MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

using System.Diagnostics;

using System.Net;

using System.IO;

namespace ImageFields

{

    internal class MP4File : IDisposable

    {

        // Fields

        private BinaryWriter binaryWriter;

        private FileStream fileStream;

        private List<OffsetTime> offsetTimes;

        // Methods

        public MP4File(string fileName)

        {

            this.fileStream = new FileStream(fileName, FileMode.Create);

            this.binaryWriter = new BinaryWriter(this.fileStream);

            this.offsetTimes = new List<OffsetTime>();

            this.WriteInt32(0x18);

            this.WriteFourCC("ftyp");

            this.WriteFourCC("iso2");

            this.WriteInt32(0);

            this.WriteFourCC("isom");

            this.WriteFourCC("msas");

            this.WriteInt32(8);

            this.WriteFourCC("moov");

        }

        public void Close()

        {

            this.Dispose();

        }

        public void Dispose()

        {

            if (this.fileStream != null)

            {

                this.WriteInt32(0x30 + (0x13 * this.offsetTimes.Count));

                this.WriteFourCC("mfra");

                this.WriteInt32(0x18 + (0x13 * this.offsetTimes.Count));

                this.WriteFourCC("tfra");

                this.binaryWriter.Write((byte)1);

                this.binaryWriter.Write((byte)0);

                this.binaryWriter.Write((byte)0);

                this.binaryWriter.Write((byte)0);

                this.WriteInt32(1);

                this.WriteInt32(0);

                this.WriteInt32(this.offsetTimes.Count);

                for (int i = 0; i < this.offsetTimes.Count; i++)

                {

                    this.WriteInt64(this.offsetTimes[i].Time);

                    this.WriteInt64(this.offsetTimes[i].Offset);

                    this.binaryWriter.Write((byte)1);

                    this.binaryWriter.Write((byte)1);

                    this.binaryWriter.Write((byte)1);

                }

                this.WriteInt32(0x10);

                this.WriteFourCC("mfro");

                this.WriteInt32(0);

                this.WriteInt32(0x30 + (0x13 * this.offsetTimes.Count));

                this.binaryWriter.Close();

                this.fileStream.Close();

                this.offsetTimes = null;

                this.binaryWriter = null;

                this.fileStream = null;

                GC.SuppressFinalize(this);

            }

        }

        ~MP4File()

        {

            this.Dispose();

        }

        private void WriteFourCC(string s)

        {

            this.binaryWriter.Write(s[0]);

            this.binaryWriter.Write(s[1]);

            this.binaryWriter.Write(s[2]);

            this.binaryWriter.Write(s[3]);

        }

        private void WriteInt32(int i)

        {

            this.binaryWriter.Write(IPAddress.HostToNetworkOrder(i));

        }

        private void WriteInt64(long i)

        {

            this.binaryWriter.Write(IPAddress.HostToNetworkOrder(i));

        }

        public void WriteMP4Fragment(byte[] bytes, long time)

        {

            if (this.offsetTimes.Count > 0)

            {

                Debug.Assert(this.offsetTimes[this.offsetTimes.Count - 1].Time < time, "Times are out of order in MP4 file, will not work with IIS Smooth Streaming");

            }

            OffsetTime item = new OffsetTime

            {

                Offset = this.binaryWriter.BaseStream.Position,

                Time = time

            };

            this.offsetTimes.Add(item);

            this.WriteInt32(0x40);

            this.WriteFourCC("moof");

            this.WriteInt32(0x10);

            this.WriteFourCC("mfhd");

            this.WriteInt32(0);

            this.WriteInt32(this.offsetTimes.Count);

            this.WriteInt32(40);

            this.WriteFourCC("traf");

            this.WriteInt32(0x10);

            this.WriteFourCC("tfhd");

            this.WriteInt32(0);

            this.WriteInt32(1);

            this.WriteInt32(0x10);

            this.WriteFourCC("trun");

            this.WriteInt32(0);

            this.WriteInt32(1);

            this.WriteInt32(8 + bytes.Length);

            this.WriteFourCC("mdat");

            this.binaryWriter.Write(bytes);

            this.binaryWriter.Flush();

        }

        // Nested Types

        [StructLayout(LayoutKind.Sequential)]

        internal struct OffsetTime

        {

            public long Offset;

            public long Time;

        }

    }

}