private static object GetBoxAsObject(Stream stream, int size, MP4DataType type)
{
byte[] buffer = new byte[size];
if (stream.Read(buffer, 0, buffer.Length) != buffer.Length)
{
throw new MetaParseException("Unable to read full MP4 box content");
}
switch (type)
{
case MP4DataType.UInt8_a:
case MP4DataType.UInt8_b:
if (buffer.Length != 1)
{
throw new MetaParseException($"Box content type {type} require data to be a single byte. number of bytes: {buffer.Length}.");
}
return((int)buffer[0]);
case MP4DataType.Text:
if (buffer.Length == 0)
{
return(String.Empty);
}
byte[] text = buffer.TakeWhile(c => c != '\0').ToArray();
return(iso_8859_1.GetString(text));
default:
throw new NotImplementedException($"Unsupported box content type: {type}");
}
}
private static Dictionary <MP4Tag, object> ParseIlstChild(Stream stream, string type)
{
Dictionary <MP4Tag, object> tags = new Dictionary <MP4Tag, object>();
byte[] childHeader = new byte[8];
if (stream.Read(childHeader, 0, childHeader.Length) != childHeader.Length)
{
throw new MetaParseException($"Unable to read full MP4 \"ilst.{type}\" header");
}
int childSize = BitConverter.ToInt32(childHeader.Take(4).Reverse().ToArray(), 0);
if (childSize < 8)
{
return(tags);
}
childSize -= 8;
string childType = iso_8859_1.GetString(childHeader, 4, 4);
if (childType != "data")
{
throw new MetaParseException($"MP4 \"ilst.{type}\" must have a child of type \"data\", actual: \"{childType}\"");
}
byte[] childFlags = new byte[4];
if (stream.Read(childFlags, 0, childFlags.Length) != childFlags.Length)
{
throw new MetaParseException($"Unable to read full MP4 \"ilst.{type}.{childType}\" flags");
}
stream.Position += 4; // Ignore null bytes
childSize -= 8;
MP4DataType dataType = (MP4DataType)childFlags[3];
switch (type)
{
case "©alb":
tags[MP4Tag.Album] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©art":
tags[MP4Tag.Artist] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©cmt":
tags[MP4Tag.Comment] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©day":
tags[MP4Tag.Year] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©nam":
tags[MP4Tag.Title] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©gen":
case "gnre":
tags[MP4Tag.Genre] = GetBoxAsObject(stream, childSize, dataType);
break;
case "trkn":
tags[MP4Tag.TrackNumber] = GetBoxAsObject(stream, childSize, dataType);
break;
case "disk":
tags[MP4Tag.DiscNumber] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©wrt":
tags[MP4Tag.Composer] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©too":
tags[MP4Tag.Encoder] = GetBoxAsObject(stream, childSize, dataType);
break;
case "tmpo":
tags[MP4Tag.BPM] = GetBoxAsObject(stream, childSize, dataType);
break;
case "cprt":
tags[MP4Tag.Copyright] = GetBoxAsObject(stream, childSize, dataType);
break;
case "cpil":
tags[MP4Tag.Composer] = GetBoxAsObject(stream, childSize, dataType);
break;
case "©grp":
tags[MP4Tag.Grouping] = GetBoxAsObject(stream, childSize, dataType);
break;
case "catg":
tags[MP4Tag.Category] = GetBoxAsObject(stream, childSize, dataType);
break;
case "keyw":
tags[MP4Tag.Keyword] = GetBoxAsObject(stream, childSize, dataType);
break;
case "desc":
tags[MP4Tag.Description] = GetBoxAsObject(stream, childSize, dataType);
break;
default:
Trace.WriteLine($"[MP4Parser] ignoring ilst.{type}.{childType} data");
stream.Position += childSize;
break;
}
return(tags);
}
