public static void ProcessAudioWave(string fileIn, string fileOut, float newTempo = 1, float newPitch = 1, float newRate = 1)
{
WaveFileReader reader = new WaveFileReader(fileIn);
int numChannels = reader.WaveFormat.Channels;
if (numChannels > 2)
throw new Exception("SoundTouch supports only mono or stereo.");
int sampleRate = reader.WaveFormat.SampleRate;
int bitPerSample = reader.WaveFormat.BitsPerSample;
const int BUFFER_SIZE = 1024 * 16;
SoundStretcher stretcher = new SoundStretcher(sampleRate, numChannels);
WaveFileWriter writer = new WaveFileWriter(fileOut, new WaveFormat(sampleRate, 16, numChannels));
stretcher.Tempo = newTempo;
stretcher.Pitch = newPitch;
stretcher.Rate = newRate;
byte[] buffer = new byte[BUFFER_SIZE];
short[] buffer2 = null;
if (bitPerSample != 16 && bitPerSample != 8)
{
throw new Exception("Not implemented yet.");
}
if (bitPerSample == 8)
{
buffer2 = new short[BUFFER_SIZE];
}
bool finished = false;
while (true)
{
int bytesRead = 0;
if (!finished)
{
bytesRead = reader.Read(buffer, 0, BUFFER_SIZE);
if (bytesRead == 0)
{
finished = true;
stretcher.Flush();
}
else
{
if (bitPerSample == 16)
{
stretcher.PutSamplesFromBuffer(buffer, 0, bytesRead);
}
else if (bitPerSample == 8)
{
for (int i = 0; i < BUFFER_SIZE; i++)
buffer2[i] = (short)((buffer[i] - 128) * 256);
stretcher.PutSamples(buffer2);
}
}
}
bytesRead = stretcher.ReceiveSamplesToBuffer(buffer, 0, BUFFER_SIZE);
writer.Write(buffer, 0, bytesRead);
if (finished && bytesRead == 0)
break;
}
reader.Close();
writer.Close();
}
void changePitchNTempo(String fileName, String fileOut, float newTempo, float newPitch)
{
WaveFileReader reader = new WaveFileReader(fileName);
int numChannels = reader.WaveFormat.Channels;
if (numChannels > 2)
{
throw new Exception("SoundTouch supports only mono or stereo.");
}
int sampleRate = reader.WaveFormat.SampleRate;
int bitPerSample = reader.WaveFormat.BitsPerSample;
const int BUFFER_SIZE = 1024 * 16;
SoundStretcher stretcher = new SoundStretcher(sampleRate, numChannels);
WaveFileWriter writer = new WaveFileWriter(fileOut, new WaveFormat(sampleRate, 16, numChannels));
stretcher.Tempo = newTempo;
stretcher.Pitch = newPitch;
byte[] buffer = new byte[BUFFER_SIZE];
short[] buffer2 = null;
if (bitPerSample != 16 && bitPerSample != 8)
{
throw new Exception("Not implemented yet.");
}
if (bitPerSample == 8)
{
buffer2 = new short[BUFFER_SIZE];
}
bool finished = false;
while (true)
{
int bytesRead = 0;
if (!finished)
{
bytesRead = reader.Read(buffer, 0, BUFFER_SIZE);
if (bytesRead == 0)
{
finished = true;
stretcher.Flush();
}
else
{
if (bitPerSample == 16)
{
stretcher.PutSamplesFromBuffer(buffer, 0, bytesRead);
}
else if (bitPerSample == 8)
{
for (int i = 0; i < BUFFER_SIZE; i++)
{
buffer2[i] = (short)((buffer[i] - 128) * 256);
}
stretcher.PutSamples(buffer2);
}
}
}
bytesRead = stretcher.ReceiveSamplesToBuffer(buffer, 0, BUFFER_SIZE);
writer.Write(buffer, 0, bytesRead);
if (finished && bytesRead == 0)
{
break;
}
}
reader.Close();
writer.Close();
}
private static byte[] SlowAudio(byte[] mp3, float newTempo = 0.95f, float newPitch = 1.2f, float newRate = .8f)
{
const int BUFFER_SIZE = 1024 * 16;
byte[] buffer = new byte[BUFFER_SIZE];
var format = new WaveFormat();
try
{
using (var output = new MemoryStream())
{
File.Delete("temp.wav");
File.Delete("temp2.wav");
using (var mp3Stream = new MemoryStream(mp3))
using (Mp3FileReader reader = new Mp3FileReader(mp3Stream))
{
WaveFileWriter.CreateWaveFile("temp.wav", reader);
}
using (WaveFileReader reader = new WaveFileReader("temp.wav"))
{
int numChannels = reader.WaveFormat.Channels;
if (numChannels > 2)
throw new Exception("SoundTouch supports only mono or stereo.");
int sampleRate = reader.WaveFormat.SampleRate;
int bitPerSample = reader.WaveFormat.BitsPerSample;
SoundStretcher stretcher = new SoundStretcher(sampleRate, numChannels);
var writer = new NAudio.Lame.LameMP3FileWriter(output, new WaveFormat(sampleRate, 16, numChannels), 128);
stretcher.Tempo = newTempo;
stretcher.Pitch = newPitch;
stretcher.Rate = newRate;
short[] buffer2 = null;
if (bitPerSample != 16 && bitPerSample != 8)
{
throw new Exception("Not implemented yet.");
}
if (bitPerSample == 8)
{
buffer2 = new short[BUFFER_SIZE];
}
bool finished = false;
while (true)
{
int bytesRead = 0;
if (!finished)
{
bytesRead = reader.Read(buffer, 0, BUFFER_SIZE);
if (bytesRead == 0)
{
finished = true;
stretcher.Flush();
}
else
{
if (bitPerSample == 16)
{
stretcher.PutSamplesFromBuffer(buffer, 0, bytesRead);
}
else if (bitPerSample == 8)
{
for (int i = 0; i < BUFFER_SIZE; i++)
buffer2[i] = (short)((buffer[i] - 128) * 256);
stretcher.PutSamples(buffer2);
}
}
}
bytesRead = stretcher.ReceiveSamplesToBuffer(buffer, 0, BUFFER_SIZE);
writer.Write(buffer, 0, bytesRead);
if (finished && bytesRead == 0)
break;
}
reader.Close();
writer.Close();
}
return output.ToArray();
}
}
finally
{
File.Delete("temp.wav");
File.Delete("temp2.wav");
}
/////////////////////////////
}
public byte[] GetRatedData(byte[] data, double rate, WaveFormat wf)
{
MemoryStream memRead = new MemoryStream(data);
WaveFileReader reader = new WaveFileReader(memRead);
int numChannels = wf.Channels;
if (numChannels > 2)
{
throw new Exception("SoundTouch supports only mono or stereo.");
}
int sampleRate = wf.SampleRate;
int bitPerSample = wf.BitsPerSample;
const int BUFFER_SIZE = 1024 * 16;
SoundStretcher stretcher = new SoundStretcher(sampleRate, numChannels);
MemoryStream memWrite = new MemoryStream();
WaveFileWriter writer = new WaveFileWriter(memWrite, new WaveFormat(sampleRate, 16, numChannels));
stretcher.Tempo = (float)rate;
byte[] buffer = new byte[BUFFER_SIZE];
short[] buffer2 = null;
if (bitPerSample != 16 && bitPerSample != 8)
{
throw new Exception("Not implemented yet.");
}
if (bitPerSample == 8)
{
buffer2 = new short[BUFFER_SIZE];
}
bool finished = false;
while (true)
{
int bytesRead = 0;
if (!finished)
{
bytesRead = reader.Read(buffer, 0, BUFFER_SIZE);
if (bytesRead == 0)
{
finished = true;
stretcher.Flush();
}
else
{
if (bitPerSample == 16)
{
stretcher.PutSamplesFromBuffer(buffer, 0, bytesRead);
}
else if (bitPerSample == 8)
{
for (int i = 0; i < BUFFER_SIZE; i++)
{
buffer2[i] = (short)((buffer[i] - 128) * 256);
}
stretcher.PutSamples(buffer2);
}
}
}
bytesRead = stretcher.ReceiveSamplesToBuffer(buffer, 0, BUFFER_SIZE);
writer.Write(buffer, 0, bytesRead);
if (finished && bytesRead == 0)
{
break;
}
}
reader.Close();
writer.Close();
return(memWrite.ToArray());
}
