private void SetComment(StreamState os, Stream stream)
        {
            var opusTags = new OpusTags();
            opusTags.Add("ENCODER", "opusenc from libopus 1.0.1-21-gff16ab0");
            opusTags.AddOption(_options.BitRate);
            opusTags.AddOption(_options.BitRateEncoding);
            opusTags.AddOption("ignorelength", string.Empty);

            opusTags.Pad();

            var opComment = new Packet
            {
                PacketData = opusTags.GetPacked(),
                PacketDataLength = opusTags.GetPackedLength(),
                Bos = 0,
                Eos = 0,
                GranulePos = 0
            };
            os.AddWaveData(opComment);
            os.Flush(stream);
        }
        private void SetHeader(StreamState os, Stream stream)
        {
            UInt16 preskip = 0;

            var header = new OpusHeader(_options.OutChannels.Value, _options.OutSamplingRate, preskip);
            var op = new Packet
            {
                PacketData = header.Packet,
                PacketDataLength = header.Packet.Length,
                Bos = 1,
                Eos = 0,
                GranulePos = 0
            };
            os.AddWaveData(op);
            os.Flush(stream);
        }