internal Colour(Stream stream)
{
ElementReader reader = new ElementReader(stream);
while (!reader.EOF)
{
eElement id = reader.readElementId();
switch (id)
{
case eElement.MatrixCoefficients:
matrixCoefficients = (eMatrixCoefficients)reader.readByte(2);
break;
case eElement.BitsPerChannel:
bitsPerChannel = reader.readUlong(0);
break;
case eElement.ChromaSubsamplingHorz:
chromaSubsamplingHorz = reader.readUlong();
break;
case eElement.ChromaSubsamplingVert:
chromaSubsamplingVert = reader.readUlong();
break;
case eElement.CbSubsamplingHorz:
cbSubsamplingHorz = reader.readUlong();
break;
case eElement.CbSubsamplingVert:
cbSubsamplingVert = reader.readUlong();
break;
case eElement.ChromaSitingHorz:
chromaSitingHorz = (eChromaSitingHorz)reader.readByte(0);
break;
case eElement.ChromaSitingVert:
chromaSitingVert = (eChromaSitingVert)reader.readByte(0);
break;
case eElement.Range:
range = (eRange)reader.readByte(0);
break;
case eElement.TransferCharacteristics:
transferCharacteristics = (eTransferCharacteristics)reader.readByte(2);
break;
case eElement.Primaries:
primaries = (ePrimaries)reader.readByte(2);
break;
case eElement.MaxCLL:
maxCLL = reader.readUlong();
break;
case eElement.MaxFALL:
maxFALL = reader.readUlong();
break;
case eElement.MasteringMetadata:
masteringMetadata = new MasteringMetadata(stream);
break;
default:
reader.skipElement();
break;
}
}
}
internal VideoUsabilityInfo(ref BitReader reader)
{
flags = default;
sampleAspectRatio = default;
// When the video_format syntax element is not present, video_format value shall be inferred to be equal to 5.
videoFormat = eVideoFormat.Unspecified;
colorPrimaries = eColorPrimaries.Unspecified;
transferCharacteristics = eTransferFunc.Unspecified;
matrixCoefficients = eMatrixCoefficients.Unspecified;
numUnitsInTick = timeScale = 0;
chromaLocationTop = chromaLocationBottom = 0;
hrd = default;
if (!reader.readBit())
{
return;
}
flags = eVuiFlags.VUI;
if (reader.readBit())
{
// aspect_ratio_info_present_flag
flags |= eVuiFlags.AspectRatio;
byte index = (byte)reader.readInt(8);
if (index < sSampleAspectRatio.predefined.Length)
{
sampleAspectRatio = sSampleAspectRatio.predefined[index];
}
else if (index == 0xFF)
{
checked
{
ushort w = (ushort)reader.readInt(16);
ushort h = (ushort)reader.readInt(16);
sampleAspectRatio = new sSampleAspectRatio(w, h);
}
}
else
{
throw new ArgumentException($"Unexpected sample aspect ratio index { index }; it must be < 14, or 0xFF for \"Extended_SAR\"");
}
}
if (reader.readBit())
{
// overscan_info_present_flag
flags |= eVuiFlags.OverscanPresent;
if (reader.readBit())
{
flags |= eVuiFlags.OverscanAppropriate;
}
}
if (reader.readBit())
{
// video_signal_type_present_flag
flags |= eVuiFlags.VideoSignal;
videoFormat = (eVideoFormat)reader.readInt(3);
if (reader.readBit())
{
flags |= eVuiFlags.VideoSignalFullRange;
}
if (reader.readBit()) // colour_description_present_flag
{
flags |= eVuiFlags.VideoSignalColorDesc;
colorPrimaries = (eColorPrimaries)reader.readInt(8);
transferCharacteristics = (eTransferFunc)reader.readInt(8);
matrixCoefficients = (eMatrixCoefficients)(byte)reader.readInt(8);
}
}
if (reader.readBit())
{
// chroma_loc_info_present_flag
flags |= eVuiFlags.ChromaLocation;
checked
{
chromaLocationTop = (byte)reader.unsignedGolomb();
chromaLocationBottom = (byte)reader.unsignedGolomb();
if (chromaLocationTop > 5 || chromaLocationBottom > 5)
{
throw new ArgumentException("Invalid chroma location values, must be in [ 0 .. 5 ] interval");
}
}
}
if (reader.readBit())
{
flags |= eVuiFlags.Timing;
numUnitsInTick = reader.readInt(32); //
timeScale = reader.readInt(32);
if (reader.readBit())
{
flags |= eVuiFlags.TimingFixedRate;
}
}
if (reader.readBit())
{
flags |= eVuiFlags.NalHrd;
hrd = new HRD(ref reader);
}
if (reader.readBit())
{
flags |= eVuiFlags.VclHrd;
hrd = new HRD(ref reader);
}
if (0 != (flags & (eVuiFlags.NalHrd | eVuiFlags.VclHrd)))
{
if (reader.readBit())
{
flags |= eVuiFlags.LowDelay;
}
}
if (reader.readBit())
{
flags |= eVuiFlags.PicStruct;
}
}
public static eYCbCrEncoding?map(this eMatrixCoefficients mc) => s_encoding.lookup(mc);
