using System;

namespace Nikse.SubtitleEdit.Core.VobSub
{
    /// <summary>
    /// http://www.mpucoder.com/DVD/packhdr.html
    /// </summary>
    public class Mpeg2Header
    {
        public const int Length = 14;

        public readonly UInt32 StartCode;
        public readonly byte PackIndentifier;
        //public readonly UInt64 SystemClockReferenceQuotient;
        //public readonly UInt64 SystemClockReferenceRemainder;
        public readonly UInt64 ProgramMuxRate;
        public readonly int PackStuffingLength;

        public Mpeg2Header(byte[] buffer)
        {
            StartCode = Helper.GetEndian(buffer, 0, 3);
            PackIndentifier = buffer[3];

            //string b4To9AsBinary = Helper.GetBinaryString(buffer, 4, 6);
            //b4To9AsBinary = b4To9AsBinary.Substring(2,3) + b4To9AsBinary.Substring(6,15) + b4To9AsBinary.Substring(22,15);
            //SystemClockReferenceQuotient = Helper.GetUInt32FromBinaryString(b4To9AsBinary);

            //SystemClockReferenceRemainder = (ulong)(((buffer[8] & Helper.B00000011) << 8) + buffer[9])

            ProgramMuxRate = Helper.GetEndian(buffer, 10, 3) >> 2;

            PackStuffingLength = buffer[13] & Helper.B00000111;
        }

    }
}