C#封装libEasyRTMP过程介绍

在编程语言中真正的霸主多年来一直是C++，所有的操作系统和绝大多数的商品软件都是用C++作为主要开发语言的。但是C#几乎集中了所有关于软件开发和软件工程研究的最新成果：面向对象、类型安全、组件技术、自动内存管理、跨平台异常处理、版本控制、代码安全管理……。

本文我主要写一下C#封装libEasyRTMP的过程给大家参考一下，具体过程如下：

1、新建一个C#类库项目，如下图

2、查看接口函数

3、新建一个类EasyRTMPNetSDK，封装如下：

public class EasyRTMPNetSDK
    {
       
        [StructLayoutAttribute(LayoutKind.Sequential)]
        public struct EASY_AV_Frame
        {
            public uint u32AVFrameFlag;    /* 帧标志  视频 or 音频 */
            public uint u32AVFrameLen;     /* 帧的长度 */
            public uint u32VFrameType;     /* 视频的类型，I帧或P帧 */
            public IntPtr pBuffer;           /* 数据 */
            public uint u32TimestampSec;   /* 时间戳(秒)*/
            public uint u32TimestampUsec;    /* 时间戳(微秒) */
        }

        public enum EASY_RTMP_STATE_T
        {
            EASY_RTMP_STATE_CONNECTING = 1,     /* 连接中 */
            EASY_RTMP_STATE_CONNECTED,              /* 连接成功 */
            EASY_RTMP_STATE_CONNECT_FAILED,         /* 连接失败 */
            EASY_RTMP_STATE_CONNECT_ABORT,          /* 连接异常中断 */
            EASY_RTMP_STATE_PUSHING,                /* 推流中 */
            EASY_RTMP_STATE_DISCONNECTED,           /* 断开连接 */
            EASY_RTMP_STATE_ERROR
        }

        [StructLayoutAttribute(LayoutKind.Sequential)]
        public struct EASY_MEDIA_INFO_T
        {
            /// <summary>
            /// 视频编码类型
            /// </summary>
            public uint u32VideoCodec;

            /// <summary>
            /// 视频帧率
            /// </summary>
            public uint u32VideoFps;



            /// <summary>
            /// 音频编码类型
            /// </summary>
            public uint u32AudioCodec;

            /// <summary>
            /// 音频采样率
            /// </summary>
            public uint u32AudioSamplerate;

            /// <summary>
            /// 音频通道数
            /// </summary>
            public uint u32AudioChannel;

            /// <summary>
            /// 音频采样精度
            /// </summary>
            public uint u32AudioBitsPerSample;

            /// <summary>
            /// 视频sps帧长度
            /// </summary>
            public uint u32VpsLength;

            /// <summary>
            /// 视频sps帧长度
            /// </summary>
            public uint u32SpsLength;

            /// <summary>
            /// 视频pps帧长度
            /// </summary>
            public uint u32PpsLength;


            /// <summary>
            /// 视频pps帧长度
            /// </summary>
            public uint u32SeiLength;

            /// <summary>
            /// 视频u8Vps帧内容
            /// </summary>
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 256)]
            public byte[] u8Vps;

            /// <summary>
            /// 视频sps帧内容
            /// </summary>
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 256)]
            public byte[] u8Sps;

            /// <summary>
            /// 视频sps帧内容
            /// </summary>
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 128)]
            public byte[] u8Pps;

            /// <summary>
            /// 视频u8Sei帧内容
            /// </summary>
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 128)]
            public byte[] u8Sei;
        }

        public delegate int EasyRTMPCallBack(int _id, EASY_RTMP_STATE_T _state, ref EASY_AV_Frame _frame, IntPtr _userptr);


        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_Activate@4")]
        public static extern int EasyRTMP_Activate(string license = "79736C36655969576B5A7541767A52656F6374414A65394659584E35556C524E55463949535573755A58686C4B56634D5671442F706634675A57467A65513D3D");

        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_Create@0")]
        /* 创建推送句柄  返回为句柄值 */
        public static extern IntPtr EasyRTMP_Create();


        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_SetCallback@12")]
        /* 设置流传输事件回调 userptr传输自定义对象指针*/
        public static extern uint EasyRTMP_SetCallback(IntPtr handle, EasyRTMPCallBack callback, IntPtr userptr);

        /* 开始流传输 serverAddr:流媒体服务器地址、port:流媒体端口、streamName:流名称<xxx.sdp>、username/password:推送携带的用户名密码、pstruStreamInfo:推送的媒体定义、bufferKSize:以k为单位的缓冲区大小<512~2048之间,默认512> bool createlogfile:创建日志文件*/
        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_Connect@8")]
        public static extern uint EasyRTMP_Connect(IntPtr handle, string url);

        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_InitMetadata@12")]
        /* 停止流传输 */
        public static extern uint EasyRTMP_InitMetadata(IntPtr handle, ref EASY_MEDIA_INFO_T pstruStreamInfo, uint bufferKSize);

        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_SendPacket@8")]
        /* 推流 frame:具体推送的流媒体帧 */
        public static extern uint EasyRTMP_SendPacket(IntPtr pushPtr, ref EASY_AV_Frame frame);

        [DllImport(@"Lib\libeasyrtmp.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "_EasyRTMP_Release@4")]
        /* 释放推送句柄 */
        public static extern uint EasyRTMP_Release(IntPtr pushPtr);

    }