CSharpRTMP.Core.Streaming.MP3Document.FindFrameData C# (CSharp) Метод

        private bool FindFrameData()
        {
            if (!MediaFile.SeekBegin())
            {
                Logger.FATAL("Unable to seek to the beginning of the file");
                return false;
            }

            var firstBytes = new byte[4];
            while (true)
            {
                //1. Read the first 4 bytes
                if (!MediaFile.PeekBuffer(firstBytes, 4))
                {
                    Logger.FATAL("Unable to read 4 bytes");
                    return false;
                }
                if ((firstBytes[0] != 0xff) || ((firstBytes[1] >> 5) != 7))
                {
                    MediaFile.SeekAhead(1);
                    continue;
                }

                //2. Split the flags
                byte version = (byte)((firstBytes[1] >> 3) & 0x03);
                byte layer = (byte)((firstBytes[1] >> 1) & 0x03);
                byte bitRateIndex = (byte)(firstBytes[2] >> 4);
                byte sampleRateIndex = (byte)((firstBytes[2] >> 2) & 0x03);
                byte paddingBit = (byte)((firstBytes[2] >> 1) & 0x01);

                //3. Compute the frame length from the flags
                var length = _frameSizes[version, layer, bitRateIndex, sampleRateIndex, paddingBit];
                if (length == 0)
                {
                    MediaFile.SeekAhead(1);
                    continue;
                }

                //4. Save the cursor value and seek ahead to the next frame
                long cursor = MediaFile.Position;
                MediaFile.SeekTo(cursor + (long) length);

                //5. Try to read 4 bytes again
                if (!MediaFile.PeekBuffer(firstBytes, 4))
                {
                    Logger.FATAL("Unable to read 4 bytes");
                    return false;
                }

                //6. Is this a frame start?
                if ((firstBytes[0] == 0xff) && ((firstBytes[1] >> 5) == 7)) return true;
                MediaFile.SeekTo(cursor + 1);

                //7. Jack pot!
            }
        }