private float FindFirstBeatTime(float[] beatTimes, float predictedBeatTimeDiff, BeatController.BeatLabelProcessorParams beatParams)
{
float result = 0;
int requiredHits = (int)((float)beatParams.beatFinderStepRange * beatParams.beatFinderHitThreshold);
int allowedMisses = beatParams.beatFinderStepRange - requiredHits;
for (int beatIndex = 0; beatIndex < beatTimes.Length - beatParams.beatFinderStepRange - 1; beatIndex++)
{
float currentBeatTime = beatTimes[beatIndex];
float predictedNextBeat = currentBeatTime + predictedBeatTimeDiff;
int missCounter = 0;
float nextTime = 0;
float error = 0;
bool isStartingBeat = false;
for (int i = beatIndex + 1; i < beatIndex + beatParams.beatFinderStepRange; i++)
{
nextTime = beatTimes[i];
while (nextTime > predictedNextBeat + beatParams.allowedErrorRange)
{
predictedNextBeat += predictedBeatTimeDiff;
// didnt miss miss beat but skipped too much!
missCounter++;
}
error = Mathf.Abs(predictedNextBeat - nextTime);
if (error > beatParams.allowedErrorRange)
{
missCounter++;
}
if ((i - beatIndex) - missCounter > requiredHits)
{
isStartingBeat = true;
result = currentBeatTime;
break;
}
else if (missCounter > allowedMisses)
{
// too many misses -> try next beat
break;
}
}
}
return(result);
}
public Beat ComputeBeat(BeatController.BeatLabelProcessorParams beatParams)
{
Beat beat = null;
if (_beatFile == null)
{
Debug.LogError("No BeatLabel File handed to BeatProcessor!");
return(beat);
}
float[] beatTimes = parseBeatTimes();
if (beatTimes.Length < 100)
{
Debug.LogError("Cannot parse Beattimes -> " + beatTimes.Length + " beats are not enough!");
}
else
{
float[] beatTimeDifferences = computeBeatDifferences(beatTimes);
System.Array.Sort(beatTimeDifferences);
float predictedBeatTimeDiff = beatTimeDifferences[(int)(beatTimeDifferences.Length * beatParams.fakeMedian)];
//foreach(float f in beatTimeDifferences)
//{
// Debug.Log("BeatTime: " + f);
//}
float firstBeatTime = FindFirstBeatTime(beatTimes, predictedBeatTimeDiff, beatParams);
beat = new Beat(predictedBeatTimeDiff, firstBeatTime);
Debug.Log(beat);
}
return(beat);
}