I'm attempting to route microphone audio into the speakers in NAudio, using ASIO drivers. I have been successful in the NAudio demo project. Copying this code over to a different project (XNA, if relevant) is causing a COMException every time. Here is the method I wrote:
[STAThread]
void InitAsio()
{
if (this.asioOut != null &&
(this.asioOut.DriverName != "ASIO4ALL v2" ||
this.asioOut.ChannelOffset != 0))
{
this.asioOut.AudioAvailable -= asioOut_AudioAvailable;
this.asioOut.Dispose();
this.asioOut = null;
}
// create wave input from mic
// create device if necessary
if (this.asioOut == null)
{
this.asioOut = new AsioOut();
BufferedWaveProvider wavprov = new BufferedWaveProvider(new WaveFormat(44100, 1));
this.asioOut.InputChannelOffset = 0;
this.asioOut.InitRecordAndPlayback(wavprov, 1, 44100);
this.asioOut.AudioAvailable += asioOut_AudioAvailable;
}
//this.fileName = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString() + ".wav");
//this.writer = new WaveFileWriter(fileName, new WaveFormat(44100, recordChannelCount));
this.asioOut.Play();
}
Every time, this method fails in AsioDriver.cs:
int hresult = CoCreateInstance(ref ASIOGuid, IntPtr.Zero, CLSCTX_INPROC_SERVER, ref ASIOGuid, out pASIOComObject);
if ( hresult != 0 )
{
throw new COMException("Unable to instantiate ASIO. Check if STAThread is set",hresult);
}
I have no idea what's happening and why. Same code works in the NAudio demo project. Any ideas?
