byte[] GetDataBytes(TPendingSample Sample)
{
var MdatIndex = Sample.MdatIndex;
//Sample.DataPosition, Sample.DataSizeuint MdatIndex, long Position, long Size)
if (!HasMdat(MdatIndex))
{
throw new System.Exception("Not yet recieved mdat #" + MdatIndex);
}
var Meta = Mdats[MdatIndex];
long Position;
if (Sample.DataFilePosition.HasValue)
{
Position = Sample.DataFilePosition.Value - Meta.Atom.AtomDataFilePosition;
}
else
{
Position = Sample.DataPosition.Value;
}
return(Meta.Bytes.SubArray(Position, Sample.DataSize));
}
void ParseNextMp4Header()
{
// check if there's more data to be read
var KnownFileSize = GetKnownFileSize();
if (Mp4BytesRead >= KnownFileSize)
{
return;
}
int TimeOffset = 0;
System.Action <PopX.Mpeg4.TTrack> EnumTrack = (Track) =>
{
System.Action <byte[], int> PushPacket;
byte[] Sps_AnnexB;
byte[] Pps_AnnexB;
// track has header (so if we have moov and moof's, this only comes up once, and that's when we need to decode SPS/PPS
if (Track.SampleDescriptions != null)
{
if (Track.SampleDescriptions[0].Fourcc != "avc1")
{
throw new System.Exception("Expecting fourcc avc1, got " + Track.SampleDescriptions[0].Fourcc);
}
H264.AvccHeader Header;
Header = PopX.H264.ParseAvccHeader(Track.SampleDescriptions[0].AvccAtomData);
// wrong place to assign this! should be when we assign the track index
H264TrackHeader = Header;
var Pps = new List <byte>(new byte[] { 0, 0, 0, 1 });
Pps.AddRange(Header.PPSs[0]);
Pps_AnnexB = Pps.ToArray();
var Sps = new List <byte>(new byte[] { 0, 0, 0, 1 });
Sps.AddRange(Header.SPSs[0]);
Sps_AnnexB = Sps.ToArray();
PushPacket = (Packet, FrameNumber) =>
{
H264.AvccToAnnexb4(Header, Packet, (Bytes) => { PushFrame_AnnexB(Bytes, FrameNumber); });
};
}
else if (Preconfigured_SPS_Bytes != null && Preconfigured_SPS_Bytes.Length > 0)
{
throw new System.Exception("Need to refactor to process preconfigured SPS before handling tracks");
// split this header
Sps_AnnexB = Preconfigured_SPS_Bytes;
Pps_AnnexB = null;
// gr: turns out these are AVCC, not annexb
// gr: should be able to auto detect without header
//PushPacket = PushAnnexB;
H264.AvccHeader Header = new H264.AvccHeader();
Header.NaluLength = 2;
PushPacket = (Packet, FrameNumber) =>
{
H264.AvccToAnnexb4(Header, Packet, (Bytes) => { PushFrame_AnnexB(Bytes, FrameNumber); });
};
}
else
{
// track without header, assume it's already come via moov and this is a moof
Sps_AnnexB = null;
Pps_AnnexB = null;
PushPacket = null;
}
// load h264 header
if (Sps_AnnexB != null)
{
H264.Profile Profile;
float Level;
PopX.H264.GetProfileLevel(Sps_AnnexB, out Profile, out Level);
if (Profile != H264.Profile.Baseline)
{
Debug.LogWarning("PopH264 currently only supports baseline profile. This is " + Profile + " level=" + Level);
}
PushFrame_AnnexB(Sps_AnnexB, 0);
PushFrame_AnnexB(Pps_AnnexB, 0);
}
// load samples
if (Track.Samples == null)
{
if (VerboseDebug)
{
Debug.Log("Mp4 Track with null samples (next mdat=" + NextMdat + ")");
}
}
else
{
// gr: is there a better mdat ident? don't think so, it's just the upcoming one in mpeg sequence
// gr: sometimes, the mdat is before the tracks...
// gr: the sample offset also needs correcting
var MdatIndex = MDatBeforeTrack ? NextMdat - 1 : 0;
if (VerboseDebug)
{
Debug.Log("Found mp4 track " + Track.Samples.Count + " for next mdat: " + MdatIndex);
}
if (Track.Samples.Count > 0)
{
var LastSampleTime = Track.Samples[Track.Samples.Count - 1].PresentationTimeMs;
if (!LastFrameTime.HasValue)
{
LastFrameTime = LastSampleTime;
}
LastFrameTime = Mathf.Max(LastFrameTime.Value, LastSampleTime);
}
foreach (var Sample in Track.Samples)
{
try
{
var NewSample = new TPendingSample();
if (PendingInputSamples == null)
{
PendingInputSamples = new List <TPendingSample>();
}
NewSample.Sample = Sample;
NewSample.MdatIndex = MdatIndex;
//NewSample.DataPosition = Sample.DataPosition;
//NewSample.DataFilePosition = Sample.DataFilePosition;
//NewSample.DataSize = Sample.DataSize;
var TimeOffsetMs = (int)(TimeOffset / 10000.0f);
//NewSample.PresentationTime = Sample.PresentationTimeMs + TimeOffsetMs;
NewSample.Format = PacketFormat.Avcc;
PendingInputSamples.Add(NewSample);
}
catch (System.Exception e)
{
Debug.LogException(e);
break;
}
}
}
};
System.Action <List <PopX.Mpeg4.TTrack> > EnumTracks = (Tracks) =>
{
// moof headers don't have track headers, so we should have our track by now
// this track may be the original though, so hunt down the h264 one
if (!H264TrackIndex.HasValue)
{
for (int t = 0; t < Tracks.Count; t++)
{
var Track = Tracks[t];
if (Track.SampleDescriptions == null)
{
continue;
}
if (Track.SampleDescriptions[0].Fourcc != "avc1")
{
Debug.Log("Skipping track codec: " + Track.SampleDescriptions[0].Fourcc);
continue;
}
H264TrackIndex = t;
}
}
if (!H264TrackIndex.HasValue)
{
throw new System.Exception("Couldn't find avc1 track");
}
EnumTrack(Tracks[H264TrackIndex.Value]);
};
System.Action <PopX.TAtom> EnumMdat = (MdatAtom) =>
{
if (VerboseDebug)
{
Debug.Log("EnumMdat( NextMdat=" + NextMdat);
}
if (!H264TrackIndex.HasValue)
{
MDatBeforeTrack = true;
}
// this is the meta for the pending mdat
var MdatIndex = NextMdat;
if (Mdats == null)
{
Mdats = new Dictionary <uint, MdatBlock>();
}
var Mdat = new MdatBlock();
Mdat.Atom = MdatAtom;
Mdat.FileOffset = Mdat.Atom.AtomDataFilePosition; // need a better way to do this
if (VerboseDebug)
{
Debug.Log("Got MDat " + MdatIndex + " x" + Mdat.Bytes.Length + " bytes");
}
Mdats.Add(MdatIndex, Mdat);
// increment once everything succeeds
NextMdat++;
};
// ideally only once we've verified we have an mp4, but before moov. Maybe just if an ftyp is found
if (Decoder == null)
{
Decoder = new PopH264.Decoder(DecoderParams, DecodeOnSeperateThread);
}
System.Func <long, byte[]> PopData = (long DataSize) =>
{
var Data = ReadFileFunction(Mp4BytesRead, DataSize);
Mp4BytesRead += DataSize;
return(Data);
};
try
{
PopX.Mpeg4.ParseNextAtom(PopData, Mp4BytesRead, EnumTracks, EnumMdat);
}
catch (System.Exception e)
{
Debug.LogException(e);
}
}