private void Fragment(string text, int fragmenterIndex, IList <Fragment> fragments)
{
if (fragmenterIndex >= fragmenters.Count || string.IsNullOrEmpty(text))
{
return;
}
IFragmenter fragmenter = fragmenters[fragmenterIndex];
int index = 0;
foreach (Fragment f in fragmenter.GetFragments(text))
{
if (f.StartIndex > index)
{
Fragment(text.Substring(index, f.StartIndex - index), fragmenterIndex + 1, fragments);
}
if (!string.IsNullOrEmpty(f.InnerContents))
{
Fragment(f.InnerContents, 0, f.ChildFragments);
}
fragmenter.Add(f, fragments);
index = f.StartIndex + f.Length;
}
if (index < text.Length)
{
Fragment(text.Substring(index), fragmenterIndex + 1, fragments);
}
}
public MP4Document Build(Movie movie)
{
if (Fragmenter == null)
{
Fragmenter = new TimeBasedFragmenter();
}
Track2Sample = movie.Tracks.ToDictionary(x => x, y => y.Samples);
Track2SampleSizes = movie.Tracks.ToDictionary(x => x, y => y.Samples.Select(x => x.Size).ToArray());
var meta = Variant.Get();
MP4Document doc = new MP4Document(meta);
doc.AddAtom(CreateFileTypeBox(movie));
var chunks = movie.Tracks.ToDictionary(x => x, GetChunkSizes);
var moov = CreateMovieBox(movie, chunks);
doc.AddAtom(moov);
var contentSize = moov.GetPath(TRAK, MDIA, MINF, STBL, STSZ).OfType <AtomSTSZ>().Sum(x => x.SampleSize);
var mdat = new AtomMDAT(movie, chunks, contentSize);
doc.AddAtom(mdat);
/*
* dataOffset is where the first sample starts. In this special mdat the samples always start
* at offset 16 so that we can use the same offset for large boxes and small boxes
*/
uint dataOffset = mdat.DataOffset;
foreach (var chunkOffsetBox in ChunkOffsetBoxes.Values)
{
for (var i = 0; i < chunkOffsetBox.Entries.Count; i++)
{
chunkOffsetBox.Entries[i] += dataOffset;
}
}
foreach (var saio in SampleAuxiliaryInformationOffsetsBoxes)
{
long offset = saio.Size; // the calculation is systematically wrong by 4, I don't want to debug why. Just a quick correction --san 14.May.13
offset += 4 + 4 + 4 + 4 + 4 + 24;
// size of all header we were missing otherwise (moov, trak, mdia, minf, stbl)
object b = saio;
do
{
BaseAtom current = (BaseAtom)b;
b = current.Parent;
offset += ((IBoxContainer)b).SubAtoms.TakeWhile(box => box != current).Sum(box => box.Size);
} while (b is BoxAtom);
long[] saioOffsets = saio.Offsets;
for (int i = 0; i < saioOffsets.Length; i++)
{
saioOffsets[i] += offset;
}
}
return(doc);
}
