SIPSorcery.Net.RTPVP8Header.GetVP8Header C# (CSharp) Méthode

        public static RTPVP8Header GetVP8Header(byte[] rtpPayload)
        {
            RTPVP8Header vp8Header = new RTPVP8Header();
            int payloadHeaderStartIndex = 1;

            // First byte of payload descriptor.
            vp8Header.ExtendedControlBitsPresent = ((rtpPayload[0] >> 7) & 0x01) == 1;
            vp8Header.StartOfVP8Partition = ((rtpPayload[0] >> 4) & 0x01) == 1;
            vp8Header._length = 1;

            // Is second byte being used.
            if(vp8Header.ExtendedControlBitsPresent)
            {
                vp8Header.IsPictureIDPresent = ((rtpPayload[1] >> 7) & 0x01) == 1;
                vp8Header._length = 2;
                payloadHeaderStartIndex = 2;
            }

            // Is the picture ID being used.
            if(vp8Header.IsPictureIDPresent)
            {
                if (((rtpPayload[2] >> 7) & 0x01) == 1)
                {
                    // The Picure ID is using two bytes.
                    vp8Header._length = 4;
                    payloadHeaderStartIndex = 4;
                    vp8Header.PictureID = BitConverter.ToUInt16(rtpPayload, 2);
                }
                else
                {
                    // The picture ID is using one byte.
                    vp8Header.PictureID = rtpPayload[2];
                    vp8Header._length = 3;
                    payloadHeaderStartIndex = 3;
                }
            }

            vp8Header._payloadDescriptorLength = payloadHeaderStartIndex;

            // Payload header only on first packet in frame.
            if (vp8Header.StartOfVP8Partition)
            {
                byte s0 = (byte)((rtpPayload[payloadHeaderStartIndex] >> 5) & 0x07);
                vp8Header.ShowFrame = (byte)((rtpPayload[payloadHeaderStartIndex] >> 4) & 0x01) == 1;
                vp8Header.IsKeyFrame = (rtpPayload[payloadHeaderStartIndex] & 0x01) == 0;
                byte s1 = rtpPayload[payloadHeaderStartIndex + 1];
                byte s2 = rtpPayload[payloadHeaderStartIndex + 2];
                vp8Header.FirstPartitionSize = s0 + (8 * s1) + (2048 * s2);

                vp8Header._length += 3;
            }

            return vp8Header;
        }

        public byte[] GetFramePayload()
        {
            List <byte> payload = new List <byte>();

            foreach (var rtpPacket in _packets.OrderBy(x => x.Header.SequenceNumber))
            {
                if (FrameType == FrameTypesEnum.VP8)
                {
                    var vp8Header = RTPVP8Header.GetVP8Header(rtpPacket.Payload);
                    payload.AddRange(rtpPacket.Payload.Skip(vp8Header.PayloadDescriptorLength));
                }
                else
                {
                    payload.AddRange(rtpPacket.Payload);
                }
            }

            return(payload.ToArray());
        }