/// <summary>
/// Saves the changes made in the current instance to the
/// file it represents.
/// </summary>
public override void Save()
{
Mode = AccessMode.Write;
try {
HeaderObject header = new HeaderObject(this, 0);
if (asf_tag == null)
{
header.RemoveContentDescriptors();
TagTypesOnDisk &= ~TagTypes.Asf;
}
else
{
TagTypesOnDisk |= TagTypes.Asf;
header.AddUniqueObject(
asf_tag.ContentDescriptionObject);
header.AddUniqueObject(
asf_tag.ExtendedContentDescriptionObject);
header.Extension.AddUniqueObject(
asf_tag.MetadataLibraryObject);
}
ByteVector output = header.Render();
long diff = output.Count - (long)header.OriginalSize;
Insert(output, 0, (long)header.OriginalSize);
InvariantStartPosition += diff;
InvariantEndPosition += diff;
} finally {
Mode = AccessMode.Closed;
}
}
/// <summary>
/// Reads the contents of the current instance.
/// </summary>
/// <param name="propertiesStyle">
/// A <see cref="ReadStyle" /> value specifying at what level
/// of accuracy to read the media properties, or <see
/// cref="ReadStyle.None" /> to ignore the properties.
/// </param>
private void Read(ReadStyle propertiesStyle)
{
Mode = AccessMode.Read;
try {
HeaderObject header = new HeaderObject(this, 0);
if (header.HasContentDescriptors)
{
TagTypesOnDisk |= TagTypes.Asf;
}
asf_tag = new Asf.Tag(header);
InvariantStartPosition = (long)header.OriginalSize;
InvariantEndPosition = Length;
if (propertiesStyle != ReadStyle.None)
{
properties = header.Properties;
}
} finally {
Mode = AccessMode.Closed;
}
}