ADBaseLibrary.AdobeHDS.FragmentProcessor.InitFile C# (CSharp) Method

        public async Task InitFile()
        {
            writeStream = Stream.Synchronized(File.Open(outputfile, FileMode.Create, FileAccess.Write));
            await writeStream.WriteAsync(FlvHeader, 0, FlvHeader.Length);
            if (media.Metadata != null)
            {
                byte[] metadata = Convert.FromBase64String(media.Metadata);
                byte[] header = new byte[11];
                header[0] = SCRIPT_DATA_PACKET;
                header[1] = (byte)(metadata.Length >> 16);
                header[2] = (byte) ((metadata.Length >> 8) & 0xFF);
                header[3] = (byte) (metadata.Length & 0xff);
                metadata[metadata.Length - 1] = 0x9;
                await writeStream.WriteAsync(header, 0, 11);
                await writeStream.WriteAsync(metadata, 0, metadata.Length);
                byte[] finalsize=BitConverter.GetBytes((int) (metadata.Length + 11));
                Array.Reverse(finalsize);
                await writeStream.WriteAsync(finalsize, 0, 4);
            }
        }