public void LoadAudioFile(string fileName)
{
byte[] buffer;
int inc;
double totalSec;
string extension = Path.GetExtension(fileName);
WaveStream stream = null;
switch (extension)
{
case ".wav":
case ".wave":
stream = new WaveFileReader(fileName);
break;
case ".mp3":
stream = new Mp3FileReader(fileName);
break;
}
if (stream != null)
{
using (stream)
{
BitsPerSample = stream.WaveFormat.BitsPerSample;
ChannelCount = stream.WaveFormat.Channels;
inc = ChannelCount * BitsPerSample / 8;
totalSec = stream.TotalTime.TotalSeconds;
SampleRate = stream.WaveFormat.SampleRate;
buffer = new byte[stream.Length];
stream.Read(buffer, 0, buffer.Length);
}
PcmData = new float[(buffer.Length + inc - 1) / inc];
if (BitsPerSample == 8)
{
for (int i = 0; i < PcmData.Length; i++)
{
PcmData[i] = (float)buffer[i * inc] / 127;
}
}
else if (BitsPerSample == 16)
{
for (int i = 0; i < PcmData.Length; i++)
{
PcmData[i] = (float)(short)((buffer[i * inc + 1] << 8) + buffer[i * inc]) / short.MaxValue;
}
}
_pitchTracker = new PitchTracker();
_pitchTracker.PitchRecordsPerSecond = 1 / PieceLengthInMSec;
_pitchTracker.SampleRate = SampleRate;
_pitchTracker.RecordPitchRecords = true;
_pitchTracker.DetectLevelThreshold = (float)DetectLevelThreshold;
}
}
public void InitRealtimeMode(int channelCount, int bitsPerSample, int sampleRate, int sampleLengthMSec, PitchDetectedHandler handler)
{
ChannelCount = channelCount;
BitsPerSample = bitsPerSample;
PieceLengthInMSec = sampleLengthMSec;
_pitchTracker = new PitchTracker();
_pitchTracker.PitchRecordsPerSecond = 1000.0 / PieceLengthInMSec;
_pitchTracker.SampleRate = sampleRate;
_pitchTracker.RecordPitchRecords = true;
_pitchTracker.DetectLevelThreshold = (float)DetectLevelThreshold;
_pitchTracker.PitchDetected += handler;
}
