/// <summary>
/// Adds the specified packet and automatically places it on the right track.
/// If the track requires sorting it does so by reordering packets based on their timestamp.
/// </summary>
/// <param name="item">The item.</param>
public void Add(ClosedCaptionPacket item)
{
CurrentNtscField = item.NtscField != 0 ? item.NtscField : 1;
CurrentChannel = item.Channel != 0 ? item.Channel : CurrentChannel;
var targetCC = CC1;
if (CurrentNtscField == 1)
{
if (CurrentChannel == 1)
{
targetCC = CC1;
}
else
{
targetCC = CC2;
}
}
else
{
if (CurrentChannel == 1)
{
targetCC = CC3;
}
else
{
targetCC = CC4;
}
}
var performSort = targetCC.Count != 0;
if (targetCC.Count > 0 && targetCC.Last().Timestamp.Ticks <= item.Timestamp.Ticks)
{
performSort = false;
}
targetCC.Add(item);
if (performSort)
{
targetCC.Sort();
}
}
/// <summary>
/// Determines whether a previous packet is a repeated control code.
/// This is according to CEA-608 Section D.2 Transmission of Control Code Pairs
/// </summary>
/// <param name="previousPacket">The previous packet.</param>
/// <returns>
/// <c>true</c> it is a repeated control code packet.
/// </returns>
public bool IsRepeatedControlCode(ClosedCaptionPacket previousPacket)
{
return(IsControlPacket && previousPacket.D0 == D0 && previousPacket.D1 == D1);
}
