/// <summary>Creates a new instance of LiveAudioDtmfAnalyzer.</summary>
/// <param name="waveIn">The audio data source.</param>
/// <param name="forceMono">Indicates whether the audio data should be converted to mono
/// first. Default is true.</param>
public LiveAudioDtmfAnalyzer(IWaveIn waveIn, bool forceMono = true)
{
this.waveIn = waveIn;
var config = new DetectorConfig();
dtmfAudio = DtmfAudio.CreateFrom(new StreamingSampleSource(config, Buffer(waveIn), forceMono), config);
}
/// <summary>Reads a WaveStream and enumerates all present DTMF tones.</summary>
/// <remarks>By default this method forces a mono conversion by averaging all audio channels first. Turn it off with the
/// forceMono flag in order to analyze each channel separately.</remarks>
/// <param name="waveFile">The audio data to analyze.</param>
/// <param name="forceMono">Indicates whether the audio data should be converted to mono first. Default is true.</param>
/// <returns>All detected DTMF tones along with their positions (i.e. audio channel, start time, and duration).</returns>
public static IEnumerable <DtmfOccurence> DtmfTones(this WaveStream waveFile, bool forceMono = true)
{
var config = new DetectorConfig();
var dtmfAudio = DtmfAudio.CreateFrom(new StaticSampleSource(config, waveFile, forceMono), config);
var detectedTones = new Queue <DtmfOccurence>();
while (detectedTones.Any() || detectedTones.AddNextFrom(dtmfAudio, waveFile))
{
if (detectedTones.Any())
{
yield return(detectedTones.Dequeue());
}
}
// Yield any tones that might have been cut off by EOF.
foreach (var tone in detectedTones)
{
yield return(tone);
}
}
public static bool AddNextFrom(this Queue <DtmfOccurence> detectedTones, DtmfAudio dtmfAudio, WaveStream waveFile)
{
return(dtmfAudio.Forward(
(channel, tone) => waveFile.CurrentTime,
(channel, start, tone) => detectedTones.Enqueue(new DtmfOccurence(tone, channel, start, waveFile.CurrentTime - start))));
}
