static EditListBox load32(Mp4Reader reader, int length)
{
Entry32[] entries = new Entry32[length];
var bytes = entries.AsSpan().asBytes();
reader.read(bytes);
Span <uint> integers = bytes.cast <uint>();
for (int i = 0; i < integers.Length; i++)
{
integers[i] = BinaryPrimitives.ReverseEndianness(integers[i]);
}
int rate = reader.readStructure <int>().endian();
return(new EditListBox(entries, rate));
}
public static iEditList create(EditListBox box, uint mediaScale, uint trackScale)
{
if (null == box || null == box.entries || box.entries.Length <= 0)
{
return(new Identity());
}
if (box.entries.Length > 1)
{
throw new NotSupportedException("The mp4 file has an edit list with more than 1 entry, this is not supported");
}
if (box.mediaRate != 0x10000)
{
throw new NotSupportedException($"The mp4 file has an edit list with a custom time scale { box.mediaRateDbl }, this is not supported");
}
Entry64 entry;
if (box.entries is Entry32[] list32)
{
Entry32 e = list32[0];
entry.mediaTime = e.mediaTime;
entry.segmentDuration = e.segmentDuration;
}
else if (box.entries is Entry64[] list64)
{
entry = list64[0];
}
else
{
throw new ApplicationException("Unknown entries type");
}
long offsetValue = -entry.mediaTime;
return(new Offset(offsetValue));
}