public void Handle(SamplesReceivedEvent samples)
{
var start = samples.Start.TotalSeconds;
var end = start + ((double)samples.Data.Length / samples.WaveFormat.AverageBytesPerSecond);
var peaks = _peakProvider.Sample(samples.WaveFormat, samples.Data);
if (peaks.Any())
{
_events.PublishOnCurrentThread(new PeaksReceivedEvent(samples.Source, start, end, peaks, samples.CurrentAudioTime));
}
}
private WaveformData Generate(IWaveProviderEx audioStream)
{
var position = audioStream.Position;
var volume = audioStream.Volume;
var pan = audioStream.Pan;
audioStream.Position = 0;
audioStream.Volume = 1f;
audioStream.Pan = 0;
try
{
var stopWatch = Stopwatch.StartNew();
var peaks = new List <PeakInfo>();
var buffer = new byte[audioStream.WaveFormat.AverageBytesPerSecond];
int bytesRead;
do
{
bytesRead = audioStream.Read(buffer, 0, buffer.Length);
var data = bytesRead == buffer.Length ? buffer : buffer.Take(bytesRead).ToArray();
var p = _peakProvider.Sample(audioStream.WaveFormat, data);
peaks.AddRange(p);
} while (bytesRead > 0 && audioStream.Position < audioStream.Length);
var elapsed = stopWatch.Elapsed;
var mibPerSecond = audioStream.Length / elapsed.TotalSeconds / 1024 / 1024;
#if DEBUG
Trace.WriteLine($"Sampled '{audioStream.TotalTime}' of wave data in '{elapsed}' ({mibPerSecond:F1} MiB/sec).");
#endif
return(new WaveformData(audioStream.TotalTime, peaks));
}
finally
{
audioStream.Position = position;
audioStream.Volume = volume;
audioStream.Pan = pan;
}
}
