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 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; }