void ReadMP4Headers()
{
BoxType boxType;
while (this.boxReader.BaseStream.Position < this.boxReader.BaseStream.Length)
{
boxType = this.boxReader.PeekNextBoxType();
if (boxType == BoxTypes.Free)
{
FreeBox freeb = new FreeBox();
freeb.Read(this.boxReader);
//FreeBoxList.Add(freeb);
}
else if (boxType == BoxTypes.MediaData) // mdat
{
MediaDataBox mdb = new MediaDataBox();
mdb.Read(this.boxReader); // this doesn't really read all of mdat: payload is skipped
MediaDataBoxList.Add(mdb);
}
else if (boxType == BoxTypes.MovieFragmentRandomAccess)
{
MovieFragmentRandomAccessBox mfrab = new MovieFragmentRandomAccessBox();
mfrab.Read(this.boxReader);
}
else if (boxType == BoxTypes.Free)
{
FreeBox freeBox = new FreeBox();
freeBox.Read(this.boxReader);
}
else
{
// invalid box, just stop reading
break;
//Box box2 = new Box(boxType);
//box2.Read(this.boxReader);
//FreeBoxList.Add(box2);
//Debug.WriteLine(string.Format("Unknown BoxType: {0}", box2.Type.ToString()));
}
} // end of while
}
public override void LazyRead(int requestedBoxCount)
{
//this.m_reader.BaseStream.Seek(0L, SeekOrigin.Begin);
BoxType boxType;
while (this.m_reader.BaseStream.Position < this.m_reader.BaseStream.Length)
{
boxType = this.m_reader.PeekNextBoxType();
if (boxType == BoxTypes.MovieFragment)
{
IsMediaStreamFragmented = true;
break; // don't process fragment here, do it in the ISMV class (which is derived from this one)
}
else if (boxType == BoxTypes.FileType)
{
ftb = new FileTypeBox();
ftb.Read(this.m_reader);
Hints.CompatibleBrands = ftb.CompatibleBrands;
}
else if (boxType == BoxTypes.Movie)
{
mmb = new MovieMetadataBox();
mmb.Read(this.m_reader);
if (mmb.ObjectDescriptorBox != null)
{
base.ObjectDescriptor = mmb.ObjectDescriptorBox.Contents;
}
if (mmb.UserDataBox != null)
{
base.UserData = mmb.UserDataBox.Data;
}
}
else if (boxType == BoxTypes.Free)
{
FreeBox freeb = new FreeBox();
freeb.Read(this.m_reader);
FreeBoxList.Add(freeb);
}
else if (boxType == BoxTypes.MediaData) // mdat
{
MediaDataBox mdb = new MediaDataBox();
mdb.Read(this.m_reader); // this doesn't really read all of mdat: payload is skipped
MediaDataBoxList.Add(mdb);
}
else if (boxType == BoxTypes.MovieFragmentRandomAccess)
{
MovieFragmentRandomAccessBox = new MovieFragmentRandomAccessBox();
MovieFragmentRandomAccessBox.Read(this.m_reader);
}
else if (boxType == BoxTypes.Free)
{
FreeBox freeBox = new FreeBox();
freeBox.Read(this.m_reader);
FreeBoxList.Add(freeBox);
}
else
{
// invalid box, just stop reading
break;
//Box box2 = new Box(boxType);
//box2.Read(this.m_reader);
//FreeBoxList.Add(box2);
//Debug.WriteLine(string.Format("Unknown BoxType: {0}", box2.Type.ToString()));
}
} // end of while
// now that we know all about the input file in memory... fill a few structures to help others gain access to this information...
// this is for the case in which the mp4 file contains moov boxes (MovieMetadataBoxes).
if ((mmb != null) && (MediaTracks.Count == 0))
{
DurationIn100NanoSecs = (ulong)TimeArithmetic.ConvertToStandardUnit(mmb.MovieHeaderBox.TimeScale, mmb.MovieHeaderBox.Duration);
Hints.StreamTimeScale = mmb.MovieHeaderBox.TimeScale;
if (!IsMediaStreamFragmented)
{
CreateTracks <GenericAudioTrack, MP4VideoTrack, MP4TrackFormat>();
}
}
} // end of Read method
