/// <summary>
/// Finds the currently played beat given a list of tracks and the current time.
/// </summary>
/// <param name="tracks">The tracks in which to search the played beat for.</param>
/// <param name="tick">The current time in midi ticks.</param>
/// <returns>The information about the current beat or null if no beat could be found.</returns>
public MidiTickLookupFindBeatResult FindBeat(Track[] tracks, int tick)
{
// get all beats within the masterbar
var masterBar = FindMasterBar(tick);
if (masterBar == null)
{
return(null);
}
var trackLookup = new FastDictionary <int, bool>();
foreach (var track in tracks)
{
trackLookup[track.Index] = true;
}
BeatTickLookup beat = null;
int index = 0;
var beats = masterBar.Beats;
for (int b = 0; b < beats.Count; b++)
{
// is the current beat played on the given tick?
var currentBeat = beats[b];
// skip non relevant beats
if (!trackLookup.ContainsKey(currentBeat.Beat.Voice.Bar.Staff.Track.Index))
{
continue;
}
if (currentBeat.Start <= tick && tick < currentBeat.End)
{
// take the latest played beat we can find. (most right)
if (beat == null || (beat.Start < currentBeat.Start))
{
beat = beats[b];
index = b;
}
}
// if we are already past the tick, we can stop searching
else if (currentBeat.End > tick)
{
break;
}
}
if (beat == null)
{
return(null);
}
// search for next relevant beat in masterbar
BeatTickLookup nextBeat = null;
for (int b = index + 1; b < beats.Count; b++)
{
var currentBeat = beats[b];
if (currentBeat.Start > beat.Start && trackLookup.ContainsKey(currentBeat.Beat.Voice.Bar.Staff.Track.Index))
{
nextBeat = currentBeat;
break;
}
}
// first relevant beat in next bar
if (nextBeat == null && masterBar.NextMasterBar != null)
{
var nextBar = masterBar.NextMasterBar;
beats = nextBar.Beats;
for (int b = 0; b < beats.Count; b++)
{
var currentBeat = beats[b];
if (trackLookup.ContainsKey(currentBeat.Beat.Voice.Bar.Staff.Track.Index))
{
nextBeat = currentBeat;
break;
}
}
}
var result = new MidiTickLookupFindBeatResult();
result.CurrentBeat = beat.Beat;
result.NextBeat = nextBeat == null ? null : nextBeat.Beat;
result.Duration = MidiUtils.TicksToMillis(beat.End - beat.Start, masterBar.Tempo);
return(result);
}
/// <summary>
/// Adds the given <see cref="BeatTickLookup"/> to the current <see cref="MasterBarTickLookup"/>.
/// </summary>
/// <param name="beat">The lookup to add.</param>
public void AddBeat(BeatTickLookup beat)
{
_currentMasterBar.AddBeat(beat);
}
/// <summary>
/// Adds a new <see cref="BeatTickLookup"/> to the list of played beats during this MasterBar period.
/// </summary>
/// <param name="beat"></param>
public void AddBeat(BeatTickLookup beat)
{
Beats.Add(beat);
}