/// <summary>
/// Pushes a set of frames to IIS. Will trigger a connect if needed.
/// </summary>
private void PushStream(MediaStream stream, FileRoot TargetMp4fFile)
{
if (stream == null || stream.Frames == null)
{
return; // no frames.
}
SanitiseStream(stream);
if (stream.Frames.Count < 1)
{
return; // no frames.
}
if (!PushServer.IsConnected(stream.TrackId))
{
ConnectAndPushHeaders(stream, TargetMp4fFile);
}
// set start-of-fragment time from PTS
stream.Offset = stream.Frames[0].FramePresentationTime - stream.Frames[0].FrameDuration;
// Push the fragment
var fragment_handler = TargetMp4fFile.GenerateFragment(stream);
PushServer.PushData(stream.TrackId, fragment_handler.MoofData());
PushServer.PushData(stream.TrackId, fragment_handler.MdatData());
}
/// <summary>
/// Used once per connection, this opens a long-life HTTP stream
/// and pushes the very basic MP4 parts needed to get IIS working.
/// </summary>
private void ConnectAndPushHeaders(MediaStream stream, FileRoot TargetMp4fFile)
{
SmilGenerator smil = new SmilGenerator("HCS Encoder by Iain Ballard.", stream);
smil.ApproxBitrate = stream.Bitrate;
MP4_Mangler.ExtraBoxes.SmoothSmil ssmil = new MP4_Mangler.ExtraBoxes.SmoothSmil(smil.Generate());
PushServer.Connect(stream.TrackId); // This pushes to the subpath: Streams({id}-stream{index})
// push headers (only done once per track)
// each one needs it's own HTTP Chunk, so don't concat!
PushServer.PushData(stream.TrackId, TargetMp4fFile.GenerateFileSpec());
PushServer.PushData(stream.TrackId, ssmil.deepData());
PushServer.PushData(stream.TrackId, TargetMp4fFile.GenerateHeaders());
}
/// <summary>
/// Shut down the streams and close connections.
/// </summary>
public void Close()
{
byte[] EOS = Mp4fFile.GenerateFooters(); // End-Of-Stream signal
// Close off all streams, taking them out of live mode:
foreach (var stream in Streams)
{
try {
PushServer.PushData(stream.TrackId, EOS);
} catch { }
}
// Final close:
PushServer.Close();
}