public MainViewModel()
{
_audioService = new AudioService();
MeasureCommand = new Command(async() =>
{
IsLoading = true;
Path = await _audioService.RecordSample(TimeSpan.FromSeconds(10));
var wav = new WavService(_path);
var movAvgData = wav.Data.Where((x, i) => i % 48 == 0).Select(x => (double)x).ToArray();
var peaksMovAvgData = movAvgData.FindPeaks();
// debug: Metadata = $"{nameof(peaksMovAvgData)}: {peaksMovAvgData.Length}";
const double treshold = 6450.0;
var beats = peaksMovAvgData.Where(p => movAvgData[p] > treshold).ToArray();
Metadata = $"BPM: {beats.Length * 3}"; // since 2 beats mean one heart beat & there are 6 10sec periods in one minute
DataCalculated?.Invoke(movAvgData);
IsLoading = false;
});
}
protected void RaiseDataCalculated(IEnumerable <Parameter> parameters)
{
DataCalculated?.Invoke(this, parameters);
}