public static IdolWaveNote ProcessData(short[] data, int sampleRate)
{
double[] x = new double[data.Length];
for (int i = 0; i < x.Length; i++)
{
x[i] = data[i];
}
double[] spectr = IdolFFTAlgorithm.Calculate(x);
int minSpectr = (int)(MinFreq * spectr.Length / sampleRate / magicNumber) + 1;
int index = 1;
double max = spectr[index];
int usefullMaxSpectr = Math.Min(spectr.Length,
(int)(MaxFreq * spectr.Length / sampleRate / magicNumber) + 1);
//Console.WriteLine(usefullMaxSpectr + " " + spectr.Length + " " + usefullMaxSpectr * sampleRate / spectr.Length);
//Console.WriteLine("= " + max);
for (int i = index; i < usefullMaxSpectr; i++)
{
if (max < spectr[i])
{
max = spectr[i]; index = i;
}
}
//Console.WriteLine("- " + max + " " + index);
double freq = (double) magicNumber * sampleRate * index / spectr.Length;
if (freq < MinFreq) freq = 0;
IdolWaveNote waveNote = new IdolWaveNote();
waveNote.freq = freq;
waveNote.max = max;
return waveNote;
//return freq;
}
private static void GetNotes(int startIdx, int endIdx, IdolWave _wave, List<IdolWaveNote> result)
{
IdolWaveNote waveNote;
//short[] waveShortBuffer = new short[bufferSize];
//float timeLength = 0.4f;
//short[] waveShortBuffer = new short[(int)(_wave.ByteRate / 2 * timeLength)];
//byte[] waveByteBuffer = new byte[(int)(_wave.ByteRate / 2 * timeLength)];
byte[] waveByteBuffer = new byte[bufferSize];
int waveIdx = startIdx;
int bufferIdx = 0;
AudioFrame audioFrame = new AudioFrame(false);
double MinFreq = 80;
double MaxFreq = 800;
int defaultIdx = -99;
int batchNo = 0;
while (waveIdx < endIdx)
{
batchNo++;
bufferIdx = 0;
/************************************************/
//while (waveIdx < endIdx &&
// bufferIdx < waveShortBuffer.Length)
//{
// waveShortBuffer[bufferIdx] = (Int16)swapByteOrder(BitConverter.ToUInt16(_wave.Data, waveIdx));
// waveIdx += _wave.NumChannels;
// bufferIdx++;
//}
//waveNote = IdolSoundAnalyzer.ProcessData(waveShortBuffer, _wave.SampleRate);
//IdolSoundAnalyzer.FindClosestNote((int)Math.Round(waveNote.freq), out closestFreq, out waveNote.NoteIdx, out waveNote.NoteName);
/************************************************/
while (waveIdx < endIdx &&
bufferIdx < waveByteBuffer.Length)
{
waveByteBuffer[bufferIdx] = _wave.Data[waveIdx];
waveIdx ++;
bufferIdx++;
}
audioFrame.ProcessMono(ref waveByteBuffer);
int fftBufferLength = audioFrame._fftLeft.Length;
int minSpectr = (int)(MinFreq * (fftBufferLength * 2) / _wave.SampleRate) + 1;
int index = minSpectr;
double max = audioFrame._fftLeft[index];
int usefullMaxSpectr = Math.Min((fftBufferLength * 2),
(int)(MaxFreq * (fftBufferLength * 2) / _wave.SampleRate) + 1);
List<Peak> peakList = new List<Peak>();
double current = max;
double last = max;
double last2 = max;
for (int i = index; i < usefullMaxSpectr; i++)
{
last2 = last;
last = current;
current = audioFrame._fftLeft[i];
if (last > 51)
{
if (last > last2 && last > current)
{
Peak peak = new Peak();
peak.Index = i - 1;
peak.Freq = _wave.SampleRate * (i - 1) / (audioFrame._fftLeft.Length * 2);
peak.Amp = audioFrame._fftLeft[i - 1];
peakList.Add(peak);
}
}
if (max < audioFrame._fftLeft[i])
{
max = audioFrame._fftLeft[i]; index = i;
}
}
double freq = 0;
if (peakList.Count > 0)
{
int i = 0;
bool found = false;
while (i < peakList.Count && !found)
{
if (peakList[i].Amp >= 58)
{
index = peakList[i].Index;
found = true;
}
else i++;
}
if (!found)
{
index = peakList[0].Index;
}
else
{
for (int j = 0; j < i; j++)
{
double ratio = peakList[i].Freq / peakList[j].Freq;
if (ratio >= 1 && (ratio % 1.0f < 0.1f || ratio % 1.0f > 0.9f))
{
index = peakList[j].Index;
if (peakList[j].Freq == 93)
{
peakList[j].Freq *= 1;
}
break;
}
}
}
}
freq = _wave.SampleRate * index / (audioFrame._fftLeft.Length * 2);
if (freq < MinFreq) freq = 0;
waveNote = new IdolWaveNote();
waveNote.freq = freq;
waveNote.max = audioFrame._fftLeft[index];
IdolSoundAnalyzer.FindClosestNote((int)Math.Round(waveNote.freq), out closestFreq, out waveNote.NoteIdx, out waveNote.NoteName);
/************************************************/
result.Add(waveNote);
}
}