public static void UpdateBpm(MidiFile rawMidi, SongItem songItem)
{
if (rawMidi == null)
{
Debug.LogError("Cannot find the midi file");
return;
}
songItem.notes.Clear();
var detectedTempoMap = rawMidi.GetTempoMap();
var tempoMap = songItem.useCurrentBpmMidiImport ? TempoMap.Create(detectedTempoMap.TimeDivision, Tempo.FromBeatsPerMinute(songItem.bpm), detectedTempoMap.TimeSignature.AtTime(0)) : detectedTempoMap;
if (!songItem.useCurrentBpmMidiImport)
{
songItem.bpm = (int)rawMidi.GetTempoMap().Tempo.AtTime(0).BeatsPerMinute;
}
Debug.Log($"Updating Midi Data {tempoMap.TimeDivision}, {songItem.bpm}bpm");
int count = 0;
foreach (var note in rawMidi.GetNotes())
{
count++;
var beat = GetMetricTimeSpanTotal(note.TimeAs <MetricTimeSpan>(tempoMap)) * songItem.bpm / 60;
var beatLength = GetMetricTimeSpanTotal(note.LengthAs <MetricTimeSpan>(tempoMap)) * songItem.bpm / 60;
// Debug.Log(RoundToNearestBeat(beat));
songItem.notes.Add(new SongItem.MidiNote()
{
noteName = ParseEnum <SongItem.NoteName>(note.NoteName.ToString()),
noteOctave = note.Octave,
time = GetMetricTimeSpanTotal(note.TimeAs <MetricTimeSpan>(tempoMap)),
noteLength = GetMetricTimeSpanTotal(note.LengthAs <MetricTimeSpan>(tempoMap)),
//This two is for recalculating the currect time when the bpm is changed
beatIndex = SongItem.RoundToNearestBeat(beat),
beatLengthIndex = SongItem.RoundToNearestBeat(beatLength),
});
}
Debug.Log(count + " Note(s) detected from Midi file");
EditorUtility.SetDirty(songItem);
}
public override List <SongItem.MidiNote> OnGenerateSequence(SongItem songItem)
{
//Safety checks
if (!songItem || !songItem.clip)
{
Debug.LogError("Failed to generate, the clip or the songItem is null");
return(null);
}
//Seed handling
if (reseed)
{
Random.InitState(System.Environment.TickCount);
}
else
{
Random.InitState(seed);
}
//Calculating the total beat length with quantize to 0.25
var totalBeat = SongItem.RoundToNearestBeat(songItem.bpm * songItem.clip.length / 60f);
// Debug.Log(totalBeat);
var notes = new List <SongItem.MidiNote>();
///Begin handling onset notes generations
var lastBeatIndex = -1f;
if (algorithm == Algorithm.OnsetRandom)
{
if (songItem.onsetData != null && songItem.onsetData.Length > 0)
{
for (int i = 0; i < songItem.onsetData.Length; i++)
{
var onsetTime = AudioAnalysis.getTimeFromIndex(songItem.clip, i);
var beatIndex = SongItem.RoundToNearestBeat(onsetTime * songItem.bpm / 60);
//Check for close beat distance
if (lastBeatIndex == -1 || (beatIndex - lastBeatIndex) > closeBeatDistance)
{
var fallInRange = false;
if (usePercentage)
{
var onsetPrecentage = (songItem.onsetData[i] / songItem.onsetMax);
fallInRange = onsetPrecentage > onsetMinThresholdPercentage && onsetPrecentage <= onsetMaxThresholdPercentage;
}
else
{
fallInRange = songItem.onsetData[i] > onsetMinThreshold && songItem.onsetData[i] <= onsetMaxThreshold;
}
if (fallInRange)
{
if (!allowHalfStep && (beatIndex % 1) == 0.5f)
{
continue;
}
if (!allowQuarterStep && ((beatIndex % 1) == 0.25f || (beatIndex % 1) == 0.75f))
{
continue;
}
notes.Add(new SongItem.MidiNote()
{
beatIndex = beatIndex,
beatLengthIndex = 1f,
noteName = SongItem.noteNameMapping[Random.Range(0, targetTrackCount)],
noteOctave = 3,
//in seconds
time = onsetTime,
noteLength = 60f / songItem.bpm * 1f,
});
lastBeatIndex = beatIndex;
}
}
}
return(notes);
}
else
{
Debug.LogWarning("Onset data is empty, nothing generated.");
return(null);
}
}
//Begin simple random note geneation
var maxCountX = 1;
var preferredX = -1;
var previousX = -1;
//First to loop through all beat
for (float y = 0; y < totalBeat; y += 1f)
{
var currentCountX = 0;
maxCountX = 1;
//Randomize max count x
if (UnityEngine.Random.value > 0.9f)
{
maxCountX = 2;
}
else
if (UnityEngine.Random.value < 0.2f)
{
maxCountX = 0;
}
//Randomize preferred X
if (maxCountX == 1)
{
while (previousX == preferredX)
{
preferredX = UnityEngine.Random.Range(0, 4);
}
}
previousX = preferredX;
//Seconds to loop through all track
for (int x = 0; x < targetTrackCount; x++)
{
//Not our targeted track0
if (maxCountX == 1 && preferredX != x)
{
continue;
}
//We have more than on quota, try some randomness
if (maxCountX > 1)
{
//Unlucky -> skip
if (UnityEngine.Random.value > 0.5f)
{
continue;
}
}
//We have reached out quota, skip
if (currentCountX >= maxCountX)
{
continue;
}
//Going to create our note at this beat
notes.Add(new SongItem.MidiNote()
{
beatIndex = y,
beatLengthIndex = 1f,
noteName = SongItem.noteNameMapping[x],
noteOctave = 3,
//in seconds
time = 60f / songItem.bpm * y,
noteLength = 60f / songItem.bpm * 1f,
});
currentCountX++;
}
}
return(notes);
}
private void OnValidate()
{
closeBeatDistance = Mathf.Max(0, SongItem.RoundToNearestBeat(closeBeatDistance));
}
