/// <summary>
/// Returns whether the given <paramref name="headerStartCode"/> is known and allowed to
/// follow the <paramref name="mpeg4HeaderName"/> header.
/// </summary>
/// <param name="headerStartCode">the header start code field</param>
/// <param name="previousHeader">the header that lies before the <paramref name="headerStartCode"/></param>
/// <returns>true if it is a known header start code and allowed to follow <paramref name="headerStartCode"/>,
/// false otherwise</returns>
public static bool IsKnownHeaderStartCode(this uint headerStartCode, Mpeg4Header previousHeader)
{
bool shortVideoHeader = ((headerStartCode & 0xFC00) == 0x8000);
if (shortVideoHeader)
{
return(true);
}
HashSet <uint> allowedNextHeaders;
if (previousHeader != null && _allowedNextHeaders.TryGetValue(previousHeader.HeaderName, out allowedNextHeaders))
{
return(allowedNextHeaders.Contains(headerStartCode));
}
return(headerStartCode.IsKnownHeaderStartCode());
}
public override bool IsSuitableParent(Mpeg4Header parent)
{
if (base.IsSuitableParent(parent) == false)
{
return(false);
}
// A result can only contain H263 short video VOP's or VOP's and VOL's.
// Search the result for the type of headers in it.
Mpeg4Header header = Root.FindChildren(new Mpeg4HeaderName[] { Mpeg4HeaderName.Vop, Mpeg4HeaderName.VideoObjectLayer, Mpeg4HeaderName.VopWithShortHeader }, true);
if (header == null)
{
return(true);
}
return(header.HeaderName == Mpeg4HeaderName.VopWithShortHeader);
}
public Stuffing(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.Stuffing)
{
}
public VopWithShortHeader(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.VopWithShortHeader)
{
}
public VideoObjectLayer(Mpeg4Header previousHeader)
: this(previousHeader, false)
{
}
public VisualObject(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.VisualObject)
{
}
public VideoObjectLayer(Mpeg4Header previousHeader, bool inVop)
: base(previousHeader, Mpeg4HeaderName.VideoObjectLayer)
{
this.InVop = inVop;
}
public UserData(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.UserData)
{
}
public Vop(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.Vop)
{
}
public GroupOfVop(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.GroupOfVop)
{
}
public Extension(Mpeg4Header previousHeader)
: base(previousHeader, Mpeg4HeaderName.Extension)
{
}
