/// <summary>
/// The pitch was detected - add the record
/// </summary>
/// <param name="pitch"></param>
private void AddPitchRecord(float pitch)
{
var midiNote = 0;
var midiCents = 0;
MusicalTemperament.PitchToMidiNote(pitch, out midiNote, out midiCents);
var record = new PitchRecord();
record.RecordIndex = m_curPitchIndex;
record.Pitch = pitch;
record.MidiNote = midiNote;
record.MidiCents = midiCents;
m_curPitchRecord = record;
if (m_recordPitchRecords)
{
if (m_pitchRecordHistorySize > 0 && m_pitchRecords.Count >= m_pitchRecordHistorySize)
{
m_pitchRecords.RemoveAt(0);
}
m_pitchRecords.Add(record);
}
if (PitchDetected != null)
{
PitchDetected(this, record);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="fSampleRate"></param>
/// <param name="minFreq"></param>
/// <param name="maxFreq"></param>
/// <param name="fFreqStep"></param>
public PitchDsp(double sampleRate, float minPitch, float maxPitch, float detectLevelThreshold)
{
m_sampleRate = sampleRate;
m_minPitch = minPitch;
m_maxPitch = maxPitch;
m_detectLevelThreshold = detectLevelThreshold;
m_minNote = (int)(MusicalTemperament.PitchToMidiNote(m_minPitch) + 0.5f) + 2;
m_maxNote = (int)(MusicalTemperament.PitchToMidiNote(m_maxPitch) + 0.5f) - 2;
m_blockLen44 = (int)(m_sampleRate / m_minPitch + 0.5f);
m_blockLen34 = (m_blockLen44 * 3) / 4;
m_blockLen24 = m_blockLen44 / 2;
m_blockLen14 = m_blockLen44 / 4;
m_numCourseSteps = (int)((Math.Log((double)m_maxPitch / (double)m_minPitch) / Math.Log(2.0)) * kCourseOctaveSteps + 0.5) + 3;
m_pCourseFreqOffset = new float[m_numCourseSteps + 10000];
m_pCourseFreq = new float[m_numCourseSteps + 10000];
m_detectCurve = new float[m_numCourseSteps];
var freqStep = 1.0 / Math.Pow(2.0, 1.0 / kCourseOctaveSteps);
var curFreq = m_maxPitch / freqStep;
// frequency is stored from high to low
for (int idx = 0; idx < m_numCourseSteps; idx++)
{
m_pCourseFreq[idx] = (float)curFreq;
m_pCourseFreqOffset[idx] = (float)(m_sampleRate / curFreq);
curFreq *= freqStep;
}
for (int idx = 0; idx < kScanHiSize; idx++)
{
m_scanHiOffset[idx] = (float)Math.Pow(kScanHiFreqStep, (kScanHiSize / 2) - idx);
}
}
