vopsedec.cpp

网络MPEG4IP流媒体开发源代码

		if (! m_volmd.bTextureComplexityEstimationSet1Disable) {
			m_volmd.bIntraBlocks = m_pbitstrmIn -> getBits (1);
			m_volmd.bInterBlocks = m_pbitstrmIn -> getBits (1);
			m_volmd.bInter4vBlocks = m_pbitstrmIn -> getBits (1);
			m_volmd.bNotCodedBlocks = m_pbitstrmIn -> getBits (1);
			if (!(m_volmd.bIntraBlocks ||
				  m_volmd.bInterBlocks ||
				  m_volmd.bInter4vBlocks ||
				  m_volmd.bNotCodedBlocks)) {
				fatal_error("Texture complexity estimation set 1 is enabled,\nbut no correponding flag is enabled.");
			}
		}
		else
			m_volmd.bIntraBlocks =
			m_volmd.bInterBlocks =
			m_volmd.bInter4vBlocks =
			m_volmd.bNotCodedBlocks = false;
		
		uiMark = m_pbitstrmIn -> getBits (1);
		assert (uiMark == 1);

		m_volmd.bTextureComplexityEstimationSet2Disable = m_pbitstrmIn -> getBits (1);
		if (! m_volmd.bTextureComplexityEstimationSet2Disable) {
			m_volmd.bDCTCoefs = m_pbitstrmIn -> getBits (1);
			m_volmd.bDCTLines = m_pbitstrmIn -> getBits (1);
			m_volmd.bVLCSymbols = m_pbitstrmIn -> getBits (1);
			m_volmd.bVLCBits = m_pbitstrmIn -> getBits (1);
			if (!(m_volmd.bDCTCoefs ||
				  m_volmd.bDCTLines ||
				  m_volmd.bVLCSymbols ||
				  m_volmd.bVLCBits)) {
				fatal_error("Texture complexity estimation set 2 is enabled,\nbut no correponding flag is enabled.");
			}
		}
		else
			m_volmd.bDCTCoefs =
			m_volmd.bDCTLines =
			m_volmd.bVLCSymbols =
			m_volmd.bVLCBits = false;

		m_volmd.bMotionCompensationComplexityDisable = m_pbitstrmIn -> getBits (1);
		if (! m_volmd.bMotionCompensationComplexityDisable) {
			m_volmd.bAPM = m_pbitstrmIn -> getBits (1);
			m_volmd.bNPM = m_pbitstrmIn -> getBits (1);
			m_volmd.bInterpolateMCQ = m_pbitstrmIn -> getBits (1);
			m_volmd.bForwBackMCQ = m_pbitstrmIn -> getBits (1);
			m_volmd.bHalfpel2 = m_pbitstrmIn -> getBits (1);
			m_volmd.bHalfpel4 = m_pbitstrmIn -> getBits (1);
			if (!(m_volmd.bAPM ||
				  m_volmd.bNPM ||
				  m_volmd.bInterpolateMCQ ||
				  m_volmd.bForwBackMCQ ||
				  m_volmd.bHalfpel2 ||
				  m_volmd.bHalfpel4)) {
				fatal_error("Motion complexity estimation is enabled,\nbut no correponding flag is enabled.");
			}
		}
		else
			m_volmd.bAPM =
			m_volmd.bNPM =
			m_volmd.bInterpolateMCQ =
			m_volmd.bForwBackMCQ =
			m_volmd.bHalfpel2 =
			m_volmd.bHalfpel4 = false;
		
		uiMark = m_pbitstrmIn -> getBits (1);
		assert (uiMark == 1);
	}
	// END: Complexity Estimation syntax support

	/* UInt uiResyncMarkerDisable = wmay */m_pbitstrmIn -> getBits (1);

	//	Modified by Toshiba(1998-4-7)
	m_volmd.bDataPartitioning = m_pbitstrmIn -> getBits (1);
	if( m_volmd.bDataPartitioning )
		m_volmd.bReversibleVlc = m_pbitstrmIn -> getBits (1);
	else
		m_volmd.bReversibleVlc = FALSE;
	//	End Toshiba
	//wchen: wd changes
	m_volmd.volType = (m_pbitstrmIn -> getBits (1) == 0) ? BASE_LAYER : ENHN_LAYER;
	m_volmd.ihor_sampling_factor_n = 1;
	m_volmd.ihor_sampling_factor_m = 1;
	m_volmd.iver_sampling_factor_n = 1;
	m_volmd.iver_sampling_factor_m = 1;	
	if (m_volmd.volType == ENHN_LAYER)	{
//#ifdef _Scalable_SONY_
		m_volmd.iHierarchyType = m_pbitstrmIn->getBits (1); // 
		if(m_volmd.iHierarchyType == 0)
			fprintf(stdout,"Hierarchy_Type == 0 (Spatial scalability)\n");
		else if(m_volmd.iHierarchyType == 1)
			fprintf(stdout,"Hierarchy_type == 1 (Temporal scalability)\n");
//#endif _Scalable_SONY_
		m_pbitstrmIn->getBits (4);						// ref_layer_id
		m_pbitstrmIn->getBits (1);						// ref_layer_samping_director
		m_volmd.ihor_sampling_factor_n = m_pbitstrmIn->getBits (5);
		m_volmd.ihor_sampling_factor_m = m_pbitstrmIn->getBits (5);
		m_volmd.iver_sampling_factor_n = m_pbitstrmIn->getBits (5);
		m_volmd.iver_sampling_factor_m = m_pbitstrmIn->getBits (5);
		m_volmd.iEnhnType     = m_pbitstrmIn->getBits (1);			//enhancement_type
	}

	m_volmd.bDeblockFilterDisable = TRUE;							//no deblocking filter
}

Void CVideoObjectDecoder::FakeOutVOVOLHead (int h, int w, int fr, Bool *pbSpatialScalability)
{
  m_volmd.iClockRate = fr;
  Int iClockRate = m_volmd.iClockRate;
  assert (iClockRate >= 1 && iClockRate < 65536);
  for (m_iNumBitsTimeIncr = 1; m_iNumBitsTimeIncr < NUMBITS_TIME_RESOLUTION; m_iNumBitsTimeIncr++)	{	
    if (iClockRate == 1)			
      break;
    iClockRate = (iClockRate >> 1);
  }
  m_volmd.bShapeOnly = FALSE;
  m_volmd.fAUsage = RECTANGLE;
  m_ivolWidth = w;
  m_ivolHeight = h;
  m_vopmd.bInterlace = 0;
  m_volmd.bAdvPredDisable = 1;
  m_uiSprite = 0;
  m_volmd.bNot8Bit = 0;
  m_volmd.uiQuantPrecision = 5;
  m_volmd.nBits = 8;
  m_volmd.fQuantizer = Q_H263;
#if 0
  m_volmd.bLoadIntraMatrix = 0;
  memcpy (m_volmd.rgiIntraQuantizerMatrix, rgiDefaultIntraQMatrix, BLOCK_SQUARE_SIZE * sizeof (Int));
  m_volmd.bLoadInterMatrix = 0;
  memcpy (m_volmd.rgiInterQuantizerMatrix, rgiDefaultInterQMatrix, BLOCK_SQUARE_SIZE * sizeof (Int));
#endif
  m_volmd.bComplexityEstimationDisable = 1; // huh ?
  m_volmd.bDataPartitioning = 0;
  m_volmd.bReversibleVlc = FALSE;
  m_volmd.volType = BASE_LAYER;
  m_volmd.ihor_sampling_factor_n = 1;
  m_volmd.ihor_sampling_factor_m = 1;
  m_volmd.iver_sampling_factor_n = 1;
  m_volmd.iver_sampling_factor_m = 1;	
  m_volmd.bDeblockFilterDisable = TRUE;
  postVO_VOLHeadInit(w, h, pbSpatialScalability);
}


Int BGComposition; // added by Sharp (98/3/24)

Bool CVideoObjectDecoder::decodeVOPHead ()
{
	// Start code
  UInt uiVopStartCode = m_pbitstrmIn -> getBits (NUMBITS_VOP_START_CODE);
  while (uiVopStartCode == GOV_START_CODE ||
	 (uiVopStartCode >= 0 && uiVopStartCode <= 0x1f) ||
	 uiVopStartCode == SESSION_START_CODE ||
	 uiVopStartCode == VISUAL_OBJ_START_CODE ||
	 (uiVopStartCode >= 0x20 && uiVopStartCode <= 0x2f)) {
    if (uiVopStartCode >= 0 && uiVopStartCode <= 0x1f) {
      decodeVOBody();
    } else if (uiVopStartCode >= 0x20 && uiVopStartCode <= 0x2f) {
      decodeVOLBody();
    } else 
      switch (uiVopStartCode) {
      case GOV_START_CODE: {
	/*Added by SONY (98/03/30)*/
	m_bUseGOV = TRUE;
	m_bLinkisBroken = FALSE;
	/*Added by SONY (98/03/30) End */
	Int timecode;
	timecode = m_pbitstrmIn -> getBits (5) * 3600;
	timecode += m_pbitstrmIn -> getBits (6) * 60;
	m_pbitstrmIn -> getBits (1);
	timecode += m_pbitstrmIn -> getBits (6);
	
	m_tModuloBaseDecd = timecode;
	m_tModuloBaseDisp = timecode;
#ifdef DEBUG_OUTPUT
	cout << "GOV Header (t=" << timecode << ")\n\n";
#endif
	Int closed_gov = m_pbitstrmIn -> getBits (1);
	Int broken_link = m_pbitstrmIn -> getBits (1);
	/*modified by SONY (98/03/30)*/
	if ((closed_gov == 0)&&(broken_link == 1))
	  m_bLinkisBroken = TRUE;
      }
        break;
      default:
	break;
      }
/*modified by SONY (98/03/30) End*/
		
    Int err = findStartCode();
    if (err == EOF) return FALSE;
    uiVopStartCode = m_pbitstrmIn -> getBits (NUMBITS_VOP_START_CODE);
  }
//980212
  if (uiVopStartCode != VOP_START_CODE) {
    printf("Illegal VOP start code %x found in header", uiVopStartCode);
  }
	assert(uiVopStartCode == VOP_START_CODE);
	if (m_pbitstrmIn->peekBits(NUMBITS_START_CODE_PREFIX) == START_CODE_PREFIX) {
	  return decodeVOPHead();
	}

	m_vopmd.vopPredType = (VOPpredType) m_pbitstrmIn -> getBits (NUMBITS_VOP_PRED_TYPE);
	// Time reference and VOP_pred_type
	Int iModuloInc = 0;
	while (m_pbitstrmIn -> getBits (1) != 0)
		iModuloInc++;
	Time tCurrSec = iModuloInc + ((m_vopmd.vopPredType != BVOP ||
				  (m_vopmd.vopPredType == BVOP && m_volmd.volType == ENHN_LAYER ))?
				m_tModuloBaseDecd : m_tModuloBaseDisp);
	//	Added for error resilient mode by Toshiba(1997-11-14)
	UInt uiMarker = m_pbitstrmIn -> getBits (1);
	assert(uiMarker== 1);
	//	End Toshiba(1997-11-14)
	Time tVopIncr = m_pbitstrmIn -> getBits (m_iNumBitsTimeIncr);
#if 0
        printf("time bits is supposed to be %d\n", m_iNumBitsTimeIncr);
#endif
	uiMarker = m_pbitstrmIn->getBits (1); // marker bit
	assert(uiMarker ==1);
	m_tOldModuloBaseDecd = m_tModuloBaseDecd;
	m_tOldModuloBaseDisp = m_tModuloBaseDisp;
	if (m_vopmd.vopPredType != BVOP ||
		(m_vopmd.vopPredType == BVOP && m_volmd.volType == ENHN_LAYER ))

	{
		m_tModuloBaseDisp = m_tModuloBaseDecd;		//update most recently displayed time base
		m_tModuloBaseDecd = tCurrSec;
	}

    m_t = tCurrSec * m_volmd.iClockRate*m_iClockRateScale + tVopIncr*m_iClockRateScale;
	
	if (m_pbitstrmIn->getBits (1) == 0)		{		//vop_coded == false
		m_vopmd.bInterlace = FALSE;	//wchen: temporary solution
		return FALSE;
	}

	if (m_vopmd.vopPredType == PVOP && m_volmd.bShapeOnly==FALSE)
		m_vopmd.iRoundingControl = m_pbitstrmIn->getBits (1); //"VOP_Rounding_Type"
	else
		m_vopmd.iRoundingControl = 0;

	if (m_volmd.fAUsage != RECTANGLE) {
// Begin: modified by Hughes	  4/9/98
	  if (!(m_uiSprite == 1 && m_vopmd.vopPredType == IVOP)) {
// End: modified by Hughes	  4/9/98

		Int width = m_pbitstrmIn -> getBits (NUMBITS_VOP_WIDTH);
// spt VOP		assert (width % MB_SIZE == 0); // for sprite, may not be multiple of MB_SIZE
		Int marker;
		marker = m_pbitstrmIn -> getBits (1); // marker bit
		assert(marker==1);
		Int height = m_pbitstrmIn -> getBits (NUMBITS_VOP_HEIGHT);
// spt VOP		assert (height % MB_SIZE == 0); // for sprite, may not be multiple of MB_SIZE
		marker = m_pbitstrmIn -> getBits (1); // marker bit
		assert(marker==1);
		//wchen: cd changed to 2s complement
		Int left = (m_pbitstrmIn -> getBits (1) == 0) ?
					m_pbitstrmIn->getBits (NUMBITS_VOP_HORIZONTAL_SPA_REF - 1) : 
					((Int)m_pbitstrmIn->getBits (NUMBITS_VOP_HORIZONTAL_SPA_REF - 1) - (1 << (NUMBITS_VOP_HORIZONTAL_SPA_REF - 1)));
		marker = m_pbitstrmIn -> getBits (1); // marker bit
		assert(marker==1);
		Int top = (m_pbitstrmIn -> getBits (1) == 0) ?
				   m_pbitstrmIn->getBits (NUMBITS_VOP_VERTICAL_SPA_REF - 1) : 
				   ((Int)m_pbitstrmIn->getBits (NUMBITS_VOP_VERTICAL_SPA_REF - 1) - (1 << (NUMBITS_VOP_VERTICAL_SPA_REF - 1)));
		assert(((left | top)&1)==0); // must be even pix unit

		m_rctCurrVOPY = CRct (left, top, left + width, top + height);
		m_rctCurrVOPUV = m_rctCurrVOPY.downSampleBy2 ();
	  }


		if ( m_volmd.volType == ENHN_LAYER && m_volmd.iEnhnType == 1 ){
			BGComposition = m_pbitstrmIn -> getBits (1); // modified by Sharp (98/3/24)
//			assert(BackgroundComposition==1); // modified by Sharp (98/3/24)
		}

		m_volmd.bNoCrChange = m_pbitstrmIn -> getBits (1);	//VOP_CR_Change_Disable
		Int iVopConstantAlpha = m_pbitstrmIn -> getBits (1);
		if(iVopConstantAlpha==1)
			m_vopmd.iVopConstantAlphaValue = m_pbitstrmIn -> getBits (8);
		else
			m_vopmd.iVopConstantAlphaValue = 255;
		m_vopmd.bShapeCodingType = (m_vopmd.vopPredType == IVOP) ? 0 : 1; //	Added error resilient mode by Toshiba(1998-1-16)
	}

	// START: Complexity Estimation syntax support - Marc Mongenet (EPFL) - 15 Jun 1998

	if (! m_volmd.bComplexityEstimationDisable) {

		if (m_volmd.iEstimationMethod != 0) {
			fprintf (stderr, "ERROR: Unknown estimation method number %d.\n", m_volmd.iEstimationMethod);
			exit (1);
		}
		
		if (m_vopmd.vopPredType == IVOP ||
			m_vopmd.vopPredType == PVOP ||
			m_vopmd.vopPredType == BVOP) {

			if (m_volmd.bOpaque) {
				printf ("dcecs_opaque = %d\n", m_vopmd.iOpaque = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iOpaque == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'opaque' complexity estimation.\n");
					exit (1);
				}
			}
			if (m_volmd.bTransparent) {
				printf ("dcecs_transparent = %d\n", m_vopmd.iTransparent = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iTransparent == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'transparent' complexity estimation.\n");
					exit (1);
				}
			}
			if (m_volmd.bIntraCAE) {
				printf ("dcecs_intra_cae = %d\n", m_vopmd.iIntraCAE = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iIntraCAE == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'intra_cae' complexity estimation.\n");
					exit (1);
				}
			}
			if (m_volmd.bInterCAE) {
				printf ("dcecs_inter_cae = %d\n", m_vopmd.iInterCAE = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iInterCAE == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'inter_cae' complexity estimation.\n");
					exit (1);
				}
			}
			if (m_volmd.bNoUpdate) {
				printf ("dcecs_no_update = %d\n", m_vopmd.iNoUpdate = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iNoUpdate == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'no_update' complexity estimation.\n");
					exit (1);
				}
			}
			if (m_volmd.bUpsampling) {
				printf ("dcecs_upsampling = %d\n", m_vopmd.iUpsampling = m_pbitstrmIn -> getBits (8));
				if (m_vopmd.iUpsampling == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'upsampling' complexity estimation.\n");
					exit (1);
				}
			}
		}

		if (m_volmd.bIntraBlocks) {
			printf ("dcecs_intra_blocks = %d\n", m_vopmd.iIntraBlocks = m_pbitstrmIn -> getBits (8));
			if (m_vopmd.iIntraBlocks == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'intra_blocks' complexity estimation.\n");
					exit (1);
				}
		}
		if (m_volmd.bNotCodedBlocks) {
			printf ("dcecs_not_coded_blocks = %d\n", m_vopmd.iNotCodedBlocks = m_pbitstrmIn -> getBits (8));
			if (m_vopmd.iNotCodedBlocks == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'not_coded_blocks' complexity estimation.\n");
					exit (1);
				}
		}
		if (m_volmd.bDCTCoefs) {
			printf ("dcecs_dct_coefs = %d\n", m_vopmd.iDCTCoefs = m_pbitstrmIn -> getBits (8));
			if (m_vopmd.iDCTCoefs == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'dct_coefs' complexity estimation.\n");
					exit (1);
				}
		}
		if (m_volmd.bDCTLines) {
			printf ("dcecs_dct_lines = %d\n", m_vopmd.iDCTLines = m_pbitstrmIn -> getBits (8));
			if (m_vopmd.iDCTLines == 0) {
					fprintf (stderr, "ERROR: Illegal null value for 'dct_lines' complexity estimation.\n");
					exit (1);
				}
		}
		if (m_volmd.bVLCSymbols) {
			printf ("dcecs_vlc_symbols = %d\n", m_vopmd.iVLCSymbols = m_pbitstrmIn -> getBits (8));