/// <summary>
/// Plays the given sequence of Morse symbols using the internal WaveGenerator module. This "queues"
/// audio to play, rather than relying on Thread.Sleep to gap the DITs/DAHs (symbols) from each other.
/// </summary>
/// <param name="morseStream">The sequence of MorseSymbol items to be played.</param>
/// <param name="cancelToken">Tracks whether or not this operation should be cancelled.</param>
/// <see cref="MorseSymbol"/>
/// <see cref="WaveGenerator"/>
public void PlayWaveStream(List <MorseSymbol> morseStream, CancellationToken cancelToken)
{
// First, get the audio constructed.
var wavFormat = new WaveAudioFormat(16000, 16, 1); //doesn't need to be the most high-def sound
var wavType = WaveGenerator.WaveType.SINE; //always a SINE wave (for now; configurable later)
var streamSequence = new List <WaveSample>(); //container for the resulting stream of samples
streamSequence.Add(new WaveSample(wavFormat, 0)); //initialize the stream with at least ONE empty sample
////Loading icon??
foreach (MorseSymbol sym in morseStream)
{
if (cancelToken != null && cancelToken.IsCancellationRequested)
{
return;
}
if (sym.hasSound())
{
WaveAudioTools.AppendSamples(
ref streamSequence,
(100.0, WaveGenerator.CreateNewWave(wavFormat, wavType, this.Gain * 100.0, sym.getDuration() / 1000.0, this.Frequency))
);
}
else
{
WaveAudioTools.AppendSamples(
ref streamSequence,
(100.0, WaveGenerator.CreateEmptySpace(wavFormat, sym.getDuration() / 1000.0))
);
}
}
// Construct the output stream in WAV format.
using var finalStream = new WaveStream(streamSequence);
////Release loading icon??
// Then, play the stream, while at the same time updating the text stream to sync as
// best as possible to the currently-playing audio.
// Define a lambda of sorts for updating the live text view for transmissions.
Action <MorseSymbol> updateTextStream = s => {
Program.mainForm.Invoke((System.Windows.Forms.MethodInvoker) delegate {
Program.txLiveView.AppendText(s.getRepresentation());
});
};
// Construct the player.
using var queuedStream = new System.IO.MemoryStream(finalStream.GetRawWaveStream());
using var mediaPlayer = new System.Media.SoundPlayer(queuedStream);
//...and...... GO!
mediaPlayer.Play();
int infiniteLoopPrevention = 0;
// Give the player 2s to load the stream.
while (!mediaPlayer.IsLoadCompleted && infiniteLoopPrevention < 100)
{
if (cancelToken != null && cancelToken.IsCancellationRequested)
{
mediaPlayer.Stop();
mediaPlayer.Dispose();
break;
}
Thread.Sleep(20);
infiniteLoopPrevention++;
}
// During stream playback, send out the symbols.
for (int index = 0; index < morseStream.Count; index++)
{
var sym = morseStream[index];
if (cancelToken != null && cancelToken.IsCancellationRequested)
{
mediaPlayer.Stop();
mediaPlayer.Dispose();
break;
}
//Thread.Sleep((int)sym.getDuration());
Task.Delay((int)sym.getDuration()).Wait();
updateTextStream(sym);
// Handle progress bar updates.
Program.mainForm.Invoke((System.Windows.Forms.MethodInvoker) delegate {
try { Program.pbTXProgress.Value = (((index * 100) / morseStream.Count) + 1); } catch { }
});
}
}
