public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
IPictureState pictureState = reader.State.Picture;
resultState.Name = Name;
// It can occur after the last slice of the previous picture or after a sequence header
// or group of pictures header, possible followed by user data and/or extensions.
if ((reader.State.LastHeaderName != Slice.Name) && pictureState.Initialized)
{
resultState.Invalidate();
return;
}
if (!reader.State.Sequence.Initialized && !reader.State.SeenGop)
{
reader.InsertReferenceHeaderBeforeStartCode();
}
pictureState.Reset();
reader.State.Slice.Reset();
reader.GetBits(10, Attribute.TemporalReference);
var pictureCodingType = (PictureCodingType)reader.GetBits(3, Attribute.PictureCodingType, _pictureCodingTypeResultFormatter);
pictureState.CodingType = pictureCodingType;
reader.GetBits(16, Attribute.VbvDelay);
if ((pictureCodingType == PictureCodingType.PType) || (pictureCodingType == PictureCodingType.BType))
{
reader.GetFlag(Attribute.FullPelForwardVector);
byte forwardFCode = (byte)reader.GetBits(3, Attribute.ForwardFCode);
pictureState.ForwardHorizontalFCode = forwardFCode;
pictureState.ForwardVerticalFCode = forwardFCode;
}
if (pictureCodingType == PictureCodingType.BType)
{
reader.GetFlag(Attribute.FullPelBackwardVector);
byte backwardFCode = (byte)reader.GetBits(3, Attribute.BackwardFCode);
pictureState.BackwardHorizontalFCode = backwardFCode;
pictureState.BackwardVerticalFCode = backwardFCode;
}
int count = 0; // Sanity check
uint maxExtraInformationLength = reader.State.Configuration.PictureHeaderMaxLengthOfExtraInformation;
while (reader.ShowBits(1) == 1)
{
reader.GetBits(1); // ExtraBitPicture
reader.GetBits(8); // ExtraInformationPicture
if (count++ > maxExtraInformationLength)
{
resultState.Invalidate();
return;
}
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
IMpeg2VideoState state = reader.State;
// It can occur after the last slice of a picture or after a sequence header, possible followed by user data and/or extensions
if ((state.LastHeaderName != Slice.Name) && (state.LastHeaderName != null) && (!state.Sequence.Initialized || state.SeenGop || state.Picture.Initialized))
{
resultState.Invalidate();
return;
}
if (!reader.State.Sequence.Initialized)
{
reader.InsertReferenceHeaderBeforeStartCode();
}
state.SeenGop = true;
state.Picture.Reset();
reader.GetAttribute(_timeCodeAttribute);
reader.GetFlag(Attribute.ClosedGop);
reader.GetFlag(Attribute.BrokenLink);
}