public void AddExtension(ExtensionId extensionId)
{
if (!_extensions.Contains(extensionId))
{
_extensions.Add(extensionId);
}
}
public void Validate()
{
if (First.IsSpecified)
{
Preconditions.AtLeast(First, 1, nameof(First));
Preconditions.AtMost(First, 100, nameof(First));
}
if (After.IsSpecified)
{
Preconditions.NotNullOrWhitespace(After.ToString(), nameof(After));
}
if (ExtensionId.IsSpecified)
{
Preconditions.NotNullOrWhitespace(ExtensionId.ToString(), nameof(ExtensionId));
}
if (Type.IsSpecified)
{
Preconditions.NotNullOrWhitespace(Type.ToString(), nameof(Type));
}
}
private static bool CheckExtensionOccurance(IMpeg2VideoState state, ExtensionId extensionId)
{
if (extensionId == ExtensionId.SequenceExtensionId)
{
return(true);
}
if (extensionId == ExtensionId.PictureCodingExtensionId)
{
return(true);
}
// Extensions other than 'SequenceExtension' and 'PictureCodingExtension',
// which are the first extension to follow a sequence or picture header
// respectively in a valid MPEG-2 stream, can only occur after extension of
// the same type (sequence or picture). Duplicates are not allowed!
if (state.Picture.Initialized)
{
// No duplicates allowed!
if (state.Picture.HasExtension(extensionId))
{
return(false);
}
// FIXME: 'extensionId' must be a picture extension!!
// Last header must be a picture extension
return(IsPictureExtension(state.LastHeaderName));
}
else
{
// No duplicates allowed!
if (state.Sequence.HasExtension(extensionId))
{
return(false);
}
// FIXME: 'extensionId' must be a sequence extension!!
// Last header must be a sequence extension
return(IsSequenceExtension(state.LastHeaderName));
}
}
public bool HasExtension(ExtensionId extensionId)
{
return(_extensions.Contains(extensionId));
}
