/// <summary>
/// Read the supplied configuration and prepare the transformer for work.
/// </summary>
private void PrepareTransformer(EncoderConfiguration.Configuration Configuration, List<EncoderPackage> Packages)
{
Config = Configuration;
TimeSpan TargetDuration = TimeSpan.FromSeconds(Config.EncoderSettings.FragmentSeconds);
PublishPoint = Config.Upload.VideoDestinationRoot;
if (String.IsNullOrEmpty(PublishPoint)) throw new ArgumentException("Publishing point must not be empty", "PublishUrl");
PushServer = new IisSmoothPush(new Uri(PublishPoint));
TrackDurations = new Dictionary<int, long>();
TrackOffsets = new Dictionary<int, long>();
targetDuration = (ulong)TargetDuration.Ticks;
Streams = new MediaStream[Packages.Count];
foreach (var pkg in Packages) {
if (pkg.Specification.HasVideo && pkg.Specification.HasAudio) {
throw new NotSupportedException("IIS Smooth output doesn't support pre-muxed streams");
}
if (pkg.Specification.HasAudio) {
Streams[pkg.JobIndex] = new MediaStream(); // for now, stream 0 is audio, and all others are video.
Streams[pkg.JobIndex].TrackId = pkg.JobIndex + 1;
Streams[pkg.JobIndex].FourCC = "mp3a"; // MP3
//Streams[pkg.JobIndex].FourCC = "mp4a"; // AAC
Streams[pkg.JobIndex].Height = 0;
Streams[pkg.JobIndex].Width = 0;
Streams[pkg.JobIndex].Bitrate = 96000; //pkg.Job.Bitrate; // later!
} else if (pkg.Specification.HasVideo) {
Streams[pkg.JobIndex] = new MediaStream(); // for now, stream 0 is audio, and all others are video.
Streams[pkg.JobIndex].TrackId = pkg.JobIndex + 1;
Streams[pkg.JobIndex].FourCC = "H264"; // this is the M$ format, not iso (which is 'avc1')
Streams[pkg.JobIndex].Height = Config.EncoderSettings.OutputHeight; // the actual size may be different due to scaling factor.
Streams[pkg.JobIndex].Width = Config.EncoderSettings.OutputWidth;
Streams[pkg.JobIndex].Bitrate = pkg.Job.Bitrate;
}
}
Mp4fFile = new FileRoot(Streams);
Demuxer = new MpegTS_Demux[Packages.Count];
for (int di = 0; di < Demuxer.Length; di++) {
Demuxer[di] = new MpegTS_Demux();
}
}
/// <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());
}
