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POC#: Unity3D and NAudio EnumerateAudioEndPoints throws NullReferenceException
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2012-02-17T04:00:28.650
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2012-02-17T05:44:51.870
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2012-02-17T05:44:51.870
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I'm trying to use the NAudio library in a Unity3D project. When calling MMDeviceEnumerator.EnumerateAudioEndPoints, a NullReferenceException is thrown. This does not occur in a Visual Studio project targeting .NET 2.0. The enumerator itself is not null. That method wraps a call to IMMDeviceEnumerator.EnumAudioEndpoints, which is what's directly throwing this exception (I moved a bunch of code from NAudio into my Unity3D project). The only real difference here is that it's running inside a Unity3D game, rather than a standard Visual Studio application. What could be causing this? Please help. Update: My code that throws (second line): <pre><code>MMDeviceEnumerator enumerator = new MMDeviceEnumerator(); MMDeviceCollection collection = enumerator.EnumerateAudioEndPoints(DataFlow.All, DeviceState.All); </code></pre> NAudio code that throws (second line of method): <pre><code>public MMDeviceCollection EnumerateAudioEndPoints(DataFlow dataFlow, DeviceState dwStateMask) { IMMDeviceCollection result; Marshal.ThrowExceptionForHR(_realEnumerator.EnumAudioEndpoints(dataFlow, dwStateMask, out result)); return new MMDeviceCollection(result); } </code></pre> Update x2: In the constructor for MMDeviceEnumerator in NAudio: <pre><code>_realEnumerator = new MMDeviceEnumeratorComObject() as IMMDeviceEnumerator; </code></pre> The new com object is not null, but when casting, it becomes null. Again, this works in a Visual Studio project, but not Unity3D. Here's the definitions of each (from the NAudio source): <pre><code>[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] class MMDeviceEnumeratorComObject { } </code></pre> and <pre><code>[Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] interface IMMDeviceEnumerator { int EnumAudioEndpoints(DataFlow dataFlow, DeviceState stateMask, out IMMDeviceCollection devices); int GetDefaultAudioEndpoint(DataFlow dataFlow, Role role, out IMMDevice endpoint); int GetDevice(string id, out IMMDevice deviceName); int RegisterEndpointNotificationCallback(IMMNotificationClient client); int UnregisterEndpointNotificationCallback(IMMNotificationClient client); } </code></pre> I can post the other objects in there if necessary. What I'm missing is probably the core "why" something between Unity3D (also targeting .NET 2.0) and Visual Studio would change.
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<c#><unity3d><naudio>
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C#: Unity3D and NAudio EnumerateAudioEndPoints throws NullReferenceException
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