private static string ProcessAtomsButDumber(Memory <byte> buffer)
{
var cursor = 0;
while (cursor < buffer.Length)
{
var atom = new MP4Atom(buffer.Span.Slice(cursor));
cursor += Math.Max(4, atom.Size);
if (atom.Name == "ilst" || atom.Name == "?nam")
{
return(ProcessAtomsButDumber(atom.Buffer));
}
if (atom.Name == "data")
{
return(Encoding.UTF8.GetString(atom.Buffer.Slice(8).ToArray()));
}
}
return("");
}
private static IEnumerable <(string, string[])> ProcessAtoms(Memory <byte> buffer)
{
var cursor = 0;
var filename = default(string);
while (cursor < buffer.Length)
{
var atom = new MP4Atom(buffer.Span.Slice(cursor));
cursor += atom.Size;
if (atom.Name == "moov" || atom.Name == "udta")
{
foreach (var(fn, str) in ProcessAtoms(atom.Buffer))
{
yield return(fn, str);
}
continue;
}
if (atom.Name == "meta")
{
filename = ProcessAtomsButDumber(atom.Buffer);
}
if (atom.Name != "Xtra")
{
continue; // moov -> udta -> Xtra
}
if (atom.Buffer.Length < 0x1F)
{
Console.Out.WriteLine("\nReplay is f****d\n");
continue;
}
var localCursor = 0;
var blockSize = BinaryPrimitives.ReadInt32BigEndian(atom.Buffer.Span);
if (blockSize != atom.Buffer.Length)
{
Console.Out.WriteLine("\nReplay has a lot of data?\n");
}
localCursor += 4;
var blockNameLength = BinaryPrimitives.ReadInt32BigEndian(atom.Buffer.Span.Slice(localCursor));
if (blockNameLength == 0)
{
continue;
}
localCursor += 4;
var name = Encoding.ASCII.GetString(atom.Buffer.Span.Slice(localCursor, blockNameLength).ToArray());
localCursor += blockNameLength;
if (name != "WM/EncodingSettings")
{
Console.Out.WriteLine("\nReplay is f****d\n");
continue;
}
var settingCount = BinaryPrimitives.ReadInt32BigEndian(atom.Buffer.Span.Slice(localCursor));
localCursor += 4;
for (var i = 0; i < settingCount; ++i)
{
var encodedSettingLength = BinaryPrimitives.ReadInt32BigEndian(atom.Buffer.Span.Slice(localCursor));
if (encodedSettingLength == 0)
{
continue;
}
var type = BinaryPrimitives.ReadInt16BigEndian(atom.Buffer.Span.Slice(localCursor + 4));
if (type != 8)
{
Console.Out.WriteLine("\nNot Type 8?\n");
}
var data = atom.Buffer.Span.Slice(localCursor + 6, encodedSettingLength - 6);
var b64Str = Encoding.Unicode.GetString(data.ToArray());
localCursor += encodedSettingLength;
yield return(filename, b64Str.Split(':'));
}
}
}