/// <summary>
/// The SlideImageGenerator can be shared by a set of modules.
/// This allows us to avoid duplicating work of building slide images.
/// Use this static method to get the instance, then run Process if
/// the job has changed.
/// </summary>
/// <param name="job"></param>
/// <param name="progressTracker"></param>
/// <param name="log"></param>
/// <returns></returns>
public static SlideImageGenerator GetInstance(ArchiveTranscoderJob job,
ProgressTracker progressTracker,
LogMgr log)
{
if (instance == null)
{
instance = new SlideImageGenerator(job, progressTracker, log);
}
else
{
//Reset all properties
instance.Job = job;
instance.TheProgressTracker = progressTracker;
instance.TheLogMgr = log;
instance.TheRtDocuments = null;
instance.TheSlideMessages = null;
}
return(instance);
}
/// <summary>
/// Do all the initial time consuming preparation including building temp directories from
/// any decks specified with the job, and scanning data prior to start time to attempt to determine
/// the presentation state.
/// We require that Init complete before GetNextSample.
/// </summary>
public bool Init(ProgressTracker progressTracker)
{
if ((streamPlayers == null) || (streamPlayers.Length == 0))
{
// No data is not considered an error.
return(true);
}
//preserve the end value to be restored when we're done.
int oldEnd = progressTracker.EndValue;
//build directories from any decks specified in the job
imageGenerator = SlideImageGenerator.GetInstance(this.job, progressTracker, logMgr);
//Refresh image export size and job in case they have changed.
imageGenerator.SetImageExportSize(false, this.outputWidth, this.outputHeight);
imageGenerator.Job = this.job;
//Run process to build or refresh deck images.
imageGenerator.Process();
//Tell SlideImageMgr about the decks.
slideImageMgr.SetSlideDirs(imageGenerator.OutputDirs);
//scan data preceeding start time to establish all initial state
progressTracker.CurrentValue = 0;
progressTracker.EndValue = (int)lookBehindDuration;
progressTracker.CustomMessage = "Initializing Presentation Data";
BufferChunk bc;
long timestamp;
while (!cancel)
{
long t; int index;
if (getNextStreamPlayerFrameTime(out t, out index))
{
if (t < start.Ticks)
{
if (streamPlayers[index].GetNextFrame(out bc, out timestamp))
{
slideImageMgr.ProcessFrame(bc);
progressTracker.CurrentValue = (int)(((TimeSpan)(new DateTime(timestamp) - streamPlayers[0].Start)).TotalSeconds);
}
else
{
break;
}
}
else
{
break;
}
}
else
{
break;
}
}
if (!cancel)
{
initialized = true;
}
progressTracker.CustomMessage = "";
progressTracker.EndValue = oldEnd;
return(true);
}