private void OnMessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
{
    var reader = args.GetDataReader();
    reader.ByteOrder = ByteOrder.LittleEndian;

    if (reader.UnconsumedBufferLength < 12) return;
    int seq = reader.ReadInt32();
    long pts = reader.ReadInt64();

    uint payloadLen = reader.UnconsumedBufferLength;
    byte[] buf = new byte[payloadLen];
    reader.ReadBytes(buf);

    var msIn = new MemoryStream(buf);
    var gzip = new GZipStream(msIn, CompressionMode.Decompress);
    var msOut = new MemoryStream();
    
    gzip.CopyTo(msOut);
    var pcm = msOut.ToArray();
}