private async void Open_Click(object sender, RoutedEventArgs e)
{
var ofn = new OpenFileDialog {Filter = CodecFactory.SupportedFilesFilterEn};
if (ofn.ShowDialog() == true)
{
_soundOut.Stop();
if (_notificationSource != null)
_notificationSource.Dispose();
var source = CodecFactory.Instance.GetCodec(ofn.FileName);
//since the mediafoundationdecoder isn't really accurate what position and length concerns
//read the whole file into a cache
if (source is MediaFoundationDecoder)
{
if (source.Length < 10485760) //10MB
{
source = new CachedSoundSource(source);
}
else
{
Stopwatch stopwatch = Stopwatch.StartNew();
source = new FileCachedSoundSource(source);
stopwatch.Stop();
Debug.WriteLine(stopwatch.Elapsed.ToString());
}
}
source.Position = 0;
//load the waveform
await LoadWaveformsAsync(source);
source.Position = 0;
_sampleSource = source.ToSampleSource();
_notificationSource = new NotificationSource(_sampleSource) {Interval = 100};
_notificationSource.BlockRead += (o, args) => { UpdatePosition(); };
_soundOut.Initialize(_notificationSource.ToWaveSource());
_soundOut.Play();
}
}
public void ThrowsInvalidCallerThread()
{
Exception exception = null;
using (var source = new NotificationSource(GetLoopingWaveSource().ToSampleSource()))
{
using (var waitHandle = new ManualResetEvent(false))
{
_soundOut.Initialize(source.ToWaveSource());
//the play method sometimes won't cause an InvalidOperationException
//for example the waveout class will read from the source which fires up the BlockRead event BUT not on the playbackthread.
_soundOut.Play();
source.BlockRead += (s, e) =>
{
try
{
_soundOut.Pause(); //hopefully throws InvalidOperationException
}
catch (InvalidOperationException ex)
{
exception = ex;
}
finally
{
// ReSharper disable once AccessToDisposedClosure
waitHandle.Set();
}
};
waitHandle.WaitOne();
_soundOut.Stop();
}
}
if (exception != null)
throw exception;
}