/// <summary>
/// Gets the chunk attributes for the given <paramref name="chunkName"/>
/// using the information from the given <paramref name="attribute"/>.
/// This adds the chunk to the list of container chunks if-and-only-if the
/// chunk is a container chunk.
/// </summary>
/// <param name="chunkName">the chunk name</param>
/// <param name="attribute">the attribute for the given chunk name</param>
/// <param name="allContainerChunks">the list of all container chunks</param>
/// <returns>the chunk attributes</returns>
private static ChunkAttributes GetChunkAttributes(AviChunkName chunkName, AviAttribute attribute, ICollection <AviChunkName> allContainerChunks)
{
// Retrieve list of chunk types (4CC)
List <uint> chunkTypes = new List <uint>();
if (attribute.ChunkType != null)
{
foreach (string chunkType in attribute.ChunkType.Split("|".ToCharArray()))
{
chunkTypes.Add(chunkType.To4CC());
}
}
// Retrieve suitable parents, all container chunks if empty list
ICollection <AviChunkName> suitableParents = attribute.SuitableParents;
if (suitableParents.Count == 0)
{
suitableParents = allContainerChunks;
}
//// Update list of all container chunks
if ((attribute.ChunkFlags & ChunkFlags.ContainerChunk) == ChunkFlags.ContainerChunk)
{
allContainerChunks.Add(chunkName);
}
return(new ChunkAttributes(chunkTypes.AsReadOnly(), attribute.ChunkFlags, suitableParents));
}
/// <summary>
/// Gets the chunk type flags for the given <paramref name="chunkName"/>.
/// </summary>
/// <param name="chunkName">the chunk name</param>
/// <returns>the chunk flags</returns>
public static ChunkFlags GetChunkFlags(this AviChunkName chunkName)
{
return(ChunkAttributesForChunkName[chunkName].ChunkFlags);
}
/// <summary>
/// Returns whether the given <paramref name="chunkFlag"/> is set for
/// the given <paramref name="chunkName"/>.
/// </summary>
/// <param name="chunkName">the chunk name</param>
/// <param name="chunkFlag">the flag to test</param>
/// <returns>true if the flag is set, false otherwise</returns>
public static bool IsFlagSet(this AviChunkName chunkName, ChunkFlags chunkFlag)
{
return((chunkName.GetChunkFlags() & chunkFlag) == chunkFlag);
}
/// <summary>
/// Gets the suitable parents for the given <paramref name="chunkName"/>.
/// </summary>
/// <param name="chunkName">the chunk name</param>
/// <returns>the suitable parents</returns>
public static ICollection <AviChunkName> GetSuitableParents(this AviChunkName chunkName)
{
return(ChunkAttributesForChunkName[chunkName].SuitableParents);
}
/// <summary>
/// Returns whether the given <paramref name="chunkName"/> is a top-level chunk type.
/// Top-level chunks are only allowed in the root. For example, the Movie chunk.
/// </summary>
/// <param name="chunkName">the chunk name</param>
/// <returns>true if it is a top-level chunk type, false otherwise</returns>
public static bool IsTopLevel(this AviChunkName chunkName)
{
ICollection <AviChunkName> suitableParents = chunkName.GetSuitableParents();
return(suitableParents.Count == 1 && suitableParents.Contains(AviChunkName.Root));
}
