// Create a box by reading the file and add it to "parent".
public static Mpeg4Box Create(Mpeg4File file, long position, Mpeg4Box parent)
{
// Read the box header.
Mpeg4BoxHeader header = new Mpeg4BoxHeader(file, position);
// If we're not even valid, quit.
if (!header.IsValid)
{
return(null);
}
// IF we're in a SampleDescriptionBox and haven'type loaded all the
// entries, try loading an appropriate entry.
if (parent.BoxType == "stsd" && parent.Children.Count < ((Mpeg4IsoSampleDescriptionBox)parent).EntryCount)
{
Mpeg4IsoHandlerBox handler = parent.Handler;
if (handler != null && handler.HandlerType == "soun")
{
return(new Mpeg4IsoAudioSampleEntry(header, parent));
}
else
{
return(new Mpeg4IsoSampleEntry(header, parent));
}
}
//
// A bunch of standard items.
//
if (header.BoxType == "moov")
{
return(new Mpeg4IsoMovieBox(header, parent));
}
if (header.BoxType == "mvhd")
{
return(new Mpeg4IsoMovieHeaderBox(header, parent));
}
if (header.BoxType == "mdia")
{
return(new Mpeg4IsoMediaBox(header, parent));
}
if (header.BoxType == "minf")
{
return(new Mpeg4IsoMediaInformationBox(header, parent));
}
if (header.BoxType == "stbl")
{
return(new Mpeg4IsoSampleTableBox(header, parent));
}
if (header.BoxType == "stsd")
{
return(new Mpeg4IsoSampleDescriptionBox(header, parent));
}
if (header.BoxType == "stco")
{
return(new Mpeg4IsoChunkOffsetBox(header, parent));
}
if (header.BoxType == "co64")
{
return(new Mpeg4IsoChunkLargeOffsetBox(header, parent));
}
if (header.BoxType == "trak")
{
return(new Mpeg4IsoTrackBox(header, parent));
}
if (header.BoxType == "hdlr")
{
return(new Mpeg4IsoHandlerBox(header, parent));
}
if (header.BoxType == "udta")
{
return(new Mpeg4IsoUserDataBox(header, parent));
}
if (header.BoxType == "meta")
{
return(new Mpeg4IsoMetaBox(header, parent));
}
if (header.BoxType == "ilst")
{
return(new Mpeg4AppleItemListBox(header, parent));
}
if (header.BoxType == "data")
{
return(new Mpeg4AppleDataBox(header, parent));
}
if (header.BoxType == "esds")
{
return(new Mpeg4AppleElementaryStreamDescriptor(header, parent));
}
if (header.BoxType == "free" || header.BoxType == "skip")
{
return(new Mpeg4IsoFreeSpaceBox(header, parent));
}
if (header.BoxType == "mean" || header.BoxType == "name")
{
return(new Mpeg4AppleAdditionalInfoBox(header, parent));
}
// If we still don'type have a tag, and we're inside an ItemLisBox, load
// lthe box as an AnnotationBox (Apple tag item).
if (parent.GetType() == typeof(Mpeg4AppleItemListBox))
{
return(new Mpeg4AppleAnnotationBox(header, parent));
}
// Nothing good. Go generic.
return(new Mpeg4UnknownBox(header, parent));
}
// 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);
}
