现在有越来越多的人在使用C#语言做编程，但我发现好像用C#做音视频流媒体开发的比较少。我们的libEasyScreenLive目前支持Windows、Android平台，通过EasyScreenLive我们就可以避免接触到稍显复杂的音视频源采集，编码和流媒体推送以及RTSP/RTP/RTCP/RTMP服务流程。
本文就给大家介绍一下c#封装libEasyScreenLive同屏功能组件流程。
新建一个类CapturePusherSDK，封装如下：
public class CapturePusherSDK
{
/// <summary>
/// 初始化推送接口，返回推送句柄
/// </summary>
/// <returns></returns>
public static IntPtr EasyScreenLive_CreateEx()
{
var ret = EasyScreenLive_Create();
return ret;
}
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_Create@@YAPAXPAD0000@Z")]
private static extern IntPtr EasyScreenLive_Create(
string EasyIPCamera_Key = "6D72754B7A4969576B5A7341574668656F61656E772B314659584E3555324E795A57567554476C325A53356C65475862567778576F502F443430566863336C4559584A33615735555A57467453584E55614756435A584E30514449774D54686C59584E35",
string EasyRTMP_Key = "79397037795969576B5A7341574668656F61656E772B314659584E3555324E795A57567554476C325A53356C65475751567778576F502F443430566863336C4559584A33615735555A57467453584E55614756435A584E30514449774D54686C59584E35",
string EasyRTSP_Key = "6A36334A743469576B5A7341574668656F61656E772B314659584E3555324E795A57567554476C325A53356C6547572B567778576F502F443430566863336C4559584A33615735555A57467453584E55614756435A584E30514449774D54686C59584E35",
string RTMPClient_KEY = null,
string RTSPClient_KEY = null
);
/// <summary>
/// 推送實例銷毀
/// </summary>
/// <param name="pusherHandle">EasyPusher_Create返回值</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_Release@@YAXPAX@Z")]
public static extern void EasyScreenLive_Release(IntPtr pusherHandle);
/// <summary>
/// 判断系统是否支持英伟达硬件编码
/// </summary>
/// <param name="pusherHandle">EasyScreenLive_IsSupportNvEncoder返回值</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_IsSupportNvEncoder@@YA_NPAX@Z")]
public static extern bool EasyScreenLive_IsSupportNvEncoder(IntPtr pusherHandle);
/// <summary>
/// 设置屏幕采集是否采集鼠标光标
/// </summary>
/// <param name="pusherHandle">EasyScreenLive_IsSupportNvEncoder返回值</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_SetCaptureCursor@@YAHPAX_N@Z")]
public static extern int EasyScreenLive_SetCaptureCursor(IntPtr pusherHandle, bool bShow);
/// <summary>
/// 開始音視頻數據捕捉
/// 返回1正常
/// </summary>
/// <param name="pusherHandle">EasyPusher_Create返回值</param>
/// <param name="eSourceType">推送數據源</param>
/// <param name="hCapWnd">預覽句柄</param>
/// <param name="encodeType">编码类型</param>
/// <param name="szDataType">推送數據類型</param>
/// <param name="nBitRate">比特率</param>
/// <returns></returns>
public static int EasyScreenLive_StartCapture(IntPtr pusherHandle, SOURCE_TYPE eSourceType, string szURL, IntPtr hCapWnd, EncoderType encodeType, string szDataType = "RGB24", int nWidth=1280, int nHeight=720, int nBitRate = 2048, bool bTranscode=false, ENCODE_MODE encMode=0)
{
var ret = EasyScreenLive_StartCapture(pusherHandle, eSourceType, szURL, 0, -1, hCapWnd, encodeType, nVideoWidth : nWidth, nVideoHeight: nHeight, nBitRate: nBitRate, szDataType: szDataType, bTransCode:bTranscode, encodeMode:encMode);
return ret;
}
/// <summary>
/// 開始音視頻數據捕捉
/// 返回1正常
/// </summary>
/// <param name="pusherHandle">EasyPusher_Create返回值</param>
/// <param name="eSourceType">推送數據源</param>
/// <param name="nCamId">視頻設備ID</param>
/// <param name="nAudioId">音頻設備ID</param>
/// <param name="hCapWnd">預覽句柄</param>
/// <param name="nVideoWidth"></param>
/// <param name="nVideoHeight"></param>
/// <param name="nFps"></param>
/// <param name="nBitRate">比特率</param>
/// <param name="szDataType">推送數據類型</param>
/// <param name="nSampleRate"></param>
/// <param name="nChannel">推送通道號</param>
/// <returns></returns>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StartCapture@@YAHPAXW4tagSOURCE_TYPE@@PADHH0HHHHH2HH_NW4tagENCODE_MODE@@@Z")]
private static extern int EasyScreenLive_StartCapture(IntPtr pusherHandle, SOURCE_TYPE eSourceType, string szURL, int nCamId, int nAudioId, IntPtr hCapWnd, EncoderType encodeType,
int nVideoWidth = 1280, int nVideoHeight = 720, int nFps = 30, int nBitRate = 1024, string szDataType = "RGB24", //VIDEO PARAM
int nSampleRate = 44100, int nChannel = 2, bool bTransCode = false, ENCODE_MODE encodeMode = 0);
/// <summary>
/// 停止數據采集
/// </summary>
/// <param name="pusherHandle"></param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StopCapture@@YAXPAX@Z")]
public static extern void EasyScreenLive_StopCapture(IntPtr pusherHandle);
/// <summary>
/// 開始數據推送
/// 返回0正常
/// </summary>
/// <param name="pusher">EasyPusher_Create返回值</param>
/// <param name="pushType">推送類型</param>
/// <param name="ServerIp">流媒體服務器地址</param>
/// <param name="nPushPort">流媒體服務器端口</param>
/// <param name="sPushName">流名稱</param>
/// <param name="nPushBufSize">默認緩衝</param>
/// <returns></returns>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StartPush@@YAHPAXW4tagPUSH_TYPE@@PADH2HH_N@Z")]
public static extern int EasyScreenLive_StartPush(IntPtr pusher, PUSH_TYPE pushType, string ServerIp, int nPushPort, string sPushName, int rtpOverTcp, int nPushBufSize = 1024, bool bServerRecord = false);
/// <summary>
/// 停止推送
/// </summary>
/// <param name="pusher">EasyPusher_Create返回值</param>
/// <param name="pushType">推送類型</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StopPush@@YAXPAXW4tagPUSH_TYPE@@@Z")]
public static extern void EasyScreenLive_StopPush(IntPtr pusher, PUSH_TYPE pushType);
/// <summary>
/// 开始RTSP服务,返回0正常
/// 注意:進程名稱需要為 EasyScreenLive.exe
/// </summary>
/// <param name="pusher">集采句柄</param>
/// <param name="listenport">服务端口</param>
/// <param name="username">用户名(可空)</param>
/// <param name="password">密码(可空)</param>
/// <param name="channelInfo">通道信息</param>
/// <param name="channelNum">服务支持通道数，默认为1</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StartServer@@YAHPAXHPAD1PAU__EASYLIVE_CHANNEL_INFO_T@@H@Z")]
public static extern int EasyScreenLive_StartServer(IntPtr pusher, int listenport, string username, string password, /*ref EASYLIVE_CHANNEL_INFO_T*/IntPtr infosIntptr, int channelNum = 1);
/// <summary>
/// 停止服务
/// </summary>
/// <param name="pusher">EasyPusher_Create返回值</param>
/// <param name="pushType">推送類型</param>
[DllImport(@"Lib\libEasyScreenLive.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?EasyScreenLive_StopServer@@YAHPAXH@Z")]
public static extern int EasyScreenLive_StopServer(IntPtr serverHandle, int serverId);
}
public enum SOURCE_TYPE
{
SOURCE_LOCAL_CAMERA = 0,//本地音视频
SOURCE_SCREEN_CAPTURE = 1,//屏幕捕获
SOURCE_RTSP_STREAM = 2,//RTSP流
SOURCE_RTMP_STREAM = 3,//RTMP流
SOURCE_FILE_STREAM = 4, //文件流推送(mp4,ts,flv???)
}
public enum PUSH_TYPE
{
PUSH_NONE = 0,
PUSH_RTSP,
PUSH_RTMP,
//ADD ANY OTHER PUSH TYPE
}
/// <summary>
/// 编码类型
/// </summary>
public enum EncoderType
{
默认编码器 = 0,//（效率最低，通用性强）
快速软编码 = 1,//（效率高，通用性不强）
快速硬编码 = 2//效率最高，通用性最低，需要英伟达独立显卡支持
}
public enum ENCODE_MODE
{
H264 = 0,
H265 = 1
}
[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public struct EASYLIVE_CHANNEL_INFO_T
{
public int id;
public int enable_multicast; //是否启用组播
public int videoRTPPortNum;
public int audioRTPPortNum;
public int ttl;
public int enableFec; // 是否使能fec
public int fecGroudSize;// fec组大小
public int fecParam; // fec 冗余包 fecParam/%
public int isEnableArq; // 使能 arq
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 36)]
public string multicast_addr;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
public string name;
}