public SequenceState(SequenceStateBuilder builder)
{
Id = builder._id;
ByteStreamFormat = builder.ByteStreamFormat;
Profile = builder.ProfileIdc;
ChromaFormat = builder.SeparateColourPlaneFlag ? ChromaFormat.SeparateColorPlane : ChromaFormats[builder.ChromaFormatIdc];
BitDepthLuma = builder.BitDepthLumaMinus8 + 8;
BitDepthChroma = builder.BitDepthChromaMinus8 + 8;
Log2MaxFrameNum = builder.Log2MaxFrameNumMinus4 + 4;
PictureOrderCountType = builder.PictureOrderCountType;
Log2MaxPicOrderCntLsb = builder.Log2MaxPicOrderCntLsbMinus4 + 4;
DeltaPicOrderAlwaysZeroFlag = builder.DeltaPicOrderAlwaysZeroFlag;
MaxNumRefFrames = builder.MaxNumRefFrames;
PicWidthInMbs = builder.PicWidthInMbsMinus1 + 1;
PicHeightInMapUnits = builder.PicHeightInMapUnitsMinus1 + 1;
FrameMbsOnlyFlag = builder.FrameMbsOnlyFlag;
MbAdaptiveFrameFieldFlag = builder.MbAdaptiveFrameFieldFlag;
Direct8X8InferenceFlag = builder.Direct8X8InferenceFlag;
int qbBdOffsetY = 6 * ((int)BitDepthLuma - 8);
MinMbQpDelta = -(26 + qbBdOffsetY / 2);
MaxMbQpDelta = (25 + qbBdOffsetY / 2);
}
// 7.3.2.1.1 SequenceState parameter set data syntax
public void Parse(INalUnitReader reader, IResultNodeState resultState)
{
// Constraints from 7.4.2.11
resultState.Name = Name;
Profile profileIdc = reader.GetBits(8, Attribute.ProfileIdc, _profileValidator);
reader.GetBits(6); // constraint_set{0-5}_flag
if (reader.GetBits(2) != 0) // reserved_zero_2bits
{
resultState.Invalidate();
return;
}
reader.GetByte(false, Attribute.LevelIdc, 59); // level_idc, Table A-1 - Level limits
uint sequenceParameterSetId = reader.GetExpGolombCoded(Attribute.SequenceParameterSetId, 31);
ISequenceStateBuilder builder = new SequenceStateBuilder(sequenceParameterSetId);
builder.ByteStreamFormat = reader.State.ByteStreamFormat;
builder.ProfileIdc = profileIdc;
if (IsHighProfile(profileIdc))
{
uint chromaFormatIdc = reader.GetExpGolombCoded(Attribute.ChromaFormatIdc, 3); // Table 6-1
builder.ChromaFormatIdc = chromaFormatIdc;
if (chromaFormatIdc == 3)
{
builder.SeparateColourPlaneFlag = reader.GetBit(Attribute.SeparateColorPlaneFlag);
}
builder.BitDepthLumaMinus8 = reader.GetExpGolombCoded(Attribute.BitDepthLumaArraySampleMinus8, 6);
builder.BitDepthChromaMinus8 = reader.GetExpGolombCoded(Attribute.BitDepthChromaArraySampleMinus8, 6);
reader.GetBit(); // qpprime_y_zero_transform_bypass_flag
if (reader.GetBit()) // seq_scaling_matrix_present_flag
{
for (int i = 0; i < ((chromaFormatIdc != 3) ? 8 : 12); i++)
{
if (reader.GetBit()) // seq_scaling_list_present_flag[i]
{
// FIXME: scaling_list() is not implemented!!
resultState.Invalidate();
return;
}
}
}
}
builder.Log2MaxFrameNumMinus4 = reader.GetExpGolombCoded(Attribute.Log2MaxFrameNumMinus4, 28);
DecodePictureOrderCount(reader, builder);
uint maxDpbFramesUpperLimit = (profileIdc == Profile.MultiviewHigh) ? 160U : 16U; //could use the exact maxDpbFrames, but this is easier
builder.MaxNumRefFrames = reader.GetExpGolombCoded(Attribute.MaxNumberReferenceFrames, maxDpbFramesUpperLimit);
reader.GetBit(); // gaps_in_frame_num_value_allowed_flag
builder.PicWidthInMbsMinus1 = reader.GetExpGolombCoded(Attribute.PictureWidthInMacroBlocksMinus1, 543);
builder.PicHeightInMapUnitsMinus1 = reader.GetExpGolombCoded(Attribute.PictureHeightInMapUnitsMinus1, 543);
var frameMbsOnlyFlag = reader.GetBit(Attribute.FrameMbsOnlyFlag);
builder.FrameMbsOnlyFlag = frameMbsOnlyFlag;
if (!frameMbsOnlyFlag)
{
builder.MbAdaptiveFrameFieldFlag = reader.GetBit();
}
bool direct8X8InferenceFlag = reader.GetBit();
builder.Direct8X8InferenceFlag = direct8X8InferenceFlag;
if (!frameMbsOnlyFlag && !direct8X8InferenceFlag)
{
resultState.Invalidate();
return;
}
if (reader.GetBit()) // frame_cropping_flag
{
// TODO: Cropping should not exceed the size of a frame!
reader.GetExpGolombCoded(Attribute.FrameCropLeftOffset, 8703);
reader.GetExpGolombCoded(Attribute.FrameCropRightOffset, 8703);
reader.GetExpGolombCoded(Attribute.FrameCropTopOffset, 8703);
reader.GetExpGolombCoded(Attribute.FrameCropBottomOffset, 8703);
}
if (reader.GetBit()) // vui_parameters_present_flag
{
GetVuiParameters(reader, resultState);
}
if (reader.ShowBits(1) == 1)
{
reader.GetBit(); // rbsp_stop_one_bit (equal to 1)
// trailing zero bits
}
if (resultState.Valid)
{
reader.State.SequenceStates[sequenceParameterSetId] = builder.Build();
}
}
