding flag
  if (CS::isDualITree(cs) && pPartitionerChroma != nullptr)
  {
398
399
400
401
402
403
404
405
#if JVET_M0113_M0188_QG_SIZE
    if (pps.getUseDQP() && pPartitionerChroma->currQgEnable())
    {
      pCuCtxChroma->qgStart    = true;
      pCuCtxChroma->isDQPCoded = false;
    }
    if (cs.slice->getUseChromaQpAdj() && pPartitionerChroma->currQgChromaEnable())
#else
406
407
408
409
410
    if (pps.getUseDQP() && pPartitionerChroma->currDepth <= pps.getMaxCuDQPDepth())
    {
      pCuCtxChroma->isDQPCoded = false;
    }
    if (cs.slice->getUseChromaQpAdj() && pPartitionerChroma->currDepth <= pps.getPpsRangeExtension().getDiffCuChromaQpOffsetDepth())
411
#endif
412
413
414
415
416
    {
      pCuCtxChroma->isChromaQpAdjCoded = false;
    }
  }

Adam Wieckowski's avatar
Adam Wieckowski committed
417
418
419
420
421
422
423
424
425
426
#if JVET_M0421_SPLIT_SIG
  const PartSplit splitMode = CU::getSplitAtDepth( cu, partitioner.currDepth );

  split_cu_mode( splitMode, cs, partitioner );

  CHECK( !partitioner.canSplit( splitMode, cs ), "The chosen split mode is invalid!" );

  if( splitMode != CU_DONT_SPLIT )
  {
#else
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
  const PartSplit implicitSplit = partitioner.getImplicitSplit( cs );

  // QT
  bool canQtSplit = partitioner.canSplit( CU_QUAD_SPLIT, cs );

  if( canQtSplit )
  {
    // split_cu_flag
    bool qtSplit = implicitSplit == CU_QUAD_SPLIT;

    if( !qtSplit && implicitSplit != CU_QUAD_SPLIT )
    {
      qtSplit = ( cu.qtDepth > partitioner.currQtDepth );
      split_cu_flag( qtSplit, cs, partitioner );
    }

    // quad-tree split
    if( qtSplit )
    {
Adam Wieckowski's avatar
Adam Wieckowski committed
446
#endif
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
      if (CS::isDualITree(cs) && pPartitionerChroma != nullptr && (partitioner.currArea().lwidth() >= 64 || partitioner.currArea().lheight() >= 64))
      {
        partitioner.splitCurrArea(CU_QUAD_SPLIT, cs);
        pPartitionerChroma->splitCurrArea(CU_QUAD_SPLIT, cs);
        bool beContinue = true;
        bool lumaContinue = true;
        bool chromaContinue = true;

        while (beContinue)
        {
          if (partitioner.currArea().lwidth() > 64 || partitioner.currArea().lheight() > 64)
          {
            if (cs.picture->blocks[partitioner.chType].contains(partitioner.currArea().blocks[partitioner.chType].pos()))
            {
              coding_tree(cs, partitioner, cuCtx, pPartitionerChroma, pCuCtxChroma);
            }
            lumaContinue = partitioner.nextPart(cs);
            chromaContinue = pPartitionerChroma->nextPart(cs);
            CHECK(lumaContinue != chromaContinue, "luma chroma partition should be matched");
            beContinue = lumaContinue;
          }
          else
          {
            //dual tree coding under 64x64 block
            if (cs.picture->blocks[partitioner.chType].contains(partitioner.currArea().blocks[partitioner.chType].pos()))
            {
              coding_tree(cs, partitioner, cuCtx);
            }
            lumaContinue = partitioner.nextPart(cs);
            if (cs.picture->blocks[pPartitionerChroma->chType].contains(pPartitionerChroma->currArea().blocks[pPartitionerChroma->chType].pos()))
            {
              coding_tree(cs, *pPartitionerChroma, *pCuCtxChroma);
            }
            chromaContinue = pPartitionerChroma->nextPart(cs);
            CHECK(lumaContinue != chromaContinue, "luma chroma partition should be matched");
            beContinue = lumaContinue;
          }
        }
        partitioner.exitCurrSplit();
        pPartitionerChroma->exitCurrSplit();

      }
      else
      {
Adam Wieckowski's avatar
Adam Wieckowski committed
491
492
493
#if JVET_M0421_SPLIT_SIG
      partitioner.splitCurrArea( splitMode, cs );
#else
494
      partitioner.splitCurrArea( CU_QUAD_SPLIT, cs );
Adam Wieckowski's avatar
Adam Wieckowski committed
495
#endif
496
497
498
499
500
501
502
503
504
505
506
507

      do
      {
        if( cs.picture->blocks[partitioner.chType].contains( partitioner.currArea().blocks[partitioner.chType].pos() ) )
        {
          coding_tree( cs, partitioner, cuCtx );
        }
      } while( partitioner.nextPart( cs ) );

      partitioner.exitCurrSplit();
      }
      return;
Adam Wieckowski's avatar
Adam Wieckowski committed
508
#if !JVET_M0421_SPLIT_SIG
509
    }
Adam Wieckowski's avatar
Adam Wieckowski committed
510
#endif
511
512
  }

Adam Wieckowski's avatar
Adam Wieckowski committed
513
#if !JVET_M0421_SPLIT_SIG
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
  {
    bool mtSplit = partitioner.canSplit( CU_MT_SPLIT, cs );

    if( mtSplit )
    {
      const PartSplit splitMode = CU::getSplitAtDepth( cu, partitioner.currDepth );

      split_cu_mode_mt( splitMode, cs, partitioner );

      if( splitMode != CU_DONT_SPLIT )
      {
        partitioner.splitCurrArea( splitMode, cs );
        do
        {
          if( cs.picture->blocks[partitioner.chType].contains( partitioner.currArea().blocks[partitioner.chType].pos() ) )
          {
            coding_tree( cs, partitioner, cuCtx );
          }
        } while( partitioner.nextPart( cs ) );

        partitioner.exitCurrSplit();
        return;
      }
    }
  }

Adam Wieckowski's avatar
Adam Wieckowski committed
540
#endif
541
  // Predict QP on start of quantization group
542
543
544
545
546
#if JVET_M0113_M0188_QG_SIZE
  if( cuCtx.qgStart )
  {
    cuCtx.qgStart = false;
#else
547
  if( pps.getUseDQP() && !cuCtx.isDQPCoded && CU::isQGStart( cu, partitioner ) )
548
  {
549
#endif
550
551
552
553
554
555
556
557
558
559
560
    cuCtx.qp = CU::predictQP( cu, cuCtx.qp );
  }


  // coding unit
  coding_unit( cu, partitioner, cuCtx );

  DTRACE_COND( ( isEncoding() ), g_trace_ctx, D_QP, "x=%d, y=%d, w=%d, h=%d, qp=%d\n", cu.Y().x, cu.Y().y, cu.Y().width, cu.Y().height, cu.qp );
  DTRACE_BLOCK_REC_COND( ( !isEncoding() ), cs.picture->getRecoBuf( cu ), cu, cu.predMode );
}

Adam Wieckowski's avatar
Adam Wieckowski committed
561
562
563
564
565
566
567
568
569
570
#if JVET_M0421_SPLIT_SIG
void CABACWriter::split_cu_mode( const PartSplit split, const CodingStructure& cs, Partitioner& partitioner )
{
  bool canNo, canQt, canBh, canBv, canTh, canTv;
  partitioner.canSplit( cs, canNo, canQt, canBh, canBv, canTh, canTv );

  bool canSpl[6] = { canNo, canQt, canBh, canBv, canTh, canTv };

  unsigned ctxSplit = 0, ctxQtSplit = 0, ctxBttHV = 0, ctxBttH12 = 0, ctxBttV12;
  DeriveCtx::CtxSplit( cs, partitioner, ctxSplit, ctxQtSplit, ctxBttHV, ctxBttH12, ctxBttV12, canSpl );
571

Adam Wieckowski's avatar
Adam Wieckowski committed
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
  const bool canSplit = canBh || canBv || canTh || canTv || canQt;
  const bool isNo     = split == CU_DONT_SPLIT;

  if( canNo && canSplit )
  {
    m_BinEncoder.encodeBin( !isNo, Ctx::SplitFlag( ctxSplit ) );
  }

  DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctx=%d split=%d\n", ctxSplit, !isNo );

  if( isNo )
  {
    return;
  }

  const bool canBtt = canBh || canBv || canTh || canTv;
  const bool isQt   = split == CU_QUAD_SPLIT;

  if( canQt && canBtt )
  {
    m_BinEncoder.encodeBin( isQt, Ctx::SplitQtFlag( ctxQtSplit ) );
  }

  DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctx=%d qt=%d\n", ctxQtSplit, isQt );

  if( isQt )
  {
    return;
  }

  const bool canHor = canBh || canTh;
  const bool canVer = canBv || canTv;
  const bool  isVer = split == CU_VERT_SPLIT || split == CU_TRIV_SPLIT;

  if( canVer && canHor )
  {
    m_BinEncoder.encodeBin( isVer, Ctx::SplitHvFlag( ctxBttHV ) );
  }

  const bool can14 = isVer ? canTv : canTh;
  const bool can12 = isVer ? canBv : canBh;
  const bool  is12 = isVer ? ( split == CU_VERT_SPLIT ) : ( split == CU_HORZ_SPLIT );

  if( can12 && can14 )
  {
    m_BinEncoder.encodeBin( is12, Ctx::Split12Flag( isVer ? ctxBttV12 : ctxBttH12 ) );
  }

  DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctxHv=%d ctx12=%d mode=%d\n", ctxBttHV, isVer ? ctxBttV12 : ctxBttH12, split );
}
#else
623
624
void CABACWriter::split_cu_flag( bool split, const CodingStructure& cs, Partitioner& partitioner )
{
625
  unsigned maxQTDepth = ( g_aucLog2[cs.sps->getCTUSize()] - g_aucLog2[cs.sps->getMinQTSize(cs.slice->getSliceType(), partitioner.chType)] );
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
  if( partitioner.currDepth == maxQTDepth )
  {
    return;
  }
  unsigned  ctxId = DeriveCtx::CtxCUsplit( cs, partitioner );
  m_BinEncoder.encodeBin( (split), Ctx::SplitFlag(ctxId) );

  DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_flag() ctx=%d split=%d\n", ctxId, split ? 1 : 0 );
}

void CABACWriter::split_cu_mode_mt(const PartSplit split, const CodingStructure& cs, Partitioner& partitioner)
{
  unsigned ctxIdBT = DeriveCtx::CtxBTsplit( cs, partitioner );

  unsigned width   = partitioner.currArea().lumaSize().width;
  unsigned height  = partitioner.currArea().lumaSize().height;

643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
#if REMOVE_BIN_DECISION_TREE
  unsigned btSCtxId = width == height ? 0 : ( width > height ? 1 : 2 );

  const bool canNo  = partitioner.canSplit( CU_DONT_SPLIT, cs );
  const bool canBh  = partitioner.canSplit( CU_HORZ_SPLIT, cs );
  const bool canBv  = partitioner.canSplit( CU_VERT_SPLIT, cs );
  const bool canTh  = partitioner.canSplit( CU_TRIH_SPLIT, cs );
  const bool canTv  = partitioner.canSplit( CU_TRIV_SPLIT, cs );

  const bool canSplit = canBh || canBv || canTh || canTv;
  const bool isNo     = split == CU_DONT_SPLIT;

  if( canNo && canSplit )
  {
    m_BinEncoder.encodeBin( !isNo, Ctx::BTSplitFlag( ctxIdBT ) );
  }

  if( isNo )
  {
    DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode_mt() ctx=%d split=%d\n", ctxIdBT, split );

    return;
  }

  const bool canHor = canBh || canTh;
  const bool canVer = canBv || canTv;
  const bool  isVer = split == CU_VERT_SPLIT || split == CU_TRIV_SPLIT;

  if( canVer && canHor )
  {
    m_BinEncoder.encodeBin( isVer, Ctx::BTSplitFlag( 12 + btSCtxId ) );
  }

  const bool can14 = isVer ? canTv : canTh;
  const bool can12 = isVer ? canBv : canBh;
  const bool  is12 = isVer ? ( split == CU_VERT_SPLIT ) : ( split == CU_HORZ_SPLIT );


  if( can12 && can14 )
  {
    m_BinEncoder.encodeBin( is12, Ctx::BTSplitFlag( 15 ) );
  }
#else
686
687
688
689
690
691
692
693
694
695
696
  DecisionTree dt( g_mtSplitDTT );

  dt.setAvail( DTT_SPLIT_BT_HORZ,  partitioner.canSplit( CU_HORZ_SPLIT, cs ) );
  dt.setAvail( DTT_SPLIT_BT_VERT,  partitioner.canSplit( CU_VERT_SPLIT, cs ) );

  dt.setAvail( DTT_SPLIT_TT_HORZ,  partitioner.canSplit( CU_TRIH_SPLIT, cs ) );
  dt.setAvail( DTT_SPLIT_TT_VERT,  partitioner.canSplit( CU_TRIV_SPLIT, cs ) );
  dt.setAvail( DTT_SPLIT_NO_SPLIT, partitioner.canSplit( CU_DONT_SPLIT, cs ) );

  unsigned btSCtxId = width == height ? 0 : ( width > height ? 1 : 2 );
  dt.setCtxId( DTT_SPLIT_DO_SPLIT_DECISION,   Ctx::BTSplitFlag( ctxIdBT ) );
697
698
699
700
  dt.setCtxId( DTT_SPLIT_HV_DECISION,         Ctx::BTSplitFlag( 12 + btSCtxId ) );

  dt.setCtxId( DTT_SPLIT_H_IS_BT_12_DECISION, Ctx::BTSplitFlag( 15 ) );
  dt.setCtxId( DTT_SPLIT_V_IS_BT_12_DECISION, Ctx::BTSplitFlag( 15 ) );
701
702
703


  encode_sparse_dt( dt, split == CU_DONT_SPLIT ? ( unsigned ) DTT_SPLIT_NO_SPLIT : ( unsigned ) split );
704
#endif
705
706
707

  DTRACE(g_trace_ctx, D_SYNTAX, "split_cu_mode_mt() ctx=%d split=%d\n", ctxIdBT, split);
}
Adam Wieckowski's avatar
Adam Wieckowski committed
708
#endif
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731

//================================================================================
//  clause 7.3.8.5
//--------------------------------------------------------------------------------
//    void  coding_unit               ( cu, partitioner, cuCtx )
//    void  cu_transquant_bypass_flag ( cu )
//    void  cu_skip_flag              ( cu )
//    void  pred_mode                 ( cu )
//    void  part_mode                 ( cu )
//    void  pcm_flag                  ( cu )
//    void  pcm_samples               ( tu )
//    void  cu_pred_data              ( pus )
//    void  cu_lic_flag               ( cu )
//    void  intra_luma_pred_modes     ( pus )
//    void  intra_chroma_pred_mode    ( pu )
//    void  cu_residual               ( cu, partitioner, cuCtx )
//    void  rqt_root_cbf              ( cu )
//    void  end_of_ctu                ( cu, cuCtx )
//================================================================================

void CABACWriter::coding_unit( const CodingUnit& cu, Partitioner& partitioner, CUCtx& cuCtx )
{
  CodingStructure& cs = *cu.cs;
Xiaozhong Xu's avatar
Xiaozhong Xu committed
732
  cs.chType = partitioner.chType;
733
734
735
736
737
738
739
  // transquant bypass flag
  if( cs.pps->getTransquantBypassEnabledFlag() )
  {
    cu_transquant_bypass_flag( cu );
  }

  // skip flag
Yu Han's avatar
Yu Han committed
740
#if JVET_M0483_IBC
Yu Han's avatar
Yu Han committed
741
  if ((!cs.slice->isIntra() || cs.slice->getSPS()->getIBCFlag()) && cu.Y().valid())
Yu Han's avatar
Yu Han committed
742
#else
Xiaozhong Xu's avatar
Xiaozhong Xu committed
743
  if (!cs.slice->isIntra() && cu.Y().valid())
Yu Han's avatar
Yu Han committed
744
#endif
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
  {
    cu_skip_flag( cu );
  }


  // skip data
  if( cu.skip )
  {
    CHECK( !cu.firstPU->mergeFlag, "Merge flag has to be on!" );
    PredictionUnit&   pu = *cu.firstPU;
    prediction_unit ( pu );
    end_of_ctu      ( cu, cuCtx );
    return;
  }

760
#if !FIX_PCM
761
  // pcm samples
762
  if( CU::isIntra(cu) )
763
764
765
766
767
768
769
770
  {
    pcm_data( cu, partitioner );
    if( cu.ipcm )
    {
      end_of_ctu( cu, cuCtx );
      return;
    }
  }
771
#endif
772

773
774
775
  // prediction mode and partitioning data
  pred_mode ( cu );

776
777
778
779
780
781
782
783
784
785
786
787
#if FIX_PCM
  // pcm samples
  if( CU::isIntra(cu) )
  {
    pcm_data( cu, partitioner );
    if( cu.ipcm )
    {
      end_of_ctu( cu, cuCtx );
      return;
    }
  }
#endif
788
789
  extend_ref_line(cu);

790
#if JVET_M0102_INTRA_SUBPARTITIONS
791
792
  isp_mode( cu );
#endif
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813

  // prediction data ( intra prediction modes / reference indexes + motion vectors )
  cu_pred_data( cu );

  // residual data ( coded block flags + transform coefficient levels )
  cu_residual( cu, partitioner, cuCtx );

  // end of cu
  end_of_ctu( cu, cuCtx );
}


void CABACWriter::cu_transquant_bypass_flag( const CodingUnit& cu )
{
  m_BinEncoder.encodeBin( (cu.transQuantBypass), Ctx::TransquantBypassFlag() );
}


void CABACWriter::cu_skip_flag( const CodingUnit& cu )
{
  unsigned ctxId = DeriveCtx::CtxSkipFlag( cu );
Yu Han's avatar
Yu Han committed
814

Yu Han's avatar
Yu Han committed
815
#if JVET_M0483_IBC
Yu Han's avatar
Yu Han committed
816
  if (cu.slice->isIntra() && cu.cs->slice->getSPS()->getIBCFlag())
Yu Han's avatar
Yu Han committed
817
  {
Yu Han's avatar
Yu Han committed
818
    m_BinEncoder.encodeBin((cu.skip), Ctx::SkipFlag(ctxId));
Yu Han's avatar
Yu Han committed
819
820
821
822
823
    DTRACE(g_trace_ctx, D_SYNTAX, "cu_skip_flag() ctx=%d skip=%d\n", ctxId, cu.skip ? 1 : 0);
    return;
  }
#endif

824
825
826
  m_BinEncoder.encodeBin( ( cu.skip ), Ctx::SkipFlag( ctxId ) );

  DTRACE( g_trace_ctx, D_SYNTAX, "cu_skip_flag() ctx=%d skip=%d\n", ctxId, cu.skip ? 1 : 0 );
Yu Han's avatar
Yu Han committed
827
#if JVET_M0483_IBC
Yu Han's avatar
Yu Han committed
828
  if (cu.skip && cu.cs->slice->getSPS()->getIBCFlag())
Yu Han's avatar
Yu Han committed
829
  {
Yu Han's avatar
Yu Han committed
830
831
832
    unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
    m_BinEncoder.encodeBin(CU::isIBC(cu) ? 1 : 0, Ctx::IBCFlag(ctxidx));
    DTRACE(g_trace_ctx, D_SYNTAX, "ibc() ctx=%d cu.predMode=%d\n", ctxidx, cu.predMode);
Frank Bossen's avatar
Frank Bossen committed
833
#if !JVET_MMVD_OFF_MACRO
Yu Han's avatar
Yu Han committed
834
835
836
837
838
    if (CU::isInter(cu))
    {
      m_BinEncoder.encodeBin(cu.mmvdSkip, Ctx::MmvdFlag(0));
      DTRACE(g_trace_ctx, D_SYNTAX, "mmvd_cu_skip_flag() ctx=%d mmvd_skip=%d\n", 0, cu.mmvdSkip ? 1 : 0);
    }
Frank Bossen's avatar
Frank Bossen committed
839
#endif
Yu Han's avatar
Yu Han committed
840
  }
Frank Bossen's avatar
Frank Bossen committed
841
#if !JVET_MMVD_OFF_MACRO
Yu Han's avatar
Yu Han committed
842
  if (cu.skip && !cu.cs->slice->getSPS()->getIBCFlag())
Yu Han's avatar
Yu Han committed
843
844
845
846
  {
    m_BinEncoder.encodeBin(cu.mmvdSkip, Ctx::MmvdFlag(0));
    DTRACE(g_trace_ctx, D_SYNTAX, "mmvd_cu_skip_flag() ctx=%d mmvd_skip=%d\n", 0, cu.mmvdSkip ? 1 : 0);
  }
Frank Bossen's avatar
Frank Bossen committed
847
#endif
Yu Han's avatar
Yu Han committed
848
#else
Frank Bossen's avatar
Frank Bossen committed
849
#if !JVET_MMVD_OFF_MACRO
850
851
852
853
854
  if (cu.skip)
  {
    m_BinEncoder.encodeBin(cu.mmvdSkip, Ctx::MmvdFlag(0));
    DTRACE(g_trace_ctx, D_SYNTAX, "mmvd_cu_skip_flag() ctx=%d mmvd_skip=%d\n", 0, cu.mmvdSkip ? 1 : 0);
  }
Yu Han's avatar
Yu Han committed
855
#endif
Frank Bossen's avatar
Frank Bossen committed
856
#endif
857
858
859
860
861
}


void CABACWriter::pred_mode( const CodingUnit& cu )
{
Yu Han's avatar
Yu Han committed
862
#if JVET_M0483_IBC
Yu Han's avatar
Yu Han committed
863
  if (cu.cs->slice->getSPS()->getIBCFlag())
Yu Han's avatar
Yu Han committed
864
865
  {
#endif
Yu Han's avatar
Yu Han committed
866
#if JVET_M0483_IBC
Yu Han's avatar
Yu Han committed
867
868
    if (cu.cs->slice->isIntra())
    {
Yu Han's avatar
Yu Han committed
869
870
      unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
      m_BinEncoder.encodeBin(CU::isIBC(cu), Ctx::IBCFlag(ctxidx));
Yu Han's avatar
Yu Han committed
871
872
873
874
875
876
877
878
879
880
    }
    else
    {
#if JVET_M0502_PRED_MODE_CTX
      m_BinEncoder.encodeBin((CU::isIntra(cu)), Ctx::PredMode(DeriveCtx::CtxPredModeFlag(cu)));
#else
      m_BinEncoder.encodeBin((CU::isIntra(cu)), Ctx::PredMode());
#endif
      if (!CU::isIntra(cu))
      {
Yu Han's avatar
Yu Han committed
881
882
        unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
        m_BinEncoder.encodeBin(CU::isIBC(cu), Ctx::IBCFlag(ctxidx));
Yu Han's avatar
Yu Han committed
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
      }
    }
  }
  else
  {
    if (cu.cs->slice->isIntra())
    {
      return;
    }
#if JVET_M0502_PRED_MODE_CTX
    m_BinEncoder.encodeBin((CU::isIntra(cu)), Ctx::PredMode(DeriveCtx::CtxPredModeFlag(cu)));
#else
    m_BinEncoder.encodeBin((CU::isIntra(cu)), Ctx::PredMode());
#endif
  }
#else
899
900
901
902
  if( cu.cs->slice->isIntra() )
  {
    return;
  }
Xin Zhao's avatar
Xin Zhao committed
903
904
905
#if JVET_M0502_PRED_MODE_CTX
  m_BinEncoder.encodeBin( ( CU::isIntra( cu ) ), Ctx::PredMode( DeriveCtx::CtxPredModeFlag( cu ) ) );
#else
906
  m_BinEncoder.encodeBin( ( CU::isIntra( cu ) ), Ctx::PredMode() );
Xin Zhao's avatar
Xin Zhao committed
907
#endif
Yu Han's avatar
Yu Han committed
908
#endif
909
910
}

911
void CABACWriter::pcm_data( const CodingUnit& cu, Partitioner& partitioner  )
912
{
913
  pcm_flag( cu, partitioner );
914
915
916
917
918
919
920
  if( cu.ipcm )
  {
    m_BinEncoder.pcmAlignBits();
    pcm_samples( *cu.firstTU );
  }
}

921
void CABACWriter::pcm_flag( const CodingUnit& cu, Partitioner& partitioner )
922
923
{
  const SPS& sps = *cu.cs->sps;
924
925
  if( !sps.getPCMEnabledFlag() || cu.lwidth() > (1 << sps.getPCMLog2MaxSize()) || cu.lwidth() < (1 << sps.getPCMLog2MinSize())
      || cu.lheight() > (1 << sps.getPCMLog2MaxSize()) || cu.lheight() < (1 << sps.getPCMLog2MinSize()) )
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
  {
    return;
  }
  m_BinEncoder.encodeBinTrm( cu.ipcm );
}


void CABACWriter::cu_pred_data( const CodingUnit& cu )
{
  if( CU::isIntra( cu ) )
  {
    intra_luma_pred_modes  ( cu );
    intra_chroma_pred_modes( cu );
    return;
  }
Xiaozhong Xu's avatar
Xiaozhong Xu committed
941
942
943
944
  if (!cu.Y().valid()) // dual tree chroma CU
  {
    return;
  }
945
946
947
948
949
950
  for( auto &pu : CU::traversePUs( cu ) )
  {
    prediction_unit( pu );
  }

  imv_mode   ( cu );
951
952
953
#if JVET_M0246_AFFINE_AMVR
  affine_amvr_mode( cu );
#endif
954

955
956
  cu_gbi_flag( cu );

957
958
}

959
960
961
962
963
964
965
966
967
968
void CABACWriter::cu_gbi_flag(const CodingUnit& cu)
{
  if(!CU::isGBiIdxCoded(cu))
  {
    return;
  }

  CHECK(!(GBI_NUM > 1 && (GBI_NUM == 2 || (GBI_NUM & 0x01) == 1)), " !( GBI_NUM > 1 && ( GBI_NUM == 2 || ( GBI_NUM & 0x01 ) == 1 ) ) ");
  const uint8_t gbiCodingIdx = (uint8_t)g_GbiCodingOrder[CU::getValidGbiIdx(cu)];

969
  const int32_t numGBi = (cu.slice->getCheckLDC()) ? 5 : 3;
970

971
  m_BinEncoder.encodeBin((gbiCodingIdx == 0 ? 1 : 0), Ctx::GBiIdx(0));
972
973
974

  if(numGBi > 2 && gbiCodingIdx != 0)
  {
975
976
    const uint32_t prefixNumBits = numGBi - 2;
    const uint32_t step = 1;
977
978
979
980
981

    int ctxIdGBi = 4;
    uint8_t idx = 1;
    for(int ui = 0; ui < prefixNumBits; ++ui)
    {
982
      if (gbiCodingIdx == idx)
983
984
985
986
987
988
989
990
991
992
993
994
      {
        m_BinEncoder.encodeBin(1, Ctx::GBiIdx(ctxIdGBi));
        break;
      }
      else
      {
        m_BinEncoder.encodeBin(0, Ctx::GBiIdx(ctxIdGBi));
        ctxIdGBi += step;
        idx += step;
      }
    }
  }
995

996
997
  DTRACE(g_trace_ctx, D_SYNTAX, "cu_gbi_flag() gbi_idx=%d\n", cu.GBiIdx ? 1 : 0);
}
998

ling's avatar
ling committed
999
void CABACWriter::xWriteTruncBinCode(uint32_t symbol, uint32_t maxSymbol)
ling's avatar
ling committed
1000
{