void OnDisable()
{
if (_session != null)
{
// Close and dispose the FFmpeg session.
_session.Close();
_session.Dispose();
_session = null;
}
}
void Update()
{
// Lazy initialization
if (_session == null)
{
// Start an FFmpeg session.
_session = FFmpegSession.Create(
gameObject.name,
_source.width,
_source.height,
_frameRate, preset
);
_startTime = Time.time;
_frameCount = 0;
_frameDropCount = 0;
}
var gap = Time.time - FrameTime;
var delta = 1 / _frameRate;
if (gap < 0)
{
// Update without frame data.
_session.PushFrame(null);
}
else if (gap < delta)
{
// Single-frame behind from the current time:
// Push the current frame to FFmpeg.
_session.PushFrame(_source);
_frameCount++;
}
else if (gap < delta * 2)
{
// Two-frame behind from the current time:
// Push the current frame twice to FFmpeg. Actually this is not
// an efficient way to catch up. We should think about
// implementing frame duplication in a more proper way. #fixme
_session.PushFrame(_source);
_session.PushFrame(_source);
_frameCount += 2;
}
else
{
// Show a warning message about the situation.
WarnFrameDrop();
// Push the current frame to FFmpeg.
_session.PushFrame(_source);
// Compensate the time delay.
_frameCount += Mathf.FloorToInt(gap * _frameRate);
}
}
