public static int GetMpegStreamType(string path)
{
int mpegType = -1;
using (FileStream fs = File.OpenRead(path))
{
// look for first packet
long currentOffset = ParseFile.GetNextOffset(fs, 0, MpegStream.PacketStartBytes);
if (currentOffset != -1)
{
currentOffset += 4;
fs.Position = currentOffset;
byte idByte = (byte)fs.ReadByte();
if ((int)ByteConversion.GetHighNibble(idByte) == 2)
{
mpegType = 1;
}
else if ((int)ByteConversion.GetHighNibble(idByte) == 4)
{
mpegType = 2;
}
}
else
{
throw new FormatException(String.Format("Cannot find Pack Header for file: {0}{1}", Path.GetFileName(path), Environment.NewLine));
}
}
return(mpegType);
}
