Issue when using two devices: Windows doesn't play sounds

[pub00515]

Hi guys,

I'm using NAudio to create an intercom application. Recently, I've have been getting complaints from users that, when multiple devices are configured, audio stops working. I was able to replicate the situation on my side using 2 USB headsets. In my case, when the snippet below is run, the second device stops working in Windows alltogether. Only when I exit the application, Windows is able to play back sounds on that device. And it's always the second device where Play() is called. Does anyone have a clue as to what could be the root cause here?

` var headset1 = WasapiHelper.GetDeviceById("{0.0.0.00000000}.{e6802322-a556-4327-9be1-0a4bec8ab9fd}", NAudio.CoreAudioApi.DataFlow.Render, NAudio.CoreAudioApi.Role.Console);
var headset2 = WasapiHelper.GetDeviceById("{0.0.0.00000000}.{f33d86c7-7071-44cc-b8e0-d8190341af67}", NAudio.CoreAudioApi.DataFlow.Render, NAudio.CoreAudioApi.Role.Console);

            var mixer1 = new TestWaveProvider();
            var mixer2 = new TestWaveProvider();

            var _waveOut1 = new WasapiOut(headset1, AudioClientShareMode.Shared, false, 50);
            _waveOut1.PlaybackStopped += _waveOut1_PlaybackStopped;
            _waveOut1.Init(mixer1);
            _waveOut1.Play();

            var _waveOut2 = new WasapiOut(headset2, AudioClientShareMode.Shared, false, 50);
            _waveOut2.PlaybackStopped += _waveOut2_PlaybackStopped;
            _waveOut2.Init(mixer2);
            _waveOut2.Play();

`

And the TestWaveProvider looks like this:

internal class TestWaveProvider : IWaveProvider
    {
        public WaveFormat WaveFormat { get; } = new WaveFormat(48000, 32, 2);

        public int Read(byte[] buffer, int offset, int count)
        {
            Debug.WriteLine("Count: " + count.ToString());

            return Math.Min(4, buffer.Length - offset);

        }
    }

Many thanks
Mark