private void stop(object sender, RoutedEventArgs e)
{
if (!isRecording || this.lvSentences.SelectedItems.Count < 1)
{
return;
}
isRecording = false;
recorder.Close();
filewriter.Close();
int index = this.lvSentences.SelectedIndex;
lblRecording.Visibility = System.Windows.Visibility.Hidden;
Sentence sentence = (Sentence)this.lvSentences.SelectedItem;
loadLanguage(); // Called to refresh the sentence data of the current langugae
this.lvSentences.SelectedIndex = index;
wavProcessor processor = new wavProcessor();
int noiceLevel = (int)this.noiceLevelSlider.Value;
processor.StripSilence(sentence.fullPath, noiceLevel);
processor.ToneIn(sentence.fullPath);
processor.ToneOut(sentence.fullPath);
processor.SpeedUp(sentence.fullPath, (int)this.speedSlider.Value);
}
/// <summary>
/// Filter out silence or noise from start and end of wave file.
/// </summary>
/// <param name="strPath">Source wave file</param>
/// <param name="noiceLevel">Absolute value for noice threshold</param>
/// <returns>True/False</returns>
public bool StripSilence(string strPath, int noiceLevel)
{
if ((strPath == null) || (strPath == ""))
return false;
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath)) return false;
byte[] arrfile = GetWAVEData(strPath);
int startpos = 0;
int endpos = arrfile.Length - 1;
// Check for silence at start
for (int j = 0; isSilence(arrfile, j, noiceLevel); j += 20)
startpos = j;
// Allow room for tone-in buffer
int buffer = wain.SampleRate * (wain.BitsPerSample / 8) / 32; // 1/32 seconds lead time
startpos = startpos - buffer;
if (startpos < 0)
startpos = 0;
// Check for silence at end. No need to check tone out buffer
for (int k = arrfile.Length - buffer; (k >= 0) && (isSilence(arrfile, k, noiceLevel)); k -= 20)
endpos = k;
// Allow room for tone-out buffer
endpos = endpos + buffer;
if (endpos > arrfile.Length)
endpos = arrfile.Length - 2;
if (startpos >= endpos)
return false;
byte[] newarr = new byte[endpos - startpos];
for (int ni = 0, m = startpos; ni < newarr.Length; m++, ni++)
newarr[ni] = arrfile[m];
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(newarr, newarr.Length);
writer.Close();
return true;
}
/// <summary>
/// Speed up wav file to mimic Donald Duck
/// </summary>
/// <param name="strPath">Source wave</param>
/// <param name="speed">Speed between 0 and 19 </param>
/// <returns>True/False</returns>
public bool SpeedUp(string strPath, int speed)
{
if ((strPath == null) || (strPath == ""))
{
return(false);
}
if ((speed < 0) || (speed > 19))
{
return(false);
}
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath))
{
return(false);
}
byte[] arrfile = GetWAVEData(strPath);
byte[] newfile = new byte[arrfile.Length];
int skip = 21 - speed;
int j = 0;
for (int i = 0; i < arrfile.Length; i += 2)
{
if (skip > 20 || (((i / 2) % skip) != 0))
{
newfile[j] = arrfile[i];
newfile[j + 1] = arrfile[i + 1];
j += 2;
}
}
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(newfile, j);
writer.Close();
return(true);
}
/// <summary>
/// Tone out wav file
/// </summary>
/// <param name="strPath">Source wave</param>
/// <returns>True/False</returns>
public bool ToneOut(string strPath)
{
if ((strPath == null) || (strPath == ""))
{
return(false);
}
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath))
{
return(false);
}
byte[] arrfile = GetWAVEData(strPath);
// Calculate constants
int end = wain.Length;
int start = end - (wain.SampleRate * (wain.BitsPerSample / 8) / 16); // 1/16 seconds from end
int span = end - start;
//change volume
for (int j = start; j < arrfile.Length; j += 2)
{
short snd = ComplementToSigned(ref arrfile, j);
snd = Convert.ToInt16(snd * (end - j) / span);
byte[] newval = SignedToComplement(snd);
arrfile[j] = newval[0];
arrfile[j + 1] = newval[1];
}
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(arrfile, arrfile.Length);
writer.Close();
return(true);
}
/// <summary>
/// Filter out silence or noise from start and end of wave file.
/// </summary>
/// <param name="strPath">Source wave file</param>
/// <param name="noiceLevel">Absolute value for noice threshold</param>
/// <returns>True/False</returns>
public bool StripSilence(string strPath, int noiceLevel)
{
if ((strPath == null) || (strPath == ""))
{
return(false);
}
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath))
{
return(false);
}
byte[] arrfile = GetWAVEData(strPath);
int startpos = 0;
int endpos = arrfile.Length - 1;
// Check for silence at start
for (int j = 0; isSilence(arrfile, j, noiceLevel); j += 20)
{
startpos = j;
}
// Allow room for tone-in buffer
int buffer = wain.SampleRate * (wain.BitsPerSample / 8) / 32; // 1/32 seconds lead time
startpos = startpos - buffer;
if (startpos < 0)
{
startpos = 0;
}
// Check for silence at end. No need to check tone out buffer
for (int k = arrfile.Length - buffer; (k >= 0) && (isSilence(arrfile, k, noiceLevel)); k -= 20)
{
endpos = k;
}
// Allow room for tone-out buffer
endpos = endpos + buffer;
if (endpos > arrfile.Length)
{
endpos = arrfile.Length - 2;
}
if (startpos >= endpos)
{
return(false);
}
byte[] newarr = new byte[endpos - startpos];
for (int ni = 0, m = startpos; ni < newarr.Length; m++, ni++)
{
newarr[ni] = arrfile[m];
}
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(newarr, newarr.Length);
writer.Close();
return(true);
}
/// <summary>
/// Tone in wav file
/// </summary>
/// <param name="strPath">Source wave</param>
/// <returns>True/False</returns>
public bool ToneIn(string strPath)
{
if ((strPath == null) || (strPath == ""))
return false;
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath)) return false;
byte[] arrfile = GetWAVEData(strPath);
// Calculate constants
int start = 0;
int end = wain.SampleRate * (wain.BitsPerSample / 8) / 16; // 1/16 seconds
int span = end - start;
//change volume
for (int j = start; j < end; j += 2)
{
short snd = ComplementToSigned(ref arrfile, j);
snd = Convert.ToInt16(snd * (j / span));
byte[] newval = SignedToComplement(snd);
arrfile[j] = newval[0];
arrfile[j + 1] = newval[1];
}
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(arrfile, arrfile.Length);
writer.Close();
return true;
}
/// <summary>
/// Speed up wav file to mimic Donald Duck
/// </summary>
/// <param name="strPath">Source wave</param>
/// <param name="speed">Speed between 0 and 19 </param>
/// <returns>True/False</returns>
public bool SpeedUp(string strPath, int speed)
{
if ((strPath == null) || (strPath == ""))
return false;
if ((speed < 0) || (speed > 19))
return false;
// Read from file
wavProcessor wain = new wavProcessor();
if (!wain.WaveHeaderIN(@strPath)) return false;
byte[] arrfile = GetWAVEData(strPath);
byte[] newfile = new byte[arrfile.Length];
int skip = 21-speed;
int j = 0;
for (int i = 0; i < arrfile.Length; i += 2)
{
if (skip > 20 || (((i/2) % skip) != 0))
{
newfile[j] = arrfile[i];
newfile[j + 1] = arrfile[i + 1];
j += 2;
}
}
// write file back
WavFileWriter writer = new WavFileWriter(@strPath, wain.SampleRate, wain.BitsPerSample, wain.Channels);
writer.Write(newfile, j);
writer.Close();
return true;
}