/// <summary>
/// Starts to build a waveform of the morse code of 'word'
/// </summary>
/// <param name="word">A string to convert to a morse code WAV</param>
/// <param name="callback">A callback that is called when the WAV is ready</param>
/// <returns></returns>
public IAsyncResult StartBuildAsync(String word, AsyncCallback callback)
{
BuildWaverformAsync asyncResult = new BuildWaverformAsync(word, callback);
WaitCallback cb = new WaitCallback(MakeWaveform);
if (System.Threading.ThreadPool.QueueUserWorkItem(cb, asyncResult))
{
}
return(asyncResult);
}
private void MakeWaveform(object state)
{
BuildWaverformAsync buildInfo = (BuildWaverformAsync)state;
List <Int16[]> soundsList = new List <short[]>();
_toneGenerator.Update();
foreach (Char c in buildInfo.Word)
{
String morse = MorseInfo.ToMorse(c);
bool first = true;
foreach (Char d in morse)
{
if (first)
{
first = false;
}
else
{
soundsList.Add(_toneGenerator.DotSpaceWaveform);
}
switch (d)
{
case '.':
soundsList.Add(_toneGenerator.DotToneWaveform);
break;
case '-':
soundsList.Add(_toneGenerator.DashToneWaveform);
break;
case ' ':
soundsList.Add(_toneGenerator.WordSpaceWaveform);
break;
}
}
soundsList.Add(_toneGenerator.LetterSpaceWaveform);
// Farnsworth timing
if (_toneGenerator.FarnsworthWPM < _toneGenerator.WPM)
{
soundsList.Add(_toneGenerator.FarnsworthSpacingWaveform(c));
}
}
soundsList.Add(_toneGenerator.WordSpaceWaveform);
WaveStream stream = new WaveStream(buildInfo.Word, soundsList, ToneGenerator.SAMPLES_PER_SECOND, _toneGenerator.SamplesPerCycle);
buildInfo.SetWaveform(stream);
buildInfo.Callback();
buildInfo.TriggerWaitHandle();
}
