// Save the file.
public void Save()
{
if (listBox == null)
{
throw new TagLibException(TagLibError.Mpeg4TagSaveFailed);
}
//InvalidOperationException("Could not save AppleTag: listBox is not defined");
// Try to get into write mode.
try
{
file.Mode = FileAccessMode.Write;
}
catch (TagLibException)
{
return;
}
// Make a file box.
Mpeg4FileBox fileBox = new Mpeg4FileBox(file);
// Get the MovieBox.
Mpeg4IsoMovieBox moovBox = (Mpeg4IsoMovieBox)fileBox.FindChildDeep("moov");
// If we have a movie box...
if (moovBox != null)
{
// Set up how much, where, and what to replace, and who to tell
// about it.
ulong originalSize = 0;
long position = -1;
ByteVector data = null;
Mpeg4Box parent = null;
// Get the old ItemList (the one we're replacing.
Mpeg4AppleItemListBox old_ilst_box = (Mpeg4AppleItemListBox)moovBox.FindChildDeep("ilst");
// If it exists.
if (old_ilst_box != null)
{
// We stick ourself in the meta box and slate to overwrite it.
parent = old_ilst_box.Parent;
originalSize = parent.BoxSize;
position = parent.NextBoxPosition - (long)originalSize;
parent.ReplaceChild(old_ilst_box, listBox);
data = parent.Render();
parent = parent.Parent;
}
else
{
// There is not old ItemList. See if we can get a MetaBox.
Mpeg4IsoMetaBox metaBox = (Mpeg4IsoMetaBox)moovBox.FindChildDeep("meta");
//If we can...
if (metaBox != null)
{
// Stick the child in here and slate to overwrite...
metaBox.AddChild(listBox);
originalSize = metaBox.BoxSize;
position = metaBox.NextBoxPosition - (long)originalSize;
data = metaBox.Render();
parent = metaBox.Parent;
}
else
{
// There'field no MetaBox. Create one and add the ItemList.
metaBox = new Mpeg4IsoMetaBox("hdlr", null);
metaBox.AddChild(listBox);
// See if we can get a UserDataBox.
Mpeg4IsoUserDataBox udtaBox = (Mpeg4IsoUserDataBox)moovBox.FindChildDeep("udta");
// If we can...
if (udtaBox != null)
{
// We'll stick the MetaBox at the end and overwrite it.
originalSize = 0;
position = udtaBox.NextBoxPosition;
data = metaBox.Render();
parent = udtaBox;
}
else
{
// If not even the UserDataBox exists, create it and add
// our MetaBox.
udtaBox = new Mpeg4IsoUserDataBox();
udtaBox.AddChild(metaBox);
// Since UserDataBox is a child of MovieBox, we'll just
// insert it at the end.
originalSize = 0;
position = moovBox.NextBoxPosition;
data = udtaBox.Render();
parent = moovBox;
}
}
}
// If we have data and somewhere to put it..
if (data != null && position >= 0)
{
// Figure out the size difference.
long sizeDifference = (long)data.Count - (long)originalSize;
// Insert the new data.
file.Insert(data, position, (long)(originalSize));
// If there is a size difference, resize all parent headers.
if (sizeDifference != 0)
{
while (parent != null)
{
parent.OverwriteHeader(sizeDifference);
parent = parent.Parent;
}
// ALSO, VERY IMPORTANTLY, YOU MUST UPDATE EVERY 'stco'.
foreach (Mpeg4Box box in moovBox.Children)
{
if (box.BoxType == "trak")
{
Mpeg4IsoChunkLargeOffsetBox co64Box = (Mpeg4IsoChunkLargeOffsetBox)box.FindChildDeep("co64");
if (co64Box != null)
{
co64Box.UpdateOffset(sizeDifference);
}
Mpeg4IsoChunkOffsetBox stcoBox = (Mpeg4IsoChunkOffsetBox)box.FindChildDeep("stco");
if (stcoBox != null)
{
stcoBox.UpdateOffset((int)sizeDifference);
}
}
}
}
// Be nice and close the stream.
file.Mode = FileAccessMode.Closed;
return;
}
}
else
{
throw new TagLibException(TagLibError.Mpeg4StreamDoesNotHaveMoovTag);
}
//new ApplicationException("stream does not have MOOV tag");
// We're at the end. Close the stream and admit defeat.
file.Mode = FileAccessMode.Closed;
throw new TagLibException(TagLibError.Mpeg4CouldNotSaveAppleTag);
//ApplicationException("Could not complete AppleTag save");
}
// Read the file.
private void Read(ReadStyle propertiesStyle)
{
// Create a dummie outer box, as perscribed by the specs.
Mpeg4FileBox file_box = new Mpeg4FileBox(this);
// Find the movie box and item text. If the movie box doen'type exist, an
// exception will be thrown on the next call, but if there is no movie
// box, the file can'type possibly be valid.
Mpeg4IsoMovieBox moov_box = (Mpeg4IsoMovieBox)file_box.FindChildDeep("moov");
Mpeg4AppleItemListBox ilst_box = (Mpeg4AppleItemListBox)moov_box.FindChildDeep("ilst");
// If we have a ItemListBox, deparent it.
if (ilst_box != null)
{
ilst_box.RemoveFromParent();
}
// Create the tag.
tag = new Mpeg4AppleTag(ilst_box, this);
// If we're not reading properties, we're done.
if (propertiesStyle == ReadStyle.None)
{
return;
}
// Get the movie header box.
Mpeg4IsoMovieHeaderBox mvhd_box = (Mpeg4IsoMovieHeaderBox)moov_box.FindChildDeep("mvhd");
Mpeg4IsoAudioSampleEntry sample_entry = null;
// Find a TrackBox with a sound Handler.
foreach (Mpeg4Box box in moov_box.Children)
{
if (box.BoxType == "trak")
{
// If the handler isn'type sound, it could be metadata or video or
// any number of other things.
Mpeg4IsoHandlerBox hdlr_box = (Mpeg4IsoHandlerBox)box.FindChildDeep("hdlr");
if (hdlr_box == null || hdlr_box.HandlerType != "soun")
{
continue;
}
// This track SHOULD contain at least one sample entry.
sample_entry = (Mpeg4IsoAudioSampleEntry)box.FindChildDeep(typeof(Mpeg4IsoAudioSampleEntry));
break;
}
}
// If we have a MovieHeaderBox, deparent it.
if (mvhd_box != null)
{
mvhd_box.RemoveFromParent();
}
// If we have a SampleEntry, deparent it.
if (sample_entry != null)
{
sample_entry.RemoveFromParent();
}
// Read the properties.
properties = new Mpeg4Properties(mvhd_box, sample_entry, propertiesStyle);
}