public async Task <bool> WriteFragmentAsync(byte[] frag)
{
var br = new BoxReader(frag);
while (br.GetBoxType() != "mdat")
{
br.SkipBox();
}
br.SkipBoxHeader();
br.Skip(4);
int tsFrag = br.ReadByte() << 0x10 | br.ReadByte() << 0x8 | br.ReadByte() | br.ReadByte() << 0x18;
br.Skip(-8);
if (tsFrag < GetLastTagTimestamp()) // don't write aleady written fragment
{
return(false);
}
_fs.Seek(0, SeekOrigin.End);
await _fs.WriteAsync(frag, br.Position, frag.Length - br.Position);
return(true);
}
public static Segment GetSegmentFromBootstrapInfo(byte[] bootstrapInfo)
{
// parse bootstrap info box (abst)
var bootstrap = new BoxReader(bootstrapInfo);
// skip useless stuff
bootstrap.SkipBoxHeader();
bootstrap.Skip(1 + 3 + 4 + 1 + 4 + 8 + 8);
bootstrap.SkipString();
byte serverEntryCount = bootstrap.ReadByte();
for (byte _ = 0; _ < serverEntryCount; _++)
{
bootstrap.SkipString();
}
byte qualityEntryCount = bootstrap.ReadByte();
for (byte _ = 0; _ < qualityEntryCount; _++)
{
bootstrap.SkipString();
}
bootstrap.SkipString();
bootstrap.SkipString();
// get and parse (skip) segment run table (asrt) boxes
// MEH: there COULD be more than 1 asrt box, ignoring them for now
byte segmentRunTableCount = bootstrap.ReadByte();
for (byte _ = 0; _ < segmentRunTableCount; _++)
{
bootstrap.SkipBox();
}
// get and parse fragment run table (afrt) boxes (MEH: keep only the last one)
Segment segment = new Segment {
Id = 1
};
byte fragmentRunTableCount = bootstrap.ReadByte();
for (byte _ = 0; _ < fragmentRunTableCount; _++)
{
bootstrap.SkipBoxHeader();
bootstrap.Skip(1 + 3 + 4);
byte qualitySegmentUrlModifiers = bootstrap.ReadByte(); // hopefully this is 0 or 1
for (byte __ = 0; __ < qualitySegmentUrlModifiers; __++)
{
bootstrap.SkipString();
}
// this isn't really a segment, but whatever.
var frags = new List <Fragment> {
new Fragment(0, 0, 0)
};
uint fragRuns = bootstrap.ReadUInt32();
for (uint __ = 0; __ < fragRuns; __++)
{
var readFrag = new Fragment(bootstrap.ReadUInt32(), bootstrap.ReadUInt64(), bootstrap.ReadUInt32());
Fragment last = frags.Last();
// hopefully they are already sorted by id
for (uint i = last.Id + 1; i < readFrag.Id; i++)
{
frags.Add(last = new Fragment(i, last.TimestampEnd.TotalMilliseconds, last.Duration));
}
if (readFrag.Id != 0)
{
frags.Add(readFrag);
}
}
segment.Fragments = frags.ToArray();
}
return(segment);
}
