private void SmoothFamiStudioScrolling(VideoFrameMetadata[] frames, Song song)
{
var patternIndices = new int[frames.Length];
var absoluteNoteIndices = new float[frames.Length];
// Keep copy of original pattern/notes.
for (int i = 0; i < frames.Length; i++)
{
patternIndices[i] = frames[i].playPattern;
absoluteNoteIndices[i] = song.GetPatternStartAbsoluteNoteIndex(frames[i].playPattern, (int)frames[i].playNote);
}
// Do moving average to smooth the movement.
for (int i = 0; i < frames.Length; i++)
{
var averageSize = (Utils.Max(song.GetPatternGroove(patternIndices[i])) + 1) / 2;
averageSize = Math.Min(averageSize, i);
averageSize = Math.Min(averageSize, absoluteNoteIndices.Length - i - 1);
var sum = 0.0f;
var cnt = 0;
for (int j = i - averageSize; j <= i + averageSize; j++)
{
if (j >= 0 && j < absoluteNoteIndices.Length)
{
sum += absoluteNoteIndices[j];
cnt++;
}
}
sum /= cnt;
frames[i].playPattern = song.PatternIndexFromAbsoluteNoteIndex((int)sum);
frames[i].playNote = sum - song.GetPatternStartAbsoluteNoteIndex(frames[i].playPattern);
}
}