public void Read(BitReader bitReader)
{
if (_bEntropyCodingModeFlag)
ResidualBlock = ResidualBlockCABAC;
else
ResidualBlock = ResidualBlockCAVLC;
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader); // read-in the NALU
Header.Read(bitReader);
Data.Read(bitReader);
}
public void Read(BitReader bitReader)
{
if ((_mbLayer.MbPartPredMode(_mbType, 0) == MacroBlockPartitionMode.Intra_4x4) ||
(_mbLayer.MbPartPredMode(_mbType, 0) == MacroBlockPartitionMode.Intra_16x16))
{
if (_mbLayer.MbPartPredMode(_mbType, 0) == MacroBlockPartitionMode.Intra_4x4)
{
for (int luma4x4ids = 0; luma4x4ids < 16; luma4x4ids++)
{
PrevIntra4x4PredModeFlag[luma4x4ids] = bitReader.GetNextBit();
if (!PrevIntra4x4PredModeFlag[luma4x4ids])
{
RemIntra4x4PredMode[luma4x4ids] = bitReader.GetByteFromNBits(3);
}
}
}
IntraChromaPredMode = (byte)bitReader.DecodeUnsignedExpGolomb();
}
else if (_mbLayer.MbPartPredMode(_mbType, 0) != MacroBlockPartitionMode.Direct)
{
int numPart = (int)_mbLayer.NumMbPart(_mbType);
for (int mbPartIdx = 0; mbPartIdx < numPart; mbPartIdx++)
{
}
for (int mbPartIdx = 0; mbPartIdx < numPart; mbPartIdx++)
{
}
for (int mbPartIdx = 0; mbPartIdx < numPart; mbPartIdx++)
{
}
for (int mbPartIdx = 0; mbPartIdx < numPart; mbPartIdx++)
{
}
}
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
PrimaryPicType = (PictureType)bitReader.GetByteFromNBits(3);
bitReader.DiscardTrailingBits(); // complete the byte
while (MoreRBSPData(bitReader))
bitReader.ReadByte();
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
// FIXME: SliceData above is not complete, so for now let's just skip the rest of data
Nalu.SkipToEndOfNALU(bitReader);
Nalu.CheckSize(bitReader);
}
public int GetMBQPDelta(BitReader bitReader)
{
if (_pps.EntropyCodingModeFlag)
{
return 0; // FIXME: incomplete
}
else
{
return _bitReader.DecodeSignedExpGolomb();
}
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader); // read-in the NALU
Header.Read(bitReader);
SliceID = bitReader.DecodeUnsignedExpGolomb(); // this is not in base class
Data.Read(bitReader);
// FIXME: SliceData above is not complete, so for now let's just skip the rest of data
Nalu.SkipToEndOfNALU(bitReader);
Nalu.CheckSize(bitReader);
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
Profile = bitReader.ReadByte();
Constraints = bitReader.ReadByte();
Level = bitReader.ReadByte();
gSPSID = bitReader.DecodeUnsignedExpGolomb();
gLog2MaxFrameNumMinus4 = bitReader.DecodeUnsignedExpGolomb();
gPicOrderCntType = bitReader.DecodeUnsignedExpGolomb();
if (gPicOrderCntType == 0)
gMaxPicOrderCntLsbMinus4 = bitReader.DecodeUnsignedExpGolomb();
else if (gPicOrderCntType == 1)
{
DeltaPicOrderAlwaysZero = bitReader.GetNextBit();
gOffsetForNonRefPic = bitReader.DecodeSignedExpGolomb();
gOffsetForTopToBottomField = bitReader.DecodeSignedExpGolomb();
gNumRefFramesInPicOrderCntCycle = bitReader.DecodeUnsignedExpGolomb();
gOffsetsForRefFrames = new int[gNumRefFramesInPicOrderCntCycle];
for (int i = 0; i < gNumRefFramesInPicOrderCntCycle; i++)
gOffsetsForRefFrames[i] = bitReader.DecodeSignedExpGolomb();
}
gNumRefFrames = bitReader.DecodeUnsignedExpGolomb();
GapsInFrameNumValueAllowed = bitReader.GetNextBit();
gPicWidthInMBsMinus1 = bitReader.DecodeUnsignedExpGolomb();
Width = gPicWidthInMBsMinus1 + 1;
gPicHeightInMBsMinus1 = bitReader.DecodeUnsignedExpGolomb();
Height = gPicHeightInMBsMinus1 + 1;
PicSizeInMBs = Height * Width;
FrameMBSOnly = bitReader.GetNextBit();
uint interlaceFactor = (FrameMBSOnly) ? 1U : 2U;
Width *= 16;
Height *= (16 * interlaceFactor);
if (!FrameMBSOnly)
MBAdaptiveFrameField = bitReader.GetNextBit();
Direct8x8Inference = bitReader.GetNextBit();
FrameCropping = bitReader.GetNextBit();
if (FrameCropping)
{
FrameCropLeftOffset = bitReader.DecodeUnsignedExpGolomb();
FrameCropRightOffset = bitReader.DecodeUnsignedExpGolomb();
FrameCropTopOffset = bitReader.DecodeUnsignedExpGolomb();
FrameCropBottomOffset = bitReader.DecodeUnsignedExpGolomb();
}
VUIParametersPresent = bitReader.GetNextBit();
if (VUIParametersPresent)
{
vuiParams = new VUIParams();
vuiParams.Read(bitReader);
}
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader); // read-in the NALU
// NOTE: this coded slice has no Header (it should remain null)
SliceID = bitReader.DecodeUnsignedExpGolomb();
if (_pps.RedundantPICCountPresentFlag)
RedundantPictureCount = bitReader.DecodeUnsignedExpGolomb();
Data.Read(bitReader);
// FIXME: SliceData above is not complete, so for now let's just skip the rest of data
Nalu.SkipToEndOfNALU(bitReader);
Nalu.CheckSize(bitReader);
}
public uint GetMacroBlockType(BitReader bitReader)
{
MainInit(bitReader);
if (_pps.EntropyCodingModeFlag)
switch (_header.SliceType)
{
case SliceTypes.SI:
maxBinIdxCtx_p = 0; // prefix
ctxIdxOffset_p = 0; // prefix
maxBinIdxCtx_s = 6; // suffix
ctxIdxOffset_s = 3; // suffix
return GetSIMacroBlockType();
case SliceTypes.I:
maxBinIdxCtx_p = 0; // prefix
ctxIdxOffset_p = 0; // prefix
maxBinIdxCtx_s = 6; // suffix only
ctxIdxOffset_s = 3; // suffix only
return GetIMacroBlockType();
case SliceTypes.P:
case SliceTypes.SP:
maxBinIdxCtx_p = 2; // prefix
ctxIdxOffset_p = 14; // prefix
maxBinIdxCtx_s = 5; // suffix
ctxIdxOffset_s = 17; // suffix
return GetPnSPMacroBlockType();
case SliceTypes.B:
maxBinIdxCtx_p = 3; // prefix
ctxIdxOffset_p = 27; // prefix
maxBinIdxCtx_s = 5; // suffix
ctxIdxOffset_s = 32; // suffix
return GetBMacroBlockType();
default:
throw new Exception("MacroBlockLayer: bad slice type"); ;
}
else
return _bitReader.DecodeUnsignedExpGolomb();
}
public bool MoreRBSPData(BitReader bitReader)
{
long end = _positionInStream + NumBytes - 1;
if (bitReader.Position < end)
return true;
return false;
}
public void Read(BitReader bitReader)
{
AspectRatioInfoPresent = bitReader.GetNextBit();
if (AspectRatioInfoPresent)
{
AspectRatio = bitReader.GetByteFromNBits(8);
if (AspectRatio == Extended_SAR)
{
SARWidth = (ushort)bitReader.GetUIntFromNBits(16);
SARHeight = (ushort)bitReader.GetUIntFromNBits(16);
}
}
OverscanInfoPresent = bitReader.GetNextBit();
if (OverscanInfoPresent)
OverscanAppropriate = bitReader.GetNextBit();
VideoSignalTypePresent = bitReader.GetNextBit();
if (VideoSignalTypePresent)
{
VideoFormat = bitReader.GetByteFromNBits(3);
VideoFullRange = bitReader.GetNextBit();
ColourDescriptionPresent = bitReader.GetNextBit();
if (ColourDescriptionPresent)
{
ColourPrimaries = bitReader.GetByteFromNBits(8);
TransferCharacteristics = bitReader.GetByteFromNBits(8);
MatrixCoefficients = bitReader.GetByteFromNBits(8);
}
}
ChromaLocInfoPresent = bitReader.GetNextBit();
if (ChromaLocInfoPresent)
{
ChromaSampleLocTypeTopField = bitReader.DecodeUnsignedExpGolomb();
ChromaSampleLocTypeBottomField = bitReader.DecodeUnsignedExpGolomb();
}
TimingInfoPresent = bitReader.GetNextBit();
if (TimingInfoPresent)
{
NumUnitsInTick = bitReader.GetUIntFromNBits(32);
TimeScale = bitReader.GetUIntFromNBits(32);
FixedFrameRate = bitReader.GetNextBit();
}
NALHRDParametersPresent = bitReader.GetNextBit();
if (NALHRDParametersPresent)
{
NalHRDParams = new HRDParams();
NalHRDParams.Read(bitReader);
}
VclHRDParametersPresent = bitReader.GetNextBit();
if (VclHRDParametersPresent)
{
VclHRDParams = new HRDParams();
VclHRDParams.Read(bitReader);
}
if (NALHRDParametersPresent || VclHRDParametersPresent)
LowDelayHRDFlag = bitReader.GetNextBit();
PicStructPresent = bitReader.GetNextBit();
BitstreamRestriction = bitReader.GetNextBit();
if (BitstreamRestriction)
{
MotionVectorsOverPicBoundaries = bitReader.GetNextBit();
MaxBytesPerPicDenom = bitReader.DecodeUnsignedExpGolomb();
MaxBitsPerMBDenom = bitReader.DecodeUnsignedExpGolomb();
Log2MaxMVLengthHorizontal = bitReader.DecodeUnsignedExpGolomb();
Log2MaxMVLengthVertical = bitReader.DecodeUnsignedExpGolomb();
NumReorderFrames = bitReader.DecodeUnsignedExpGolomb();
MaxDecFrameBuffering = bitReader.DecodeUnsignedExpGolomb();
}
if ((AspectRatio > 0) && (AspectRatio < 17))
{
AspectRatioX = vui_aspect_x[AspectRatio];
AspectRatioY = vui_aspect_y[AspectRatio];
}
// gWidth = (uint)(gWidth * ((double)vui_aspect_x[vuiParams.AspectRatio]) / ((double)vui_aspect_y[vuiParams.AspectRatio]));
}
public void Read(BitReader bitReader)
{
_bitReader = bitReader;
MBType = _mbTypeParser.GetMacroBlockType(_bitReader);
if (MBType > 48)
throw new Exception("MacroBlockLayer: bad macro block type");
I_MacroBlockType mbt = (I_MacroBlockType)MBType;
if (mbt == I_MacroBlockType.I_PCM)
{
while (!bitReader.ByteAligned)
{
if (bitReader.GetNextBit())
throw new Exception("MacroBlockLayer: bad alignment");
}
bitReader.Position += (long)(256 * ChromaFormatFactor); // skip data (don't need it)
}
else
{
byte mbtype = (byte)MBType;
if ((MbPartPredMode(mbtype, 0) != MacroBlockPartitionMode.Intra_4x4) &&
(MbPartPredMode(mbtype, 0) != MacroBlockPartitionMode.Intra_16x16) &&
(NumMbPart(mbtype) == 4))
{
SubMacroBlockPrediction smbp = new SubMacroBlockPrediction(mbtype);
}
else
{
MacroBlockPrediction mbpred = new MacroBlockPrediction(mbtype, this);
mbpred.Read(bitReader);
}
if (MbPartPredMode(mbtype, 0) != MacroBlockPartitionMode.Intra_16x16)
CodedBlockPattern = _cbp.GetCodedBlockPattern(bitReader);
if ((CodedBlockPatternLuma > 0) || (CodedBlockPatternChroma > 0) ||
(MbPartPredMode(mbtype, 0) == MacroBlockPartitionMode.Intra_16x16))
{
MBQPDelta = _mbQPD.GetMBQPDelta(bitReader);
ResidualData residual = new ResidualData(_pps.EntropyCodingModeFlag);
residual.Read(bitReader);
}
}
}
private void DecodedReferencePictureMarking(BitReader bitReader)
{
if (_nalu.NALUType == NALUnitType.IDRSlice)
{
NoOutputOfPriorPicsFlag = bitReader.GetNextBit();
LongTermReferenceFlag = bitReader.GetNextBit();
}
else
{
AdaptiveRefPicMarkingModeFlag = bitReader.GetNextBit();
if (AdaptiveRefPicMarkingModeFlag)
{
do
{
MemoryManagementControlOperation = bitReader.DecodeUnsignedExpGolomb();
if ((MemoryManagementControlOperation == 1) || (MemoryManagementControlOperation == 3))
DifferenceOfPicNumsMinus1 = bitReader.DecodeUnsignedExpGolomb();
if (MemoryManagementControlOperation == 2)
LongTermPicNum = bitReader.DecodeUnsignedExpGolomb();
if ((MemoryManagementControlOperation == 3) || (MemoryManagementControlOperation == 6))
LongTermFrameIdx = bitReader.DecodeUnsignedExpGolomb();
if (MemoryManagementControlOperation == 4)
MaxLongTermFrameIdxPlus1 = bitReader.DecodeUnsignedExpGolomb();
} while (MemoryManagementControlOperation != 0);
}
}
}
private void MainInit(BitReader bitReader)
{
_bitReader = bitReader;
if (_firstMacroBlock)
{
InitContextVariables(276);
InitDecodeEngine();
}
}
public void CheckSize(BitReader bitReader)
{
if (NumBytes != (uint)(bitReader.Position - _positionInStream))
throw new Exception("NALU: CheckSize NOT ok");
}
void ParseThreadProc(object buffer)
{
byte[] sliceBytes = buffer as byte[];
BitReader br = new BitReader(new MemoryStream(sliceBytes));
int totalSize = _totalSize;
int offset = 0;
int state = 0;
while (totalSize > 4)
{
int naluLen = (int)br.GetUIntFromNBits(32);
if (naluLen > totalSize)
{
throw new Exception("H264 parsing: wrong byte count encountered");
}
if (naluLen > 0)
{
byte b = br.PeekByte();
byte refIDC = (byte)(b >> 5);
NALUnitType naluType = (NALUnitType)(b & 0x1F);
switch (state)
{
case 0:
AccessUnitDelimiter aud = new AccessUnitDelimiter((uint)naluLen);
aud.Read(br);
state = 1;
break;
case 1:
// either SEI or SPS (if it's an SEI, don't change state)
if (naluType == NALUnitType.SupplementalEnhancementInfo)
{
SupplementatlEnhancementMessage sei = new SupplementatlEnhancementMessage(_sps, (uint)naluLen);
sei.Read(br);
}
else if (naluType == NALUnitType.SequenceParamSet)
{
// replace _sps
_sps = new SequenceParameterSet((uint)naluLen);
_sps.Read(br);
}
else if (naluType == NALUnitType.PictureParamSet)
{
// replace _pps
_pps = new PictureParameterSet((uint)naluLen);
_pps.Read(br);
}
else if (naluType == NALUnitType.IDRSlice)
{
CodedSliceIDR idr = new CodedSliceIDR(_sps, _pps, (uint)naluLen);
idr.Read(br);
SliceType = idr.Header.SliceType;
FrameNum = idr.Header.FrameNum;
state = 2; // next should be zero or more redundant coded pictures
}
else if (naluType == NALUnitType.NonIDRSlice)
{
CodedSliceNonIDR nonIdr = new CodedSliceNonIDR(_sps, _pps, GetIDC(refIDC), (uint)naluLen);
nonIdr.Read(br);
SliceType = nonIdr.Header.SliceType;
FrameNum = nonIdr.Header.FrameNum;
state = 2; // next should be zero or more redundant coded pictures
}
else if (naluType == NALUnitType.SlicePartitionA)
{
CodedSlicePartitionA partA = new CodedSlicePartitionA(_sps, _pps, GetIDC(refIDC), (uint)naluLen);
partA.Read(br);
SliceType = partA.Header.SliceType;
FrameNum = partA.Header.FrameNum;
state = 2; // next should be zero or more redundant coded pictures
}
else if ((naluType == NALUnitType.SlicePartitionB) || (naluType == NALUnitType.SlicePartitionC))
{
CodedSlicePartitionBorC partBC = new CodedSlicePartitionBorC(_sps, _pps, GetIDC(refIDC), naluType, (uint)naluLen);
partBC.Read(br);
// FIXME: check that SliceType and FrameNum are set at this point
state = 2; // next should be zero or more redundant coded pictures
}
break;
case 2:
// either coded picture or end of sequence
break;
default:
break;
}
offset += naluLen;
totalSize -= (naluLen + 4);
}
else
{
naluLen = 0; // debugging break point
}
}
if (SampleDoneEvent != null)
{
SampleDoneEvent(this);
}
}
public virtual void Read(BitReader bitReader)
{
Nalu.Read(bitReader);
}
public void Read(BitReader bitReader)
{
if (_pps.EntropyCodingModeFlag)
{
while (!bitReader.ByteAligned)
{
if ((CABACAlignmentOneBit = bitReader.GetNextBit()) == false)
{
throw new Exception("Invalid entropy coding start for slice data");
}
}
}
CurrMbAddr = _header.FirstMBInSlice * (1u + (_header.MBaffFrameFlag ? 1u : 0u));
moreDataFlag = true;
prevMbSkipped = false;
do
{
if ((_header.SliceType != SliceTypes.I) && (_header.SliceType != SliceTypes.SI))
{
if (!_pps.EntropyCodingModeFlag)
{
MBSkipRun = bitReader.DecodeUnsignedExpGolomb();
prevMbSkipped = (MBSkipRun > 0);
for (int i = 0; i < MBSkipRun; i++)
{
CurrMbAddr = NextMBAddress(CurrMbAddr);
}
moreDataFlag = _nalu.MoreRBSPData(bitReader);
}
else
{
mbSkipFlag = false; // FIXME: CABAC value bitReader.GetNextBit();
moreDataFlag = !mbSkipFlag;
}
}
if (moreDataFlag)
{
if (_header.MBaffFrameFlag && (CurrMbAddr % 2 == 0 || (CurrMbAddr % 2 == 1 && prevMbSkipped)))
{
mbFieldDecodingFlag = false; // FIXME: CABAC value bitReader.GetNextBit();
}
MacroBlockLayer mbLayer = new MacroBlockLayer(_sps, _pps, _header, this);
mbLayer.Read(bitReader);
}
if (!_pps.EntropyCodingModeFlag)
{
moreDataFlag = _nalu.MoreRBSPData(bitReader);
}
else
{
if (_header.SliceType != SliceTypes.I && _header.SliceType != SliceTypes.SI)
{
prevMbSkipped = mbSkipFlag;
}
if (_header.MBaffFrameFlag && CurrMbAddr % 2 == 0)
{
moreDataFlag = true;
}
else
{
endOfSliceFlag = bitReader.GetNextBit(); // FIXME: random bit bec. residual is not read
moreDataFlag = !endOfSliceFlag;
}
}
CurrMbAddr = NextMBAddress(CurrMbAddr);
} while (moreDataFlag);
}
private void ReferencePictureListReordering(BitReader bitReader)
{
if ((SliceType != SliceTypes.I) && (SliceType != SliceTypes.SI))
{
RefPicListReorderingFlagI0 = bitReader.GetNextBit();
if (RefPicListReorderingFlagI0)
do
{
ReorderingOfPicNumsIDC = bitReader.DecodeUnsignedExpGolomb();
if (ReorderingOfPicNumsIDC > 3)
throw new Exception("SliceHeader: ReferencePictureListReordering 1, invalid pic nums IDC");
if ((ReorderingOfPicNumsIDC == 0) || (ReorderingOfPicNumsIDC == 1))
AbsDiffPicNumMinus1 = bitReader.DecodeUnsignedExpGolomb();
else if (ReorderingOfPicNumsIDC == 2)
LongTermPicNum = bitReader.DecodeUnsignedExpGolomb();
} while (ReorderingOfPicNumsIDC != 3);
}
if (SliceType == SliceTypes.B)
{
RefPicListReorderingFlagI1 = bitReader.GetNextBit();
if (RefPicListReorderingFlagI1)
do
{
ReorderingOfPicNumsIDC = bitReader.DecodeUnsignedExpGolomb();
if (ReorderingOfPicNumsIDC > 3)
throw new Exception("SliceHeader: ReferencePictureListReordering 2, invalid pic nums IDC");
if ((ReorderingOfPicNumsIDC == 0) || (ReorderingOfPicNumsIDC == 1))
AbsDiffPicNumMinus1 = bitReader.DecodeUnsignedExpGolomb();
else if (ReorderingOfPicNumsIDC == 2)
LongTermPicNum = bitReader.DecodeUnsignedExpGolomb();
} while (ReorderingOfPicNumsIDC != 3);
}
}
private SliceTypes ReadSliceType(BitReader bitReader)
{
uint st = bitReader.DecodeUnsignedExpGolomb();
if (st > 4)
{
if (_pps.SliceTypeVal == st)
_pps.SameCount++;
else
{
_pps.SliceTypeVal = st;
_pps.SameCount = 0;
}
st = st - 5;
}
else
{
if ((_pps.SliceTypeVal > 4) && (st == (_pps.SliceTypeVal - 5)))
_pps.SameCount++;
else
_pps.SliceTypeVal = 0;
}
return (SliceTypes)st;
}
private void PredictionWeightTable(BitReader bitReader)
{
LumaLog2WeightDenominator = bitReader.DecodeUnsignedExpGolomb();
ChromaLog2WeightDenominator = bitReader.DecodeUnsignedExpGolomb();
uint cnt = (NumRefIdx10ActiveMinus1 + 1);
if (cnt > 0)
{
LumaWeightI0 = new int[cnt];
LumaOffsetI0 = new int[cnt];
ChromaWeightI0 = new int[cnt][];
ChromaOffsetI0 = new int[cnt][];
for (int i = 0; i < cnt; i++)
{
LumaWeightI0Flag = bitReader.GetNextBit();
if (LumaWeightI0Flag)
{
LumaWeightI0[i] = bitReader.DecodeSignedExpGolomb();
LumaOffsetI0[i] = bitReader.DecodeSignedExpGolomb();
}
ChromaWeightI0Flag = bitReader.GetNextBit();
if (ChromaWeightI0Flag)
{
ChromaWeightI0[i] = new int[2];
ChromaOffsetI0[i] = new int[2];
for (int j = 0; j < 2; j++)
{
ChromaWeightI0[i][j] = bitReader.DecodeSignedExpGolomb();
ChromaOffsetI0[i][j] = bitReader.DecodeSignedExpGolomb();
}
}
}
}
if (SliceType == SliceTypes.B)
{
cnt = (NumRefIdx11ActiveMinus1 + 1);
if (cnt > 0)
{
LumaWeightI1 = new int[cnt];
LumaOffsetI1 = new int[cnt];
ChromaWeightI1 = new int[cnt][];
ChromaOffsetI1 = new int[cnt][];
for (int i = 0; i < cnt; i++)
{
LumaWeightI1Flag = bitReader.GetNextBit();
if (LumaWeightI1Flag)
{
LumaWeightI1[i] = bitReader.DecodeSignedExpGolomb();
LumaOffsetI1[i] = bitReader.DecodeSignedExpGolomb();
}
ChromaWeightI1Flag = bitReader.GetNextBit();
if (ChromaWeightI1Flag)
{
ChromaWeightI1[i] = new int[2];
ChromaOffsetI1[i] = new int[2];
for (int j = 0; j < 2; j++)
{
ChromaWeightI1[i][j] = bitReader.DecodeSignedExpGolomb();
ChromaOffsetI1[i][j] = bitReader.DecodeSignedExpGolomb();
}
}
}
}
}
}
// start reading at a byte boundary
public virtual void Read(BitReader bitReader)
{
_positionInStream = bitReader.Position;
Byte firstByte = bitReader.ReadByte();
Byte idc = (Byte)(firstByte >> 5);
if ((idc > 0) != (NALRefIDC > 0)) // if it's not as expected, then throw exception
throw new Exception("NALU base class: unexpected Ref IDC");
NALUnitType naluType = (NALUnitType)(firstByte & 0x1F);
if (naluType != NALUType)
throw new Exception("NALU base class: unexpected NALU type");
}
public void SkipToEndOfNALU(BitReader bitReader)
{
bitReader.Position = _positionInStream + NumBytes;
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
_bitReader = bitReader;
do
{
SEIMessage(bitReader);
} while (MoreRBSPData(bitReader));
SkipToEndOfNALU(bitReader);
}
public virtual void Read(BitReader bitReader)
{
Nalu.Read(bitReader);
}
public void Read(BitReader bitReader)
{
if (_pps.EntropyCodingModeFlag)
{
while (!bitReader.ByteAligned)
if ((CABACAlignmentOneBit = bitReader.GetNextBit()) == false)
throw new Exception("Invalid entropy coding start for slice data");
}
CurrMbAddr = _header.FirstMBInSlice * (1u + (_header.MBaffFrameFlag ? 1u : 0u));
moreDataFlag = true;
prevMbSkipped = false;
do
{
if ((_header.SliceType != SliceTypes.I) && (_header.SliceType != SliceTypes.SI))
{
if (!_pps.EntropyCodingModeFlag)
{
MBSkipRun = bitReader.DecodeUnsignedExpGolomb();
prevMbSkipped = (MBSkipRun > 0);
for (int i = 0; i < MBSkipRun; i++)
{
CurrMbAddr = NextMBAddress(CurrMbAddr);
}
moreDataFlag = _nalu.MoreRBSPData(bitReader);
}
else
{
mbSkipFlag = false; // FIXME: CABAC value bitReader.GetNextBit();
moreDataFlag = !mbSkipFlag;
}
}
if (moreDataFlag)
{
if (_header.MBaffFrameFlag && (CurrMbAddr % 2 == 0 || (CurrMbAddr % 2 == 1 && prevMbSkipped)))
{
mbFieldDecodingFlag = false; // FIXME: CABAC value bitReader.GetNextBit();
}
MacroBlockLayer mbLayer = new MacroBlockLayer(_sps, _pps, _header, this);
mbLayer.Read(bitReader);
}
if (!_pps.EntropyCodingModeFlag)
moreDataFlag = _nalu.MoreRBSPData(bitReader);
else
{
if (_header.SliceType != SliceTypes.I && _header.SliceType != SliceTypes.SI)
prevMbSkipped = mbSkipFlag;
if (_header.MBaffFrameFlag && CurrMbAddr % 2 == 0)
moreDataFlag = true;
else
{
endOfSliceFlag = bitReader.GetNextBit(); // FIXME: random bit bec. residual is not read
moreDataFlag = !endOfSliceFlag;
}
}
CurrMbAddr = NextMBAddress(CurrMbAddr);
} while (moreDataFlag);
}
public void Read(BitReader bitReader)
{
}
public void Read(BitReader bitReader)
{
FirstMBInSlice = bitReader.DecodeUnsignedExpGolomb();
SliceType = ReadSliceType(bitReader);
PICParameterSetID = bitReader.DecodeUnsignedExpGolomb();
FrameNum = bitReader.GetUIntFromNBits(_frameNumBits);
if (!_sps.FrameMBSOnly)
{
FieldPicFlag = bitReader.GetNextBit();
if (FieldPicFlag)
BottomFieldFlag = bitReader.GetNextBit();
}
if (_nalu.NALUType == NALUnitType.IDRSlice)
{
IDRPictureID = bitReader.DecodeUnsignedExpGolomb();
PrevRefFrameNum = 0;
}
if (_sps.gPicOrderCntType == 0)
{
PictureOrderCountLSB = bitReader.GetUIntFromNBits((ushort)(_sps.gMaxPicOrderCntLsbMinus4 + 4u));
if (_pps.PICOrderPresentFlag && !FieldPicFlag)
DeltaPictureOrderCountBottom = bitReader.DecodeSignedExpGolomb();
}
if ((_sps.gPicOrderCntType == 1) && !_sps.DeltaPicOrderAlwaysZero)
{
DeltaPictureOrderCount = new int[2];
DeltaPictureOrderCount[0] = bitReader.DecodeSignedExpGolomb();
if (_pps.PICOrderPresentFlag && !FieldPicFlag)
DeltaPictureOrderCount[1] = bitReader.DecodeSignedExpGolomb();
}
if (_pps.RedundantPICCountPresentFlag)
RedundantPictureCount = bitReader.DecodeUnsignedExpGolomb();
if (SliceType == SliceTypes.B)
DirectSpatialMVPredFlag = bitReader.GetNextBit();
if ((SliceType == SliceTypes.P) || (SliceType == SliceTypes.SP) || (SliceType == SliceTypes.B))
{
NumRefIdxActiveOverrideFlag = bitReader.GetNextBit();
if (NumRefIdxActiveOverrideFlag)
{
NumRefIdx10ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
if (SliceType == SliceTypes.B)
NumRefIdx11ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
}
}
ReferencePictureListReordering(bitReader);
if ((_pps.WeightedPredFlag && ((SliceType == SliceTypes.P) || (SliceType == SliceTypes.SP))) ||
((_pps.WeightedBiPredIDC == 1) && (SliceType == SliceTypes.B)))
{
PredictionWeightTable(bitReader);
}
if (_nalu.NALRefIDC != 0)
DecodedReferencePictureMarking(bitReader);
if (_pps.EntropyCodingModeFlag && (SliceType != SliceTypes.I) && (SliceType != SliceTypes.SI))
{
uint initIdc = bitReader.DecodeUnsignedExpGolomb();
if (initIdc < 4)
CABACInitIDC = (byte)initIdc;
else
throw new Exception("SliceHeader: bad CABACInitIDC");
}
SliceQPDelta = bitReader.DecodeSignedExpGolomb();
SliceQPy = 26 + _pps.PICInitQPMinus26 + SliceQPDelta;
if ((SliceType == SliceTypes.SP) || (SliceType == SliceTypes.SI))
{
if (SliceType == SliceTypes.SP)
SP4SwitchFlag = bitReader.GetNextBit();
SliceQSDelta = bitReader.DecodeSignedExpGolomb();
SliceQSy = 26 + _pps.PICInitQSMinus26 + SliceQSDelta;
}
if (_pps.DeblockingFilterControlPresentFlag)
{
DisableDeblockingFilterIDC = bitReader.DecodeUnsignedExpGolomb();
if (DisableDeblockingFilterIDC != 1)
{
SliceAlphaC0OffsetDiv2 = bitReader.DecodeSignedExpGolomb();
SliceBetaOffsetDiv2 = bitReader.DecodeSignedExpGolomb();
}
}
if ((_pps.NumSliceGroupsMinus1 > 0) && (_pps.SliceGroupMapType >= 3) && (_pps.SliceGroupMapType <= 5))
SliceGroupChangeCycle = bitReader.GetUIntFromNBits(BitReader.CalcBitsNeededToRepresent(_pps.NumSliceGroupsMinus1 + 1));
// once the header is read, we can derive the MacroBlock to SliceGroup mapping (Section 8.2.2 of H264 Spec)
if (_pps.NumSliceGroupsMinus1 > 0)
MbToSliceGroupMap = DeriveMB2SliceGroupMap();
}
private void SEIMessage(BitReader bitReader)
{
byte lastTypeByte;
PayloadType = 0;
while (0xFF == (lastTypeByte = bitReader.ReadByte()))
PayloadType += 255;
PayloadType += lastTypeByte;
byte lastSizeByte;
PayloadSize = 0;
while (0xFF == (lastSizeByte = bitReader.ReadByte()))
PayloadSize += 255;
PayloadSize += lastSizeByte;
SEIPayload();
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
PICParamSetID = bitReader.DecodeUnsignedExpGolomb();
SEQParamSetID = bitReader.DecodeUnsignedExpGolomb();
EntropyCodingModeFlag = bitReader.GetNextBit();
PICOrderPresentFlag = bitReader.GetNextBit();
NumSliceGroupsMinus1 = bitReader.DecodeUnsignedExpGolomb();
if (NumSliceGroupsMinus1 > 0)
{
SliceGroupMapType = bitReader.DecodeUnsignedExpGolomb();
switch (SliceGroupMapType)
{
case 0:
RunLengthMinus1 = new uint[NumSliceGroupsMinus1 + 1];
for (int grp = 0; grp <= NumSliceGroupsMinus1; grp++)
{
RunLengthMinus1[grp] = bitReader.DecodeUnsignedExpGolomb();
}
break;
case 1:
break;
case 2:
TopLeft = new uint[NumSliceGroupsMinus1 + 1];
BottomRight = new uint[NumSliceGroupsMinus1 + 1];
for (int grp = 0; grp <= NumSliceGroupsMinus1; grp++) // standards doc, this reads grp < NumSliceGroupsMinus1
{
TopLeft[grp] = bitReader.DecodeUnsignedExpGolomb();
BottomRight[grp] = bitReader.DecodeUnsignedExpGolomb();
}
break;
case 3:
case 4:
case 5:
SliceGroupChangeDirectionFlag = bitReader.GetNextBit();
SliceGroupChangeRateMinus1 = bitReader.DecodeUnsignedExpGolomb();
break;
case 6:
PICSizeInMapUnitsMinus1 = bitReader.DecodeUnsignedExpGolomb();
SliceGroupID = new uint[PICSizeInMapUnitsMinus1 + 1];
ushort bitCount = BitReader.CalcBitsNeededToRepresent(NumSliceGroupsMinus1 + 1);
for (int grp = 0; grp <= PICSizeInMapUnitsMinus1; grp++)
{
SliceGroupID[grp] = bitReader.GetUIntFromNBits(bitCount);
}
break;
default:
throw new Exception("BitReader: bad slice group map type");
}
}
NumRefIDx10ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
NumRefIDx11ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
WeightedPredFlag = bitReader.GetNextBit();
WeightedBiPredIDC = (ushort)bitReader.GetUIntFromNBits(2);
PICInitQPMinus26 = bitReader.DecodeSignedExpGolomb();
PICInitQSMinus26 = bitReader.DecodeSignedExpGolomb();
ChromaQPIndexOffset = bitReader.DecodeSignedExpGolomb();
DeblockingFilterControlPresentFlag = bitReader.GetNextBit();
ConstrainedIntraPredFlag = bitReader.GetNextBit();
RedundantPICCountPresentFlag = bitReader.GetNextBit();
bitReader.DiscardTrailingBits();
}
public uint GetCodedBlockPattern(BitReader bitReader)
{
return 0;
}
public override void Read(BitReader bitReader)
{
base.Read(bitReader);
PICParamSetID = bitReader.DecodeUnsignedExpGolomb();
SEQParamSetID = bitReader.DecodeUnsignedExpGolomb();
EntropyCodingModeFlag = bitReader.GetNextBit();
PICOrderPresentFlag = bitReader.GetNextBit();
NumSliceGroupsMinus1 = bitReader.DecodeUnsignedExpGolomb();
if (NumSliceGroupsMinus1 > 0)
{
SliceGroupMapType = bitReader.DecodeUnsignedExpGolomb();
switch (SliceGroupMapType)
{
case 0:
RunLengthMinus1 = new uint[NumSliceGroupsMinus1 + 1];
for (int grp = 0; grp <= NumSliceGroupsMinus1; grp++)
{
RunLengthMinus1[grp] = bitReader.DecodeUnsignedExpGolomb();
}
break;
case 1:
break;
case 2:
TopLeft = new uint[NumSliceGroupsMinus1 + 1];
BottomRight = new uint[NumSliceGroupsMinus1 + 1];
for (int grp = 0; grp <= NumSliceGroupsMinus1; grp++) // standards doc, this reads grp < NumSliceGroupsMinus1
{
TopLeft[grp] = bitReader.DecodeUnsignedExpGolomb();
BottomRight[grp] = bitReader.DecodeUnsignedExpGolomb();
}
break;
case 3:
case 4:
case 5:
SliceGroupChangeDirectionFlag = bitReader.GetNextBit();
SliceGroupChangeRateMinus1 = bitReader.DecodeUnsignedExpGolomb();
break;
case 6:
PICSizeInMapUnitsMinus1 = bitReader.DecodeUnsignedExpGolomb();
SliceGroupID = new uint[PICSizeInMapUnitsMinus1 + 1];
ushort bitCount = BitReader.CalcBitsNeededToRepresent(NumSliceGroupsMinus1 + 1);
for (int grp = 0; grp <= PICSizeInMapUnitsMinus1; grp++)
{
SliceGroupID[grp] = bitReader.GetUIntFromNBits(bitCount);
}
break;
default:
throw new Exception("BitReader: bad slice group map type");
}
}
NumRefIDx10ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
NumRefIDx11ActiveMinus1 = bitReader.DecodeUnsignedExpGolomb();
WeightedPredFlag = bitReader.GetNextBit();
WeightedBiPredIDC = (ushort)bitReader.GetUIntFromNBits(2);
PICInitQPMinus26 = bitReader.DecodeSignedExpGolomb();
PICInitQSMinus26 = bitReader.DecodeSignedExpGolomb();
ChromaQPIndexOffset = bitReader.DecodeSignedExpGolomb();
DeblockingFilterControlPresentFlag = bitReader.GetNextBit();
ConstrainedIntraPredFlag = bitReader.GetNextBit();
RedundantPICCountPresentFlag = bitReader.GetNextBit();
bitReader.DiscardTrailingBits();
}
