private MoovInfo?ReadMoovInfo()
{
var moovBox = FindBox(moov);
if (moovBox != null)
{
var moovData = new MoovInfo();
var tracks = new List <TrakInfo>();
var maxLen = moovBox.Value.BoxOffset + moovBox.Value.Offset;
BoxInfo?box = null;
do
{
box = NextBox(maxLen);
if (box != null)
{
if (box.Value.Type.Check(mvhd))
{
ReadMvhd(ref moovData);
}
if (box.Value.Type.Check(trak))
{
tracks.Add(ReadTrak(box.Value));
}
SeekNext(box.Value);
}
} while (!(box == null || box.Value.Last));
moovData.Tracks = tracks.ToArray();
return(moovData);
}
return(null);
}
private void ReadMvhd(ref MoovInfo moovData)
{
var v = new byte[1];
stream.Read(v, 1);
var isv8 = v[0] == 1;
stream.Seek(SeekOrigin.Current, 3 + (isv8 ? 8 + 8 : 4 + 4));
moovData.TimeUnitPerSecond = ReadUint32();
}
private void ReadChapters(MoovInfo moovBox)
{
var soundBox = moovBox.Tracks.Where(b => b.Type == "soun").ToArray();
if (soundBox.Length == 0)
{
return;
}
if (soundBox[0].Chaps != null && soundBox[0].Chaps.Length > 0)
{
var cb = new HashSet <uint>(soundBox[0].Chaps);
var textBox = moovBox.Tracks.Where(b => b.Type == "text" && cb.Contains(b.Id)).ToArray();
if (textBox.Length == 0)
{
return;
}
ReadChaptersText(textBox[0]);
}
}
