C#调用C回调函数后，程序奔溃问题

delegate void DlgVideoStreamCallBack(IntPtr pData, int size, int height, int width, IntPtr pUserData);

[DllImport("peerclient.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "Webrtc_ResigsterLocalVideoCallBack")]
public static extern void Webrtc_ResigsterLocalVideoCallBack(DlgVideoStreamCallBack callback, int thread_id);

static void LocalVideoStreamCallBack(IntPtr pData, int size, int height, int width, IntPtr pUserData)
{

}

[System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute(System.Runtime.InteropServices.CallingConvention.Cdecl)]
delegate void DlgVideoStreamCallBack(IntPtr pData, int size, int height, int width, IntPtr pUserData);