MissionPlanner.OSDVideo.GetAudioStreams C# (CSharp) Method

        private List<int> GetAudioStreams(string filename)
        {
            IMediaDet md = new MediaDet() as IMediaDet;
            Guid streamType;
            AMMediaType mt = new AMMediaType();
            int hr, nStreams;
            List<int> streamList = new List<int>();

            md.put_Filename(filename);
            md.get_OutputStreams(out nStreams);

            for (int i = 0; i < nStreams; i++)
            {
                hr = md.put_CurrentStream(i);
                DsError.ThrowExceptionForHR(hr);

                hr = md.get_StreamType(out streamType);
                DsError.ThrowExceptionForHR(hr);
                if (streamType == MediaType.Audio)
                    streamList.Add(i);
            }

            return streamList;
        }