Commented Unassigned: Dictation recorder hangs on waveInClose [16501]

Our dictation software hangs on NAudio call as described below. This has been tried to get fixed for ages but no luck. Hope you can help!


Hang happens in WaveIn.cs in CloseWaveInDevice() function, line 336 WaveInterop.waveInClose(waveInHandle), that row is in bold below.

private void CloseWaveInDevice()
{

if (waveInHandle == IntPtr.Zero) return;
_logger.Log(LogLevel.Debug, () => "close wavein");

MmException.Try(WaveInterop.waveInStop(waveInHandle), "waveInStop");

MmException.Try(WaveInterop.waveInReset(waveInHandle), "waveInReset");

if (buffers != null)
{
_logger.Log(LogLevel.Debug, () => "close wavein, buffers=" + buffers.Length.ToString());
for (int n = 0; n < buffers.Length; n++)
{
_logger.Log(LogLevel.Debug, () => "buffers[" + n + "] dispose call");
buffers[n].Dispose();
_logger.Log(LogLevel.Debug, () => "buffers[" + n + "] disposed");
}
buffers = null;
}
_logger.Log(LogLevel.Debug, () => "buffers disposed, try to close waveIn");
var result = WaveInterop.waveInClose(waveInHandle);
_logger.Log(LogLevel.Debug, () => "waveInClose result: " + result.ToString());

waveInHandle = IntPtr.Zero;
// _logger.Log(LogLevel.Debug, () => "close wavein method end");
}


WaveInClose is called every time recording is paused to control recording led on Olympus DR-2X00 mic.

waveInClose is from winmm library ->
[DllImport("winmm.dll")]
public static extern MmResult waveInClose(IntPtr hWaveIn);

msdn -> https://msdn.microsoft.com/en-us/library/dd743840(v=vs.85).aspx

Problem is that it doesn't return error code -> it just never returns from this function in this case.

attached is a debug log from the software. It hangs on the last row.

-Juha

Comments: Ok, it is called when user clicks (actually slides) a button of professional dictation usb-recorder, Olympus or Philips. There are these situations when hanging does not happen even with desktop which usually have the issue: 1. using generic audio for recording 2. running the app in similar Windows image but in top of Virtualbox (just a test case). Do you still think there could be issue with disposing before recording stop?