public Resolution CalculateSize(TranscoderProfile profile, MediaSource source, WebMediaInfo info = null)
{
try
{
if (!profile.HasVideoStream)
return new Resolution(0, 0);
if (info == null)
{
info = MediaInfoHelper.LoadMediaInfoOrSurrogate(source);
}
if (info.VideoStreams.Count > 0)
{
return Resolution.Calculate(info.VideoStreams.First().DisplayAspectRatio, profile.MaxOutputWidth, profile.MaxOutputHeight, 2);
}
}
catch (Exception ex)
{
Log.Warn("Failed to calculate size of output stream", ex);
}
// default
return Resolution.Calculate(MediaInfoHelper.DEFAULT_ASPECT_RATIO, profile.MaxOutputWidth, profile.MaxOutputHeight, 2);
}
public Resolution CalculateSize(TranscoderProfile profile, decimal displayAspectRatio)
{
return Resolution.Calculate(displayAspectRatio, profile.MaxOutputWidth, profile.MaxOutputHeight, 2);
}
public string StartStream(string identifier, TranscoderProfile profile, int position = 0, int audioId = STREAM_DEFAULT, int subtitleId = STREAM_DEFAULT)
{
// there's a theoretical race condition here between the insert in InitStream() and this, but the client should really, really
// always have a positive result from InitStream() before continuing, so their bad that the stream failed.
if (!Streams.ContainsKey(identifier) || Streams[identifier] == null)
{
Log.Warn("Stream requested for invalid identifier {0}", identifier);
return null;
}
if (profile == null)
{
Log.Warn("Stream requested for non-existent profile");
return null;
}
try
{
lock (Streams[identifier])
{
Log.Debug("StartStream with identifier {0} for file {1}", identifier, Streams[identifier].Context.Source.GetDebugName());
// initialize stream and context
ActiveStream stream = Streams[identifier];
stream.Context.StartPosition = position;
stream.Context.Profile = profile;
stream.Context.MediaInfo = MediaInfoHelper.LoadMediaInfoOrSurrogate(stream.Context.Source);
stream.Context.OutputSize = CalculateSize(stream.Context);
Reference<WebTranscodingInfo> infoRef = new Reference<WebTranscodingInfo>(() => stream.Context.TranscodingInfo, x => { stream.Context.TranscodingInfo = x; });
Log.Debug("Using {0} as output size for stream {1}", stream.Context.OutputSize, identifier);
sharing.StartStream(stream.Context, infoRef);
// get transcoder
stream.Transcoder = (ITranscoder)Activator.CreateInstance(Type.GetType(profile.TranscoderImplementationClass));
stream.Transcoder.Identifier = identifier;
// get audio and subtitle id
if (stream.Context.MediaInfo.AudioStreams.Where(x => x.ID == audioId).Count() > 0)
{
stream.Context.AudioTrackId = stream.Context.MediaInfo.AudioStreams.Where(x => x.ID == audioId).First().ID;
}
else if (audioId == STREAM_DEFAULT)
{
string preferredLanguage = Configuration.Streaming.DefaultAudioStream;
if (stream.Context.MediaInfo.AudioStreams.Count(x => x.Language == preferredLanguage) > 0)
{
stream.Context.AudioTrackId = stream.Context.MediaInfo.AudioStreams.First(x => x.Language == preferredLanguage).ID;
}
else if (preferredLanguage != "none" && stream.Context.MediaInfo.AudioStreams.Count() > 0)
{
stream.Context.AudioTrackId = stream.Context.MediaInfo.AudioStreams.First().ID;
}
}
if (stream.Context.MediaInfo.SubtitleStreams.Where(x => x.ID == subtitleId).Count() > 0)
{
stream.Context.SubtitleTrackId = stream.Context.MediaInfo.SubtitleStreams.Where(x => x.ID == subtitleId).First().ID;
}
else if (subtitleId == STREAM_DEFAULT)
{
string preferredLanguage = Configuration.Streaming.DefaultSubtitleStream;
if (stream.Context.MediaInfo.SubtitleStreams.Count(x => x.Language == preferredLanguage) > 0)
{
stream.Context.SubtitleTrackId = stream.Context.MediaInfo.SubtitleStreams.First(x => x.Language == preferredLanguage).ID;
}
else if (preferredLanguage == "external" && stream.Context.MediaInfo.SubtitleStreams.Count(x => x.Filename != null) > 0)
{
stream.Context.SubtitleTrackId = stream.Context.MediaInfo.SubtitleStreams.First(x => x.Filename != null).ID;
}
else if (preferredLanguage == "first" && stream.Context.MediaInfo.SubtitleStreams.Count() > 0)
{
stream.Context.SubtitleTrackId = stream.Context.MediaInfo.SubtitleStreams.First().ID;
}
}
Log.Debug("Final stream selection: audioId={0}, subtitleId={1}", stream.Context.AudioTrackId, stream.Context.SubtitleTrackId);
// build the pipeline
stream.Context.Pipeline = new Pipeline();
stream.Context.TranscodingInfo = new WebTranscodingInfo();
stream.Transcoder.BuildPipeline(stream.Context);
// start the processes and retrieve output stream
stream.Context.Pipeline.Assemble();
stream.Context.Pipeline.Start();
Stream finalStream = Streams[identifier].Context.Pipeline.GetFinalStream();
if (finalStream != null)
{
Streams[identifier].OutputStream = new ReadTrackingStreamWrapper(finalStream);
}
Log.Info("Started stream with identifier " + identifier);
return stream.Transcoder.GetStreamURL();
}
}
catch (Exception ex)
{
Log.Error("Failed to start stream " + identifier, ex);
return null;
}
}
