private void SeekToTimestampInternal(double timestamp, out double newTimestamp)
{
var oldTimestamp = currentTimestamp;
reader.FrameQueue.Clear();
reader.AudioQueue.Clear();
previousFrames.Clear();
reader.SeekToTimestamp(timestamp);
synchronization = null;
while (reader.ReadNextPacket() &&
(reader.FrameQueue.Count == 0 ||
Math.Abs(reader.FrameQueue.Peek().Timestamp - oldTimestamp) < Math.Abs(reader.FrameQueue.Peek().Timestamp - timestamp)))
{
reader.FrameQueue.Clear();
reader.AudioQueue.Clear();
}
if (TryEnsureFrameQueueNotEmpty())
{
currentFrame = reader.FrameQueue.Dequeue();
newTimestamp = currentFrame.Timestamp;
}
else
{
// should never happen
currentFrame = new MovieFrame
{
RgbaData = new byte[GraphicsHelper.AlignedSize(reader.Width, reader.Height)],
Timestamp = timestamp
};
newTimestamp = Movie.Duration;
}
}
public void GoToEnd()
{
SeekToTimestamp(Movie.Duration);
while (reader.ReadNextPacket())
{
while (reader.FrameQueue.Any())
{
currentFrame = reader.FrameQueue.Dequeue();
}
}
State = MoviePlaybackState.End;
currentTimestamp = Movie.Duration;
}
public StandardMoviePlayback(IMovie movie)
: base(ResourceVolatility.Volatile)
{
Movie = movie;
reader = movie.Read();
videoSpeed = 1.0;
frameImage = new MoviePlaybackImage();
currentFrame = new MovieFrame
{
RgbaData = new byte[GraphicsHelper.AlignedSize(reader.Width, reader.Height)],
Timestamp = 0
};
}
public void OnUpdate(FrameTime frameTime)
{
switch (State)
{
case MoviePlaybackState.Stopped:
break;
case MoviePlaybackState.Playing:
if (!synchronization.HasValue)
{
synchronization = new Synchronization
{
RealTime = frameTime.TotalSeconds,
MovieFrameTimestamp = currentTimestamp
};
}
var realTimePassed = frameTime.TotalSeconds - synchronization.Value.RealTime;
var signedSpeed = playingReversed ? -videoSpeed : videoSpeed;
currentTimestamp = Math.Max(0, realTimePassed * signedSpeed + synchronization.Value.MovieFrameTimestamp);
if (playingReversed)
{
while (currentFrame.Timestamp > currentTimestamp)
{
if (previousFrames.Count == 0 && !TryFillFrameStack(currentTimestamp))
{
ReverseDirection();
return;
}
currentFrame = previousFrames.Pop();
}
}
else
{
var continueGettingNext = true;
do
{
if (!TryEnsureFrameQueueNotEmpty())
{
if (currentTimestamp >= Movie.Duration)
{
State = MoviePlaybackState.End;
}
return;
}
var nextFrame = reader.FrameQueue.Peek();
if (nextFrame.Timestamp <= currentTimestamp)
{
currentFrame = reader.FrameQueue.Dequeue();
}
else
{
continueGettingNext = false;
}
} while (continueGettingNext);
}
break;
case MoviePlaybackState.Paused:
break;
case MoviePlaybackState.End:
break;
default:
throw new ArgumentOutOfRangeException();
}
if (currentFrame.RgbaData != frameImage.RgbaData)
{
// todo: size to frame?
frameImage.Update(new IntSize2(reader.Width, reader.Height), currentFrame.RgbaData);
}
}
