/// <summary>
/// Waits for the frame extractor to be ready for playback.
/// Returns true if successful, false if it timed out.
/// </summary>
private bool WaitForPlaybackReadyState()
{
RealtimeClock.Pause();
var renderTime = RealtimeClock.PositionSeconds;
var startTime = DateTime.UtcNow;
var cycleCount = -1;
FFmpegMediaFrame playbackFrame = null;
while (IsCancellationPending == false)
{
if (DateTime.UtcNow.Subtract(startTime) > Constants.WaitForPlaybackReadyStateTimeout)
{
ErrorOccurredCallback(this, new MediaPlaybackException(MediaPlaybackErrorSources.WaitForPlaybackReadyState,
MediaPlaybackErrorCode.WaitForPlaybackTimedOut,
string.Format("Waiting for playback ready state @ {0:0.000} timed Out in {1} cycles", renderTime, cycleCount)));
return(false);
}
cycleCount++;
// Wait for a decoding cycle.
MediaFramesExtractedDone.Wait(Constants.FrameExtractorWaitMs);
renderTime = RealtimeClock.PositionSeconds;
playbackFrame = PrimaryFramesCache.GetFrame(renderTime, CheckFrameBounds);
if (playbackFrame == null && PrimaryFramesCache.Count > 0)
{
playbackFrame = PrimaryFramesCache.FirstFrame;
RealtimeClock.PositionSeconds = playbackFrame.StartTime;
}
if (playbackFrame != null)
{
break;
}
}
// Do some additional logging
System.Diagnostics.Debug.WriteLineIf(
cycleCount >= 0,
string.Format("WaitForPlaybackReadyState @ {0:0.000} = {1} cycles. Leading Frames: {2}, Frame Index: {3}, Frame Start: {4}",
renderTime,
cycleCount,
PrimaryFramesCache.Count,
PrimaryFramesCache.IndexOf(playbackFrame),
(playbackFrame != null ?
playbackFrame.StartTime.ToString("0.000") : "NULL")));
return(true);
}
/// <summary>
/// Queries if a leading frame for the given position is immediately available.
/// </summary>
/// <param name="position">The position.</param>
/// <returns></returns>
public bool QueryIsFrameAvailable(decimal position)
{
return(PrimaryFramesCache.GetFrame(position, true) != null);
}