/// <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>
/// Constructs and initializes a new instance of <see
/// cref="Tag" /> using the children of a <see
/// cref="HeaderObject" /> object.
/// </summary>
/// <param name="header">
/// A <see cref="HeaderObject" /> object whose children are
/// are to be used by the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="header" /> is <see langword="null" />.
/// </exception>
public Tag(HeaderObject header)
{
if (header == null)
{
throw new ArgumentNullException("header");
}
foreach (Object child in header.Children)
{
if (child is ContentDescriptionObject)
{
description =
child as ContentDescriptionObject;
}
if (child is ExtendedContentDescriptionObject)
{
ext_description =
child as ExtendedContentDescriptionObject;
}
}
foreach (Object child in header.Extension.Children)
{
if (child is MetadataLibraryObject)
{
metadata_library =
child as MetadataLibraryObject;
}
}
}
/// <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;
}
}
/// <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;
}
}
/// <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;
}
}