private void GetMotionVector(MotionField motionField, MacroblockPartition mbPart)
{
#if DEBUG
int dmvx = 0, dmvy = 0;
#endif
if (_arithmeticDecoder.DecodeDecision(40 + motionField.GetCtxIdxInc(_currMbAddr, mbPart, 0)) == 1)
{
uint dx = GetAbsMotionVectorComponent(40); // dx coordinate?
motionField.UpdateComponent(_currMbAddr, mbPart, 0, dx);
#if DEBUG
dmvx = (_arithmeticDecoder.DecodeBypass() == 1) ? -(int)dx : (int)dx; // sign?
#else
_arithmeticDecoder.DecodeBypass(); // sign
#endif
}
if (_arithmeticDecoder.DecodeDecision(47 + motionField.GetCtxIdxInc(_currMbAddr, mbPart, 1)) == 1)
{
uint dy = GetAbsMotionVectorComponent(47); // dy coordinate?
motionField.UpdateComponent(_currMbAddr, mbPart, 1, dy);
#if DEBUG
dmvy = (_arithmeticDecoder.DecodeBypass() == 1) ? -(int)dy : (int)dy; // sign?
#else
_arithmeticDecoder.DecodeBypass(); // sign
#endif
}
#if DEBUG
H264Debug.WriteLine(" dmv={0},{1}", dmvx, dmvy);
#endif
}
public CabacSliceData(INalUnitReader reader, IState readerState)
{
_reader = reader;
_readerState = readerState;
_sliceState = reader.State.SliceState;
_pictureState = _sliceState.PictureState;
_sequenceState = _pictureState.SequenceState;
_unavailableMacroblockState = _sliceState.IntraCoded
? MacroblockState.UnavailableIntraCoded
: MacroblockState.UnavailableInterCoded;
_macroblockStates = new MacroblockState[PicSizeInMbs];
_motionFieldL0 = IsList0Predicted ? new MotionField(_sliceState) : null;
_motionFieldL1 = IsList1Predicted ? new MotionField(_sliceState) : null;
_subMbTypes = new ISubMacroblockType[4];
_arithmeticDecoder = new ArithmeticDecoder(reader);
for (int i = 0; i < _macroblockStates.Length; i++)
{
_macroblockStates[i] = _unavailableMacroblockState;
}
MbToSliceGroupMap = _mbToSliceGroup.CreateMacroBlockToSliceGroupMap(_sliceState);
}