Windows平台基于RTMP实现一对一互动直播

目前市面上大多一对一互动都是基于WebRTC，缺点如下：

  1. 服务器部署非常复杂，不利于私有部署，在一些私密性高的场景下，无法使用，如公安、市政等体系；
  2. 传输基于UDP，很难保证传输质量，由于UDP是不可靠的传输协议，在复杂的公网网络环境下，各种突发流量、偶尔的传输错误、网络抖动、超时等等都会引起丢包异常，都会在一定程度上影响音视频通信的质量；
  3. 难以应对复杂的互联网环境，如跨区跨运营商、低带宽、高丢包等场景；
  4. 整个框架体系不够灵活，代码复杂度高，行话说的好：从demo到实用,中间还差1万个WebRTC。

RTMP一对一互动技术特点：

  •  基于现有RTMP推拉流体系，产品稳定度高，整体延迟低；
  •  加入噪音抑制、回音消除、自动增益控制等特性，确保通话效果；
  •  采用通用的RTMP和RTSP服务器，如nginx、SRS，更有利于私有部署；
  •  支持H.264的扩展SEI消息发送机制；
  •  支持H.265编码和H.264可变码率设定；
  •  支持H.265解码，直播播放器支持的功能，一对一互动模块都可以有选择的支持；
  •  适用于应急指挥、教育培训等领域。

废话不多说，上封装代码：

基于 https://github.com/daniulive/SmarterStreaming/ 拉流端封装的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using NT;namespace SmartEchoCancellationDemo
{public delegate void DelGetPlayerEventMsg(String msg);public delegate void DelGetVideoSize(String size);class nt_player_wrapper : IDisposable{[DllImport("kernel32", EntryPoint = "CopyMemory")]static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);private bool disposed_ = false;private IntPtr player_handle_ = IntPtr.Zero;private System.Windows.Forms.Control render_wnd_ = null;private System.Windows.Forms.PaintEventHandler render_wnd_paint_event_ = null;private bool is_playing_ = false;private bool is_mute_ = false;private int  play_buffer_ = 100;private NT_SP_VideoFrame cur_video_frame_ = new NT_SP_VideoFrame();private WeakReference sync_invoke_ = null;//分辨率信息回调delegate void ResolutionNotifyCallback(Int32 width, Int32 height);ResolutionNotifyCallback resolution_notify_callback_;SP_SDKVideoSizeCallBack video_size_call_back_;//视频数据回调SP_SDKVideoFrameCallBack video_frame_call_back_;delegate void VideoFrameCallBack(UInt32 status, NT_SP_VideoFrame frame);VideoFrameCallBack set_video_frame_call_back_;//event事件回调//拉流端事件SP_SDKEventCallBack pull_event_call_back_;delegate void SetPullEventCallBack(UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,[MarshalAs(UnmanagedType.LPStr)] String param4,[MarshalAs(UnmanagedType.LPStr)] String param5,IntPtr param6);SetPullEventCallBack set_pull_event_call_back_;private UInt32 connection_status_ = 0;private UInt32 buffer_status_ = 0;private Int32 buffer_percent_ = 0;private Int32 download_speed_ = -1;public event DelGetPlayerEventMsg EventGetPlayerEventMsg;public event DelGetVideoSize EventGetVideoSize;public nt_player_wrapper(System.Windows.Forms.Control render_wnd, System.ComponentModel.ISynchronizeInvoke sync_invoke){render_wnd_ = render_wnd;sync_invoke_ =  new WeakReference(sync_invoke);set_pull_event_call_back_ = new SetPullEventCallBack(PullEventCallBack);if (render_wnd_ != null){render_wnd_paint_event_ = new System.Windows.Forms.PaintEventHandler(this.OnRenderWindowPaint);render_wnd_.Paint += render_wnd_paint_event_;}}public void Dispose(){Dispose(true);// This object will be cleaned up by the Dispose method.// Therefore, you should call GC.SupressFinalize to// take this object off the finalization queue// and prevent finalization code for this object// from executing a second time.// GC.SuppressFinalize(this);}protected virtual void Dispose(bool disposing){// Check to see if Dispose has already been called.if (!this.disposed_){if (disposing){}if (IsPlaying()){StopPlay(false);}if (render_wnd_ != null && render_wnd_paint_event_ != null){render_wnd_.Paint -= render_wnd_paint_event_;}render_wnd_paint_event_ = null;if (cur_video_frame_.plane0_ != IntPtr.Zero){Marshal.FreeHGlobal(cur_video_frame_.plane0_);cur_video_frame_.plane0_ = IntPtr.Zero;}// Note disposing has been done.disposed_ = true;}}~nt_player_wrapper(){Dispose(false);}public void SetVideoFrameCallBack(IntPtr handle, IntPtr userData, UInt32 status, IntPtr frame){if (frame == IntPtr.Zero){return;}//如需直接处理RGB数据，请参考以下流程NT_SP_VideoFrame video_frame = (NT_SP_VideoFrame)Marshal.PtrToStructure(frame, typeof(NT_SP_VideoFrame));if (video_frame.format_ != (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FORMAT_RGB32)return;NT_SP_VideoFrame pVideoFrame = new NT_SP_VideoFrame();pVideoFrame.format_ = video_frame.format_;pVideoFrame.width_ = video_frame.width_;pVideoFrame.height_ = video_frame.height_;pVideoFrame.timestamp_ = video_frame.timestamp_;pVideoFrame.stride0_ = video_frame.stride0_;pVideoFrame.stride1_ = video_frame.stride1_;pVideoFrame.stride2_ = video_frame.stride2_;pVideoFrame.stride3_ = video_frame.stride3_;if (sync_invoke_ != null){System.ComponentModel.ISynchronizeInvoke sync_invoke_target = sync_invoke_.Target as System.ComponentModel.ISynchronizeInvoke;if (sync_invoke_target != null){Int32 argb_size = video_frame.stride0_ * video_frame.height_;pVideoFrame.plane0_ = Marshal.AllocHGlobal(argb_size);CopyMemory(pVideoFrame.plane0_, video_frame.plane0_, (UInt32)argb_size);if (sync_invoke_target.InvokeRequired){sync_invoke_target.BeginInvoke(set_video_frame_call_back_, new object[] { status, pVideoFrame });}else{set_video_frame_call_back_(status, pVideoFrame);}}}}public void SDKVideoFrameCallBack(UInt32 status, NT_SP_VideoFrame frame){if (cur_video_frame_.plane0_ != IntPtr.Zero){Marshal.FreeHGlobal(cur_video_frame_.plane0_);cur_video_frame_.plane0_ = IntPtr.Zero;}cur_video_frame_ = frame;if (render_wnd_ != null){render_wnd_.Invalidate();}}public void SDKPullEventCallBack(IntPtr handle, IntPtr user_data,UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,[MarshalAs(UnmanagedType.LPStr)] String param4,[MarshalAs(UnmanagedType.LPStr)] String param5,IntPtr param6){if (sync_invoke_ != null){System.ComponentModel.ISynchronizeInvoke sync_invoke_target = sync_invoke_.Target as System.ComponentModel.ISynchronizeInvoke;if (sync_invoke_target  != null ){if (sync_invoke_target.InvokeRequired){sync_invoke_target.BeginInvoke(set_pull_event_call_back_, new object[] { event_id, param1, param2, param3, param4, param5, param6 });}else{set_pull_event_call_back_(event_id, param1, param2, param3, param4, param5, param6);}}}}private void PullEventCallBack(UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,[MarshalAs(UnmanagedType.LPStr)] String param4,[MarshalAs(UnmanagedType.LPStr)] String param5,IntPtr param6){if (!is_playing_){return;}String show_str = "";if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_PLAYBACK_REACH_EOS == event_id){StopPlay();return;}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_RTSP_STATUS_CODE == event_id){int status_code = (int)param1;show_str = "RTSP incorrect status code received: " + status_code.ToString() + ", 请确保用户名/密码正确";}if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTING == event_id|| (UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTION_FAILED == event_id|| (UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTED == event_id|| (UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_DISCONNECTED == event_id){connection_status_ = event_id;}if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_START_BUFFERING == event_id|| (UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_BUFFERING == event_id|| (UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_STOP_BUFFERING == event_id){buffer_status_ = event_id;if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_BUFFERING == event_id){buffer_percent_ = (Int32)param1;}}if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_DOWNLOAD_SPEED == event_id){download_speed_ = (Int32)param1;}if (connection_status_ != 0){show_str += "连接状态: ";if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTING == connection_status_){show_str += "连接中";}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTION_FAILED == connection_status_){show_str += "连接失败";}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_CONNECTED == connection_status_){show_str += "连接成功";}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_DISCONNECTED == connection_status_){show_str += "断开连接";}}if (download_speed_ != -1){String ss = "  下载速度: " + (download_speed_ * 8 / 1000).ToString() + "kbps " + (download_speed_ / 1024).ToString() + "KB/s";show_str += ss;}if (buffer_status_ != 0){show_str += "  缓冲状态: ";if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_START_BUFFERING == buffer_status_){show_str += "开始缓冲";}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_BUFFERING == buffer_status_){String ss = "缓冲中 " + buffer_percent_.ToString() + "%";show_str += ss;}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_STOP_BUFFERING == buffer_status_){show_str += "结束缓冲";}}if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_NEED_KEY == event_id){show_str = "RTMP加密流，请设置播放需要的Key..";}else if ((UInt32)NTSmartPlayerDefine.NT_SP_E_EVENT_ID.NT_SP_E_EVENT_ID_KEY_ERROR == event_id){show_str = "RTMP加密流，Key错误，请重新设置..";}EventGetPlayerEventMsg(show_str);}public void SetMute(bool is_mute){is_mute_ = is_mute;if ( !is_playing_ )return;NTSmartPlayerSDK.NT_SP_SetMute(player_handle_, is_mute ? 1 : 0); }public void SetBuffer(int buffer_time){if (buffer_time >= 0){play_buffer_ = buffer_time;}}public bool IsPlaying(){ return is_playing_; }public bool OpenPullHandle(String url, bool is_rtsp_tcp_mode, bool is_mute){if ( player_handle_ != IntPtr.Zero )return true;if ( String.IsNullOrEmpty(url) )return false;IntPtr pull_handle = IntPtr.Zero;if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPlayerSDK.NT_SP_Open(out pull_handle, IntPtr.Zero, 0, IntPtr.Zero)){return false;}if (pull_handle == IntPtr.Zero){return false;}pull_event_call_back_ = new SP_SDKEventCallBack(SDKPullEventCallBack);NTSmartPlayerSDK.NT_SP_SetEventCallBack(pull_handle, IntPtr.Zero, pull_event_call_back_);resolution_notify_callback_ = new ResolutionNotifyCallback(PlaybackWindowResized);set_video_frame_call_back_ = new VideoFrameCallBack(SDKVideoFrameCallBack);NTSmartPlayerSDK.NT_SP_SetBuffer(pull_handle, play_buffer_);NTSmartPlayerSDK.NT_SP_SetFastStartup(pull_handle, 1);NTSmartPlayerSDK.NT_SP_SetRtspAutoSwitchTcpUdp(pull_handle, 1);NTSmartPlayerSDK.NT_SP_SetRTSPTcpMode(pull_handle, is_rtsp_tcp_mode ? 1 : 0);NTSmartPlayerSDK.NT_SP_SetMute(pull_handle, is_mute_ ? 1 : 0);//RTSP timeout设置Int32 rtsp_timeout = 10;NTSmartPlayerSDK.NT_SP_SetRtspTimeout(pull_handle, rtsp_timeout);//RTSP TCP/UDP自动切换设置Int32 is_auto_switch_tcp_udp = 1;NTSmartPlayerSDK.NT_SP_SetRtspAutoSwitchTcpUdp(pull_handle, is_auto_switch_tcp_udp);NTSmartPlayerSDK.NT_SP_SetMute(pull_handle, is_mute ? 1 : 0);if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPlayerSDK.NT_SP_SetURL(pull_handle, url)){NTSmartPlayerSDK.NT_SP_Close(pull_handle);pull_handle = IntPtr.Zero;return false;}player_handle_ = pull_handle;return true;}private void PlaybackWindowResized(Int32 width, Int32 height){String resolution = width + "*" + height;EventGetVideoSize(resolution);}public void SP_SDKVideoSizeHandle(IntPtr handle, IntPtr userData, Int32 width, Int32 height){if (null == sync_invoke_)return;System.ComponentModel.ISynchronizeInvoke sync_invoke_target = sync_invoke_.Target as System.ComponentModel.ISynchronizeInvoke;if (sync_invoke_target != null){if (sync_invoke_target.InvokeRequired){sync_invoke_target.BeginInvoke(resolution_notify_callback_, new object[] { width, height });}else{resolution_notify_callback_(width, height);}}}public bool StartPlay(String url, bool is_rtsp_tcp_mode, bool is_mute){if ( is_playing_ )return false;if ( !OpenPullHandle(url, is_rtsp_tcp_mode, is_mute) )return false;NTSmartPlayerSDK.NT_SP_SetMute(player_handle_, is_mute ? 1 : 0);//video resolution callbackvideo_size_call_back_ = new SP_SDKVideoSizeCallBack(SP_SDKVideoSizeHandle);NTSmartPlayerSDK.NT_SP_SetVideoSizeCallBack(player_handle_, IntPtr.Zero, video_size_call_back_);bool is_support_d3d_render = false;Int32 in_support_d3d_render = 0;if (NT.NTBaseCodeDefine.NT_ERC_OK == NTSmartPlayerSDK.NT_SP_IsSupportD3DRender(player_handle_, render_wnd_.Handle, ref in_support_d3d_render)){if (1 == in_support_d3d_render){is_support_d3d_render = true;}}// is_support_d3d_render = false;if (is_support_d3d_render){// 支持d3d绘制的话，就用D3D绘制NTSmartPlayerSDK.NT_SP_SetRenderWindow(player_handle_, render_wnd_.Handle);NTSmartPlayerSDK.NT_SP_SetRenderScaleMode(player_handle_, 1);}else{// 不支持D3D就让播放器吐出数据来，用GDI绘制，本demo仅用来展示一对一互动使用，具体可参考播放端的demo//video frame callback (YUV/RGB)//format请参见 NT_SP_E_VIDEO_FRAME_FORMAT，如需回调YUV，请设置为 NT_SP_E_VIDEO_FRAME_FROMAT_I420video_frame_call_back_ = new SP_SDKVideoFrameCallBack(SetVideoFrameCallBack);NTSmartPlayerSDK.NT_SP_SetVideoFrameCallBack(player_handle_, (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FORMAT_RGB32, IntPtr.Zero, video_frame_call_back_);}uint ret = NTSmartPlayerSDK.NT_SP_StartPlay(player_handle_);if ( NTBaseCodeDefine.NT_ERC_OK != ret ){NTSmartPlayerSDK.NT_SP_Close(player_handle_);player_handle_ = IntPtr.Zero;return false;}is_playing_ = true;return true;}public void StopPlay(bool is_update_ui =true){if ( !is_playing_ )return;NTSmartPlayerSDK.NT_SP_StopPlay(player_handle_);NTSmartPlayerSDK.NT_SP_Close(player_handle_);player_handle_ = IntPtr.Zero;is_playing_ = false;if (is_update_ui && render_wnd_ != null){render_wnd_.Invalidate();}}private void GetRenderRect(int limtWidth, int limtHeight, int image_w, int image_h, ref int left_offset, ref int top_offset, ref int dw, ref int dh){if (limtWidth < 1 || limtHeight < 1){left_offset = 0;top_offset = 0;dw = limtWidth;dh = limtHeight;return;}if (image_w < 1 || image_h < 1){left_offset = 0;top_offset = 0;dw = limtWidth;dh = limtHeight;return;}// 按比例double limit_ratio = limtWidth * 1.0 / limtHeight;double video_ratio = image_w * 1.0 / image_h;if (video_ratio > limit_ratio){dw = limtWidth;dh = (int)(dw * image_h * 1.0 / image_w);if (dh > limtHeight)dh = limtHeight;}else{dh = limtHeight;dw = (int)(dh * image_w * 1.0 / image_h);if (dw > limtWidth)dw = limtWidth;}left_offset = limtWidth / 2 - dw / 2;if (left_offset < 0)left_offset = 0;top_offset = limtHeight / 2 - dh / 2;if (top_offset < 0)top_offset = 0;}private void OnRenderWindowPaint(object sender, PaintEventArgs e){if (render_wnd_.Width < 1 || render_wnd_.Height < 1)return;Graphics g = e.Graphics;Brush brush = new SolidBrush(Color.Black);g.FillRectangle(brush, 0, 0, render_wnd_.Width, render_wnd_.Height);if ( IsPlaying() && cur_video_frame_.plane0_ != IntPtr.Zero){g.SmoothingMode = SmoothingMode.HighSpeed;int image_width = cur_video_frame_.width_;int image_height = cur_video_frame_.height_;Bitmap bitmap = new Bitmap(image_width, image_height, cur_video_frame_.stride0_,System.Drawing.Imaging.PixelFormat.Format32bppRgb, cur_video_frame_.plane0_);int d_w = 0, d_h = 0;int left_offset = 0;int top_offset = 0;GetRenderRect(render_wnd_.Width, render_wnd_.Height, image_width, image_height, ref left_offset, ref top_offset, ref d_w, ref d_h);g.DrawImage(bitmap,  left_offset, top_offset, d_w, d_h);   //在窗体的画布中绘画出内存中的图像}         }}
}

基于 https://github.com/daniulive/SmarterStreaming/ 推流端封装的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using NT;namespace SmartEchoCancellationDemo
{public delegate void DelGetPublisherEventMsg(String msg);   //推送端Event消息public struct NT_VideoFrame{public Int32 width_;   // 图像宽public Int32 height_;  // 图像高public IntPtr plane_;public Int32 stride_;}public struct CameraInfo{public String name_;public String id_;public List<NT_PB_VideoCaptureCapability> capabilities_;};class nt_publisher_wrapper : IDisposable{[DllImport("kernel32", EntryPoint = "CopyMemory")]static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);private bool disposed_ = false;private IntPtr publisher_handle_ = IntPtr.Zero;private System.Windows.Forms.Control render_wnd_ = null;private System.Windows.Forms.PaintEventHandler render_wnd_paint_event_ = null;private int publisher_handle_count_;private bool is_publishing_ = false;private bool is_previewing_ = false;private WeakReference sync_invoke_ = null;//event事件回调NT_PB_SDKEventCallBack pb_event_call_back_;delegate void PbSetEventCallBack(UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,UInt64 param4,[MarshalAs(UnmanagedType.LPStr)] String param5,[MarshalAs(UnmanagedType.LPStr)] String param6,IntPtr param7);PbSetEventCallBack pb_set_event_call_back_;//预览数据回调NT_PB_SDKVideoPreviewImageCallBack video_preview_image_callback_;delegate void SetVideoPreviewImageCallBack(NT_VideoFrame frame);SetVideoPreviewImageCallBack set_video_preview_image_callback_;private NT_VideoFrame cur_image_ = new NT_VideoFrame();public event DelGetPublisherEventMsg EventGetPublisherEventMsg;public nt_publisher_wrapper(System.Windows.Forms.Control render_wnd, System.ComponentModel.ISynchronizeInvoke sync_invoke){render_wnd_ = render_wnd;sync_invoke_ = new WeakReference(sync_invoke); ;pb_set_event_call_back_ = new PbSetEventCallBack(PbEventCallBack);if (render_wnd_ != null){render_wnd_paint_event_ = new System.Windows.Forms.PaintEventHandler(this.OnRenderWindowPaint);render_wnd_.Paint += render_wnd_paint_event_;}}public void Dispose(){Dispose(true);// This object will be cleaned up by the Dispose method.// Therefore, you should call GC.SupressFinalize to// take this object off the finalization queue// and prevent finalization code for this object// from executing a second time.// GC.SuppressFinalize(this);}protected virtual void Dispose(bool disposing){// Check to see if Dispose has already been called.if (!this.disposed_){if (disposing){}if (render_wnd_ != null && render_wnd_paint_event_ != null){render_wnd_.Paint -= render_wnd_paint_event_;}render_wnd_paint_event_ = null;if (cur_image_.plane_ != IntPtr.Zero){Marshal.FreeHGlobal(cur_image_.plane_);cur_image_.plane_ = IntPtr.Zero;}// Note disposing has been done.disposed_ = true;}}~nt_publisher_wrapper(){Dispose(false);}private void PbEventCallBack(UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,UInt64 param4,[MarshalAs(UnmanagedType.LPStr)] String param5,[MarshalAs(UnmanagedType.LPStr)] String param6,IntPtr param7){String event_log = "";switch (event_id){case (uint)NTSmartPublisherDefine.NT_PB_E_EVENT_ID.NT_PB_E_EVENT_ID_CONNECTING:event_log = "连接中";if (!String.IsNullOrEmpty(param5)){event_log = event_log + " url:" + param5;}break;case (uint)NTSmartPublisherDefine.NT_PB_E_EVENT_ID.NT_PB_E_EVENT_ID_CONNECTION_FAILED:event_log = "连接失败";if (!String.IsNullOrEmpty(param5)){event_log = event_log + " url:" + param5;}break;case (uint)NTSmartPublisherDefine.NT_PB_E_EVENT_ID.NT_PB_E_EVENT_ID_CONNECTED:event_log = "已连接";if (!String.IsNullOrEmpty(param5)){event_log = event_log + " url:" + param5;}break;case (uint)NTSmartPublisherDefine.NT_PB_E_EVENT_ID.NT_PB_E_EVENT_ID_DISCONNECTED:event_log = "断开连接";if (!String.IsNullOrEmpty(param5)){event_log = event_log + " url:" + param5;}break;default:break;}EventGetPublisherEventMsg(event_log);}public int CalBitRate(int frame_rate, int w, int h){int kbit_rate = 2000;int area = w * h;if (area <= (320 * 300)){kbit_rate = 280;}else if (area <= (360 * 320)){kbit_rate = 360;}else if (area <= (640 * 480)){kbit_rate = 580;}else if (area <= (800 * 600)){kbit_rate = 620;}else if (area <= (900 * 700)){kbit_rate = 820;}else if (area <= (1280 * 720)){kbit_rate = 1600;}else if (area <= (1366 * 768)){kbit_rate = 2000;}else if (area <= (1600 * 900)){kbit_rate = 2300;}else if (area <= (1600 * 1050)){kbit_rate = 2500;}else{kbit_rate = 2800;}kbit_rate = kbit_rate * frame_rate / 25;if (kbit_rate < 80)kbit_rate = 80;return kbit_rate;}public int CalMaxKBitRate(int frame_rate, int w, int h, bool is_var_bitrate){int max_kbit_rate = 2000;int area = w * h;if (area <= (320 * 300)){max_kbit_rate = is_var_bitrate ? 320 : 600;}else if (area <= (360 * 320)){max_kbit_rate = is_var_bitrate ? 400 : 800;}else if (area <= (640 * 360)){max_kbit_rate = is_var_bitrate ? 600 : 1000;}else if (area <= (640 * 480)){max_kbit_rate = is_var_bitrate ? 680 : 1300;}else if (area <= (800 * 600)){max_kbit_rate = is_var_bitrate ? 700 : 1500;}else if (area <= (900 * 700)){max_kbit_rate = is_var_bitrate ? 920 : 2200;}else if (area <= (1280 * 720)){max_kbit_rate = is_var_bitrate ? 1600 : 3000;}else if (area <= (1366 * 768)){max_kbit_rate = is_var_bitrate ? 1700 : 3300;}else if (area <= (1600 * 900)){max_kbit_rate = is_var_bitrate ? 2400 : 3400;}else if (area <= (1600 * 1050)){max_kbit_rate = is_var_bitrate ? 2600 : 3600;}else if (area <= (1920 * 1080)){max_kbit_rate = is_var_bitrate ? 2900 : 3800;}else{max_kbit_rate = is_var_bitrate ? 3500 : 5500;}max_kbit_rate = max_kbit_rate * frame_rate / 25;if (area <= (320 * 240)){if (max_kbit_rate < 150)max_kbit_rate = 150;}else if (area <= (640 * 480)){if (max_kbit_rate < 300)max_kbit_rate = 300;}else if (area <= (1280 * 720)){if (max_kbit_rate < 600)max_kbit_rate = 600;}else if (area <= (1920 * 1080)){if (max_kbit_rate < 960)max_kbit_rate = 960;}else{if (max_kbit_rate < 1500)max_kbit_rate = 1500;}return max_kbit_rate;}public int CalVideoQuality(int w, int h, bool is_h264){int area = w * h;int quality = is_h264 ? 23 : 28;if (area <= (320 * 240)){quality = is_h264 ? 23 : 27;}else if (area <= (640 * 360)){quality = is_h264 ? 25 : 28;}else if (area <= (640 * 480)){quality = is_h264 ? 25 : 28;}else if (area <= (960 * 600)){quality = is_h264 ? 26 : 28;}else if (area <= (1280 * 720)){quality = is_h264 ? 27 : 29;}else if (area <= (1600 * 900)){quality = is_h264 ? 28 : 30;}else if (area <= (1920 * 1080)){quality = is_h264 ? 29 : 31;}else{quality = is_h264 ? 30 : 32;}return quality;}public int CalVideoEncoderSpeed(int w, int h, bool is_h264){if (is_h264)return 3;int area = w * h;if (area <= (960 * 600)){return 3;}else if (area <= (1280 * 720)){return 2;}else{return 1;}}public int GetAudioInputDeviceNumber(){int auido_devices = 0;NTSmartPublisherSDK.NT_PB_GetAuidoInputDeviceNumber(ref auido_devices);return auido_devices;}public List<String> GetAudioInputDeviceName(int auido_devices){List<String> audio_device_name = new List<string>();if (auido_devices > 0){for (int i = 0; i < auido_devices; ++i){byte[] deviceNameBuffer = new byte[512];string name = "";if (NTBaseCodeDefine.NT_ERC_OK == NTSmartPublisherSDK.NT_PB_GetAuidoInputDeviceName((uint)i, deviceNameBuffer, 512)){int count = 0;for (int j = 0; j < deviceNameBuffer.Length; ++j){if (deviceNameBuffer[j] != 0){count++;}else{break;}}if (count > 0){name = Encoding.UTF8.GetString(deviceNameBuffer, 0, count);}}var audio_name = "";if (name.Length == 0){audio_name = "音频采集设备-";}else{audio_name = name + "-";}audio_name = audio_name + (i + 1);audio_device_name.Add(name);}}return audio_device_name;}public bool IsCanCaptureSpeaker(){int is_capture_speader = 0;if (NTBaseCodeDefine.NT_ERC_OK == NTSmartPublisherSDK.NT_PB_IsCanCaptureSpeaker(ref is_capture_speader)){if (1 == is_capture_speader){return true;}}return false;}public bool OpenPublisherHandle(uint video_option, uint audio_option){if (publisher_handle_ != IntPtr.Zero){return true;}publisher_handle_count_ = 0;if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_Open(out publisher_handle_,video_option, audio_option, 0, IntPtr.Zero)){return false;}if (publisher_handle_ != IntPtr.Zero){pb_event_call_back_ = new NT_PB_SDKEventCallBack(PbSDKEventCallBack);NTSmartPublisherSDK.NT_PB_SetEventCallBack(publisher_handle_, IntPtr.Zero, pb_event_call_back_);set_video_preview_image_callback_ = new SetVideoPreviewImageCallBack(VideoPreviewImageCallBack);return true;}else{return false;}}public void PbSDKEventCallBack(IntPtr handle, IntPtr user_data,UInt32 event_id,Int64 param1,Int64 param2,UInt64 param3,UInt64 param4,[MarshalAs(UnmanagedType.LPStr)] String param5,[MarshalAs(UnmanagedType.LPStr)] String param6,IntPtr param7){if (sync_invoke_ != null){System.ComponentModel.ISynchronizeInvoke sync_invoke_target = sync_invoke_.Target as System.ComponentModel.ISynchronizeInvoke;if (sync_invoke_target != null){if (sync_invoke_target.InvokeRequired){sync_invoke_target.BeginInvoke(pb_set_event_call_back_, new object[] { event_id, param1, param2, param3, param4, param5, param6, param7 });}else{pb_set_event_call_back_(event_id, param1, param2, param3, param4, param5, param6, param7);}}}}//预览数据回调public void SDKVideoPreviewImageCallBack(IntPtr handle, IntPtr user_data, IntPtr image){NT_PB_Image pb_image = (NT_PB_Image)Marshal.PtrToStructure(image, typeof(NT_PB_Image));NT_VideoFrame pVideoFrame = new NT_VideoFrame();pVideoFrame.width_  = pb_image.width_;pVideoFrame.height_ = pb_image.height_;pVideoFrame.stride_ = pb_image.stride_[0];Int32 argb_size = pb_image.stride_[0] * pb_image.height_;pVideoFrame.plane_ = Marshal.AllocHGlobal(argb_size);CopyMemory(pVideoFrame.plane_, pb_image.plane_[0], (UInt32)argb_size);if (sync_invoke_ != null){System.ComponentModel.ISynchronizeInvoke sync_invoke_target = sync_invoke_.Target as System.ComponentModel.ISynchronizeInvoke;if (sync_invoke_target != null){if (sync_invoke_target.InvokeRequired){sync_invoke_target.BeginInvoke(set_video_preview_image_callback_, new object[] { pVideoFrame });}else{set_video_preview_image_callback_(pVideoFrame);}}}}public void VideoPreviewImageCallBack(NT_VideoFrame frame){if (cur_image_.plane_ != IntPtr.Zero){Marshal.FreeHGlobal(cur_image_.plane_);cur_image_.plane_ = IntPtr.Zero;}cur_image_ = frame;if ( render_wnd_ != null){render_wnd_.Invalidate();}}public List<CameraInfo> GetCameraInfos(){List<CameraInfo> cameras = new List<CameraInfo>();int device_number = 0;if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_GetVideoCaptureDeviceNumber(ref device_number)){return cameras;}if (device_number < 1){return cameras;}for (int i = 0; i < device_number; ++i){CameraInfo info = new CameraInfo();info.capabilities_ = new List<NT_PB_VideoCaptureCapability>();StringBuilder name = new StringBuilder(256);StringBuilder id = new StringBuilder(1024);if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_GetVideoCaptureDeviceInfo(i,name, 256,id, 1024)){continue;}info.name_ = name.ToString();info.id_ = id.ToString();int capability_number = 0;if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_GetVideoCaptureDeviceCapabilityNumber(id.ToString(), ref capability_number)){continue;}bool is_failed = false;for (int j = 0; j < capability_number; ++j){NT_PB_VideoCaptureCapability capability = new NT_PB_VideoCaptureCapability();if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_GetVideoCaptureDeviceCapability(id.ToString(), j, ref capability)){is_failed = true;break;}info.capabilities_.Add(capability);}if (!is_failed){cameras.Add(info);}}return cameras;}public bool StartPreview(){video_preview_image_callback_ = new NT_PB_SDKVideoPreviewImageCallBack(SDKVideoPreviewImageCallBack);NTSmartPublisherSDK.NT_PB_SetVideoPreviewImageCallBack(publisher_handle_, (int)NTSmartPublisherDefine.NT_PB_E_IMAGE_FORMAT.NT_PB_E_IMAGE_FORMAT_RGB32, IntPtr.Zero, video_preview_image_callback_);if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_StartPreview(publisher_handle_, 0, IntPtr.Zero)){if (0 == publisher_handle_count_){NTSmartPublisherSDK.NT_PB_Close(publisher_handle_);publisher_handle_ = IntPtr.Zero;}return false;}publisher_handle_count_++;is_previewing_ = true;return true;}public void StopPreview(){is_previewing_ = false;publisher_handle_count_--;NTSmartPublisherSDK.NT_PB_StopPreview(publisher_handle_);if (0 == publisher_handle_count_){NTSmartPublisherSDK.NT_PB_Close(publisher_handle_);publisher_handle_ = IntPtr.Zero;}if (render_wnd_ != null){render_wnd_.Invalidate();}}public bool StartPublisher(String url){if (publisher_handle_ == IntPtr.Zero){return false;}if (!String.IsNullOrEmpty(url)){NTSmartPublisherSDK.NT_PB_SetURL(publisher_handle_, url, IntPtr.Zero);}if (NTBaseCodeDefine.NT_ERC_OK != NTSmartPublisherSDK.NT_PB_StartPublisher(publisher_handle_, IntPtr.Zero)){if (0 == publisher_handle_count_){NTSmartPublisherSDK.NT_PB_Close(publisher_handle_);publisher_handle_ = IntPtr.Zero;}is_publishing_ = false;return false;}publisher_handle_count_++;is_publishing_ = true;return true;}public void StopPublisher(){publisher_handle_count_--;NTSmartPublisherSDK.NT_PB_StopPublisher(publisher_handle_);if (0 == publisher_handle_count_){NTSmartPublisherSDK.NT_PB_Close(publisher_handle_);publisher_handle_ = IntPtr.Zero;}is_publishing_ = false;}public void Close(){if (0 == publisher_handle_count_){NTSmartPublisherSDK.NT_PB_Close(publisher_handle_);publisher_handle_ = IntPtr.Zero;}}public bool IsPreviewing(){return is_previewing_;}public bool IsPublishing(){return is_publishing_;}public bool IsPublisherHandleAvailable(){return publisher_handle_ != IntPtr.Zero ? true : false;}public int GetPublisherHandleCount(){return publisher_handle_count_;}public void SetVideoCaptureDeviceBaseParameter(String camera_id, UInt32 width, UInt32 height){NTSmartPublisherSDK.NT_PB_SetVideoCaptureDeviceBaseParameter(publisher_handle_, camera_id, width, height);}public void SetFrameRate(UInt32 frame_rate){NTSmartPublisherSDK.NT_PB_SetFrameRate(publisher_handle_, frame_rate);}public void SetVideoEncoderType(Int32 encode_type){NTSmartPublisherSDK.NT_PB_SetVideoEncoderType(publisher_handle_, encode_type);}public void SetVideoQualityV2(Int32 quality){NTSmartPublisherSDK.NT_PB_SetVideoQualityV2(publisher_handle_, quality);}public void SetVideoMaxBitRate(Int32 kbit_rate){NTSmartPublisherSDK.NT_PB_SetVideoMaxBitRate(publisher_handle_, kbit_rate);}public void SetVideoKeyFrameInterval(Int32 interval){NTSmartPublisherSDK.NT_PB_SetVideoKeyFrameInterval(publisher_handle_, interval);}public void SetVideoEncoderProfile(Int32 profile){NTSmartPublisherSDK.NT_PB_SetVideoEncoderProfile(publisher_handle_, profile);}public void SetVideoEncoderSpeed(Int32 speed){NTSmartPublisherSDK.NT_PB_SetVideoEncoderSpeed(publisher_handle_, speed);}public void SetAuidoInputDeviceId(UInt32 device_id){NTSmartPublisherSDK.NT_PB_SetAuidoInputDeviceId(publisher_handle_, device_id);}public void SetPublisherAudioCodecType(Int32 type){NTSmartPublisherSDK.NT_PB_SetPublisherAudioCodecType(publisher_handle_, type);}public void SetPublisherMute(bool is_mute){NTSmartPublisherSDK.NT_PB_SetMute(publisher_handle_, is_mute ? 1 : 0); }public void SetEchoCancellation(Int32 isCancel, Int32 delay){NTSmartPublisherSDK.NT_PB_SetEchoCancellation(publisher_handle_, isCancel, delay);}public void SetNoiseSuppression(Int32 isNS){NTSmartPublisherSDK.NT_PB_SetNoiseSuppression(publisher_handle_, isNS);}public void SetAGC(Int32 isAGC){NTSmartPublisherSDK.NT_PB_SetAGC(publisher_handle_, isAGC);}public void SetVAD(Int32 isVAD){NTSmartPublisherSDK.NT_PB_SetVAD(publisher_handle_, isVAD);}private void GetRenderRect(int limtWidth, int limtHeight, int image_w, int image_h, ref int left_offset, ref int top_offset, ref int dw, ref int dh){if (limtWidth < 1 || limtHeight < 1){left_offset = 0;top_offset = 0;dw = limtWidth;dh = limtHeight;return;}if (image_w < 1 || image_h < 1){left_offset = 0;top_offset = 0;dw = limtWidth;dh = limtHeight;return;}// 按比例double limit_ratio = limtWidth * 1.0 / limtHeight;double video_ratio = image_w * 1.0 / image_h;if (video_ratio > limit_ratio){dw = limtWidth;dh = (int)(dw * image_h * 1.0 / image_w);if (dh > limtHeight)dh = limtHeight;}else{dh = limtHeight;dw = (int)(dh * image_w * 1.0 / image_h);if (dw > limtWidth)dw = limtWidth;}left_offset = limtWidth / 2 - dw / 2;if (left_offset < 0)left_offset = 0;top_offset = limtHeight / 2 - dh / 2;if (top_offset < 0)top_offset = 0;}private void OnRenderWindowPaint(object sender, PaintEventArgs e){if (render_wnd_.Width < 1 || render_wnd_.Height < 1)return;Graphics g = e.Graphics;Brush brush = new SolidBrush(Color.Black);g.FillRectangle(brush, 0, 0, render_wnd_.Width, render_wnd_.Height);if (is_previewing_ && cur_image_.plane_ != IntPtr.Zero){g.SmoothingMode = SmoothingMode.HighSpeed;int image_width = cur_image_.width_;int image_height = cur_image_.height_;Bitmap bitmap = new Bitmap(image_width, image_height, cur_image_.stride_,System.Drawing.Imaging.PixelFormat.Format32bppRgb, cur_image_.plane_);int d_w = 0, d_h = 0;int left_offset = 0;int top_offset = 0;GetRenderRect(render_wnd_.Width, render_wnd_.Height, image_width, image_height, ref left_offset, ref top_offset, ref d_w, ref d_h);g.DrawImage(bitmap, left_offset, top_offset, d_w, d_h);   //在窗体的画布中绘画出内存中的图像}}}
}

由于RTMP在0缓冲下，延迟在200-400毫秒区间，常规的对延迟不是非常苛刻的场景下，足够用了。

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