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IsoMovieHeaderBox.cs

//
// IsoMovieHeaderBox.cs: Provides an implementation of a ISO/IEC 14496-12
// MovieHeaderBox.
//
// Author:
//   Brian Nickel (brian.nickel@gmail.com)
//
// Copyright (C) 2006-2007 Brian Nickel
// 
// This library is free software; you can redistribute it and/or modify
// it  under the terms of the GNU Lesser General Public License version
// 2.1 as published by the Free Software Foundation.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
// USA
//

using System;

namespace TagLib.Mpeg4 {
      /// <summary>
      ///    This class extends <see cref="FullBox" /> to provide an
      ///    implementation of a ISO/IEC 14496-12 MovieHeaderBox.
      /// </summary>
00032       public class IsoMovieHeaderBox : FullBox
      {
            #region Private Fields
            
            /// <summary>
            ///    Contains the creation time of the movie.
            /// </summary>
00039             private ulong creation_time;
            
            /// <summary>
            ///    Contains the modification time of the movie.
            /// </summary>
00044             private ulong modification_time;
            
            /// <summary>
            ///    Contains the timescale.
            /// </summary>
00049             private uint timescale;
            
            /// <summary>
            ///    Contains the duration.
            /// </summary>
00054             private ulong  duration;
            
            /// <summary>
            ///    Contains the rate.
            /// </summary>
00059             private uint rate;
            
            /// <summary>
            ///    Contains the volume.
            /// </summary>
00064             private ushort volume;
            
            /// <summary>
            ///    Contains the next track ID.
            /// </summary>
00069             private uint next_track_id;
            
            #endregion
            
            
            
            #region Constructors
            
            /// <summary>
            ///    Constructs and initializes a new instance of <see
            ///    cref="IsoMovieHeaderBox" /> with a provided header and
            ///    handler by reading the contents from a specified file.
            /// </summary>
            /// <param name="header">
            ///    A <see cref="BoxHeader" /> object containing the header
            ///    to use for the new instance.
            /// </param>
            /// <param name="file">
            ///    A <see cref="TagLib.File" /> object to read the contents
            ///    of the box from.
            /// </param>
            /// <param name="handler">
            ///    A <see cref="IsoHandlerBox" /> object containing the
            ///    handler that applies to the new instance.
            /// </param>
            /// <exception cref="ArgumentNullException">
            ///    <paramref name="file" /> is <see langword="null" />.
            /// </exception>
00097             public IsoMovieHeaderBox (BoxHeader header, TagLib.File file,
                                      IsoHandlerBox handler)
                  : base (header, file, handler)
            {
                  if (file == null)
                        throw new ArgumentNullException ("file");
                  
                  int bytes_remaining = DataSize;
                  ByteVector data;
                  
                  if (Version == 1) {
                        // Read version one (large integers).
                        data = file.ReadBlock (Math.Min (28,
                              bytes_remaining));
                        if (data.Count >= 8)
                              creation_time = data.Mid (0,
                                    8).ToULong ();
                        if (data.Count >= 16)
                              modification_time = data.Mid (8,
                                    8).ToULong ();
                        if (data.Count >= 20)
                              timescale = data.Mid (16, 4).ToUInt ();
                        if (data.Count >= 28)
                              duration = data.Mid (20, 8).ToULong ();
                        bytes_remaining -= 28;
                  } else {
                        // Read version zero (normal integers).
                        data = file.ReadBlock (Math.Min (16,
                              bytes_remaining));
                        if (data.Count >= 4)
                              creation_time = data.Mid (0,
                                    4).ToUInt ();
                        if (data.Count >= 8)
                              modification_time = data.Mid (4,
                                    4).ToUInt ();
                        if (data.Count >= 12)
                              timescale = data.Mid (8, 4).ToUInt ();
                        if (data.Count >= 16)
                              duration = data.Mid (12, 4).ToUInt ();
                        bytes_remaining -= 16;
                  }
                  
                  data = file.ReadBlock (Math.Min (6, bytes_remaining));
                  if (data.Count >= 4)
                        rate = data.Mid (0, 4).ToUInt ();
                  if (data.Count >= 6)
                        volume = data.Mid (4, 2).ToUShort ();
                  file.Seek (file.Tell + 70);
                  bytes_remaining -= 76;
                  
                  data = file.ReadBlock (Math.Min (4,
                        bytes_remaining));
                  
                  if (data.Count >= 4)
                        next_track_id = data.Mid (0, 4).ToUInt ();
            }
            
            #endregion
            
            
            
            #region Public Properties
            
            /// <summary>
            ///    Gets the creation time of movie represented by the
            ///    current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="DateTime" /> value containing the creation
            ///    time of the movie represented by the current instance.
            /// </value>
00168             public DateTime CreationTime {
                  get {
                        return new System.DateTime (1904, 1, 1, 0, 0,
                              0).AddTicks ((long)(10000000 *
                                    creation_time));
                  }
            }
            
            /// <summary>
            ///    Gets the modification time of movie represented by the
            ///    current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="DateTime" /> value containing the
            ///    modification time of the movie represented by the current
            ///    instance.
            /// </value>
00185             public DateTime ModificationTime {
                  get {
                        return new System.DateTime (1904, 1, 1, 0, 0,
                              0).AddTicks ((long)(10000000 *
                                    modification_time));
                  }
            }
            
            /// <summary>
            ///    Gets the duration of the movie represented by the current
            ///    instance.
            /// </summary>
            /// <value>
            ///    A <see cref="TimeSpan" /> value containing the duration
            ///    of the movie represented by the current instance.
            /// </value>
00201             public TimeSpan Duration {
                  get {
                        // The length is the number of ticks divided by
                        // ticks per second.
                        return TimeSpan.FromSeconds ((double) duration /
                              (double) timescale);
                  }
            }
            
            /// <summary>
            ///    Gets the playback rate of the movie represented by the
            ///    current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="double" /> value containing the playback
            ///    rate of the movie represented by the current instance.
            /// </value>
00218             public double Rate {
                  get {return ((double) rate) / ((double) 0x10000);}
            }
            
            /// <summary>
            ///    Gets the playback volume of the movie represented by the
            ///    current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="double" /> value containing the playback
            ///    volume of the movie represented by the current instance.
            /// </value>
00230             public double Volume {
                  get {return ((double) volume) / ((double) 0x100);}
            }
            
            /// <summary>
            ///    Gets the ID of the next track in the movie represented by
            ///    the current instance.
            /// </summary>
            /// <value>
            ///   A <see cref="uint" /> value containing the ID of the next
            ///   track in the movie represented by the current instance.
            /// </value>
00242             public uint NextTrackId {
                  get {return next_track_id;}
            }
            
            #endregion
      }
}

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