使用使用C#实现实现RTP数据包传输数据包传输 参照参照RFC3550
本篇文章小编为大家介绍，使用C#实现RTP数据包传输 参照RFC3550，需要的朋友参考下
闲暇时折腾IP网络视频监控系统，需要支持视频帧数据包在网络内的传输。
未采用H.264或MPEG4等编码压缩方式，直接使用Bitmap图片。
由于对帧的准确到达要求不好，所以采用UDP传输。如果发生网络丢包现象则直接将帧丢弃。
为了记录数据包的传输顺序和帧的时间戳，所以研究了下RFC3550协议，采用RTP包封装视频帧。
并未全面深究，所以未使用SSRC和CSRC，因为不确切了解其用意。不过目前的实现情况已经足够了。
复制代码 代码如下:
/// <summary>
/// RTP(RFC3550)协议数据包
/// </summary>
/// <remarks>
/// The RTP header has the following format:
/// 0 1 2 3
/// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// |V=2|P|X| CC |M| PT | sequence number |
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// | timestamp |
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// | synchronization source (SSRC) identifier |
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
/// | contributing source (CSRC) identifiers |
/// | .... |
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// </remarks>
public class RtpPacket
{
/// <summary>
/// version (V): 2 bits
/// RTP版本标识，当前规范定义值为2.
/// This field identifies the version of RTP. The version defined by this specification is two (2).
/// (The value 1 is used by the first draft version of RTP and the value 0 is used by the protocol
/// initially implemented in the at" audio tool.)
/// </summary>
public int Version { get { return 2; } }
/// <summary>
/// padding (P)：1 bit
/// 如果设定padding，在报文的末端就会包含一个或者多个padding 字节，这不属于payload。
/// 最后一个字节的padding 有一个计数器，标识需要忽略多少个padding 字节(包括自己)。
/// 一些加密算法可能需要固定块长度的padding，或者是为了在更低层数据单元中携带一些RTP 报文。
/// If the padding bit is set, the packet contains one or more additional padding octets at the
/// end which are not part of the payload. The last octet of the padding contains a count of
/// how many padding octets should be ignored, including itself. Padding may be needed by
/// some encryption algorithms with fixed block sizes or for carrying several RTP packets in a
/// lower-layer protocol data unit.
/// </summary>
public int Padding { get { return 0; } }
/// <summary>
/// extension (X)：1 bit
/// 如果设定了extension 位，定长头字段后面会有一个头扩展。
/// If the extension bit is set, the fixed header must be followed by exactly one header extensio.
/// </summary>
public int Extension { get { return 0; } }
/// <summary>
/// CSRC count (CC)：4 bits
/// CSRC count 标识了定长头字段中包含的CSRC identifier 的数量。
/// The CSRC count contains the number of CSRC identifiers that follow the fixed header.
/// </summary>
public int CC { get { return 0; } }
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