static public bool Shift(byte[] waveData, float pitchShiftCoeff)
{
// pitchShiftCoeff: 0.5f - 2f
// 0.5f - на одну октаву ниже
// 2f - на одну октаву выше
WavePCMParser.WaveInfo waveInfo;
if (!WavePCMParser.GetWaveInfo(waveData, out waveInfo))
{
return(false);
}
// преобразования только для 16 бит
if (waveInfo.bytesPerSample != 2)
{
return(false);
}
float[][] channelsData = ConvertWaveDataToFloatArrays(waveData, ref waveInfo);
foreach (var channelData in channelsData)
{
PitchShifter.PitchShift(pitchShiftCoeff, waveInfo.samplesCount, 1024, 10, waveInfo.sampleRate, channelData);
}
ConvertFloatArraysToWaveData(waveData, ref waveInfo, channelsData);
return(true);
}
//+makeLower(): returns a string for a lower pitch version of the file
public String makeLower(String file, String newFile, float pitchShift)
{
// Read header, data and channels as separated data
// Normalized data stores. Store values in the format -1.0 to 1.0
byte[] waveheader = null;
byte[] wavedata = null;
int sampleRate = 0;
float[] in_data_l = null;
float[] in_data_r = null;
GetWaveData(file, out waveheader, out wavedata, out sampleRate, out in_data_l, out in_data_r);
//
// Apply Pitch Shifting
//
if (in_data_l != null)
{
PitchShifter.PitchShift(pitchShift, in_data_l.Length, (long)1024, (long)10, sampleRate, in_data_l);
}
if (in_data_r != null)
{
PitchShifter.PitchShift(pitchShift, in_data_r.Length, (long)1024, (long)10, sampleRate, in_data_r);
}
//
// Time to save the processed data
//
// Backup wave data
byte[] copydata = new byte[wavedata.Length];
Array.Copy(wavedata, copydata, wavedata.Length);
GetWaveData(in_data_l, in_data_r, ref wavedata);
// Save modified wavedata
string targetFilePath = newFile;
if (File.Exists(targetFilePath))
{
File.Delete(targetFilePath);
}
using (BinaryWriter writer = new BinaryWriter(File.OpenWrite(targetFilePath)))
{
writer.Write(waveheader);
writer.Write(wavedata);
}
return(newFile);
}
/// <summary>
/// Bake a new AudioClip from the original source with the given parameters
/// </summary>
/// <returns>The new AudioClip baked with the given parameters</returns>
public AudioClip Bake()
{
// Create a new AudioClip
AudioClip ajusted = AudioClip.Create("Footstep", source.samples, source.channels, source.frequency, false);
// Read the samples from the source clip
float[] samples = new float[source.samples];
source.GetData(samples, 0);
// Pitch the samples acording to the given pitch
Profiler.BeginSample("Bake single AudioClip");
PitchShifter.PitchShift(pitch, samples.Length, 32, 32, ajusted.frequency, samples);
Profiler.EndSample();
// Normalize the audio
AudioNormalizer.Normalize(samples);
// Write the ajusted samples to the new AudioClip
ajusted.SetData(samples, 0);
return(ajusted);
}